Standard Operation Sequence Ras-3Hvrc2 And Ras-(4-6)H(V)(R/N)(C/P)2E; Cooling Operation - Hitachi UTOPIA RAS-4HVRP2E Service Manual

5 Control System

Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E

5.5 Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E

5.5.1 Cooling operation

Power to
OU: ON
Power to
IU: ON
Power to YH2
Set Operation
Mode to
"COOL"
HIGH
(HIGH 2)
Press Fan
Speed Switch
LOW
Press
Temperature
Setting Switch
Press
RUN/STOP
Switch
Cooling
Operation
< Set Temperature
Press
AUTO-LOUVER
Switch
to 1
94 SMGB0136 rev.0 - 07/2021
Temperature at
Power to
Top of Compressor
OU PCB: ON
Power to
IU PCB: ON
OFF
(Higher than
Activation Level)
FS
ON
(Lower than
in IU: OFF
Activation Level)
MED
Fan Speed
Switch
▲ Switch: To increase Set Temp.
▼ Switch: To decrease Set Temp.
Power to YH2 for 20 sec.
Individual: ≥ 23°F (-5°C)
Simultaneous: ≥ 5°F(-15°C)
≥ Set Temp.
IU Air
Outdoor
Inlet
Temp.
Temp.
Individual: < 23°F (-5°C)
Simultaneous: < 5°F(-15°C)
< Alternately >
≥ 86°F (30°C) or ≥ Outdoor Temp. 77°F (25°C)
< 86°F (30°C) or < Outdoor Temp. 77°F (25°C)
only for indoor unit
Auto-Louver
with auto-louver
0 Reset
Start of Communication between
Start of Communication between IU
Power to YH2
in IU: OFF
Power to Power
Y52C : to CMC : Elapsed Time:
ON ON
1sec.
No
Start of
Auto-Louver
Stop of
Auto-Louver
Indoor Unit
I.U. :
Outdoor Unit
O.U. :
: Actuator
Power to CH : ON
CH
Power to : OFF
OU and IU
and Wired Controller
MD Operation: ON
for unit with drain pump
"COOL"
Indication
"HIGH (HIGH 2)"
Indication
"MEDIUM"
Indication
"LOW" Indication
Indication of
Set Temp.
RUN Indicator: ON
MIF Operation at
Set Fan Speed
Yes
MC Operation: ON
MOF Operation: ON
Power to
YH2 : ON
MIF Operation: ON
for unit with drain pump
only for Decorative
Panel or Indoor
Unit with Auto-
Louver