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Service Manual 03/2012

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1. SHBEM WD SHEM 5 SHEM 96001 9606 08 9601 09 05 07 7 02 1 1030Jy 30 Jo 1VINOZINOH 98 1970 Adel Sai GAS GILL Gey ees ees ees eee eee ese eee eae ose eam eee 999 sce see oss cl S6LL 484 VSL ZZLL O67 007 8841 9601 LLL v9 CHILL VELL 706 886 7 777 777 777 1777 1777 1777 1777 777 777 VL LOVES 6 CSE 2100 126 2280 25570 222 222 227 OL LZLL 629 479 SOLL 227 ELSL 8801 1861 L9OL ZEZL ECOL 082 260 9001 622 788 6 6 BLL 9 9 7 77 177 777 777 60 0 SS OZ WAL ely sis Gol ass 2 Gaol Mee Mea bes Gee Ast See Ge Bid eee eee eee aes 80 590 ZZS 8041 9201 047 8891 ZOOL 67 897 9 6 GLE 4261 976 842 181 266 602 566 868 L L 808 7 5 77 177 777 777 20 860158 tals Aziz ash tests 21505 5158 04119 ible 0 28 isle Sit aes ass 9I 886 66 V8Zl 096 727 2991 466 G
2. RTD9 65 Step Down Diffuser FD9 65 RTD11 95 Step Down Diffuser FD11 95 cin 2 Ends 1 Side 8 All Ends amp Flush 2Ends 1 Side amp Ends 8 Flush Open 2Ends Open Sides Open Diffuser Open 2 Ends Open Sides Open Diffuser 800 0 15 0 13 0 11 0 11 1000 0 19 0 16 0 14 0 14 1200 0 25 0 20 0 17 0 17 1400 0 33 0 26 0 20 0 20 1600 0 43 0 32 0 20 0 24 1800 0 56 0 40 0 30 0 30 0 13 0 11 0 09 0 09 2000 0 73 0 50 0 36 0 36 0 15 0 13 0 11 0 10 2200 0 95 0 63 0 44 0 44 0 18 0 15 0 12 0 12 2400 0 21 0 18 0 15 0 14 2600 0 24 0 21 0 18 0 17 2800 0 27 0 24 0 21 0 20 3000 0 32 0 29 0 25 0 25 CEILING DIFFUSER AIR THROW DATA Air Volume cfm 1 Effective Throw ft Model No RTD9 65 FD9 65 800 10 17 14 18 1000 10 17 15 20 1200 11 18 16 22 1400 12 19 17 24 1600 12 20 18 25 1800 13 21 20 28 2000 14 23 21 29 2200 16 25 22 30 RTD11 95 FD11 95 2600 24 29 19 24 2800 25 30 20 28 3000 27 33 21 29 1 Effective throw based on terminal velocities of 75 ft per minute Page 20 ELECTRICAL DATA 3 TON 3 TON HIGH EFFICIENCY R 410A LGHO36H4 1 Voltage 60hz 208 230V 1 Ph 208 230V 3 Ph 460V 3 Ph 575V Ph C
3. sBunjes peeds ILON 5 5 5 pue 104 6 eoue sisel eouejsiseJ seuosseooe p Auy Z 038 eeu eouejsiseiJ suondo QQv SLINA TIY 39V ld NI 5 ANV 1109 YOOGNI AINO LINN 3SV8 ADNVLSISAY 540 1 3 18VL LO3IG VLVG 9 goz szi 9222 881 666 59 2 198 566 pc 21 8811 411 9922 190 926 9022 668 902 1601 901 7981 8901 8 8 299 17 77 17 71 1 m LOLL ZOLL 2072 096 2222 SOLL 818 2202 vzor 269 1881 eror 299 0691 ZLOL 1091 286 eve zerr 0L 961 4801 VOLL 666 2222 1201 262 6112 2201 029 2261 voor 679 926 Bey 996 eze 660 177 69
4. eouejsiseJ jonp eouejsiseiJ seuossoooe pay uy Z uonoes jeeu 1 Auy Qav SLINN TTV HOd 39V ld NI 544111 1100 YOOGNI AINO LINN 358 ADNVLSISAY 5 318VL 83MOT18 NOL 1944 VLVG Page 8 126 144 6941 coer vtz year 159 poor 1 1 21 1661 664 981 ogzi 191 2821 698 89 6011 066 698 112 267 175157 777 777 eee 6921 608 szer esz 688 822 489 082 202 785 2291 9911 Lev ezti zee opzi voe zoor or 968 218 9002 020 694 6L6L 089 6681 925 6991 027 vost 9011 ose 688 2201 oez 290 60 108 128 9902 ett 691 926 190 999 988 096 1141 1601 27 600 99 reer 2201 zaz virt
5. snem sneM 96001 9606 9608 9601 9609 9605 0 9606 9602 bas enbJo 6301 10 TWLNOZIYOH ove ezer 666 122 zazi roz 89411 21 6821 688 0002 ezz 982 606 986 erz 418 880 819 008 vzs 0698 dl 216 898 zvoz 188 162 686 682 vtz 048 861 219 LES eest vort 916 eert or 948 6012 620 zez 6002 2021 801 6061 s911 609 1911 vert ger 2181 2601 Lov 2921 0901 voe zorr 60 028 848 9912 6611 481 2502 6911 269 8961 SELL Les 8221 Lott 888 8091 001 886 2091 0101 168 6631 608 848 9812 ezi 282 0802 989 7261 VOLL 825 108 9907 027 6691 6101 Sze 6 082 ozz zo 8411 948 zezz 924 942 9LLL 229 0002 izor vas 968 1201 pov 1291 826 106 79 626 292 692
6. 86 yes e 0 666 468 66 927 80 1901 76 2991 9201 9291 SOOL 29 81 01 886 CLE 692 6 992 6LLL 756 810 1096 866 VAL COL 77 77 777 777 LO vLOL v8v 689L 266 029 0ZGL 126 986 LOE 2021 226 976 COLL 406 206 066 688 291 218 9 0 086 627 907 vI9L 816 666 209 268 882 1961 S98 ZEZ OZZL 868 VEL ESOL 418 98 988 2 8 OIL GLO 648 GL 40 8466 88v 221 806 266 2991 188 926 GEGL 678 222 661 8 8 122 692 982 681 LOLL 292 666 201 018 889 CEL 69 968 77 2081 098 9 6 969 228 LOE 9889 96 892 97 692 602 901 622 LLL OSLL 069 VEL 766 699 86 692 899 69 60 298 028 196 122 282 HES 69 291 L6Ovl LOZ 6 696 699 OGL 900 869 08 870 688 88 108 108 99 20 918 6481 622 OVE 99 291 082 2991 VOL LEZ 268 999 16 419 1441 699 VOL 601 ELS 11 906 897 OG VO 941 666 LOGL VEL 826 9621 269 292 889L 279 Ve S9SL 209 291 9vS 92 662 98 Lev 99 286 276 42 0 SHEM WD SREM W49 WD Idd SHEM WD SHEM
7. 90 SGLL 728 2922 ozi 992 8801 499 9202 9601 896 7981 486 869 2041 see 108 688 voz ooe 468 881 1801 062 izi 262 so ezi 698 zoez osor 792 2212 1901 669 2602 voor 688 296 9221 468 cee Lest zeg 172 oeer 682 141 601 822 698 vo 001 698 1962 8601 191 0122 9101 619 6202 026 SIG 816 926 21 0921 959 oze 198 062 822 2 61 922 991 Belt 999 906 2201 988 2462 2601 622 8626 986 209 8608 vee 267 over 188 666 182 voe 660 6 1 viz 289 98 1411 26 cO 2801 698 6082 voor 9 7 1922 996 686 968 627 696 928 pze zist 144 682 7291 901 9691 669 gizi 096 88 000 10 4201 zeg 926 869 ezz pze 698 698 Lov 2961 108 ese 9ee1 622 9991 109 061 ezv 289 ser 192 108 08 Isro WO 5 snem snem SneM INdY sHEM 96001 9606 9608 9601 09 0S 0 9606 9602 see enbJo 6301 10 08 YBIH 101 jo
8. EXHAUST FAN BLOWER MORTOR MOTOR VARIABLE SPEED ECM MOTORS BLOWER COMP TWO SPEED CONTROL HIGH AND LOW PRESSURE SWITCHES BLOWER DECK CK CONTACTORS AND RELAYS OUTDOOR FAN AREA TRANSFORMER 1 POWER HUMIDITROL HUMIDITROL INTERFACE CONTACTOR COMPRESSOR RELAY HARD START KIT eee Es ETE 5 gt Q 20 D m n r2 VALVE SOLENOID REHEAT COIL 1 SOLENOID TWO STAGE PLUG ECONOMIZER BYPASS PLUG EXHAUST FAN PLUG EXHAUST FAN PLUG BLOWER MOTOR PLUG MOTOR VARIABLE SPEED PLUG ECM MOTORS PLUG BLOWER COMP TWO SPEED CONTRO PLUG HIGH AND LOW PRESSURE SWITCHES PLUG CONTACTORS AND RELAYS P VOLTAGE APPLICATION C5 DENOTES OPTIONAL COMPONENTS LINE VOLTAGE FIELD INSTALLED WIRING DIAGRAM COOLING LCH LGH 036H 048H 060H G J P Y SECTION B REV 4 0 Supersedes New Form No 537177 01 Lennox Commercial LGH036 072 BELT DRIVE J VOLTAGE UNIT DIAGRAM NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED 24 POWER IT MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING TERMINATION AND INSULATION THICKNESS WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES DISCONNECT ALL POWER BEFORE SERVICING MOTOR EXHAUST FAN A169 8 CAPACITOR OUTDOOR FAN 1 55 a CAPACITOR EXHAUST FAN Vous CIRCUIT BREAKER FB
9. 1811 128 9012 290 gez proz 421 199 161 9801 9841 8901 zep 0681 oror ose 0861 5 6 egz 6981 zo 028 99 2 921 624 2502 8601 869 zver esol Les 1811 8001 69 1291 696 zee Lee 192 CUZ 90 oei 218 2022 6601 ozz 1602 8901 ezo 7261 eror 919 181 026 689 986 pze 099 688 eez 992 058 6 166 218 szz 50 SOLL 618 v90L 202 8212 6601 009 6002 226 969 198 066 262 9891 188 60 669 zeg zzz 0061 882 991 1801 oL 108 vo 2401 208 1682 0601 769 99 2 886 186 9202 866 827 948 888 sze cee sez test zzz viz vrer tez 98 8601 989 86 198 962 8962 666 629 6026 676 ess 2902 468 ssp 906 998 166 6021 682 6 2 890 ozz Loz 282 199 18 209 68 226 zo 6101 282 9922 896 699 2222 eze vvs 6 02 298 066 108 eee 182 862 692 1091 929 161 ozvi 019 86 eert ovS 98 8 6 10 686 101 eez 166 veg 1 lt 22 8 8 20611 02 78 viv 966 124 986 208 zoz vsz 929 269 28 089 268 rer gezi er 08 920 WO 5 snem
10. HORIZONTAL Air Volume cfm External Static in w g 0 20 0 30 0 60 0 70 0 9 1 0 RPM RPM BHP 900 483 0 1 554 0 13 627 0 16 699 0 19 765 0 22 826 0 24 882 0 27 935 0 3 986 0 33 1039 0 36 1000 505 0 12 576 0 16 648 0 19 719 0 21 784 0 24 842 0 27 896 0 3 947 0 33 998 0 37 1050 0 4 1100 530 0 15 601 0 18 671 0 21 741 0 24 804 0 27 860 0 3 912 0 34 961 0 37 1010 0 4 1060 0 43 1200 1300 558 588 0 18 0 22 627 0 22 656 0 25 696 0 25 723 0 28 764 788 0 28 0 31 824 0 3 846 0 34 878 0 34 897 0 38 928 0 37 945 0 42 975 0 41 990 0 45 1023 1037 0 44 0 48 1072 0 47 1084 0 51 1400 621 0 25 687 0 29 752 0 32 814 0 35 868 0 38 916 0 42 962 0 46 1006 0 5 1052 0 53 1098 0 56 1500 655 0 29 719 0 33 781 0 36 839 0 39 890 0 43 936 0 47 979 0 51 1023 0 55 1068 0 58 1113 0 61 1600 690 0 33 751 0 37 810 0 4 865 0 44 912 0 48 955 0 52 997 0 56 1041 0 6 1086 0 63
11. 1600 746 0 37 805 0 4 862 0 44 914 0 48 957 0 52 996 0 55 1037 0 59 1081 0 62 1126 0 64 1167 0 68 1700 784 0 42 840 0 45 893 0 49 940 0 53 980 0 57 1019 0 61 1060 0 64 1104 0 67 1147 0 7 1187 0 74 1800 821 0 47 874 0 51 923 0 55 967 0 59 1006 0 63 1044 0 67 1085 0 7 1128 0 73 1170 0 77 1208 0 82 1900 857 0 53 906 952 0 62 994 0 66 1032 0 7 1071 0 73 1112 0 76 1154 0 8 1194 0 85 1230 0 9 Air Volume cfm External Static in w g 1 5 1 6 1 8 1 9 2 0 RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 900 1000 1124 0 43 1168 1197 0 45 1209 0 49 1247 0 52 1275 1285 0 51 0 55 1312 0 54 1322 0 58 1358 0 61 1387 0 59 1395 0 64 1424 1432 0 62 0 67 1470 0 7 1100 1134 0 47 1178 1219 0 53 1258 0 56 1295 0 6 1331 0 63 1367 0 66 1403 0 69 1439 0 72 1477 0 75 1200 1146 0 51 1189 1230 0 58 1268 0 61 1305 0 65 1341 0 68 1376 0 71 1411 0 74 1447 0 77 1485 0 81 1300 1159 0 55 1201 0 59 1241 0 63 1279 0 66 1315 0 7 1351 0 73 1386 0 77
12. LENNOX Service Literature UNIT INFORMATION LGH SERIES Corp 0924 L11 Revised 3 2012 7 to 21 kW LGH036 through 072 6 048H and 060H are high efficiency gas pack aged units equipped with direct drive blowers 65 0485 and 0605 are standard efficiency gas packaged units equipped with two speed belt drive blowers LGHO072H is a high efficiency gas packaged unit equipped with a single speed belt drive blower LGHO036 S amp units are available in 65 000 to 105 000 Btuh 19 to 31 KW heating inputs LGHO048 060 072 units are available in 65 000 to 150 000 Btuh 19 to 43 9 kW heating inputs Gas heat sections are designed with Lennox alumi nized stainless optional steel tube heat exchangers Cool ing capacities range from 3 to 6 tons 7 to 21kW Information contained in this manual is intended for use by qualified service technicians only All specifications are sub ject to change Procedures outlined in this manual are pre sented as a recommendation only and do not supersede or replace local or state codes If the unit must be lifted for service rig unit by attaching four cables to the holes located in the unit base rail two holes at each oorner Refer to the installation instructions for the proper rigging technique AWARNING Improper installation adjustment alteration service maintenance cause property damage person al injury or loss of life Install
13. Low Temperature Vestibule Heater 208 230V 1 or ETLTVH10A 1Y 54W23 OX OX OX OX 460V 3ph E1LTVH10A 1G 54W24 OX OX OX 575V 3ph E1LTVH10A 1J 54W25 OX OX OX LPG Propane For one stage models C1PROP10AP1 53W69 X X X X Conversion Kits For two stage models CIPROP20AP1 53W70 X X X Stainless Steel Heat Exchanger Factory Vertical Vent Extension C1EXTN20FF1 31W62 BLOWER SUPPLY AIR Motors Direct Drive 0 50 hp Factory Direct Drive 0 75 Factory Direct Drive 1 Factory Belt Drive 0 75 hp 2 Speed Factory Belt Drive 1 hp 2 Speed Factory Belt Drive 2 hp 2 Speed Factory Belt Drive 1 hp Standard Efficiency Factory Belt Drive 2 hp Standard Efficiency Factory Belt Drive 1 hp High Efficiency Factory Belt Drive 2 hp High Efficiency Drive Kits Kit A01 T1DRKT001 1 673 1010 rpm Factory See Blower Data Tables for selection Kit A02 TIDRKTOO2 1 745 1117 rpm Factory Kit A03 T1DRKT003 1 833 1250 rpm Factory Kit A05 T1DRKTO05 1 897 1346 rpm Factory Kit A06 T1DRKTO06 1 1071 1429 rpm Factory Kit A07 007 1 1212 1548 rpm Factory Kit AA01 TIDRKTOO1AP1 522 784 rpm Factory Kit AA02 2 1 632 875 rpm Factory Kit 1 1 798 1105 rpm Factory Blower Belt Auto Tensioner Factory CABINET Coil Guards T1GARD20A 1 17W87
14. 2 HACR type breaker or fuse 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 24 LGH PARTS ARRANGEMENT EVAPORATOR HUMIDITROL FILTERS 4 COIL COIL pital 036 048 16 X 20 X 2 OPTIONAL DIRECT DRIVE SHOWN CONDENSER 060 072 20 X 20 X 2 FAN ECONOMIZER OPTIONAL Ws SN vt See COIL GUARDS OPTIONAL Et Se hs Ss Se SS Ns 55 WSS SURES NN S Ss SSS XX NN SSS CONDENSER COIL CONDENSATE DRAIN COMBUSTION AIRINDUCER BURNERS GAS VALVE UNIT CONTROLLER COMPRESSOR FIGURE 1 LGH CONTROL BOX FIGURE 2 Page 25 I UNIT COMPONENTS All 3 through 6 ton 7 through 21 kW units are configure to order units CTO The LGH unit components are shown in figure 1 All units come standard with removable unit panels All L1 L2 and L3 wiring is color coded L1 is red L2 is yellow and L3 is blue A Control Box Components LGH control box components are shown in figure 2 The control box is located in the upper right portion of the com pressor compartment 1 Control Transformer T1 All use a single line voltage to 24VAC transformer mounted in the control box Transformer supplies power to control circuits in the unit The transformer is rated at and is protected by a 3 5 amp circuit breaker CB8 The 208 230 Y voltage tr
15. be removed for service without removing any part of the burners During ignition spark travels through the spark electrode fig ure 13 and ignites the right burner Flame travels from burner to burner until all are lit The spark electrode is connected to the ignition control by a 8 mm silicone insulated stranded high voltage wire The wire uses 1 4 6 35 mm female quick connect on both ends of the wire NOTE If electrode wire must be replaced wire and suppression must be same type cable See Lennox Repair Part Handbook for replacement Page 36 The spark electrode assembly can be removed for inspection by removing the screw securing the electrode assembly and sliding it out of unit For proper unit operation electrodes must be positioned and gapped correctly Spark gap may be checked with appropriately sized twist drills or feeler gauges Disconnect power to the unit and remove electrode assembly The gap should be between 0 125 0 015 3 2 mm 4 mm See figure 13 AIMPORTANT In order to maximize spark energy to electrode high voltage wire should touch unit cabinet as little as possible IGNITOR SPARK GAP SHOULD BE 1 8 3mm 5 es 2 FIGURE 13 10 Sensor Figure 14 A flame sensor is located under the left most side burner The sensor is mounted through a hole in the burner support and the tip protrudes into the flame envelope of the left most bumer The sensor assembly i
16. 1 0 fi efm RPM BHP 1100 529 05117 10 21 653 0 24 724 0 26 810 0 26 886 0 26 942 0 28 982 0 32 1022 0 36 1064 0 40 1200 553 0 20 615 0 24 677 0 27 747 0 30 829 0 30 902 0 30 955 0 33 994 0 36 1034 0 40 1075 0 44 1300 579 0 23 640 0 27 701 0 31 770 0 33 850 0 34 918 0 35 969 0 37 1007 0 41 1047 0 45 1088 0 49 1400 1500 609 658 0 27 0 28 669 715 0 31 0 32 729 771 0 34 0 36 796 832 0 37 0 39 871 898 0 38 0 41 936 955 0 39 0 43 983 999 0 41 0 46 1022 1037 0 45 0 50 1061 1077 0 49 0 54 1102 1117 0 53 0 58 1600 720 0 28 769 0 33 819 0 37 871 0 41 926 0 44 975 0 47 1016 0 51 1054 0 55 1093 0 60 1133 0 63 1700 779 0 30 822 0 35 864 0 39 908 0 44 953 0 48 995 0 52 1034 0 57 1072 0 61 1111 0 65 1150 0 69 1800 828 0 34 864 0 39 901 0 43 938 0 48 977 0 53 1015 0 58 1053 0 63 1091 0 67 1130 0 71 1169 0 75 1900 857 0 41 892 0 45 927 0 50 962 0 55
17. 1421 0 8 1457 0 83 1495 0 87 1400 1173 0 61 1214 0 64 1253 0 68 1290 0 72 1327 0 75 1362 0 79 1397 0 82 1432 0 86 1468 0 89 1506 0 93 1500 1189 0 66 1228 0 7 1266 0 74 1303 0 78 1339 0 81 1374 0 85 1409 0 89 1445 0 92 1481 0 96 1519 1 1600 1206 0 72 1244 0 76 1281 0 8 1317 0 84 1353 0 88 1388 0 92 1423 0 96 1459 1 1496 1 04 1535 1 08 1700 1224 0 79 1261 0 83 1298 0 87 1334 0 91 1369 0 95 1404 0 99 1440 1 03 1476 1 07 1513 11 512 1552 1 16 1800 1244 0 86 1280 0 91 1316 0 95 1352 0 99 1387 1 03 1422 1 07 1457 1 11 1494 1 16 1532 1570 1 24 1900 1265 0 95 1301 1 1336 1371 1 08 1406 1 12 1441 1 16 1477 1515 1 24 1553 1 29 1592 1 33 13 BLOWER DATA BELT DRIVE 4 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FORALL UNITS ADD 1 Any factory installed options air resistance heat section economizer etc 2 Any field installed accessories air resistance duct resistance diffuser etc See page 19 for blower motors and drives and wet coil and options accessory air resistance data
18. 1579 15 BLOWER DATA BELT DRIVE 5 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FORALL UNITS ADD 1 Any factory installed options air resistance heat section economizer etc 2 Any field installed accessories air resistance duct resistance diffuser etc See page 19 for blower motors and drives and wet coil and options accessory air resistance data HORIZONTAL External Static in w g Volume 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 9 1 0 RPM BHP RPM BHP RPM BHP RPM BHP RPM RPM RPM BHP RPM BHP 1100 503 0 14 569 0 17 636 0 20 703 0 23 769 0 26 842 0 28 909 0 30 964 0 33 1008 0 36 1049 0 40 1200 525 0 16 590 0 20 657 0 23 722 0 26 787 0 29 857 0 31 921 0 34 974 0 37 1016 0 40 1056 0 43 1300 548 0 19 613 0 23 679 0 26 743 0 29 806 0 32 873 0 35 934 0 37 984 0 41 1026 0 44 1065 0 47 1400 574 0 22 638 0 26 702 0 30 765 0 33 827 0 36 891 0 39 949 0 41 996 0 45 1037 0 48 1076 0 51 1500 609 0 25 671 0 29 733 0 33 793 0 36 851 0 39 911 0 42 965 0 46 1010 0 49 1049 0 53 1088 0 56
