Carrier 60 Installation And Service Instructions Manual page 39

SYMPTOMS
Compressor Leak in system
loses oil
Mechanical damage (blown piston or broken
discharge valve)
Oil trapped in line
Crankcase heater not energized
during shutdown
Hot liquid line Shortage of refrigerant due to leak
Frosted liquid line Shutoff valve partially closed or restricted
Restricted filter drier
Frosted suction line Expansion valve admitting excess refrigerant
Compressor will Burned-out coil
not unload
Defective capacity control valve
Miswired solenoid
Weak, broken, or wrong valve body spring
Compressor will Miswired solenoid
not load
Defective capacity control valve
Plugged strainer (high side)
Stuck or damaged unloader piston or piston ring(s)
System noises Piping vibration
Expansion valve hissing
Compressor noisy
Freeze-up Improper charging
Improperly set safety thermostat
Operating with safety thermostat bypassed
Improper circulation of condenser water
System not drained for winter shutdown
Loose Thermistor
Table 14 — Troubleshooting (cont)
CAUSE
39
REMEDY
Repair leak.
Repair damage or replace compressor as needed.
Check piping for oil traps.
Check wiring and crankcase heater contacts on the
temperature controller, and replace heater if necessary.
Repair leak and recharge.
Open valve or remove restriction.
Replace filter drier.
Adjust expansion valve. Replace valve if defective.
Replace coil.
Replace valve.
Rewire correctly.
Replace spring.
Rewire correctly.
Replace valve.
Clean or replace strainer.
Clean or replace the necessary parts.
Support piping as required.
Check for loose pipe connectors.
Add refrigerant.
Check for plugged liquid line strainer.
Check valve plates for valve noise.
Replace compressor (worn bearings).
Check for loose compressor holddown bolts.
Make sure a full quantity of fluid is flowing through the
cooler while charging, and suction pressure in cooler is
equal to or greater than pressure corresponding to 32 F
(0° C) (58 psig [400 kPa] for Refrigerant 22).
Check safety thermostat for proper setting at beginning of
each season.
If thermostat was bypassed for checking, be sure it is back
in circuit before starting unit.
Use adequately sized cleanable strainer in the condenser
water circuit. Make sure strainer is clean. It may sometimes
be necessary to chemically treat the water to prevent for-
mation of deposits.
Remove drain plugs at end of cooling season. Blow out any
residual water. Instead of draining, a suitable anti-freeze
may be added to the water. Damage to chiller due to freez-
ing is considered abuse and is not covered by warranty.
Tighten thermistor to pipe and reinsulate (30HW).