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Carrier 50EJ Air Conditioner User Manual

1. LEGEND FPS Freeze Protection Switch HPS High Pressure Switch LPS Low Pressure Switch Fig 44 Typical Refrigerant Circuiting 50EJ EK EW EY038 044 47 ect FPS 2 12 PASS ha prea 12 PASS amp E T le PASS II Cul 4 PASS 12 55 4 Loes j gi i pue PASS CERIS 12 4 55 a ae E PASS x LE T EX 4 EAS 12 55 ae eee 19 PAS e PASSA 4 PASS Liquid Line 4 PASSL Filter Drier 4 55 l4 LEA Ce Fusible Fusible H 4 PASS Ps pares BEEN a T Cu 2 4 55 n gt T 4 PASSI Lo et 12 55 Lx nace le PASS 4 55 12 PASS Tenes Circuit 2 C 47 PASS 3 FS paced 12 PAS 4 PASS IL LL T 4 PASS 12 14 55 L 4 PASS E 4
2. LIQUID TEMPERATURE AT LIQUID VALVE DEG F LIQUID PRESSURE AT LIQU Fig 42 Cooling Charging Chart Sizes 038 048 TROUBLESHOOTING Typical refrigerant circuiting diagrams are shown in Fig 43 45 HHIBHBOSI gt tess 4 PASS gpa d ca Pass Fy ae FA H 4 PASS f ua amma 7 4 55 n Circuit 1 al vere TPES n a r ZA PASS 4 PASS 4 55 dt 4 PASS FEAST LER 2 55 d RE EFE 4 1 HPS LPS amp Fusible Tee Cete mounted on conpressor Filter Drier Muffler PRS 4 455 4 55 4 552 A PASS Fusible 2 55 Plug
3. 94 OVERALL LIFTING 2388 Qyepalt Lit 3 4 2 891 5 1 8 1130 12 15 16 5 13281 revue RETURN a x i 1323 16 sum 11 VIEW A D 6 31 32 um 91 25 32 12 5 8 2484 1321 NOTES 1 Weights include economizer Std 2 Center of gravity 3 Do not locate adjacent units with discharge facing economizer inlet Minimum clearances to be Adjacent Units 15 0 Top of Units No overhang Condenser Coil 4 0 Economizer Side 6 0 Filter Access Side 10 0 for removal of evaporator coil For smaller service and operational clearances contact Carrier Application Engineering department Dimensions are in inches Dimensions in are in millimeters Forunits equipped with electric heat a field supplied 90 elbow must be installed in the supply ductwork below the unit discharge For side supply return applications a single return and supply duct work connection is recommended for covering both return and both supply air openings OM Fig 6 Base Unit Dimensions ACCESS PANEL 32 23 32 831 215 13 32 5411 ACCESS DOORS HINGED CONTROL BOX COMPRESSOR 42 518 10831 13 1 8 118571 1 8 DIA 221 LOW VOLTAGE 29 13 32 141 24 13 32 6201 82 1 32 20831 INSIDE RAILS 3 76 LEGEND VFD Variable Frequency Drive OPERATING UNIT SIZE WEIGHT 50E
4. lt A BET sn m h 669 811 913 FET 610 m D 8 8 m 719 LLA 09 zx 2 9 4 p 1 zi 99 SZA IET 1 Y n z P 622 22 62 J 2 9393 0 3 T que sou 282 o mC ae 5 12 ela 5 uem 82 2 Anas Bru ca 983 Ta X gt ty a v3 4 9 5 2 ca 99 32 i CP I 18 018 cdd 2 1 2 DYN e J 55 4 2 80M 199 m In tz ova ro 51 56 12 22m lt Ir Ei 9 962 jus 191 va 22 41 2 DUO Fo 5 aC D vam MS yt ex 9 led DIS un 1 su x 8 4c m 4 a B C in in 0219 erry oH Fig 12 Control Board Diagram For units running Version 1 0 of the unit control software network access software is required to enable occupied heat ing For units running Version 2 0 of the unit control soft ware occupied heating is enabled or disabled by the posi tion of DIP switch no 5 Additional features may be provided with electronic ac cess to Unit Control Board These features are control board diagnostics compressor time guard override power up minimum off and on times compressor lockout during low supply air temperature electronic expan
5. 1075 1 1 1 1 EVAPORATOR COIL Cross Hatched 3 Copper Tubes Aluminum or Copper Plate Fins Intertwined Circuits Rows Fins in 4 15 4 15 4 15 4 15 Total Face Area sq ft 31 7 31 7 31 7 31 7 EVAPORATOR FAN Centrifugal Type Quantity Size in 2 20x15 2 20x15 2 20x15 2 20x15 Type Drive Belt Belt Belt Belt Nominal 8 000 10 000 11 000 12 000 Motor Hp 5 1011 15 1011 15 10 154 20 10 1571 20 Motor Frame Size S184T S215T S254T um S254T S215T S254T S256T S215T S254T S256T Motor Bearing Type Ball Ball Ball Maximum Allowable Rpm 1200 1200 1200 1200 Motor Pulley Pitch Diameter 4 6 6 6 6 9 4 9 6 1 7 1 6 6 6 7 7 5 6 4 6 9 7 5 Nominal Motor Shaft Diameter in 1 1 1 1 1 1 198 158 198 198 1 1 Fan Pulley Pitch Diameter in 11 1 12 5 11 1 11 1 11 1 11 1 13 7 11 1 11 1 12 5 11 1 1 Nominal Fan Shaft Diameter in 16 1146 1146 1146 Belt Quantity Type 1 BX59 1 BX60 1 5VX590 BX56 1 56 1 5VX590 1 BX62 1 5VX590 1 5VX600 BX60 1 5VX590 1 5VX600 Belt Length in 62 63 59 59 59 59 65 59 60 63 59 60 Pulley Center Line Distance in 16 0 18 7 15 6 18 4 15 0 17 9 15 6 18 4 15 6 18 4 15 0 17 9 15 6 18 4 15 0 17 9 15 6 18 4 15 0 17 9 Factory Speed Setting rpm 725 924 1088 778 962 1119 843 1056 1182 896 1088 1182 HIGH PRESSURE SWITCH psig Cutout 426 426 426 426 Reset Auto 320 320 320 320 LOW PRESSURE SWITCH psig Cutout do 7 Reset
6. Determine maximum deviation from average voltage 457 452 5v 464 457 7 v 457 455 2v Maximum deviation is 7 v Determine percent of voltage imbalance Voltage Imbalance 100 x 457 1 5396 This amount of phase imbalance is satisfactory as it is below the maximum allowable 2 IMPORTANT If the supply voltage phase imbalance is more than 296 contact your local electric utility company immediately 3 MCA calculation for units with electric heaters over 50 kW 1 25 x IFM amps 1 00 x heater FLA Lister Liste UNIT SIZE NOMINAL VOLTAGE 3 Ph 60 Hz 208 230 VOLTAGE RANGE Table 4 Electrical Data 50EJ EK EW EY024 048 cont COMPRESSOR POWER ELECTRIC EXHAUST HEAT POWER SUPPLY 187 20 30 8 28 0 46 2 42 0 59 4 54 0 169 9 167 1 23 6 41 6 193 5 190 7 29 36 75 1 86 169 9 167 1 23 6 41 6 29 36 75 1 86 193 5 190 7 om 59 72 150 1 17 188 6 208 2 23 6 41 6 59 72 150 147 218 1 237 7 185 3 181 1 23 6 41 6 208 9 204 7 29 36 75 1 86 185 3 181 1 23 6 41 6 29 36 75 1 86 208 9 204 7 59 72 150 1 17 207 9 225 7 23 6 41 6 59 72 150 147 237 4 255 2 198 5 193 1 23 6 41 6 222 1 216 7 198 5 193 1 222 1 216 7 kW FLA MCA eo Co Oo DD oo MOCPt 225 200 250 225 225 200 250 225 225 225 2
7. Fusibte a 1 Plug 4 A PASS HPS 27 428 H T Cut in 320251 4 PASS U a Cut out 428 51 rss Par 2 HPS Snubber 5060400532 ASS a PASSI LPS 022 027 d PASS Cui in 22251 EPR i Cut out 7 51 dE 4 Circuit 2 4 55 5 LPS amp Fusible Tee r PASS mounted on compressor LPR PASS PS s Iur er d 4 557 42 Liquid Line d PASS Filter Drier ACPASS L z sS Fusible MD FPES LL d ERST C 4 55 4 z PASS C 4 PASSF n aga DER SSI ga PASS 4 i P pares sm 4 PASS ovt L PR NS wm LEGEND FPS Freeze Protection Switch HPS High Pressure Switch LPS Low Pressure Switch Fig 43 Typical Refrigerant Circuiting 50EJ EK EW EY024 034 46 HPS LPS amp Fusible or Relief Valve qc HPS 0 2 42 Cut in 320 51 Cut out 428 1 HPS Snubber 50 0400532 LPS 022 027 Cut in 5 Cut out 51 HPS LPS amp Fusible Tee or Relief Valve Fusibte
8. Muffler Fusibte 8 PASS B PASS 8 55 8 55 Carag Liquid Line Filter Dr Fusible js Circuit 2 lt N CE mue LEGEND FPS Freeze Protection Switch HPS High Pressure Switch LPS Low Pressure Switch Fig 45 Typ 50EJ EW048 48 ical Refrigerant Circuiting Diagnostic LEDs Light Emitting Diodes There are 3 LEDs red yellow and green on the lower right hand side of the control board The red light is used to check unit operation and alarms A constant pulse is normal unit operation A series of quick blinks indicates an alarm Refer to Table 20 below for a description of alarms The yellow LED blinks during transmission with the CCN Carrier Com fort Network The green LED blinks during transmission with the expansion board Table 20 Control Board LED Alarms LED ERROR BLINKS CODE DESCRIPTION 1 Normal Operation 2 HF 13 Compressor 1 Safety TROUBLESHOOTING COMMENTS The expansion board and control board flash the red LED in one second intervals when the board is operatin
9. Never operate a motor where a phase imbalance supply voltage is greater than 296 Use the following formula to determine the percent of voltage imbalance max voltage deviation from average voltage average voltage 9 gt Voltage Imbalance 100 x EXAMPLE Supply voltage is 460 3 60 452 v A B 464 v 495v 452 464 455 Average Voltage _ 1371 Erg 457 FLA ea kW 29 36 75 1 86 6 180 5 177 7 225 225 28 0 23 6 41 6 29 36 75 1 86 6 204 1 201 3 250 250 59 72 150 1 173 2 188 6 208 2 225 225 23 6 41 6 59 72 150 1 173 2 218 1 237 7 250 250 3 7 21 5 2 MOCPt FLA MCA 180 5 177 7 225 225 23 6 41 6 204 1 201 3 250 250 30 8 195 9 191 7 250 225 23 6 41 6 219 5 215 3 275 250 15 46 2 29 36 75 1 86 6 195 9 191 7 250 225 42 0 23 6 41 6 29 36 75 1 86 6 219 5 215 3 275 250 si 59 72 150 1 173 2 207 9 225 7 250 250 3 6 41 6 59 72 150 1 173 2 237 4 255 2 275 275 209 1 203 7 250 250 1 6 232 7 227 3 275 275 20 1 86 209 1 203 7 232 7 227 3 224 4 240 7 253 9 270 2 250 250 275 275 275 275 300 300 100 110 100 110 110 125 110 125 110 125 125 150 110 125 110 125 125 150 80 90 80 90 90 100 90 100 80 100 100 110 90 110 90 110 110 125 Determ
10. Off On Off Off Off Off 40 ton units have only 1 unloader Off On Off Off ff On On On FIELD TEST The field test program is initiated by mov ing up DIP switch no 4 to the OPEN position The outdoor air damper will close The control allows 90 seconds for the damper to close in case it was in the full open position Next the indoor fan contactor will be energized and the outside air damper will begin to open to its default value of 20 and stay at that position for a short period of time The outdoor air damper will then open to its full open position and stay at that position for a short period of time The outdoor air damper will then close If the unit is equipped with power exhaust stage 1 will be energized for 5 seconds If the unit is configured for stage 2 of power exhaust stage 2 will be energized for 5 seconds after the first stage is deenergized The first stage of heat will be energized for 30 seconds after which the second stage heat will be energized for an additional 30 seconds Heat is then deenergized The last step is the Cooling mode Outdoor fan contactor no is energized This is followed by each stage of cooling energized with a 10 second delay between stages After this is complete outdoor fan contactor no 2 is energized for 10 seconds The compressors will now deenergize followed by the outdoor fan contactors and indoor fan contactors The field test is then complet
11. whenever SPT is outside of the set points Unoccupied Heat or Unoccupied Cool The VFD may also be started by nighttime thermostat via remote Occupied Unoccupied input or by a temperature com pensated start algorithm When the VFD is running in a nor mal mode the control module will start heating or cooling as required to maintain supply air temperature at the supply air set point plus the reset when enabled The reset value is determined by SAT supply air temperature reset and or space temperature reset algorithms The reset is only avail able when enabled through software When cooling the control module will energize the power exhaust enable output to the external power exhaust control ler when power exhaust is used The control module will run continuous diagnostics for alarms alerts respond to CCN Carrier Comfort Network communications perform any configured network POC Prod uct Outboard Control functions such as time outdoor air tem perature broadcast and global broadcast and perform Fire Smoke control HEATING CONSTANT VOLUME CV UNITS The control module is powered by 24 vac If the unit is con trolled with a room sensor the fan will run continuously in the Occupied mode with the outside air damper in the mini mum position If the unit is controlled through a room ther mostat with FAN set to AUTO upon a call for heat the first stage of heat is energized the indoor fan motor will turn on and t
12. Never operate a motor where a phase imbalance supply voltage is greater than 296 Use the following formula to determine the percent of voltage imbalance max voltage deviation from average voltage 96 Voltage Imbalance 100 x i r hT average voltage EXAMPLE Supply voltage is 460 3 60 452 v A B 464 v 455 v 452 464 455 Average Voltage _ 1371 Erg 457 23 This amount of phase imbalance is satisfactory as it is below the maximum allowable 2 IMPORTANT the supply voltage phase imbalance is more than 2 contact your local electric utility company immediately 3 MCA calculation for units with electric heaters over 50 kW 1 25 x IFM amps 1 00 x heater FLA Listeo Listeo EXPANSION BOARD ACCESSORY ONLY BASE MODULE SWITCHES SENSOR CONNECTION LOCATION o TRANG PEC 52 54 0000 CB IFCB CCB Siri rii n e IFC orc alala Fo lo fo o
13. 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300 150 1 1 251 7 258 2 150 2 1 275 3 287 7 3 E NX w 300 300 300 300 125 125 125 125 125 150 125 125 125 125 150 150 86 6 86 6 34 6 34 6 69 3 69 3 e o NX A N D a N D 125 150 125 150 150 175 110 125 110 125 110 125 110 125 110 125 125 125 A N D 23 6 23 6 o EN o 110 125 110 125 125 125 Table 3 Electrical Data 50EJ EK EW EY024 048 cont NOMINAL VOLTAGE COMPRESSOR Eu EM POWER ELECTRIC POWER SUPPLY VOLTAGE No 1 No 2 EXHAUST HEAT 3 Ph 60 Hz wi LRA RLA LRA Qty Hp FLA Hp FLA kW FLA MCA 252 4 247 0 300 300 23 6 41 6 276 0 270 6 300 300 59 4 29 36 75 1 86 6 252 4 247 0 300 300 54 0 23 6 41 6 29 36 75 1 86 6 276 0 270 6 300 300 59 72 150 1 173 2 252 4 247 0 300 300 23 6 41 6 59 72 150 1 173 2 276 0 270 6 300 300 267 8 261 0 300 300 23 6 41 6 291 4 284 6 300 300 29 36 75 1 86 6 267 8 261 0 300 300 8212 448 949 ce 29 36 75 1 86 6 291 4 284 6 300 300 59 72 150 1 173 2 267 8 261 0 300 300 41 6 59 72 150 1 173 2 291 4 284 6 300 300 281 0 273 0 300 300 304 6 296 6 350 300 281 0 273 0 300 3
14. 455 v 452 464 455 Average Voltage _ 1371 Erg 457 No 1 No 2 RLA RLA LRA Qty Hp 7 36 43 3 71 6 80 12 6 23 6 36 43 3 87 4 90 5 2 2 17 MOCPt 125 125 150 150 125 150 150 175 200 225 225 225 150 150 175 175 101 8 100 3 23 6 41 6 125 4 123 9 29 36 114 7 127 3 41 6 29 36 144 2 156 8 115 9 113 1 139 5 136 7 16 7 kW FLA MCA 15 2 23 6 m 59 72 150 1 1 23 6 41 6 59 72 150 1 1 29 36 75 1 86 6 132 3 143 3 150 150 23 6 41 6 29 36 75 1 86 6 161 8 172 8 175 175 59 72 150 1 173 2 188 6 208 2 220 225 23 6 41 6 59 72 150 1 173 2 218 1 237 7 250 250 131 3 127 1 150 150 23 6 41 6 154 9 150 7 175 175 151 6 160 8 175 175 200 200 250 250 275 275 60 80 m T 36 43 3 63 6 70 12 6 23 6 36 4 79 4 80 e 72 86 6 96 1 110 12 6 23 6 72 86 6 111 9 125 171 0 192 2 200 5 221 7 46 2 42 0 3 181 1 190 3 207 9 225 7 55 8 70 12 6 23 6 68 4 80 72 86 6 110 12 6 23 6 72 86 6 125 80 12 6 23 6 90 36 43 3 80 4 90 12 6 23 6 36 43 3 96 1 100 72 86 6 112 9 125 12 6 23 6 72 86 6 128 6 150 40 5 50 12 6 23 6 53 1 60 36 34 6 50 9 60 12 6 23 6 36 34 6 66 7 70 72 69 3 76 9 80 12 6 23 6 72 69 3 92 7 100 45 4 60 12 6 23 6 58 0 70 36 34 6 57 1 60 12 6 23 6 36 34 6
15. ROOF CURB Assemble and install accessory roof curb in accordance with instructions shipped with the curb Ac cessory roof curb and information required to field fabricate a roof curb or horizontal adapter are shown in Fig and 2 Install insulation cant strips roofing and counter flashing as shown Ductwork can be secured to roof curb before unit is set in place IMPORTANT The gasketing of the unit to the roof curb is critical for a leak proof seal Install gasket sup plied with the roof curb as shown in Fig 1 Improp erly applied gasket can result in air leaks and poor unit performance Curb should be level This is necessary to permit unit drain to function properly Unit leveling tolerance is shown in Fig 1 and 2 Refer to Accessory Roof Curb Installation In structions for additional information as required When ac cessory roof curb is used unit may be installed on class A B or C roof covering material ALTERNATE UNIT SUPPORT When the curb or adapter cannot be used support unit with sleepers using unit curb or adapter support area If sleepers cannot be used support long sides of unit refer to Fig 3 6 with a minimum number of equally spaced 4 in x 4 in pads follows 50EJ EK EW EY 024 034 units require 3 pads on each side S0EJ EK EW EY 038 048 require 4 pads on each side Unit may sag if supported by corners only Manufacturer reserves the right to discontinue or change at any time specific
16. 10 Table 2 Evaporator Fan Motor Data FAN SHEAVE FAN SHEAVE PITCH DIAMETER BUSHING DIAMETER in BELT OUTSIDE BELT LENGTH EX MOTOR UNIT MOTOR SHAFT SHEAVE BUSHING SIZE DIAMETER SPEED SHEAVE in 5 112 725 52 16 None 1 125 024 10 1 38 954 BK72 6 6 1 375 15 1 62 1088 1B5V68 6 9 B 1 625 75 1 38 773 BK55H 49 H 1 375 028 10 1 38 962 BK67H 6 1 1 375 15 1 62 1119 1B5V70 71 1 625 10 1 38 843 BK72 6 6 None 1 375 030 15 1 62 1056 1B5V66 6 7 1 625 20 1 62 1182 18574 75 1 625 10 1 38 896 64 1 375 034 15 1 62 1088 185 68 6 9 1 625 20 1 62 1182 1B5V74 75 1 625 10 1 38 788 2BK47 41 None 1 375 038 15 1 62 966 1B5V68 6 9 B 1 625 20 1 62 1050 1B5V74 75 1 625 15 1 62 966 1 5 68 69 1 625 044 20 1 62 1035 1B5V80 8 1 1 625 25 1 88 1162 1B5V90 9 1 1 875 20 1 62 1019 2B5v52 1 625 048 25 1 88 1135 2B5V58 59 1 875 30 1 88 1182 2B5V76 75 1 875 NOTE Motor shaft speed is 1750 rpm The fan shaft diameter is 11 46 inches ROOF MOUNT Check building codes for weight distri bution requirements Step 3 Field Fabricate Ductwork Secure all ducts to building structure Use flexible duct connectors be tween unit and ducts as required Insulate and weatherproof all external ductwork joints and roof openings with counter flashing and
