Hitachi RPC-1.5FSR Technical Catalogue page 76

CONTROL SYSTEM
n Defrosting Operation
Heating
Operation
Defrosting
Operation
Defrosting
Stop Condition
is approved.
No
<Defrosting Operation>
The following defrosting operations, "Standard Defrost", "Forced Defrost" and "Manual Defrost" are
available.
(1) Standard Defrost
This operation starts according to the outdoor temperature, the outdoor evaporating temperature and
the operating time.
(2) Forced Defrost
This operation starts when Thermo-ON/OFF operation for each indoor unit is repeated and the
standard defrost is not used.
(3) Manual Defrost
This operation starts when the push switch "PSW1" on the outdoor PCB is pressed and hold for more
than 3 seconds during the maintenance work. (This function cannot be used when the pressure and
the outdoor evaporating temperature is high at the start of the defrosting operation.)
NOTE:
Do not repeat defrost operation frequently.
1-66
No
Defrosting
Yes
Start Condition
is approved.
Yes
I.U.
Air Intake
Temp.
< Set Temp.
MIF Operation at
Slo Fan Speed
Power to
RVR : OFF
> Set Temp. +2 o C
I.U.
< 25 o C > 30 o
Air Outlet
Temp.
25 o C to 29.9 o C
I.U.: Indoor Unit
"DEFROST"
Indication
MIF Operation: OFF
MOF Operation: OFF
Yes
Power to
RVR : ON
"DEFROST" Indication
: OFF
MIF Operation
at Low Fan Speed
MC Operation: OFF
C
MIF Operation at
Set Fan Speed
TCI-20007-rev.1