20
STRAINER
ACCUMULA
TO
R
COMPRESSOR
STRAINER
LCS
OUTDOOR COIL
INDOOR COIL
A
B
D
C
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)
HEATING CYCLE
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.
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.
C95045
Fig. 20 -- Typical Heat Pump Operation, Heating Mode
STRAINER
ACCUMULA
TO
R
COMPRESSOR
STRAINER
LCS
OUTDOOR COIL
INDOOR COIL
A
B
D
C
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)
COOLING CYCLE
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.
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.
C95044
Fig. 21 -- Typical Heat Pump Operation, Cooling Mode
664B
Summary of Contents for 664B
Page 4: ...4 A08414 Fig 5 Unit Base Dimensions 664B024 060 664B...
Page 11: ...11 A08209 Fig 13 Typical Single Phase Unit Electrical Diagram Sizes 024 042 664B...
Page 12: ...12 A06405 Fig 14 Typical Single Phase Unit Electrical Diagram Sizes 048 060 664B...
Page 13: ...13 A06325 Fig 15 Typical Three Phase Unit Electrical Diagram Sizes 030 042 664B...
Page 14: ...14 A06326 Fig 16 Typical Three Phase Unit Electrical Diagram Sizes 048 060 664B...