17. 2 j IDA HOIH c LAUR 5 SADW d a PADI T C gt w C gt gt SLLE C gt S o 96 65 2 B zu 1 2 N g B 9 9 E oz 3 622 C 0 9 9 5 29 829 m 5 35 219 4 2 0 22 40 lt gt 9 175 ora 3 g lt gt gt 804 u woo LAS C eu su J 1 osa 2 2 858 ica 8 ac 90 es 6 ms en RES LE 008 21 701 gt 13 pus t 968 Ge A 52 99 3 lt gt 21 264 904 t 2 9E 33 1 Lo eC JC ko pem o 9 gm 81 SEL C E a Lx WOO cC S 4 r 94 ve 2 C AX SOC sC F sva ts see Spose LE 80 122 06 C e un el ecu C Od 1 cM 251 LIL 5 10 eu ri 9 WOO 4 Erd cin cod 924 Gr Lo 200 O orn 883 88 22 Z vin WOO x 82 B IAS en iu a gt GEN co 644 E ES JM BEES eee 8n a mo tr 5 256 ova 5 s Tra era Z m 5 4014 d val 921 5 o 60 u z D 9 5 25 2 2 525 1 ig 9 p o n W is
18. 88 1 4 22411 TOP COVER FILTER ACCESS DOOR HINGED INDOOR MOTOR ACCESS DOOR 171251 NPT HINGED DRAIN CONN ECONOMI ZER AIR RETURN gt AIR SUPPLY AIR 23 21 32 601 49 11 32 1258 88 2235 BASE FRAME 91 12 3 8035 91 112 LIFTING POSITION LIFTING LUG OVERALL LIFTING 12388 SHIPPING DIM 3 1 2 8914 12 15 16 RETURN 13281 RETURN 1 821 85 INDOOR BLOWER HEAT SECTION ACCESS PANEL ACCESS PANEL 81 11 16 122211 49 mol _ _ 1250 165 3 32 141931 2 1 2 64 DIA FIELD WIRING 2 NOTES 1 Weights include economizer Std 2 e Center of gravity 3 not locate adjacent units with discharge facing econo mizer inlet Minimum clearances to be Adjacent Units 15 0 Top of Units No overhang Condenser Coil 4 0 Economizer Side 6 0 bol Access Side 10 0 for removal of evaporator coi 4 For smaller service and operational clearances con tact Carrier Application Engineering department 5 Dimensions are in inches Dimensions in are in millimeters 6 For units equipped with electric heat a field supplied 90 elbow must be installed in the supply ductwork be low the unit discharge 7 For side supply return applications a single return and supply ductwork connection is recommended for cov ering
19. HINGED INDOOR BLOWER ACCESS PANEL HEAT SECTION ACCESS PANEL HEAT SECTION ACCESS PANEL 1 8 22 DIA LOW VOLTAGE 22 11132 49 7132 81 11 16 5121 12501 2221 11 1132 165 3 32 445 141931 Tt 30 1 32 FIELD WIRING 2 5 5 8 1143 FILTER ACCESS DOOR HINGED INDOOR MOTOR ACCESS DOOR HINGED 1 25 DRAIN CONN ECONOMI ZER AIR 23 21 32 EXHAUST 8011 AIR SUPPLY AIR 49 11 32 112581 11 15 32 14441 RETURN AIR 22951 BASE FRAME 3 8 35 DIA 91 172 HOLE IN LIFTING LUG 1 1 2 LIFTING POSITION 94 OVERALL LIFTIN 2388 SHIPPING DIM NOTES 1 2 3 Weights include economizer Std Center of gravity Do not locate adjacent units with dis charge facing economizer inlet Mini mum clearances to be Adjacent Units 15 0 Top of Units No overhang Condenser Coil 4 0 Economizer Side 6 0 Filter Access Side 10 0 for re moval of evaporator coil For smaller service and operational clearances contact Carrier Applica tion Engineering department Bottom ducts designed to be attached to accessory roof curb If unit is mounted on dunnage it is recommended the ducts be supported by cross braces as done on accessory roof curb Dimensions are in inches Dimen sions in are in millimeters For units with electric heat a field su
20. fire smoke purge modulated power exhaust override A field supplied space temperature sensor can be added to provide the following T 57 sensor will monitor room temperature T 55 sensor will monitor room temperature and provide unoccupied override capability 1 hour When the unit is equipped with a field supplied space tem perature sensor and a remote contact closure remote start stop the occupied default set points will monitor unit op eration The occupied default set points are 55 F supply air cooling and 68 F space temperature heating if electric heat is installed See Fig 11 for remote start stop wiring NOTE For units without a space temperature sensor and which have not had the base unit control board accessed via soft ware to set an occupancy schedule the remote start stop clo sure will allow the unit to operate in the pre configured oc cupied default set points of 55 F supply air temperature cooling and 68 F return air temperature heating Without 15 an occupancy schedule the unit will control to the unoccu pied default set points of 90 F return air cooling and 55 F return air heating if electric heat is installed Features with Network Applications The base control board provides as standard a connection for use with a Carrier Comfort System and can also be integrated into a Carrier Comfort Network When the unit is accessed via a PC equipped with Comfort Works Building Supervisor o
21. 55 12 d aca pere 4 55 2 55 12 ass lnc ie Pass 4 PASS gene oper TES 19 PASS 4 PASSIL IU Rem EFAS 1228855 Bases amp PassL Liquid Line Pass Fitter Drier 4 PASS 6 PASS Fusible re HPS LPS amp Relief Valve 6 PASS 6 lt 6 55 6 55 6 PASS E PASS 6 SPAS amp PASS 6 55 pe ass 7 6 PA 6 PA eras ras 6 55 6 55 amem PASS 6 Fusible Plug Muffler Cee B PASS B PASS PASS 8 PASS HPS 022 428 Cut in 320PSI Cut out 428PSI HPS Snubber 50 0400532 LPS 922 027 Cut in 67PSI Cut out 27PSI HPS LPS amp Relief Valve Liquid Line Filter Drier jEusiele Plug Circuit 1 FPS HHIBHBO31 em 6 55 6 PASS PASS E PASS E PASS 6 55 16 PAS 76 55 6 55 E PASS 6 6 P EPA G PASS 6 55 6 55 EPA J FFE
22. Auto 22 RETURN AIR FILTERS Quantity Size in 10 20x24x2 10 20x24x2 10 20x24x2 10 20x24x2 OUTDOOR AIR FILTERS 8 16 25 8 16 25 8 16 25 8 16 25 Quantity Size in 4 20x25 4 20x25 4 20x25 4 20x25 POWER EXHAUST Direct Drive 3 Speed Single Phase Motor Factor Wired For High Speed and Forward Curved Fan Motor Quantity Hp eed Fan Diameter Width in 10 LEGEND NOTES 1 See Table 2 for evaporator fan motor data Al Aluminum 2 Sizes 038 and 048 are 50EJ EW units only Cu Copper Weight of unit does not include variable frequency drive VED one power VFD VFD WEIGHTS Ib exhaust If a VAV unit a VFD is installed add the VFD weight in the table at right Evaporator coil fin material condenser coil fin material Hp 208 230 v Br v Sizes 024 034 Circuit 1 uses the lower portion of condenser coil Circuit 2 uses the upper 5 60 portion Sizes 038 048 Circuit 1 uses the left condenser coil Circuit 2 the right All units 7 64 ave intertwined evaporator coils 5 ttMotor and drive shown will deliver approximately 2 5 in wg net external static For more 10 64 drive information see Table 2 15 109 20 109 25 174 30 180 Table 1 Physical Data cont NOMINAL CAPACITY tons 45 OPERATING WEIGHT Ib Unit AVAIT 4282 4508 4795 Al Cut 4567 4793 5175 Roof Curb 14 in curb 410 410 410 COMPRESSOR Type Ckt1 06D537 06 250 06 265 Ckt 2 06D537 06 250 06 250
23. For 50 to 75 ft use no 16 AWG insulated wire 35 C minimum For over 75 ft use no 14 AWG insulated wire 35 C minimum wire larger than no 18 AWG cannot be directly con nected to the thermostat and will require a junction box and splice at the thermostat Set heat anticipators settings to 0 1 for all voltages Set tings may be changed slightly to provide a greater degree of comfort for a particular installation Sensor Wiring CV or VAV The temperature sensor is wired into the unit control board See Fig 17 The unit is controlled with a T55 T56 CV only or T57 zone sensor Terminal TH on the sensor is connected to 1 of the base module board Terminal COM on the sensor is connected to T2 on the base module board If a T56 set point override sensor is used the override connection SW on the sensor is connected to T3 on the base module board VAV units using Version 1 0 of the unit control software may operate without a space temperature sensor during oc cupied schedules but unit will not provide unoccupied heat ing or cooling VAV Units VAV units require a field supplied heat inter lock relay HIR to drive the air terminal wide open when in heat mode The HIR part number 15 HN61KK041 Remote Field Control Units Running Version 1 0 of Unit Control Software A switch closure across terminals R and Y1 on TB 3 will initiate the Occupied mode This can be done manually as well as through a field supplied
24. Ib 1368 CORNER WEIGHT Ib 1302 1409 1505 W Y044 50EW038 048 and 50 044 Step 2 Rig and Place Unit Inspect unit for trans portation damage File any claim with transportation agency Keep unit upright and do not drop Use spreader bars over unit to prevent sling or cable damage Rollers may be used to move unit across a roof Level by using unit frame as a reference leveling tolerance is shown in Fig 1 and 2 See Fig 7 for additional information Unit weight is shown in Table 1 NOTE On retrofit jobs ductwork may be attached to old unit instead of roof curb Be careful not to damage ductwork when removing unit Attach existing ductwork to roof curb instead of unit CENTER OF GRAVITY Four lifting lugs are provided on the unit base rails as shown in Fig 7 Refer to rigging instructions on unit POSITIONING Provide clearance around and above unit for airflow safety and service access Fig 3 6 Do not install unit in an indoor location Do not locate air inlets near exhaust vents or other sources of contaminated air Although unit is weatherproof guard against water from higher level runoff and overhangs CAUTION NOTICE TO RIGGERS ALL PANELS MUST BE IN PLACE WHEN RIGGING NOTE Rig with four cables and spread with two 92 in 2337 mm spreader bars Maintain a dis tance of 74 in 1880 mm from top of unit to eyehook NOTE Add 32 Ib 14 5 kg for do
25. timeclock Table 4 Electrical Data 50EJ EK EW EY024 048 VOLTAGE COMPRESSOR NOMINAL UNIT VOLTAGE SIZE OFM POWER EXHAUST ELECTRIC HEAT POWER SUPPLY 3 Ph 60 Hz LRA 208 230 187 254 3 5 6 024 414 508 32 9 1 19 9 16 0 Heater capacity KW is based on heater voltage of 208 v 240 v 480 v and 575 v If power distribution voltage to unit varies from rated heater voltage heater kW will vary accordingly TFuse or HACR circuit breaker NOTES 1 In compliance with NEC requirements for multimotor and combination load equip ment refer to NEC Articles 430 and 440 the overcurrent protective device for the unit shall be fuse or HACR breaker The Canadian units may be fuse or circuit breaker 2 Unbalanced 3 Phase Supply Voltage Never operate a motor where a phase imbalance supply voltage is greater than 296 Use the following formula to determine the percent of voltage imbalance max voltage deviation from average voltage average voltage LEGEND FLA Full Load es HACR Heating Air Conditioning and Refrigeration IFM Indoor Evaporator Fan Motor LRA Locked Rotor Amps MCA Minimum Circuit Amps Maximum Overcurrent Protection NEC National Electrical Code OFM Outdoor Condenser Fan Motor RLA Rated Load Amps Voltage Imbalance 100 x EXAMPLE Supply voltage is 460 3 60 452 v A 464 v
26. 115 V This control circuit is pro tected against overcurrent by a 5 0 amp circuit breaker CB3 Breaker can be reset If it trips determine cause of trouble before resetting Compressor Lockout Logic If any of the safe ties trip the circuit will automatically reset providing the safety has reset and restart the compressor in 15 minutes If any of the safeties trip 3 times within a 90 minute period then the circuit will be locked out and will require manual resetting by turning off either the unit disconnect or the con trol circuit breaker or opening the thermostat Replacement Parts complete list of replacement parts may be obtained from any Carrier distributor upon request CIRCUIT 1 038 048 CIRCUIT 2 044 048 ALL OUTDOOR FANS MUST BE OPERATING 1404 120 ADD CHARGE IF ABOVE CURVE 80 REDUCE CHARGE IF BELOW CURVE LIQUID TEMPERATURE AT LIQUID VALVE DEG F 50 100 150 200 250 300 350 400 LIQUID PRESSURE AT LIQUID VALVE PSIG CIRCUIT 2 038 ALL OUTDOOR FANS MUST BE OPERATING FTTTTTTH 140 NI 120 ADD CHARGE IF ABOVE CURVE 100 80 REDUCE CHARGE IF BELOW CURVE 60 40 EON SEY 50 100 150 200 250 300 350 400 VALVE PSIG
27. 90 F SPT Unoccupied Heating 55 5 CV or VAV Unit with SPT Sensor Occupied Cooling NA Occupied Heating CV Unit with SPT Sensor and Remote Unoccupied Cooling 90 F SPT Unoccupied Heating 55 5 Start Stop Switch Occupied Cooling 78 F SPT Occupied Heating 68 F SPT i Unoccupied Cooling 90 F RAT Unoccupied Heating 55 F RAT VAV Unit Remote Start Stop Switch Only Occupied Cooling 55 F SAT Occupied Heating 68 F RAT VAV Unit with SPT Sensor and Remote Unoccupied Cooling 90 F SPT Unoccupied Heating 55 F SPT Start Stop Switch Occupied Cooling 55 F Occupied Heating 68 F RAT LEGEND With DIP Switch No 5 configured to OPEN Occupied Heat Enabled CV Constant Volume SAT Supply Air Temperature ald NA Not Available SPT Space Temperature NOTE Space temperature sensor and remote stop switch are field supplied RAT Return Air Temperature VAV Variable Air Volume 12 Features with sensor control of unit with computer access are 365 day timeclock with backup supports minute hour day of week date month and year daylight savings time function occupancy control with 8 periods for unit operation holiday table containing up to 18 holiday schedules ability to initiate timed override from T 55 or T 56 sensors ability to use multiple space temperature sensors to aver age the space temperat
28. CLOSED CV Board Only OFF Electric Heat Operation Constant CV Thermostat Volume Power Exhaust LEGEND 1 The OPEN side of the DIP switch is marked OPEN When the EUM pere E Network rocker switch is on the OPEN side of the switch the switch is e Variable Air Volume 2 The configuration of DIP switches 2 and 5 are dependent on DIP switch 1 If DIP switch 1 is set to OPEN operation then DIP switches 2 and 5 will configure CV functions 3 When the unit is field tested DIP switch 4 to OPEN the function of DIP switch 6 changes and it is used to set the minimum damper position Table 11A DIP Switch Factory Settings Version 1 0 of Unit Control Software UNT 1 2 3 4 5 6 7 8 SOEJ EW Closed SOEKIEY Closed Table 11B DIP Switch Factory Settings Version 2 0 of Unit Control Software Wi TUG HE TG ee ee SOEJ EW Closed SOEK EY Closed 34 switch configurations for Version 1 0 of the Unit Con trol Software are as follows DIP switch 1 configures the unit to operate as a variable air volume VAV or constant volume CV unit DIP switch 2 configures what type of sensors or thermo stats are used with the unit DIP switch 3 configures the DDC for use with the elec tronic expansion board DIP switch 4 is used to field test the unit DIP switch 5 configures the unit to use constant volume or modulated power exha
29. CONDENSER COIL VIEWED FROM ACCESS PANEL XR Fig 33C Motormaster Ill Sensor Location Size 048 START UP Use the following information and Start Up Checklist on page CL 1 to check out unit PRIOR to start up Unit Preparation Check that unit has been installed in accordance with these installation instructions and appli cable codes Compressor Mounting Loosen the compressor hold down bolts until sidewise movement of the washer under each holddown bolt head can be obtained Do not loosen completely as bolts are self locking and will maintain adjustment Service Valves Ensure that the suction discharge and liquid line service valves are open Damage to the com pressor could result if they are left closed Internal Wiring Check all electrical connections in unit control boxes tighten as required Refrigerant Service Ports Each refrigerant sys tem has one suction port located in the top of the compressor motor casing All units also have one service port on the liq uid line valve and one on the compressor discharge valve Be sure that caps on the ports are tight Variable Frequency Drive VFD The variable fre quency drives are factory set These settings include factory installed jumpers and software configurations The only configured set point is duct static pressure An Operation Manual is shipped with each VAV unit This manual should be used if the drive needs to be customized for a part
30. If the Y2 remains energized and the SAT reading remains above the set point for 15 minutes com pressor 2 will turn on If Y2 is deenergized at any time only the last stage of compression that was energized will be turned off If outdoor conditions are not suitable for economizer cool ing the economizer will go to minimum position and cycle compressors and 2 based on demand from Y1 and 2 re spectively The compressors will be locked out when the SAT temperature is too low less than 40 F for compressor 1 and less than 45 F for compressor 2 After a compressor is locked out it can restart after normal time guard period The Time Guard function maintains a minimum off time of 5 minutes a minimum on time of 10 seconds and a minimum delay before starting the second compressor of 10 seconds When heating the heat stages respond to the demand from W1 and W2 of the thermostat input Heating and cooling will be mutually locked out on demand on a first call basis The heating and the cooling functions cannot operate simultaneously COOLING VARIABLE VOLUME UNITS On power up the control module will activate the initialization software The initialization software reads DIP switch no 1 position to determine CV or VAV operation The initialization se quence clears all alarms and alerts re maps the input output database for VAV operation sets maximum heat stages to 1 and sets maximum cool stages to 6 The control module reads DI
