CBX32M - INNOVATION GROUP
Contents
1. SINGLE PHASE ELECTRIC HEAT CBX32M 018 024 CBX32M 030 Blower oe 31Minimum Motor Circuit Fuse Size Input Full Circuit Maximum Full Ampacity No Load Fuse Load NA T P Of Vols kW mBtuh 102 Ampacity Amps Circuit Circuit Circuit Circuit Model Number Steps Amps 2 5 kW ECB29 2 5 28K30 1 208 1 9 6 400 1 5 13 15 4 Ibs 220 2 1 7 200 1 5 15 15 Not Available 230 23 7 800 1 5 15 15 240 25 8 500 1 5 15 15 5 kW ECB29 5 28K31 1 208 3 8 12 800 1 5 24 4125 1 73 25 4125 4 Ibs Terminal Block ECB29 5CB 28K32 220 42 14 300 1 5 28 30 1 73 28 30 230 46 15 700 1 5 28 30 173 28 dass i232 240 5 0 17 100 1 5 28 30 1 73 28 30 6 kW 29 6 47122 1 208 45 15 400 1 5 29 4130 1 73 30 4130 4 Ibs Terminal Block ECB29 6CB 47L23 220 5 0 17 100 1 5 33 35 1 73 33 35 SS Circuit breaker 230 55 18 800 1 5 33 35 173 33 CORB Tags 240 6 0 20 500 1 5 33 35 1 73 33 35 8 kW 29 8 28 33 2 208 6 0 20 500 1 5 38 4140 1 73 38 4140 5 Ibs Terminal Block ECB29 8CB 28K34 220 67 22 900 1 5 44 45 1 73 44 45 495 rot breaker 230 7 3 25 100 1 5 44 45 173 dd cxi 2200 240 8 0 27 300 1 5 44 45 1 73 44 45 9 ECB29 9CB 10111 2 208 6 8 23 100 1 5 42 4145 1 73 43 4145 5 Ibs 50A Circuit breaker ECB22. Mor Maximum Rouer Cheutt gt Fuse of Full Ampacity Circuit Full Ampacity Size Steps Input Load Circuit Load Circuit Circuit Model Number Volts kW mBtuh Ams 4 2 1 2 Ams 4 2 3 4 2 3 5 kW ECB29 5 28K31 1 208 38 12800 24 26 30 cem 40 OF coc tee QO eR ee 4 lbs Terminal Block 220 42 14 300 24 29 30 40 31 35 EE E 230 46 15 700 24 29 30 40 31 35 AGUI eer 240 50 17 100 24 29 30 40 34 35 6 kW ECB29 6 47L22 _1 208 45 15400 24 30 lt MI 40 3 aac 35 nen ae 4 Ibs Terminal Block 220 50 17100 24 34 35 40 36 40 poca ted 230 55 18800 24 34 35 40 36 40 TEUR DISONS 240 6 0 20500 24 34 35 40 36 40 8 kW ECB29 8 28K33 2 208 60 20 500 24 40 4140 40 40 440 5 Ibs Terminal Block 220 67 22900 24 45 45 40 47 50 230 7 3 25100 24 45 45 40 50 PE 240 80 27 300 24 45 45 40 47 50 9 kw ECB29 9CB 1014 2 208 68 25 00 24 44 m 40 45 45 5 lbs 50A Circuit breaker 220 76 28700 24 50 50 40 52 60 eger PAST 230 83 31400 24 50 50 40 5
3. Input kW ijBtuh 3 8 12 800 4 2 14 300 4 6 15 700 5 0 17 100 4 5 15 400 5 0 17 100 5 5 18 800 6 0 20 500 6 0 20 500 6 7 22 900 7 3 25 100 8 0 27 300 6 8 25 600 7 6 28 700 8 3 31 400 90 34 100 7 5 25 600 8 4 28 700 9 2 31 400 10 00 34 100 9 4 32 000 10 5 35 800 11 5 39 200 12 5 42 600 11 3 38 400 12 66 43 000 13 8 47 000 15 00 51 200 15 0 51 200 16 8 57 300 18 4 62 700 20 0 68 200 CBX32M 036 CBX32M 042 Blower dieu Maximum Nor Circuit Fuse Size Full Ampacity Full Ampacity Load Circuit Circuit Circuit Circuit L9 Circuit Circuit Circuit Circuit Amps 2 Amps 1 173 25 1125 2426 30 173 98 ss Bo Gets 2243 220 e 1900 cx 173 28 30 24 20 cs 30 173 28 30 24 29 30 773 30 30 24 30 1130 4175 23300 2885 85 Cats lod 5842 cake 286 ss 173 729 css 25 Oa 3942 05 3585 173 33 35 24 34 35 773 38 140 24 40 pm 173 44 vie 345 542 2240 45 oem 45 lee 173 4 45 24 45 45 173 44 45 24 45 45 173 43 1145 24 44 m 173 AG eee 500 Cats 324 7500 sese 3508 cee 173 49 50 24 50 50 173 49 50 24 50 50 173 47 180
4. 230 13 5 47000 24 48 50 40 50 50 240 150 51 200 24 48 50 40 50 50 20 kW ECB29 20CB 28K45 6 208 150 51200 24 29 21 130 430 40 30 21 430 430 19 Ibs 2 35A Circuit breaker 220 16 8 57 00 24 33 24 35 35 40 35 24 35 35 230 184 62700 24 33 24 35 35 40 35 24 35 35 240 200 68 200 24 33 24 35 35 40 35 24 35 35 25 kW ECB29 25CB 28K46 6 208 188 64 100 24 35 27 440440 40 37 27 4 40 440 19 lbs 2 45A Circuit breaker 220 210 71 700 24 41 30 45 45 40 43 30 45 45 230 230 78 00 24 41 30 45 45 40 43 30 45 45 240 250 85 00 24 41 30 45 45 40 43 30 45 45 Electric heater capacity only does not include additional blower motor heat capacity 1 3 to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 C 4 Bold text indicates that the circuit breaker on CB circuit breaker models must be replaced with size noted See Optional Circuit Breaker table for catalog numbers 5 AII 575v electric heaters are used with 460v CB30M 51 amp 65 blower coil units A 575v to 460v Step down transformer for the blower coil unit is furnished with all 575v electric heaters Blower motor is rated at 460v NOTE Circuit 1 Minimum Circuit Ampacity incl
5. LENNOX UNIT INFORMATION CBX32M L Corp 0205 L3 Service Literature Revised 01 2005 CBX32M R410A SERIES UNIT 2 are high efficiency blower coils designed for RA10A applications only Several models are available in sizes ranging from 1 1 2 through 5 tons 5 3 through 17 6 KW The CBX32M units are multi position upflow downflow or horizon tal The units come with a factory installed check and expan sion valve for cooling or heat pump applications CBX32M series units are designed to be matched with the 12 and 13 SEER air conditioner and heat pump lines While these blower coil units are designed to be primarily matched with these outdoor units they may be matched with other air condi tioners or heat pumps as noted in the rating information ECB29 electric heat in several voltages and kW sizes can be field installed in the CBX32M cabinets Information contained in this manual is intended for use by qualified HVAC service technicians only All specifications are subject to change Procedures outlined in this manual are pre sented as a recommendation only and do not supersede or re place local or state codes Table of Contents Generali 6i Rr bue stander 1 Specifications cereis e 2 Blower Data 3 PORTANT Parts Arrangement 4 Improper installation adjustment alteration service or maintenance can cause property
6. BLOWER COMPARTMENT BLOWER ACCESS PANEL HORIZONTAL DRAIN PAN COIL COIL ACCESS PANEL EXPANSION VALVE COMPLETE WITH SCREEN FIGURE 1 CBX32M CONTROL BOX SMALL ELECTRIC HEAT KNOCK OUT FOR TERMINAL 2 5 15 kW LARGE ELECTRIC HEAT STRIP TB1 KNOCK OUT FOR 20 30 kW 3 BLOWER e RELAY K3 GROUNDING LUGS TRANSFORMER T1 TERMINAL STRIP BRACKET FOR TB1 TERMINAL STRIP FIGURE 2 Page 4 I APPLICATION CBX32M blower coils are designed for R410A applica tions only All major blower coil components must be matched according to Lennox recommendations for the unit to be covered under warranty Refer to the Engineering Handbook for approved system matchups A misapplied sys tem will cause erratic operation and can result in early unit fail ure The units come with factory installed check and expansion valve for all applications The TXV valve has been installed in ternally for a cleaner installation and is accessible if required ELECTROSTATIC DISCHARGE ESD Precautions and Procedures CAUTION Electrostatic discharge can 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 unit the control
7. Page 20 COMPONENT ARRANGEMENT D ON KW AMPS COMPONENT 5 30A CIRCUIT BREAKER ELECTRIC HEAT FOR USE WITH HEI JELEMENT ELECTRIC HEAT CIRCUIT BREAKERS Pe PG ELECTRIC HEAT ONLY RELAY SEQUENCER ELECTRIC HEAT 2 SWT TCH LIMIT PRIMARY AUTO RESET LINE VOLTAGE FIELD INSTALLED TB2 TERMINAL BLOCK UNIT DENOTES OPTIONAL COMPONENTS NOTE USE COPPER CONDUCTORS ONLY cireuit ECB29 5CB UNITS EQUIPMENT A GROUND ECB29 2 5 5KW UNITS N CONNECT POWER WIRES FROM UNT LABELED LI AND L2 TO TB2 TERMINAL STRIP HEATER PLATE REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE EQUIPMENT GROUND IS LOCATED IN INDOOR UNIT LENNOX 2 inc WIRING DIAGRAM HEATING UNITS ELECTRIC ECB29 2 5 5 2 P 29 5 2 Supersedes Form New Form No ees t 532 5261 1997 Lennox Industries Inc Litho U S A C ECB29 2 5 5 5CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION 1 When there is a call for heat W1 of the thermostat ener 3 When K32 2 closes assuming N C primary S15 gizes the electric heat relay K32 with 24VAC and the secondary S20 limit switches are closed 2 When K32 1 closes the blower is energized on heat electric heat element HE1 is energized ing speed and economizer heat relay K43 is ener gized see 208 230VAC CB schematic Page 21 COMPONENT ARRANGEMENT 6 C CB OR TB ICBI HEL 2 2
