Indoor Fan Motor Control - Toshiba RAS-22SKV2-A1 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
+1.0 c
d
+0.5
e
Tsc
(Table 1) Indoor fan air flow rate
Fan speed
COOL
level
WF
WE
WD
WC H
WB M+
WA
W9 M
W8
W7 L+
W6 L
W5 L-
W4 UL
W3 SUL
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 : Fan speed = [(M +) –L] x 2/4 + L
*4
*5 *5 : Fan speed = [(M +) –L] x 1/4 + L
(Linear approximation
L(W6)
from M+ and L)
Fan speed
HEAT DRY
(rpm)
UH 1250
H 1250
M+ 1250
1200
M 1050
1020
L+ 980
L 850
L- L+ 810
L 800
UL L- 760
UL 700
SUL 650
SUL 500
500
(Fig. 1)
Fan speed
W6
(L + M) / 2
W9
(M + H) / 2
WC
(Fig. 2)
Air flow rate
3
(m /h)
1156
1156
1156
1101
938
902
858
702
659
648
605
540
485
324
324
– 27 –
FILE NO. SVM-12002
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.