31. Insert the plug into the existing 3 pin mating connector on the base module in the main control box Step 8 Make Outdoor Air Inlet Adjustments ECONOMIZER NOTE If accessory power exhaust or barometric relief pack ages are being added to the unit install power exhaust or barometric relief before installing economizer hoods Economizer Hood Assembly The economizer hood is shipped in a package secured to the outside of the unit and must be field assembled There are 2 hoods on every unit The 50EW EY units are side supply and side return The re turn duct limits access to economizer filters from below Fil ter tracks mounting angle without tabs must be installed correctly to allow access to economizer filters from each side Perform the following procedure to assemble the econo mizer hood NOTE Before assembly of the economizer hood check along the outer edges of the economizer assembly for any seal strip protruding past the flanges Trim the excess seal strip so that it is flush with the economizer assembly flanges 1 Apply black seal strip provided in package to outside top edge of hood sides Wrap seal strip over edge to cover top flange 4 hood sides Make sure seal strip covers screw holes Allow strip to overhang past the end opposite the mounting flange See Fig 18 2 Assemble hood sides top and cross member with gas keted screws provided See Fig 19 Attach 10 green speed clips provided t
32. Number of Refrigerant Circuits 2 2 2 oz Ckt1 Ckt 2 115 ea 224 ea 304 224 REFRIGERANT TYPE R 22 Operating Charge Ib oz Circuit 1 34 0 35 0 41 0 Circuit 2 34 0 35 0 41 0 CONDENSER COIL Cross Hatched 3 Copper Tubes Aluminum Lanced or Copper Fins Quantity 2 2 1 Rows Fins in 3 15 3 15 4 15 3 15 Total Area sq ft 58 3 58 3 66 7 CONDENSER FAN Propeller Type Nominal 27 064 27 064 27 064 Quantity Diameter in 4 30 4 30 4 30 Motor Hp 1075 Rpm 1 1 1 EVAPORATOR COIL Cross Hatched Copper Tubes Aluminum or Copper Plate Fins Intertwined Circuits Rows Fins in 3 15 3 15 4 15 Total Area sq ft 34 7 34 7 34 7 EVAPORATOR FAN Centrifugal Type Quantity Size in 2 20x15 2 20x15 2 20 15 Type Drive Belt Belt Belt Nominal Cfm 14 000 16 000 18 000 Motor Hp 10 1511 20 15 2011 25 20 2511 30 Motor Frame Size S215T S254T S256T S254T S256T S284T S256T S284T S286T Motor Bearing Type Ball Ball Ball Maximum Allowable Rpm 1200 1200 1200 Motor Pulley Pitch Diameter 4 1 6 9 7 5 6 9 8 1 9 1 5 3 5 9 7 5 Nominal Motor Shaft Diameter in 198 198 158 158 1 1 1 1 1 Fan Pulley Pitch Diameter in 9 1 12 5 12 5 12 5 13 7 13 7 9 1 9 11 1 Nominal Fan Shaft Diameter in 11 6 116 1146 Belt Quantity Type 1 51 1 5VX630 1 5VX650 1 5VX630 1 5VX670 2 5VX680 1 5VX550 2 5VX560 2 5VX610 Belt Length in 54 63 65 63 67 68 55 56 59 Pulley Center Line Distance
33. but only through use of the Service Tool Comfort Works or Building Supervisor Software If single stage operation is desired adjust the economizer set points to identical values at the desired point to activate all exhaust fans The optional modulating power exhaust VAV standard CV optional is controlled by a modular electronic se quencer system This system consists of a model R353 sig nal input module and 4 model 5353 staging modules The signal input module receives 0 to 10 vdc signal from the building pressure transducer which is mounted adjacent to the supply static transducer behind the filter access panel The modules are mounted just below the unit control board The left module is the R353 and the 4 modules on the right 5353 modules for stages 1 through 4 On the unit wiring label the R353 is designated PESC and the 5353 modules are designated PES1 through PES4 The building pressure transducer range is 0 5 to 0 5 in wg It is powered by a to 10 vdc signal A factory installed hose at the connection leads to atmosphere and a field supplied hose must be connected to the Hi con nection and led into the building to a point where building pressure is to be controlled There is a plug button in the bulkhead just above the transducers for use in leading the hoses into the building via the return air ductwork There are 3 adjustments at the R353 module all of which have been factory set I
34. doors will open and close properly Remove plug button in panel to route tubing NOTES 1 Unless otherwise specified all dimensions are to outside of part 2 Dimensions are in inches Fig 31 Barometric Relief Damper and Power Exhaust Mounting Details Oo 9 lt k i Q SENSOR LOCATION 11 TUBES FROM BOTTOM VARIABLE FREQUENCY DRIVE INVERTER MODULATING POWER EXHAUST VAV INVERTER PRESSURE TRANSDUCER PRESSURE TRANSDUCER LOCATION INSIDE LOCATION INSIDE OF PANEL OF PANEL HEADER END VAV Variable Air Volume Fig 33A Motormaster Ill Sensor Location Fig 32 Pressure Transducer Locations Sizes 024 034 Step 10 Install Accessories After all the factory installed options have been adjusted install all field installed accessories Refer to the accessory installation in structions included with each accessory MOTORMASTER III SENSOR LOCATION Motor master III sensor locations are shown in Fig 33A 33C Re fer to the Motormaster III installation instructions for wiring and installation information 30 LOCATION 32 TUBES FROM BOTTOM LEFT HAND CONDENSER COIL VIEWED FROM ACCESS PANEL Fig 33B Motormaster Sensor Location Sizes 038 and 044 31 SENSOR LOCATION 81 TUBES FROM BOTTOM opp 5 52 dia dc oo TAS AA LEFT HAND
35. down arrow key to ad just the set point value to the value desired 6 Press the READ WRITE key again to enter the new value 7 Open the indoor fan circuit breaker 8 Replace the jumper between CC and ST on the terminal strip of the VFD 9 Close the indoor fan circuit breaker the VFD now is pow ered and the fan will operate NOTE Any field measurement of supply fan amps must be taken with an RMS meter between the fan circuit breaker and fan contactor upstream of VFD Table 7 VFD Set Point PRESSURE VFD in wg vdc SET POINT 0 00 12 0 0 25 144 0 50 16 8 0 75 19 2 1 00 216 125 240 1 50 264 178 288 200 312 2 25 33 6 2 50 6 0 36 0 2 75 6 4 38 4 3 00 68 40 8 325 432 3 50 456 VFD Variable Frequency Drive JUMPER JUMPERS NOTE Terminal strip is located inside the VFD Variable Frequency Drive at the bottom Fig 34 VFD Factory Installed Jumpers Power Exhaust The optional non modulating power exhaust CV only is a two stage design where the operation of the exhaust fans is linked to economizer position When the supply fan is running and the economizer is 25 open the base module closes contacts activating 2 exhaust fans When the economizer position reaches 7596 open the base module activates the other 2 exhaust fans The fans will turn off when the economizer closes below the same points The economizer position set points that trigger the exhaust fans can be modified
36. eel 520099021 DETAIL Eres prol Lee THERMOSTAT CONNECTION LOCATION SEE DETAIL Dual In Line Package PEC Power Exhaust Controller Fig 14 Control Box Diagram Sizes 024 034 DETAIL B SENSOR CONNECTION LOCATION DIP SWITCHES Le DETAIL A DETAIL A THERMOSTAT CONNECTION LOCATION Dual In Line Package PEC Power Exhaust Controller Fig 15 Control Box Diagram Sizes 038 048 24 NOTE On units running Version 1 0 of the unit control software the remote start stop switch is connected to R and 1 CONTROL THERMOSTAT BOX Fig 16 Field Control Thermostat Wiring T O18 NOTE Sensor part numbers as follows T55 51 001 T56 HH51BX004 T57 01215303 01 00000000 T10T11T12T13T14T15 T16 T55 T56 AND T57 TERMINAL BLOCK 0000 T3 T4 T5 T6 T7 T8 CONTROL BOARD BASE MODULE 1 Fig 17 Field Control Temperature Sensor Wiring Remote Field Control Units Running Version 2 0 of Unit Control Software A switch closure across terminals R and W1 on TB 3 will initiate the Occupied mode This can be done manually as well as through a field supplied timeclock Service Tool Building Supervisor and Comfort Works Access to the control board can be achieved through the ter minal marked CCN via a 3 wire bus IMPORTANT Default bus addre
37. ends together 13 Attach mounting angle without tabs to the assembled end of the filter track See Fig 25 14 Attach 6 green speed clips provided to mounting angles Engagement section of clip faces inside of rack FLANGE BLACK SEAL STRIP HOOD SIDE Fig 18 Adding Seal Strip to Top of Hood Sides FILTER COVER HOOD SIDE ECONOMIZER ACCESSORY ENTHALPY ENTHALPY BRACKET CONTROL FILTERS NY ANGLE SIDE CROSSMEMBER W O TABS FILTER TRACK BLOCKOFF ASSEMBLY BAFFLE WITH SCREWS NOTE Left side economizer hood has mounting angle without tabs and filter track assembled end on the opposite side Fig 19 Economizer Hood Assembly Right Side Economizer Hood Shown MOUNTING FLANGE HOOD SIDE Fig 20 Adding Seal Strip to Mounting Flange of Hood Sides 15 Attach remaining mounting angle with tabs to other end of the filter track with no 10 screws provided See Fig 26 16 Place filter track assembly in bottom of hood by placing tabbed end into slotted side with tab on bottom and attaching opposite end to hood with speed clips and gas keted screws provided Tabs can be hand bent after they have been inserted into the side NOTE The filter track assembly end with screws should face away from the other hood when mounted on the unit NOTE Tabs from both filter tracks will be in the same space After one filter track has been inserted into board bend the tabs
38. in 15 6 18 4 15 0 17 9 15 0 17 9 14 6 17 6 15 0 17 9 14 6 17 6 14 6 17 6 Factory Speed Setting rpm 788 966 1050 1066 1035 1162 1019 1135 1182 HIGH PRESSURE SWITCH psig Cutout 426 426 426 Reset Auto 320 320 320 LOW PRESSURE SWITCH psig Cutout 7 Reset Auto 22 RETURN AIR FILTERS Quantity Size in 10 20x24x2 10 20x24x2 10 20x24x2 OUTDOOR AIR FILTERS 8 16 25 8 16 25 8 16 25 Quantity Size in 4 20x25 4 20x25 4 20x25 POWER EXHAUST Direct Drive 3 Speed Single Phase Motor Factory Wired For High Speed and Forward Curved Fan Motor Quantity Hp EAT Fan Diameter Width in 10 LEGEND NOTES Z 1 See Table 2 for optional evaporator fan motor data Al Aluminum 2 Sizes 038 and 048 are 50EJ EW units only Cu Copper Weight of unit does not include variable frequency drive VFD barometric relief or power VFD VFD WEIGHTS Ib exhaust If a VAV unit a VFD is installed add the VFD weight in the table at right Hp 208 230 575 TEvaporator coil fin material condenser coil fin material 208230v 40 Y Sizes 024 034 Circuit 1 uses the lower portion of condenser coil Circuit 2 uses the upper 5 60 portion Sizes 038 048 Circuit 1 uses the left condenser coil Circuit 2 the right All units 7 64 ave intertwined evaporator coils 5 ttMotor and drive shown will deliver approximately 2 5 in wg net external static For more 10 64 drive information see Table 2 15 109 20 109 25 174 30 180
39. mastic in accordance with applicable codes Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier To attach ductwork to roof curb insert ductwork approxi mately 10 to 11 in up into the curb Connect ductwork to 14 gage roof curb material using sheet metal screw driven from inside the duct The units with electric heat require a 1 in clearance for the first 24 in of ductwork NOTE A 90 degree elbow must be provided in the duct work to comply with UL Underwriters Laboratories codes for use with electric heat Outlet grilles must not lie directly below unit discharge Step 4 Make Unit Duct Connections 50 UNITS Unit is shipped for through the bottom duct connections Ductwork openings are shown in Fig 3 and 4 Attach all ductwork to roof curb Air distribution is shown in Fig 8 Refer to installation instructions shipped with accessory roof curb for more information 50EW EY UNITS Remove shipping covers from supply and return air openings Attach field supplied ductwork to unit Use a single duct over both return openings and a single duct over both supply openings See Fig 5 and 6 for duct opening dimensions Secure all ducts to the building struc ture See Fig 9 Use flexible duct connectors between unit and ducts as required Install accessory barometric relief or power exhaust in the field fabricated return ductwork Refer to Position Power Exhaust Bar
40. power exhaust barometric relief damper and electric heat is negligible To alter fan per formance see Evaporator Fan Performance Adjustment sec tion on page 43 Condenser Fans and Motors Fans and motors are factory set Refer to Condenser Fan Adjustment section page 44 as required Return Air Filters Check that correct filters are in stalled in filter tracks See Table 1 Do not operate unit with out return air filters 35 Filter Replacement To replace filters open filter access door marked with label Remove inner access panel Remove plastic filter retainer in between filter tracks by slid ing and pulling outward Remove first filter by sliding it out of the opening in filter track Locate filter removal tool which is shipped next to the return air dampers Use the filter re moval tool to remove the remaining filters Outdoor Air Inlet Screens Outdoor air inlet screens must be in place before operating unit Economizer Adjustment Remove filter access panel Check that outdoor air damper is closed and return air damper 18 open Economizer operation and adjustment is described in Se quence of Operation and Make Outdoor Air Inlet Adjust ments sections this page and page 25 respectively Sequence of Operation NOTE Unit is shipped with default values that can be changed through Service Tool or CCN software COOLING CONSTANT VOLUME CV UNITS On power up the control module will ac
41. so they will not interfere with installation of the second hood 17 Attach black seal strip provided to filter cover Seal strip should be applied to the center of the large flange making sure to cover holes See Fig 27 18 Slide two 20 x 25 in filters into cross members of hood assembly Attach filter cover over filters with screws and speed clips provided 26 HOOD HOOD SIDE Fig 21 Adding Seal Strip to Hood Top Mounting Flange GRAY FOAM STRIP CROSS MEMBER HOOD SIDE SLOTTED Fig 23 Adding Foam Strip to Hood Side BLOCKOFF BAFFLE GRAY FOAM STRIP Fig 24 Adding Foam Strip to Blockoff Baffle MOUNTING ANGLE WITHOUT TABS FILTER TRACK ASSEMBLY Fig 25 Mounting Angle Without Tabs Attached to Filter Track Assembly MOUNTING ANGLE WITH TABS Fig 26 Mounting Angle With Tabs Attached to Filter Track Assembly 27 Minimum Damper Position Setting Setting of the out door air damper position is performed in conjunction with a shortened version of the field run test This is performed by first opening DIP Dual In Line Package switch no 6 then no 4 See Fig 17 and Table 7 The outdoor air damper closes The control allows 90 sec onds for the damper to close in case it is in the full open position Next the indoor fan contactor will energize The outdoor air damper will remain at 096 for 30 seconds It will then move to the 10 position for an
42. the CCN Carrier Comfort Network the following expansion board features can be utilized perform Demand Limit functions based on CCN loadshed commands or the state of the discrete input alarm monitoring of all key parameters CCN protocol provides power exhaust fire outputs for direct control of modulated power exhaust stages during fire or smoke modes smoke control modes including evacuation smoke purge pressurization and fire shutdown modulating power ex haust required provides CCN IAQ participation See Carrier TEMP or Variable Volume and Tem perature literature for complete TEMP single zone or VVT multi zone application information Features with Sensor Control of Unit Network Applica tions The base control board provides as standard a con nection for use with a Carrier VVT system and can also be integrated into a Carrier Comfort Network When the unit is accessed via a PC equipped with Com fort Works Building Supervisor or Service Tool the fol lowing features can be accessed on board timeclock can be programmed occupancy schedules can be programmed unit set points can be changed alarms can be monitored This access is available on the base control board via a RJ 11 phone jack or a 3 wire connection to the communi cation bus See Fig 12 The timeclock has a 10 hour minimum back up time to provide for unit power off for servicing unit 13 or during unexpected p
43. use reclaimed oil or oil that has been exposed to the atmosphere Refer to Carrier Stand ard Service Techniques Manual Chapter 1 Refriger ants section for procedures to add or remove oil FAN SHAFT BEARINGS Lubricate the bearings at least twice annually with suitable bearing grease Do not over grease Typical lubricants are show below MANUFACTURER LUBRICANT Texaco Regal AFB 2 Mobil Mobilplex EP No 1 Sunoco Prestige 42 Texaco Multifak 2 Preferred lubricant because it contains rust and oxidation inhibitors 43 CONDENSER AND EVAPORATOR FAN MOTOR BEAR INGS The condenser and evaporator fan motors have permanently sealed bearings so no field lubrication is necessary Evaporator Fan Performance Adjustment Fig 38 Fan motor pulleys are factory set for speed shown in Table 1 factory speed setting To change fan speeds change pulleys To align fan and motor pulleys 1 Shut off unit power supply 2 Loosen fan shaft pulley bushing 3 Slide fan pulley along fan shaft 4 Make angular alignment by loosening motor from mount ing plate 5 Retighten pulley IMPORTANT Check to ensure that the unit drive matches the duct static pressure in Tables 12 to 14 Evaporator Fan Service and Replacement Turn off unit power Remove supply air section panels Remove belt and blower pulley Loosen set screws in blower wheels Remove locking collars from bearings Remove shaft Re
