±Typical Heat Pump Operation, Heating Mode

OUTDOOR COIL

ACCUMULATOR	COMPRESSOR
	A

Check Valves

AOpen

BClosed

COpen

DClosed

LEGEND

LCS Loss of Charge Switch

Acutrol Metering Device

Check Valve (Arrow indicates direction of flow)

INDOOR COIL

LCS

STRAINER

HEATING CYCLE

1.Hot gas from compressor flows through the 4-way valve and is directed to the cooling liquid line check valve. It is then condensed and directed through subcooling circuits and out to the strainer and the check valve in the heating liquid line.

2.The refrigerant then feeds the outdoor coil through the Acutrol metering device on each circuit.

3.Each circuit evaporates the refrigerant and the circuits are com- bined in the outdoor header with some of the circuits flowing through the check valve.

4.The refrigerant then flows through the 4-way valve, accumulator, and back to the compressor.

C95045

Fig. 23±Typical Heat Pump Operation, Heating Mode

Check valves are also located in the liquid lines near the strainers.

The Strainers are the larger of the two components.

Step 12ÐHigh Flow Valves

Located on the compressor hot gas and suction tubes are High Flow Valves. Large black plastic caps distinguish these valves with O-rings located inside the caps. These valves can not be accessed for service in the field. Ensure the plastic caps are in place and tight or the possibility of refrigerant leakage could occur.