Hitachi RAS-(4-12)HNP(1)(E) - Heating Operation

5 Control System
149
SMGB0087 rev.0 - 12/2013
5
5.4.3 Heating operation
Power to
outdoor unit:
ON
Power to CH: ON
Power to PCB in
IU: ON
Start of transmission between IU
and OU.
Start of transmission between IU
and remote control switch.
Auto-louver 0 reset
Setting at
HEAT
HEAT indication
Set temperature
indicated
Pressing
TEMP switch
switch: increasing set temperature
switch: decreasing set temperature
Pressing
RUN/STOP
switch
IU
air in-
take temp.
HEATING
operation
to 1
Power to PCB in
OU: ON
Pressing
FAN switch
Air
ow
change over
switch
HIGH indication
MEDIUM indication
LOW indication
Run LED: ON, RUN is indicated
Power to YH2 for
20 sec.
Only for indoor unit with
auto-louver
Power to
MOF
1 sec.
Power to Y21:
ON
Lower than set
temperature
+2ºC
Lower than
-1ºC in set
temp.
Tem-
perature on
the top of comp.
≥ 75ºC
(for RAS-(2-2.5)HVNP
and RAS-3HVNC ≥ 60ºC)
< 75ºC
(for RAS-(2-2.5)HVNP
and RAS-3HVNC < 60ºC)
Power to CH: OFF
MD: ON
For unit with drain pump
After
power
supply
Indication of unit stoppage
cause (d1-22)
Temp
on the top of
comp.
Temp
on the top of
comp.
Temp
on the top of
comp.
< 4 hours
(*< 2 hours)
< 50ºC
(*< 30ºC)
< 25ºC
(*< 15ºC)
≥ 25ºC
(*≥ 15ºC)
≥ 50ºC
(*≥ 30ºC)
≥ 4 hours
(*≥ 2 hours)
≥ Ta+20ºC
< Ta+20ºC
* Test run:
Hot start protection is
activated after 2 hours
or 15ºC
Only RAS-12HN(P/C)
Power to
CMC: ON
No
Yes
Operation at
slow fan speed
Power to
indoor unit:
ON
MIF operation
at slow speed
A
Power to
Y52C or RY1:
ON
Power
Power to RVR:
ON
After 30 sec.
After 48 sec.
IU
demand
frequency
< 90Hz
Power to YH2:
OFF
Power to YH2:
ON
≥ 90Hz
for unit
with EHW
Power to
EHW: ON
MOF
operation at
set fan speed
Permitting
downward air
ow by auto-
louver
Higher than
30ºC
only for indoor unit
with auto-louver
IU
air
discharge temp.
Operation at slow
fan speed
(with Thermo-OFF:
low fan speed)
Lower than
25ºC
25ºC ~ 30ºC
IU: Indoor unit
OU: Outdoor unit
Continues in the next page.