8-6
Refrigeration Diagnosis
Diagnosis
CRR-20 & CRR-40, September 1999
Condition
Possible Cause
Remedy
Load temperature too high
Compressor does not operate
See “Mechanical Diagnosis”
(unit not cooling)
Shortage of refrigerant
Repair leak and recharge
Overcharge of refrigerant
Purge system
Air in refrigeration system
Evacuate and recharge
Controller out of calibration or
Recalibrate or replace controller
defective
(see Diagnosis Manual for Thermoguard
µ
P-D Microprocessor Controller, TK 41230)
Controller setpoint too high
Adjust controller setpoint
Too much compressor oil in system
Remove compressor oil from compressor
Iced or dirty evaporator coil
Defrost or clean evaporator coil
Restricted lines on high side
Clear restriction
Plugged dehydrator or in-line filter
Change dehydrator or in-line filter
Compressor inefficient
Perform compressor efficiency test. Check
valves and pistons
Evaporator pressure regulator (KVQ)
Repair or replace valve
valve stuck closed or defective
Condenser coil dirty or airflow
Clean condenser coil, clear restriction, or
restricted
repair or replace fan motor or condenser fan
blade
Defective condenser fan pressure
Replace switch
switch
Defective water pressure switch
Replace switch
(Option)
Insufficient water flow rate or
Correct water flow rate or clean/replace
plugged water-cooled
condenser-receiver tank
condenser-receiver tank (option)
Expansion valve open too much
Adjust or replace valve
Expansion valve power element lost
Replace power element
its charge
Expansion valve feeler bulb
Correct feeler bulb installation
improperly mounted, poorly insulated
or making poor contact
Содержание CRR-20
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