FILE NO. SVM-05016
7. OPERATION DESCRIPTION
7-1-1. Louver control
(1) Vertical air flow louver
Position of veritcal air flow louver is automatically
controlled according to the operation mode.
Besides, position of vertical air flow louver can be
arbitrarily set by pressing [FIX] button.
The louver position which is set by [FIX] button is
stored in the microcomputer, and the louver is
automatically set at the stored position for the next
operation.
(2) Swing
If [SWING] button is pressed when the indoor unit
is in operation, the vertical air flow louver starts
swinging. When [FIX] button is pressed, it stops
swinging.
7-1-2. Indoor fan control (AC Fan motor)
(1) The indoor fan is operated by the stepless speed
change AC motor.
(2) For air flow level, speed of the indoor fan motor is
controlled in five steps (LOW, LOW
+
, MED, MED
+
and HIGH). If AUTO mode is selected, the fan
motor speed is automatically controlled by the
difference between the preset temperature and
the room temperature.
7-1. Outline of Air Conditioner Control
This is a fixed capacity type air conditioner, which uses
a AC motor for an indoor fan. The AC motor drive
circuit is mounted in the indoor unit. And electrical
parts which operate the compressor and the outdoor
fan motor, are mounted in the outdoor unit.
The air conditioner is mainly controlled by the indoor
unit controller. The controller operates the indoor fan
motor based upon commands transmitted by the
remote control and transfers the operation commands
to the outdoor unit controller.
The outdoor unit controller receives operation
commands from the indoor unit, and operates the
outdoor fan motor and the compressor.
(1) Role of indoor unit controller
The indoor unit controller receives the operation
commands from the remote control and executes
them.
• Temperature measurement at the air inlet of the
indoor heat exchanger by the indoor
temperature sensor
• Temperature setting of the indoor heat
exchanger by the heat exchanger sensor
• Louver motor control
• Indoor fan motor operation control
• LED display control
• Transferring of operation commands to the
outdoor unit
• Receiving of information of the operation status
and judging of the information or indication of
error
(2) Role of outdoor unit controller
The outdoor unit controller receives the operation
commands from the indoor controller and
executes them.
• Compressor operation
control
• Operation control of
outdoor fan motor
• Turning off the compressor and outdoor fan
when the outdoor unit receives the shutdown
command
• Defrost control in heating operation
(Temperature measurement by the outdoor heat
exchanger and control for the four-way valve
and the outdoor fan motor) *Heat pump Model
only
Operations according
to the commands
from the indoor unit
LOW
+
=
MED
+
=
LOW+MED
2
MED+HIGH
2
Table 7-1-1
− 30 −
FAN TAP
Cooling UH H M+
L+
L- SUL/SL-
OPERATION
Fan only
H
M
L
L-
Dry
M
L
L- UL SUL
MODE
Heat
UH H
M+
UL
RAS-24NKHD Series
rpm
1200
1150
1250
1050
1150 1050
Air flow volume (m
3
/h)
790 750
830 790
667
750
667
461 300
RAS-24NKD Series
830
708
750
1050
380 220
Air flow volume (m
3
/h)
708
900
667
667
300
380
1150
950
600
Air flow volume (m
3
/h)
750 584
300
Model
900
RAS-18NKD Series
SUL/SL-
RAS-18NKHD Series
ULL+
M+
Air flo
M
w v
L+
olume (m
L
3
L-
/h)
M
L+
1300
L
1250
800
1100
461
1150
380
950
700
700
900
500
543
1100
461
1300
900
1050
543
584
461
600
800
700
800
700
1000
380
625
543
1000
625
543
900
900
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
1200
800
600
RAS-18NKDX4-T2 Series
rpm
rpm
rpm
rpm
Air flow volume (m
3
/h)
−
−
1300
900
1250
830
−
−
1050
667
−
−
950
584
900
543
800
461
700
380
600
300
−
−
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