Indoor Fan Motor Control - Toshiba RAS-15EKV-UL 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
°F [°C]
+4.5 (+2.5)
a
+3.5 (+2.0)
b
+2.7 (+1.5)
c
+2.0(+1.0)
d
+1.0 (+0.5)
e
Tsc
(Table 1) Indoor fan air flow rate
Fan speed
COOL HEAT
level
WF UH
WE
WD UH M+
WC H
WB M+
WA
W9 M L+
W8
W7 L+
W6 L
W5 L- UL
W4 UL
W3 SUL
W2 SUL
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)
RAS-15EKV-UL
DRY
Fan speed
(rpm)
1100
H 1100
UH 1090
H 1070
M+ 980
M 940
890
L 780
L- L+ 750
L 740
L- 700
UL 700
SUL 650
500
500
(Fig. 1)
Fan speed
W6
(L + M) / 2
W9
(M + H) / 2
WC
(Fig. 2)
RAS-17EKV-UL, RAS-22EKV-UL
Air flow rate Fan speed
cfm (m3/h)
583 (991)
583 (991)
577 (980)
563 (957)
505 (858)
479 (813)
446 (758)
374 (636)
355 (603)
348 (591)
322 (547)
322 (547)
290 (492)
191 (325)
191 (325)
– 31 –
FILE NO. SVM-13070
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 values of fan speed and air flow
volume indicate on the table are measured
when the louver is inclined downward.
Fan speed and air flow volume broadly
vary with position of louver.
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
and room temperature.
Air flow rate
(rpm) cfm (m3/h)
1200 648 (1101)
1200 648 (1101)
1200 648 (1101)
1180 635 (1079)
1080 570 (968)
1020 531 (902)
980 505 (858)
850 420 (713)
810 394 (669)
800 387 (658)
760 361 (614)
700 322 (547)
650 290 (492)
500 191 (325)
500 191 (325)