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2.5.3 Defrosting mode
Start defrosting
Is terminating
condition OK?
●Defrost lamp (red) ON
●Pump down
Defrosting range
Defrosting lamp (red) OFF
Return to frozen, chilled or partial
frozen operation
Evaporator fan On after delay of 60 seconds
●Compressor ON
●Evaporator fan OFF
●Condenser fan ON/OFF
●
Defrosting solenoid valve
ON
●
Hot gas solenoid valve
ON
No
Yes
Yes
Component name Pump down Defrosting
Compressor CC ON ON
Evaporator fan. High speed EFH
OFF OFF
Evaporator fan. Low speed EFL
Condenser fan CF ON
ON/OFF ※2
Liquid solenoid valve LSV OFF OFF
Economizer solenoid valve ESV ON OFF
Injection solenoid valve ISV OFF
ON/OFF ※1
Hot-gas solenoid valve HSV OFF ON
Defrost solenoid valve DSV OFF ON
Discharge gas by-pass solenoid valve
BSV OFF OFF
Reheat solenoid valve RSV OFF
ON/OFF ※3
Suction modulating valve SMV 100% 100%
Electronic expansion valve EV 200〜2000
pls
0
pls
Operation of magnetic contactor and solenoid valve
Note) ※1: Charging control
※2: Release control
※3: RSV:ON EOS>15˚C
Magnetic
contactor
Solenoid valve
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