Hitachi RAS-3-HVNC - Page 151

5. Control System
137
SMGB0079 rev.0 - 01/2013
5
N O T E
ForRAS-(2-2.5)HVNP/RAS-3HVNC:
• (*1)Morethan39minutes.
• (*2)Ifoutdoortemperatureislessthan-6ºCthenthecompressorisoperatedcontinuouslyformorethan2
minutes.Ifoutdoortemperatureismorethan-6ºCthenthecompressorisoperatedcontinuouslyformorethan
9minutes.
• (*3)Lessthan6ºC.

Condition for Completing Defrost Operation
The defrosting operation is stopped when any of following conditions are met.
1 The outdoor evaporating temperature becomes more than 25
o
C (*1) for 2 minutes from starting the defrosting operation.
2 The outdoor evaporating temperature becomes more than 15
o
C (*2) (the outdoor temperature < 10
o
C) after passing 2
minutes from starting the defrosting operation.
3 The outdoor evaporating temperature becomes more than 5
o
C (the outdoor temperature > 10
o
C) after passing 2 minu-
tes from starting the defrosting operation.
4 The pressure switch for control is “ON”.
5 More than 9 minutes (*3) are passed after starting the defrosting operation.
N O T E
ForRAS-(2-2.5)HVNP/RAS-3HVNC:
• (*1)Morethan20ºC.
• (*2)Morethan10ºC
• (*3)Morethan10minutes.
N O T E
• Thedefrostingoperationisnotstartedimmediatelyeveniftheaboveconditionsaremet.(Thedefrostingcon-
ditionmaybemettemporallydependingontherefrigerantcyclevariability.)
• Thedefrostingoperationisstartedwhentheconditionsaremetcontinuouslyforperiodoftime.