Outline Of Air Conditioner Control - Toshiba RAS-24SKP-ES2 Service Manual

7-2. 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.
The outdoor unit 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 measurement 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
Table 7-2-3 Indoor fan and air flow rate
Cooling
OPERATION
Fan only
MODE
Dry
rpm
RAS-24SKP-ES2
Air flow volume (m
Cooling
Fan only
OPERATION
Dry
MODE
Heat
rpm
RAS-24SKHP-ES2
Air flow volume (m
Operations according
to the commands
from the indoor unit
UH
1340
1240
/h)
3
UH
UH H M+
1340
3 /h)
1240
- 18 -
• Turning off the compressor and outdoor fan
when the outdoor unit receives the shutdown
command
• Defrost control in heating operation
(Temperature measurement by the Indoor heat
exchanger, control the four-way valve and
outdoor fan motor control)
7-2-1. Louver contr ol
(1) V er tical 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 [SWING] button is pressed, it stops
swinging.
7-2-2. Indoor Fan Control
The operation controls the fan speed at indoor unit
side. The indoor fan (cross flow fan) is operated by
the phase control induction motor. The fan rotates in 5
stages in MANUAL mode, and in 5 stages in AUTO
mode, respectively. (Table 7-2-3)
1) When setting the fan speed to L, L+,M, M+ or H
on the remote controller, the operation is performed
with the constant speed shown in Table 7-2-1 and
Table 7-2-2
Table (7-2-1) Cooling
Indication Fan speed
L Low
(L + M) / 2
L+
Med
M
(M + H) / 2
M+
High
H
2) When setting the fan speed to AUTO on the remote
controller, revolution of the fan motor is controlled
to the fan speed level show in Table 7-2-3
according to the setup temperature, room temperature,
and heat exchanger temperature.
FAN TAP
H M+ M L+
H M+ M L+
M+ M L+
1220 1100 1025
1120 1000 930
FAN TAP
H M+ M
H M+ M
M+ M
M L+
1220 1100 1100
1120 1000 1000
FILE NO. SVM-10049
Table (7-2-2) Heating
Indication Fan speed
L Low
L+ (L + M) / 2
M Med
M+ (M + H) / 2
H High
L L- UL SL
L L-
L L- UL SL
950 850 700 600
850 750 600 500
L+ L L-
L+ L L-
L+ L L-
L L- UL
950 950 950 850
850 850 850 750
UL SL
UL SL
SL
700 600
600 500