Hitachi RAS-(4-12)HNP(1)(E) - Condition for Completing Defrost Operation

5 Control System
154
SMGB0087 rev.0 - 12/2013
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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 25ºC (*1) for 2 minutes from starting the defrosting operation.
2 The outdoor evaporating temperature becomes more than 15ºC (*2) (the outdoor temperature < 10ºC) after passing 2
minutes from starting the defrosting operation.
3 The outdoor evaporating temperature becomes more than 5ºC (the outdoor temperature > 10ºC) 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)HVNP1/RAS-3HVNC1:
• (*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condition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.