44. vac T33 32 T34 35 Condenser Fan DO 115 vac T36 35 OFC2 DO 115 vac T37 38 Unloader 1 DO 115 vac T39 38 Unloader 2 DO 115 vac K1 Indoor Fan Relay DO HV K2 Compr 1 DO HV K3 Compr 2 DO HV Table 23 I O Channel Designations Expansion Module CV and VAV ASSIGNMENT T1 2 3 4 T5 6 T7 8 T9 10 T11 12 IAQ Indoor 2 10 vdc T13 14 IAQ Outdoor Al 2 10 vdc T15 16 17 25 Fan Status DI 24 vac T18 25 Filter Status DI 24 vac T19 25 Field Applied Status DI 24 vac T20 25 Demand Limit DI 24 vac T21 25 Fire Unit Shutdown DI 24 vac T22 25 Fire Pressurization DI 24 vac T23 25 Fire Evacuation DI 24 vac T24 25 Fire Smoke Purge DI 24 vac T26 27 T28 29 T30 29 Alarm Light Indicator DO 24 vac T31 32 Power Exhaust Fire 41 DO 115 vac T33 32 Power Exhaust Fire 42 DO 115 vac T34 35 Power Exhaust Fire 3 DO 115 vac T36 35 Power Exhaust Fire 44 DO 115 vac T37 38 T39 38 K1 2 LEGEND Analog Input DI Direct Input DO Direct Output IAQ Indoor Air Quality T Terminal 51 PACKAGED SERVICE TRAINING Our packaged service training programs provide an excellent way to increase your knowledge of the equipment discussed in this manual Product programs cover Unit Familiarization Maintenance Installatio
45. 00 304 6 296 6 350 300 150 1 1 281 0 273 0 300 300 150 2 1 304 6 296 6 350 300 150 150 150 150 150 150 150 175 048 508 423 223 288 173 4 150 150 175 150 2 175 43 3 150 43 3 175 86 6 175 86 6 175 125 125 34 6 125 34 6 125 69 3 125 69 3 125 125 150 575 518 632 346 164 267 120 4 125 125 150 125 150 34 6 125 34 6 150 69 3 125 69 3 150 1 Determine maximum deviation from average voltage FLA Full Load Amps AB 457 452 5v HACR Heating Air Conditioning and Refrigeration 464 457 7v FM Indoor Evaporator Fan Motor AC 457 455 2v Locked Rotor Amps i MCA Minimum Circuit Amps Maximum deviation is 7 v MOCP Maximum Overcurrent Protection Determine percent of voltage imbalance NEC National Electrical Code OFM Outdoor Condenser Fan Motor Voltage Imbalance 100 x RLA Rated Load Amps 457 Heater capacity KW is based on heater voltage of 208 v 240 v 480 v and 575 v 1 53 power distribution voltage to unit varies from rated heater voltage heater kW will vary accordingly TFuse or HACR circuit breaker NOTES 1 In compliance with NEC requirements for multimotor and combination load equip ment refer to NEC Articles 430 and 440 the overcurrent protective device for the unit shall be fuse or HACR breaker The Canadian units may be fuse or circuit breaker 2 Unbalanced 3 Phase Supply Voltage
46. 17 j j 2342 93 6 924 30 j 43 2808 924 33 26 59 LEGEND NOTE Extensive motor and electrical testing on the Carrier units has ensured BHP Brake Horsepower us the full horsepower range of the motor can be utilized with confidence sing your fan motors up to the horsepower ratings shown on the Motor Limi tations table will not result in nuisance tripping or premature motor failure Unit warranty will not be affected Table 17 User Defined Set Points SET POINT DEFAULT OHSP 68 OCSP 78 UHSP 55 UCSP 90 SASP 55 OATL 65 NTLO 50 RTIO 3 LMT 10 MDP 20 IAQS 650 UHDB i UCDB Unoccupied Cooling Deadband 01010 1 XX XF High Temp Min Position 0 to 100 35 PES1 XX XF CV Power Exhaust Stage 1 Point 0 to 100 25 52 75 LEGEND CV Constant Volume IAQ Indoor Air Quality OAT Outdoor Air Temperature 95 9 The control module will operate economizer run diag nostics to monitor alarms alerts at all times and respond to CCN communications to perform any configured network POC product outboard control functions such as time outdoor air temperature broadcast and global occupancy broad cast When the optional expansion I O board is employed it will perform a periodic scan and maintain a database of ex panded I O points perform Fire Smoke control power ex haust required if in Occupied mode perform IAQ control
47. 209 9 230 2 129 4 126 6 153 0 150 2 132 3 143 3 161 8 172 8 188 6 208 2 218 1 237 7 144 8 140 6 168 4 164 2 151 6 160 8 181 1 190 3 MOCPt 150 150 175 175 150 150 175 175 200 225 225 250 150 150 175 175 150 150 175 175 200 225 225 250 175 175 200 200 175 175 200 200 207 9 225 7 237 4 255 2 250 250 275 275 21 11 100 100 100 110 Table 4 Electrical Data 50EJ EK EW EY024 048 cont NOMINAL VOLTAGE COMPRESSOR Eu UNIT SIZE POWER ELECTRIC EXHAUST HEAT POWER SUPPLY LRA LEGEND 508 32 57 1 25 6 0 5 9 1 1 19 9 1 16 0 1 2 4 Full Load es Heating Air Conditioning and Refrigeration Indoor Evaporator Fan Motor Locked Rotor Amps Minimum Circuit Amps Maximum Overcurrent Protection National Electrical Code Outdoor Condenser Fan Motor Rated Load Amps Heater capacity KW is based on heater voltage of 208 v 240 v 480 v and 575 v If power distribution voltage to unit varies from rated heater voltage heater kW will vary accordingly TFuse or HACR circuit breaker NOTES 1 In compliance with NEC requirements for multimotor and combination load equip ment refer to NEC Articles 430 and 440 the overcurrent protective device for the unit shall be fuse or HACR breaker The Canadian units may be fuse or circuit breaker 2 Unbalanced 3 Phase Supply Voltage Never operate a motor
48. 50 250 225 225 250 250 225 225 250 250 250 250 275 275 250 250 275 250 250 250 275 250 224 4 240 7 253 9 270 2 275 275 300 300 100 110 100 110 110 125 100 110 100 110 125 150 110 125 110 125 125 150 80 90 70 90 90 100 80 100 80 100 100 110 90 100 90 100 110 125 Table 4 Electrical Data 50EJ EK EW EY024 048 cont VOLTAGE COMPRESSOR NOMINAL UNIT VOLTAGE SIZE OFM POWER EXHAUST ELECTRIC HEAT POWER SUPPLY 3 Ph 60 Hz LEGEND 508 32 57 1 25 6 0 5 57 1 25 6 0 5 Full Load es Heating Air Conditioning and Refrigeration Indoor Evaporator Fan Motor Locked Rotor Amps Minimum Circuit Amps Maximum Overcurrent Protection National Electrical Code No 1 No 2 RLA RLA LRA Qty Hp Outdoor Condenser Fan Motor Rated Load Amps Heater capacity KW is based on heater voltage of 208 v 240 v 480 v and 575 v If power distribution voltage to unit varies from rated heater voltage heater kW will vary accordingly TFuse or HACR circuit breaker NOTES 1 In compliance with NEC requirements for multimotor and combination load equip ment refer to NEC Articles 430 and 440 the overcurrent protective device for the unit shall be fuse or HACR breaker The Canadian units may be fuse or circuit breaker 2 Unbalanced 3 Phase Supply Voltage
49. 50EJ EK EW EY024 048 Single Package Rooftop Units Electric Cooling with Electric Heat Option A Installation Start Up and CONTENTS Page SAFETY CONSIDERATIONS 1 INSTALLATION 1 31 Step 1 Provide Unit Support 1 ROOF CURB ALTERNATE UNIT SUPPORT Step 2 Rig and Place Unit 8 POSITIONING ROOF MOUNT Step 3 Field Fabricate Ductwork 11 Step 4 Make Unit Duct Connections 11 Step 5 Trap Condensate Drain 11 Step 6 Controls Options 12 CONSTANT VOLUME APPLICATIONS VARIABLE AIR VOLUME VAV APPLICATIONS Step 7 Make Electrical Connections 15 POWER WIRING FIELD POWER SUPPLY FIELD CONTROL WIRING Step 8 Make Outdoor Air Inlet Adjustments 25 ECONOMIZER ECONOMIZER SETTINGS Step 9 Position Power Exhaust Barometric Relief Damper Hood 29 Step 10 Install Accessories 30 START UP es 32 42 SERVICE 42 45 TROUBLESHOOTING 46 51 START UP CHECKLIST CL 1 CL2 SAFETY CONSIDERATIONS Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical com ponents Only trained and qualified service personnel should install repair or service air conditionin
50. 72 8 80 72 69 3 90 12 6 23 6 72 69 3 100 60 12 6 23 6 80 36 34 6 64 6 70 12 6 23 6 36 34 6 80 3 90 72 69 3 90 5 100 12 6 23 6 72 69 3 106 3 110 Determine maximum deviation from average voltage AB 457 452 5v 464 457 7 v 457 455 2v Maximum deviation is 7 v Determine percent of voltage imbalance Voltage Imbalance 100 x 457 1 53 This amount of phase imbalance is satisfactory as it is below the maximum allowable 2 IMPORTANT If the supply voltage phase imbalance is more than 296 contact your local electric utility company immediately 3 MCA calculation for units with electric heaters over 50 kW 1 25 x IFM amps 1 00 x heater FLA 15 90 15 907 UNIT SIZE 028 Table 4 Electrical Data 50EJ EK EW EY024 048 cont NOMINAL VOLTAGE IFM POWER ELECTRIC EXHAUST HEAT POWER SUPPLY 3 Ph 60 Hz 18 Hp FLA 24 2 22 0 30 8 kW FLA 461 m 29 36 23 6 41 6 29 36 59 72 23 6 41 6 59 72 75 1 86 75 1 86 150 1 1 150 1 1 WW oo OO NN oo ms aro 59 72 3 6 41 6 59 72 75 1 86 75 1 86 150 1 1 150 1 1 MM NN Oo 29 36 23 6 41 6 29 36 are 122 8 120 6 146 4 144 2 124 1 135 8 153 6 165 3 180 4 200 7
51. END Dual In Line Package LED Light Emitting Diode Variable Air Volume the unit is a VAV unit If NOT a VAV unit set DIP switch position 1 to the closed position and reset power Then check for wiring errors Finally replace sensor Communications between the expansion board and the control board have been interrupted Ensure that an expansion board is installed and wired using the wire harness supplied with the expansion module If an expansion board is not used ensure that DIP switch position 3 is in the closed position and reset power Generated when hardware has failed on control board Replace the control board Generated when hardware has failed on the expansion board Replace the expansion board 49 Tables 21 23 show the input and output channel designations Table 21 Channel Designations Base Module CV TERMINAL NO ASSIGNMENT T1 2 SPT 10 Thermistor 3 4 STO 10 Thermistor 5 6 OAT 5 Thermistor 7 8 SAT 5 Thermistor T9 10 T11 12 SAT Reset 2 10 vdc T13 14 715 16 T17 25 Y1 or Remote Start Stop DI 24 vac T18 25 Y2 DI 24 vac T19 25 W1 DI 24 vac T20 25 W2 DI 24 vac T21 25 G DI 24 vac T22 25 Compressor 1 Safety DI 24 vac T23 25 Compressor 2 Safety DI 24 vac T24 25 Outside Air Enthalpy DI 24 vac T26 27 Economizer Pos AO 4 20 mA T28 29 Heat 1 Rel
52. EXHAUST AIR 0 1 25 DRAIN CONN ECONO AIR 23 21 32 601 32 23 32 150 B 831 3810 POWER EXHAUST OR BAROMETRIC RELIEF RETURN AIR SUPPLY AIR 49 17 32 a 12581 54111 2235 FRAME 0 1 3 8 35JDIA HOLE IN LIFTING LUG 91 1 2 12324 LIFTING POSITION 94 OVERALL LIFTING L 123881 NOTES 1 Weights include economizer Std LEGEND 2 e Center of gravity VFD Variable Frequency Drive 3 Do notlocate adjacent units with discharge facing economizer inlet Mini mum clearances to be Adjacent Units 15 0 Top of Units No overhang Condenser Coil 4 0 Economizer Side 6 0 Filter Access Side 10 0 for removal of evaporator coil 4 For smaller service and operational clearances contact Carrier Applica tion Engineering department 5 Bottom ducts designed to be attached to accessory roof curb If unit is mounted on dunnage it is recommended the ducts be supported by cross braces as done on accessory roof curb 6 Dimensions in inches Dimensions in are in millimeters 7 For units with electric heat a field supplied 90 elbow must be installed in the supply ductwork below the unit discharge UNIT SIZE OPERATING TA Ib ftin ftin 1368 Fig 4 Base Unit Dimensions 50EJ038 048 and 50 044 1302 1409 1505 J K044 19 12 y NS 50 2661 55 0008 HINGED
53. MUM COOLING MINIMUM COOLING MAXIMUM 50EJ EK EW EY CFM CFM VAV CFM CV CFM 024 10 000 028 12 500 030 13 750 034 15 000 038 17 500 044 20 000 048 22 500 LEGEND CV Constant Volume Variable Air Volume 38 Table 16 Motor Limitations STANDARD EFFICIENCY MOTORS Hp Bhp 208 430 40 55 Efficiency 89 68 823 gt 7 529 84 0 87 841 95 j j 3 96 8599 823 m o 255 889 857 24 85 6 ea 3 834 18 0 24 00 18 00 15 891 84 5 23 4 29 25 22 82 19 950 87 5 j j 30 286 24 871 9250 2938 904 3 9 n 2936 883 HIGH EFFICIENCY MOTORS Nominal Motor Hp Bp 2 29 40 5 Efficiency 66 5 87 5 5 89 j 6 j 500 87 5 m 5 4988 895 738 885 75 808 885 9 J 917 285 248 880 895 10 8 1 j 98 89 5 m 960 910 15 3 45 08 39 17 12 543 91 0 X480 Z Tr me 9 93 0 224 6384 55 gt f 97 0 20 2 j 2892 910 37 936 705 917 25 24 j 3 2398 9
54. NE SERVICE VALVES ON EACH CIRCUIT ARE OPEN START UP ELECTRICAL SUPPLY VOLTAGE 11 12 L2 L3 13 11 COMPRESSOR AMPS COMPRESSOR NO 1 L1 L2 L3 COMPRESSOR NO 2 L1 L2 L3 SUPPLY FAN AMPS CV EXHAUST FAN AMPS VAV fan supply amps reading must be taken with a true RMS meter for accurate readings ELECTRIC HEAT AMPS IF SO EQUIPPED Ll L2 L3 TEMPERATURES OUTDOOR AIR TEMPERATURE DB Dry Bulb RETURN AIR TEMPERATURE F DB WB Wet Bulb COOLING SUPPLY AIR F ELECTRIC HEAT SUPPLY AIR IF SO EQUIPPED F PRESSURES REFRIGERANT SUCTION CIRCUIT NO 1 PSIG CIRCUIT NO 2 PSIG REFRIGERANT DISCHARGE CIRCUIT NO 1 PSIG CIRCUIT NO 2 PSIG VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGE 45 CL 1 START UP CHECKLIST cont GENERAL ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS ENSURE DRIVES OPERATE WITHIN LIMITS OF FAN PERFORMANCE TABLES HIGH PRESSURE SWITCH SETTING PSIG LOW PRESSURE SWITCH SETTING PSIG MOTOR PULLEY PART NUMBER FAN PULLEY PART NUMBER BELT PART NUMBER BELT SIZE in FILTER QUANTITY FILTER SIZES in ADDITIONAL NOTES Copyright 1996 Carrier Corporation Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 PC 111 Catalog No 535 006 Printed in U S A Form 50E 3SI
55. P switch no 3 and determines if the unit will use expansion mode operation Power up takes a random time of 1 to 63 seconds plus 5 minutes the first time power is sent to the control board after a power outage The control module will determine if an interface link age is active and if the unit will operate in a Digital Air Volume DAV mode In a DAV system the room terminals are equipped with microprocessor controls that give 40 commands to the base unit module If a linkage is active the control module will replace local comfort set points space and return air temperatures and occupancy status with the linkage data supplied The control module will determine occupancy status from Time Schedules if programmed Remote Occupied Unoccupied input global occupancy schedules or DAV If temperature compensated start is active the unit will be con trolled as in the Occupied mode NOTE The temperature compensated start 15 a period of time calculated to bring the unit on while in Unoccupied mode to reach the occupied set point when occupancy occurs The control module will set the appropriate operating mode and fan control The control module will turn on the VFD if Occupied mode is evident If in Unoccupied mode and a valid space temperature reading is available either from a sensor or DAV the control module will monitor SPT space tem perature against unoccupied heat and cool set points The control module will start the
56. Pg CL 2 8 96 Replaces 50E 1SI Tab 16 CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE 727
57. S 81 25 DETAIL Z SCALE 1 8 GASKET SUPPLIED WITH CURB SEE DETAIL 7 COUNTER FLASHING FIELD SUPPLIED ROOF ING FELT FIELD SUPPLIED CANT STRIP FIELD SUPPLIED ROOF ING MATERIA 5 COLD rr CONDENSER AND COMPRESSOR END CONDENSER AND COMPRESSOR 4 END NOTE To prevent standing water in the drain pan of the indoor section and the heat exchangers UNIT CAN ONLY BE PITCHED AS SHOWN RIGID INSULATION FIELD SUPPLIED NOTES 1 Unless otherwise specified all dimensions are to out UNIT LEVELING TOLERANCES DIMENSIONS side of part Roof curb accessory is shipped disassembled Degrees and Inches All roof curb parts are to be 16 ga galvanized steel Dimensions are in inches From edge of unit to horizontal Fig 2 Roof Curb Sizes 038 048 3 108 1 8 e 2746 RETURN 2 9 16 10 1 2 501851 50 266 112101 112101 A eS COMPRESSOR ACCESS DOOR HINGED 3 T 24 6101 RETURN RETURN 88 1 4 ps ESSE ICSE SEED 15 21 32 2241 TOP cover 13981 1610 SUPPLY 2 5 1 2 140 INSIDE BASE RAIL 2 CONTROL BOX 15 13 16 14011 8861 3 1 2 89 FIELD POWER 3 4 19 LOW VOLTAGE 41 25 32 60 1 16 110611 1526 SUPPLY ONTROL BOX ACCESS DOOR
58. ages can then be set as desired between 5096 and 75 The default offset set points for modulating power ex haust are shown in Table 9 Table 9 Power Exhaust Default Set Points OFF OFF ON STATIC VOLTAGE VOLTAGE PRESSURE in wg 60 63 DIFFE STAGE OFFSET nENTIAL 1 0 00 2 sm 3 65 68 0 3 0 12 4 018 The differential set point is the difference between the turn off point and the turn on point for each module It also is calibrated in terms of percent of input signal and has a range of 1 to 7 The differential potentiometer is cali brated in 1 increments and is factory set at approximately 3 It is recommended to leave the set point at 3 to mini mize cycling of the fans The offset and differential potentioments have been fac tory set for atmosphereic pressure Do not change these set tings until there is some experience with the building In most cases the factory settings will be satisfactory However if the building pressure is not being maintained as desired then some minor adjusting on a trial and error basis can be made Direct Digital Controls DIP Switch Configura tion The Direct Digital Control DDC board must be configured for each application The DDC board is config ured through the DIP switches located on the board There are 8 DIP switches which configure 8 different applications of the DDC See Tables 10A and 10B DIP switch 1 is on the left of the block DIP swi
