Indoor Fan Motor Control - Toshiba RAS-10SAV-A 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 and air flow rate
Fan speed
level COOL HEAT DRY
WF
WE
WD
WC
WB
WA
W9
W8
W7
W6
W5
W4
W3
W2
W1
Operation flow and applicable data, etc.
MANUAL
Indication
L
L+
M
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)
Fan speed
(rpm)
UH 1350
H 1300
UH M+ UH 1250
H H 1200
M+ M M+ 1120
M 1100
M L+ 1040
L 960
L+ L- L+ 910
L L 880
L- UL L- 830
UL UL 800
SUL SUL 700
SUL 650
600
(Fig. 1)
Fan speed
W6
(L + M) / 2
W9
(M + H) / 2
WC
(Fig. 2)
RAS-10SKV-E
RAS-10SKV-A
Air flow rate
3
(m /h)
607
576
554
522
486
468
444
402
376
360
334
318
266
239
213
– –
28
FILE NO. SVM-07008
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 tempera-
ture, room temperature, and heat
exchanger temperature.