19. 968 9162 oror 991 9212 996 619 666 126 zer 0181 928 066 688 028 682 996 90 0704 6201 2872 880 928 zvez 486 oez zez 966 109 0202 988 ezp 2781 868 pze 9291 062 5 2 orti psz 86 v60L 812 izi 642 so osor 600 8082 900 198 6962 296 erz 9122 6 989 1902 198 09 698 vos 096 809 272 092 289 soz 981 299 678 66 9292 lt 96 778 7862 zee 969 6622 288 898 5902 888 0681 022 sve 2891 611 892 vert 699 6 202 909 zor oze 6001 626 6982 696 228 50 2 016 929 0922 198 evs 8808 262 609 916 Sez oee 9141 829 968 orst vio 69 660 099 v6 066 zo 186 696 0 52 96 808 9272 688 2882 eza es orz voz zop 2261 zoz 816 109 ezz 898 896 68 soet ver 98 1901 vo 596 976 esz 616 262 198 869 8622 962 ers 9212 oez 886 029 ooe 992 019 ziz 9291 pze eser 64 0 SneM waa jsem ut 96001 9606 9608 9601 9609 9606 960 9606 9602 bins enbJo 103o N 6301
20. Outdoor fan relay K10 is an optional DPDT relay with a 24VAC coil K10 energizes condenser fan B4 12 Gas Relay K72 two stage units Relay K72 is normally closed and controls combustion air inducer B6 K72 switches the inducer B6 to high speed in response to two stage heat demand Page 26 LINE VOLTAGE IN _f TRIP JA TELEMECANIQUE OVERLOAD RELAY INDICATION CLEAR WINDOW COVER DETAIL SHOWING RESET BUTTON SHOWN ADJUSTED TO MANUAL POSITION CLOSED AMP SETTING POINTER STOP w BUTTON 252 Lift clear cover and turn adjustment screw counterclockwise Reset screw will pop out when pointer is in M manual position Close cover to lock reset screw into position TESTI CONTROL BLUE DIAL S BUTTON Push To Test LOAD VOLTAGE OUT BLUE RESET SCREW Shown in AUTO position as shipped from the factory Lift clear cover to adjust relay amp setting according to value given on the blower motor nameplate Proper relay amp setting equals motor nameplate FLA above and to test the control Control must be in the manual reset mode to perform a test Use a pointed object to press the small Cover must also be lifted to adjust control mode from automatic reset to manual reset see detail red test button A yellow marker should appear in the trip indicati
21. TABLE 28 E Outdoor air is suitable for free cooling when TEMP offset TEMP setpoint ENTH differentia ODE TEMP GLOBAL Outdoor air temperature RT17 is less than return air temperature RT16 minus the offset value 0 to 40 F TEMP Outdoor air temperature RT17 is less than the setpoint value 41 to 70 F Outdoor air enthalpy 7 is less than return air enthalpy A62 Enthalpy setpoint potentiometer is to DIFF ENTH setpoint Outdoor air enthalpy A7 is less than enthalpy setpoint potentiometer position A B C or D LO Global input is energized by P297 9 This setting is also used for outdoor air damper applications Global input G also brings on the blower This mode is NOT used when OAS signal is provided via network connection GLO is only used when a 24VAC signal is used to energize the P297 9 GLO input Enthalpy includes effects of both temperature and humidity Outdoor Air Suitability LED A yellow LED which is labeled OAS provides economizer status A steady yellow LED indicates that outdoor air is suitable for free cooling A flashing yellow OAS light indi cates the IAQ sensor requires outdoor air A flashing yel low LED can also mean that the economizer dampers are open to bring in fresh air while a compressor is on If the economizer is already operating a flashing yellow OAS light indicates the IAQ sensor requires more outdoor air than is suitable for free cooling See fig
22. 1129 0 66 1700 725 0 38 784 10 41 839 0 45 891 0 49 935 0 53 975 0 58 1017 0 62 1060 0 65 1104 0 68 1147 0 72 1800 761 0 42 816 0 46 868 0 5 916 0 55 957 0 59 997 0 64 1038 0 68 1081 0 71 1124 0 74 1165 0 79 1900 795 0 48 848 897 0 56 942 0 61 981 0 66 1020 0 7 1060 0 74 1103 0 77 1145 0 81 1183 0 85 Air Volume cfm External Static in w g 1 5 1 6 1 8 1 9 2 0 RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 900 1000 1101 0 43 1149 1190 0 5 1220 1229 0 49 0 53 1257 0 53 1266 0 57 1293 0 56 1302 0 6 1338 0 63 1364 0 62 1373 0 66 1400 1408 0 65 0 7 1435 0 69 1444 0 73 1100 1110 0 46 1156 1199 0 54 1238 0 57 1275 0 61 1311 0 64 1346 0 67 1381 0 71 1416 0 74 1452 0 78 1200 1119 0 5 1165 1207 0 58 1247 0 62 1284 0 65 1319 0 69 1355 0 72 1389 0 75 1425 0 79 1460 0 82 1300 1130 0 55 1175 0 59 1216 0 63 1255 0 66 1292 0 7 1328 0 74 1363 0 77 1398 0 8 1433 0 84 1469 0 87 1400 1143 0 6 1186 0 63 1226 0 67 1265 0 7 1302 0
23. 1227 0 63 1264 0 66 1296 0 70 1329 0 74 1363 0 77 1397 0 81 1430 1500 1157 0 62 1199 0 65 1239 0 68 1275 0 71 1306 0 75 1339 0 79 1373 0 83 1406 0 87 1440 1600 1700 1173 1190 0 67 0 72 1214 1230 0 70 0 76 1253 1268 0 73 0 79 1288 1301 0 77 0 83 1318 1331 0 81 0 87 1351 1363 0 85 0 92 1384 1396 0 89 0 95 1417 1429 0 93 0 99 1451 1462 1800 1208 0 78 1247 0 82 1285 0 86 1317 0 90 1345 0 94 1377 0 98 1410 1 02 1442 1 06 1475 1900 1227 0 85 1267 0 88 1303 0 92 1333 0 97 1360 1 02 1392 1 06 1424 1 10 1457 1 14 1489 2000 1248 0 92 1286 0 96 1321 1 00 1350 1 05 1377 1 10 1409 1 14 1441 1 18 1473 1 22 1505 2100 1269 1 00 1306 1 04 1339 1 09 1367 1 14 1395 1 19 1426 1 23 1458 1 27 1490 1 31 1522 2200 1290 1 09 1324 1 14 1356 1 19 1385 1 24 1413 1 28 1444 1 32 1476 1 36 1508 1 41 1540 2300 1310 1 20 1343 1 26 1374 1 30 14031 1 34 1432 1 38 1464 1 42 1495 1 46 1527 1 51 1559 2400 1332 1 31 1364 1 37 1394 1 41 1423 1 45 1453 1 48 1484 1 53 1516 1 57 1547 1 61
24. T1GARD20N 1 17W88 X X Hail Guards T1GARD10A 1 17W89 X X T1GARD10N 1 17W90 X X Corrosion Protection indoor coil outdoor coil Factory NOTE Catalog and model numbers shown are for ordering field installed accessories OX Configure To Order Factory Installed or Fileld Installed O Configure To Order Factory Installed X Field Installed Page 2 OPTIONS ACCESSORIES Model Catalog Unit Model No tem Number Number 036 048 060 072 CONTROLS Blower Proving Switch C1SNSR35FF1 53 65 OX OX OX Commercial Controls CPC Einstein Integration Factory Prodigy Control System BACnet Module COCTRL60AE1L 59W51 OX OX OX OX Prodigy Control System LonTalk Module COCTRL65FF1 54W27 OX OX OX Novar 5021 EOCTRL30A1 64W72 OX OX OX OX Novar LSE Factory L Connection Building Automation System X X X X Dirty Filter Switch E1SNSR55AP1 53W66 OX OX OX OX Fresh Air Tempering C1SNSR75AD1 58W63 OX OX OX Smoke Detector Supply or Return Power board and one sensor C1SNSRA4AP1 53W78 OX OX OX OX Smoke Detector Supply and Return Power board and two sensors C1SNSRA3AP1 53W79 OX OX OX OX ELECTRICAL Voltage 208 230V 1 phase Factory 60 hz 208 230V phase Factory 460V 3 phase Factory 575V 3 phase Factory HACR Circuit Breakers Factory Disconnect Switch 80 amp T1DISCO80AH1 20W23 80 amp T1DISCO80NH1 20W
25. 653 0 99 682 712 1 06 741 1 09 769 1 13 796 823 1 22 849 873 1 32 2800 645 1 02 673 1 05 701 730 1 12 758 1 16 785 12 812 838 1 29 862 886 1 39 2900 665 1 09 693 1 12 721 748 1 19 775 1 23 802 1 27 External Static in w g 827 852 1 36 877 900 1 46 Volume 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 cfm RPM BHP BHP RPM BHP BHP BHP BHP RPM BHP RPM BHP BHP RPM BHP 1900 819 0 9 846 0 94 871 0 98 897 1 02 922 1 05 948 1 09 974 1 13 999 1 18 1025 1 23 1050 1 28 2000 826 0 95 852 0 99 877 1 03 902 1 06 928 1 1 953 1 14 979 1 18 1004 1 23 1029 1 28 1054 1 34 2100 834 1 859 960 1 2 985 1 24 1010 1 29 1034 1 35 1058 1 4 2200 842 1 05 868 967 1 26 992 1 3 1016 1 36 1040 1 41 1063 1 47 2300 852 1 11 877 975 1 32 999 1 37 1023 1 42 1046 1 48 1069 1 54 2400 862 1 17 887 983 1 39 1007 1 44 1030 1 5 1053 1 56 1075 1 62 2500 873 1 23 897 992 1 46 1016 1 52 1038 1 58 1060 1 64 1082 1 7 2600 885 1 3 909 1 34 932 1 39 955 1 43 979 1 49 1002 1 54 1025 1 6 1047 1 66 1069 1 73 1090 1 79 2700 897 1 37 920 1 41 944 1 4
26. 9LLL 20L vorz 1801 eze 9622 9901 222 serz 110 599 oser 226 966 192 276 erst 806 816 80 8801 2901 vso 206 pzez ozor esz 99 2 996 869 226 676 6841 606 609 098 298 962 oeer 10 7901 6601 9082 840 288 666 Lez rerz 676 919 2102 606 LOS 268 898 vee 668 168 982 sser 90 oror 610 8292 200 198 ezez 96 602 4122 oze 468 6608 948 989 0981 228 9 2591 822 198 vrti vez 66 689 218 60 2201 866 6982 826 6662 eee 989 688 775 990z sve 9881 962 706 699 192 888 669 98 999 601 698 566 926 9992 876 218 2172 006 099 6922 188 986 7 8 116 992 Sve 2021 969 eez 267 279 691 pizi 265 001 066 60 196 696 2992 126 962 gerz 848 099 6822 928 zes Lez ver svet vez zee 899 622 9291 866 091 898 eze 16 0 0 296 166 2092 868 922 9592 eve 029 6022 962 919 091 1861 929 1821 019 orz 0891 ert 986 927 98 zor vo 226 668 8652 248 9 2 228 669 ezez
27. Unit Controller When 547 senses flame rollout indicating a blockage in the combustion air passages the flame rollout limit trips and the Unit Controller immediately closes the gas valve Limit S47 is factory preset to open at 340 F 16 F ona temperature rise on all units All flame rollout limits are manu al reset 5 Combustion Air Prove Switch 518 Prove switch S18 is a SPST N O switch located to the right of the induced draft assembly S18 monitors combustion air in ducer operation Switch S18 is wired to the ignition control A3 The switch closes at negative 0 10 W C 0 05 24 8 12 4 Pa on pressure fall This negative pressure fall and switch actuation allows the ignition sequence to continue proves by closing that the combustion air inducer is oper ating before allowing the gas valve to open The combus tion air prove switch is factory set and not adjustable 6 Combustion Air Inducer B6 Combustion air inducers provide air to the corresponding burners while clearing the combustion chamber of exhaust gases The inducer begins operating immediately upon re ceiving a thermostat demand and is de energized when thermostat demand is satisfied The inducer uses a 208 230V single phase PSC motor and a 5 24 in x 96in blower wheel All motors operate at 3300RPM and are equipped with auto reset overload protection Two speed units have reduced RPM for low speed Inducers are supplied by various manufacturers Ra
28. 1600 654 0 28 712 0 32 769 0 36 825 0 39 879 0 43 933 0 47 982 0 50 1024 0 54 1063 0 58 1101 0 61 1700 703 0 31 756 0 35 807 0 39 858 0 43 906 0 47 955 0 51 999 0 55 1039 0 59 1078 0 63 1117 0 66 1800 752 0 34 798 0 38 844 0 43 889 0 48 933 0 52 977 0 57 1017 0 61 1056 0 65 1094 0 68 1133 0 72 1900 796 0 38 837 0 43 878 0 48 918 0 53 958 0 58 997 0 62 1036 0 67 1074 0 71 1112 0 74 1151 0 77 2000 833 0 43 870 0 48 907 0 54 943 0 59 980 0 64 1018 0 69 1055 0 73 1093 0 77 1131 0 80 1170 0 83 2100 864 0 50 897 0 55 931 0 60 966 0 65 1002 0 71 1038 0 76 1075 0 80 1113 0 83 1151 0 87 1189 0 90 2200 887 0 57 920 0 62 953 0 67 988 0 73 1024 0 78 1060 0 83 1097 0 87 1135 0 90 1173 0 94 1210 0 98 2300 909 0 64 942 0 70 976 0 75 1011 0 81 1046 0 86 1083 0 91 1120 0 95 1157 0 98 1195 1 02 1231 1 06 2400 931 0 72 965 0 78 999 0 83 1035 0 89 1071 0 94 1108 0 99 1144 1 03 1181 1 07 1217 1 10 1252 1 15 External Static in w g Volume 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 1100 1439 0 69 1200 1443 0 74 1300 1447 0 79
29. 79 669 79 2 901 166 5002 vro 962 908 295 ooz 2091 vos LL 196 9 28 0 WD snem snem snem INdY But 96001 9606 9608 9601 9609 9606 9606 9602 22 enbJo 101041 6301 JO TWLNOZIYOH oez pert 0622 202 796 2212 841 998 986 171 21 808 1262 220 126 tziz 068 2202 BOLL 869 8881 6 01 998 6629 155 17517771 pec LL 9811 6601 2922 6 996 1128 118 6902 820 299 1281 9901 ess 2291 620 LOL vse 0L L9LL v80L egez 1011 276 4628 7601 108 osoz esor 699 zoer zLOL 866 vtzi 886 299 796 zee MZE 60 SELL 1901 COLL 526 8922 7901 282 zziz vzor 689 veer vzs 9911 296 ezv vosi oze rze rozi 80 1111 ssor serz 8401 806 lt 622 01 192 512 666 569 9961 ps6 605 922 146 90 268 898 eoe 661 10 6601 SOL 9 2 vso
30. 900 1105 0 39 1150 0 42 1192 0 45 1232 0 47 1270 0 5 1307 0 53 1345 0 56 1382 0 59 1420 0 62 1000 1117 0 42 1162 0 45 1203 0 48 1242 0 51 1279 0 54 1316 0 57 1353 0 6 1390 0 63 1427 0 66 1465 QT 1100 1126 0 46 1171 0 49 1212 0 52 1251 0 56 1288 0 59 1325 0 62 1361 0 65 1397 0 68 1433 0 71 1470 0 75 1200 1137 0 5 1180 0 54 1222 0 57 1260 0 6 1298 0 64 1334 0 67 1369 0 7 1404 0 73 1440 0 77 1477 0 8 1300 1149 0 55 1191 0 58 1232 0 62 1270 0 65 1307 0 69 1343 0 72 1378 0 76 1413 0 79 1449 0 82 1486 0 86 1400 1163 0 6 1204 0 63 1243 0 67 1281 0 71 1317 0 74 1353 0 78 1388 0 82 1423 0 85 1459 0 89 1496 0 92 Page 11 BLOWER DATA BELT DRIVE 3 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FORALL UNITS ADD 1 Any factory installed options air resistance heat section economizer etc 2 Any field installed accessories air resistance duct resistance diffuser etc See page 19 for blower motors and drives and wet coil and options accessory air resistance data HORIZONTAL External S
31. DENOTES OPTIONAL COMPONENTS LINE VOLTAGE FIELD INSTALLED CB10 WIRING DIAGRAM USED INSTEAD OF S48 COOLING LCH LGH 036S 0485 0605 072H G J M Y ns SECTION B Supersedes New Form No 537178 01 Lennox Commercial A ONLY IN UNITS WITH HUMIDITROL OR PHASE DETECTION OPTION Page 55 LGH036 072 G J P M amp Y Voltage Sequence of Operation Power 1 Line voltage from unit disconnect energizes transformer T1 T1 provides 24VAC power to the A55 Unit Control ler A55 provides 24VAC to the unit cooling heating and blower controls Line voltage from unit disconnect provides voltage to compressor crankcase heaters HR1 through discharge line thermostat and compressor contactor K1 A Belt Drive Units Voltage is distributed to blower motor contactors K3 single amp two speed systems and K37 two speed systems and condenser fan relay K10 B Direct Drive Units Voltage is distributed directly to blower motor B3 and outdoor fan motor B4 Blower Operation The A55 Unit Controller receives a demand from thermostat terminal G A55 energizes blower motor circuit follows 3 Belt Drive A Single Speed Systems 6 ton units A55 energizes blower contactor K3 with 24VAC N O contacts K3 1 close energizing blower B3 B Two Speed Systems 3 4 and 5 ton units A55 through motor control board A169 energizes blower low speed contactor K3 with 24VAC N O contacts K3 1 close energizing blower B3 on low speed defa
32. FD11 95S 13K56 X Transitions Supply and Return Order one T1TRAN10AN1 17W53 X X X T1TRAN20N 1 17W54 X Sunsource Commercial Energy System Solar Power Entry with Disconnect Factory Envoy Communications Gateway with Communications Booster internal Y4263 X X Line Communication Filter external COMSD X X X X Transformer E1TRFM10AD1Y 230 Delta 80W91 X X X X E1TRFM10AD1G 460 VAC Delta 80W92 E1TRFM15AD1G 460 Wye 80W93 X Lamps operate on 110 230V single phase power supply Step down transformer may be ordered separately for 460 and 575V units Alternately 110V power supply may be used to directly power the UVC ballast s 2 575V transformer is not available and must be field provided NOTE Catalog and model numbers shown are for ordering field installed accessories OX Configure To Order Factory Installed or Fileld Installed O Configure To Order Factory Installed X Field Installed Page 4 SPECIFICATIONS DIRECT DRIVE General Data Nominal Tonnage 3 Ton 4 5 Ton Model Number LGH036H4E LGH048H4E LGHO60H4E Efficiency Type High High High Blower Type Multi Speed Multi Speed Multi Speed Direct Drive Direct Drive Direct Drive Cooling Gross Cooling Capacity Btuh 35 800 50 100 61 600 Performance 1 Net Cooling Capacity Btuh 35 200 49 000 60 000 AHRI Rated Air F
33. FREEZESTAT LOCATION EVAPORATOR COIL CONDENSER COIL CONTROL AND COMPONENTS SECTION EXPANSION VALVE RETURN AIR 3 INDOOR BLOWER SECTION SECTION 1 1 PROCESS TUBE used for charging COMPRESSOR HEAT SECTION A rm d o 060 072 C Blower Compartment LGH036H 048H and 060H units are equipped with direct drive blowers LGHO36S 0485 and 0605 units are equipped with two speed belt drive blowers LGHO72H units are equipped with a single speed belt drive blower See unit nameplate for blower type The blower compart ment in all 036 072 units is located between evapo rator coil and the compressor compartment 1 Blower Wheels See table 2 for blower wheel type and size TABLE 2 BLOWER WHEELS LGH Unit Size in mm 0365 0485 0605 Belt 10 X 10 254 X 254 B 036H 048H 060H 11 X 10 279 X 254 0728 15 X 9 381 X 229 2 Indoor Blower Motor B3 All direct drive blower motors are electronically commu tated brushless DC motors Belt drive blower motors are single 6 ton or two speed 3 4 5 ton integral motors Low speed is approximately 2 3 of high speed CFM adjust ments on belt drive units are made by adjusting the motor pulley sheave CFM adjustments on direct drive units are made by changing ECTO parame
34. JO 9668 YBIH 9696 1 enb1o3 jo peeds ILON eouejsisai josseooe suondo pue 6 ees eouejsisei onp eouejsiseJ Auy Z 1 2 uoroes eeu suondo QQv SLINA TIY HO3 39V ld NI SHAM 1109 HLIM AINO LINN 3SV8 AONVLSISAY SAGNTONI 3 18VL H3MO 18 NOL S 19344 VLVG 10 BLOWER DATA BELT DRIVE 3 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FORALL UNITS ADD 1 Any factory installed options air resistance heat section economizer etc 2 Any field installed accessories air resistance duct resistance diffuser etc See page 19 for blower motors and drives and wet coil and options accessory air resistance data DOWNFLOW Air Volume cfm External Static in w g 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 9 1 0 RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 700 453 0 07 523 0 11 596 0 14 679 osim 762 0 18 828 0 21
