Dry 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

5.5.2 Dry operation

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