Carrier 48HJD005-007 specifications Cooling Service Analysis, Compressor operates continuously

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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,

Replace component.

 

or 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 com-

Check wiring and repair or replace.

but condenser fan runs.

pressor circuit.

 

 

Compressor motor burned out, seized, or

Determine cause. Replace compressor.

 

internal 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

normally satisfying thermostat).

 

recharge 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

Determine cause and replace.

 

start 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

 

 

necessary.

 

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.

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Contents Step 1 - Provide Unit Support CONTENTSSAFETY CONSIDERATIONS INSTALLATION1′-4″ Fig. 1 - Roof Curb DetailsFig. 3 - Condensate Drain Pan Fig. 2 - Unit Leveling TolerancesStep 7 - Make Electrical Connections Table 1 - Physical Data Table 1 - Physical Data cont 1/2″ Fig. 5 - Base Unit Dimensions - 48HJ004-0073/4″ Fig. 6 - Flue Hood Details Step 8 - Adjust Factory-Installed OptionsFig. 7 - Gas Piping Guide With Accessory Thru-the-Curb Service ConnectionsFig. 10 - Field Control Wiring Raceway Fig. 8 - Power Wiring ConnectionsFig. 9 - Low-Voltage Connections With or Without Economizer age is greater than 2%. Use the following formula to determine Never operate a motor where a phase imbalance in supply voltthe percent of voltage imbalance Table 2C - 48HJ High-Static Motor Units Without Electrical Convenience Outlet 208/230-V Unit Shown Fig. 11 - Accessory Field-Installed HumidistatFig. 14 - Outdoor-Air Hood Details Fig. 13 - Typical Access Panel LocationsFig. 15 - Durablade Economizer Installed in Unit Fig. 16 - Horizontal Durablade Economizer InstallationFig. 20 - Outdoor-Air Thermostat Enthalpy Control Installation Wiring HarnessFig. 19A - Durablade Economizer Damper Minimum Position Setting Fig. 19B - Durablade Economizer Minimum Position Damper SettingFig. 22 - Durablade Economizer Barometric Relief Damper CharacteristicsFig. 24 - Typical Access Panel Locations Fig. 25 - Exhaust Air Hood AssemblyFig. 29 - EconoMi$er Installed Fig. 28 - Rear EconoMi$er Flange InstallationFig. 26 - Outdoor-Air Hood Assembly Fig. 27 - Completed Hood AssemblyPOWER EXHAUST SYSTEM HIGH VOLTAGE Fig. 31 - EconoMi$er Sensor WiringFig. 33 - Typical Access Panel Locations Fig. 32 - Wiring Diagram for Power Exhaust SystemPotentiometers Factory Settings Fig. 34 - Supply-Air Sensor PlacementTable 4 - Default Potentiometer Settings Fig. 35 - EconoMi$er Control AdjustmentFig. 38 - Evaporator-Fan Pulley Adjustment Step 9 - Adjust Evaporator-Fan Speed - AdFig. 37 - Belt-Drive Motor Mounting Table 6 - Evaporator-Fan Motor Data - Standard Motor Table 5A - 48HJ Fan Rpm at Motor Pulley Setting With Standard MotorTable 7 - Evaporator-Fan Motor Data - High-Static Motors Table 9 - Outdoor Sound Power Total Unit Table 8 - Motor Nominal HorsepowerBels Table 12 - 48HJ005 Fan Performance - Vertical Discharge Units With Standard Motor 3-Phase Units Single-Phase UnitsTable 16 - 48HJ007 Fan Performance - Vertical Discharge Units With Standard Motor Table 18 - 48HJ004 Fan Performance - Horizontal Discharge Units With Standard Motor Table 20 - 48HJ005 Fan Performance - Horizontal Discharge Units With Standard Motor 3-Phase Units Package Static Pressure Drop in. wg FIOP - Factory-Installed OptionTable 26 - Economizer Static Pressure Drop in. wg Table 27 - FIOP MoistureMiser DehumidificationSTART-UP PRE-START-UPOperating Sequence HeatingTable 28 - Altitude Compensation When the supply-air temperature falls between 57 F and Fig. 39 - MoistureMiser Option Operation Fig. 42 - Separating Coil Sections SERVICELubrication Fig. 40 - Cleaning Condenser Coil Fig. 41 - Propping Up Top PanelFig. 44 - Cooling Charging Chart Standard 48HJ004 Fig. 43 - Condenser-Fan AdjustmentFig. 45 - Cooling Charging Chart Standard 48HJ005 Fig. 47 - Cooling Charging Chart Standard 48HJ007 Fig. 46 - Cooling Charging Chart Standard 48HJ006Fig. 48 - Cooling Charging Chart, 48HJ004 with Optional MoistureMiser Dehumidification Package Fig. 52 - Burner Section Details Fig. 53 - Burner Tray Details Table 29 - LED Error Code Description48HJF005-007 - 150,000 BTUH INPUT Fig. 54 - Spark Gap AdjustmentLOW HEAT 48HJE004, 48HJD005-007 - 72,000 BTUH INPUT MEDIUM AND HIGH HEAT 48HJE005-007, 48HJF004 - 115,000 BTUH INPUTTable 30 - LED Error Code Service Analysis TROUBLESHOOTINGTable 32 - Durablade Economizer Service Analysis Table 31 - Heating Service AnalysisTable 33 - EconoMi$er Flash Code Identification Table 34 - EconoMi$er TroubleshootingCritical Table 35 - MoistureMiser Dehumidification Subcooler Service Analysis Compressor operates continuously Table 36 - Cooling Service Analysis208/230 3-Phase Unit Shown Fig. 55 - Typical Wiring Schematic and Component ArrangementNOTES FOR FIG LEGEND AND NOTES FOR FIGReplaces 48HJ-17SI Page III. START-UP START-UP CHECKLIST Remove and Store in Job FileI. PRELIMINARY INFORMATION II. PRE-START-UP insert checkmark in box as each item is completed
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