Hitachi RAS-3-HVNC - Troubleshooting Procedure

7. Test run
178
SMGB0079 rev.0 - 01/2013
Manual
Defrost
 Manual Defrost Operation
Starts
Press PSW1 for more than 3 se-
conds during heating operation,
the defrost operation is started
after 2 minutes.This function is
not available within 5 minutes af-
ter starting heating operation
 Manual Defrost Operation
Finishes
Defrost operation is automatica-
lly ended and the heating opera-
tion is started.
 Defrost operation is available regar-
dless of frosting condition and total time
of heating operation.
 Defrost operation in not performed
when the temperature of outdoor heat
exchanger is higher than 10°C, high
pressure is higher than 3.3 MPa (33kgf/
cm
2
G) or Thermo-OFF.
• Do not repeat defrost operation fre-
quently.
N O T E
IncaseofRAS-(2-2.5)HVNPorRAS-3HVNCoperationisperformedbyDSW301onthePCBoftheoutdoorunit
insteadofDSW1.