User`s manual

SYMPTOM
Compressor and condenser fan
will not start=
Compressor will not
start but condenser
fan runs.
Table 16--Troubleshooting Guide--Cooling
CAUSE
Power Failure
Fuse blown or circuit breaker tripped
Defective thermostat, contactor, transformer, or control relay
Insufficient line voltage
Incorrect or faulty wiring
Thermostat setting too high
Faulty wiring or loose connections in compressor circuit
Compressor motor burned out, seized, or internal
overload open
Defective run/start capadtor, overload, start relay
One leg of 3-phase power dead
Three-phase scroll compressor
(48GS048 and 48GX030=060 only}
makes excessive noise, and there may Scroll compressor is rotating in the wrong direction
be a low pressure differential.
Compressor cycles (other than
normally satisfying thermostat).
Compressor operates continuously.
Excessive head pressure,
Head pressure tOO lOW,
Excessive suction pressure,
Suction pressure too low=
Refrigerant overcharge or undercharge
Defective compressor
Insufficient line voltage
Blocked condenser
Defective run/start capacitor, ovedoad or start relay
Defective thermostat
Faulty condenser-fan motor or capacitor
Restriction in refrigerant system
Dirty air filter
Unit undersized for load
Thermostat set too low
Low reMgerant charge
Leaking valves in compressor
Air in system
Condenser soil dirty or restricted
Dirty air filter
Dirty condenser coil
Refrigerant overcharged
Air in system
Condenser air restricted or air short-cycling
Low refrigerant charge
Compressor valves leaking
Restriction in Hquid tube
High heat load
Compressor valves leaking
RsMgerant overcharged
Dirty air filter
Low refrigerant charge
Metering device or low side restricted
Insufficient evaporator airflow
Temperature too low in conditioned area
Outdoor ambient below 40°F
Field-installed filter-drier restricted
REMEDY
Call power company
Replace fuse or reset circuit breaker
Replace component
Determine cause and correct
Check wiring diagram and rewire correctly
Lower thermostat setting below room temperature.
Check wiring and repair or replace.
Determine cause
Replace compressor.
Determine cause and replace.
Replace fuse or reset circuit breaker
Determine cause.
Correct the direction of rotation by reversing the
3-phase power leads to the unit Shut down unit
to allow pressures to equalize.
Recover refrigerant, evacuate system, and recharge to
capacities shown on nameplate
Replace and determine cause
Determine cause and correct
Determine cause and correct
Determine cause and replace.
Replace thermostat.
Replace.
Locate restriction and remove
Replace filter.
Decrease load or increase unit size
Reset thermostat
Locate leak, repair, and recharge
Replace compressor.
Recover refrigerant, evacuate system, and recharge
Clean coil or remove restriction.
Replace filter.
Clean coil.
Recover excess refrigerant
Recover refrigerant, evacuate system, and recharge
Determine cause and correct
Check for leaks, repair, and recharge.
Replace compressor.
Remove restriction.
Check for source and eliminate.
Replace compressor.
Recover excess refrigerant
Replace Filter.
Check for leaks, repair, and recharge.
Remove source of restriction.
increase air quantity Check filter -- replace if necessary
Reset thermostat
install low-ambient kit.
Replace.
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