35. Start Up Operation Page 37 Electric shock hazard Can cause injury IV Charging Page 39 or death Before attempting to perform V System Service Checks Page 42 any service or maintenance turn the electrical power to unit OFF at discon VI Maintenance Page 44 nect switch es Unit may have multiple Vil Accessories Page 46 power supplies VIII Diagrams 54 Technical Page 1 2012 Lennox Industries Inc Publications OPTIONS ACCESSORIES Model Catalog Unit Model No tem Number Number 036 048 060 072 COOLING SYSTEM Condensate Drain Trap PVC C1TRAP20AD2 76W26 OX OX OX Copper CTTRAP10AD2 76W27 OX OX OX OX Drain Pan Overflow Switch E1SNSR71AD1 68W88 OX OX OX OX Efficiency Standard Factory High Factory Service valves not for Humiditrol equipped units Factory HEATING SYSTEM Bottom Gas Piping Kit T1GPKTO1AN1 19W50 OX OX OX OX Combustion Air Intake Extensions T1EXTN10AN1 19W51 X X X X Gas Heat Input Standard One Stage 65 kBtuh input Factory Medium One Stage 105 kBtuh input Factory Medium Two Stage 73 5 105 kBtuh input Factory High Two Stage 105 150 kBtuh input Factory High One Stage 150 kBtuh input Factory
36. When unit is properly charged discharge line pres sures should approximate those in tables 11 through 24 Page 43 VI MAINTENANCE The unit should be inspected once a year by a qualified ser vice technician Electric shock hazard cause injury or death Before attempting to perform any service or maintenance turn the electrical power to unit OFF at disconnect switch es Unit may have multiple power supplies ACAUTION Label all wires prior to disconnection when servicing controls Wiring errors can cause improper and dan gerous operation Verify proper operation after ser vicing AWARNING Product contains fiberglass wool Disturbing the insulation in this product during installation maintenance or repair will expose you to fiberglass wool Breathing this may cause lung cancer Fiberglass wool is known to the State of Cali fornia to cause cancer Fiberglass wool may also cause respiratory skin and eye irritation To reduce exposure to this substance or for further information consult material safety data sheets available from address shown on unit nameplate or contact your supervisor A Filters Units are equipped with temporary filters which must be replaced prior to building occupation See table 27 for correct filter size Refer to local codes or appropriate ju risdiction for approved filters TABLE 27 Unit Qty Filter Size inches mm 036 048 4 16 X20 X2 406 X 508 X 51
37. With 1 0 33 HP 35 40 15 20 15 15 Protection Power Exhaust 3 Minimum Unit Only 23 27 11 13 9 10 Circuit With 1 0 33 HP 25 29 12 14 10 11 Ampacity Power Exhaust 1 Extremes of operating range are plus and minus 10 of line voltage 2 HACR type breaker or fuse 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 22 ELECTRICAL DATA 5 TON 5 TON HIGH EFFICIENCY R 410A LGHO60H4 1 Voltage 60hz 208 230V 1 Ph 208 230V 3 Ph 460V 3 Ph 575V 3 Ph Compressor Rated Load Amps 25 6 17 6 9 7 4 Locked Rotor Amps 118 135 62 50 Outdoor Fan Full Load Amps 4 1 4 1 2 1 1 6 Motor Power Exhaust Full Load Amps 2 4 2 4 153 1 1 0 33 HP Service Outlet 115V GFI amps 15 15 15 15 Indoor Blower Horsepower 1 1 1 1 Motor Full Load Amps 7 4 7 4 3 7 3 Maximum Unit Only 60 50 25 20 Overcurrent With 1 0 33 HP 70 50 25 20 Protection Power Exhaust 3 Minimum Unit Only 44 34 18 14 Circuit With 1 0 33 HP 46 36 19 15 Ampacity Power Exhaust Extremes of operating range are plus and minus 10 of line voltage HACR type breaker or fuse Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements 5 TON STANDARD EFFICIENCY R 410A LGHO60S4 1 Voltage 60hz 208 230V 3 Ph 460V 3 Ph 575V 3 Ph Compressor Rated Load Amps 17 6 9
38. ft unit must be derated 2 for each 1000 ft above sea level NOTE This is the only permissible derate for these units Gas Manifold Pressure Heat Input Type Altitude Feet Input Rate Btuh Natural Gas LPG Propane Standard 1 stage 2001 4500 3 0 9 0 60 000 Medium 1 stage 2001 4500 3 0 9 0 97 000 Medium 2 stage 2001 4500 3 0 1 7 9 0 5 1 97 000 73 500 High 1 stage 2001 4500 3 0 9 0 138 000 High 2 stage 2001 4500 3 0 1 7 9 0 5 1 138 000 105 000 Page 7 Orel 264 Lay See 22213 av eee eee eee eee eae eae eae aes cl ZOZL 926 9EVL SELL 927 ZEEL EZP ALCL 1691 ese OZOL 881 962 666 555 1777 1777 777 1 777 777 777 777 777 VL 160 a PLVS 28612 SVEN MESSER E976 FOOLS 4667 108281 022028 OL VELL 914 SvSL ZLLL OOLL 166 ZLEL 801 LEE 8911 8901 222 GLOL 660 062 228 0901 288 899 555 77 777 777 60 c60l 90S 664
39. stabilizes approximately five minutes Make sure outdoor air dampers are closed 2 Use a thermometer to accurately measure the outdoor ambient temperature 3 Apply the outdoor temperature to tables 11 through 24 to determine normal operating pressures Pressures are listed for sea level applications at 80 dry bulb and 67 F wet bulb return air 4 Compare the normal operating pressures to the pres sures obtained from the gauges Minor variations in these pressures may be expected due to differences in installations Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system Correct any system problems before proceeding 5 If discharge pressure is high remove refrigerant from the system If discharge pressure is low add refrigerant to the system Add or remove charge in increments Allow the system to stabilize each time refrigerant is added or removed 1 Use the following approach method along with the nor mal operating pressures to confirm readings TABLE 11 LGH036S NORMAL OPERATING PRESSURES Outdoor Coil Discharge Suction 5 Entering Air Temp 10 psig psig 2 18 798 30 267 305 o o 4 WE 57 140 142 146 147 sor 150 Page 39 TABLE 12 LGH036S REHEAT NORMAL OPERATING PRESSURES Entering Air Temp 10 psig psig 65 F 75 F 85 F 95 F 105 F 115 TABLE 13 LGH
40. table 1 TABLE 1 LED Steady Off No power or control hardware fault Steady On Power applied Control OK 3 Flashes Ignition lockout from too many trials 4 Flashes Ignition lockout from too many flame losses within single call for heat 5 Flashes Control hardware fault detected Flame rectification sensing is used on all LGH units Loss of flame during a heating cycle is indicated by an ab sence of flame signal 0 microamps If this happens the con trol will immediately restart the ignition sequence and then lock out if ignition is not gained after the third trial See System Service Checks section for flame current measurement The control shuts off gas flow immediately in the event of a power failure Upon restoration of gas and power the control will restart the ignition sequence and continue until flame is established or system locks out Operation On heating demand the ignition control checks for a closed limit switch Once this check is complete and con ditions are correct the ignition control then allows 30 seconds for the combustion air inducer to vent exhaust gases from the burners When the combustion air induc er is purging the exhaust gases the combustion air prove switch closes proving that the combustion air in ducer is operating before allowing the ignition control to energize When the combustion air prove switch is closed and the delay is over the ignition control acti vates the gas valve t
41. two stage gas valve Both type valves are manufactured by Honeywell On a call for first stage heat low fire the valve is energized by the ignition control simultaneously with the spark elec trode On a call for second stage heat high fire the sec ond stage operator is energized directly from A55 Unit Controller A manual shut off knob switch is provided on the valve for shut off Manual shut off knob switch imme diately closes both stages without delay On both valves first stage low fire is quick opening on and off in less than 3 seconds The Honeywell valve is adjustable for both low fire and high fire Figures 15 and 16 show gas valve components Table 9 shows factory gas valve regulation for LGH series units TABLE 9 Operating Manifold Pressure 1057 05 WE The gas manifold pressure should be adjusted when the unit is instaled at altitudes higher than 2000 feet See table 10 for the proper setting TABLE 10 HIGH ALTITUDE DERATE Altitude Ft Gas Manifold Pressure 2000 4500 See Unit Nameplate 4500 And Above Derate 2 1000 Ft Above Sea Level NOTE This is the only permissible derate for these units 9 Spark Electrode Ignitor Figure 13 An electrode assembly is used for ignition spark The electrode is mounted through holes under the right most burner location The electrode tip protrudes into the flame envelope of the adjacent burner The electrode as sembly is fastened to burner supports and
42. units are C S A design certified without modifi cation Before checking piping check with gas company or au thorities having jurisdiction for local code requirements Refer to the LGH Installation instruction for more infor mation GAS PIPING COMPONENTS REFER TO INSTALLATION INSTRUCTIONS GROUND JOINT UNION MANUAL MAIN SHUT OFF VALVE REFER TO LOCAL CODES CAP HERE TO ISOLATE VALVE WHEN PRESSURE TESTING LINE ROOF MOUNTING FRAME DRIP LEG gt GAS PIPING SUPPORT FIGURE 17 1 Gas Piping Gas supply piping must not allow more than 0 5 W C 124 3 Pa drop in pressure between the gas meter and the unit Supply gas pipe must not be smaller than the unit gas connection Refer to installation instructions for de tails 2 Testing Gas Piping case shutdown is required turn off the main manual shut off valve and disconnect the main power to the unit These controls should be properly labeled by the installer When pressure testing gas lines the gas valve must be dis connected and isolated Gas valves can be damaged if subjected to more than 0 5 psig 14 W C 3481 Pa See figure 17 When checking piping connection for gas leaks use the preferred means Common kitchen detergents can cause harmful corrosion on various metals used in gas piping The use of specialty Gas Leak Detector is strong ly recommended It is available through Lennox under part number 31B2001 See CORP 8411 L10 f
43. 0 84 775 0 89 804 0 94 830 0 98 2200 560 0 59 593 0 64 627 0 7 660 0 75 693 0 8 725 0 85 757 0 9 787 0 94 814 0 99 840 1 03 2300 578 0 64 610 0 7 644 0 75 676 0 81 709 0 86 740 0 91 770 0 95 799 1 826 1 05 851 1 09 2400 597 0 7 629 0 75 661 0 81 693 0 86 725 0 91 755 0 96 784 1 01 812 1 06 838 1 11 862 1 15 2500 617 0 76 648 0 81 679 0 87 710 0 92 741 0 97 770 1 03 799 1 08 825 1 13 850 1 17 875 1 22 2600 637 0 82 667 0 87 698 0 93 728 0 98 758 1 04 786 1 09 814 1 15 839 1 2 864 1 24 887 1 28 2700 658 0 88 687 0 94 717 1 746 1 05 775 1 11 802 1 16 829 1 22 853 1 27 877 1 31 901 1 36 2800 679 0 95 708 1 01 736 1 07 764 1 12 792 1 18 819 1 24 844 1 3 868 1 35 892 1 39 915 1 43 2900 701 1 02 728 1 08 756 1 14 783 1 2 809 1 26 835 1 32 860 1 38 884 1 43 907 1 47 930 1 52 External Static in w g Air Volume 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM RPM BHP BHP BHP RPM BHP 1900 837 0 92 861 0 96 886 1 91311 04 939 1 07 966 1 11 992 1 1611017 1 21 1041 1 27 1065 1 33 2000 845 0 97 870 1 01 895 1 05 921 1 09 9
44. 036H NORMAL OPERATING PRESSURES Entering Air Temp 10 psig psig 65 F 75 F 145 85 F 95 F 105 F 115 TABLE 14 LGH036H REHEAT NORMAL OPERATING PRESSURES TABLE 17 LGH048H NORMAL OPERATING PRESSURES ee Air Temp 10 psig psig a a 85 J 16 wer 4 19 wp 193 TABLE 18 LGH048H REHEAT NORMAL OPERATING PRESSURES ME Air Temp 10 psig psig ae o 1 1 eT ______ 19 TABLE 19 LGHO060S NORMAL OPERATING PRESSURES Entering Air Temp 10 psig psig ee Air Temp 10 psig psig 65 F 75 F a 35 F 136 J 95 F 38 4 9 2 1057 ET 115 F 153 115 F 500 148 TABLE 15 TABLE 20 LGH048S NORMAL OPERATING PRESSURES Entering Air Temp 10 psig psig 65 F 75 F 857 95 F 105 F 115 TABLE 16 LGH048S REHEAT NORMAL OPERATING PRESSURES Entering Air Temp 10 psig psig 65 F 75 F 85 F 95 F 105 F 115 LGHO060S REHEAT NORMAL OPERATING PRESSURES ee Air Temp 10 psig psig a5 F 50 E J 39 2 wer 4 4 4 1 TABLE 21 LGH060H NORMAL OPERATING PRESSURES Outdoor Coil Discharge Suction 5 ae Air Temp 10 psig psig 06 1 47 14 71 40 TABLE 22 REHEAT NORMAL OPERATING PRESSURES Outdoor Coil Discharge Suction 5 Ente
45. 060 072 4 20 X 20 X 2 508 X 508 X 51 NOTE Filters must be U L C certified or equivalent for use in Canada B Lubrication All motors are lubricated at the factory No further lubrica tion is required REMOVE FILTERS PULL TO REMOVE FILTERS FIGURE 18 C Burners Periodically examine burner flames for proper appearance during the heating season Before each heating season ex amine the burners for any deposits or blockage which may have occurred Clean burners as follows 1 Turn off both electrical power and gas supply to unit 2 Remove burner compartment access panel 3 Remove top burner box panel 4 Remove two screws securing burners to burner sup port and lift the burners from the orifices See figure 12 Clean as necessary AWARNING Danger of explosion Can cause injury death Do not overtighten main burner mounting screws Snug tighten only Ww D Combustion Air Inducer A combustion air proving switch checks combustion air in ducer operation before allowing power to the gas controller Gas controller will not operate if inducer is obstructed Under normal operating conditions the combustion air in ducer wheel should be checked and cleaned prior to the heating season However it should be examined periodi cally during the heating season to establish an ideal clean ing schedule Clean combustion air inducer as follows 1 Shut off power supply and
46. 1400 1452 0 85 1500 1458 0 91 1600 1465 0 97 1700 1473 1 04 1800 1482 1 11 1900 1492 1 18 2000 1503 1 26 2100 15 51 235 2200 1529 1 45 2300 1543 1 55 2400 1286 1 20 1319 1 26 1351 1 32 1382 1 38 1411 1 43 1440 1 48 1470 1 52 1499 1 57 1528 1 61 1558 1 66 16 BLOWER DATA BELT DRIVE 6 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FORALL UNITS ADD 1 Any factory installed options air resistance heat section economizer etc 2 Any field installed accessories air resistance duct resistance diffuser etc See page 19 for blower motors and drives and wet coil and options accessory air resistance data DOWNFLOW External Static in w g Volume 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 9 1 0 cfm RPM RPM BHP BHP RPM BHP RPM BHP RPM BHP BHP BHP BHP RPM BHP 1900 510 0 45 544 0 5 579 0 55 614 0 6 649 0 65 684 0 7 718 0 74 752 0 79 784 0 83 812 0 88 2000 526 0 49 560 0 55 595 0 6 629 0 65 663 0 7 697 0 75 730 0 79 763 0 84 794 0 88 820 0 93 2100 542 0 54 576 0 59 610 0 65 644 0 7 678 0 75 711 0 8 743
47. 15 A39 100245 16 06 1VP44x7 8 P 8 1488 51 1 18L2201 A41 100245 18 07 1VP50x7 8 P 8 2187 54 x 1 100244 19 43 73K8201 01 1VP34x7 8 31K6901 AK69 x 1 37L4701 51 13 0101 02 1VP40x7 8 7950301 100788 03 53 8 4951 1VP40x7 8 7950301 59 x 1 31K6801 50 100245 29 AA04 1VP44x7 8 P 8 1488 59 1 31 6801 51 13 0101 A01T2 1VP34x7 8 31K6901 54 x 1 100244 19 41 100245 18 0272 1VP34x7 8 31K6901 49 x 1 100244 18 40 100245 17 A03T2 1VP34x7 8 31K6901 AK44 x 1 100244 16 A40 100245 17 0512 1VP34x7 8 31K6901 AK41 x 1 100244 15 A41 100245 18 AO6T2 1VP44x7 8 P 8 1488 51 1 18L2201 A41 100245 18 07 2 1VP50x7 8 P 8 2187 AK54 x 1 100244 19 AX43 73 8201 0112 1VP34x7 8 31K6901 AK69 1 37L4701 A50 100245 29 0212 1VP40x7 8 7950301 BK80H 100788 03 52 100245 30 0312 1VP40x7 8 7950301 59 x 1 31 6801 49 100245 32 0412 1VP44x7 8 P 8 1488 59 x 1 31 6801 50 100245 29 NOTES 1 Requires split taper bushing Browning no H1 OEM no 100073 04 2 Includes tension assembly Fenner no FS0590 OEM 101994 02 Page 34 D GAS HEAT COMPONENTS LGH036 units are available 65 000 BTUH 19 kW and 105 000 BTUH 30 8 kW heat sizes LGH048 060 and 072 are available in 65 000 BTUH 19 kW 105 000 BTUH 30 8 kW and 150 000 BTUH 44 kW heat sizes Two stage heat is available in units with 105 000 BTUH 30 8 kW and 150 000 BTUH capacities See
48. 20 x 2 Order 4 K1FLTR30A 2 44360 X X Indoor Air Quality CO Sensors Sensor Wall mount off white plastic cover with LCD display COSNSRSOAE1L 77 39 X X X X Sensor Wall mount off white plastic cover no display COSNSR52AE1L 87N53 X X X X Sensor Black plastic case with LCD display rated for plenum mounting COSNSR51AE1L 87 52 X X X X Sensor Wall mount black plastic case no display rated for plenum mounting COMISC19AE1 87 54 X X X X CO Sensor Duct Mounting Kit for downflow applications COMISC19AE1 85143 X X X X Aspiration Box for duct mounting non plenum rated CO sensors COMISC16AE1 90 43 X X X X 87N53 or 77N39 UVC Germicidal Lamps Healthy Climate UVC Light Kit 208 230v 1ph C1UVCL10AN1 50W90 OX OX OX OX ROOF CURBS DOWNFLOW Clip Curb 8 in height T1CURB23AN1 16W93 X X X X 14 in height T1CURB20AN1 16W94 X X X X 18 in height T1CURB21AN1 16W95 X X X X 24 in height T1CURB22AN1 16W96 X X X X Hinged 8 in height T1CURB30AN1 17W46 X X X X 18 in height T1CURB32AN1 17W47 X X X X 24 in height T1CURB33AN1 17W48 X X X X Standard 14 in height T1CURB10AN1 13W27 X X X X Adjustable Pitched Curb 14 in height C1CURBS55AT1 43W27 X X X X Transition Curb Matches Energence 036 072 Units to existing L Series Curbs E1CURB60A 1 20W06 X X X X CEILING DIFFUSERS Step Down Order one RTD9 65 R 27G87 X X X RTD11 95 29604 X Canada Only RTD11 95S 13K61 X Flush Order one FD9 65 R 27686 X X X FD11 95 29608 X Canada Only
