Standard Operation Sequence For Ivx Series; Cooling Operation - Hitachi RAS-(3-6)HVRNM2E Service Manual

5 Control System
5.4 Standard operation sequence
5.4.1 Standard operation sequence for IVX Series

Cooling operation

Power to
O.U.: ON
Power to
I.U.: ON
Setting at
COOL
Pressing
FAN switch
Pressing
TEMP.
switch
Pressing
RUN/STOP
switch
< 4 hours
After
(* < 2 hours)
power
supply
≥ 4 hours
(* ≥ 2 hours)
COOLING
operation
Lower than
set temp.
to 1
Continues in the next page.
128
SMGB0064 rev.0 - 08/2011
Power to PCB in
O.U.: ON
Auto-louver 0 reset
Power to PCB in
I.U.: ON
FS
Power to YH2 in
ON
I.U.: OFF (Lower than activation level)
Air
over switch
Switch: increasing set temp.
Switch: decreasing set temp.
Power to YH2 for
A
20 sec.
Indication of unit
stoppage cause (d1-22)
< 50 ºC
Temp.
(* < 30 ºC)
on the top of
comp.
≥ 50 ºC
(* ≥ 30 ºC)
A
Higher than set
temp. +2 ºC
I.U. Air
Outdoor
intake temp.
temp.
< -5 ºC
(for unit with EHW)
Power to
EHW:ON
I.U.: Indoor unit
O.U.: Outdoor unit
Temp.
≤ 55 ºC
on the top
of comp.
≥ 60 ºC
Only for I.U. with
auto-louver
OFF
(Higher than
activation level)
Power to YH2 in
I.U.: ON
for unit with drain pump
for unit with EHW
Run LED:ON, RUN is indicated
Operation at set indoor fan speed
< 40 ºC
Temp.
(* < 30 ºC)
on the top of
comp.
≥ 40 ºC
(* ≥ 30 ºC)
Temp.
< Ta+20 ºC
on the top of
comp.
≥ Ta+20 ºC
≥ -5 ºC
Power to
Y52C : ON
Power to
sec.
CMC : ON
No
Power to YH2 in
I.U.:OFF
Power to CH : ON
Power to CH : OFF
Start of transmission between
I.U. and O.U.
Start of transmission between
I.U. and remote control switch
MD : ON
(for unit with drain pump)
COOL indication
HIGH indication
MEDIUM indication
LOW indication
Set temp. indicated
MD : ON
Power to EHW:ON
Only RAS-8~12HRNM
* Test Run:
Hot start protection is activated
after 2 hours or 30ºC.
* Standard operation:
Hot start protection is activated
after 4 hours or 40ºC.
Power
Yes
1
Outdoor fan
MOF operation
(for unit with drain pump)
MD : ON