Carrier 50ZHA024-060 Installation & Service Instructions Manual page 18

Check Valves
A Open
B Closed
C Open
D Closed
LEGEND
LCS Loss of Charge Switch
Acutrol Metering Device
Check Valve (Arrow indicates direction of flow)
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.
Fig. 14—Typical Heat Pump Operation, Heating Mode
Check Valves
A
Closed
B
Open
C
Closed
D
Open
LEGEND
LCS Loss of Charge Switch
Acutrol Metering Device
Check Valve (Arrow indicates direction of flow)
1. Hot gas from compressor flows through the 4-way valve and is
directed to the heating liquid line check valve. It is then con-
densed and subcooled through converging circuits. Refrigerant leaves
the outdoor coil by way of the strainer and the check valve in the
cooling liquid line.
2. The refrigerant then feeds the indoor coil through the Acutrol
metering device on each circuit.
Fig. 15—Typical Heat Pump Operation, Cooling Mode
OUTDOOR COIL
B
A
LCS
C
HEATING CYCLE
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.
OUTDOOR COIL
B
A
LCS
C
COOLING CYCLE
3. Each circuit evaporates the refrigerant and the circuits are com-
bined in the indoor coil 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.
18
INDOOR COIL
D
STRAINER
INDOOR COIL
D
STRAINER
C95045
C95044