Component Function and Testing
Motor, | Condenser fan moves cooling air across condenser coil | Check resistance across coil. | |||||||||
condenser psc | and compressor body. |
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| The condenser motor is in a parallel circuit w ith the |
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| compressor. |
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Motor, ecm | Evaporator motor moves air across evaporator | Check resistance from ground connector solder. Trace to motor frame | |||||||||
evaporator fan | coil and throughout refrigerator. | must not exceed .05 ohms. Check pow er at connector to evaporator | |||||||||
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| motor. |
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| Evaporator fan motor is in a parallel circuit w ith |
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| compressor, w ith a delay for w arm coil |
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Motor, | Refrigerator fan circulates cold air into refrigerator | See "Refrigeration and Defrost Component Checks Made at High Voltage | |||||||||
refrigerator fan | compartment. | Board" section for D.C. voltage check at high voltage board. Check for | |||||||||
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| The refrigerator fan motor is in a series circuit w ith the | voltage at motor also. |
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| semi conductor sw itch. |
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Overload | Overload is a temperature and current sensing type. | 1. Disconnect pow er to refrigerator. | |||||||||
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| Overload opens w hen sensing a high current or high | 2. Remove relay cover and pull relay off compressor. |
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| 3. Pull overload protector off compressor common terminal. | |
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| compressor temperature. | 3. With ohmmeter, check resistance betw een 1/4 " male terminal and |
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| female pin receptacle terminal w hich pushes onto compressor common |
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| After overload opens, overload can require up to 2 | terminal. At ambient temperature, overload protector should have less |
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| hours to reset, depending on ambient temperature and | than 1 ohm resistance. An open overload protector w ill have infinite |
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| residual heat load in compressor. | resistance. |
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Relay, PTC | When voltage is connected and PTC is cooled, current | With pow er off check resistance. |
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| passes through PTC to the start w inding. | Across terminals 2 & 3: |
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| Normal = 3 to 12 ohms |
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| After a short time, current w ill have heated the resistor | Shorted = 0 ohms |
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| in PTC and resistance w ill rise. This blocks current | Open = infinite ohms |
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| flow through PTC. |
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| Start w inding remains in the circuit through the run |
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| capacitor. |
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| Solid state relay plugs directly on compressor start and |
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| run terminals. Relay terminals 2 and 3 are connected |
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| w ithin relay. Run capacitor is connected to relay |
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| terminal 3. The L2 side of 120 VAC pow er is |
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| connected to relay terminal 2. |
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Sw itch, |
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keyboard |
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| Switch | Continuity |
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| Functions | Test |
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| Display On | 1 and 3 |
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| Freezer Temp | 3 and 6 |
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| Ref Temp | 3 and 7 |
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| Warmer | 6 and 7 |
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| Colder | 4 and 6 |
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| Vacation | 4 and 7 |
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| Max Ref | 7 and 8 |
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| Max Frz | 4 and 8 |
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| Alarm Off | 4 and 5 |
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| Display Off | 5 and 8 |
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RS1200001 Rev. 1 | 22 | April 1998 |
