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• When the coil warms to approximately 55°F, the defrost termination thermostat closes and energizes the switching
solenoid in the timer. At this time, switch 1 to 3 in the timer opens, terminating the defrost heaters. Simultaneously,
switch 2 to 4 closes in the time clock, energizing the temperature control circuit.
• Suction pressure rises, the low pressure control closes, and the compressor starts.
• The fan relay closes when the coil temperature reaches approximately 30°F. This energizes the fan motors.
• The system operates in the refrigeration cycle until another defrost cycle is initiated by the timer.
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