Hitachi RAS-(2-6)HVNP1(E), Service Manual

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5 Control System
145
SMGB0087 rev.0 - 12/2013
5
5.4 Standard operation sequence
5.4.1 Cooling operation
Power to
outdoor unit:
ON
Power to CH: ON
Power to
indoor unit:
ON
Power PCB in IU: ON
Start of transmission between IU
and OU.
Start of transmission between IU
and remote control switch.
Auto-louver 0 reset
Power to YH2 in
IU: OFF
FS
MD : ON
(Higher than activation level)
(Lower than activation level)
(for unit with drain pump)
Setting at
COOL
COOL indication
Set temperature
indicated
Pressing
TEMP switch
switch: increasing set temperature
switch: decreasing set temperature
Pressing
RUN/STOP
switch
IU
air
intake temp.
COOLING
operation
to 1
Power to PCB in
OU: ON
Power to YH2 in
IU: ON
Pressing
FAN switch
Air
flow
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
Outdoor fan MOF
operation
Power to
Y52C or RY
1
:
ON
1 sec.
Power to YH2
in IU: OFF
Lower than
set temp.
Higher than set
temp. +1ºC
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
ON
OFF
MD: ON
Power to EHW: ON
For unit with drain pump
For unit with EHW
Operation at set indoor fan speed
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)
Out-
door temp.
< -5ºC
≥ -5ºC
Power to
CMC: ON
No
Yes
Power
MD: ON
(for unit with drain pump)
Power to EHW: ON
(for unit with EHW)
IU: Indoor unit
OU: Outdoor unit
N O T E
RY1 in OU’s PCB3 (8,10 and 12 HP only)
YH2 in IU’s PCB
Y52C in OU’s PCB1
Continues in the next page.