Prevent-Freezing Control; P. M. V. (Pulse Modulating Valve); Louver Control; Indoor Fan Control - Toshiba RAS-M10NKV-E Service Manual

6-1-4. Prevent-Freezing Control

The indoor heat exchanger sensor detects refriger-
ant vapor temperature in COOL/DRY operation. If
the temperature is below the specified value, com-
pressor motor speed is reduced so that operation is
performed in temperature below the specified value
to prevent-freezing of indoor heat exchanger.

6-1-5. P. M. V. (Pulse Modulating Valve)

Using P .M.V., refrigerant flow of refrigeration cycle is
varied for the optimum temperature. Controlling
each unit separately by four P .M.V. corresponds to
difference of pipe length, fan speed, and unit tem-
perature.
If an error occurs on cycle temperature when power
source of the air conditioner has been turned on,
and if start/stop times of the outdoor unit are 30
times, move the valve once until it hits on the stopper
for positioning of the valve. In this case, ticktack
sound may be heard.
Fan
operation
mode
mode
H
M+
Cooling
M
and Fan
only
L+
L
L-
L+
L
DRY
L-
UL
SUL
H
M+
M
Heating
L+
L
L-
NOTE :
• UL : Ultra Low, SUL : Super Ultra Low
Table 6-1-2
M10
Remote
Motor speed
Air flow rate
Control
(rpm)
HIGH
1190
1120
MED+
1120
MED
1050
LOW+
980
930
LOW
910
850
930
910
850
720
660
HIGH
1250
1200
MED+
1160
MED
1060
LOW+
1000
1050
LOW
940
930

6-1-6. Louver Control

(1) Vertical air flow louvers
Positions of vertical air flow louvers are automati-
cally controlled according to the operation status
(AUTO, COOL, DRY, HEAT). Besides, positions of
vertical air flow louvers can be arbitrarily set by
pressing the [FIX] button. The louver position which
has been set by the [FIX] button is stored in micro-
computer, and the louver is automatically set at the
stored position in the next operation.
(2) Swing
If the [SWING] button is pressed during running
operation, vertical air flow louvers start swinging.
When the [SWING] button is pressed again, swinging
stops.

6-1-7. Indoor Fan Control

The indoor fan is operated by motor speed non-step
variable drive system motor. For flow rate, motor
speed is controlled manually in five steps and with
the unit of 10 rpm from upper limit to lower limit in
AUTO mode as described in Table 6-1-2. It is not
selected by relay, so selecting sound does not
generate.
M13
Motor speed
Air flow rate
3
(m /h)
(rpm)
570 1210
530
1130
530
1130
490
1050
440
980
420
930
410
910
370
850
420
930
410 910
370
850
290
750
260 700
610
1290
570 1280
550
1200
490 1100
460 1020
490
1050
420
940
420
930
− 10 −
FILE NO. SVM-05019
M16
Motor speed
Air flow rate
3 (rpm)
(m /h)
590
1350
530 1250
530
1250
490
1150
440 1070
420
1000
410
980
370
920
420
1000
410 980
370
920
310
920
280 800
620
1370
620 1360
570
1280
520
1180
470 1100
490
1150
420
1020
420 1000
3
(m /h)
650
610
610
550
500
460
440
410
460
440
410
410
340
660
660
620
560
520
550
470
460