Carrier 48GH - Manual (Page 22)

Table 8 — Cooling Service Analysis Chart
SYMPTOM
Compressor and
Condenser Fan Will
IMot Start
Compressor Will Not Start
But Condenser Fan Runs
Compressor Cycles (other
than normally satisfying
thermostat)
Compressor Operates
Continuously
Excessive Head Pressure
Head Pressure Too Low
Excessive Suction
Pressure
Suction Pressure Too Low
CAUSE
Power failure
Fuse blown or circuit breaker
tripped
Defective thermostat, contactor,
tran^rmer, 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 capacitor,
^verload^ startjelay__
One leg of three-phase power dead
Refrigerant overcharge or
undercharge
Defective compressor
Insufficient line voltage
Blocked condenser
Defective run/start capacitor,
overload, 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 refrigerant charge
Leaking valves in compressor
Air in system
Ccmc^nser coil 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 liquid tube
JHigh heat load '
Compressor valves leaking
Refrigerant overcharged
Dirty air filter
Low refrigerant charge
Metering device or low-side
restricted
Insufficient evaporator airflow
Temperature too low in
conditioned area
Outdoor ambient temperature
beloyy^ 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.
Blow refrigerant, evacuate system, and recharge
to 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
Blow refrigerant, evacuate system, and recharge
Clean coil or remove restriction
Replace filter
Clean coil
Purge excess refrigerant
Blow refrigerant, evacuate system, and recharge
Determine cause and correct
Check for leaks, repair, and recharge
Replace compressor
Remove restriction
Check lor source and eliminate
Replace compressor
Purge excess refrigerant
Replace filter
Check for leaks, repair, and recharge
Remove source of restriction
Increase air quantity Check filter
jf nej^essary
Reset thermostat
replace
Install accessory low-ambient kit
Replace
For replacement items use Carrier Specified Parts
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
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Form48GH,GL-5SI Supersedes48GH,GL-1 SI Printed in U.S A 3-82 PC 101 Catalog No 534-820