5 Control System
Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E
SMGB0136 rev.0 - 07/2021
98
5.5.3 Heating operation
I.U. :
O.U. :
:
Indoor Unit
Outdoor Unit
Actuator
Power to OU: ON
Power to OU PCB:
ON
Temp. at Top of
Compressor
Power to
CH
: ON
Power to IU: ON
Power to IU PCB:
ON
Auto-Louver
0 Reset
only for indoor unit with
auto-louver
Start of Communication between OU
and IU
Start of Communication between IU
and Wired Controller
Set Operation
Mode to "HEAT"
"HEAT" Indication
Fan Speed
Switch
Press Fan Speed
Switch
HIGH
(HIGH 2)
MED
LOW
"HIGH (HIGH 2)"
Indication
"MEDIUM"
Indication
"LOW" Indication
Indication of
Set Temp.
Press
Temp. Setting
Switch
▲ Switch: To increase Set Temp.
▼ Switch: To decrease Set Temp.
Press RUN/STOP
Switch
Power to
YH2
for 20 sec.
MD
Operation: ON
for unit with drain pump
RUN Indicator: ON
IU Air Inlet Temp.
≤ Set Temp.
> Set Temp.
Elapsed Time:
1 sec.
Power to
Y52C
: ON
MC
Operation: ON
MOF
Operation: ON
Yes
No
MIF
Operation at Slo
Fan Speed
to 3
Power to
RVR
: ON
(*)
Elapsed
Time:
≥ 3min.
Pd < 261 psi
(1.8MPa)
Yes
No
No
Yes
only for Indoor Unit
with Auto-Louver
MIF
Operation at
Set Fan Speed
IU Air Inlet
Temp.
≥ 86°F
(30°C)
< 77°F
(25°C)
≥ 77°F (25°C) and
< 86°F (30°C)
MIF
Operation at Low Fan
Speed
MIF
Operation at Slo Fan
Speed (with Thermo-OFF:
Low Fan Speed)
(*) Refer to Service Manual for the timing diagram of the reversing valve.
Power to
CMC
: ON
Power to
CH
: OFF
Downward Angle of
Auto-Louver: Available
Heating Operation
< 86°F (30°C) or < Outdoor Temp. 77°F (25°C)
≥ 86°F (30°C) or ≥ Outdoor Temp. 77°F (25°C)
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