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
8-1-2. Cooling
Identical to operation for a typical ductless split air conditioner (heat pump).
● Indoor Unit | ● Outdoor Unit |
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| Exhaust chimney | |
| Outdoor heat exchanger |
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Room temperature sensor |
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| Refrigerant |
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| Heater |
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| Capillary tube | Outdoor fan |
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| outdoor fan motor |
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Fan | Check valve 1 | Thermistor 2 |
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| Bimetal | |
Indoor |
| V1 (ON/OFF valve) |
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| thermostat | ||
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heat |
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| V2 (ON/OFF valve) |
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exchanger |
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| Thermal | |
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| fuse |
Narrow tube |
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| Thermistor 1 | Check |
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Wide tube |
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| valve 2 |
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| Reversing |
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| valve |
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| Accumulator |
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| Combustion | Combustion | |
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| blower fan | |
| Compressor |
| blower motor | |
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Coil temperature sensor
Gas inlet
Manual
Solenoid valve 1
Solenoid valve 2
Proportional control valve
CoolingHeating
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