49. 205 Gas Valve with ON OFF Lever Single Stage MANIFOLD PRESSURE ADJUSTMENT SCREW MANIFOLD PRESSURE OUTLET INLET PRESSURE PORT GAS VALVE SHOWN IN ON POSITION FIGURE 15 Honeywell VR8205Q VR8305Q Series Gas Valve Two Stage HIGH FIRE ADJUSTMENT LOW FIRE ADJUSTMENT MANIFOLD PRESSURE TAP PRESSURE TAP Gas valve knob is shown in OFF position FIGURE 16 5 Honeywell VR8205 Gas Valve with ON OFF Lever Switch gas valve lever to OFF See figure 15 Honeywell VR8205 Gas Valve with Knob Turn knob on gas valve clockwise aff to OFF Do not force See figure 16 Honeywell VR8205 Gas Valve with ON OFF Lever Switch gas valve lever to ON See figure 15 Honeywell VR8205 Gas Valve with Knob Turn knob on gas valve counterclockwise 4 to ON Do not force See figure 16 1 7 Close or replace the heat section access panel 8 Turn on all electrical power to appliance 9 Set thermostat to desired setting NOTE When unit is initially started steps 1 through 9 may need to be repeated to purge air from gas line 10 If the appliance will not operate follow the instructions Turning Off Gas to Appliance and call your service technician or gas supplier Turning Off Gas to Unit 1 If using an electromechanical thermostat set to the lowest setting 2 Before performing any service turn off all e
50. 26 GFI Service Outlets LTAGFIK10 15 74M70 Phase Voltage Detection 3 Phase Models Only Factory ECONOMIZER Economizer With Outdoor Air Hood Sensible Control Economizer With Barometric Relief Dampers and Exhaust Hood Factory Economizer With Power Exhaust Fan and Barometric Relief Dampers with Exhaust Hood Factory Economizer No Exhaust Option Factory Economizer With Barometric Relief Damper with Hood E1ECON30A 1 53W33 X X 1 53W36 X Horizontal Economizer Conversion Kit T1HECKOOAN1 17W45 X X X X Economizer Controls Differential Enthalpy Order 2 C1SNSR64FF1 53W64 OX OX OX Sensible Control Sensor is Furnished Factory Single Enthalpy C1SNSR64FF1 53W64 OX OX OX Global Control Sensor Field Provided Factory OUTDOOR AIR Outdoor Air Dampers Damper Section Manual Includes Outdoor Air Hood C1DAMP11A 1 53W34 OX OX C1DAMP11AT1 53W37 OX OX Damper Section Motorized Includes Outdoor Air Hood E1DAMP21A 1 53W35 OX OX E1DAMP21AT1 53W38 OX POWER EXHAUST FAN Standard Static 208 230V 1 or 3ph C1PWRE10A 1P 79W87 OX OX Note Includes Barometric Relief Dampers 460V 3ph CIPWRE10A 1G 79W88 OX and Exhaust Hood when factory 575V 3ph C1PWRE10A 1J 79W89 installed Order Barometric Reilef 208 230 1 CIPWRE10A
51. 48 1 12 974 1 17 999 1 22 1023 1 27 1047 1 33 1070 1 39 2100 1 18 982 1 22 1006 1 28 1030 1 34 1053 1 4 1075 1 46 2200 1 24 990 1 29 1014 1 34 1037 1 41 1059 1 47 1081 1 54 2300 1 3 999 1 35 1022 1 41 1044 1 48 1066 1 55 1087 1 62 2400 1 37 1009 1 43 1031 1 49 1052 1 57 1073 1 64 1094 1 71 2500 1 44 1018 1 51 1039 1 58 1060 1 65 1080 1 73 1101 1 8 2600 912 1 32 936 1 36 960 1 41 984 1 46 1007 1 52 1028 1 59 1049 1 67 1069 1 75 1089 1 82 1109 1 89 2700 925 1 4 949 1 44 973 1 49 996 1 55 1018 1 61 1038 1 69 11058 1 76 1078 1 84 1098 1 92 1118 1 99 2800 939 1 47 962 1 52 985 1 57 1008 1 64 1029 1 71 1049 1 79 1069 1 87 1088 1 94 1107 2 02 1127 2 09 2900 953 1 56 976 1 61 998 1 67 1020 1 73 1041 1 81 1060 1 89 1079 1 98 1098 2 06 1117 2 13 1137 2 21 17 BLOWER DATA BELT DRIVE 6 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FORALL UNITS ADD 1 Any factory installed options air resistance heat section economizer etc 2 Any field installed accessories air resistance duct resistance diffuser etc See page 19 for blower motors and drives and wet coil and options accessory air resistance data HORIZONTA
52. 5 and extended mount diffuser return RTD9 65 and RTD11 95 are available for use with all LGH units Refer to manufacturer s instructions included with tran sition for detailed installation procedures E Economizer Field or Factory Installed Unit may contain an optional economizer See figure 24 The economizer uses outdoor air for free cooling when the temperature is suitable Outdoor Air Suitability Sensors or a global input are used to determine outdoor air suitability for free cooling See table 28 Once outdoor air suitability is enabled the factory installed discharge air temperature sensor RT6 is used to modulate dampers to 55 F 13 C discharge air See the Unit Controller guide to adjust this setpoint NOTE Free cooling can also be enabled by a message from an energy management system EMS These sys tems may require additional field provided sensors refer to manufacturers instructions ECONOMIZER CONTROLS ECONOMIZER FIGURE 24 Sensors The appropriate sensors are provided when the economiz er is factory installed When the economizer is field instal led the ODE mode requires additional field provided sen sor s See table 28 The TEMP mode uses sensors provided with all units DIP Switches Damper mode is selected using the Unit Controller at unit start up Refer to the Unit Controller guide provided with each unit See figure 25 for switch location and figure 26 for DIP switch settings Page 47
53. 6 967 1 51 990 1 57 1012 1 62 1034 1 69 1056 1 75 1077 1 82 1098 1 89 2800 910 1 44 933 1 49 955 1 54 978 1 6 1001 1 65 1023 1 72 1044 1 78 1066 1 85 1086 1 92 1107 1 99 2900 923 1 52 945 1 57 968 1 63 990 1 68 1012 1 75 1034 1 81 1055 1 88 1076 1 95 1096 2 02 1116 2 09 18 BLOWER DATA BELT DRIVE KIT SPECIFICATIONS 036 060 Model Motor HP No of Drive Kits and RPM Range Nominal Maximum Speeds 01 A02 A03 A05 06 07 036 0 75 0 86 2 low 449 673 high 673 1010 1 1 15 2 low 598 897 ome high 897 1346 048 0 75 0 86 2 low 497 673 gt high 745 1117 2 2 3 2 low 714 953 zas high 1071 1429 060 1 45 2 sac low 555 833 high 833 1250 2 2 3 2 low 808 1032 high 1212 1548 BELT DRIVE KIT SPECIFICATIONS 072 Model Motor HP No of Nominal Maximum Speeds AA01 02 03 072 1 1 15 1 522 784 2 2 3 1 I 632 875 798 1105 FACTORY INSTALLED OPTIONS FIELD INSTALLED ACCESSORY AIR RESISTANCE in w g Air Wet Indoor Coil Humiditrol Gas Heating Filters 036 048 060 072 Ea High Heat MERV
54. 6 SUPPLY AIR SENSOR 1 OPERATION 2 a N 5 4100 100 HOSN3S eo m A car fL poe J264C pe 52 S BUS RS485 gt JACK 8 OO P304 PLUG BLOWER DECK PLUG THERMOSTAT DDC INTERFACE 552 cm RT6 199 99 A 1 A A A A A A FIRE ALARM CONTACT SUPPLIED L BYOTHERS _ FOR MOTORS WITH S42 AND S135 EXTERNAL OVERLOAD LESB INVERTER SEE INVERTER WITH BY PASS FOR S42 HOOK UP USE S86 DEHUMIDISTAT AND K55 FOR OPTIONAL SUPERMARKET REHEAT SCHEME M2 PARAMETERS NEED TO BE MODIFIEDJNDER HESETTINGMENUORVIA UCSOFTWARE FOR SIMULTANEOUS HEATING AND COOLING REMOTE LOCATION OF RT6 P298 8 DO 1 IS SERVICE RELAY OUTPUT 24VAC IF USED CONNECT TO AN INDICATOR LIGHT THERMOSTAT HOOKUP FOR PROGRAMMABLE CONFIGURATIGN OF THE M2 BOARD 55 M2 SETTINGS MUST BE MODIFIED 42 S42 552 5135 OR S149 ARE INSTALLED A42 USED ON 036 THROUGH 72 UNITS ONLY CONNECT A172 SENSOR TO J261 ON SUPPLY AIR SMOKE DETECTOR ONLY DESIGNATES OPTIONAL WIRING CLASSII FIELD WIRING i rrt WIRING DIAGRAM ACCESSORIES ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT FOR ENERGENCE Supersedes New Form No ea O and energizes the appropriate components for heat or cool demand Page 59 A55 receives data from the electronic thermostat A2 Y1 Y2 W1 W2 G Lennox Commercial A55 Un
55. 7 4 Locked Rotor Amps 135 62 50 Outdoor Fan Full Load Amps 24 123 1 Motor Power Exhaust Full Load Amps 2 4 1 3 1 1 0 33 HP Service Outlet 115V GFI amps 15 15 15 Indoor Blower Horsepower 1 2 1 2 1 2 Motor Full Load Amps 4 6 7 5 2 1 3 4 1 7 2 7 2 Maximum Unit Only 45 45 20 20 15 20 Overcurrent With 1 0 33 HP 45 50 20 25 20 20 Protection Power Exhaust 3 Minimum Unit Only 29 32 15 16 12 13 Circuit With 1 0 33 HP 32 35 16 18 13 14 Ampacity Power Exhaust 1 Extremes of operating range plus and minus 10 of line voltage 2 HACR type breaker or fuse 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Page 23 ELECTRICAL DATA 6 TON 6 TON HIGH EFFICIENCY R 410A LGH072H4 Voltage 60hz 208 230V 3 Ph 460V 3 Ph 575V 3 Ph Compressor Rated Load Amps 19 9 7 7 4 Locked Rotor Amps 123 62 50 Outdoor Fan Full Load Amps 2 4 1 3 1 Motor Power Exhaust Full Load Amps 2 4 1 3 1 1 0 33 HP Service Outlet 115V GFI amps 15 15 15 Indoor Blower Horsepower 1 2 1 2 1 2 Motor Full Load Amps 46 7 5 2 1 3 4 1 7 2 7 2 Maximum Unit Only 45 50 25 25 15 20 Overcurrent With 1 0 33 HP 50 50 25 25 20 20 Protection Power Exhaust 3 Minimum Unit Only 31 34 16 17 12 13 Circuit With 1 0 33 HP 34 37 17 19 13 14 Ampacity Power Exhaust 1 Extremes of operating range are plus and minus 10 of line voltage
56. 75 1337 0 79 1372 0 82 1406 0 85 1441 0 89 1477 0 93 1500 1156 0 65 1198 0 69 1237 0 73 1275 0 77 1311 0 8 1346 0 84 1381 0 88 1415 0 91 1450 0 95 1486 0 98 1600 1171 0 7 1211 0 74 1249 0 78 1286 0 82 1321 0 86 1356 0 9 1390 0 93 1425 0 97 1460 1 01 1496 1 05 1700 1186 0 76 1225 0 8 1262 0 84 1298 0 88 1333 0 92 1367 0 96 1401 1 1436 1 03 1471 1 07 1507 1 12 1800 1202 0 83 1240 0 87 1276 0 91 1311 0 95 1345 0 99 1380 1 03 1413 1448 1 11 1483 1 15 1520 1 19 1900 1220 0 9 1256 0 94 1291 0 99 1326 1 03 1360 1 07 1393 1427 1462 1 18 1497 1 22 1534 1 27 14 BLOWER DATA BELT DRIVE 5 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FORALL UNITS ADD 1 Any factory installed options air resistance heat section economizer etc 2 Any field installed accessories air resistance duct resistance diffuser etc See page 19 for blower motors and drives and wet coil and options accessory air resistance data DOWNFLOW Air External Static in w g Volume 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 9
57. 8 ind 036 048 MODELS 800 0 01 0 01 ses 0 00 0 02 0 02 0 04 0 04 0 05 1000 0 02 0 02 ns 0 00 0 02 0 02 0 04 0 04 0 07 1200 0 03 0 04 0 01 0 02 0 02 0 04 0 04 0 07 1400 0 04 0 05 EAE 0 02 0 02 0 03 0 04 0 04 0 07 1600 0 05 0 06 0 03 0 03 0 04 0 04 0 04 0 07 1800 0 06 0 07 aS 0 04 0 04 0 05 0 05 0 04 0 07 2000 0 08 0 09 0 04 0 04 0 06 0 05 0 05 0 08 060 072 MODELS 1000 ane 0 02 0 00 0 02 0 02 0 04 0 03 0 05 1200 222 0 04 0 00 0 02 0 02 0 04 0 03 0 07 1400 ase 0 05 0 01 0 02 0 03 0 04 0 04 0 07 1600 sis 0 07 0 02 0 03 0 04 0 04 0 04 0 07 1800 0 08 0 02 0 03 0 05 0 05 0 05 0 07 2000 pe 0 10 0 03 0 04 0 06 0 05 0 05 0 07 2200 0 11 0 04 0 04 0 07 0 05 0 05 0 08 2400 es m 0 13 0 04 0 05 0 08 0 05 0 05 0 08 2600 ewe 222 0 15 0 05 0 05 0 09 0 06 0 05 0 08 2800 m 0 16 0 05 0 06 0 10 0 06 0 05 0 08 3000 see aoe 0 18 0 06 0 07 0 11 0 06 0 05 0 08 POWER EXHAUST FAN PERFORMANCE Return Air System Static Air Volume Exhausted Return Air System Static Air Volume Exhausted Pressure Pressure cfm cfm in w g in w g 036 048 MODELS 060 072 MODELS 0 00 2000 0 00 3175 0 05 1990 0 05 2955 0 10 1924 0 10 2685 0 15 1810 0 15 2410 0 20 1664 0 20 2165 0 25 1507 0 25 1920 0 30 1350 0 30 1420 0 35 1210 0 35 1200 Page 19 BLOWER DATA CEILING DIFFUSERS AIR RESISTANCE in w g
58. 878 0 24 927 0 26 979 0 29 1029 0 31 800 471 0 09 542 0 13 614 0 16 696 0 19 777 0 21 841 0 23 889 0 26 938 0 29 990 0 31 1042 0 34 900 493 0 11 563 0 15 634 0 19 715 0 21 793 0 23 854 0 26 902 0 29 950 0 32 1002 0 34 1054 0 36 1000 517 0 14 587 0 18 657 0 21 736 0 24 811 0 26 869 0 29 916 0 32 964 0 35 1015 0 37 1067 0 4 1100 544 0 17 613 0 21 683 0 24 759 0 27 831 0 3 886 0 32 931 0 36 978 0 38 1028 0 41 1078 0 43 1200 574 0 2 643 0 24 711 0 27 784 0 3 852 0 33 904 0 36 947 0 39 993 0 42 1042 0 45 1091 0 47 1300 608 0 24 676 0 28 743 0 31 812 0 34 875 0 37 923 0 4 964 0 44 1010 0 46 1057 0 49 1104 0 51 1400 645 0 28 711 0 31 776 0 35 842 0 38 898 0 41 942 0 44 983 0 48 1028 0 51 1074 0 53 1120 0 56 Air Volume cfm External Static in w g 1 2 1 4 1 5 1 6 RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 700 1078 0 33 1124 0 36 800 1091 0 36 1137 0 39 1180 0 41 1221 0 44 1260 0 47
59. 999 0 60 1036 0 65 1074 0 69 1112 0 73 1150 0 77 1188 0 81 2000 879 0 47 913 0 52 948 0 56 984 0 61 1020 0 67 1058 0 72 1096 0 76 1134 0 80 1172 0 84 1210 0 88 2100 900 0 53 935 0 58 970 0 63 1007 0 69 1044 0 74 1081 0 79 1119 0 84 1157 0 88 1195 0 91 1233 0 95 2200 922 0 60 958 0 65 994 0 71 1031 0 76 1068 0 82 1106 0 87 1143 0 91 1180 0 95 1218 0 99 1255 1 03 2300 947 0 67 983 0 73 1020 0 79 1057 0 85 1094 0 90 1131 0 95 1168 1 00 1205 1 03 1242 1 07 1277 1 13 2400 974 0 76 1010 0 82 1047 0 88 1084 0 94 1120 0 99 1157 1 04 1193 1 08 1230 1 12 1267 1 16 1300 1 23 External Static in w g Air Volume 1 2 1 3 1 4 1 5 1 6 1 8 cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 1100 1106 0 44 1151 0 47 1197 0 49 1238 0 52 1272 0 56 1200 1117 0 48 1161 0 51 1206 0 53 1245 0 57 1278 0 60 1312 0 64 1346 0 67 1380 0 71 1300 1129 0 52 1172 0 55 1216 0 58 1254 0 61 1287 0 65 1320 0 69 1354 0 72 1388 0 76 1421 1400 1143 0 57 1185 0 60
60. DIRECT DRIVE AND BELT DRIVE SYSTEM OPERATION 3 THROUGH 5 TONS Note Direct drive units feature ECM condenser fans that are staged to match the compressor s capacity When compres sor is operating at first stage the condenser fan is operating at low speed The condenser fan switches to high speed when the compressor switches to second stage to match operation Modulating Outdoor Air Damper Damper minimum positions 1 and 2 are adjusted during unit setup to provide minimum fresh air requirements at the indi cated supply fan speeds per ASHRAE 62 1 Supply fan is off and the outdoor air damper is closed Supply fan is on low speed and the outdoor air damper is at minimum position 1 Supply fan is on high speed and the outdoor air damper is at minimum position 2 Outdoor Air is Suitable Note When outdoor air is not suitable during the occupied time period damper modulates to minimum position When out door air is not suitable during the unoccupied time period damper modulates closed Cooling Thermostat or Zone Sensor Mode Up to 3 stages Y1 Y2 Y3 Y1 demand 1st Compressor is off supply fan is on low speed economizer modulates minimum to maximum open position to maintain 55 F supply air temperature default unit controller setting 2nd After 5 minutes default unit controller setting supply fan switches to high speed Economizer continues modulating with supply fan on high speed to maintain 55 F supply air tempera
61. Gas Heat Specifications on Page 7 for more detail 1 Heat Exchanger Figure 11 The LGH units use aluminized steel inshot burners with tubular aluminized stainless is optional steel heat ex changers and redundant gas valve Burners in all units use a burner venturi to mix gas and air for proper combus tion Combustion takes place at each tube entrance As hot combustion gases are drawn upward through each tube by the combustion air inducer exhaust gases are drawn out the top and fresh air gas mixture is drawn in at the bottom Heat is transferred to the air stream from all surfaces of the heat exchanger tubes The supply air blower forces air across the tubes to extract the heat of combustion The shape of the tubes ensures maximum heat exchange The gas valves on two stage units accomplish staging by al lowing more or less gas to the burners as called for by heating demand 2 Burner Box Assembly Figure 12 The bumer assembly consists of a spark electrode flame sensing electrode and gas valve Ignition board A3 controls all functions of the assembly Burners All units use inshot burners Burners are factory set and do not require adjustment A peep hole with cover is fur nished in the heating access panelforflame viewing Always operate the unit with the access panel in place Burners can be removed individually for service Burner maintenance and service is detailed in the SERVICE CHECKS section of this manual Orifice Each burn
62. L Air Volume cfm External Static in w g 0 20 0 30 0 60 0 70 0 9 1 0 RPM RPM BHP 1900 485 0 55 516 0 57 549 0 59 583 0 62 618 0 65 654 0 69 689 0 73 724 0 77 758 0 82 790 0 86 2000 499 0 59 531 0 61 563 0 63 597 0 66 631 07 666 0 73 701 0 77 734 0 82 767 0 86 798 0 91 2100 514 0 63 546 0 65 578 0 68 611 0 71 645 0 74 679 0 78 0 82 745 0 86 777 0 91 806 0 96 2200 530 0 68 562 0 7 594 0 73 627 0 76 660 0 79 693 0 83 725 0 87 757 0 92 787 0 96 816 1 01 2300 548 0 73 579 0 75 610 0 78 643 0 81 675 0 85 707 0 88 738 0 93 769 0 97 798 1 02 826 1 06 2400 566 0 78 596 0 81 628 0 84 659 0 87 691 0 9 722 0 94 752 0 98 782 1 03 810 1 08 837 1 12 2500 585 0 84 615 0 86 645 0 9 676 0 93 707 0 96 737 1 767 1 05 795 1 09 822 1 14 848 1 19 2600 604 0 9 634 0 93 664 694 0 99 724 1 03 753 1 07 781 1 11 809 1 15 835 861 1 25 2700 624 0 96
63. ON AND INSULATION THICKNESS WARNING ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES DISCONNECT ALL POWER BEFORE SERVICING a 169 5 269 1269 VO 5 PWM gt 4 HO 2441 w 5 Y gt VO PWM 1 a B4 LSIGNALS 1 7 299 d A P268 24V COMMON EQUIPMENT GROUND H 120 60 1 N P268 PLUG TRANFORMERS PLUG HUMIDITROL R SENSOR OUTDOOR AIR S40 THERMOSTAT CRANKCASE 5 GROUND 120 V HELD PROVIDED POWER SUPPLY IS REQUIRED USED ON G J AND Y VOLTAGE APPLICATION T4 USED ONLY ON G AND VOLTAGE UNITS EXTERNAL HUMIDITROL CONTACTS A CONNECT TO L2 ON SINGLE PHASE UNITS ONLYIN UNITSWITH HUMIDITROLOR PHASE DETECTION OPTION MOVEWIREFROM240 TO 208 TAPONT1 OR T43 TRANSFORMERSOR208 LINE VOLTAGE APPLICTIONS J268 1 3 AND J268 2 4 ARECONNECTEDN UNITS WITHOUT HUMIDITROL OR PHASE DETECTION OPTIONS A 549 IS PART OF A 5VDC CIRCUIT Page 54 a E pm rm rm gt gt gt gt gt gt m gt T gt e 7 2 24 POWER DESCRIPTION COMPO CONTROL MAIN PANEL LENNOX B1 COMPRI NENT PANEL MOTOR CONTROL compressor SSCS CAPACITOR COMPRESSOR CAPACITOR COMPRESSOR HARD START JACK ECONOMIZER BYPASS GFI RECEPTICLE CK EXHAUST FAN
