2-19
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
ON/OFF
※
3
OFF
Evaporator fan. Low speed
EFL
Condenser fan
CF
ON/OFF
※
1
ON/OFF
※
1
Liquid solenoid valve
LSV
OFF
OFF
Economizer solenoid valve
ESV
ON/OFF
※
4
OFF
Injection solenoid valve
ISV
OFF (ON
※
5)
ON/OFF
※
2
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
OFF(ON
※
6)
Capillary solenoid valve
CSV
OFF
OFF
Suction modulating valve
SMV
100%
100%
Electronic expansion valve
EV
10 to 100%
5%
Operation of magnetic contactor and solenoid valve
Note)
※
1: Pressure control
※
2: Charging control
※
3: Frozen mode ... EFL ON, Chilled mode ... EFH ON
※
4: Economizer control
※
5: Discharge gas temperature control
※
6: EOS>15˚C
Magnetic
contactor
Solenoid
valve
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