Carrier 50HJ004, 50HE003-006 installation instructions Cooling Service Analysis

Page 69

Table 36—Cooling Service Analysis

PROBLEM

CAUSE

REMEDY

 

Compressor and Condenser Fan

Power failure.

Call power company.

 

Will Not Start.

 

 

 

 

Fuse blown or circuit breaker tripped.

Replace fuse or reset circuit breaker.

 

 

Defective thermostat, contactor, transformer, or

Replace component.

 

 

control relay.

 

 

 

 

Insufficient line voltage.

Determine cause and correct.

 

 

Incorrect or faulty wiring.

Check wiring diagram and rewire correctly.

 

 

Thermostat setting too high.

Lower thermostat setting below room temperature.

 

Compressor Will Not Start

Faulty wiring or loose connections in compres-

Check wiring and repair or replace.

 

But Condenser Fan Runs.

sor circuit.

 

 

 

 

Compressor motor burned out, seized, or in-

Determine cause. Replace compressor.

 

 

ternal overload open.

 

 

 

 

Defective run/start capacitor, overload, start

Determine cause and replace.

 

 

relay.

 

 

 

 

One leg of 3-phase power dead.

Replace fuse or reset circuit breaker. Determine

 

 

 

cause.

 

Compressor Cycles (Other Than

Refrigerant overcharge or undercharge.

Recover refrigerant, evacuate system, and recharge

 

Normally Satisfying Thermostat).

 

to nameplate.

 

 

 

Defective compressor.

Replace and determine cause.

 

 

Insufficient line voltage.

Determine cause and correct.

 

 

Blocked condenser.

Determine cause and correct.

 

 

Defective run/start capacitor, overload, or start

Determine cause and replace.

 

 

relay.

 

 

 

 

Defective thermostat.

Replace thermostat.

 

 

Faulty condenser-fan motor or capacitor.

Replace.

 

 

Restriction in refrigerant system.

Locate restriction and remove.

 

Compressor Operates Continuously.

Dirty air filter.

Replace filter.

 

 

Unit undersized for load.

Decrease load or increase unit size.

 

 

Thermostat set too low.

Reset thermostat.

 

 

Low refrigerant charge.

Locate leak, repair, and recharge.

 

 

Leaking valves in compressor.

Replace compressor.

 

 

Air in system.

Recover refrigerant, evacuate system, and recharge.

 

 

Condenser coil dirty or restricted.

Clean coil or remove restriction.

 

Excessive Head Pressure.

Dirty air filter.

Replace filter.

 

 

Dirty condenser coil.

Clean coil.

 

 

Refrigerant overcharged.

Recover excess refrigerant.

 

 

Air in system.

Recover refrigerant, evacuate system, and recharge.

 

 

Condenser air restricted or air short-cycling.

Determine cause and correct.

 

Head Pressure Too Low.

Low refrigerant charge.

Check for leaks, repair, and recharge.

 

 

Compressor valves leaking.

Replace compressor.

 

 

Restriction in liquid tube.

Remove restriction.

 

Excessive Suction Pressure.

High heat load.

Check for source and eliminate.

 

 

Compressor valves leaking.

Replace compressor.

 

 

Refrigerant overcharged.

Recover excess refrigerant.

 

Suction Pressure Too Low.

Dirty air filter.

Replace filter.

 

 

Low refrigerant charge.

Check for leaks, repair, and recharge.

 

 

Metering device or low side restricted.

Remove source of restriction.

 

 

Insufficient evaporator airflow.

Increase air quantity. Check filter and replace if neces-

 

 

 

sary.

 

 

Temperature too low in conditioned area.

Reset thermostat.

 

 

Outdoor ambient below 25 F.

Install low-ambient kit.

 

Evaporator Fan Will Not Shut Off.

Time off delay not finished.

Wait for 30-second off delay.

 

