Kold-Draft GT350 Service Manual

SEQUENTIAL CIRCUIT DIAGRAM – GT350 MODELS

Diagram #1 Water Fill

Bin thermostat closed; Switch in “ice” position; Contactor closed; Water plate closed (pump & defrost switch up)

Liquid level control is low, actuator thermostat warm—power to the water valve. Pump and defrost switch up (water plate closed)—power to the
water pump.

SEQUENTIAL CIRCUIT DIAGRAM – GT350 MODELS

Diagram #2 Water Fill Complete—Evaporator Temperature Above 26°F.)

Bin thermostat closed; Switch in “ice” position; Contactor closed; Water plate closed (pump & defrost switch up)

Liquid level control high—power off to the water valve. Pump and defrost switch up (water plate closed)—power to the water pump. Actuator
thermostat is warm.

SEQUENTIAL CIRCUIT DIAGRAM – GT350 MODELS

Diagram #3 Ice Forming—Evaporator Temperature Below 26°F.)

Bin thermostat closed; Switch in “ice” position; Contactor closed; Water plate closed (pump & defrost switch up)

Liquid level control high—power off to the water valve. Pump and defrost switch up (water plate closed)—power to the water pump. Actuator
thermostat switches cold.

SEQUENTIAL CIRCUIT DIAGRAM – GT350 MODELS

Diagram #4 Defrost- Start of Defrost

Bin thermostat closed; Switch in “ice” position; Contactor closed; Water plate closed (pump & defrost switch up)

Liquid level control switches to low—triggers defrost. Actuator switch up—power to water valve. Actuator thermostat cold—power to defrost valve,
power to actuator motor (motor turns CCW). Pump and defrost switch up (water plate closed)—power to water pump.