8. 24 48 150 473 54 vase 0 24 55 o 60 4 173 54 60 24 55 60 173 54 60 24 55 60 173 21 31 25 045 24 22 31 25 1145 173 24 35 25 50 24 25 35 25 50 173 24 35 25 50 24 25 35 25 50 173 24 35 25 50 24 25 35 25 50 173 24 37 125 450 24 26 37 30 0150 173 28 42 30 60 24 29 42 30 60 173 28 42 30 60 24 29 42 30 60 173 28 42 30 60 24 29 42 30 60 173 44 41 1145 60 24 45 41 1445 60 173 49 46 50 60 24 50 46 50 60 173 49 46 50 60 24 50 46 50 60 173 49 46 50 60 24 50 46 50 60 CBX32M 036 CBX32M 042 32 24 32 24 32 24 33 33 33 i Electric heater capacity only does not include additional blower motor heat capacity NOTE Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps Page 8 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 C 4 Bold text indicates that the circuit breaker on CB circuit breaker models must be replaced with size noted See Optional Circuit Breaker table for catalog numbers TABLE 4 CBX32M 048 AND CBX32M 060 ELECTRIC HEAT DATA SINGLE PHASE ELECTRIC HEAT CBX32M 048 CBX32M 060
9. 5 2 21H39 5 2 21H39 5 2 Wall Hanging Bracket Kit Up Flow Only Shipping weight Ibs kg 45K30 3 1 45K30 3 1 45K30 3 1 Three Phase CBX32M 018 024 BLOWER PERFORMANCE 208 230v BLOWER DATA CBX32M 030 BLOWER PERFORMANCE 208 230 CBX32M 036 BLOWER PERFORMANCE 208 230 External Air Volume and Motor Watts at Specific Blower Taps External Air Volume and Motor Watts at Specific Blower Taps Pressure High Medium Preceure High Medium Low Wa Pa cfm Ls Watts Lis Watts x Pa Watts cfm Watts 00 0 1030 485 365 300 o 335 1045 490 315 05 10 1015 480 360 295 05 10 330 1075 505 310 10 25 1000 470 355 290 5 15 35 980 465 345 20 50 960 455 340 15 35 320 1085 510 295 25 60 935 440 335 20 50 310 1065 505 285 30 75 910 430 325 25 60 295 1030 485 270 40 100 850 400 310 280 980 460 255 50 125 780 370 295 eee a00 1390 60 150 705 330 280 70 175 615 290 265 215 615 290 190 75 185 565 265 255 185 335 155 160 NOTE All air data is measured external to unit with air filter place with bottom return air Electric heaters have no appreciable air resistance CBX32M 042 BLOWER PERFORMANCE 208 230 External Static Pressure wg Pa 00 0 05 10 10 25 15 35 20 50 25 60 130 75 40 100 50 125 60 150 170 175 175 185 Air Volume
10. Motor Watts at Specific Blower Taps High L s Watts 720 505 720 495 715 480 705 470 695 455 685 440 670 430 630 400 580 375 1100 520 345 950 450 320 870 410 305 Medium L s Watts 455 390 355 280 255 245 External Static Pressure wg 00 0 05 10 10 25 15 35 20 50 25 60 30 75 40 100 50 125 775 365 230 60 150 590 280 205 70 175 485 230 195 75 185 Air Volume and Motor Watts at Specific Blower Taps High L s Watts 860 565 845 555 825 540 805 530 785 520 760 505 735 495 675 465 610 440 535 415 455 385 415 370 1825 1790 1750 1710 1660 1610 1555 1430 1290 1135 965 875 Medium cfm 1600 1585 1565 1540 1505 1470 1425 1320 1195 1050 495 875 415 780 370 L s 755 750 740 725 710 695 675 625 565 Watts 455 455 450 440 435 425 415 390 365 335 310 295 Low L s Watts 625 370 630 370 630 370 630 365 620 360 615 355 600 350 565 330 515 310 450 285 375 260 330 250 cfm 1325 1335 1335 1330 1320 1300 1270 1195 1090 955 795 700 NOTE All air data is measured external to unit with air filter in place with bottom return air Electric heaters have no appreciable air resistance CBX32M 048 BLOWER PERFORMANCE 208 230v CBX32M 060 BLOWER PERFORMANCE 208 230 External Air Volume and Motor Watts at Specific Blower Taps External Air Volume and
11. 2 3RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT MAXIMUM OVER PROTECTION SIZE COMPONENT ARRANGEMENT K33 HE4 eo O K35 NOTE USE COPPER CONDUCTORS ONLY LINE VOLTAGE FIELD INSTALLED DENOTES OPTIONAL COMPONENTS LENNOX r ve WIRING DIAGRAM 5797 HEATING UNITS ELECTRIC ECB29 25CB 30CB 2 P Supersedes Form No New Form No Cad Litho U S A G ECB29 25CB 30CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT 1 4 When there is a call for heat W1 ofthe thermostat en ergizes the electric heat relays K32 and K34 with 24VAC When K32 1 closes the blower is energized on heat ing speed and economizer heat relay K43 is ener gized see 208 230VAC CB schematic When K32 2 closes assuming the N C primary 515 and secondary S20 limit switches are closed electric heat element HE1 is energized When K34 2 closes assuming the N C primary 515 and secondary S20 limit switches are closed electric heat element HE2 is energized SECOND STAGE HEAT remove jumper between W2 and R 5 When K34 1 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second stage heat demand energizing the electric heat relays K33 and K116 with 24VAC 6 When K33 2 and K16 1close assuming primary 515 and secondary S20 limit switches are closed electric heat
12. 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT SECOND STAGE HEAT 1 When there is a call for heat W1 of the thermostat en remove jumper between W2 and R ergizes electric heat relays K32 and K33 with 5 When K33 1 closes the unit is ready for a second stage 24VAC heat demand W2 of the thermostat sends a second 2 When K32 1 closes the blower is energized on heat stage heat demand energizing the electric heat relays ing speed and economizer heat relay K43 is ener K34 and K35 with 24 gized see 208 230VAC CB schematic 6 When K34 2 closes assuming the N C primary S15 and 3 When K32 2 closes assuming the N C primary secondary S20 limit switches are closed heating ele S15 and secondary S20 limit switches are ment HE2 is energized K34 1 closes until second stage closed electric heat element is energized heat demand is satified 4 When K33 2 closes assuming the N C primary S15 7 When K35 1 closes assuming the N C primary S15 and secondary S20 limit switches are closed electric heat element HE4 is energized and secondary S20 limit switches are closed electric heat element HE1 is energized Page 24 HE Q O BI CB2 CIHO 9 gt PS GE E KII6 K34 ON OP B CIREULT BREAKER ELECTRIC HEAT CB3 CIRCUIT BREAKER ELECTRIC HEAT HEI 2 lELEMENT ELECTRIC HEAT HE3 4 IE ELEMENT ELECTRIC HEAT HES 6 ELEMENT ELECTRIC HEAT K32 1
13. 28K40 5 208 188 64 100 24 40 31 31 1 40 445 445 40 42 31 31 1445 1445 4145 19 Ibs 3 50A Circuit breakers 220 210 71 700 24 47 35 35 50 50 50 40 48 35 35 50 50 50 230 23 0 78 300 24 47 35 35 50 50 50 4 0 48 35 35 50 50 50 240 25 0 85 300 24 47 35 35 50 50 50 4 0 48 35 35 50 50 50 30 kW ECB29 30CB 28K41 5 208 18 8 64 100 40 51 37 37 60 450 450 19 Ibs 3 60A Circuit breakers 220 21 0 71 700 40 56 42 42 60 60 60 230 23 0 78 300 Not Available 40 56 42 42 60 60 60 240 25 0 85 300 40 56 42 42 60 60 60 THREE PHASE ELECTRIC HEAT CBX32M 048 CBX32M 060 8 kW 29 8 28K42 3 208 60 20 500 24 24 25 40 25 25 5 lbs Terminal block 220 67 22900 24 27 30 40 29 30 230 7 3 25100 24 27 30 40 29 30 240 80 27 00 24 27 30 40 29 30 10 29 10 28K43 3 208 75 25 600 24 29 30 40 30 30 6 lbs Terminal Block 220 84 28700 24 33 35 40 35 35 230 92 31400 24 33 35 40 35 35 240 100 34 100 24 33 35 40 35 35 15 kW 29 15 28K44 3 208 113 38400 24 42 445 40 43 45 12 lbs 50A Circuit breaker 220 126 43 000 24 48 50 40 50 50