59. allowing the coil to clear Once the frost has melted the compressor can be reenergized CIRCUIT 1 ALL OUTDOOR FANS MUST BE OPERATING 140 120 ADD CHARGE IF ABOVE CURVE 100 80 E REDUCE CHARGE IF BELOW CURVE 50 100 150 200 250 300 350 400 LIQUID PRESSURE AT LIQUID VALVE PSIG VALVE DEG F LIQUID TEMPERATURE AT 110 CIRCUIT 2 ALL OUTDOOR FANS MUST BE OPERATING 140 11 120 1 ADD CHARGE IF ABOVE CURVE 1 H 80 Jit REDUCE CHARGE BELOW CURVE 40 50 100 150 200 250 300 350 400 LIQUID PRESSURE LIQUI Fig 41 Cooling Charging Chart Sizes 024 034 LIQUID TEMPERATURE AT LIQUID VALVE DEG VALVE PSIG 45 Relief Devices All units have relief devices to pro tect against damage from excessive pressures i e fire These devices are installed on the suction line liquid line and on the compressor Control Circuit 24 V This control circuit is pro tected against overcurrent by a 3 2 amp circuit breaker 4 Breaker can be reset If it trips determine cause of trouble before resetting Control Circuit
60. ampers will be in the minimum position In the Unoccupied mode the indoor fan motor will be off but will energize upon the call for heat The outdoor air dampers will move to the IAQ unoccupied position generally set to zero in the Unoccupied mode The IAQ feature is enabled through system software The duct pressure sensor will signal to the variable frequency drive to operate at full speed Upon a call for additional heat if the unit is equipped with a two stage heater the second stage of heat will be energized When the call for heat is satisfied the heaters will deenergize NOTE The HIR is not needed in a DAV system If the unit is in the Unoccupied mode the indoor fan mo tor will deenergize and the outdoor air damper will move to the closed position if open MORNING WARM UP VAV ONLY WITH PC ACCESSED CCN OPERATION Morning warm up occurs when the control module has been programmed to turn on heat prior to the Occupied mode to be ready for the occupancy Morn ing warm up is a condition in VAV systems that occurs when the Temperature Compensated Start algorithm calculates a biased occupied start time and the unit has a demand for heat ing The warm up will continue into the occupied period as long as there is a need for heat During warm up the unit can continue heating into the occupied period even if oc cupied heating is disabled When the heating demand is sat isfied the warm up condition will terminate To inc
61. and monitor the fan filter demand limit and field applied status with accessories If thermostats are used to energize the G input the control module will turn on the indoor fan without delay and open the economizer dampers to minimum position If thermo stats are used to deenergize the G input the control module will turn off the indoor fan without delay and close the econo mizer dampers When cooling G must be energized before cooling can operate The control module determines if outdoor condi tions are suitable for economizer cooling using the standard outdoor air thermistor For the economizer to function for outside air cooling the enthalpy must be below the enthalpy set point the outdoor air temperature must be equal to or less than the High Outdoor Air Temperature Lockout de fault is 65 F the SAT supply air temperature thermistor must not be in alarm and the outdoor air reading is avail able When these conditions are satisfied the control mod ule will use economizer as the first stage of cooling When YI input is energized the economizer will be modu lated to maintain SAT at the defined set point The default is 55 When SAT is above the set point the economizer will be 10096 open When SAT is below the set point the economizer will modulate between minimum and 100 open position When Y2 is energized the control module will turn on compressor 1 and continue to modulate the economizer as described above
62. ate pans are sloped so that water will completely drain from the condensate pan to comply with indoor air qual ity guidelines Fig 10 Condensate Drain Connections Typical Roof Curb or Slab Mount Shown Step 6 Controls Options The control options that the units can provide are based on the following param eters CV constant volume or VAV variable air volume operation stand alone unit with field supplied sensors in stalled CV or VAV as a system via the Carrier Comfort System TEMP or VVT optional electronic expansion board installed CV or VAV linked to the Carrier Comfort Net work and availability of a computer and software Comfort Works Building Supervisor and Service Tool to access the base control board See Table 3 NOTE Access to the base control board allows unit occu pancy schedules unit timeclock and various set points to be changed from their factory defined default settings CONSTANT VOLUME APPLICATIONS The standard CV unit is capable of being operated with either a Carrier approved thermostat or a field supplied sensor See Price Pages for ordering information Features with Thermostat Control of Unit two stage heating if installed two stage cooling control of unit using Y1 Y2 W1 W2 and G thermostat inputs control of the indoor fan outdoor air temperature supply air temperature monitoring control of an outdoor air condenser fan ba
63. ations or designs without notice and without incurring obligations Catalog No 535 006 Book 1 PC 111 Tab 1b Printed in U S A Form 50 3 1 Pg 1 8 96 Replaces 50E 1SI 81 25 ES 1 15 38 15 60 00 114 62 162 44 1 75 1 25 T 14 00 DETAIL 7 SCALE 1 8 TYP 4 CORNERS 1 97 3 00 3 00 RAIL CROSS SECTION ROOF CURB CROSS SECTION TYP 2 SIDES WE 4 SIDES 14 GAGE SEE DETAIL SCALE 1 16 GASKET SUPPLIED WITH CURB NAIL COUNTER FLASHING FIELD SUPPLIED CONDENSER AND CONDENSER COMPRESSOR END AND ROOF ING FELT FIELD SUPPLIED COMPRESSOR CANT STRIP FIELD SUPPLIED ROOF ING MATERIAL FIELD SUPPLIED b Ses lt NOTE To prevent standing water in the drain pan of the indoor section and the heat exchangers UNIT CAN ONLY BE PITCHED AS SHOWN RIGID INSULATION FIELD SUPPLIED UNIT LEVELING TOLERANCES DIMENSIONS NOTES Degrees and Inches 1 Unless otherwise specified all dimensions are to out side of part Roof curb accessory is shipped disassembled 2 3 All roof curb parts are to be 16 ga galvanized steel 4 Dimensions are in inches From edge of unit to horizontal Fig 1 Roof Curb Sizes 024 034 2 s 1 15 2 83 L 5 28 14 00 L 8 1 97 2 39 3 00 BASE RAIL CROSS SECTION ROOF CURB CROSS SECTION TYP 2 SIDES TYP 4 SIDE
64. ay DO 24 vac 30 29 Heat 2 Relay DO 24 vac CV Power Exhaust 1 Modulating Pwr Exht DO 131522 115 33 32 CV Power Exhaust 2 DO 115 vac T34 35 Condenser Fan DO 115 vac T36 35 OFC2 DO 115 vac T37 38 T39 38 K1 Indoor Fan Relay DO HV K2 Compr 1 DO HV K3 Compr 2 DO HV LEGEND Tables 21 and 22 Analog Input AO Analog Output CCN Carrier Comfort Network CV Constant Volume DI Direct Input DO Direct Output HV High Voltage KO Kilo Ohms OAT Outdoor Air Temperature OFC Outdoor Fan Contactor RAT Return Air Temperature SAT Supply Air Temperature SPT Space Temperature STO Space Temperature Offset T Terminal VAV Variable Air Volume 50 Table 22 I O Channel Designations Base Module VAV TERMINAL NO ASSIGNMENT T1 2 SPT CCN 10 Thermistor 3 4 RAT 5 Thermistor T5 6 OAT 5 Thermistor T7 8 SAT 5 Thermistor T9 10 T11 12 SAT Reset AI 2 10 vdc T13 14 T15 16 T17 25 Remote Start Stop DI 24 vac T18 25 T19 25 T20 25 T21 25 22 25 Compressor 1 Safety 24 vac T23 25 Compressor 2 Safety DI 24 vac T24 25 Outside Air Enthalpy DI 24 vac T26 27 Economizer Pos AO 4 20 mA T28 29 Heat 1 Relay DO 115 vac 30 29 Heat Interlock Relay DO 115 vac 31 32 Modulated Power Exhaust DO 115
65. both return and both supply openings 3 1 2 89 NPT FIELD POWER 3 4 19 LOW VOLTAGE ACCESS DOOR HINGED 7 8 22 DIA LOW VOLTAGE 22 11132 512 de 11 11 32 x 132 82 A INSIDE BASE RAILS 13 3 16 6 13 118 zu T 1352 m 12 578 91 25 32 1321 3 2484 view ECONOMI ZER HOODS Is HOODS FIELD INSTALLED 140827 ONTROL BOX INCLUDED WITH UNIT ONDENSER COIL LEGEND VFD Variable Frequency Drive OPERATING UNIT SIZE WEIGHT 50EW EY Ib 1080 CORNER WEIGHT Ib 4102 5 812 3 7 844 859 1210 4102 5 812 3 7 844 859 1210 1210 Fig 5 Base Unit Dimensions 50EW EY024 034 88 1 4 2241 COVERS 50 12701 2 9 16 65 ST EE SER i La 13 1 8 13521 134 15 32 L34451 Ed 0 3 4 19 NPT LOW VOLTAGE 4 bu 0 3 1 2 89 NPT FIELD POWER HOODS FIELD INSTALLED INCLUDED WITH UNIT HEAT SECTION 2 REQ D ACCESS PANEL ONDENSER COIL FILTER ACCESS DOOR HINGED INDOOR BLOWER BOTH SIDES INDOOR MOTOR ACCESS DOOR HINGED 0 1 25 NPT ECONO AIR DRAIN CONN RETURN AIR gt 23 21 32 SUPPLY AIR 601 49 11 32 12581 BASE FRAME 88 2235 9171 7 LIFTING POSITION 23241 0 1 3 8 35 DIA IN LIFTING LUG
66. cupied override capability 1 hour and provide a tem perature offset of 5 F Standard features are support of remote occupied unoccupied input to start and stop the unit cooling capacity control of 3 stages using economizer and 2 compressors to maintain space temperature to an occu pied or unoccupied set point enable heating if installed or cooling during unoccupied periods as required to maintain space temperature within the unoccupied set points adjustment of space temperature set points of 5 F when using a T 56 sensor Table 3 Controls Options and Configurations Non Thermostat Applications UNIT CONFIGURATION UNITS RUNNING VERSION 1 0 UNIT CONTROL SOFTWARE DEFAULT COOLING DEFAULT HEATING wi Unoccupied Cooling 90 F SPT Unoccupied Heating 55 F SPT CV or VAV Unit with SPT Sensor Occupied Cooling NA Occupied Heating NA CV Unit with SPT Sensor and Remote Unoccupied Cooling 90 SPT Unoccupied Heating 55 F SPT Start Stop Switch Occupied Cooling 78 F SPT Occupied Heating 68 F SPT Unoccupied Cooling NA Unoccupied Heating NA VAV Unit Remote Start Switch Only Occupied Cooling 55 F SAT Occupied Heating NA VAV Unit with SPT Sensor and Remote Unoccupied Cooling 90 SPT Unoccupied Heating 55 F SPT Start Stop Switch Occupied Cooling 55 SAT Occupied Heating NA UNITS RUNNING VERSION 2 0 UNIT CONTROL SOFTWARE ENS Unoccupied Cooling
67. e TIME GUARD CIRCUIT The Time Guard function built into the rooftop s control module board maintains a mini mum off time of 5 minutes and a minimum on time of 10 seconds CRANKCASE HEATER The unit main power supply must remain on to provide crankcase heater operation The crank case heater in each compressor keeps oil free of refrigerant while compressor is off HEAD PRESSURE CONTROL Each unit has a fan cy cling outdoor thermostat to shut off outdoor fan motor s at 55 F one outdoor fan motor on 024 034 units and 2 outdoor fan motors on 038 048 units The head pressure control per mits the unit to operate with correct condensing temperatures down to 35 F outdoor air temperature Compressor 2 42 MOTORMASTER III DEVICE The Motormaster III Solid State Head Pressure Control is a field installed acces sory fan speed control device actuated by a temperature sen sor The Motormaster device is specifically designed for use on Carrier equipment and controls the outdoor fan mo tor speed in response to the saturated condensing tempera ture For outdoor temperatures down to 20 F the Motor master device maintains condensing temperature at 100 SERVICE WARNING Before performing service or maintenance operations on unit turn off main power switch to unit Turn off ac cessory heater power switch if applicable Electrical shock could cause personal injury Service Access All
68. e CCN communi cation bus to a system element use a color coding sys tem for the entire network to simplify installation and checkout See Table 6 Table 6 Color Code Recommendations TYPE INSULATION COLOR PIN NO Positive RD I Ground WHITE 2 NOTE If a cable with a different color scheme is selected a similar color code should be adopted for the entire network At each system element the shields of the communica tion bus cables must be tied together If the communication bus is entirely within one building the resulting continuous shield must be connected to a ground at one point only If the communication bus cable exits from one building and enters another the shields must be connected to grounds at the lightning suppressor in each building where the cable enters or exits the building one point per building only connect the unit to the network 1 Turn off power to the control box 2 Cut the CCN wire and strip the ends of the red white ground and black conductors If a different network color scheme is used substitute appropriate colors 3 Remove the 3 pin male plug from the base module in the main control box and connect the wires as follows a Insert and secure the red wire to terminal 1 of the 3 pin plug b Insert and secure the white ground wire to ter minal 2 of the 3 pin plug c Insert and secure the black wire to terminal 3 of the 3 pin plug 4
69. et Note that charging chart is different from those normally used An accurate pressure gage and temperature sensing device are required Measure liquid line pressure at the liquid line serv ice valve using pressure gage Connect temperature sensing device to liquid line near the liquid line service valve and insulate it so that outdoor ambient temperature does not af fect reading Indoor air cfm must be within normal operat ing range of unit Take outdoor ambient temperature and read the suction pressure gage Refer to appropriate chart to de termine correct suction temperature If intersection point on chart is above the curve add refrigerant If intersection point on chart is below curve carefully recover some of the charge Recheck suction pressure as charge is adjusted Filter Drier Replace whenever refrigerant system is exposed to atmosphere Thermostatic Expansion Valve TXV Each cir cuit has one It is nonadjustable and is factory set to main tain 10 to 13 F superheat leaving the evaporator coil Con trols flow of liquid refrigerant to the evaporator coils Protective Devices COMPRESSOR PROTECTION Overcurrent Each compressor has one manual reset cali brated trip magnetic circuit breaker Do not bypass connec tions or increase the size of the circuit breaker to correct trouble Determine the cause and correct it before resetting the breaker Overtemperature Each 06D type compressor 024 038 units on
70. g equipment Untrained personnel can perform basic maintenance func tions of cleaning coils and filters and replacing filters other operations should be performed by trained service per sonnel When working on air conditioning equipment ob serve precautions in the literature tags and labels attached to the unit and other safety precautions that may apply Follow all safety codes Wear safety glasses and work gloves Use quenching cloth for unbrazing operations Have fire ex tinguishers available for all brazing operations WARNING Before performing service or maintenance operations on unit turn off main power switch to unit Electrical shock could cause personal injury Service Instructions IMPORTANT READ BEFORE INSTALLING IMPORTANT Due to upgrades in unit control soft ware and hardware units produced currently are slightly different than original design units The unit control software which has changed is designated with a sticker on the unit control board chip 08 the large chip in the center of the board which states the software Ver sion number Version 1 0 is the original version Ver sion 2 0 is the current version Differences in instal lation configuration and start up procedures in this manual will be identified by Version number INSTALLATION Step 1 Provide Unit Support A CAUTION All panels must be in place when rigging Unit is not designed for handling by fork truck
71. g properly The high or low pressure safety switch for compressor no 1 has opened for 3 seconds The error will be cleared and compressor no 1 will be allowed to turn on in 15 minutes If the safeties have been tripped 3 times in 90 minutes compressor no 1 will be locked out until the control board has been manually reset 3 HF 14 Compressor 2 Safety The high or low pressure safety switch for compressor no 2 has opened for 3 seconds The error will be cleared and compressor no 2 will be allowed to turn on in 15 minutes If the safeties have been tripped 3 times in 90 minutes compressor no 2 will be locked out until the control board has been manually reset 4 Thermostat Failure The thermostat is calling for both heating and cooling at the same time The unit will operate on a first call basis and will auto matically reset 5 SAT Thermistor Failure The supply air temperature SAT sensor has failed First check for wiring errors then replace sensor 6 OAT Thermistor Failure The outside air temperature OAT sensor has failed First check for wiring errors then replace sensor 7 Space Temp Sen Failure The space temperature sensor has failed First check for wiring errors then replace sensor 8 RAT Thermistor Failure The return air temperature RAT sensor has failed Ensure that Loss of Communications with Expansion board 9 SE 05 10 HF 16 Control Board Failure 11 HF 17 Expansion Board Failure LEG
