Hitachi EV-1.5N1, Service Manual

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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.