Indoor Fan Motor Control - Toshiba Carrier RAS-12EKCV-UL Service Manual

Item
2. Indoor fan <In cooling operation>
motor control
The indoor fan motor is operated in 5 stages in MANUAL
mode (Fig.1) and 5 stages in AUTO mode (Fig. 2)
Table 1 shown the indoor fan speed and air flow rate of
each mode.
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
level
COOL DRY
WF
WE
WD UH UH
WC H H
WB M+ M+
WA M
W9 M
W8
W7 L+ L+
W6 L L
W5 L- L-
W4 UL UL
W3 SUL 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 *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-09EKCV-UL
Fan speed Air flow rate
3
(rpm) cfm (m
1210 336 (571)
1210 336 (571)
1170 321 (546)
1120 303 (515)
1040 274 (465)
1000 248 (421)
960 235 (400)
870 200 (340)
850 194 (330)
760 159 (270)
760 159 (270)
700 141 (240)
650 118 (200)
500 65 (110)
500 65 (110)
(Fig. 1)
Fan speed
W6
(L + M) / 2
W9
(M + H) / 2
WC
(Fig. 2)
RAS-12EKCV-UL
Fan speed
/h)
(rpm)
1510
1510
1480
1430
1280
1220
1150
1000
980
920
900
840
770
620
520
– 30 –
FILE NO. SVM-13071
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.
Air flow rate
3
cfm (m /h)
433 (735)
433 (735)
422 (717)
404 (686)
350 (594)
328 (557)
302 (514)
248 (421)
241 (409)
219 (372)
212 (360)
190 (323)
165 (280)
110 (187)
74 (126)