72. he outdoor air damper will move to the minimum po sition Upon a call for additional heat if the unit is equipped with a two stage heater the second stage of heat is ener gized When the call for heat is satisfied the heaters will deenergize The indoor fan motor will also deenergize un less controlled by a room sensor and the outdoor air damper will move to the closed position If the unit is controlled with a room sensor the fan will not run in the unoccupied mode Upon a call for heat the first stage of heat is energized the indoor fan motor will turn on and the outdoor air damper will move to the Unoccupied IAQ position generally set to zero in the unoccupied mode The IAQ feature is enabled through system software Upon a call for additional heat if the unit is equipped with a two stage heater the second stage of heat is energized When the call for heat is satisfied the heaters and indoor fan motor will deenergize and the outdoor air damper will move to the closed position if open HEATING VARIABLE AIR VOLUME VAV UNITS The control board is powered by 24 vac When there is a call for heating from Morning Warm Up Unoccupied or Oc cupied modes power is sent from the control module to energize the first stage of electric heat A field supplied heat interlock relay signals for the air terminals to fully open See Fig 35 In the Occupied mode the indoor fan motor will operate continuously and the outdoor air d
73. icular application To set the duct static pressure perform the following steps The factory setting is zero The duct transducer has a range from 0 to 5 in wg The transducer output is 2 to 10 vdc therefore 0 to 5 in wg is proportional to the 2 to 10 vdc and must be expressed to the VFD in terms of percentage of the frequency range To do this refer to Table 7 The set point value is a percentage of the maximum output frequency Lo cate the duct static pressure closest to that desired and use the corresponding set point value If necessary interpolation between duct static pressures is permissible To set the VFD the VFD must be powered up however since it is located near the indoor air fan operation of the fan is not desirable To disable the fan perform the follow ing procedure 1 Open the indoor fan circuit breaker 2 Remove the jumper between CC and ST on the terminal strip of the VFD see Fig 34 DP RED DP BLUE FROM DUCT PRESSURE TRANSDUCER 3 Close the indoor fan circuit breaker The VFD now is pow ered but the fan will not operate 4 On the front of the VFD is a keypad and display which will be used to enter the set point To access this field press SETUP key then press the SETUP key 6 times to scroll to the sixth parameter which will display Srl This is the VFD set point listed in Table 7 5 Press the READ WRITE key The set point value will be displayed Use the up arrow or
74. ine maximum deviation from average voltage 457 452 5v 464 457 7 v 457 455 2v Maximum deviation is 7 v Determine percent of voltage imbalance Voltage Imbalance 100 x 457 1 5396 This amount of phase imbalance is satisfactory as it is below the maximum allowable 2 IMPORTANT If the supply voltage phase imbalance is more than 296 contact your local electric utility company immediately 3 MCA calculation for units with electric heaters over 50 kW 1 25 x IFM amps 1 00 x heater FLA 15 0 ISTE UNIT SIZE 044 NOMINAL VOLTAGE 3 Ph 60 Hz 208 230 VOLTAGE RANGE Table 4 Electrical Data 50EJ EK EW EY024 048 cont COMPRESSOR POWER EXHAUST ELECTRIC HEAT POWER SUPPLY 187 FLA 223 1 218 9 esas 462 29 36 42 0 23 6 41 6 29 36 59 72 23 6 41 6 59 72 246 7 242 5 6 223 1 218 9 6 246 7 242 5 2 223 1 225 7 2 246 7 255 2 75 1 86 75 1 86 150 1 173 150 1 173 59 4 29 36 75 1 86 236 3 230 9 54 0 23 6 41 6 29 36 75 1 86 259 9 254 5 59 72 41 6 59 72 236 3 230 9 259 9 254 5 150 1 1 6 6 73 2 236 3 240 7 150 1 173 2 259 9 270 2 251 7 244 9 23 6 236 416 275 3 268 5 251 7 244 9 275 3 268 5 MOCPt 275 275 300 300 275 275 300 300 275 275 300 300 300 300 300 300
75. ing low voltage control wiring through factory drilled 7 diameter hole in condenser side post Use strain relief going into 7s in diameter hole in bottom of unit control box After wiring is in control box make connection to proper terminals on terminal blocks see Field Control Wiring sec tion on this page IMPORTANT THE VAV variable air volume units incorporate VFD variable frequency drives which gen erate use and can radiate radio frequency energy If units are not installed and used in accordance with these instructions they may cause radio interference They have been tested and found to comply with limits of a Class computing device as defined by FCC Federal Communications Commission regulations Subpart J of Part 15 which are designed to provide reasonable protection against such interference when operated in a commercial environment WARNING The unit must be electrically grounded in accordance with local codes and NEC ANSI NFPA 70 National Fire Protection Association Operating voltage to compressor must be within voltage range indicated on unit nameplate On 3 phase units volt ages between phases must be balanced within 296 and the current must be balanced within 10 Use the formula in Table 4 to determine the percentage of voltage imbalance 16 IMPORTANT If the supply voltage phase imbalance is more than 2 contact your local electric utility com pany immediately Unit fai
76. lure as a result of operation on improper line volt age or excessive phase imbalance constitutes abuse and may cause damage to electrical components On 208 230 v units transformer no 1 is wired for 230 v If 208 230 v unit is to be run with 208 v power supply the transformer must be rewired as follows Remove cap from red 208 v wire 2 Remove cap from spliced orange 230 v wire Discon nect orange wire from black unit power wire 3 Cap orange wire 4 Splice red wire and black unit power wire Cap wires IMPORTANT Be certain unused wires are capped Failure to do so may damage the transformers FIELD CONTROL WIRING Install either a Carrier approved accessory thermostat or a CCN Carrier Comfort Network compatible temperature sensor Thermostats are used on CV constant volume units only Control box diagrams are shown in Fig 14 and 15 Thermostat Wiring CV Only Install a Carrier approved accessory thermostat assembly per current price pages ac cording to the installation instructions included with the ac cessory or these instructions Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature Route thermostat cable or equivalent single leads of col ored wire from subbase terminals to low voltage connec tions as shown on unit label wiring diagram and in Fig 16 NOTE For wire runs up to 50 ft use no 18 AWG Ameri can Wire Gage insulated wire 35 C minimum
77. ly has an internal protector to protect it against exces sively high discharge gas temperatures Crankcase Heater Each compressor has a crankcase heater to prevent absorption of liquid refrigerant by oil in the crank case when the compressor is idle Since power for the crank case heaters is drawn from the unit incoming power main unit power must be on for the heaters to be energized IMPORTANT After a prolonged shutdown or serv ice job energize the crankcase heaters for 24 hours before starting the compressors EVAPORATOR FAN MOTOR PROTECTION A man ual reset calibrated trip magnetic circuit breaker protects against overcurrent Do not bypass connections or increase the size of the breaker to correct trouble Determine the cause and correct it before resetting the breaker If the evaporator fan motor is replaced with a different horsepower motor re sizing of the circuit breaker is required Contact Carrier Ap plication Engineering CONDENSER FAN MOTOR PROTECTION Each condenser fan motor is internally protected against overtemperature HIGH AND LOW PRESSURE SWITCHES If either switch trips or if the compressor overtemperature switch ac tivates that refrigerant circuit will be automatically locked out To reset manually move the thermostat setting FREEZE PROTECTION THERMOSTAT FPT An FPT is located on the evaporator coil for each circuit It detects frost build up and turns off the compressor
78. mber of degrees the supply air temperature may be raised Both the reset ratio and the reset limit are user definable The sequence of op eration is as follows 1 The on off status of the unit supply fan is determined 2 If the fan is on the sequence will check if the system is in Occupied mode 3 If the system is in Occupied mode the sequence will de termine if the reset option is enabled 4 If the reset option is enabled the sequence will read the space temperature and compare it to the Occupied Cool set point If the temperature is below the Occupied Cool set point the algorithm will compute the reset value and compare this value against the reset limit If it is greater than the reset limit the sequence will use the reset limit as the reset value 41 The field supplied space temperature sensor input signal 4 to 20 ma and 2 to 10 vdc enables the space temperature reset function Refer to Fig 36 for sensor wiring POWER EXHAUST OPERATION The optional power exhaust packages are factory or field installed with vertical units and optionally installed in the return air ductwork for horizontal applications The standard only offered with con stant volume units and modulating power exhaust offered on VAV units are the 2 packages available The modulating power exhaust package is equipped with a field adjustable static pressure controller which will control up to 4 power exhaust stages to maintain a building static pre
79. mestic crating Add 312 1 142 kg for export crating 024 034 units Add 346 Ib 157 kg for export crating 038 048 units Add 250 Ib 113 kg for power exhaust Add 220 Ib 100 kg for copper condenser coil 024 034 units Add 285 Ib 129 kg for copper condenser coil 038 044 units Add 380 Ib 172 kg for copper condenser coil 048 unit MODEL WEIGHT 50EJ EK EW EY ib ERE CENE NC mm in mm in mm kg i 024 1059 028 030 4102 1860 034 87 68 2227 68 5 1740 43 6 1107 038 1181 044 150 3810 1181 048 Sizes 038 and 048 are 50EJ EW units only 46 1 1171 Fig 7 Rigging Label Table 1 Physical Data NOMINAL CAPACITY tons 30 OPERATING WEIGHT Ib Unit AVAIT 4016 4102 4102 4102 Al Cut 4236 4322 4322 4322 Roof Curb 14 in curb 365 365 365 365 COMPRESSOR Type Ckt1 06D328 06D328 06D537 06D537 Ckt 2 06D818 06D328 06D328 06D537 Number of Refrigerant Circuits 2 2 2 2 oz Ckt 2 115 88 115 ea 115 ea 115 ea REFRIGERANT TYPE R 22 Operating Charge Ib oz Circuit 1 25 0 25 0 25 0 25 0 Circuit 2 31 0 25 0 25 0 25 0 CONDENSER COIL Cross Hatched 3 Copper Tubes Aluminum Lanced or Copper Fins Quantity 1 1 1 1 Rows Fins in 4 15 4 15 4 15 4 15 Total Face Area sq ft 33 3 33 3 33 3 33 3 CONDENSER FAN Propeller Type Nominal 13 420 13 420 13 420 13 420 Quantity Diameter in 2 30 2 30 2 30 2 30
80. move venturi on opposite side of bearing Lift out wheel Reverse above procedure to reinstall fan Check and adjust belt tension as necessary ON Q STRAIGHTEDGE MUST BE PARALLEL WITH BELT MOTOR AND FAN SHAFTS MUST BE PARALLEL Fig 38 Evaporator Fan Pulley Alignment and Adjustment Belt Tension Adjustment adjust belt tension Remove power to unit 2 Remove motor mount nuts and bolts 3 Loosen fan motor nuts See Fig 39 4 Turn motor jacking bolts to move motor mounting plate left or right for proper belt tension slight bow should be present in the belt on the slack side of the drive while running under full load Tighten nuts 6 Adjust bolts and nut on mounting plate to secure motor in fixed position Recheck belt tension after 24 hours of operation Adjust as necessary Condenser Fan Adjustment 1 Shut off unit power supply 2 Remove fan guard 3 Loosen fan hub setscrews 4 Adjust fan height on shaft using a straightedge placed across venturi and measure per Fig 40 5 Tighten setscrews and replace fan guard 6 Turn on unit power Evaporator Fan Motor Replacement 1 Shut off unit power supply 2 Remove upper outside panel and open hinged door to gain access to motor MOTOR JACKING BOLTS MOUNTING FAN MOTOR NUTS AND NUTS BOLT Fig 40 Condenser Fan Adjustment 44 Fully retract mo
81. n Overview Operating Sequence A large selection of product theory and skills programs is available All programs include a video cassette and or slides and a companion booklet Use these for self teaching or to conduct full training sessions For a free Service Training Material Catalog STM call 1 800 962 9212 Ordering instructions are included Copyright 1996 Carrier Corporation Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations 1 111 Catalog 535 006 Printed in U S A Form 50E 3SI Pg 54 8 96 Replaces 50E 1SI Tab 16 START UP CHECKLIST MODEL NO SERIAL NO SOFTWARE VERSION SEE FIG 15 TECHNICIAN DATE PRE START UP VERIFY THAT DIP SWITCH SETTINGS ARE CORRECT VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS VERIFY INSTALLATION OF ECONOMIZER HOOD VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT CHECK THAT INDOOR AIR FILTER IS CLEAN AND IN PLACE VERIFY THAT UNIT IS LEVEL WITHIN TOLERANCES CHECK FAN WHEELS AND PROPELLERS FOR LOCATION IN HOUSING ORIFICE AND VERIFY SET SCREW IS TIGHT VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED VERIFY THAT SUCTION DISCHARGE AND LIQUID LI
82. n the center of the circuit board is a set of 4 pins with a jumper labeled J2 This determines the mode of operation The bottom 2 pins must be jumpered for direct operation Direct operation means that the staging mod ules are activated in sequence as the input signal increases At the upper right corner of the board is a set of 5 pins and jumper which determines the time constant for the control The time constant is the delay in response built into the con trols The jumper should be on the middle or bottom 2 pins for the maximum time constant The delay can be decreased if desired by moving the jumper progressively upward al ways jumpering adjacent pins At the lower left corner of the board below the terminal strip is a resistor marked R27 This must be removed in or der to obtain the 0 to 10 vdc signal output There will not be a resistor on a factory supplied module but a resistor may be present on a replacement module and must be removed The R353 module has a terminal block with 7 connec tions available for wiring The 2 right hand terminals are for the 24 vac and common connections The next 2 terminals are for the 0 to 10 vdc signal Consult the wiring label for wire identification if replacing the module The 3 left hand terminals are not used for this application The 8353 module has an LED light emitting diode a set of 4 jumper pins and 2 potentiometers The LED will light whenever the module is activated providi
83. ng a visual indi cation of the number of exhaust fans running The jumper pins are arranged in a square format Two jumpers are used to determine the mode of operation direct or reverse The 2 jumpers must be arranged horizontally for direct action factory set 33 At the top of the module are 2 potentiometers The left potentiometer adjusts the offset The right potentiometer ad justs differential The potentiometers are factory set for a nominal 0 in wg building pressure The offset set point is defined as the point at which a mod ule turns off a fan and is measured in terms of percent of the input signal For control purposes 0 offset is at an arbitrary floor which is established at 1096 of the input signal or 1 vdc In this example the first stage will turn off at 30 3 vdc and the offset potentiometer will be set at 20 The second stage will turn off at 5096 signal 5 vdc and the off set potentiometer will be set at 4096 The fourth stage is at the maximum 75 offset which equates to 8596 signal or 8 5 vdc The offset potentiometer is calibrated in 1096 increments Table 8 relates building pressure to signal level Table 8 Potentiometer Signal Levels BUILDING PRESSURE SIGNAL LEVEL in wg vdc 0 50 2 0 25 4 0 00 6 0 25 8 0 50 10 If the building pressure is controlled at O in wg offset of the first stage should be set at 5096 which equates to 6096 of the input signal or 6 vdc The other st
