Hitachi RAS-(4-12)HRNM(2)(E) - Defrost Operation Control

5 Control System
134
SMGB0064 rev.0 - 08/2011
Defrost operation control
Operation at setting fan speed MIF
Operation at slow fan
speed MIF
Heating operation
Defrosting
start condition
Yes
Power to RVR: OFF
DEFROST indication
Power to MIF: OFF
Power to MOF: OFF
No
Defrosting
stop condition
Defrosting operation
Yes
No
DEFROST disappears
Power to RVR: ON
Inverter
Frequency of
Comp.
Yes
No
Power to MOF : ON
I.U.
intake air
temp.
I.U. fan operation: LOW
Power to MC : OFF
Higher than set
temp. +2ºC
Lower than set
temp. +2ºC
I.U.
intake air
temp.
Operation at low fan
speed MIF
≥ 30ºC
25ºC to 30ºC
< 25ºC