8. FUNCTION

8-1. Motion Explanation

8-1-1. Heating

Heating operation begins with the refrigerant pump down cycle to move refrigerant into the heating circuit of the system. Simultaneously, gas burner ignition is initiated for a period of about 1 minute.

When the refrigerant transport period is completed, refrigerant is contained within the heating circuit tubing and retained there by the 2 check valves. The refrigerant pump down circuit condition is established by the reversing valve set to the heating position and the ON/OFF valve, V1, is closed.

Upon completion of the pump down phase, the ON/OFF valve is opened for normal heating operation.

Cooling heat transfer tubing in the outdoor section is blocked from refrigerant flow by check valves during the heating cycle.

Heating circuit refrigerant tubing is in contact with the exterior wall of the aluminum heat exchanger above the gas burner. Heated refrigerant is circulated from the outdoor heat exchanger tubing to the indoor heat transfer tubing by operation of the compressor. Controls maintain refrigerant temperature to a point above the saturation temper- ature and so the temperature is circulated as a gas.

Refrigerant flow is through the ON/OFF valve, V2, under stable conditions to provide for low power operation. Low power operation is initiated (V2 opens) when thermistor-1 senses the temperature of equalization at 263 psig (18.5 kg/cm2).

8-1-2. Cooling

Identical to operation for a typical ductless split air conditioner (heat pump).

Indoor Unit

Outdoor Unit

 

 

 

 

 

Exhaust chimney

 

Outdoor heat exchanger

 

 

Room temperature sensor

 

 

Refrigerant

 

 

 

Heater

 

 

 

 

 

 

Capillary tube

Outdoor fan

 

 

 

 

outdoor fan motor

 

 

Fan

Check valve 1

Thermistor 2

 

 

 

 

 

Bimetal

Indoor

 

V1 (ON/OFF valve)

 

 

 

thermostat

 

 

 

heat

 

 

 

 

V2 (ON/OFF valve)

 

 

exchanger

 

 

Thermal

 

 

 

 

fuse

Narrow tube

 

 

 

 

 

Thermistor 1

Check

 

 

Wide tube

 

 

 

 

valve 2

 

 

 

 

 

 

 

Reversing

 

 

 

 

valve

 

 

 

 

 

Accumulator

 

Inter-unit cable

 

 

Combustion

Combustion

 

 

 

blower fan

 

Compressor

 

blower motor

 

 

 

Coil temperature sensor

Gas inlet

Manual shut-off valve

Solenoid valve 1

Solenoid valve 2

Proportional control valve

CoolingHeating

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Sanyo KGS1411, CG1411 service manual Function, Motion Explanation, Heating, Cooling

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