Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 17

(4) Outdoor unit fan control
(a) Outdoor unit fan tap and fan motor speed
Model
71 Cooling/Dehumidifying
100 Cooling/Dehumidifying
125, 140 Cooling/Dehumidifying
(b) Fan tap control during cooling/heating operation
Fan taps are selected depending on the outdoor unit 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 5(6)
zone Tap 5(6)
zone Tap 4
zone Tap 3
Note (1) Value in ( ) are for the model 71.
zone
zone
15 18
Outdoor air temp. (˚C)
(c) Fan tap control during heating operation
Fan taps are selected depending on the outdoor unit 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 3
zone Tap 3
zone Tap 4
Note (1) Value in ( ) are for the model 71.
zone
zone
3 9
Outdoor air temp. (˚C)
(d) Outdoor unit fan control at cooling low outdoor air
1) 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 unit fan and the outdoor unit fan is at the tap 1 speed, the outdoor unit fan speed is
controlled according to the outdoor unit heat exchanger temperature (Tho-R1, R2).
Note (1) It is detected with Tho-R1 or R2, whichever the higher.
zone
5
Outdoor air temp. (˚C)
Mode
speed
200
Heating 200
speed
200
Heating 200
speed
200
Heating 200
zone zone zone
Tap 5(6) Tap 5(6) Tap 4
Tap 5(6) Tap 4(6) Tap 3
Tap 4 Tap 3 Tap 2
Tap 3 Tap 2 Tap 1
zone
zone
46 48
30 37
zone zone
Tap 3 Tap 4
Tap 4(5) Tap 5
Tap 5 Tap 6
zone
12 15
zone
Outdoor unit fan speed
-10min
10
-
Fan motor tap
speed speed speed
400 600 710
400 600 710
speed speed speed
350 600 740
350 600 740
speed speed speed
370 560 640
370 560 640
zone
33
zone
20 30
Outdoor unit heat exchanger temp. (˚C)
zone
zone
1 3
zone
-2 0
Outdoor unit heat exchanger temp. (˚C)
in the cooling/dehumidifying mode, it has elapsed 20
Outdoor unit fan speed
+10min
Retained
-1
20 30
Outdoor unit heat exchanger temp. (˚C)
17 -
'10 • PAC-SM-137A
Unit: min
speed speed speed
810 850 950
810 850 950
speed speed speed
820 870 950
820 870 950
speed speed speed
745 870 910
800 870 910
zone
zone
43 53
40
-1
-1