14. Application NOTE CBX32M 018 024 units do not require downflow drip sheilds The following tables outline the sizes of the various drip shields TABLE 6 Downflow Drip Shields LB 88658 15 75 2 9187 036 042 LB 88663 17 75 3 9187 048 060 LB 88664 19 75 3 9187 1 Remove the access panels If necessary remove the corrugated padding between the blower and coil as sembly before operating the unit Remove the drip shields from the foam pads on the top of the unit 2 Remove the coil assembly from the unit 3 For best efficiency and air flow remove the horizontal drain pan from the units in downflow positions See fig ure 11 4 Rotate cabinet 180 from the upright position See fig ure 11 You may need to first remove the blower assem bly to lighten the cabinet for lifting DOWNFLOW DISCHARGE POSITION Remove the horizontal Upflow Downflow drain pan Drain Pan FIGURE 11 DOWNFLOW DRIP SHIELDS Drip Shield FIGURE 12 5 From the underside of the coil install the downflow drip shield firmly in place See figure 12 6 Replace the coil assembly and blower if you have re moved it Replace the coil access panel See figure 11 7 Setthe unit so that it is level Connect the return and sup ply air plenums as required using sheet metal screws NOTE For downflow application you must use metal or class supply and return air plenums NOTE For downflo
15. Motor Watts at Specific Blower Taps Preceucs High Medium Pressure High Medium Low Pa cfm Ls Watts cfm Ls Watts die Pa cfm Ls Watts cfm Ls Watts cfm 1 6 Watts 00 0 11910 900 590 00 0 2115 995 780 2025 955 670 1775 835 585 05 10 1895 895 585 05 10 2100 990 770 2010 950 665 1775 835 590 10 25 1870 880 580 10 25 2085 985 765 1995 940 655 1770 835 580 15 35 1840 865 570 15 35 2060 970 750 1975 930 645 1760 830 570 20 50 1800 850 565 20 50 2030 960 740 1950 920 635 1745 825 560 25 60 1755 830 550 25 60 2000 945 730 1915 905 625 1725 815 550 130 75 11700 805 540 1600 755 465 1380 650 395 130 75 1960 925 715 1880 885 610 1695 800 535 40 100 1580 745 515 1485 700 440 1290 610 370 40 100 1870 880 685 1795 845 580 1630 770 505 150 125 1425 675 485 1350 635 410 1170 550 345 50 125 1755 830 655 1690 795 545 1540 725 475 60 150 1250 590 450 1190 560 380 1020 480 320 60 150 1620 765 625 1560 735 515 1425 675 440 170 175 1045 495 415 1000 470 350 840 395 295 E 175 1465 690 590 1415 670 480 1295 610 410 75 185 930 440 400 900 425 335 740 350 280 80 200 1290 610 560 1250 590 445 1140 535 375 85 210 1195 565 545 1160 550 425 1050 495 360 NOTE air data is measured external to unit with air filter in place with bottom return air Electric heaters have no appreciable air resistance Page 3 CBX32M PARTS ARRANGEMENT ELECTRIC HEAT SECTION CONTROL BOX
16. ONY LENNOX aries WIRING DIAGRAM 5 7 TB2 USED ON HEATING UNITS ELECTRIC 5 8 amp IOKW HEATERS ONLY CBI USED ON ECB29 8 10 2 Y ISKW HEATER ONLY 29 5 2 EQUIPMENT GROUND LOCATED IN INDOOR Supersedes Form No New Form No EE 1997 Lennox Industries Inc Litho U S A CIRCUIT H ECB29 5 8 10 15CB 208 230V THREE PHASE SEQUENCE OF OPERATION 1 When there is a call for heat W1 ofthe thermostat en gized see 208 230VAC CB schematic C electric heat relays K32 and K34 4 when K32 2 K33 2 and K34 1 closes assuming the m primary 515 and secondary S20 limit switches 2 When K32 1 and or K33 1 closes the blower is energized are closed electric heat elements HE1 HE2 and HE3 on heating speed and economizer heat relay K43 is ener are energized Page 26 COMPONENT ARRANGEMENT COMPONENT IRCUIT BREAKER ELECTRIC HEAT CB2 CIRCUIT BREAKER ELECTRIC HEAT n MEN HES 6 ELEMENT ELECTRIC HEAT IK34 1 2 RELAY SEQUENCER ELECTRIC HEAT 35 l 2 RELAY SEQUENCER ELECTRIC HEAT ISIS SWITCH LIMIT PRIMARY AUTO RESET SWITCH LIMIT SECONDARY CIRCUIT 2 E RN EQUIPMENT GROUND i LENNOX ees inc NOTE USE COPPER CONDUCTORS ONLY LINE VOLTAGE FIELD INSTALLED DENOTES OPTIONAL COMPONENTS CIRCUIT WIRING DIAGRAM 11 95 HEATING UNITS ELECTRIC PROTECTION SIZE Supersedes Form No 1995 Lennox Industries Inc 29 20
17. SWITCH LIMIT SECONDARY LINE VOLTAGE FIELD INSTALLED TERMINAL BLOCK UNIT DENOTES OPTIONAL COMPONENTS NOTE USE COPPER CONDUCTORS ONLY L A A O 5 CIRCUIT L2 4 12 L2 12 2 29 5 8 ECB29 2 5 5 8KW UNITS UNITS N EQUIPMENT A GROUND CONNECT POWER WIRES FROM UNT LABELED LI AND 12 70 2 TERMINAL STRIP ON HEATER PLATE REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE EQUIPMENT GROUND 15 LOCATED IN INDOOR UNIT 5KW ONE ELEMENT LENNOX B 5iries me WIRING DIAGRAM HEATING UNITS ELECTRIC ECB29 2 5 5 8 1 P ECB29 5CB 8CB P Supersedes Form No New Form No 531 616W 1995 Lennox Industries Inc Litho U S A B ECB29 2 5 5 5CB 8 8 208 230V SINGLE PHASE SEQUENCE OF OPERATION 1 When there is a call for heat W1 of the thermostat ener 3 Assuming the N C primary 815 and secondary S20 gizes the electric heat relay K32 with 24VAC limit switches are closed electric heat element HE1 is en ergized 2 When K32 1 closes the bloweris energized on heat 4 When K32 2 closes assuming the N C primary 515 ing speed and economizer heat relay K43 is ener and secondary S20 limit switches are closed electric gized see 208 230VAC CB schematic heat element HE2 is energized
18. and the technician at the same electrostatic potential Neutralize electro static charge by touching hand and all tools on an unpainted unit surface before performing any service procedure II UNIT COMPONENTS A Control Box The CBX32M control box is shown in figure 2 Line voltage and electric heat connections are made in the control box Optional electric heat fits through an opening located in the center of the control box When electric heat is not used knock out plates cover the opening The electric heat control arrangement is detailed in the electric heat section of this manual B Terminal Strip TB1 CBX32M units are equipped with a low voltage terminal strip TB1 located in the control box See figure 2 The strip is used for making up all indoor thermostat wires The out door unit low voltage wiring connections may be spliced with wire nuts inside the CB units Page 5 C Transformer T1 CBX32M series units use a single line voltage to 24VAC transformer mounted in the control box The transformer supplies power to the control circuits in the indoor and outdoor unit Transformers on all CBX32M 1 units are rated at 70VA Transfomers on CBX32M 018 through 042 2 units are rated at 7 and CBX32M 048 060 2 units are rated at 40VA 208 240VAC single phase transformers use two primary voltage taps as shown in figure 3 208 240 VOLT TRANSFORMER PRIMARY SECONDARY ORANGE 240 VOLTS RED 208 VOLTS F
19. damage person Application ske sd 5 al injury or loss of life Installation and service must 1 be performed by a qualified installer or service II Unit Components 5 agency Electric Heat Data 7 Electric Heat Components 12 A WARN N G IV Configuration Modifications 15 4 Electric shock hazard Can cause injury V Start Up Operation 18 or death Before attempting to perform VI Typical Operating Characteristics 19 any service or maintenance turn the electrical power unit OFF at VII Maintenance dA RR od EI CR Ate oh Dac part 19 nect switch es Unit may have multiple VIII Wiring Diagrams and Operating Sequence 20 power supplies Techni cal Page 1 2002 Lennox Industries Inc Publications Litho U S A SPECIFICATIONS mm 1 381 x 508 x 25 1 508 x 508 x 25 General Data Model Number CBX32M 018 024 CBX32M 030 CBX32M 036 Nominal Tonnage kW 1 5 2 5 3 7 2 5 8 8 3 10 6 Refrigerant R 410A R 410A R 410A Connections Suction vapor line in mm sweat 5 8 16 3 4 19 3 4 19 Liquid line in mm sweat 3 8 9 5 3 8 9 5 3 8 9 5 Condensate drain fpt in mm 2 3 4 19 2 3 4 19 2 3 4 19 Evaporator Net face area ft 2 m 3 56 0 33 4 44 0 41 5 0 0 46 oa Tube outside diameter in
