Operation Description; Outline Of Air Conditioner Control - Toshiba RAS-24UKX Service Manual

7-1. Outline of Air Conditioner Control

This is a fixed capacity type air conditioner, which uses
a DC motor for an indoor fan. The DC 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 com
mands 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 tempera-
ture 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 ex-
ecutes 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

7. OPERATION DESCRIPTION

Operations according
to the commands from
the indoor unit
– 17 –
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 [SET] button.
The louver position which is set by [SET] button is
stored in the microcomputer, and the louver is
automatically set at the stored position for the next
operation.
(2) Swing
If [AUTO] button is pressed when the indoor unit is
in operation, the vertical air flow louver starts
swinging. When [AUTO] button is pressed again, it
stops swinging.
7-1-2. Indoor fan control (DC Fan motor)
(1) The indoor fan is operated by the stepless speed
change DC motor.
(2) For air flow level, speed of the indoor fan motor is
controlled in five steps (LOW, 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.
Table 7-1-1
RAS-24UKX
RAS-24UK-AR
MODEL
Motor speed Air flow level Motor speed Air flow level
(rpm)
Cooling HIGH 1350
and MED 1150
Fan only LOW 1000
FILE NO. SVM-01010
RAS-18UKX
RAS-18UK-AR
(m 3 /h) (rpm) (m 3 /h)
950 1150 750
750 1050 650
600 900 530