Carrier 50ZHA024-060 TypicalHeat Pump Operation, Heating Mode, Check Valves, Heating Cycle

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

B

LCS

STRAINER

D

STRAINER

C

HEATING CYCLE

1.	Hot gas from compressor flows through the 4-way valve and is	3.	Each circuit evaporates the refrigerant and the circuits are com-
	directed to the cooling liquid line check valve. It is then condensed		bined in the outdoor header with some of the circuits flowing through
	and directed through subcooling circuits and out to the strainer		the check valve.
	and the check valve in the heating liquid line.	4.	The refrigerant then flows through the 4-way valve, accumulator,
2.	The refrigerant then feeds the outdoor coil through the Acutrol		and back to the compressor.
	metering device on each circuit.

Fig. 14—Typical Heat Pump Operation, Heating Mode

C95045

OUTDOOR COIL

ACCUMULATOR	COMPRESSOR
	A

Check Valves

AClosed

BOpen

CClosed

DOpen

LEGEND

LCS Loss of Charge Switch

Acutrol Metering Device

Check Valve (Arrow indicates direction of flow)

INDOOR COIL

B

LCS

STRAINER

D

STRAINER

C

COOLING CYCLE

1.	Hot gas from compressor flows through the 4-way valve and is	3.	Each circuit evaporates the refrigerant and the circuits are com-
	directed to the heating liquid line check valve. It is then con-		bined in the indoor coil header with some of the circuits flowing
	densed and subcooled through converging circuits. Refrigerant leaves		through the check valve.
	the outdoor coil by way of the strainer and the check valve in the	4.	The refrigerant then flows through the 4-way valve, accumulator,
	cooling liquid line.		and back to the compressor.
2.	The refrigerant then feeds the indoor coil through the Acutrol
	metering device on each circuit.

Fig. 15—Typical Heat Pump Operation, Cooling Mode

C95044

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