64. OW 30 30 30 Damper minimum position during low in 30 door blower MIN OCP BLOWER HIGH Damper minimum position during high in door blower 101 setting allows manual potentiometer control on the A55 Unit Controller Installer Circle applicable unit model number and record any ECTO changes under Field Setting column Settings need to be recorded by install er for use when unit controller is replaced or reprogrammed Refer to unit controller guide Setting menu path or use optional software to change settings TABLE 4 MINIMUM AND MAXIMUM PULLEY ADJUSTMENT Belt Min Tums Open Maxi Turns Open PULLEY ALIGNMENT ALIGNED BELT BLOWER PULLEY NOT ALIGNED FIGURE 10 Page 32 F Blower Belt Adjustment Units Equipped With An INSTALL BELT Optional Belt Tensioner 1 Remove blower belt DRIVER 2 Remove bracket from blower housing See figure 11 1 PENSIONER PULLEY 3 Remove the screw from the back side of the bracket 4 4 Move the tensioner to the appropriate adjustment hole N 1 P and reinstall screw rel ras 5 Replace bracket 6 Replace blower belt See figure 12 ADJUST BELT TENSIONER INDICATOR SHOULD BE MAXIMUM BETWEEN MINIMUM AND TENSION MAXIMUM TENSION LINES MINIMUM TENSION DRIVEN PULLEY ROTATE DRIVEN PULLEY TO SEAT BELT TENSIONER TIGHTEST BELT POSITION es 8 TIGHTER BELT FIGURE 12 POSITION FACTORY SET
65. POSITION FIGURE 11 Page 33 G Check Belt Tension Example Deflection distance of a 40 span would be Overtensioning belts shortens belt and bearing life Check 40 64 or 5 8 belt tension as follows Example Deflection distance of a 400mm span would 1 Measure span length X See figure 13 1 1 3 Measure belt deflection force For a used belt the 2 Apply perpendicular force to center of span X with deflection force should be 5 Ibs 35kPa A new belt enough pressure to deflect belt 1 64 for every inch of deflection force should be 7 16 48kPa span length or 1 5mm per 100mm of span length ne A force below these values indicates an underten sioned belt A force above these values indicates an overtensioned belt MEASURE BELT TENSION H Field Furnished Blower Drives For field furnished blower drives use Page 11 through Page 18 to determine BHP and RPM required Reference figure 5 to determine the drive kit number DEFLECTION 1 64 PER INCH OF SPAN OR 1 5mm PER 100mm OF SPAN FIGURE 13 TABLE 5 MANUFACTURER S DRIVE COMPONENT NUMBERS DRIVE COMPONENTS Drive No Motor Pulley Blower Pulley Belt Supplier No OEM Part No Supplier No OEM Part No Supplier No OEM Part No A01 1VP34x7 8 31K6901 54 x 1 100244 19 40 100245 17 A02 1VP34x7 8 31K6901 49 x 1 100244 18 A39 100245 16 A03 1VP34x7 8 31K6901 AK44 x 1 100244 16 A39 100245 16 A05 1VP34x7 8 31K6901 AK41 x 1 100244
66. R STRIP Field Supplied Furnished CANT STRIP Field Supplied RIGID INSULATION Field Supplied MOUNTING FRAME Extends around entire perimeter of unit FIGURE 21 C Outdoor Air Dampers E1DAMP11A 1 manually operated outdoor air damper and E1DAMP21A 1 motorized outdoor air damper is available for LGH 3 and 4 ton units see figure 22 or 23 E1DAMP11AT 1 manually operated outdoor air damper and E1DAMP21AT 1 motorized outdoor air damper is available for LGH 5 and 6 ton units Both sets include the outdoor air hood The manual damper is set at a fixed point ROOFING MATERIAL Page 46 to bring outside air into the building anytime the blower is operating The motorized damper opens when the blower is operating and the thermostat is sending an occupied sig nal to the Unit Controller If the thermostat signal is unoccu pied the motorized damper will not open Washable filter supplied with the outdoor air dampers can be cleaned with water and a mild detergent It should be sprayed with Filter Handicoater when dry prior to reinstallation Filter Handi coater is R P Products coating no 418 and is available as Lennox Part No P 8 5069 MANUAL OUTDOOR AIR DAMPER PN SLIDE DAMPERS TO ADJUST FRESH AIR INTAKE FIGURE 22 MOTORIZED OUTDOOR AIR DAMPER B7 DAMPER MOTOR FIGURE 23 D Supply and Return Diffusers Optional flush mount diffuser return FD9 65 and FD11 9
67. RPM BHP RPM RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP s08 s8 loce 800 1075 0 36 1122 0 39 1164 0 42 1203 0 45 1241 0 47 900 1086 0 39 1133 0 42 1174 0 45 1213 0 48 1250 0 51 1286 0 54 1322 0 57 1357 0 6 1392 0 64 1000 1094 0 43 1142 0 46 1183 0 49 1222 0 52 1259 0 55 1295 0 58 1330 0 62 1365 0 65 1400 0 68 1435 0 71 1100 1102 0 46 1148 0 49 1191 0 53 1230 0 56 1267 0 6 1303 0 63 1338 0 66 1373 0 69 1408 0 73 1444 0 76 1200 1110 0 5 1156 0 53 1198 0 57 1238 0 61 1275 0 64 1311 0 68 1346 0 71 1381 0 74 1416 0 78 1452 0 81 1300 1120 0 54 1164 0 58 1207 0 62 1246 0 65 1283 0 69 1319 0 73 1354 0 76 1389 0 79 1424 0 83 1460 0 86 1400 1131 0 59 1175 0 63 1216 0 67 1255 0 7 1292 0 74 1327 0 78 1362 0 81 1397 0 84 1432 0 88 1468 0 91 12 BLOWER DATA BELT DRIVE 4 TON BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL AND AIR FILTERS IN PLACE FORALL UNITS ADD 1 Any factory installed options air resistance heat section economizer etc 2 Any field installed accessorie
68. SE OvSL 668 962 8661 998 862 952 668 OGL OBO 108 726 LOZ VOL 269 222 99 09r 40 696 189 608 066 689 006 776 699 888 882 GEYL 818 Scc 006 282 081 VELL LGL GEL 126 802 26 67 999 09 129 066 69v 6568 068 866 727 098 826 219 918 ZZZ LAvL 082 912 0 162 121 969 901 8101 199 L6 908 209 SS 269 60 168 998 298 v8 918 912 1091 022 680 18081 SCZ 602 976 629 09 028 669 v90L 888 68 798 868 699 20 098 868 818 696 V8LL 622 706 0491 EEL 8706 LZESL 289 661 vOVL 929 LGL 6 v9S 80L OLLL 628 97 9 6 vv 6 2 VO 928 2161 982 486 1081 666 769 269 966 0481 669 LL 498 860 767 86 LGF 69 926 707 66 962 0 SHEM W49 WD WD Idd SHEM WD SHEM SHEM WD SHEM SBEM SHEM WD ul 96001 9606 9608 9601 09 05 22 02 4 J030 N 16101 JO 5 0099 YBIH 82 1 jo sbunjes peeds ILON souejsisal josseooe suondo pue 6
69. T1P 79W90 OX Dampers Exhaust Hood below 460V 3ph CIPWRE10AT1G 79W91 OX OX when field installed 575V 3ph CIPWRE10AT1J 79W92 OX OX BAROMETRIC RELIEF Barometric Relief Dampers with Exhaust C1DAMPS50A 1 74W38 X X Hood C1DAMPS50AT1 74W39 X X 1 208 230 1ph not available on belt drive units Required when Economizer is factory installed no exhaust option with field installed Power Exhaust Fan option NOTE Catalog and model numbers shown are for ordering field installed accessories OX Configure To Order Factory Installed or Fileld Installed O Configure To Order Factory Installed X Field Installed Page 3 OPTIONS ACCESSORIES Model Catalog Unit Model No tem Number Number 036 048 060 072 HUMIDITROL CONDENSER REHEAT OPTION Humiditrol Factory Humidity Sensor Kit Remote mounted required COSNSR31AE 1 17 50 INDOOR AIR QUALITY Air Filters Healthy Climate High Efficiency Air Filters MERV 8 16 x 20 x 2 C1FLTR15A 1 54W20 OX OX Order 4 per unit 13 16 x 20 x 2 TIFLTR40A 1 52037 OX 8 20x 20 x 2 C1FLTR15D 1 54W21 OX OX 13 20 x 20 x 2 CTFLTRAOD 1 52W39 OX OX Replaceable Media Filter With Metal Mesh 16 x 20 x 2 Order 4 KIFLTR30A 1 39W09 X X Frame includes non pleated filter media 20 x
70. al Energy System LGH036 072 packaged units are available with optional factory installed components which make them Sun Source Solar Ready These specially equipped units can be matched with solar modules and other optional equip ment so that they can become part of a SunSource Com mercial Energy System Solar energy is first used to meet cooling heating demands When the unit is not operating the system powers lighting appliances and other electronic devices in the building Any surplus power is sent back to the utility company for a pos sible credit check your local utility company for policies The SunSource Commercial Energy System consists of the following components Energence 3 6 ton SunSource Solar Ready pack aged electric electric LCH036 072 HVAC units Solar modules 1 to 21 may be used to vary the amount of electricity generated on three phase units 15 mod ules maximum on single phase units Envoy Communications Gateway monitors solar pow er performance All components must be ordered separately Wiring runs from the roof mounted solar modules to the unit From there power travels to the electrical service pan el using the existing HVAC unit power wiring Page 53 Vill Wiring Diagrams and Sequence of Operation LGH036 060 DIRECT DRIVE J Y VOLTAGE UNIT DIAGRAM NOTE IF ANY WIRE IN THIS APPLIANCE IS REPLACED IT MUST BE REPLACED WITH WIRE OF LIKE SIZE RATING TERMINATI
71. ansformers use two 208 230V TRANSFORMER primary voltage taps as shown figure 3 while 460 G and 575 J voltage transformers use a single primary 208 VOLTS 0 VO voltage tap PRIMARY ORANGE FIGURE 3 2 A Transformers G J voltage All G 460 and 575 J voltage units use transformer T3 mounted in the control box The transformers have an output rating of 0 75A T3 transformer supplies 230 VAC power to the combustion air inducer motor B6 BLACK 3 Transformer T4 G J voltage All G J 460 575 voltage direct drive units use transformer T4 mounted in the control box T4 is a line voltage to 230V transformer to power the indoor blower and outdoor fan motor It is connected to line voltage and is powered at all times 4 Transformer T43 reheat units All reheat units and units with phase detection components are equipped with T43 located in the control box Trans former is rated at 70VA It is connected to line voltage and is powered at all times 5 Unit Controller A55 The Unit Controller provides all unit control functions unit status information unit diagnostics programmable pa rameters and USB verification and profile sharing Refer to the Unit Controller guide provided with the unit Thermostat wires are connected to J297 on the Unit Controller 6 Fan Capacitor C1 three phase belt drive Fan capacitor C1 is used to assist in the start up of condens er fan B4 Ratings
72. ation and service must be performed by a licensed professional installer or equivalent service agency or the gas supplier 4 4 4 a ELECTROSTATIC DISCHARGE ESD Precautions and Procedures A CAUTION Electrostatic discharge affect electronic components Take precautions during unit instal lation and service to protect the unit s electronic controls Precautions will help to avoid control exposure to electrostatic discharge by putting the furnace the control and the technician at the same electrostatic potential Neutralize electro static charge by touching hand and all tools on an unpainted unit surface such as the gas valve or blower deck before performing any service pro cedure ACAUTION Danger of sharp metallic edges Can cause injury Take care when servicing unit to avoid accidental contact with sharp edges Table of Contents AIMPORTANT Options Page 2 Specifications Page 5 The Clean Air Act of 1990 bans the intentional vent ing of refrigerant CFC s and HCFC s as of July 1 High Page 7 1992 Approved methods of recovery recycling or re Blower Data Page 8 claiming must be followed Fines and or Electrical Dat P 21 tion may be levied for non compliance Unit Components Page 26 I Placement and Installation Page 37 AWARN NG Ill
73. be read from the 55 Unit Controller display on direct drive blowers See Unit Controller manual 4 Referring to Page 11 through Page 18 use static pres sure and RPM readings to determine unit CFM Use Page 19 and Page 20 when installing units with any of the options or accessories listed C Adjusting Unit CFM Direct Drive Blowers The supply CFM can be adjusted by changing Unit Control ler settings see the Unit Controller guide provided with the unit Refer to table 3 Adjustments can also be made by us ing optional software Record any CFM changes on the ECTO Settings label located on the inside of the compres sor access panel D Adjusting Unit CFM Belt Drive Blowers The blower RPM can be adjusted at the motor pulley Loos en Allen screw and turn adjustable pulley clockwise in 1 2 turn increments to increase CFM Turn counterclock wise in 1 2 turn increments to decrease CFM See figure 9 Do not exceed minimum and maximum number of pulley turns as shown in table 4 E Blower Belt Adjustment Belt Drive Maximum life and wear can be obtained from belts only if proper pulley alignment and belt tension are main tained Tension new belts after a 24 48 hour period of op eration This will allow belt to stretch and seat grooves Make sure blower and motor pulley are aligned as shown in figure 10 1 Loosen four bolts securing motor base to mounting frame See figure 9 2 To increase belt tension Slide blower motor
74. control through the sensor electrode during unit op eration The current passes from the sensor through the flame to the ground electrode located on the flame elec trode to complete a safety circuit The electrodes should be located so the tips are at least 1 2 12 7 mm inside the flame envelope Do not bend electrodes To measure flame current follow the procedure on the following page NOTE Electrodes are not field adjustable Any alter ations to the electrode may create a hazardous con dition that can cause property or personal injury 1 Disconnect power to unit 2 Remove lead from sensing electrode and install a 0 50DC microamp meter in series between the sens ing electrode and the sensing lead 3 Reconnect power and adjust thermostat for heating demand 4 When flame is established microamp reading should be 0 5 to 1 0 Do not bend electrodes Drop out signal is 09 or less 5 Disconnect power to unit before disconnecting meter Make sure sensor wire is securely reconnected before reconnecting power to unit NOTE If the meter scale reads O the leads are re versed Disconnect power and reconnect leads for proper polarity B Cooling System Service Checks LGH units are factory charged and require no further adjust ment however charge should be checked periodically using the approach method The approach method compares actual liquid temperature with the outdoor ambient temperature See section IV CHARGING NOTE
75. ctrical Code manual to determine wire fuse and disconnect size requirements Page 21 ELECTRICAL DATA 4 TON 4 TON HIGH EFFICIENCY R 410A LGHO48H4 1 Voltage 60hz 208 230V 1 Ph 208 230V 3 Ph 460V 3 Ph 575V 3 Ph Compressor Rated Load Amps 21 2 13 5 6 4 5 Locked Rotor Amps 96 88 41 37 8 Outdoor Fan Full Load Amps 4 1 4 1 24 1 6 Motor Power Exhaust Full Load Amps 2 4 2 4 1 3 1 1 0 33 Service Outlet 115V GFI amps 15 15 15 15 Indoor Blower Horsepower 0 75 0 75 0 75 0 75 Motor Full Load Amps 6 1 6 1 3 1 2 4 2 Maximum Unit Only 50 40 15 15 Overcurrent With 1 0 33 HP 60 40 20 15 Protection Power Exhaust 3 Minimum Unit Only 37 28 14 11 Circuit With 1 0 33 HP 40 30 15 12 Ampacity Power Exhaust 1 Extremes of operating range are plus and minus 10 of line voltage 2 HACR type breaker or fuse 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements 4 TON STANDARD EFFICIENCY R 410A LGHO48S4 1 Voltage 60hz 208 230V 3 Ph 460V 3 Ph 575V 3 Ph Compressor Rated Load Amps 13 5 6 4 5 Locked Rotor Amps 88 41 37 8 Outdoor Fan Full Load Amps 127 11 4 0 7 Motor Power Exhaust Full Load Amps 2 4 1 3 1 1 0 33 HP Service Outlet 115V GFI amps 15 15 15 Indoor Blower Horsepower 0 75 2 0 75 2 0 75 2 Motor Full Load Amps 3 5 7 5 1 6 3 4 1 3 2 7 Maximum Unit Only 35 35 15 15 15 15 Overcurrent
76. downward to tighten the belt This increases the distance between the blower motor and the blower housing 3 To loosen belt tension Slide blower motor upward to loosen the belt This de creases the distance between the blower motor and the blower housing 4 Tighten four bolts securing motor base to the mounting frame Page 31 BLOWER ASSEMBLY TO INCREASE CFM LOOSEN ALLEN SCREW amp TURN PULLEY CLOCKWISE TO DECREASE CFM TURN PULLEY COUNTERCLOCKWISE SIDE VIEW ALLEN SCREW PULLEY TO INCREASE BELT TENSION 1 Loosen four bolts securing motor base to mounting frame 2 Slide the motor downward to tighten the belt 3 Tighten four bolts on motor base LOOSEN ALLEN SCREW TO ADJUST CFM LOOSEN FOUR BOLTS AND SLIDE BLOWER MOTOR DOWNWARD TO TIGHTEN BELT FIGURE 9 TABLE 3 ECTO SETTINGS Unit Controller SETTINGS LGH LCH Unit Factory Settings 036 4 048 4 060 4 CONTROL MSAV Menu Field Setting Description 036 060 S4T SMOKE SPEED 55 80 59 Not Applicable torque for indoor blower smoke speed HIGH SPEED 55 80 59 Not Applicable torque for indoor blower high speed LOW SPEED 28 40 36 Unit Controller SETTINGS LGH LCH Unit Factory Settings Not Applicable torque for indoor blower low speed 036 048 4 060 4 SETPOINTS DAMPER Menu Field Setting Description 036 060 S4T MIN OCP BLOWER L
77. ecessary to temporarily shut down the fur nace until the items can be repaired or replaced 5 Proper Gas Flow Furnace should operate at least 5 minutes before checking gas flow Determine time in seconds for two revolutions of gas through the meter Two revolutions assures a more ac curate time Divide by two and compare to time in table 26 Seconds in table 26 are based on 1 4 3 dial and gas value of 1000 Btu ft for natural and 2500 Btu ft for LP Adjust manifold pressure on gas valve to match time needed NOTE To obtain accurate reading shut off all other gas appliances connected to meter TABLE 26 A IMPORTANT Disconnect heating demand as soon as an accurate reading has been obtained 6 Heat Exchanger To Access or Remove Heat Exchanger From Unit 1 Tum off gas and electric power 2 Remove access panel s and unit center mullion 3 Remove gas valve manifold assembly and burn ers 4 Remove combustion air inducer Pay careful attention to the order in which gaskets and orifice are removed 5 Support heat exchanger to prevent it from falling when final screws are removed 6 Remove screws supporting heat exchanger 7 To install heat exchanger reverse procedure Be sure to secure all wires and check plumbing and burner plate for airtight seal Screws must be torqued to 35 in lbs to ensure proper operation 7 Flame Sensing Flame current is an electrical current which passes from the ignition
