Solenoid valve
Magnetic
contactor
2-9
2.5.1 Frozen mode
Control state transition and common control
Component name Thermostat ON Pump down Thermostat OFF
Compressor CC ON ON OFF
Evaporator fan. High speed EFH OFF OFF OFF
Evaporator fan. Low speed EFL ON ON ON
Condenser fan CF ON / OFF※1 ON / OFF※1 OFF
Liquid solenoid valve LSV ON OFF OFF
Economizer solenoid valve ESV ON(OFF※3) ON(OFF※3) OFF
Injection solenoid valve ISV OFF(ON※2) OFF(ON※2) OFF
Hot-gas solenoid valve HSV OFF OFF OFF
Defrost solenoid valve DSV OFF OFF OFF
Discharge gas by-pass solenoid valve
BSV OFF OFF OFF
Suction modulating valve SMV 100%
Electronic expansion valve EV 10 to 100%
Note) ※1: High pressure control
※2: Injection control (Refer to Page 2-18)
※3: Economizer control (Refer to Page 2-19)
RS > SP + 1.0˚C
LPT<–50kPa
RS : Return air temperature LPT : Low pressure transducer
SP : Setting point temperature
Thermostat OFF
●Compressor Stop
●Evaporator fan Low speed
Pump down
●Compressor Running
●Evaporator fan Low speed
Thermostat ON (Pull-down range)
●Compressor Running
●Evaporator fan Low speed (L)
≤
≤
Continuous compressor running for
2 minutes or more and RS SP
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