Outdoor Fan Control; Outdoor Fan Tap And Fan Motor Speed; Fan Tap Control During Cooling/Defumidifying Operation; Fan Tap Control During Heating Operation - Mitsubishi Heavy Industries FDT71VNXWVH Service Manual

(4)

Outdoor fan control

(a) Outdoor fan tap and fan motor speed
Model
FDC71 Cooling/Dehumidifying
(b) Fan tap control during cooling/defumidifying operation
Fan taps are selected depending on the outdoor heat exchanger temperature (Tho-R1, R2) and the outdoor air temperature (Tho-A).
Note (1) It is detected by Tho-R1 or R2, whichever the higher.
zone
zone Tap 6
zone Tap 6
zone Tap 4
zone Tap 3
zone
zone
15 18
Outdoor air temperature (˚C)
(c) Fan tap control during heating operation
Fan taps are selected depending on the outdoor heat exchanger temperature (Tho-R1, R2) and the outdoor air temperature (Tho-A).
Note (1) It is detected by Tho-R1 or R2, whichever the lower.
zone
zone Tap 1
zone Tap 2
zone Tap 3
zone Tap 3
zone Tap 4
zone
zone
3 6
Outdoor air temperature (˚C)
(d) Outdoor fan control at cooling low outdoor air temperature
(i) When all the following conditions are established after the start of compressor, the following control is implemented.
If the outdoor air temperature (Tho-A) is in the zone
seconds from the start of outdoor fan and the outdoor fan is at the tap 1 speed, the outdoor fan speed is controlled
according to the outdoor heat exchanger temperature (Tho-R1, R2).
Note (1) It is detected with Tho-R1 or R2, whichever the higher.
zone
12 15
Outdoor air temperature (˚C)
(ii) The outdoor heat exchanger temperature is detected always and, when the number of revolutions of the outdoor fan
speed has been increased or decreased, there is no change of fan speed for 20 seconds.
Mode
①
200
Heating 200
zone zone
Tap 6 Tap 6
Tap 6 Tap 6
Tap 4 Tap 3
Tap 3 Tap 2
zone
zone
46 48
32 34
zone zone
Tap 1 Tap 2
Tap 2 Tap 3
Tap 3 Tap 4
Tap 4 Tap 5
Tap 5 Tap 6
zone
12 15
zone
Indoor heat exchanger temperature (Thi-R1, R2)
-
Fan motor tap
speed speed speed
② ③
400 600
400 600
zone
Tap 4
Tap 3
Tap 2
Tap 1
zone
zone
20 30
Outdoor heat exchanger temperature (˚C)
zone
zone
1 3
zone
-2 0
Outdoor heat exchanger temperature (˚C)
in the cooling/dehumidifying mode, it has elapsed 20
Tap 2
47
Tap 1
49 53
(Thi-R1 or R2, whichever the higher)
43
-
'19 • PAC-SM-332
speed speed speed
④ ⑤ ⑥
710 810 850
710 810 850
zone
zone
43 53
33 40
zone
zone
11 14
5 8
Unit: min -1
speed
⑦
950
950