50HE,HJ

69

Image 69
Contents Installation Instructions Alternate Unit Support Provide Unit Support Roof CurbRoof Curb Details Unit Leveling Tolerances Positioning50HJ 50HE50HJ004-007 Base Unit Dimensions 50HE003-006 Base Unit Dimensions Heat Anticipator Settings Field Power SupplyField Control Wiring Make Electrical ConnectionsHi-Static Physical Data 50HJBase Unit 50HE Physical Data 50HEPower Wiring Connections Electrical Data-50HE None YES Min Max PH---HzActual kW B00006 008,009 23.4 30.1 40.8 KW† Electrical Data-50HJ006 11.8 414 508 007 10.6 16.0 008 13.8 20.0 Ton 004+005 19.9 24.3 55.2 76.3 86.9 168 34.9 173 002 13.6 007 A00 or008 Humi 009 18.4 111 518 632 018 17.0 16.4 23.9 10 ton 01218.7 133 518 632 17.0 16.4 24.6 019 34.0 32.7 45.0 A00 or Actual kW 01412.5 Assembly Disconnect SwitchHumidi-MizerAdaptive Dehumidification System Manual Outdoor DamperTypical Humidi-MiZer t Adaptive Dehumidification System Outdoor Air Temperature Sensor OAT Install the Supply Air Temperature SAT SensorInstall the Indoor Air Quality CO2 Sensor Enthalpy Sensors and ControlRequired PremierLinkSensor UsageOr Equivalent Not UsedPremierLinktController Installed EconoMi$er IV Component Locations Return Air Enthalphy SensorHood Box Removal Supply Air Sensor Temperature Resistance Values Supply Air Temperature SAT SensorOutdoor Air Lockout Sensor Economi$er IV Control ModesEconoMi$er IV Wiring Exhaust Set Point Adjustment Differential Enthalphy ControlIndoor Air Quality IAQ Sensor Input Minimum Position Control ThermostatsDamper Movement + TR Adjust Evaporator-Fan Speed Dehumidification of Fresh Air with DCV ControlBelt Drive Motors Belt Drive Motor Mounting CO2Sensor Standard SettingsEvaporator-Fan Motor Data High-Static Motors Evaporator-Fan Motor Data Standard Motor600 900 1200 1400 1600 1800 2000 2200 2400 2600 Evaporator-Fan Motor Efficiency003,004,005 006 74/84 007 External Static Pressure in. wg879 Rpm Bhp Watts 900 566 142 690 228957 522 1000 598 173 718 267 9031300 701 809 418 902 540 983 665 Rpm Bhp Watts 1200 666 252 778 361 873 476 956 5941400 737 355 842 481 932 610 875 551 962 6891600 828 412 931 536 1022 670 Rpm Bhp Watts 1500 790 353 897 471 991 6001700 866 478 966 608 1800 905 551 1001 6871472 1761 1600 1462 20671495 1858 1700 1463 1766 1520 1964 18002300 1104 1046 1185 1212 1260 1386 2200 1063 929 1147 1089 1224 1256 1295 14312400 1145 1174 1223 1346 1296 1526 2500 1185 1311 1262 14901900 945 638 1042 796 Rpm Bhp Watts 1800 907 558 1006 708 1092 8602000 984 727 1078 892 2100 1024 823 1115 9972200 1063 929 1152 1111 1230 1294 2100 1024 823 1115 997 1195 1173 1268 13502300 1103 1044 1189 1234 1266 1425 2400 1143 1168 1227 13671000 583 163 707 Rpm Bhp Watts 900 554 134 6811100 612 195 735 9191300 674 276 Rpm Bhp Watts 1200 643 233 762 3441400 706 324 1500 738 3791600 757 343 866 455 962 580 Rpm Bhp Watts 1500 724 295 837 402 937 524 1028 660719 1700 790 398 894 514 988 6431474 1797 1700 External Sttic Pressure in. wg1490 1873 1800 1508 1957 19002500 1069 1084 1149 1239 1223 1403 1293 1576 2400 1033 970 1115 1120 1192 1279 1264 1448Rpm Bhp Watts 1500 1188 970 1261 1143 1600 1208 1033 12792500 1061 1053 1148 1233 1226 1416 1297 1604 2400 1026 945 1115 1118 1195 1295 1268 14762600 1097 1169 1181 1356 1257 1546 2700 1132 1294 1214 1487 1289 1684Refrigerant Service Ports Internal WiringUnit Preparation Return-Air FiltersHeating Safety ReliefVentilation Continuous Fan Operating Sequence Cooling Units Without EconomizerRoutine 3 OAT DX Cooling Temperature Control ExampleHumidi-MiZer Normal Design Cooling Operation Subcooling ModeEvaporator Coil CleaningCondenser Coil One-Row CoilCondenser-Fan Adjustment Evaporator Fan Belt AdjustmentFan Motor Bearings Condensate DrainLow Charge Cooling Cooling Charging Chart Standard 50HJ005Cooling Charging Chart Standard 50HJ007 50HE,HJ C06145 Unit Troubleshooting Replacement PartsEconomi$er IV Troubleshooting DCV Demand Controlled Ventilation and Power ExhaustEconomi$er IV Troubleshooting Completion DCV Minimum and Maximum PositionSupply-Air Input Cooling Service Analysis EconoMi$er IV Input/Output Logic Subcooling Mode Liquid ReheatEconoMi$er IV Functional View START-UP Checklist