– 52 –
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
HEAT ON
Fan speed setup
MANUAL
(Fig. 3)
Indication
Fan speed
Hi Power
AUTO
L
L+
M
M+
H
W8
W9
(L + M) / 2
(L + M) / 2
WB
WD
(M + H) / 2
(M + H) / 2
WE
WF
Min air flow rate control
YES
NO
(Fig. 4)
(Fig. 5)
(Fig. 6)
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)
TC
≥
42°C
Basic fan control
Limited to Min WD tap
No limit
Tc
Fan speed =
(TC – (40 + a)) / 10 × (WD – W8) + W8
a : In up operation 1, in down operation 0
Tc
H (WE)
Line-approximate
H and SUL with Tc.
SUL (W2)
Stop
Fan speed MANUAL in starting
Fan speed AUTO in stability
Fan speed AUTO in starting
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
M+ (WD)
H (WE)
L+ (W9)
M (WB)
Fan speed
Hi Power
Cold draft preventive control
TA [°C]
TSC
–0.5
–1.0
–1.5
–2.0
–2.5
–5.0
–5.5
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.