84. o hood top 4 Apply black seal strip provided to mounting flanges of hood sides being sure to cover mounting holes See Fig 20 NOTE Each hood assembly has a slotted side that should be adjacent to the other hood when mounted to the unit 5 Apply black seal strip provided to hood top mounting flange Seal strip of hood top mounting flange must press tightly against seal strip of hood side mounting flanges See Fig 21 6 Add gray foam strip provided in package to cross mem bers on bottom tray See Fig 22 7 Place gray foam strip provided on inside of slotted hood side between filter and cross member opposite the mount ing end See Fig 23 8 Attach gray foam strip provided to block off baffle on outer face of flange See Fig 24 9 Remove the screws on each end and along top of damper assembly of unit Remove top 2 screws on each side of filter panel under damper assembly Set hood assembly in place and attach to unit using these screws 10 Attach accessory enthalpy bracket on hood side furthest from control box end Locate bracket on inside upper right hand corner of economizer hood using hood mount ing holes Mount outdoor air thermistor to enthalpy bracket if purchased Attach and wire enthalpy assembly Place quick connects on enthalpy wires 11 Remove screws along bottom of damper assembly Lo cate and mount blockoff baffle using these screws 12 Assemble 2 filter tracks side by side with the as sembled
85. ometric Relief Damper Hood Section on page 29 for more information Step 5 Trap Condensate Drain See Fig 3 6 and 10 for drain location Condensate drain is open to the atmosphere and must be trapped Install a trapped drain at 11 1B5V110 1B5V124 1B5V110 1B5V110 1B5V110 1B5V110 1B5V136 1B5V110 1B5V110 1B5V124 11 1 12 5 11 1 11 1 11 1 11 1 13 7 11 1 11 1 12 5 59 62 BX60 63 5VX590 59 BX56 59 BX56 59 5VX590 59 BX62 65 5VX590 59 5VX600 60 BX60 63 5VX590 59 5VX600 60 BX51 54 5VX630 63 5VX650 65 5VX630 63 5VX670 67 5VX680 68 5VX550 55 5VX560 56 5VX610 59 B 1 6875 B 1 6875 B 1 6875 B 1 6875 B 1 6875 B 1 6875 B 1 6875 B 1 6875 B 1 6875 B 1 6875 1B5V110 11 1 B 1 6875 1B5V110 11 1 B 1 6875 2B5V90 9 1 B 1 6875 1B5V124 12 5 B 1 6875 1B5V124 12 5 B 1 6875 1B5V124 12 5 B 1 6875 B 1 6875 B 1 6875 1B5V136 13 7 1B5V136 13 7 2B5V90 2B5V90 2B5V110 9 1 B 1 6875 9 1 B 1 6875 11 1 B 1 6875 EXHAUST AIR CONDENSATE DRAIN ECONOMIZER AIR RETURN AIR SUPPLY AIR Fig 9 Air Distribution Thru the Side the drain location One 1 in FPT coupling is provided in side unit evaporator section for condensate drain connec tion A trap at least 4 in deep must be used Trap must be installed to prevent freeze up Condens
86. other 30 seconds This will be repeated at every 1096 increment for 30 seconds until the damper reaches 10096 open Close DIP switch no 6 dur ing the 30 seconds immediately after the desired outdoor air minimum damper position The 30 second time period is to allow time where DIP switch no 6 can be closed The de fault value of the minimum outdoor air damper position is 20 If the desired minimum position is 3096 allow the damper BLACK SEAL STRIP CENTERED FILTER COVER Fig 27 Attaching Seal Strip to Filter Cover HH57AC077 HH57AC078 ENTHALPY SENSOR USED WITH ENTHALPY CONTROL FOR DIFFERENTIAL ENTHALPY OPERATION Fig 28 Differential Enthalpy Control and Sensor ENTHALPY CONTROL 28 position to go to 10 for 30 seconds then 2096 for 30 sec onds and when it reaches 3046 close DIP switch no 6 dur ing the 30 second period following the 30 position The minimum outdoor air damper position is now set ECONOMIZER SETTINGS Accessory Enthalpy Control Fig 28 The control 57 077 is mounted in the economizer hood See Fig 19 The enthalpy setting adjustment is on the enthalpy control For maximum benefit of outdoor air set enthalpy control to A See Fig 29 and 30 Accessory Differential Enthalpy Control The control 57 077 in conjunction with
87. ower outages For complete Carrier Comfort System CCS or Carrier Comfort Network CCN features and benefits refer to the product literature VARIABLE AIR VOLUME VAV APPLICATIONS Features with Stand Alone Applications A VAV unit is capable of providing unoccupied cooling controlling to a 90 F return air temperature utilizing the factory supplied return air thermistor located below the return air damper in the return air section for unit control The unit will provide unoccupied heating if electric heat is installed controlling to a 55 F return air temperature Also provided is a morning warm up which is initiated by the Occupied mode if electric heat is installed and continues until the return air temperature rises to 68 E The unit will provide occupied cooling with a de fault temperature of 55 F for the supply air The supply air temperature is measured by the supply air thermistor lo cated in the indoor fan compartment Standard features of a VAV unit with a remote start stop switch are control of an outdoor condenser fan based upon outdoor air temperature control of modulating economizer to provide free cooling when outdoor conditions are suitable using supply air tem perature as a set point support of remote occupied unoccupied input to start or stop the unit provide power exhaust output to an external power ex haust controller support supply air temperature reset to offset supply air set point
88. pplied 90 elbow must be installed in the supply ductwork below the unit discharge LEGEND VFD Variable Frequency Drive ONDENSER COIL HOODS FIELD INSTALLED CINCLUDED WITH UNIT 42 518 ECONOMIZER HOODS 110821 JE 76 82 1 32 INSIDE BASE RAILS frin 1 1210 2083 UNIT SIZE OPERATING Ib Fig 3 Base Unit Dimensions 50EJ EK024 034 1080 1189 1189 1189 POWER EXHAUST OR BAROMETRIC RELIEF HOODS 10 1 2 50 12661 12101 2 9 16 65 5 172 140 INSIDE BASE RAIL ACCESS DOORS HINGED CONTROL BOX COMPRESSOR 2 42 518 1083 T L610 RETURN 13 178 88 1 4 18571 22411 1 COVERS RETURN 118 DIA 221 24 SC LOW VOLTAGE 610 SUPPLY 19 gt 29 13 32 24 13 32 741 620 15 15 16 4 9 11 15 32 1405 1 9 9 16 ae 8 19 32 108 18 Y 2431 2 3 32 2181 E2146 1 RETURN SUPPE 0 3 1 2 89 NPT FIELD POWER 1531 04 314 19 NPT LOW VOLTAGE 82 1 32 120831 SIPE BASE 134 15 32 134151 ECONOMIZER HOODS HOODS FIELD INSTALLED INCLUDED WITH UNIT 2 REQ D INDOOR MOTOR ACCESS DOOR HINGED INDOOR BLOWER ACCESS PANEL ONDENSER COIL BOTH SIDES FILTER ACCESS DOOR HINGED HEAT SECTION ACCESS PANEL
89. r Service Tool software the following features can be accessed on board timeclock can be programmed occupancy schedules can be programmed unit set points can be changed alarms can be monitored This access is available on the base control board via a RJ 11 phone jack or a 3 wire connection to the communi cation bus See Fig 12 The timeclock has a 10 hour mini mum back up time to provide for unit power off for servic ing unit or during unexpected power outages For complete Carrier Comfort System CCS or Carrier Comfort Network CCN features and benefits refer to the product literature Step 7 Make Electrical Connections POWER WIRING Units are factory wired for the voltage shown on the unit nameplate The main terminal block is suitable for use with aluminum or copper wires and is sized for single point electric heat When installing units provide a disconnect per NEC Na tional Electrical Code of adequate size MOCP maximum overcurrent protection of unit is on the informative plate field wiring must comply with NEC and all local codes Size wire based on MCA minimum circuit amps on the unit informative plate See Fig 13 for power wiring con nections to the unit power terminal block and equipment ground The main power terminal block is suitable for use with aluminum or copper wire See Fig 13 Units have circuit breakers for compressors fan motors and control circuit If required by local codes p
90. r space temperature against comfort set points and control heating or cooling stages as required If the system is in the Occu pied mode the economizer will operate as required If the system is in Unoccupied mode the system will perform night time free cool and IAQ indoor air quality pre occupancy purge as required when functions are enabled via software Whenever the DX direct expansion cooling is requested the outdoor fan will operate Table 12 Fan Performance 50EJ EK024 034 Vertical Discharge Units FOR EW EY UNITS REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0 3 IN WG AVAILABLE EXTERNAL STATIC PRESSURE in wg AIRFLOW Cfm NOOO OA n dx CO CO TO IO NISN O o gt ao AIRFLOW Cfm AIRFLOW LEGEND Bhp Brake Horsepower NOTES 1 Fan performance is based on wet coils economizer roof curb cabinet losses and clean 2 in filters 2 Conversion Bhp to watts Bhp x 746 Motor efficiency 3 VAV units will operate down to 70 cfm ton Watts 36 Table 13 Fan Performance 50EJ038 044 and 50 044 Vertical Discharge Units For EW EY UNITS REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0 5 IN WG AVAILABLE EXTERNAL STATIC PRESSURE in wg AIRFLOW Cfm AIRFLOW Cfm LEGEND Bhp Brake Horsepower NOTES 1 Fan performance is based on wet coils economizer roof curb cabinet lo
91. rease or decrease the heating demand use the network access soft ware to change the occupied heating set point NOTE To utilize morning warm up mode the unit occu pancy schedule must be accessed via Service Tool Comfort Works or Building Supervisor software units running Ver sion 1 0 of unit control software MORNING WARM UP VAV ONLY WITH STAND ALONE OPERATION When a unit running version 2 0 of the unit control software operates in stand alone mode morning warm up occurs when the unit is energized in Occupied mode and return air temperature RAT is below 68 F Warm up will not terminate until the RAT reaches 68 F The heat in terlock relay output is energized during morning warm up A field installed 24 vdc heat interlock relay is required The output will be energized until the morning warm up cycle is complete Refer to Fig 35 for heat interlock relay wiring SPACE TEMPERATURE RESET VAV ONLY An ac cessory space temperature sensor is required Space tem perature reset is used to reset the supply air temperature set point of a VAV system higher as the space temperature falls below the Occupied Cool set point As the space tempera ture falls below the cool set point the supply air tempera ture will be reset upward as a function of the reset ratio Re set ratio is expressed in degrees change in supply air temperature per degree of space temperature change A reset limit will exist which will limit the maximum nu
92. rovide an additional disconnect per NEC and local codes requirements of adequate size Table 4 Whenever external electrical sources are used unit must be electrically grounded in accordance with local codes or in absence of local codes with NEC ANSI American National Standards Institute C1 latest year field wiring must comply with NEC and local code requirements FIELD POWER SUPPLY Unit is factory wired for volt age shown on nameplate See Table 4 for electrical data Field wiring can be brought into the unit from bottom through basepan and roof curb or through side of unit cor ner post next to control box r FIELD p S uo PP z nde z oc E77 EQUIP GND Lu LEGEND EQUIP Equipment GND Ground NEC National Electrical Code TB Terminal Block NOTE Maximum wire size for TB1 is 500 MCM Fig 13 Field Power Wiring Connections 3 in NPT coupling for field power wiring and Ya in NPT coupling for 24 v control wiring are provided in basepan In the side post there two 22 024 034 3 in 038 048 knockouts for the field power wiring See Fig 3 6 If control wiring is to be brought in through the side of unit a in diameter hole is provided in the con denser side post next to the control box If disconnect box is mounted to corner post be careful not to drill an
93. s 2 Pivot each damper assembly outward until edges of damper assembly rest against inside wall of unit A CAUTION Be careful when tilting blower assembly Hoods and blowers are heavy and can cause injury if dropped 3 Secure each damper assembly to unit with 6 screws across top 3 screws provided and bottom 3 screws from Step 1 of damper 4 With screws saved from Step 1 install brackets on each side of damper assembly 5 Remove tape from damper blades VAV DUCT PRESSURE TRANSDUCER The VAV duct pressure transducer VAV inverter pressure transducer is lo cated behind the filter access door on the lower inner panel See Fig 32 A section of 4 plastic tubing must be run from the high pressure tap on the differential pressure switch and connected to a tap in the supply air duct The tap is usu ally located of the way out on the main supply duct Re move plug button in panel to route tubing VAV BUILDING PRESSURE TRANSDUCER The VAV building pressure transducer modulating power exhaust pres sure transducer is located behind the filter access door on the inner panel See Fig 32 A section of 1 4 in plastic tub ing must be run from the high pressure tap on the differen tial pressure switch to the conditioned space The pressure tube must be terminated in the conditioned space where a constant pressure is required This location is usually in an entrance lobby so that the building exterior
94. sed on outdoor air temperature control of modulating economizer damper to provide free cooling when outdoor conditions are suitable using sup ply air temperature as a control point control of the economizer damper and indoor fan to obtain unoccupied free cooling provide power exhaust output to an external power ex haust controller support a field test for field checkout control of 2 stages of CV power exhaust compressor Time Guard power up and minimum off and on times Additional features are provided by accessing the stand ard unit control board via software with a computer These features are electronic expansion board features if installed compressor lockout during low supply air temperature control board diagnostics ability to change supply air set point economizer control ability to change high outdoor air temperature lockout set point economizer control ability to change power exhaust set points NOTE A CV unit without a thermostat requires a field supplied sensor for operation Features with Sensor Control of Unit Stand Alone Appli cations Unit control is limited to CV unoccupied default set points 90 F for cooling 55 F for heating There are 3 sensor options available 57 sensor will monitor room temperature T 55 sensor will monitor room temperature and provide unoccupied override capability 1 hour T 56 sensor will monitor room temperature provide un oc
95. sion board features if installed field test capability control of the economizer damper and indoor fan to op tion unoccupied free cooling 365 day timeclock with backup supports minute hour day month and year holiday table containing up to 18 holiday schedules occupancy control with 8 periods for unit operation support a set of display maintenance configuration serv ice and set point data tables for interface with Building Supervisor Comfort Works or Service Tool When a VAV unit with a space temperature sensor is ac cessed via a computer the following additional features are available ability to initiate timed override from T 55 sensors ability to use multiple space temperature sensors to aver age space temperature temperature compensated start to calculate early start time before occupancy provide space temperature reset to reset the supply air set point upward when the temperature falls below the occu pied cooling set point An electronic expansion board may be field installed to provide the following features fan status filter status field applied status demand limiting IAQ sensor OAQ sensor alarm light When the unit is connected to the CCN Carrier Comfort Network the following expansion board features can be utilized CCN IAQ indoor air quality participation CCN OAQ outdoor air quality participation CCN demand limit participation fire unit shutdown fire pressurization fire evacuation
96. ss is 0 Default ele ment number is 1 Refer to CCN literature for infor mation on network addressing or changing CCN com munication defaults Carrier Comfort Network Interface The 50E units can be connected to the CCN The communication bus wiring is sup plied and installed in the field Wiring consists of shielded 3 conductor cable with drain wire The system elements are connected to the communication bus in a daisy chain arrangement The positive pin of each system element communication connector must be wired to the positive pins of the system element on either side of it the negative pins must be wired to the negative pins and the signal pins must be wired to signal ground pins Wiring con nections for CCN should be made at the 3 pin plug CCN located at the base board Consult CCN literature for further information 25 Conductors and drain wire must be 20 AWG minimum stranded tinned copper Individual conductors must be in sulated with PVC PVC nylon vinyl Teflon or polyethyl ene aluminum polyester 100 foil shield and an outer jacket of PVC PVC nylon chrome vinyl or Teflon with a minimum operating temperature range of 20 C to 60 C 4 F to 140 F is required Table 5 lists cables that meet the requirements Table 5 CCN Connection Approved Shielded Cables MANUFACTURER CABLE PART NO Alpha 2413 or 5463 American 22503 Belden 8772 Columbia 02525 IMPORTANT When connecting th
