Standard Frost-Free
Double Door Refrigerator Non-Inverter Course
Comprehensive training on electromechanical defrost systems: defrost timers, bi-metal thermostats, glass tube heaters, PTC starting relays, and drain de-icing.
Key Course Content
- • Defrost timer operation: 8-hour run vs 21-minute defrost cycle wiring
- • Bi-metal defrost thermostat continuity testing under freezing temperatures
- • Glass radiant and aluminum foil defrost heaters testing
- • Thermal fuse safety cutoffs and evaporator fan motor circuits
- • Evaporator drainage tray blockage clearing and de-icing
Practical Laboratory Drills
- • Manual timer advance switching with insulated hand tools
- • Compressor starting testing: PTC relay vs Current Coil Relay with OLP
- • Locating internal pinhole leaks on aluminum evaporator tubes
- • Nitrogen flushing, vacuuming, and charging R134a/R600a systems
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