20. elements and HE6 are energized 7 K33 1 closes and remains closed until second stage heat demand is satisfied THIRD STAGE HEAT remove jumper between W3 and R if using third stage 8 When K32 3 closes the unit is ready for a third stage heat demand W3 if available of the thermostat sends a third stage heat demand energizing the electric heat relays K35 and K117 with 24VAC 9 When K35 2 and K117 1 close assuming the N C primary 815 and secondary S20 limit switches are closed electric heat elements HE4 and HE5 are energized K35 1 closes until third stage heat de mand is satisfied Page 25 COMPONENT ARRANGEMENT K33 D l CIRCUIT BREAKER TRIC HEAT HE 2 3 JELEMENT ELECTRIC HEAT P2 PLUG ELECTRIC HEAT RELAY SEQUENCER ELECTRIC HEAT IK33 1 2 RELAY SEQUENCER ELECTRIC HEAT CONNECT POWER WIRES FROM RELAT SEQUENCER ELECTRIC HEAT HEATER LABLED 11 12 13 TO TB2 TERMINAL STRIP S20 ISWITCH L IMIT ECONDARY INSIDE INDOOR UNIT 1B2 Ss TERMINAL BLOCK ELECTRIC HEAT LINE VOLTAGE FIELD INSTALLED CIRCUIT DENOTES OPTIONAL COMPONENTS _ REVA 29 5 1 CBI LI a gt L2 a T REFER TO UNIT EN L2 t cus NAMEPLATE FOR EQUIPMENT N MINIMUM CIRCUIT GROUND AND MAXIMUM OVER gt PROTECTION SIZE NOTE USE 60 BREAKER ON ECB29 15CB UNITS FOR COMPLETE CIRCUIT USE DIAGRAM FOR THE 508
21. energized on heat primary S15 and secondary S20 limit switches ing speed and economizer heat relay K43 is ener are closed electric heat element HE1 is energized See 208 SOV Bee mene 5 W2 ofthe thermostat sends a second stage heat de 3 When K32 2 closes assuming the N C primary 515 mand energizing electric heat realy K34 with and secondary S20 limit switches are closed electric 24VAC heat element HE2 is energized 6 When K34 1 closes assuming the N C primary 515 and secondary 520 limit switches are closed heating element HE3 is energized K34 1 closes until second stage demand is satisfied Page 23 DESCRIPTION KEY Tee COMPONENT A E CIRCUIT BREAKER ELECTRIC HEAT 87 CIRCUIT BREAKER ELECTAIC HEAT RETER TO UNII HEI 2 ELEMENT ELECTRIC HEAT I NAME TE FOR 4 ELEMENT ELECTRIC HEAT ANPACLTY AND pp PLUG ELECTRIC HEAT I MAXIMUM OVER _ NOTE USE COPPER K35 2 RELAY SEQUENCER ELECTRIC HEAT PROTECTION SIZE CONDUCTORS ONLY 2 RELAY SEQUENCER ELECTRIC HEAT IK35 1 N LINE VOLTAGE FIELD INSTALLED lt DENOTES OPTIONAL COMPONENTS Isis JSWITCH LIMIT PRIMARY AUTO RESE 520 SWITCH LIMIT SECONDARY m 25 CB2 EQUIPMENT GROUND CIRCUIT 2 CIRCUIT lt LENNOX Suus ne WIRING DIAGRAM HEATING UNITS ELECTRIC ECB29 20CB 2 P Supersedes Form No New Form No wem ret 532 5254 1997 Lennox Industries Inc Litho U S A F ECB29 20CB
22. mm 3 8 9 5 3 8 9 5 3 8 9 5 Number of rows 3 3 3 Fins per inch fins per m 12 472 12 472 12 472 Blower Data Wheel nominal diameter x width in 10x7 10x8 11x8 mm 254 x 178 254 x 203 279 x 203 Blower motor output hp W 1 5 149 1 3 249 1 3 249 Filters tNumber and size in 1 15 x 20 x 1 1 20 x 20 x 1 1 20 x 20x 1 1 508 x 508 x 25 Electrical characteristics 60hz Shipping Data 1 Package Optional Accessories Must Be Ordered Extra CCB1 EfficiencyPlus Humidity Control Down Flow Combustible Base EBR1 Blower Relay Kit for CCB1 Electric Heat Shipping weight Ibs kg 208 230v 1ph 136 lbs 62 kg 208 230v 1ph 157 lbs 71 kg 208 230v 1ph 177 Ibs 80 kg Side Return Unit Stand Up Flow Only Single Point Power Source Control Box Wall Hanging Bracket Kit Up Flow Only Disposable frame type filter Shipping weight Ibs kg Shipping weight Ibs kg Shipping weight Ibs kg Model Number Nominal Tonnage kW Refrigerant Suction vapor line in mm sweat Liquid line in mm sweat Condensate drain fpt in mm General Data Connections Evaporator Net face area ft 2 m2 coil Tube outside diameter in mm Number of rows Fins per inch fins per m Blower Data Wheel nominal diameter x width in mm Blower motor output hp W Filters fNumber and size in mm 35H00 35H00 35H00 34J72 8 4 34J73 8 4 34J73 8 4 75H9
23. 0 75H90 75H90 2 5 to 20 kW See Electric Heat Data tables 45K31 5 2 45K32 6 3 45K32 6 3 21H39 5 2 21H39 5 2 21H39 5 2 45K30 3 1 45K30 3 1 45K30 3 1 CBX32M 042 CBX32M 048 CBX32M 060 3 5 12 3 4 14 1 5 17 6 R 410A R 410A R 410A 7 8 22 2 7 8 22 2 1 1 8 28 3 8 9 5 3 8 9 5 3 8 9 5 2 3 4 19 2 3 4 19 2 3 4 19 5 0 0 46 7 22 0 67 7 22 0 67 3 8 9 5 3 8 9 5 3 8 9 5 3 3 3 12 472 12 472 12 472 11x8 11 1 2x 9 12x9 279 x 203 292 x 229 305 x 229 1 3 249 1 3 249 1 2 373 1 20x 20 x 1 1 508 x 508 x 25 1 20x24 x 1 1 508 x 610 x 25 1 20x24 x 1 1 508 x 610 x 25 Electrical characteristics 60hz Shipping Data 1 Package 208 230v 1ph 181 lbs 82 kg 208 230v 1 ph 206 lbs 93 kg 208 230v 1 ph 206 lbs 93 kg Optional Accessories Must Be Ordered Extra Disposable frame type filter Optional CIRCUIT BREAKER KITS Must Be Ordered Extra C Amperage 25 Single Phase CCB1 EfficiencyPlus Humidity Control 35H00 35H00 35H00 Down Flow Combustible Base Shipping weight Ibs kg 34J73 8 4 34J73 8 4 34J73 8 4 EBR1 Blower Relay Kit for CCB1 75H90 75H90 75H90 Electric Heat 5 to 30 kW See Electric Heat Data tables Side Return Unit Stand Up Flow Only Shipping weight Ibs kg 45K32 6 3 45K32 6 3 45K32 6 3 Single Point Power Source Control Box Shipping weight Ibs kg 21H39
24. 2 60 TEUR DISSERO 240 90 34 100 24 50 50 40 52 60 10 kW ECB29 10 28K35 2 208 75 25600 24 48 HB 40 51 5 555 60 coc con 6 Ibs Terminal Block 220 84 28700 24 55 60 40 57 60 FET C 230 92 31400 24 55 60 40 57 60 240 10 0 34 100 24 55 60 40 57 60 12 5 kW ECB29 12 5CB 28K37 3 208 94 32000 24 22 31 25 445 40 23 31 25 4145 10 lbs 1 25 amp 1 50A Circuit breaker 220 10 5 35 800 24 25 35 25 50 40 27 35 30 50 AN GEA 230 115 39200 24 25 35 25 50 40 27 35 30 50 240 125 42600 24 25 35 25 50 40 27 35 30 50 15 kW 29 15 28K38 3 208 113 38 400 24 26 37 30 450 40 27 37 30 4150 12 lbs 1 amp 1 6 Circuit breaker 220 126 43000 24 29 42 30 60 40 31 42 35 60 80A HE rer 230 135 47000 24 29 42 30 60 40 31 42 35 60 240 150 5120 24 29 42 30 60 40 31 42 35 60 20 kW ECB29 20CB 11134 4 208 150 51200 24 45 41 45 60 40 46 41 50 60 19 lbs 1 50A amp 1 60A Circuit breaker 220 16 8 57 300 24 50 46 50 60 40 52 46 60 60 me 230 18 4 62700 24 50 46 50 60 40 52 46 60 60 240 200 68200 24 50 46 50 60 40 52 46 60 60 25 kW ECB29 25CB
25. 25CB 208 230V THREE PHASE FIRST STAGE HEAT 1 When there is a call for heat W1 ofthe thermostat en ergizes the electric heat relays K32 and K34 with 24VAC When K32 1 closes the blower is energized on heat ing speed and economizer heat relay K43 is ener gized see 208 230VAC CB schematic When K32 1 and K32 2 closes assuming the N C primary 515 and secondary S20 limit switches are closed electric heat elements HE1 and HE2 are energized When K34 1 closes assuming the N C primary 515 and secondary S20 limit switches are closed electric heat element is energized Page 27 ECB29 20CB 25CB I Y New Form No 531 707W Litho U S A SEQUENCE OF OPERATION SECOND STAGE HEAT remove jumper between W2 and R 5 When K34 2 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second stage heat demand energizing the electric heat relays K33 and K35 with 24VAC 6 When K33 1 closes the blower if not energized is energized on heating speed and economizer heat relay K43 is energized see 208 230VAC CB sche matic 7 When K33 1 K35 1 and K35 2 contacts close assum ing the N C primary 815 and secondary S20 limit switches are closed electric heat elements 4 HE5 and HE6 are energized