78. er and size in 1 1 NPT 1 1 NPT 1 1 NPT 1 1 NPT Expansion device type Balance port TXV removable head 3 Indoor No of Speeds 2 2 2 1 Blower Nominal motor HP Low static 0 75 0 75 1 1 and Drive High static 1 2 2 2 Selection 0 86 2 3 Maximum usable motor output Low static US Only static 1 15 2 3 2 30 Motor Drive kit number 01 02 A03 01 low 449 673 low 497 673 low 555 833 522 784 rpm high 673 1010 high 745 1117 high 833 1250 02 05 06 07 632 875 rpm low 598 897 low 714 953 low 808 1032 high 897 1346 high 1071 1429 high 1212 1548 798 1105 1 10 X 10 1 10 X 10 1 10 X 10 1 15 X9 disposable 4 16 X 20X 2 4 20 X 20X2 Electrical characteristics 208 230V 460V or 575V 60 hz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction 1 2 AHRI Certified to Standard 1 210 240 340 360 95 F outdoor air temperature and 80 F db 67 F wb entering evaporator air minimum external duct static pressure 3 Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations out
79. er uses an orifice which is matched to the burner input The orifice is threaded into the burner manifold The burner is supported by the orifice and will easily slide off for service once the mounting screws are removed from the burners NOTE Do not use thread sealing compound on the ori fices Using thread sealing compound may plug the ori fices Each orifice and burner are sized specifically to the unit Refer to Lennox Repair Parts Listing for correct sizing infor mation 3 Primary High Temperature Limit S10 10 is a SPST N C high temperature primary limit for gas heat in LGH036 072 units S10 is located on the vestibule panel See figure 11 Primary limit S10 is wired to the A55 Unit Controller Its N C contacts open to de energize the ignition control when excessive temperature is reached in the blower compartment If the limit trips three times the Unit Controller will lock out heating operation and reset in one hour HEAT EXCHANGER ASSEMBLY Heat Exchanger Tubes Combustion Air Inducer Bumer S10 Primary Limit FIGURE 11 BURNER BOX ASSEMBLY S47 Rollout Switch E Gas Valve LM 0 1 FIGURE 12 Page 35 4 Flame Rollout Limit Switch S47 Flame rollout limit switch S47 is a SPST N C high temper ature limit located just above the burner air intake opening in the burner enclosures see figure 12 S47 is wired to the 55
80. es 10 F 23 320 POWER EXHAUST FAN CONNECT P18 TO J18 AND P24 TO J24 BEFORE SECURING EXHAUST FAN IN PLACE J18 JACK ON UNDERSIDE OF DIVISION PANEL J24 JACK ON INSIDE OF 1 7 ECONOMIZER PANEL FIGURE 27 Page 52 c Thermostat switch S61 is an auto reset SPST N O switch which closes on a temperature drop The switch is wired in series with HR6 When tem perature drops below 20 F 7 C the switch closes and electric heater is energized The switch automatically opens when heating compartment temperature reaches 70 F 21 C J Control Systems The 55 Unit Controller provides all control function for the rooftop unit Default operation requires a standard room thermostat or direct digital controller DDC The A55 can also control the unit from a zone temperature sensor The A55 Unit Controller is a network controller when daisy chained to the L Connection Network Control System For ease of configuration the A55 can be connected to a PC with Unit Controller PC software installed K Smoke Detectors A171 and A172 Photoelectric smoke detectors are a factory or field installed option The smoke detectors can be installed in the supply air duct A172 return air section A171 or in both the supply duct and return air section L Dirty Filter Switch S27 The dirty filter switch senses static pressure increase indi cating a dirty filter conditio
81. g of economizer The damper actuator provides 2 to 10 VDC position feedback Page 60
82. gas to unit 2 Remove the mullion on the right side of the heat sec tion 3 Disconnect pressure switch air tubing from combustion air inducer port Page 44 4 Remove and retain screws securing combustion air inducer to flue box Remove vent connector See fig ure 11 5 Clean inducer wheel blades with a small brush and wipe off any dust from housing Take care not to dam age exposed fan blades Clean accumulated dust from front of flue box cover 1 Return combustion air inducer motor and vent connec tor to original location and secure with retained screws It is recommended that gaskets be replaced during reassembly 7 Replace mullion 1 Clean combustion air inlet louvers on heat access pan el using a small brush E Flue Passageway and Flue Box Remove flue box cover only when necessary for equip ment repair Clean inside of flue box cover and heat ex changer tubes with a wire brush when flue box cover has to be removed Install a new flue box cover gasket and re place cover Make sure edges around flue box cover are tightly sealed F Evaporator Coil Inspect and clean coil at beginning of each cooling season Clean using mild detergent or commercial coil cleanser Flush coil and condensate drain with water taking care not to get insulation filters and return air ducts wet G Condenser Coil Clean condenser coil annually with detergent or commercial coil cleaner and inspect monthly during t
83. gt CIRCUIT BREAKER MAIN DISCONNECT UNIT CIRCUIT BREAKER TRANSFORMER 43 CB31 HEATER COMPRESSOR PWM gt GFI RECEPTICLE ore PWM gt J264 ACK BLOWER DECK J265 ACK CONTACTORS AND RELAYS J267 ACK OUTDOOR FAN AREA ACK TRANSFORMER 1 POWER JACK HUMIDITROL ACK HUMIDITROL INTERFACE w a M Y ee Voy CONTACTOR BLOWER LOW 4 RELAY OUTDOOR FAN 1 Qi 1 CONTACTOR BLOWER HI RELAY EXHAUST FAN P265 P259 3 4 18 2 VALVE SOLENOID REHEAT COIL 1 J265A J260 SOLENOID TWO STAGE PLUG ECONOMIZER BYPASS PLUG EXHAUST FAN J265C PLUG EXHAUST FAN A a PLUG OUTDOOR FAN GND p259___ PLUG BLOWER ECM MOTOR 24V COMMON 260 PLUG BLOWER COMP TWO SPEED CONTROL 263 PLUG HIGH AND LOW PRESSURE SWITCHES J268 J265C J265A J260A P264 PLUG BLOWER DECK n P265 PLUG CONTACTORS AND RELAYS P265 P260 24V COMMON EQUIPMENT GROUND NOTE USE COPPER CONDUCTORS ONLY 411 120 V FIELD PROVIDED POWER SUPPLY IS 4 REQUIRED USED ON TWO SPEED HIGH EFFICIENCY SINGLE SPEED AND M VOLT MOTOR UNITS N 120 60 1 A K37 AND S135 ARE USED ON TWO SPEED MOTOR UNITS ONLY 1268 1 3 AND 1268 2 4 ARE CONNECTEDON UNITS WITHOUT HUMIDITROL PHASE DETECTION OPTIONS MOVE WIRE FROM 240 208 ON 1 EXTERNAL HUMIDITROL CONTACTS OR 743 TRANSFORMER FOR 208 LINE VOLTAGE APPLICATIONS 849 IS PART OF 5VDC CIRCUIT
84. h in 1 10 X 10 1 10 X 10 1 11 X 10 Filters Type of filter disposable Number and size in 4 16 X 20 X 2 4 20 20 2 Electrical characteristics 208 230V 60 hz 1 phase 208 230V 460V or 575V 60 hz 3 phase NOTE Net capacity includes evaporator blower motor heat deduction Gross capacity does not include evaporator blower motor heat deduction 1 AHRI Certified to Standard 210 240 95 F outdoor air temperature and 80 F db 67 F wb entering evaporator air minimum external duct static pressure Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required Maximum usable output of motors furnished are shown In Canada nominal motor output is also maximum usable motor output If motors of comparable output are used be sure to keep within the service factor limitations outlined on the motor nameplate Page 5 SPECIFICATIONS BELT DRIVE General Data Nominal Tonnage 3 Ton 4 5 Ton 6 Ton Model Number LGH036S4T LGH048S4T LGH060S4T LGH072H4B Efficiency Type Standard Standard Standard High Blower Type Two Speed Two Speed Two Speed Single Speed Belt Drive Belt Drive Belt Drive Belt Drive Cooling Gross Cooling Capacity Btuh 35 800 50 100 61 600 73 500 Performance Net Cooling Capacity Btuh 1 84 800 149 000 160 000 272 000 AHRI Rated Air Flow cfm 1200 1600 1750 1920 Total Un
85. h unit is equipped with a low temperature switch freezestat located on a return bend of each evaporator coil The freezestat is wired to the A55 Unit Controller The freezestat is a SPST N C auto reset switch which opens at 29 F 3 F 1 7 C 1 7 C on a temperature drop closes at 58 F 4 F 14 4 C 2 2 C on a temperature rise To prevent coil icing freezestats open during com pressor operation to temporarily disable the respective compressor until the coil temperature rises If the freezestats are tripping frequently due to coil icing check the airflow filters economizer position and unit charge before allowing unit back in operation Make sure to eliminate conditions which might promote evap orator ice buildup 3 High Pressure Switch S4 The high pressure switch is a auto reset SPST N C switch which opens on a pressure rise S4 is located in the compressor discharge line and wired to the A55 Unit Controller When discharge pressure rises to 640 10 psig 4412 69 kPa indicating a problem in the system the switch opens and the respective compressor is de energized the economizer can continue to operate The switch au tomatically resets at 475 10 psig 4 Low Ambient Switch S11 The low ambient switch is used to maintain cooling op eration during low ambient temperatures The switch opens to de energize the outdoor fan via A55 while me chanical cooling continues to operate The reduced heat t
86. he cooling season Condenser coils are made of single and two formed slabs On units with two slabs dirt and debris may become trapped between the slabs To clean between slabs care fully separate coil slabs and wash them thoroughly See fig ure 19 Flush coils with water following cleaning Note Remove all screws and gaskets prior to cleaning pro cedure and replace upon completion H Supply Blower Wheel Annually inspect supply air blower wheel for accumulated dirt or dust Turn off power before attempting to remove ac cess panel or to clean blower wheel CLEAN CONDENSER COIL ENDPLATE IS SECURED TOP VIEW SUPPLY AIR x lt 2 c a BLOWER CONDENSER ACCESS PANEL Remove unit top panel and condenser section access panel Remove screws securing coil end plate to mullion Remove wire ties connecting coils slabs and separate slabs 3 4 76 102mm Clean coils with detergent or commercial coil cleaner Rinse thoroughly with water and reassemble Use field provided wire ties to connect coil slabs CONDENSER E COILS FIGURE 19 Page 45 VII ACCESSORIES The accessories section describes the application of most of the optional accessories which can be factory or field installed to the LGH units A C1 T1CURB When installing the LGH units on a combustible surface for downflow discharge applications the Lennox C1 T1CURB 8 inch 14 inch 18 inch or 24 inch height roof
87. he spark electrode and the flame sensing electrode At the start of the ignition sequence the adjustable 40 second default indoor blower delay period begins Sparking stops immediately after flame is sensed or at the end of the 8 second trial for ignition If flame is not sensed the ignition control will wait 5 min utes before attempting ignition again The unit will usually ignite on the first trial and A3 allows three trials for ignition before locking out The lockout time is 1 hour After lockout the ignition control automatically resets and provides three more attempts at ignition Manual reset after lockout re quires holding the 55 Unit Controller left arrow key until the Unit Controller resets See the Unit Controller manual provided with the unit Once the flame is sensed the ignition control then pro ceeds to steady state mode where all inputs are moni tored to ensure the limit switch rollout switch and prove switch are closed as well as flame is present When the heat call is satisfied the gas valve and combustion air in ducer are de energized An adjustable 120 second de fault blower off delay begins UTEC IGNITION CONTROL A3 SPARK IGNITDR E ODF 522 im Gi FIGURE 7 Page 28 B Cooling Components All units use independent cooling circuits consisting of sepa rate compressor condenser coil and evaporator coil See f
88. heck voltage at the disconnect switch Voltage must be within the range listed on the nameplate If not con sult the power company and have the voltage cor rected before starting the unit 5 Recheck voltage and amp draw with unit running If voltage is not within range listed on unit nameplate stop unit and consult power company Refer to unit nameplate for maximum rated load amps 6 Inspect and adjust blower belt see section on Blower Compartment Blower Belt Adjustment B Heating Start up FOR YOUR SAFETY READ BEFORE LIGHTING AWARNING Electric shock hazard Can cause injury or death Do not use this unit if any part has been under water Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and any gas control which has been under water AWARNING Danger of explosion Can cause injury product property damage If over heating occurs or if gas supply fails to shut off shut off the manual gas valve to the appliance before shutting off electrical supply Page 37 AWARNING Electric shock hazard Can cause injury or death Before attempting to perform any service or maintenance turn the electrical power to unit OFF at disconnect switch es Unit may have multiple power supplies AWARNING SMOKE POTENTIAL The heat exchanger in this unit could be a source of smoke on initial firing Take precautions with respect to building occ
89. igure 8 One draw through type condenser fan is used in LGH036 072 units Units are equipped with belt drive or di rect drive blowers which draw air across the evaporator dur ing unit operation Cooling may be supplemented by a factory or field installed economizer The evaporator coil is slab type and uses a thermostatic expansion valve as the primary refriger ant metering device Each evaporator is also equipped with enhanced fins and rifled tubing In all units each compressor is protected by a freezestat S49 on the evaporator coil a high pressure switch S4 on the discharge line and a low pres sure switch S87 on the suction line See figure 8 A low am bient switch S11 is standard 1 Compressor B1 All LGH036 060 units use one two stage scroll compres sor LGH072 units use one single stage scroll compressor See SPECIFICATIONS and ELECTRICAL table of contents or compressor nameplate for compressor spec ifications WARNING Electrical shock hazard Compressor must be grounded Do not operate without protective cover over terminals Disconnect power before removing protective cover Discharge capacitors before ser vicing unit Failure to follow these precautions could cause electrical shock resulting in injury or death Each compressor is energized by a corresponding com pressor contactor NOTE Refer to the wiring diagram section for specific unit operation 2 Freezestat S49 Eac
90. it Controller located in the main control box supplies thermostat components with 24VAC ECONOMIZER DESCRIPTION COMPONENT A 3 33 JACK UNIT ECONOMIZER JACK SENSOR OUTDOOR ENTHALPY JACK ENTHALPY SENSOR NF24 SR AF24 SR RANGE 2 10 VDC RANGE 2 10 VDC DELETE A7 AND A62 IF USED FOR NOTE THIS DIAGRAM USED ONLY EITHER GLOBAL ENTHALPY OR WHEN ECONOMIZER OR MOTORIZED SENSIBLE TEMPERATURE CONTROL OUTDOOR AIR DAMPERS ARE FOR UNIT DIFFERENTIAL ENTHALPY INSTALLED CONTROL ADD 62 RETURN AIR ENTHALPY SENSOR DESIGNATES OPTIONAL WIRING CLASS II FIELD WIRING OPTIONAL EXHAUST DAMPER ACTUATOR ENERGY RECOVER WHEEL HOORUP TO HOLD EXHAUST DAMPER CLOSED WHEN OUTSIDE AIR DAMPER IS CLOSED WIRING DIAGRAM 118 USED ON 35 TO 50 TON ENERGENCE UNITS WITH ENERGY RECOVERY WHEEL ERW ACCESSORIES REPOSITION A7 ENTHALPY SENSOR FROM ENERGENCE SERIES ECONOMIZER AND MOTORIZED OAD ROOFTOP UNIT ECONOMIZER INTO INTAKE PIVOTING WHEEL ENERGY RECOVERY SYSTEM OPTION HOOD OF THE ERW ROOFTOP UNIT SECTION D REMOVE JUMPER WHEN INSTALLING Supersedes New Form No OPTIONAL LOW AMBIENT SWITCH 537189 01 upi Lennox Commercial SEQUENCE OF OPERATION POWER 1 55 Unit Controller energizes the economizer components with 24VAC OPERATION Sensor s a global input or a communication signal communicates to A55 when to power the damp er motor B7 A55 supplies B7 with 0 10 VDC to control the positionin
91. it Power kW 3 0 4 1 4 8 6 0 SEER Btuh Watt 115 0 115 0 115 5 EER Btuh Watt 111 6 112 5 112 5 12 0 IEER Btuh Watt 213 5 Refrigerant Type R 410A R 410A R 410A R 410A Refrigerant Charge Furnished 9 Ibs 1 oz 11 Ibs 5 oz 15 Ibs 8 oz 16 Ibs 5 oz Refrigerant Charge Furnished 9 Ibs 12 oz 12 165 7 oz 17 Ibs 8 oz 16 Ibs 5 oz with Humiditrol Option Gas Heating Options Available See page 7 Standard Standard Standard Standard 1 stage or 1 stage 1 stage 1 stage Medium Medium Medium Medium 1 or 2 stage 1 or 2 Stage 1 or 2 Stage 1 or 2 Stage or High or High or High 1 or 2 Stage 1 or 2 Stage 1 or 2 Stage Compressor Type number Scroll 1 Scroll 1 Scroll 1 Scroll 1 Outdoor Coils Net face area total sq ft 15 60 15 60 19 30 19 30 Tube diameter in 3 8 3 8 3 8 3 8 Number of rows 1 5 2 2 2 Fins per inch 20 20 20 20 Outdoor Coil Motor No horsepower 1 1 6 PSC 1 1 4 PSC 1 1 3 PSC 1 1 3 PSC Fans Motor rpm 825 825 1075 1075 Total Motor Input watts 168 230 410 410 Diameter No in 1 24 1 24 1 24 1 24 Number of blades 3 3 3 3 Total air volume cfm 3 000 3 300 4 800 4 800 Indoor Net face area total sq ft 7 78 7 78 9 72 9 72 Coils Tube diameter in 3 8 3 8 3 8 3 8 Number of rows 3 4 4 4 Fins per inch 14 14 14 14 Drain connection Numb
