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Valve and sensor function and operation
Sensor and switch operation
Multi Controller sensor operation
Temperature According to a difference between the evaporator outlet temperature and
sensor (ThA, B, C, D) saturation temperature (ThX):
a. Performs superheat control.
(cooling operation)
b. Determines the degree of opening of PMV 2.
(cooling-dominant operation)
Outdoor unit sensor and switch operation
Discharge pressure Determines the frequency of the inverter compressor and the ON/OFF status of
sensor D.O.L. compressor.
Controls the outdoor unit fan operation.
Controls the hot gas bypass SV2.
Controls the changeover from outdoor unit main heat exchanger to sub heat
exchanger.
Suction temperature Controls the degree of opening of PMV 1.
sensor (ThS) Stops operation when ThS > 40°C for 10 minutes (Fault code [A7]).
Discharge temperature Controls the degree of opening of PMV 1.
sensor (ThD1, ThD2) Stops operation when the discharge temperature > 130°C (Fault code [A6]).
Outdoor unit heat Controls the defrost operation.
exchanger sensor (TE) Controls the outdoor unit fan operation.
Heating operation Controls the high pressure release valve SV1.
Outdoor temperature Controls the hot gas bypass SV2.
sensor (ThO) Controls the outdoor unit fan operation.
Prevents heating operation when ThO > 25°C.
High pressure switch Stops operation when Pd > 30 kgf/cm
2
G.
Low pressure switch Stops operation when suction pressure < 0.25 kgf/cm
2
G:
• After 30 seconds for cooling operation.
• After 10 minutes for heating operaton.
The low pressure switch is ignored during defrost operation.
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