Dry Operation - Hitachi RASC-4HNPE Service Manual

5 Control system
Standard operation sequence

5.3.2 Dry operation

Power to
R.U: ON
Power to I.U: Power to PCB in
ON
Power to YH2 in
I.U: OFF
Setting at
DRY
Pressing
TEMP switch
Pressing
RUN/STOP
switch
Power to YH2 : ON
DRY
air intake
operation
Power to MC: OFF
Power to MIF: OFF
Yes
operation: low
to 1
82 SMGB0091 rev.2 - 11/2015
Auto-louver 0
Reset
I.U: ON
FS
ON
(Lower than activation level)
Switch: increasing set temperature
Switch: decreasing set temperature
Higher than set
temperature +2 ºC
IU
Outdoor
Temperature
temp.
Lower than set
< -5 ºC
temperature
No
6 min.
IU fan
I.U: Indoor unit
R.U: RASC unit
Temperature
< 75 ºC
on the top of
compressor
> 80 ºC
(Only for indoor unit with
auto-louver)
OFF
(Higher than activation level)
Power to YH2 in
I.U: ON
IU Fan Operation:
Low
≥ -5 ºC
Power to
Y52C : ON
No
RASC Fan MOF operation
Power to CH: ON
Power to CH: OFF
Start of transmission between I.U
and R.U
Start of transmission between I.U
and remote control switch
MD: ON
(for unit with drain pump)
DRY indication
Set temperature
indicated
Run LED: ON,
RUN is indicated
MD: ON
(for unit with drain pump)
1
Yes
Power to
sec.
MC
No
6
min.
Yes