Hitachi RPC-5.0FSR - Page 76

CONTROL SYSTEM
1-66
TCI-20007-rev.1
n
Defrosting Operation
“DEFROST” Indication
: OFF
Heating
Operation
No
No
Yes
Yes
Defrosting
Start Condition
is approved.
Defrosting
Stop Condition
is approved.
Defrosting
Operation
Power to
RVR : OFF
“DEFROST”
Indication
I.U.
Air Intake
Temp.
I.U.
Air Outlet
Temp.
< Set Temp.
> Set Temp. +2
o
C
MIF Operation at
Slo Fan Speed
MIF Operation at
Low Fan Speed
> 30
o
C
25
o
C to 29.9
o
C
< 25
o
C
Power to
RVR : ON
I.U.: Indoor Unit
Yes
MIF Operation at
Set Fan Speed
MIF Operation: OFF
MOF Operation: OFF
MC Operation: OFF
MIF Operation
at Low Fan Speed
<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.