Carrier 48TJD008-014, 48TJE008-014, 48TJF008-012 Cooling Service Troubleshooting

Page 34

Table 20 Ð Cooling Service Troubleshooting

PROBLEM

CAUSE

REMEDY

Compressor and

Power failure.

Call power company.

condenser fan

Fuse blown or circuit breaker tripped.

Replace fuse or reset circuit breaker.

will not start.

Defective thermostat, contactor, transformer, or control

Replace component.

 

 

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 compressor circuit.

Check wiring and repair or replace.

but condenser fan runs.

 

 

Compressor motor burned out, seized, or internal

Determine cause. Replace compressor.

 

overload open.

 

 

Defective run/start capacitor, overload, or start relay.

Determine cause and replace.

 

One leg of 3-phase power dead.

Replace fuse or reset circuit breaker.

 

 

Determine cause.

Compressor cycles

Refrigerant overcharge or undercharge.

Recover refrigerant, evacuate system, and recharge

(other than normally

 

to nameplate.

satisfying thermostat).

 

 

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 relay.

Determine cause and replace.

 

Defective thermostat.

Replace thermostat.

 

Faulty condenser-fan motor or capacitor.

Replace.

 

Restriction in refrigerant system.

Locate restriction and remove.

Compressor makes

Compressor rotating in wrong direction.

Reverse the 3-phase power leads as described

excessive noise

 

on page 23.

(48TJ014 scroll only)

 

 

Compressor operates

Dirty air ®lter.

Replace ®lter.

continuously.

 

 

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 ®lter.

Replace ®lter.

 

Dirty condenser coil.

Clean coil.

 

Refrigerant overcharged.

Remove 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

High heat load.

Check for source and eliminate.

pressure.

 

 

Compressor valves leaking.

Replace compressor.

 

 

Refrigerant overcharged.

Recover excess refrigerant.

Suction pressure too low.

Dirty air ®lter.

Replace ®lter.

 

Low refrigerant charge.

Check for leaks, repair, and recharge.

 

Metering device or low side restricted.

Remove source of restriction.

 

Insufficient evaporator air¯ow.

Increase air quantity. Check ®lter and replace if

 

 

necessary.

 

Temperature too low in conditioned area.

Reset thermostat.

 

Field-installed ®lter drier restricted.

Replace.

Compressor no. 2

Unit in economizer mode.

Proper operation; no remedy necessary.

will not run.

 

 

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Contents Installation, Start-Up Service Instructions Install External Trap for Condensate Horizontal Conversion PanelsUnit Size Power Control Connector``D ALT Drain Hole Accessory GAS Connection PackageUnit Leveling Tolerances Physical Data OUTDOOR-AIR Inlet Screens Furnace SectionFreeze Protection Thermostat F² RETURN-AIR FiltersBase Unit Dimensions Make Electrical Connections Flue Hood DetailsElectrical Data Comps IFCAdjust Factory-Installed Options Typical UnitPosition Setting Durablade Economizer Installed in Unit Durablade Economizer Damper Minimum Position Setting Parablade Economizer Installed in Unit Enthalpy Settings for Parablade Economizer Unit Motor Pulley Turns Open Economizer Static Pressure Drop in. wg Evaporator-Fan Motor EfficiencyMotor Data Fan Performance, 48TJ009 Ð Vertical Discharge Units Fan Performance, 48TJ008 Ð Vertical Discharge UnitsAirflow Fan Performance, 48TJ012 Ð Vertical Discharge Units Fan Performance, 48TJ014 Ð Vertical Discharge UnitsFan Performance, 48TJ008 Ð Horizontal Discharge Units Fan Performance, 48TJ009 Ð Horizontal Discharge UnitsFan Performance, 48TJ012 Ð Horizontal Discharge Units Fan Performance, 48TJ014 Ð Horizontal Discharge UnitsSTART-UP HeatingNominal Input Altitude CompensationElevation Cleaning Condenser Coil Lubrication48TJ Unit Voltage Condenser-Fan Adjustment FigFAN Height ``A Cooling Charging Chart 48TJ009 OFF LED Error Code DescriptionLED Indication Error Code Description Flash²Burner Section Details Spark Gap Adjustment Problem Cause Remedy LED Error Code Service AnalysisLED OFF Durablade Economizer Troubleshooting Problem Cause RemedyParablade Economizer Service Troubleshooting Cooling Service Troubleshooting Heating Service Troubleshooting Typical Wiring Schematic and Component Arrangement Page Copyright 1996 Carrier Corporation Page Remove and Store in Job File Preliminary Information

48TJF008-012, 48TJD008-014, 48TJE008-014 specifications

Carrier's 48TJD008-014, 48TJE008-014, and 48TJF008-012 series are high-performance packaged rooftop units engineered to meet the heating, ventilation, and air conditioning (HVAC) needs of commercial and industrial applications. These units are renowned for their reliability, energy efficiency, and advanced technologies, making them a popular choice among facility managers and HVAC professionals.

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In summary, Carrier's 48TJD008-014, 48TJE008-014, and 48TJF008-012 rooftop units are engineered for efficiency, reliability, and comfort. With their durable construction, advanced compressor technology, energy efficiency, comfort features, and ease of installation, these units are ideal for meeting the demanding HVAC needs of commercial spaces.
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