Hitachi RAS-2-HVNP Service Manual page 192

7. Test run
 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
Manual
not available within 5 minutes af-
Defrost
ter starting heating operation
 Manual Defrost Operation
Finishes
Defrost operation is automatica-
lly ended and the heating opera-
tion is started.
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.
178
SMGB0079 rev.0 - 01/2013
 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 G) or Thermo-OFF.
2
•
Do not repeat defrost operation fre-
quently.