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Table 8 — cooling service analysis chart, Symptom, Remedy – Carrier 48GH User Manual

Page 22

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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.

Book

1

4

Tab

la

la

Form48GH,GL-5SI Supersedes48GH,GL-1 SI

Printed in U.S A

3-82

PC 101

Catalog No 534-820

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