26. 8 9 From the upflow position replace coil assembly Then flip cabinet 90 to the left and set into place Re place coil assembly Secure coil in place by bending down tab on cabinet support rail See figures 17 and 19 LEFT HAND DISCHARGE CONFIGURATION HORIZONTAL DRIP SHIELD SECURING TAB ON CABINET SUPPORT RAIL S EE DOWNFLOW RAIL FIGURE 19 HORIZONTAL DRAIN PAN NOTE For horizontal applications in high humidity areas remove the downflow rail closest to the drain pan To re move rail remove screw from rail at back of unit and at cab inet support rail Remove downflow rail then replace screws Also seal around the exiting drain pipe liquid and suction lines to prevent infiltration of humid air 11 Flip access door Knock out the portion of door for the drain pipes and attach to the cabinet with screw pro vided Replace access door on the unit 12 Set unit so it is sloped towards the drain pan 1 4 6mm Connect return and supply air plenums as re quired using sheet metal screws 13 If hanging the unit it must be supported along the entire length of the cabinet If using chain or strap use a piece of angle iron or sheet metal attached to the unit either above or below so that the full length of the cabinet is sup ported Use securing screws no longer than 1 2 13mm to avoid damage to coil or filter See figure 16 Connect return and supply air plenums as required using sheet
27. 9EH 9CB 91K68 220 7 6 25 800 1 5 49 50 1 73 49 50 230 83 28200 1 5 49 50 173 49 MG 7222 240 90 30 700 1 5 49 50 1 73 49 50 10 kW 29 10 28 35 2 208 7 5 25 600 1 5 47 4150 1 73 47 4150 6 Ibs Terminal Block ECB29 10CB 28K36 220 84 28 700 1 5 54 60 1 73 54 60 60A Circuit breaker 230 92 31400 1 5 54 60 1 73 54 IA 60 232 240 10 0 34 100 1 5 54 60 1 73 54 60 12 5 kW ECB29 12 5CB 28K37 3 208 7 5 25 600 1 73 21 31 25 4145 10 lbs 1 25 amp 1 50A Circuit breaker ECB29EH 12 5CB 91K68 220 84 28 700 1 73 24 35 25 50 ircui Not Available 1 25A amp 1 50A Circuit breaker 230 92 31 400 1 73 24 35 25 50 240 10 0 34 100 1 73 24 35 25 50 15 kW ECB29 15CB 28K38 3 208 11 3 38 400 1 73 24 37 4125 4150 12 lbs 1 30A amp 1 60A Circuit breaker ECB29EH 15CB 91K69 220 12 6 43 000 1 73 28 42 30 60 ircui Not Available 1 30A amp 1 60A Circuit breaker 230 13 8 47 000 1 73 28 42 30 60 240 15 0 51 200 1 73 28 42 30 60 i Electric heater capacity only does not include additional blower motor heat capacity 3 Refer to National or Canadian Electrical Code manual to determine wire fuse and disconnect size requirements Use wires suitable for at least 167 F 75 C 4 Bold text indicates that the circuit breaker on CB circuit breaker models must be replaced with size noted See Optional Circuit Breaker table for catalog numbers NOTE Circuit 1 Minimum Circuit A
28. IGURE 3 YELLOW D Circuit Breaker CB8 1 units All transformers used in the CBX32M 1 series units are equipped with internal secondary voltage overcurrent protection Each transformer uses a circuit breaker 8 located on the transformer The circuit breaker is connected in series with the blue secondary voltage wire and is rated 3 5 Amps E Transformer Fuse F1 2 units The transfomer in all CBX32M 2 units is protected by an in line fuse F1 The fuse is rated at 32 volts and 3 amps F Blower Relay K3 CBX32M units use a DPDT relay to energize the blower motor The relay coil is energized by blower demand from indoor thermostat When the coil is energized a set of N O contacts closes to energize the blower motor on cooling speed When de energized a set of N C contacts allows the optional electric heat relay to energize the blower on heating speed refer to unit wiring diagram BLOWER ASSEMBLY BLOWER HOUSING BLOWER MOTOR CAPACITOR C4 BLOWER BLOWER MOTOR WHEEL B3 FIGURE 4 G Blower Motor B3 CBX32M units use single phase direct drive blower motors with a run capacitor Figure 4 shows the parts arrangement All motors use multiple speed taps Typically the high speed tap is energized during normal operation The horse power for each blower motor is listed in table 1 All units are factory wired for the minimum blower speed for heat pump and cooling applications with or without electric hea
29. IPLUG ELECTRIC H RIPTION ae COMPONENT PLUG ELECTR C HEAT RELAY SEQUENCER ELECTRIC HEAT 33 1 2 is MGE LIMIT PR AUTO RESE 20 SECONDAR TERMINAL BLOCK UNIT ECB29 OCB UNITS EQUIPMENT GROUND A A CONNECT POWER WIRES STRIP ON HEATER PLATE REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE EQUIPMENT GROUND IS LOCATED IN INDOOR UNIT LENNOX D siria Inc FOR USE WITH OU eer BREAKERS NOTE USE COPPER CONDUCTORS ONLY LINE VOLTAGE FIELD INSTALLED DENOTES OPTIONAL COMPONENTS A CIRCUIT WIRING DIAGRAM 5 97 HEATING UNITS ELECTRIC 29 10 2 29 0 2 Supersedes Form New Form No pei t 532 627V 01997 Lennox Industries Inc Litho U S A D ECB29 10 10CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT 1 When there is a call for heat W1 of the thermostat ener gizes the electric heat relay K32 with 24VAC 2 When K32 1 closes the bloweris energized on heat ing speed and economizer heat relay K43 is ener gized see 208 230VAC CB schematic 3 K32 3 closes and assuming the N C primary S15 and secondary S20 limit switches are closed electric heat element HE1 is energized SECOND STAGE HEAT remove jumper between W2 and R 4 When K32 2 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a se
30. NECTION USED ON Y MEDIUM 5 T MEDIUM LOV L 6 iW J LENNOXe coi s eLowER COIL UNITS CBX32M 018 024 030 036 042 048 060 230 2 THIS WIRE ON T VOLTAGE UNITS ONLY LINE VOLTAGE FIELD WIRING CLASS II VOLTAGE FIELD WIRING 82002 Lennox Induetries Ine COIL SECTION New Form No 534 300W Lithe U S A A CBX32M 208 230V SINGLE PHASE SEQUENCE OF OPERATION 1 Line voltage is routed to transformer T1 and blower motor B3 2 T1 supplies 24VAC to terminal strip TB1 which sup plies 24VAC to the indoor thermostat and electric heat if used HEATING 3 When there is a call for heat W1 of the thermostat ener gizes the electric heat relay K32 covered in the electric heat section Page 19 4 Blower motor B3 is energized on heating speed after K32 1 closes see electric heat Economizer relay K43 if used is energized after K32 1 closes see electric heat section 5 6 K43 1 closes energizing the economizer with 24VAC COOLING 7 When there is a call for cooling G of the thermostat ener gizes blower relay K3 and the economizer if used 8 K3 2 closes energizing blower motor on cooling speed COMPONENT ARRANGEMENT CB OR TB OO DESCRIPTION KW COMPONENT 5 CIRCUIT BREAKER ELECTRIC HEAT 8 ELEMENT ELECTRIC HEAT FOR USE WITH 3 PLUG ELECTRIC HEAT CIRCUIT BREAKERS L RELAY SEQUENCER ELECTRIC HEAT ONLY SWITCH LIMIT PRIMARY AUTO RESET
31. RIC HEAT ELECTRIC HEAT lt ELEMENT VESTIBULE PANEL SEQUENCER RELAY 33 lt PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 ELECTRIC HEAT ELEMENT HE1 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 CIRCUIT BREAKE 1 ELECTRIC HEAT SEQUENCER RELAY K32 ELECTRIC HEAT SEQUENCER RELAY K34 FIGURE 8 Page 12 ECB29 20CB 25CB 208 230 THREE PHASE ECB29 25CB 30CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT 2 ELECTRIC HEAT ELECTRIC HEAT ELEMENT HE6 SEQUENCER RELAY K33 ELECTRIC HEAT VESTIBULE PANEL IK Be PRIMARY LIMIT S15 f ey amp SECONDARY LIMIT 520 SS CIRCUIT BREAKER CIRCUIT BREAKER ELECTRIC HEAT CIRCUIT BREAKER CB3 SEQUENCER RELAY K116 ELECTRIC HEAT ELEMENT HE1 amp HE2 not shown ELECTRIC HEAT ELEMENT HE4 ELECTRIC HEAT ELEMENT HE3 ELECTRIC HEAT ELEMENT 5 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 ELECTRIC HEAT SEQUENCER RELAY K32 ELECTRIC HEAT SEQUENCER RELAY K35 ELECTRIC HEAT SEQUENCER RELAY K34 FIGURE 9 IV CONFIGURATION MODIFICATIONS CBX32M units may be installed in the upflow downflow hori zontal right hand discharge or horizontal left hand discharge orientation The units come from the factory ready for upflow or horizon tal right hand discharge installation If the unit needs to be modified from its original configuration use the follo
