Toshiba RAS-4M23SACV-E, Service Manual

Page: 45 / 121

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Item
2. Indoor fan
motor control
Operation flow and applicable data, etc.
<In heating operation> (Heat pump model)
Description
1) When setting the fan speed to L,
L+, M, M+ or H on the remote
controller, the operation is per-
formed with the constant speed
shown in Fig. 3 and Table 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. 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.
[In starting and in stability]
(Fig. 3)
(Fig. 4)
(Fig. 5)
Cold draft preventive control
(Fig. 6)
FAN AUTO
FAN Manual
In starting
• Until 12 minutes passed after operation start
• When 12 to 25 minutes passed after operation
start and room temp. is 3°C or lower than set temp.
• Room temp. < Set temp. –4°C
In stability
• When 12 to 25 minutes passed after operation start
and room temp. is higher than (set temp. –3°C)
• When 25 minutes or more passed after operation start
• Room temp.
≥
Set temp. –3.5°C
Fan speed
AUTO
Basic fan control
* 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
TSC
TA [˚C]
b
–0.5
c
–1.0
d
–1.5
e
–2.0
f
–2.5
g
–5.0
–5.5
L (W8)
M+ (WD)
*1
*2
*3
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
WA
(M + H) / 2
WE
Indication Fan speed
Fan speed setup
HEAT ON
AUTO
YES
NO
MANUAL
TC ³ 42˚C Min air flow rate control
Tc
52
51
42
41
Limited to Min WD tap
* Fan speed =
(TC – (42 + a)) / 10 × (WD – W8) + W8
a : In up operation 1, in down operation 0
No limit
*
*1: Fan speed = (M + –L) × 1
÷
4 + L
*2: Fan speed = (M + –L) × 2
÷
4 + L
*3: Fan speed = (M + –L) × 3
÷
4 + L
(Calculated with linear approximation from M+ and L)