Check
Valves
A
Open
B
Closed
OUTDOOR COIL
L
f
LCS
C
Open
D
Closed
LEGEND
LCS
Loss of Charge
Switch
D
Acutrol
Metering
Device
]
Check Valve
indicates
direction
of
(Arrow
flow)
HEATING
CYCLE
1. Hot gas from compressor
flows through
the 4-way valve
and is
directed to the cooling liquid line check valve, tt 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
coi! through
the Acutrol
metering
device
on each circuit.
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.
Fig. 20 - Typical
Heat
Pump Operation,
Heating
Mode
C95045
Check
Valves
A
Closed
B
Open
OUTDOOR COIL
INDOOR COIL
LOS
C
Closed
D
Open
LEGEND
LCS
Loss of Charge
Switch
]
Acutrol
Metering
Device
]
Check Valve (Arrow
indicates
direction
of flow)
COOLING CYCLE
1. Hot gas from compressor
flows through the 4-way valve
and is
directed
to the heating
liquid
line check valve,
tt is then con-
densed and subcooted 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
coi! through
the Acutrol
metering
device
on each circuit.
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.
Fig. 21 - Typical
Heat Pump Operation,
Cooling
Mode
20
C95044