40
→ — Refrigerant Flow Direction
∆ — Check Valve Flow Direction
X—Fixed Orifice
CHECK
VALVE*
COOLING HEATING
A
B
C
D
E
F
Closed
Open
Closed
Open
Closed
Open
Open
Closed
Open
Closed
Open
Closed
NOTES:
1. Hot gas from compressor flows through the 4-way valve and is
directed to the outdoor-coil header. At the header it is con-
densed and subcooled through converging circuits (7-2-1).
Refrigerant leaves the outdoor-coil by way of the check valve
to the liquid line.
2. The refrigerant then flows through the filter drier and feeds the
indoor coil by way of fixed orifice tubes on each circuit.
3. Each circuit evaporates the refrigerant, and the circuits are
combined 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, accumula-
tor and back to the compressor.
NOTES:
1. Hot gas from compressor flows through the 4-way valve and is
directed to the indoor-coil header. At the header it is con-
densed and directed through subcooling circuits and out the
indoor-coil check valve to the liquid line.
2. The refrigerant then flows through a strainer and feeds the
outdoor-coil by way of fixed orifice tubes on each circuit.
3. Each circuit evaporates the refrigerant, and the circuits are
combined in the outdoor-coil header with some of the circuits
flowing through the check valve.
4. The refrigerant then flows through the 4-way valve, accumula-
tor and back to the compressor.
*See Table 18 for check valve operation details.
NOTE: Circuitry shown is for single system; 50HJQ016 units have 2 individual and independent
refrigeration systems that each operate in an identical manner.
Fig. 53 — Typical Heat Pump Operation
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