Service Manual

Column Refrigeration Service Manual
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14
3.1 Refrigeration System (cont.)
Table 3.1. Refrigeration System Diagnostics/Troubleshooting
PROBLEM CAUSE SOLUTION
Not Cooling (cont.) Inverter
Loose Connection Check Connections
Power Ensure 120 power to inverter continuously
Signal Circuit Power Ensure Signal Circuit has power
Compressor
Open Windings Check continuity between pins
Locked Rotor Verify locked rotor
Internal Damage Verify Amperage
Refrigerant
Leak
See Section 6.11.
Refrigerant Circuit
Restriction Replace Refrigeration Module
Hot Gas Bypass Valve
Internal Leak Check Valve
Damper
Obstructed Remove Obstruction
Power Determine if damper is getting power
Defective Replace
Thermistors
Loose Connection Verify Continuity
Defective VerifyComponentSpecications
Temp/Humidity Sensor
Defective VerifyComponentSpecications
Loose Connection Verify Continuity
Control Board
Loose Connection Verify Continuity
Defective VerifyComponentSpecications
User Interface
Loose Connection Verify Continuity
Defective VerifyComponentSpecications