Operation Description; Outline Of Air Conditioner Control - Toshiba RAS-18UFHP-E3 Service Manual

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 air inlet of the
indoor unit 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.) Heating and Cooling
Model only.

7. OPERATION DESCRIPTION

7-1-1. Louver control
(1) Vertical air flow louver
(2) Swing
7-1-2. Indoor fan control (AC Fan motor)
(1) The indoor fan is operated by the stepless speed
(2) For air flow level, speed of the indoor fan motor is
Operations according
to the commands from
the indoor unit
– 31 –
FILE NO. SVM-04032
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.
If [SWING] button is pressed when the indoor unit
is in operation, the vertical air flow louver starts
swinging. When [SWING] button is pressed, it
stops swinging.
change AC motor.
controlled in five steps (LOW, LOW
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-18UFHP-E3
MODEL
Motor speed Air flow level Motor speed Air flow level
(rpm)
Cooling HIGH 1060
and MED 900
Fan only LOW 800
HIGH 1120
Heating MED 950
LOW 850
RAS-18 UFP-E3
RAS-18UFPX3
MODEL
RAS-18UFP-AR3
Cooling HIGH 1060
and MED 900
Fan only LOW 800
MODEL RAS-18UFPX3-T2
Cooling HIGH 1170
and MED 980
Fan only LOW 800
LOW =
+
MED =
+
+
, MED, MED
RAS-24UFHP-E3
3 3
(m /h) (rpm) (m /h)
800 1170 900
680 1000 750
580 850 650
830 1210 930
700 1020 760
650 860 660
RAS-24UFP-E3
RAS-24UFPX3
RAS-24UFP-AR3
RAS-24UFPX3-T
800 1170 900
680 1000 750
580 850 650
900
730
580
LOW+MED
2
MED+HIGH
2
+