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Valve and sensor function and operation
Outdoor unit
Outdoor unit - valve functions
Symbol Name of valve Description of function
20SF 4-way reversing valve OFF: Normal operation.
(4-way valve) Cooling operation ON: Low load condition when sub heat exchanger is
required. Used in combination with SV15.
4-way reversing valve ON: Normal operation.
Heating operation OFF: Defrost operation.
SV1 High-pressure release Heating operation.
solenoid valve Energised when TE >11°C
SV2 Hot gas bypass solenoid Opens when Pd < 13 kgf/cm
2
G (ccoling)
valve (For cooling-dominant mode and sub heat exchanger
operation Pd < 17 kgf/cm
2
G - 3-pipe only).
Opens when outdoor ThO < 0°C
SV4 Solenoid valve for D.O.L. Opens when the D.O.L. compressor starts for
compressor start-up unloading.
SV5 Gas balance Opens when compressor stops.
SV13 Cooling solenoid valve Opens for cooling-only operations.
SV14 Solenoid valve for SV14 opens for heating operation.
expansion valve.
SV15 Sub heat exchanger Opens for sub heat exchanger requirement.
solenoid valve
SV16 Solenoid valve for capillary SV16 opens for low load conditions during heating-
dominant operation.
SV17 Solenoid valve for compressor Open when compressor ON.
Closed when compressor OFF.
PMV1 Cooling bypass flow Opens when ThD1 or ThD2 > 110°C.
control valve Opens when ThS > 20°C.
PMV2 Outdoor flow control valve Opens during cooling-dominant operation.
Degree of opening depending on cooling/heating
demands.
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