Carrier 50HS018 Installation, Start-Up And Service Instructions Manual page 26

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)
*No outdoor coil check valve on 50HS048.
1. Hot gas from compressor flows through the 4-way valve and is
directed to the outdoor coil. It is then condensed 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.
OUTDOOR COIL
A
*
COOLING CYCLE
Fig. 28 — Typical Heat Pump Operation, Cooling Mode
B
LCS
STRAINER
C
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.
26
INDOOR COIL
D