Indoor Fan Motor Control - Toshiba RAS-137SKV-E 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, respec-
tively. (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
(Table 1) Indoor fan air flow rate
Fan speed
level COOL HEAT DRY
WF UH
WE
WD UH
WC H
WB M+
WA
W9 M
W8
W7 L+
W6 L
W5 L-
W4 UL
W3 SUL
W2 SUL
W1
Operation flow and applicable data, etc.
MANUAL
Indication
L
M
H
Air volume AUTO
M+(WB)
*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(W6)
from M+ and L)
RAS-137SKV-E
Fan speed Air flow rate
(rpm) (m3/h
1240 630
H 1240 630
UH
M+ 1190 596
H
1140 563
M
M+
1040 496
M
100 469
L+ 960 443
L
870 383
L- L+ 850 369
L 760 309
UL L- 760 309
UL 700 269
SUL 650 236
500 135
500 135
(Fig. 1)
Fan speed
W6
W9
WC
(Fig. 2)
RAS-167SKV-E
Fan speed Air flow rate
(rpm) (m3/h)
1470 743
1470 743
1440 723
1390 691
1250 601
1190 563
1120 518
970 421
950 408
890 370
870 357
810 318
750 280
600 183
500 119
– 30 –
FILE NO. SVM-08011
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,
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 tempera-
ture, room temperature, and heat
exchanger temperature.