Carrier 42NQV050M Service Manual page 30

Item
2. Indoor fan
<In heating operation>
motor control
HEAT ON
Fan speed setup
AUTO
YES
TC ≥ 42 C
NO
(Fig. 4)
Basic fan control
[ C ]
TA
b
TSC
c
–0.5
d
–1.0
e
–1.5
f
–2.0
g
–2.5
–5.0
–5.5
*1: Fan speed = [(M+)-(L+)] x 1 4 + L+
*2: Fan speed = [(M+)-(L+)] x 2 4 + L+
*3: Fan speed = [(M+)-(L+)] x 3 4 + L+
(Calculated with linear approximation from M+ and L+)
(Fig. 5)
[In starting and in stability]
• Until 12 minutes passed after operation start
FAN AUTO • When 12 to 25 minutes passed after operation
start and room temp. is 3°C or lower than set temp.
FAN Manual • Room temp. < Set temp. –4°C
Operation flow and applicable data, etc.
MANUAL
Indication
L
L+
M
M+
H
Min air flow rate control
Limited to Min WD tap
Tc
52
51
*
42
41
No limit
* Fan speed =
(TC –
Fan speed
AUTO
L+ (W9)
*1
*2
*3
M+ (WD)
H (WE)
In starting
– 29 –
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
(Fig. 3)
shown in Fig. 5 according to the set
temperature and room temperature.
Fan speed
3) Min air flow rate is controlled by
W8
temperature of the indoor heat
(L + M) / 2
exchanger (Tc) as shown in Fig. 4.
WA
4) Cold draft prevention, the fan
speed is controlled by temperature
(M + H) / 2
of the indoor heat exchanger (Tc)
WE
as shown in Fig. 6.
5) In order to prevent Cold draft when
compressor step during heating
operation. Then louver will move to
upper position and fan speed will
reduce or off.
– W8) + W8
Cold draft preventive control
Tc
46 46 34
45 45 33
33 33 21
32 32 20
*A+4 *A+4 *A+4
*A-4 *A-4 *A-4
* 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
(Fig. 6)
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
FILE NO. SVM-10052
Description
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