92. l of active mold growth Existing mold growth must be appropri ately removed PRIOR to installation of the germicidal lamp Refer closely to UVC light installation instruction warnings when servicing units l Optional Cold Weather Kit An electric heater is available to automatically control the minimum temperature in the gas burner compart ment Heater is C S A certified to allow cold weather op eration of unit down to 60 F 50 C The kit includes the following parts 1 The strip heater HR6 is located as close as possible to the gas valve The strip heater is rated at 500 Watts 2 Athermostat mounting box is installed on the wall of the compressor compartment Included in the box are the following thermostat switches Thermostat switch 559 is an auto reset SPST switch which opens on a temperature drop The switch is wired in series with 24v power and the com bustion air blower switch When the temperature drops below 30 F 35 C the switch opens and the gas heat section is de energized The switch automati cally resets when the heating compartment tempera ture reaches 10 F 129 b Thermostat switch S60 is an auto reset SPST N C switch which opens on a temperature rise The switch is wired in series with HR6 When the temperature rises above 20 F 7 C the switch opens and the electric heater is de energized The switch automatically resets when the heating compartment temperature reach
93. lectrical power to the appliance 3 Open or remove the heat section access panel Page 38 4 Honeywell VR8205 Gas Valve with ON OFF Lever Switch gas valve lever to OFF Honeywell VR8205 Gas Valve with Knob Turn knob on gas valve clockwise aff to OFF Do not force 5 Close or replace the heat section access panel C Cooling Start up Operation 1 Initiate first and second stage cooling demands ac cording to instructions provided with thermostat 2 No Economizer Installed in Unit A first stage cooling demand Y 1 will energize first stage compressor and the condenser fan low Speed on direct drive blowers An increased cool ing demand Y2 will energize second stage com pressor and condenser fan high speed on units with direct drive blowers Units Equipped With Economizer When outdoor air is acceptable a first stage cooling demand Y1 will energize the economizer An in creased cooling demand Y2 will energize first stage compressor and and the condenser fan low Speed on units with direct drive blowers When out door air is not acceptable unit will operate as though no economizer is installed Units contain one refrigerant circuit Unit is charged with R 410A refrigerant See unit rating plate for correct amount of charge Refer to Cooling Operation and Adjustment section for proper method to check refrigerant charge 1 1 Three Phase Scroll Compressor Voltage Phasing Three pha
94. lined on the motor nameplate Blower wheel nominal diameter x width in Filters Type of filter Number and size in Page 6 SPECIFICATIONS GAS HEAT Model LGH036 LGH036 LGH072 LGH036 LGH072 LGH048 LGH072 LGH048 LGH072 LGHO048 LGH048 LGH048 Heat Input Type Standard Medium Medium High High 1 Stage 1 Stage 2 Stage 1 Stage 2 Stage Input 1st Stage 65 000 105 000 73 500 150 000 105 000 Btuh 2nd Stage 105 000 150000 Output 1st Stage 52 000 84 000 59 000 120 000 85 500 Btuh 2nd Stage 84 000 Tm 120 000 Temperature 1iststage 20 50 25 70 20 50 15 55 10 40 40 85 30 60 25 65 20 50 Rise 2ndStage 212 72527011 20 50 40 85 30 60 AFUE 80 80 80 80 80 80 80 80 80 Thermal 151 Stage 80 80 80 80 80 80 80 81 5 81 5 Efficiency 2nd Stage um m 80 80 m 80 80 Gas Supply Connections 1 2 in NPT Rec Gas Supply Pressure Nat LPG 7 in w g 11 in w g 1 Annual Fuel Utilization Efficiency based on U S DOE test procedures and FTC labeling regulations HIGH ALTITUDE DERATE NOTE Units may be installed at altitudes up to 2000 ft above sea level without any modifications At altitudes above 2000 ft units must be derated to match information in the table shown At altitudes above 4500
95. low cfm 1200 1600 1750 Total Unit Power kW 2 8 3 8 4 7 1 SEER Btuh Watt 208 230V 1 3ph 18 0 17 6 17 1 1 SEER Btuh Watt 460V 3ph 575V 3ph 17 0 17 0 17 0 1 EER Btuh Watt 12 7 12 8 12 7 Refrigerant Type R 410A R 410A R 410A Refrigerant Charge Furnished 9 Ibs 1 oz 11 Ibs 5 oz 15 Ibs 8 oz Refrigerant Charge Furnished 9 Ibs 12 oz 12 165 7 oz 17 Ibs 8 oz with Humiditrol Option Gas Heating Options Available See page 7 Standard Standard Standard 1 stage or 1 stage 1 stage Medium Medium Medium 1 or 2 stage 1 or 2 Stage or 1 or 2 Stage or High High 1 or 2 Stage 1 or 2 Stage Compressor Type number Scroll 1 Scroll 1 Scroll 1 Outdoor Coils Net face area total sq ft 15 60 15 60 19 30 Tube diameter in 3 8 3 8 3 8 Number of rows 1 5 2 2 Fins per inch 20 20 20 Outdoor Coil Motor No horsepower 1 1 3 ECM 1 1 3 ECM 1 1 3 ECM Fans Motor rpm 715 810 645 810 930 1100 Total Motor Input watts 112 160 89 165 230 350 Diameter No in 1 24 1 24 1 24 Number of blades 3 3 3 Total air volume cfm 3400 3795 2910 3675 4315 4980 Indoor Net face area total sq ft 7 78 7 78 9 72 Coils Tube diameter in 3 8 3 8 3 8 Number of rows 3 4 4 Fins per inch 14 14 14 Drain connection Number and size in 1 1 NPT 1 1 NPT 1 1 NPT Expansion device type Balance port TXV removable head 2 Indoor Nominal motor HP 0 50 ECM 0 75 ECM 1 ECM Blower Blower wheel nominal diameter x widt
96. lve GV1 on first stage Second Stage Heat 6 With first stage heat operating an additional heating demand from the thermostat initiates W2 7 stage heating demand is received by A55 8 55 energizes HI terminal high fire of gas valve 9 Relay K72 1 terminals 1 and 7 open 7 and 4 close K72 2 terminals 6 and 9 close and 9 and 3 open energiz ing combustion air inducer B6 on high speed End of Second Stage Heat 10 Heating demand is satisfied Terminal HI second stage is de energized 11 Second stage heat is de energized on GV1 A55 12 K72 terminals 4 and 7 open and 1 and 7 close K72 terminals 6 and 9 open 9 and 3 close Combustion air inducer B6 is now on low speed End of First Stage Heat 13 Heating demand is satisfied Terminal W1 first stage is de energized 14 Ignition A3 is de energized in turn de energizing gas valve GV1 and combustion air inducer B6 Optional Low Ambient Kit C S A 50 Low Ambient Kit 15 Line voltage is routed through the N C low ambient kit thermostats S60 and S61 to energize low ambient kit heater HR6 Page 58 ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT 24 POWER TO M2 THERMOSTAT INPUTS by tae ALL OTHER THERMOSTAT SIGNALSREMAINCONNECTED AS SHOWN ON THE RIGHT 1 TOPROVIDISUPERMARKEEHEABCHEME USE S86 DEHUMIDISTAT AND K55 REQUIRES HEAT 3 COOLTHERMOSTAT AND K27 RELAY 24 V COMMON JACK RT16 RETURN AIR SENSOR J100 JACK RT
97. motor and energizes exhaust fan relay K65 with 24VAC at 50 outside air damper open adjustable 11 contact 65 1 amp 2 close energizing exhaust fan motor B10 Page 56 GAS HEAT FOR LGH036 072 UNITS c T FS1 GV1 VALVE GAS 1 o m z o o 2 5 I e E S10 NC 2 EE 5 21 C 4 TAB ss 3 9 0 510 SWITCH LIMIT PRIMARY GAS 518 SWITCH COMBUSTION AIR PROVE 1 1 als 19159 majojo TSTAT OPEN 50F CLOSE 20F TRANSFORMER COMB AIR BWR 1 24 VCOMMON 65 105 150 150 LP CONVERSION SINGLE STAGE TWO STAGE DENOTES OPTIONAL COMPONENTS TWO STAGE WIRING DIAGRAM HEATING GAS HEAT LGH 65 150 STAGE UNITS 537179 01 Lennox Commercial CSA 50C LOW AMBIENT KIT OPTIONAL T3 USED ON 460V AND 575 V UNITS ONLY Page 57 GAS HEAT SEQUENCE OF OPERATION First Stage Heat The thermostat initiates W1 heating demand 24VAC is routed to A55 Unit Controller After A55 proves N C primary limit S10 the combustion air blower relay K13 is energized N O K13 1 contacts close allowing voltage to energize combustion air inducer B6 After B6 has reached full speed the combustion air blower proving switch S18 contact close 55 routes 24VAC through n c burner flame rollout switch S47 and the closed contacts of combustion air proving switch 518 to energize the ignition module After a 30 second delay energizes the ignitor and gas va
98. mounting frame is used The roof mounting frames are recom mended in all other applications but not required If the LGH units are not mounted on a flat roof surface they MUST be supported under all edges and under the middle of the unit to prevent sagging The units MUST be mounted level with in 1 16 per linear foot or 5mm per meter in any direction The assembled mounting frame is shown in figure 20 Re fer to the roof mounting frame installation instructions for details of proper assembly and mounting The roof mount ing frame MUST be squared to the roof and level before mounting Plenum system MUST be installed before the unit is set on the mounting frame Typical roof curbing and flashing is shown in figure 21 Refer to the roof mounting frame installation instructions for proper plenum construc tion and attachment B Transitions Optional supply return transitions T1TRAN10AN1 is available for use with the LGH 3 4 and 5 ton units and the T1TRAN20N 1 is available for the 6 ton units utilizing op tional T1CURB roof mounting frames Transition must be installed in the C1 T1CURB mounting frame before mounting the unit to the frame Refer to the manufacturer s instructions included with the transition for detailed installa tion procedures ASSEMBLED ROOF MOUNTING FRAME FIGURE 20 TYPICAL FLASHING DETAIL UNIT BASE BOTTOM UNIT BASE RAIL FIBERGLASS INSULATION Furnished COUNTER FLASHING NAILE
99. n The switch is N O and closes at 1 W C 248 6 Pa The switch is mounted in the supply air section on the evaporator coil seal M Indoor Air Quality Sensor 63 The indoor air quality sensor monitors levels and re ports the levels to the Unit Controller The Unit Controller ad justs the economizer dampers according to the levels The sensor is mounted next to the indoor thermostat or in the return air duct Refer to the indoor air quality sensor installa tion instructions for proper adjustment N LP Propane Kit All units operated on LP Propane require a natural to LP propane kit The kit for single stage units include one LP spring seven bumer orifices and three stickers Two stage kits include the same but has a prove switch used to lock out first stage on the combustion air inducer For more detail refer to the natural to LP gas changeover kit installation instructions O Drain Pan Overflow Switch 5149 optional The overflow switch is used to interrupt cooling operation when excessive condensate collects in the drain pan The N O overflow switch is controlled by K220 and DL46 relays located in the unit control panel When the overflow switch closes 24VAC power is interrupted and after a five second delay unit compressors are de energized Once the conden sate level drops below the set level the switch will open Af ter a five minute delay the compressor will be energized P SunSource Commerci
100. ompressor Rated Load Amps 16 7 11 2 4 5 3 7 Locked Rotor Amps 82 58 29 22 5 Outdoor Fan Full Load Amps 4 1 4 1 24 1 6 Motor Power Exhaust Full Load Amps 2 4 2 4 13 1 1 0 33 HP Service Outlet 115V amps 15 15 15 15 Indoor Blower Horsepower 0 5 0 5 0 5 0 5 Motor Full Load Amps 4 3 4 3 2 2 1 7 2 Maximum Unit Only 45 30 15 15 Overcurrent With 1 0 33 HP 45 35 15 15 Protection Power Exhaust 3 Minimum Unit Only 30 23 10 8 Circuit With 1 0 33 HP 32 25 12 9 Ampacity Power Exhaust 1 Extremes of operating range are plus and minus 10 of line voltage 2 HACR type breaker or fuse 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements 3 TON STANDARD EFFICIENCY R 410A LGH036S4 Voltage 60hz 208 230V 3 Ph 460V 3 Ph 575V 3 Ph Compressor Rated Load Amps 11 2 4 5 3 7 Locked Rotor Amps 58 29 22 5 Outdoor Fan Full Load Amps 0 9 0 6 0 5 Motor Power Exhaust Full Load Amps 2 4 1 3 1 1 0 33 Service Outlet 115V GFI amps 15 15 Indoor Blower Horsepower 0 75 1 0 75 1 0 75 1 Motor Full Load Amps 3 5 46 1 6 2 1 1 3 1 7 2 Maximum Unit Only 25 30 15 15 15 Overcurrent With 1 0 33 HP 30 30 15 Is 15 Protection Power Exhaust 3 Minimum Unit Only 19 20 8 9 7 Circuit With 1 0 33 HP 21 22 10 10 8 Ampacity Power Exhaust 1 Extremes of operating range plus and minus 10 of line voltage 2 HACR type breaker or fuse 3 Refer to National or Canadian Ele
101. on window to the right of the amp setting control Press the blue reset screw to reset the relay The red STOP button opens the normally closed contacts which power the blower motor This button stops blower motor operation as long as it is pressed in FIGURE 4 SIEMENS OVERLOAD RELAY BLUE RESET BUTTON IN FACTORY SET AUTO MODE Turn clockwise to H for manual reset GREEN TRIP INDICATOR Flush with surface not tripped Above surface tripped RED TEST BUTTON AMP ADJUSTMENT DIAL Adjust relay amp setting according to value given on the blower motor nameplate Proper relay amp setting equals motor nameplate FLA X Use small slotted screwdriver to adjust control mode from automatic reset A to manual reset H Control must be in the manual reset mode H to perform a test Press the red test button Green trip indicator should pop out Press the blue reset screw to reset the relay FIGURE 5 Page 27 13 Burner Control A3 AWARNING Shock hazard Spark related compo nents contain high voltage which can cause personal injury or death Discon nect power before servicing Control is W not field repairable Unsafe operation will result If control is inoperable sim ply replace the entire control The main control box figure 7 houses the burner control A3 The ignition control provides three main functions gas valve control ignition and flame sensing The control has a green LED to show control status
102. or further details Do not use matches candles flame or any other source of ignition to check for gas leaks 3 Testing Gas Supply Pressure When testing gas supply pressure connect test gauge to the inlet pressure tap located on unit gas GV1 Test supply gas pressure with unit firing at maximum rate both stages energized Make sure the reading falls within the range of the following values Low pressure may result in erratic operation or under fire High pressure can result in permanent damage to the gas valve or over fire For natu ral gas units operating pressure at the unit gas connection must be between 4 5 W C and 10 5 W C For L P gas units operating pressure at the unit gas connection must be between 10 5 W C and 13 0 W C On multiple unit installations each unit should be checked separately while operating at maximum rate beginning with the one closest to the supply gas main and progressing to the one furthest from the main Multiple units should also be tested with and without the other units operating Supply pressure must fall within the range listed in the previous paragraph 4 Check and Adjust Manifold Pressure After line pressure has been checked and adjusted check manifold pressure Move test gauge to the outlet pressure tap located on unit gas valve GV1 See figure 15 or 16 for location of pressure tap on the gas valve The manifold pressure is factory set and should not re quire adjus
103. ot suitable during the unoccupied time period damper modulates closed Cooling Thermostat or Zone Sensor Up to 2 stages Y 1 Y2 Y1 demand 1st Compressor is off supply fan is on economizer modulates minimum to maximum open position to maintain 55 F supply air temperature default unit controller setting Y2 demand 1st Economizer goes to maximum open position and if the damper stays open for three minutes default unit controller setting the compressor is energized Page 51 F Power Exhaust Relay K65 power exhaust units Power exhaust relay K65 is a DPDT relay with a 24VAC coil K65 is used in all LGH units equipped with the op tional power exhaust dampers K65 is energized by the Unit Controller after the economizer dampers reach 50 open adjustable When K65 closes exhaust fan B10 is energized G Power Exhaust Fans E1PWRE10A available for LGH 3 and 4 ton units and ET1PWRE10N available for 5 and 6 ton units provide ex haust air pressure relief See figure 27 and installation in structions for more detail H Optional UVC Lights The Healthy Climate germicidal light emits ultraviolet UVC energy that has been proven effective in reducing microbial life forms viruses bacteria yeasts and molds in the air UVC germicidal lamps greatly reduce the growth and prolif eration of mold and other bio aerosols bacteria and vi ruses on illuminated surfaces Germicidal lamps are NOT intended to be used for remova
104. ransfer across the outdoor coil results in higher refriger ant temperatures and prevents indoor coil icing The low ambient switch is an auto reset SPST N O pres sure switch and is located in the liquid line prior to the in door coil section The switch is wired to the A55 Unit Controller which uses the 511 input to control the out door fan when outdoor temperatures drop below 62 F 511 opens when the liquid pressure drops below 240 10 psig 1655 69 kPa S11 closes when the liquid pres sure rises to 450 10 psig 3102 69 kPa psig The S11 switch will continue to cycle the outdoor fan until the out door temperature rises to 65 F Units Equipped With Direct Drive Blowers When the liquid pressure rises to 450 psig the outdoor fan is energized at extra low RPM This reduces the number of outdoor fan on off cycles and refrigerant pressure fluctua tions The outdoor fan will continue to operate at extra low RPM until the outdoor temperature rises to 65 F 5 Low Pressure Switch S87 The compressor circuit is protected by a loss of charge switch located on the suction line Switch opens at 40 psig 5 psig 276 34 kPa and automatically resets at 90 psig 5 psig 621 kPa kPa 6 Crankcase Thermostat S40 Switch opens when discharge line temperature reaches 94 F 5 34 C 3 and closes when temperature falls below 74 F 5 23 C 3 Prevents crankcase heater operation in warm weather Page 29 LGH PLUMBING and S49
