Indoor Fan Motor Control - Toshiba RAS-25N4KVRG-ND Service Manual

Item
2. Indoor fan <In cooling operation>
motor control
(This 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 1)
COOL ON
Fan speed setup
AUTO
Ta
[ °C ]
+2.5
a
+2.0
b
+1.5
c
+1.0
d
+0.5
e
Tsc
Fan speed Mode
level
Cool Heat
WF UH
WE UH H
WD H M+
WC M+
WB M
WA M
W9 L+
W8 L+ L
W7 L L-
W6 L-
W5 UL UL
W4
W3 SUL
W2 SUL
W1
Operation flow and applicable data, etc.
MANUAL
Indication
L
L+
M
M+
H
Air volume AUTO
M+(WC)
*3 *3 : Fan speed = (M + –L) x 3/4 + L
*4 *4 : Fan speed = (M + –L) x 2/4 + L
*5 *5 : Fan speed = (M + –L) x 1/4 + L
(Linear approximation
L(W7)
from M+ and L)
(Table 1) Indoor fan air flow rate
RAS-25N4KVRG-ND
Cooling
Dry Fan speed Air flow rate
(rpm) m /hr
3
1100 750
1100 750
UH 1000 650
H 950 610
M+ 900 570
M 800 490
650 370
L+ 630 360
580 320
L 530 280
L- 520 270
UL 510 260
SUL/SL- 510 260
500 260
500 260
(Fig. 1)
Fan speed
W7
(L + M) / 2
WA
(M + H) / 2
WD
(Fig. 2)
Cooling
Heating
Fan speed Air flow rate Fan speed
(rpm) m /hr
3 (rpm)
1200 810
1100
1150 770 1100
1000 650
1050
900 570
1000
800 490 900
700 410 800
650 370
650
580 320
630
550 300 580
530 280
530
520 270
520
510 260 510
510 260 510
510 260
500
500 260
500
- 29 -
Description
* Symbols
UH : Ultra High
H : High
M+ : Medium+
M : Medium
L+ : Low+
L : Low
L- : Low–
UL : Ultra Low
SUL : Super Ultra Low
* The fan speed broadly varies due
to position of the louver, etc.
The described value indicates one
under condition of inclining
downward blowing.
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 Fig. 1.
2)
When setting the fan speed to
AUTO on the remote controller,
revolution of the fan motor is
controlled to the fan speed level
shown in Fig. 2 and Table 1
according to the setup
temperature, room temperature,
and heat exchanger temperature.
RAS-35N4KVRG-ND
Heating
Air flow rate Fan speed Air flow rate
m /hr m
3 (rpm) 3
750 1200 810
750 1170 780
690 1050 690
650 900 570
570 800 490
490 700 410
370 650 370
360 580 320
320 550 300
280 530 280
270 520 270
260 510 260
260 510 260
260 510 260
260 500 260
/hr