Toshiba RAS-4M27UAV-E, Service Manual

Page: 60 / 152

– 60 –
2. Indoor fan
motor control
(Continued)
<In heating operation>
(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 2)
Item Operation flow and applicable data, etc. Description
1: Fan speed = (M + -L) × 1/5 + L+
2: Fan speed = (M + -L) × 2/5 + L+
3: Fan speed = (M + -L) × 3/5 + L+
4: Fan speed = (M + -L) × 4/5 + L+
(Calculated with linear approximation from M+ and L+)
5: Fan speed = (H – M) × 1/5 + M
6: Fan speed = (H – M) × 2/5 + M
7: Fan speed = (H – M) × 3/5 + M
8: Fan speed = (H – M) × 4/5 + M
(Calculated with linear approximation from H and M)
Fan speed
TSC
TA [ C]
b
–0.5
c
–1.0
d
–1.5
e
–2.0
f
–2.5
g
–5.0
– 5 . 5
L+ (W9)
4
1
2
3
M+ (WD)
Hi Power
M (WB)
8
5
6
7
H (WE)
H (WE )
Line-approximate
H and SUL with Tc.
SUL (W2 )
Stop
46 46
Tc
34
45 45 33
33 33 21
32 32 20
A+4 A+4 A+4
A-4 A-4 A-4
Fan speed MANUAL in starting
Fan speed AUTO in stability
Fan speed AUTO in starting
L
L+
M
M+
H
W8
(L + M) / 2
WB
(M + H) / 2
WE
Indication Fan speed
W9
(L + M) / 2
WD
(M + H) / 2
WF
Hi Power
YES
NO
Min air flow rate control
MANUAL
Tc
52
51
42
41
Limited to Min WD tap
Fan speed =
(TC – ( 40 + a )) / 10 × ( WD – W8 ) + W8
No limi t
TC
Fan speed setup
AUTO
HEAT ON
(Fig. 3)
(Fig. 4)
(Fig. 5)
Cold draft preventive control
(Fig. 6)
No limitation while fan speed MANUAL mode is in
stability.
A: When Tsc 24, A is 24, and when Tsc < 24, A is Tsc
Tsc: Set value
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. 3 and
Table 2.
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. 5 according
to the set temperature and room
temperature.
3) Min air flow rate is controlled by
temperature of the indoor heat
exchanger (Tc) as shown in Fig. 4.
4) Cold draft prevention, the fan speed
is controlled by temperature of the
indoor heat exchanger (Tc) as shown
in Fig. 6.
+00A10-023_01EN.book Page 60 Wednesday, April 6, 2011 2:43 PM