105. ring Air Temp 10 psig psig 26 39 er __ Wer 48 TABLE 23 LGH072H NORMAL OPERATING PRESSURES Entering Air Temp 10 psig psig 2 0 3r 405 TABLE 24 LG072H REHEAT NORMAL OPERATING PRESSURES Outdoor Coil Discharge Suction 5 Entering Air Temp 10 psig psig e 35 99r 49 __ ner 507 D Charge Verification Approach Method AHRI Testing 1 Using the same thermometer compare liquid tempera ture to outdoor ambient temperature Approach Temperature Liquid temperature at con denser outlet minus ambient temperature 2 Approach temperature should match values in table 25 An approach temperature greater than value shown indicates an undercharge An approach tem perature less than value shown indicates an over charge 3 The approach method is not valid for grossly over or undercharged systems Use tables 11 through 24 as a guide for typical operating pressures TABLE 25 APPROACH TEMPERATURE LGH LCH Unit Liquid Temp Minus Ambient Temp 036S amp H Std 036S amp H Reheat 048H Std 060S amp H Reheat 060 Std 072H Std 048H Reheat 072H Reheat 048S Std 0605 Std 048S Reheat 6 F 1 3 3 C 0 5 TF 1 3 9 05 8 F 1 4 4 C 05 9 1 5 0 0 5 Page 41 V SYSTEMS SERVICE CHECKS A Heating System Service Checks All LGH
106. s air resistance duct resistance diffuser etc See page 19 for blower motors and drives and wet coil and options accessory air resistance data DOWNFLOW Air Volume cfm External Static in w g 0 20 0 30 0 60 0 70 0 9 1 0 RPM RPM RPM BHP RPM BHP RPM BHP RPM BHP BHP 900 502 0 12 573 10 15 644 0 19 725 0 22 802 0 24 861 0 26 908 0 29 957 0 32 1009 0 34 1061 0 37 1000 528 0 14 598 0 18 668 0 22 747 0 24 821 0 27 877 0 3 923 0 33 971 0 35 1022 0 38 1074 0 4 1100 557 0 17 626 0 21 695 0 25 112 0 28 841 0 3 894 0 33 939 0 36 986 0 39 1037 0 41 1087 0 44 1200 1300 589 625 0 21 0 25 657 0 25 692 0 28 725 0 28 759 0 32 798 827 0 31 0 34 864 887 0 33 0 37 913 0 37 933 0 41 956 0 4 975 0 44 1003 0 43 1021 0 47 1052 1068 0 45 0 49 1100 0 48 1115 0 52 1400 665 0 29 730 0 32 794 0 35 857 0 38 911 0 42 953 0 45 995 0 49 1040 0 52 1086 0 54 1131 0 57 1500 706 0 33 768 0 36 829 0 39 886 0 43 934 0 46 974 0 5 1015 0 54 1060 0 56 1105 0 59 1149 0 62
107. s fastened to burner supports and can be removed for service without removing any part of the burners When flame is sensed by the flame sensor indicated by microamp signal through the flame sparking stops imme diately or after the eight second trial for ignition During op eration flame is sensed by current passed along the ground electrode located on the spark electrode through the flame and into the sensing electrode The igni tion control allows the gas valve to stay open as long flame signal current passed through the flame is sensed SIDE VIEW SENSOR Gas Flow gt 20 FIGURE 14 AND INSTALLATION Make sure the unit is installed in accordance with the installation instructions and all applicable codes See accessories section for conditions requiring use of the optional roof mounting frame T1CURB AN or C1CURB AN 11 5 UP OPERATION A Preliminary and Seasonal Checks 1 Make sure the unit is installed in accordance with the installation instructions and applicable codes 2 Inspect all electrical wiring both field and factory installed for loose connections Tighten as required Refer to unit diagram located on inside of unit compressor access pan el 3 Check to ensure that refrigerant lines are in good condition and do not rub against the cabinet or other refrigerant lines 4 C
108. se scroll compressors must be phased se quentially to ensure correct compressor and blower rota tion and operation Compressor and blower are wired in phase at the factory 1 Observe suction and discharge pressures and blower rotation on unit start up 2 Suction pressure must drop discharge pressure must rise and blower rotation must match rotation marking pressure differential is not observed or blower rotation is not correct 3 Disconnect all remote electrical power supplies 4 Reverse any two field installed wires connected to the line side of K1 contactor Do not reverse wires at blower contactor 5 Make sure the connections are tight Discharge and suction pressures should operate at their normal start up ranges D Safety or Emergency Shutdown Turn off power to unit Close manual and main gas valves IV CHARGING WARNING Do not exceed nameplate charge under any condition This unit is factory charged and should require no further adjustment If the system requires additional refrigerant re claim the charge evacuate the system and required nameplate charge NOTE System charging is not recommended below 60 F 15 C In temperatures below 60 F 15 C the charge must be weighed into the system If weighing facilities are not available or to check the charge use the following procedure 1 Attach gauge manifolds and operate unit in cooling mode with economizer disabled until system
109. tatic in w g Air Volume 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 9 1 0 cfm RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 700 440 0 07 510 0 1 585 0 12 657 0 14 726 0 17 793 0 2 856 0 23 915 0 25 967 0 28 1016 0 31 800 456 0 08 526 0 11 600 0 14 672 0 16 739 0 19 804 0 22 866 0 25 923 0 28 975 0 31 1025 0 34 900 474 0 1 544 0 13 617 0 16 688 0 18 754 0 21 818 0 24 877 0 27 932 0 3 984 0 33 1034 0 36 1000 495 0 12 565 0 15 637 0 18 707 0 21 771 0 23 832 0 27 889 0 3 943 0 33 1100 518 0 14 588 0 18 659 0 21 727 0 23 789 0 26 848 0 3 903 0 33 954 0 37 1200 544 0 17 613 0 21 682 0 24 748 0 27 809 0 29 866 0 33 918 0 37 967 0 4 993 1003 1014 0 36 0 4 0 43 1043 1052 1062 0 39 0 43 0 46 1300 572 0 21 640 0 24 707 0 27 771 0 3 830 0 33 884 0 37 934 0 41 981 0 44 1027 0 47 1073 0 5 1400 602 0 24 669 0 28 733 0 31 795 0 34 851 0 37 903 0 41 950 0 45 995 0 49 1040 0 52 1086 0 55 External Static in w g Air Volume 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 cfm
110. ters as shown in the Unit Controller manual provided with each unit Motors are equipped with sealed ball bearings All motor specifications are listed the SPECIFICATIONS table of contents in the front of this manual Units may be equipped with motors manufactured by various manufacturers therefore electri cal FLA and LRA specifications will vary See unit rating plate for information specific to your unit AIMPORTANT Three phase scroll compressors must be phased se quentially for correct compressor and blower rota tion Follow COOLING START UP section of instal lation instructions to ensure proper compressor and blower operation A Blower Operation Refer to the Unit Controller Installation and Setup Guide to energize blower Use the menu navigation arrows and se lect button see Service Test B Determining Unit CFM 1 The following measurements must be made with air fil ters in place IMPORTANT On units equipped with direct drive blowers determine and adjust high speed CFM before low speed CFM Low speed CFM should be adjusted to 2 3 of high speed CFM A low speed adjustment less than 2 3 of high speed will improve humidity removal refer to product data for more information 2 With all access panels in place measure static pres sure external to unit from supply to return Pressure tap locations should be approximately one foot from openings 3 Measure the indoor blower wheel RPM RPM can
111. tings may vary by manufacturer Specific inducer electrical ratings can be found on the unit rating plate On a heating demand W1 the 55 Unit Controller through the ignition control A3 initiates the heating cycle A3 then allows 30 to seconds for the combustion air inducer to vent exhaust gases from the burners When the combustion air induc er is purging the exhaust gases the combustion air prove switch closes proving that the combustion air inducer is oper ating before allowing the ignition sequence to continue When the combustion air prove switch is closed and the delay is over the A55 Unit Controller through the ignition control activates the appropriate stage operator of the gas valve the spark and the flame sensing electrode Sparking stops immediate ly after flame is sensed or at the end of the eight second trial for ignition On two stage natural gas units the inducer will operate on low speed for first stage heat W1 and ramp up to high speed for second stage heat W2 All combustion air inducer motors are sealed and cannot be oiled The inducer cannot be adjusted but can be re moved from the heat section for cleaning 7 Combustion Air Motor Capacitor C3 The combustion air inducer motors in all LGH units re quire run capacitors Capacitor C3 is connected to com bustion air inducer B6 Ratings will be on side of capaci tor or combustion air motor nameplate 8 Gas Valves GV1 Units are equipped with a single or
112. tment See table 9 If manifold pressure is incorrect and no other source of improper manifold pressure can be found the valve must be replaced See figure 15 or 16 for loca tion of gas valve manifold pressure adjustment screw All gas valves are factory regulated The gas valve should completely and immediately cycle off in the event of gas or power failure The manual shut off knob switch can be used to immediately shut off gas supply CAUTION For safety connect a shut off valve between the manometer and the gas tap to permit shut off of gas pressure to the manometer Manifold Adjustment Procedure 1 Connect test gauge to the outlet pressure tap on the gas valve Start the unit call for second stage heat and allow five minutes for the unit to reach steady state 2 While waiting for the unit to stabilize notice the flame The flame should be stable without flashback and should not lift from the burner heads Natural gas should burn basically blue with some clear streaks L P gas should burn mostly blue with some clear yellow streaks 3 After allowing the unit to stabilize for five minutes re cord the manifold pressure and compare to the values given in table 9 On two stage units check low fire make adjustments and recheck high fire before re cording values Page 42 Combustion gases Flue products must be analyzed and compared to the unit specifications Problems detected during the inspection may make it n
113. ture Y2 demand 1st Compressor is off supply fan is on high speed and economizer modulates to maintain 55 F supply air temperature 2nd Economizer opens to maximum If economizer stays at maximum open for 3 minutes default unit controller setting compressor is energized and operates at first stage while supply fan stays on high speed Outdoor air suitability is determined by the energy state of outdoor ambient enthalpy or sensible and its ability to achieve the desired free cooling effects Outdoor air suitability can also be determined by a third party controller and provided to the RTU via a network connection Y3 demand 1st Economizer is at maximum open and compressor operates at first stage If economizer stays at maximum open for 3 minutes default unit controller setting compressor switches to second stage operation while supply fan stays on high speed Page 50 Outdoor Air Damper and Economizer Operation continued SINGLE STAGE UNIT OPERATION 6 Modulating Outdoor Air Damper Damper minimum positions are adjusted during unit setup to provide minimum fresh air requirements at the indicated supply fan speeds per ASHRAE 62 1 Supply fan is off and the outdoor air damper is closed Supply fan is on and the outdoor air damper is at minimum position 1Outdoor Air is Suitable Note When outdoor air is not suitable during the occupied time period damper modulates to minimum position When out door air is n
114. ult A55 can be programmed to direct 24VAC to blower high speed contactor K37 to energize blower B3 on high speed Direct Drive A A55 through motor control board A169 energizes blower B3 via programmed motor settings Motor settings are field adjustable First Stage Cooling A55 Unit Controller receives a Y1 and G cooling demand and energizes blower B3 low speed on two speed belt and direct drive blowers After A55 proves n c low pressure switch S87 n c freezestat S49 and n c high pressure switch S4 compres sor contactor K1 is energized N O contacts K1 1 close energizing the compressor B1 On two speed systems 3 4 and 5 tons compressor is energized on low speed A Belt Drive Blowers S11 n o contacts close below 62 F A55 energizes n o contacts K10 1 closed to start condenser fan B4 B Direct Drive Blowers S11 n o contact close below 62 F A55 through motor control board A169 energizes outdoor fan motor B4 on low speed Second Stage Cooling 8 A55 receives a Y2 and G cooling demand and energizes blower B3 high speed on two speed belt and direct drive blowers On two speed systems 3 4 and 5 ton A55 via motor control board A169 energizes compressor solenoid L34 switching compressor to high speed A Direct Drive Blowers A55 via motor control board A169 energizes outdoor fan motor B3 on high speed Power Exhaust Fan Operation 10 A55 receives a position feedback signal from the economizer damper
115. upants and property Vent initial sup ply air outside when possible BEFORE LIGHTING smell all around the appliance area for gas Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor The gas valve may be equipped with either a gas control lever or gas control knob Use only your hand to push the lever or turn the gas control knob Never use tools If the the lever will not move or the knob will not push in or turn by hand do not try to repair it Call a qualified service technician Force or attempted repair may result in a fire or explosion AWARNING Danger of explosion Can cause injury or death Do not attempt to light manually Unit has a direct spark ignition system This unit is equipped with an automatic spark ignition sys tem There is no pilot In case of a safety shutdown move thermostat switch to OFF and return the thermostat switch to HEAT to reset ignition control A Placing Unit In Operation AWARNING Danger of explosion fire Can cause injury or product or property damage You must follow these instructions exactly Ww Gas Valve Operation figures 15 and 16 1 Set thermostat to lowest setting 2 Turn off all electrical power to appliance 3 This appliance is equipped with an ignition device which automatically lights the burner Do not try to light the burner by hand 4 Open or remove the heat section access panel Honeywell VR8
116. ure 25 Optional Sensor An optional IAQ sensor A63 may be used to lower operat ing costs by controlling outdoor air based on level room occupancy also called demand control ventilation or DCV Damper minimum position can be set lower than traditional minimum air requirements dampers open to traditional ventilation requirements when level reach es DCV IAQ setpoint Refer to instructions provided with sensors for installation ECONOMIZER BOARD nnn o Myo M2 UNIT CONTROLLER 8 1 m M 3 1 STEADY YELLOW OUTDOOR NU AIR SUITABLE LED INDICATES OUTDOOR AIR CAN BE USED TMP GLO lu mex a GLO TMP FOR COOLING 0 100 MINIMUM POSITION POTENTIOMETER FIGURE 25 Page 48 DIP SWITCHES TMP GLO bi c 2 GLO TMP ODE differential TMP GLO ce P a NI D GLO TMP 5 to DIF X 2 LJ A DIF SET PNT ODE enthalpy DIF ENTH SET PNT Note All economizer modes of operation except DSET will modulate dampers to 55 F 13 C discharge air FIGURE 26 Page 49 Outdoor Air Damper and Economizer Operation
117. will be on the side of capacitor or outdoor fan motor nameplate 7 Compressor Capacitor C5 Compressor capacitor C5 is used to assist in the start up of compressor 1 in single phase units Ratings will be on the side of capacitor or compressor nameplate 8 Compressor Contactor K1 In all LGH units K1 energizes compressor B1 in response to Unit Controller demand Three phase units use three pole double break contactors with a 24 volt coil Single phase units use single pole double break contactors with a 24 volt coil 9 Blower Contactors K3 K37 belt drive K3 and K37 are three pole double break contactors with 24VAC coils On 3 4 and 5 ton units K3 energizes the B3 indoor blower motor on low speed and K37 energizes the blower motor on high speed On 6 ton units K3 energizes the B3 single stage blower motor in response to blower demand 10 Blower Overloads 542 5135 42 and S135 are three phase thermal overload relays See figure 4 or 5 Switches are connected in line with the blower motor to monitor the current flow to the motor When the relay senses current exceeds the operating limits of the motor a set of normally closed contacts open to de energize the blower On 3 4 and 5 ton unit blowers S42 is used on low speed and 135 is used on high speed On 6 ton unit blowers S42 is used on single speed Overload should be set to the full load current ratings on the motor nameplate 11 Condenser Fan Relay K10 belt drive

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