Carrier 50HS018 Installation, Start-Up And Service Instructions Manual page 27

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)
*No outdoor coil check valve on 50HS048.
1. Hot gas from compressor flows through the 4-way valve and is
directed to the indoor coil. It is then condensed 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.
OUTDOOR COIL
A
*
HEATING CYCLE
Fig. 29 — Typical Heat Pump Operation, Heating Mode
B
LCS
STRAINER
C
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.
27
INDOOR COIL
D