Hitachi RAS-(2-3)HVRN(S)(2), Service Manual

Page: 142 / 488

5 Control System
132
SMGB0064 rev.0 - 08/2011
Heating 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
≥ 60 ºC
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
≤ 55 ºC
Setting at
HEAT
HEAT 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
I.U.
air
intake
HEATING
operation
to 1
Higher than set
temp. +2 ºC
Lower than
set temp.
25 ºC ~ 30 ºC
Lower than
25 ºC
Power to
CMC : ON
1 sec.
I.U.
air discharge
temp.
Yes
Power to
MOF
Power to PCB in
O.U.: ON
Pressing
FAN switch
Air
over switch
HIGH indication
MEDIUM indication
LOW indication
Power to YH2 for
20 sec.
MD : ON
(for unit with drain pump)
Power to RVR
: ON
Power
Operation at
slow fan speed
Operation at
setting fan speed
Only for I.U. with
auto-louver
MIF operation
at slow speed
Power to
Y52C : ON
Power to Y21
: ON
Operation at
low fan speed
Higher
than 30 ºC
After 30 sec.
No
* 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
A
A
Continues in the next page.