Hitachi RAS-10HRNM, Service Manual, Page: 138 / 482

Dry operation
Temp.
on the top of
comp.
Power to
O.U.: ON
Power to CH : ON
Power to CH : OFF
I.U.: Indoor unit
O.U.: Outdoor unit
Power to
I.U.: ON
Power to PCB in
I.U.: ON
Start of transmission between
I.U. and O.U.
Start of transmission between
I.U. and remote control switch
Auto-louver 0
Reset
Power to YH2 in
I.U.: OFF
FS
MD : ON
≤ 55 ºC
OFF
(Higher than
activation level)
ON
(Lower than activation level)
(for unit with drain pump)
Setting at
DRY
DRY indication
Set temp. indicated
Pressing
TEMP.
switch
Switch: increasing set temp.
Switch: decreasing set temp.
Pressing
RUN/STOP
switch
Run LED:ON, RUN is indicated
Indication of unit
stoppage cause (d1-22)
After
power
supply
Temp.
on the top of
comp.
Temp.
on the top of
comp.
Temp.
on the top of
comp.
< 4 hours
(* < 2 hours)
≥ 4 hours
(* ≥ 2 hours)
< 50 ºC
(* < 30 ºC)
≥ 50 ºC
(* ≥ 30 ºC)
< 40 ºC
(* < 30 ºC)
≥ 40 ºC
(* ≥ 30 ºC)
< Ta+20 ºC
≥ Ta+20 ºC
Power to YH2 : ON
MD : ON
(for unit with
drain pump)
Power to EHW : ON
I.U. Fan Operation: Low
I.U. Air
intake temp.
DRY
operation
Power to MC: OFF
Power to MIF: OFF
6
min.
I.U. fan
operation: low
to 1
Higher than Set
Temp. +2 ºC
Lower than set
temp.
< -5 ºC
≥ -5 ºC
No
Yes
Power to
Y52C : ON
6
min.
No
Yes
1 sec.
Outdoor
Temp.
No
Yes
Power
to MC
Power to YH2 in
I.U.: ON
Outdoor Fan MOF operation
* Test Run:
Hot start protection is activated
after 2 hours or 30ºC.
* Standard operation:
Hot start protection is activated
after 4 hours or 40ºC.
Only RAS-8~12HRNM
≥ 60 ºC
Only for I.U. with
auto-louver
Continues in the next page.
5 Control System
130
SMGB0060 rev. 1- 12/2010