Service Manual

Column Refrigeration Service Manual
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16
3.1 Refrigeration System (cont.)
Table 3.1. Refrigeration System Diagnostics/Troubleshooting
PROBLEM CAUSE SOLUTION
Compartment Not
Holding Temperature
Check Setpoints
Incorrect Setpoint Adjust Setpoint
Thermistors
Loose Connection Verify Continuity
Defective VerifyComponentSpecications
Temp/Humidity Sensor
Defective VerifyComponentSpecications
Loose Connection Verify Continuity
Damper
Obstructed Remove Obstruction
Power Determine if damper is getting power
Defective Replace
Obstructed Airow
Checkairowinletandoutlet
for obstructions
Remove Obstruction
PROBLEM CAUSE SOLUTION
Noisy Operation Airow Noise
Condenser Fan Motors Airownoisefromthecondenserfans
is normal
Evaporator Fan Motors Airownoisefromtheevaporatorfans
is normal
Clicking/Crackling During Defrost
Solenoid Valve Normal during defrost
Frost/Ice Melting Normal during defrost
Metallic Noises
Tubes Isolate the tubes from surroundings
Sheet metal vibration Isolate the parts to prevent vibration
Compressor Noise
Normal Operation Some noise is normal from a
refrigeration compressor