97. sses and clean 2 in filters 2 Conversion Bhp to watts Bhp x 746 Motor efficiency 3 VAV units will operate down to 70 cfm ton AIRFLOW Watts 37 Table 14 Fan Performance 50EJ048 Vertical Discharge Units FOR EW UNITS REDUCE NET AVAILABLE EXTERNAL STATIC PRESSURE BY 0 5 IN WG AVAILABLE EXTERNAL STATIC PRESSURE in wg AIRFLOW 1 6 cm 02 12 Pram En Bhp Rpm me mem mm Fom Gp om Bip Tum Bhp 13 000 11 66 14 000 13 44 15 000 15 42 16 000 17 59 17 000 19 98 18 000 22 58 19 000 25 40 20 000 28 46 AVAILABLE EXTERNAL STATIC PRESSURE in wg 1 8 2 0 2 2 2 4 2 6 2 8 3 0 3 2 Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Bhp 13 000 15 93 14 000 17 86 15 000 19 99 16 000 22 31 17 000 18 000 19 000 20 000 AVAILABLE EXTERNAL STATIC PRESSURE in wg LEGEND ss ll C s Bhp Brake Horsepower Rpm Bhp Rpm Bhp Rpm Bhp NOTES 13 000 1124 16 48 1148 17 03 1171 17 59 1 Fan performance is based on wet coils economizer roof curb 14 000 1150 18 43 1173 19 00 1195 19 57 cabinet losses and clean 2 filters 15 000 1177 20 57 1199 21 16 2 Conversion Bhp to watts 16 000 17 000 Wats BB 18 000 Motor efficiency 19 000 3 VAV units will operate down to 70 cfm ton Table 15 Air Quantity Limits UNIT MINIMUM HEATING MINI
98. ssure The blue sequencer located in the control box below the control board can be adjusted by removing the covers and adjusting the set point dial to the desired building pressure The standard power exhaust package controls up to 2 stages of power exhaust to maintain building pressure These power exhaust stages are staged according to a percentage of the economizer damper position The default values are 25 for Stage 1 and 75 for Stage 2 This package has set points that are adjustable through software such as Service Tool Building Supervi sor or Comfort Works MAIN CONTROL BOARD T29 T31 LIE EJ HEAT INTERLOCK FIELD SUPPLIED Fig 35 Heat Interlock Relay Wiring ACCESSORY SPACE TEMPERATURE SENSOR 0000000000000000 1 T2 T3 T4 T5 T6 T7 T8 79 T10 11 T12 T13 T14 T15 T16 CONTROL BOARD BASE MODULE Fig 36 Space Temperature Sensor Wiring CAPACITY CONTROL COOLING The cooling capac ity staging tables are shown in Tables 18 and 19 Table 18 Cooling Capacity Staging Table CV Units with 2 Compressors sors o economzen 2 Compressor1 Of On On Compessorz of Of OF on NOTE On CV units that require additional unloading add suction pres sure unloaders on Compressor 1 only Table 19 Cooling Capacity Staging Table VAV Units with 2 Compressors and 2 Unloaders STAGES 0 1 2 3 4 5 6 Compressor 1 On Unloader 1 Off Unloader 2
99. support a field test for field check out support linkage to DAV systems cooling capacity control of 6 stages plus economizer with compressors and unloaders to maintain supply air tem perature set point during occupied periods control of one stage of heat to maintain supply air tem perature at supply air set point during occupied periods provide a variable frequency drive high voltage relay out put to enable control of heat interlock relay With the addition of a remote start stop switch heating or cooling is enabled during unoccupied periods as required to maintain space temperature to within unoccupied set points REMOTE START STOP SWITCH VERSION 1 0 VERSION 2 0 CONTROL BOX NOTE On units running Version 1 0 of the Unit Control Software the remote start stop switch is connected to R and Y1 On units running Version 2 0 of the Unit Control Software the remote start stop switch is connected to R and W1 Fig 11 Field Control Remote Start Stop
100. tch 8 is on the right of the block To open a DIP switch push the switch up with suitable tool small blade screwdriver To close a DIP switch push the switch down Factory settings are shown in Tables 11A and 11B Table 10A DIP Switch Configuration Version 1 0 of Unit Control Software 8 Modulated Time Guard Override pansion Power Set Min Gas Heat Factory Test ON Exhaust Damper Pos ON CV Time Guard Override TSTAT Base Board Power OFF Set Min Electric Heat Factory Test OFF Onl Exhaust Damper Pos OFF LEGEND NOTES 1 The Factory Test DIP switch should not be enabled in the field CON cs SMS 2 The OPEN side of the DIP switch is marked OPEN When the l O Input Output rocker switch is on the OPEN side of the switch the switch is POS Position open TSTAT Thermostat 3 If DIP switch no 1 is open DIP switch no 2 is ignored since VAV VAV Variable Air Volume units control to supply air temperature Table 10B DIP Switch Configuration Version 2 0 of Unit Control Software SETTING 8 VAV Space Sensor Occupied Time Guard Override Installed ON Expansion Field Test Enabled Heat Pump OPEN Board ON IN CONJUNCTION Gas Heat Operation CV CON or Sensors Modulated WITH FIELD TEST Used Power Set Minimum Exhaust Damper Position Occupied VAV No Space Sensor Heat Base Control Field Test Pisapied Time Guard Override Air Conditioner
101. tdoor air conditions Inspect coil monthly clean as required CONDENSATE DRAIN Check and clean each year at start of cooling season In winter keep drains and traps dry FILTERS Clean or replace at start of each heating and cooling season or more often if operating conditions re quire Refer to Table 1 for type and size NOTE The unit requires industrial grade throwaway filters capable of withstanding face velocities up to 625 fpm OUTDOOR AIR INLET SCREENS Clean screens with steam or hot water and a mild detergent Do not use throw away filters in place of screens Lubrication COMPRESSORS Each compressor is charged with the correct amount of oil at the factory The correct oil charge is shown in Table 1 If oil is visible in the compressor sight glass check unit for operating readiness as described in Start Up section then start the unit Observe oil level and add oil if required to bring oil level in compressor crankcase up to between 4 and of sight glass during steady operation If oil charge is above sight glass do not remove any oil until the compressor crankcase heater has been energized for at least 24 hours with compressor off When additional oil or a complete charge is required use only Carrier approved compressor oil Petroleum Specialties Inc Cryol 150 Texaco Ine evertere en Capella WF 32 Witco Chemical Corp Suniso 365 IMPORTANT Do not
102. the accessory enthalpy sensor 57 078 controls economizer operation ac cording to the differential enthalpy The control is mounted in the economizer hood The sensor is mounted in the return duct SOEJ EK or return air plenum 50EW EY PL4 1 PL4 2 620 ohm JUMPER PL4 4 NOTE Switches shown in high enthalpy state Terminals 2 and 3 close on en thalpy decrease Fig 29 Wire Connections for Solid State Enthalpy Control HH57AC077 CONTROL POINT APPROX DEG AT 50 RH CONTRO CURVE 100 105 110 iC RELATIVE HUMIDITY 0 85 90 95 100 105 11 5 14 5 17 110 13 15 5 18 5 211 24 26 5 29 5 32 1351 381 40 5 DRY BULB TEMPERATURE APPROXIMATE FAHRENHEIT CELSIUS RH Relative Humidity Fig 30 Psychrometric Chart for Enthalpy Control Step 9 Position Power Exhaust Barometric Relief Damper Hood electrical connections have been made and adjusted at the factory The power exhaust blowers and barometric relief dampers are shipped as sembled and tilted back into the unit for shipping Brackets and extra screws are shipped in shrink wrap around the damp ers If ordered each unit will have 4 power exhaust blowers and motors or 4 barometric relief dampers 1 Remove 9 screws holding each damper assembly in place See Fig 31 Each damper assembly is secured with 3 screws on each side and 3 screws along the bottom Save screw
103. tivate the initialization software The initialization software reads DIP switch no 1 position to determine CV or VAV operation Next DIP switch no 2 is read to determine if the control is TSTAT or sensor type operation The initialization sequence clears all alarms and alerts re maps the input output database for CV opera tion sets maximum heat stages to 2 and sets maximum cool stages to 3 The control module reads DIP switch no 3 and determines if the unit will use expansion mode operation The TSTAT function performs a thermostat based control by monitoring Y1 Y2 W1 W2 and inputs These func tions control stages cooll cool2 1 heat2 and the in door fan respectively If the TSTAT function is not selected the control module determines the occupancy state based on the system time schedules or with remote occupied unoccupied input If Temperature Compensated Start is active the unit will be controlled as in the Occupied mode User defined set points are shown in Table 17 Occupied or unoccupied comfort set points must be se lected Use of the space temperature offset input can also be configured The control module will set appropriate operat ing mode and fan control The control module will turn on indoor fan if in Occupied mode or if the unit is in Unoccu pied mode and the space temperature is outside of the un occupied comfort set points Unoccupied Heat or Unoccu pied Cool The control module will then monito
104. tor plate adjusting bolts 4 Loosen the 2 rear nearest the evaporator coil motor plate nuts 5 Remove the 2 front motor plate nuts and carriage bolts 6 Slide motor plate to the rear toward the coil and re move fan belt s 7 Slide motor plate to the front and hand tighten one of the rear motor plate nuts tight enough to prevent the motor plate from sliding back but loose enough to allow the plate to pivot upward 8 Pivot the front of the motor plate upward enough to al low access to the motor mounting hex bolts and secure in place by inserting a prop 9 Remove the nuts from the motor mounting hex bolts and remove motor 10 Reverse above steps to install new motor Power Failure Dampers have a spring return In event of power failure dampers will return to fully closed position until power is restored Refrigerant Charge Amount of refrigerant charge is listed on unit nameplate and in Table 1 Refer to Carrier GTAC II Module 5 Charging Recovery Recycling and lamation section for charging methods and procedures Unit panels must be in place when unit is operating dur ing charging procedure NO CHARGE Use standard evacuating techniques After evacuating system weigh in the specified amount of refrig erant refer to Table 1 LOW CHARGE COOLING Using appropriate cooling charging chart see Fig 41 and 42 add or remove refrig erant until conditions of the appropriate chart are m
105. unit components can be reached through clearly labelled hinged access doors These doors are not equipped with tiebacks so if heavy duty servicing is needed either remove them or prop them open to prevent accidental closure Each door is held closed with 3 latches The latches are secured to the unit with a single 4 in 20 x 2 in long bolt See Fig 37 To open loosen the latch bolt using a 7A4e in wrench Pivot the latch so it is not in contact with the door Open the door To shut reverse the above procedure NOTE Disassembly of the top cover may be required under special service circumstances It is very important that the orientation and position of the top cover be marked on the unit prior to disassembly This will allow proper replace ment of the top cover onto the unit and prevent rainwater from leaking into the unit IMPORTANT After servicing is completed make sure door is closed and relatched properly and that the latches are tight Failure to do so can result in water leakage into the evaporator section of the unit LATCH BOLT Fig 37 Door Latch Cleaning Inspect unit interior at beginning of each heat ing and cooling season and as operating conditions require Remove unit top panel and or side panels for access to unit interior EVAPORATOR COIL Clean as required with a commer cial coil cleaner CONDENSER COIL Clean condenser coil annually and as required by location and ou
106. ure supply air temperature reset for the supply air temperature set point temperature compensated start to calculate early start times before occupancy access to the Display Maintenance Configuration Serv ice and Set Point data table through network software When the unit is equipped with a field supplied space tem perature sensor and a remote contact closure remote start stop on the base control board the occupied default set points will monitor unit operation The occupied default set points are 78 F cooling and 68 F heating if electric heat is in stalled See Fig 11 for remote start stop wiring NOTE For units which have not had the base unit control board accessed via software to set an occupancy schedule the remote start stop closure will allow the unit to operate in the pre configured occupied default set points based on return air temperature of 78 F cooling and 68 F heating Without this feature the unit will control to the unoccupied default set points of 90 F cooling and 55 F heating if electric heat 15 installed An electronic expansion board may be field installed to provide the following features control of modulating economizer damper to maintain indoor air quality IAQ when outdoor conditions are suitable provide discrete inputs for fan status filter status field applied status and demand limit provide an output for the external alarm light indicator When the unit is connected to
107. ust DIP switch 6 configures the Time Guard override and the minimum damper position DIP switch 7 configures the unit for gas heat or electric heat DIP switch 8 is used to factory test the unit The DIP switch configurations for Version 2 0 of the unit control software are as follows DIP switch 1 configures the unit to operate as a VAV or CV unit DIP switch 2 configures the unit to use a space sensor VAV units or a thermostat CV units DIP switch 3 configures the DDC for use with an elec tronic expansion board DIP switch 4 is used to field test the unit DIP switch 5 is used to enable occupied heating VAV units or specify the type of power exhaust CV units DIP switch 6 configures the Time Guard override and when used with the field test function sets the minimum damper position DIP switch 7 configures the unit for gas heat or electric heat DIP switch 8 configures the unit for heat pump or air con ditioner operation Crankcase Heater s Heater s is energized as long as there is power to the unit except when the compressors are operating IMPORTANT Unit power must be on for 24 hours prior to start up Otherwise damage to compressor may result Evaporator Fan Fan belt and fixed pulleys are factory installed See Tables 12 14 for Fan Performance Data See Table 15 for Air Quantity Limits See Table 16 for Motor Limitation data Be sure that fans rotate in the proper di rection Static pressure drop for
108. where a phase imbalance in supply voltage is greater than 296 Use the following formula to determine the percent of voltage imbalance max voltage deviation from average voltage average voltage 9 gt Voltage Imbalance 100 x EXAMPLE Supply voltage is 460 3 60 452 v A B 464 v 495v 452 464 455 Average Voltage _ 1371 Erg 457 19 VOLTAGE No 1 No 2 3 Ph 60 Hz Mi RLA RLA LRA Qty FLA ea kW FLA MCA 151 9 149 1 200 200 23 6 41 6 175 5 172 7 225 225 30 8 29 36 751 86 6 151 9 149 1 200 200 28 0 23 6 41 6 29 36 75 1 86 6 175 5 172 8 225 225 73 2 73 2 3 3 7 MOCPt 200 225 225 250 200 200 225 225 200 200 59 72 150 1 173 188 6 208 2 23 6 41 6 59 72 150 1 173 218 1 237 7 167 3 163 1 23 6 41 6 190 9 186 7 15 46 2 29 36 75 1 86 6 167 3 163 1 42 0 23 6 41 6 29 36 75 1 86 6 190 9 186 7 225 225 59 72 150 1 173 2 207 9 225 7 250 250 41 6 59 72 150 1 173 2 237 4 255 2 275 275 180 5 175 1 225 225 204 1 198 7 250 250 20 j 3 d 180 5 175 1 225 225 204 1 198 7 250 250 150 1 1 224 4 240 7 275 275 150 2 1 253 9 270 2 300 300 100 90 100 110 125 100 110 100 110 125 150 100 110 100 110 125 150 70 90 70 90 90 100 80 90 80 90 100 110 80 100 80 100 110 125
109. y screws into the condenser coil Routing Through Bottom of Unit If wiring is brought in through bottom of unit use field supplied watertight conduit to run power wiring from basepan out through bottom 31 2 in hole to the disconnect box and back into unit to the main control box Use strain relief going into control box through 2 2 diameter hole provided After wires are in unit control box connect to power terminal block see Power Wiring section on this page 15 Low voltage wiring must be run in watertight conduit from the basepan to control box and through 7 in diameter hole provided in bottom of unit control box Field supplied strain relief must be used going into the box After wiring is in control box make connections to proper terminals on ter minal blocks see Field Control Wiring section on this page Install conduit connector in unit basepan or side panel open ings provided Route power and ground lines through con nector to connections in unit control box as shown on unit wiring diagram and Fig 13 Routing Through Side of Unit Route power wiring in field supplied watertight conduit into unit through 2 2 or 3 in hole Strain relief field supplied must be used in hole See Fig 13 Use field supplied strain relief going into control box through 21 2 or 3 in diameter hole provided After wires are in unit control box connect to power terminal block see Power Wir ing section on page 15 Br

Carrier 50EJ Air Conditioner User Manual

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