Dry Operation - Hitachi RAS-(3-6)HVNC1(E) Service Manual

5 Control System
5.4.2 Dry operation
Power to
outdoor unit:
ON
Power to
indoor unit: Power PCB in IU: ON
ON
Power to YH2 in
Pressing
TEMP switch
Pressing
RUN/STOP
switch
< 4 hours
After
(*< 2 hours)
power
supply
≥ 4 hours
(*≥ 2 hours)
DRY
operation
to 1
IU: Indoor unit
OU: Outdoor unit
Continues in the next page.
147
SMGB0087 rev.0 - 12/2013
perature on
the top of comp.
Auto-louver 0 reset
FS
ON
(Lower than activation level)
IU: OFF
switch: increasing set temperature
switch: decreasing set temperature
Power to YH2: ON
Higher than set
temperature
IU
+2ºC
out-
air intake
door temp.
temp.
< -5ºC
Lower than set
temperature
Power to MC: OFF
Power to MIF: OFF
No
6 min.
Yes
IU fan operation: Low
Indication of unit stoppage
cause (d1-22)
< 50ºC
Temp
(*< 30ºC)
on the top of
comp.
≥ 50ºC
(*≥ 30ºC)
Tem-
≤ 55ºC
≥ 60ºC
Only for indoor unit with
auto-louver
OFF
(Higher than activation level)
Power to YH2 in
IU: ON
Power to EHW: ON
IU fan operation:
Low
≥ -5ºC
Power to
1 sec.
Y52C: ON
No
Outdoor fan MOF operation
Only RAS-12HN(P/C)
* Test run:
Hot start protection is
< 25ºC
Temp
activated after 2 hours
(*< 15ºC)
on the top of
or 15ºC
comp.
≥ 25ºC
(*≥ 15ºC)
Temp
< Ta+20ºC
on the top of
comp.
≥ Ta+20ºC
Power to CH: ON
Power to CH: OFF
Start of transmission between IU
and OU.
Start of transmission between IU
and remote control switch.
MD : ON
(for unit with drain pump)
Set temperature
indicated
MD: ON
(for unit with drain pump)
Yes
Power to
MC
No
6 min.
Yes
Run LED: ON, RUN is indicated
5