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CRR-20 & CRR-40, September 1999
Diagnosis
Mechanical Diagnosis
8-3
Condition
Possible Cause
Remedy
Noisy unit
Insufficient compressor oil
Add oil to proper level
Loose mounting bolts
Tighten mounting bolts
Oil slugging or refrigerant flooding
Add oil or refrigerant charge. Check
back
expansion valve adjustment
Worn fan motor bearings
Replace bearings or motor
Faulty compressor
Repair or replace compressor
Condenser fan motor does
Unit in Null, Heat or Defrost
Check indicator lights. If unit is in
not operate
Null, Heat or Defrost, unit operation is
normal (no remedy required)
Unit on water-cooled condensing
If condenser-receiver tank has water
operation (Option)
pressure, unit operation is normal
Unit in Cool or Modulation
Check indicator lights and discharge pres-
sure. If condenser head pressure is below
1100 +/- 50 kPa, 11.0 +/- 0.5 bar, 160 +/- 7
psig, unit operation is normal (no remedy
required)
Defective condenser fan pressure
Replace defective switch
switch or water pressure switch
(option)
Loose line connection
Tighten connections
Open motor internal thermal
Check for seized bearings or defective
overload protector
thermal overload protector. Repair or
replace as necessary
Defective motor
Replace motor
Defective high speed condenser fan
Replace defective contactor
contactor
No high speed condenser fan output
Diagnose and replace output module or
signal from controller
controller. Disconnect water supply to unit
(option) and check water pressure switch
(option) before replacing controller
Содержание CRR-20
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