Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 177

b) Low frequency operation control during heating
[Control condition] When the conditions of compressor protection start III are established and one of following conditions
[Control contents]
(d) Outdoor unit fan control
1) Outdoor unit fan tap and fan motor speed
Model
71
100~140
200, 250
Notes (1) Fan motor speed for model 200 and 250 are same for both top and bottom lines
(2) Figures in ( ) are for model 125, 140.
(3) Figures in ( ) are for model 250.
2) Fan tap control during cooling/heating operation
Fan taps are selected depending on the outdoor unit heat exchanger temperature (Tho-R1, R2) and the ambient air temperature (Tho-A).
Note (1) It is detected by Tho-R1 or R2, whichever the higher.
• Model 71 ~ 140
Tap 5(6)
zone
zone
zone
zone
Note (1) Figures in ( ) are for model 71.
3) Fan tap control during heating operation
Fan taps are selected depending on the outdoor unit heat exchanger temperature (Tho-R1, R2) and the ambient air temperature (Tho-A).
Note (1) It is detected by Tho-R1 or R2, whichever the lower.
• Model 71 ~ 140
zone
zone
zone
and is satisfied, the low number of revolutions operation control is performed during heating.
At 30 minutes or more after turning the power supply breaker on
Compressor underneath temperature (Tho-H) is 4°C or higher and the difference from the
outdoor air temperature (Tho-A) becomes 4°C or higher. [model 200, 250 only]
Starts the compressor with its target frequency at A rps. However, when the indoor unit
return air temperature (Th
At 30 seconds after the start of compressor, the compressor's target frequency is changed to
B rps and the compressor's operation frequency is fixed for 10 minutes.
Model
100~140
200, 250
Mode
Cooling/dehumidifying
Heating
Cooling/dehumidifying
Heating
Cooling/dehumidifying
Heating
zone zone zone
Tap 5(6) Tap 5
Tap 5 Tap 5 Tap 4
Tap 4 Tap 4 Tap 3
Tap 3 Tap 3 Tap 2
zone zone zone
Tap 3 Tap 3 Tap 4
Tap 3 Tap 4 Tap 5
Tap 4 Tap 5 Tap 6
-A) is 25°C or higher, it start at C rps.
I
Operation mode
Cooling/dehumidifying
Cooling/dehumidifying
speed speed speed
200 400 600
200 400 600
speed speed speed
200 400 600
200 400 600
speed speed speed
200 370 560 (600)
200 370 560 (600)
• Model 200, 250
zone
Tap 4
zone
Tap 3
zone
Tap 2
zone
Tap 1
zone
• Model 200, 250
zone
Tap 3
zone
Tap 3
zone
Tap 4
zone
170
– –
A rps B rps
55 55
55 30
Fan motor tap
speed speed speed
740 810 850
740 810 850
speed speed speed
740 820 870
740 820 870
speed speed speed
(3) 820 850 910
(3) 820 850 910
zone zone
Tap 5 Tap 5 Tap 5
Tap 5 Tap 5 Tap 4
Tap 4 Tap 4 Tap 3
Tap 3 Tap 3 Tap 2
zone zone
Tap 3 Tap 4
Tap 4 Tap 5
Tap 5 Tap 6
C rps
30
30
-1
Unit: min
speed
950
950
speed
910
910 (950) (2)
speed
950
950
zone zone
Tap 4
Tap 3
Tap 2
Tap 1