Hitachi RAS-(3-6)HVRNM2E Service Manual page 151

5 Control System
Defrost operation control
Heating operation
Defrosting operation
Defrosting
stop condition
No
Operation at slow fan
speed MIF
Operation at low fan
speed MIF
141
SMGB0064 rev.0 - 08/2011
No
Defrosting
Yes
start condition
Yes
Power to MOF : ON
I.U.
intake air
temp.
Lower than set
temp. +2ºC
< 25ºC
I.U.
intake air
temp.
25ºC to 30ºC
Power to RVR: OFF
DEFROST indication
Power to MIF: OFF
Power to MOF: OFF
Yes
Inverter
Frequency of
Comp.
No
Higher than set
temp. +2ºC
≥ 30ºC
Operation at setting fan speed MIF
DEFROST disappears
Power to RVR: ON
I.U. fan operation: LOW
Power to MC : OFF
5