32. ST PPLY UNIT SHOWN IN UPFLOW POSITION MANOMETER RETURN FIGURE 22 2 Punch a 1 4 6mm diameter hole in supply and return air plenums Insert manometer hose flush with inside edge of hole or insulation Seal around the hose with per magum Connect the zero end of the manometer to the discharge supply side of the system On ducted sys tems connect the other end of manometer to the return duct as above For systems with non ducted returns leave the other end of the manometer open to the atmo sphere 3 With only the blower motor running and the evapora tor coil dry observe the manometer reading Adjust blower motor speed to deliver the air desired accord ing to the job requirements 4 External static pressure drop must not exceed 0 5 W C 1 2 kPa 5 Seal around the hole when the check is complete C Blower Speed Taps Blower speed tap selection is accomplished by changing the taps at the blower motor harness connector Discon nect harness connector from motor to expose speed se lectors Blower speed selections are listed on the wiring diagrams Refer to the ECB29 installation instructions for minimum allowable blower speed when using elec tric heat To Change Blower Speed 1 Turn off electric power to furnace 2 Remove blower access door 3 Disconnect blower motor harness from motor 4 Select desired speeds for heating and cooling Black cooling high speed Oran
33. able 5 shows the amp rating for each circuit breaker used Single phase electric heat uses two pole circuit breakers while three phase electric heat uses three pole circuit breakers TABLE 5 ECB29 CIRCUIT BREAKERS ms Jone esci e gt eso gt E AMP 50 AMP EN mee 30 Ave eae T somme AMP ss so Av sur some 00 Av 60 AMP 60 AMP sene ae gt sene somme wr so ame wmm Note Do not remove patch plate or insulation on units without circuit breakers 4 Terminal Strip TB2 208 230 volt only For the electric heat sections without circuit breakers or fuses line voltage connections are made to terminal strip TB2 The terminal strip is located in the lower left corner of the electric heat vestibule panel Single phase electric heat uses two pole terminal strips while three phase electric heat uses three pole terminal strips 5 Heating Elements HE1 through HE6 Heating elements are composed of helix wound bare nichrome wire exposed directly to the airstream The ele ments are supported by insulators mounted to the wire frame For single phase applications one element is used per stage Each stage is energized indepen dently by the corresponding relay located on the electric heat vestibule panel All three phase heating elements are arranged in a three phase delta Once energized h
34. al codes NOTE For horizontal applications in high humidity areas remove the downflow rail closest to the drain pan To re move rail remove screw from rail at back of unit and at cab inet support rail Remove downflow rail then replace screws Also seal around the exiting drain pipe liquid and suction lines to prevent infiltration of humid air RIGHT HAND DISCHARGE CONFIGURATION UPFLOW DOWNFLOW HORIZONTAL DRAIN PAN DRIP SHIELD HORIZONTA DRAIN PAN FIGURE 15 3 If hanging the unit it must be supported along the entire length of the cabinet If using chain or strap use a piece of angle iron or sheet metal attached to the unit either above or below so that the full length of the cabinet is supported Use securing screws no longer than 1 2 13mm to avoid damage to coil or filter See figure 16 Connect return and supply air plenums as re quired using sheet metal screws HANGING HORIZONTAL UNIT Electrical Inlet Clearance 4 in 102 mm 1 2 13mm Screws max ANGLE IRON OR SHEET METAL END VIEW FRONT VIEW FIGURE 16 A CAUTION Danger of equipment damage and personal injury Take care when removing coil assembly from unit installed in right or left hand applications Coil may tip into drain pan once clear of cabinet Sup port coil when removing E Horizontal Left Hand Discharge Application NOTE For horizontal applications a secondary drain pan is recommend
35. cond stage heat demand energizing the electric heat relay K33 with 24VAC 5 When K33 2 closes assuming the N C primary 515 and secondary S20 limit switches are closed electric heat element HE2 is energized K33 1 closes until sec ond sage heat demand is satisfied Page 22 ON COMPONENT CIRCUIT BREAKER ELECTRIC HEAT IRCUIT BREAKER ELECTRIC HEAT 2 ELEMENT ELECTRIC HEAT 5 4 ELEMENT ELECTRIC HEAT IP2 PLUG ELECTRIC HEAT ELAY SEQUENCER ELECTRIC HEAT IK35 1 a 54 1 2 515 ISWITCH LIMIT PRIMARY AUTO RESET SWITCH LIMIT SECONDARY W LINE VOLTAGE FIELD INSTALLED lt DENOTES OPTIONAL COMPONENTS A CIRCUIT 2 CIRCUIT LI a gt A L2 CB2 EQUIPMENT GROUND i REFER TO UNIT NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER PROTECTION SIZE NOTE USE COPPER CONDUCTORS ONLY LENNOX 2 vc WIRING DIAGRAM HEATING UNITS ELECTRIC ECB29 12 5CB I5CB 2 P Supersedes Form No New Form No Pee in t 552 520 1997 Lennox Industries Inc Litho U S A E ECB29 12 5CB 15CB 208 230V SINGLE PHASE SEQUENCE OF OPERATION FIRST STAGE HEAT SECOND STAGE HEAT 1 When there is a call for heat W1 of the thermostat ener remove Jumper between we and R gizes electric heat relays K32 and K33 with 24VAC 4 When K33 1 closes the unit is ready for a second stage heat demand When K33 2 closes assuming the N C 2 When K32 1 closes the blower is
36. eat transfer is instantaneous High tem perature protection is provided by primary and sec ondary high temperature limits Page 10 ECB29 2 5 5 5CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT VESTIBULE PANEL PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 TERMINAL BLOCK TB2 ELECTRIC HEAT CIRCUIT BREAK SEQUENCER RELAY K32 ER CB1 FIGURE 5 ECB29 8 8CB 10 10CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT VESTIBULE PANEL ELECTRIC HEAT ELEMENT HE2 ELECTRIC HEAT ELEMENT HE1 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 TERMINAL BLOCK TB2 ELECTRIC HEAT ELECTRIC HEAT SEQUENCER RELAY K33 SEQUENCER RELAY K32 FIGURE 6 Page 11 ECB29 8 10 208 230 THREE PHASE ECB29 12 5CB 15CB 208 230 SINGLE amp THREE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT ELEMENT ELECTRIC HEAT 2 ELECTRIC HEAT lt lt ELECTRIC HEAT ELEMENT HE2 VESTIBULE PANEL SEQUENCER RELAY K33 CIRCUIT BREAKER ELECTRIC HEAT ELEMENT HE1 PRIMARY LIMIT S15 amp SECONDARY LIMIT S20 TERMINAL BLOCK TB2 PRIMARY LIMIT S15 ELECTRIC HEAT amp SECONDARY LIMIT 520 SEQUENCER RELAY K32 CIRCUIT BREAKER CB2 FIGURE 7 ECB29 20CB 208 230 SINGLE PHASE ELEMENT de ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT ELECTRIC HEAT ELECT
37. ed Refer to local codes 1 Discard drip shields if applicable The shields are used for downflow applications only 2 Pull coil assembly from unit Pull off the horizontal drain pan 3 Remove drain plugs from back drain holes on horizon tal drain pan and re install them on front holes 4 Rotate drain pan 180 front to back and install it on the opposite side of coil 5 Remove screws from top cap Remove horizontal drip shield screw located in the center of the back coil end seal See figure 17 6 Rotate horizontal drip shield 180 front to back 7 Remove plastic plug from left hole on coil front end seal and re install plug in back hole Re install horizon tal drip shield screw in front coil end seal Drip shield should drain downward into horizontal drain pan inside coil 8 Rotate top cap 180 front to back and align with un used screw holes Holes must align with front and back coil end plates Note that top cap has a 45 bend on side and 90 bend on the other The 90 bend must be on the same side as the horizontal drain pan See figures 17 and 18 NOTE Use extreme care when re installing screws into coil end plate engaging holes Coil damage could result by mis alignment FIELD MODIFICATION FOR LEFT HAND DISCHARGE ir CABINET SUPPORT COIL SHOWN IN UP FLOW POSITION FOR EASY CONVERSION FIGURE 17 Page 15 BACK COIL END SEAL FIGURE 1
38. ge common Yellow electric heat only 5 Depress harness connector tab to release wire ter minal Select connector location for new speed re fer to unit wiring diagram Insert wire terminal until it is securely in place See figure 23 6 Replace harness connector to motor BLOWER SPEED TAP SELECTION HARNESS CONNE TOR DEPRESS TAB RELEASE WIRE TERMINAL SELECT CONNECTOR LOCATION A FOR NEW SPEED REFER TO UNIT WIRING DIAGRAM INSERT WIRE UNTIL IT IS SECURELY IN PLACE FIGURE 23 VII MAINTENANCE At the beginning of each heating cooling season the sys tem should be checked as follows A Filters Filter access panel must be in place during unit operation Excessive warm air entering the unit may re sult in water blow off problems TABLE 7 CBX32M FILTER SIZES Fes 15 X 20 stem x 08mm CBX32M 030 036 042 sosmmxs08mm 508mm X 610 To remove filter loosen the thumbscrews holding the fil ter panel in place Slide filter out of the guides on either side of cabinet insert new filter and replace panel Some models come with a spacer so standard size filters can be used Filters should be inspected monthly and must be replaced when dirty to ensure proper blower coil op eration See table 7 for replacement filter sizes or see the sticker located on the filter access door specifying the size of the standard throw away fi
39. lter which is used with the unit B Supply Air Blower 1 Check and clean blower wheel 2 Motors are prelubricated for extended life no further lu brication is required C Electrical 1 Check all wiring for loose connections 2 Check circuit breaker located in unit control box 3 Check for correct voltage at unit unit operating 4 Check amp draw on blower motor 5 Check to see that heat if applicable is operating CBX32M 048 060 Page 18 VIII WIRING DIAGRAMS AND SEQUENCE OF OPERATIONS FIELD WIRING FOR ECB SERIES UNITS WITHOUT CIRCUIT BREAKERS CIRCUIT 3 CB5 L2 fn tl A EQUIPMENT GROUND LOCATED INDOOR UNIT ONNECT POWER WIRES FROM HEATER LABELED L L2 0N P VOLTAGE UNITS AND 11 12 13 ON Y VOLTAGE UNITS TO TB2 TERMINAL STRIP IN INDOOR UNIT T EQUIPMENT is EQUIPMENT FIELD WIRING FOR ECB SERIES UNITS WITH CIRCUIT BREAKERS CIRCUIT 2 c82 L2 me nup S CIRCUIT cal Lam eaj 13 EQUIPMENT GROUND A L3 IS NOT PRESENT ON P ELECTRIC HEATERS A THE NUMBER OF CIRCUITS VARY ACCORDING MODEL REFER TO FAN COIL NAI TUAL NUMBER EMPLOYED REFER TO FACTORY BLOWER SPEED SELECTION CHART ON UNIT FOR BLOWER SPEED INFORMATION NEC CEC CLASS 2 3VA USE OPPER CONDUCTORS ONLY TO UNIT RATING PLATE FOR REFER MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVERCURRENT PROTECTION SIZE 9 9 VOLTAGE ONLY 4 LIER A 15 CON
40. metal screws F Condensate Drain A 5 127mm section of PVC pipe is provided with the unit Cut the pipe in half and use to route the auxiliary and main drains Connect main condensate drain and route downward to an open drain or sump Do not connect drain to a closed waste system Refer to figure 20 for typical condensate trap configuration TYPICAL CONDENSATE DRAIN CONNECTION PIPE DIAMETER DIFFERENCE MINIMUM 1 INCH 25 mm PITCH PER 10 FEET 3048 mm OF LINE Trap must be deep enough to offset maximum static difference Generally 2 inches 54mm minimum FIGURE 20 It is recommended that the auxiliary drain be connected to a drain line for all units If auxiliary drain is not connected it must be plugged with provided cap For downflow units the auxiliary drain MUST be connected and routed to a drain See figure 21 for auxiliary and main drain locations RIGHT HAND DISCHARGE pene oo LEFT HAND DISCHARGE UPFLOW OR DOWNFLOW MAIN DRAIN ON RIGHT AUXILIARY DRAIN ON LEFT FIGURE 21 The following practices are recommended to ensure con densate removal 1 Drain piping should not be smaller than the drain con nections at drain pan 2 A trap must be installed in the main drain line 3 The trap must be deep enough to offset the difference in static pressure between drain pan and atmosphere Gen erally two inches is satisfactory for medium static applica tions 4 Horizontal
41. mpacity includes the Blower Motor Full Load Amps Page 7 10 kW 6 Ibs 12 5 kW 10 Ibs 15 kW 12 Ibs 20 kW 19 Ibs of Model Number Steps 29 5 28K31 Terminal Block ECB29 5CB 28K32 30A Circuit breaker ECB29 6 47L22 Terminal Block ECB29 6CB 47L23 35A Circuit breaker ECB29 8 28K33 Terminal Block ECB29 8CB 28K34 45A Circuit breaker ECB29 9CB 10L11 50A Circuit breaker ECB29EH 9CB 91K67 50A Circuit breaker ECB29 10 28K35 Terminal Block ECB29 10CB 28K36 60A Circuit breaker ECB29 12 5CB 28K37 1 25A amp 1 50A Circuit breaker ECB29EH 12 5CB 91K68 1 25A amp 1 50A Circuit breaker ECB29 15CB 28K38 1 30A amp 1 60A Circuit Breaker ECB29EH 15CB 91K69 1 30A amp 1 60A Circuit Breaker ECB29 20CB 11L31 1 50A amp 1 60A Circuit Breaker ECB29EH 20CB 91K70 1 50A amp 1 60A Circuit Breaker THREE PHASE ELECTRIC HEAT 5 Ibs 10 kW 6 Ibs 15 kW 12 Ibs 20 kW 19 lbs 29 8 28 42 Terminal Block ECB29 10 28K43 Terminal Block ECB29 15CB 28K44 1 50A Circuit breaker ECB29 20CB 28K45 2 35A Circuit breaker No 1 Volts 208 220 230 240 208 220 230 240 208 220 230 240 208 220 230 240 208 220 230 240 208 220 230 240 208 220 230 240 208 220 230 240 208 220 230 240 TABLE 3 CBX32M 036 AND CBX32M 042 ELECTRIC HEAT DATA SINGLE PHASE ELECTRIC HEAT
42. re Limits Both the primary 515 and secondary 520 limits are lo cated on the electric heat vestibule panel and are exposed directly to the airstream through an opening in the panel The high temperature limits are SPST N C limits with the primary limit being an auto reset limit and the secondary limit being a one time limit One time limits need to be re placed when opened The limits are factory set and are not adjustable 208 230 Volt Electric Heat Sections Each stage of the 208 230 electric heat is protected by a primary 815 and secondary S20 high temper ature limit Both 515 and S20 are located in the same housing Each stage use the same style of limits Both the primary and secondary limits are wired in series with a heat element When either 515 S20 opens the corre sponding heat element is de energized All other heating elements remain energized The primary high temperature limit opens at 150 F 5 F 65 5 C 2 8 C on a temperature rise and automatically resets at 110 F 9 F 43 3 5 0 C on a temperature fall The secondary high temperature limit opens at 333 F 10 F 167 2 C 5 6 C on a temperature rise If the secondary limit opens it will need to be re placed 3 Circuit Breaker CB1 CB2 and CB3 208 230 volt only Line voltage connections are made to circuit breakers CB1 CB2 and CB3 in the electric heat sections with circuit breakers designated by CB in the model numbers T
43. runs must be sloped 1 25mm per 10 feet 3 1m of drain line to offset friction 5 An open vent in drain line will sometimes be required due to line length friction and static pressure 6 Drains should be constructed in a manner to facilitate fu ture cleaning and not to interfere with filter access See fig ure 20 7 Auxiliary drain should run to an area where homeowner will notice it draining Refer to local codes Page 16 V START UP OPERATION A Preliminary and Seasonal Checks 1 Make sure the unit is installed in accordance with the installation instructions 2 Inspect electrical wiring both field and factory installed for loose connections Tighten as required 3 Check voltage at disconnect switch Voltage must be within range listed on the nameplate If not consult the power company and have voltage condition corrected be fore starting unit 4 Check to ensure that refrigerant lines are in good condition and pipe insulation is intact 5 Inspect condition of condensate drain pan and piping as sembly Disassemble and clean seasonally B Cooling Start Up NOTE The following is a generalized procedure and does not apply to all thermostat control systems Electronic thermostat control systems may operate differently 1 Set fan switch to AUTO or ON and move the system selec tion switch to COOL Adjust the thermostat to a setting far enough below room temperature to bring on the compres sor Compressor will star
44. t No field wiring is required The wiring diagrams show fac tory set blower speeds To run the blower on high speed refer to the installation instructions All speeds shown are minimums Do not change motor taps to operate at speeds lower than those shown in the tables H Blower Motor Capacitor C4 CBX32M series units use single phase direct drive motors with a run capacitor The run capacitor is mounted on the blower housing See figure 4 Capacitor ratings are shown in table 1 TABLE 1 CBX32M BLOWER RATINGS UNIT HORSE POW CAPACITOR ER RATING 018 024 1 5 HP 7 5MFD 370V ome ome perso e see por oe EE 777 wee Er l Coil CBX32M series units have dual slab coils arranged in an configuration Each coil has two or three rows of copper tubes fitted with ripple edged aluminum fins An expansion valve complete with screen feeds multiple parallel circuits through the coils The coil is designed to easily slide out of the unit cabinet J Plastic Drain Pans Both upflow downflow and horizontal drain pans are pro vided and installed on CBX32M units The drain pans are made from fiberglass filled plastic The drain hole on hori zontal pans used for right hand discharge only and must plugged when the unit is configured for left hand discharge Page 6 TABLE 2 CBX32M 018 024 AND CBX32M 030 ELECTRIC HEAT DATA
45. t and cycle on demand from the thermostat 2 The refrigerant circuit is charged with R410A refriger ant See condensing unit rating plate for correct charge amount 3 Refer to the correct condensing unit service manual for more information C Heating Start Up 1 Set the fan switch to AUTO or ON move the sys tem selection switch to HEAT Adjust the thermostat setting above room temperature 2 The indoor blower immediately starts and the electric heat will stage on based on sequencer timing D Safety or Emergency Shutdown Turn off unit power at circuit breaker E Extended Period Shutdown Turn off thermostat or set to UNOCCUPIED mode Turn off power to unit All access panels and covers must be in place and secured The condensate assembly should be clean and dry for ex tended period shutdown Page 17 VI TYPICAL OPERATING CHARACTERISTICS A Blower Operation and Adjustment NOTE The following is a generalized procedure and does not apply to all thermostat controls 1 Blower operation is dependent on thermostat control system 2 Generally blower operation is set at thermostat sub base fan switch With fan switch in ON position blower operates continuously With fan switch in AUTO posi tion blower cycles with demand 3 In all cases blower and entire unit will be off when the system switch is in OFF position B External Static Pressure 1 Measure tap locations as shown in figure 22 STATIC PRESSURE TE
46. udes the Blower Motor Full Load Amps Page 9 III OPTIONAL ECB29 ELECTRIC HEAT A Matchups and Ratings Tables 2 through 4 show all approved CBX32M to ECB29 matchups and electrical ratings B Electric Heat Components ECB29 parts arrangement is shown in figures 5 through 9 All electric heat sections consist of components mounted to the electric heat vestibule panel and electric heating elements ex posed directly to the airstream 208 230V electric heat sec tions may be equipped with circuit breakers The circuit breakers are designated by CB in the model number 460 and 575 volt electric heat sections are equipped with fuses The electric heat section is connected to the unit via jack J2 which plugs into plug P2 of the unit 1 Electric Heat Sequencer Relays K32 K33 K34 K35 K116 K117 208 230 volt only Relays K32 K33 K34 K35 K116 and K117 are N O sequencer relays with a resistive element for a coil and a bi metal disk which actuates the contacts The relays are located on the electric heat vestibule panel and are energized by a 24V heating demand W1 W2 and W3 via jack plug 2 When energized the internal resist ance heats the bi metal disk causing the contacts to close When the relay is de energized the disk cools and the contacts open The relays energize different stages of heat as well as the blower The blower is always first on and last off 2 Primary S15 amp Secondary S20 Temperatu
47. w application metal or class supply and return air plenums must be used For downflow installation on combustible flooring an addi tive base must be used See figure 13 COMBUSTIBLE FLOOR PROPERLY SIZE ADDITIVE BASE FLOOR OPENING FIGURE 13 Cut an opening appropriately sized for combustible base Base dimensions are shown in figure 14 After opening has been cut set the additive base into opening Connect outlet air plenum to the additive base Set the unit on the additive base so flanges of the unit drop into the base opening and seal against the insula tion strips Seal around the insulation strips with permagum The unit is now locked in place Install return air plenum and secure with sheet metal screws DOWNFLOW COMBUSTIBLE BASE DIMENSIONS 18 1 4 464 CB29M 21 26 amp 31 CBX32M 21 26 23 114 591 29 41 65 CBX32M 31 65 15 381 20 508 29 21 26 amp 31 29 41 65 CBX32M 21 26 2 31 65 22 118 p p 562 13 3 8 340 Opening Y T D 320 SIDE VIEW FIGURE 14 D Horizontal Right Hand Discharge Application 1 Discard drip shields if applicable The shields are used for downflow applications only Page 14 2 Place blower coil on its right side 3 No further adjustment is necessary Set unit so it is sloped towards the drain pan 1 4 6mm See fig ure 15 NOTE For horizontal applications a secondary drain pan is recommended Refer to loc
48. wing procedures All procedures assume the unit has not been modified from the factory A Disassembly of CBX32M Cabinet For tight applications where a modular design is an advan tage the CBX32M unit can be easily disassembled and re assembled By removing four screws the coil lifts off so the unit is in two parts To disassemble the CBX32M use the following procedure 1 Remove the two black screws located just above the seam in the top half of the unit 2 Remove the front access panel and remove the two screws on the inside of the top half of the cabinet on both sides Lift the top section apart from the bottom section To lighten the cabinet for lifting the blower and coil as semblies can also be removed Reassemble once the cabinet is in place Page 13 B Upflow Application 1 Discard drip shields if applicable The shields are used for downflow applications only and are located with the foam pads on top of new units For best efficiency and air flow the horizontal drain pan should be removed from units in upflow configu rations After removing horizontal drain pan place unit in de sired location Set unit so that it is level Connect return and supply air plenums as required using sheet metal screws See figure 10 UPFLOW CONFIGURATION HORIZONTAL DRAIN PAN UPFLOW DOWNFLOW DRAIN PAN Sa FOR OPTIMUM PERFORMANCE REMOVE HORIZONTAL DRAIN PAN FIGURE 10 C Downflow
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