Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 34

(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 speed ➀, 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.
(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 30 seconds.
(iii) Range of the outdoor fan speed under this control is as follows.
1) Lower limit: 130min
※ 1:The fan stops if the outdoor air temperature is less than -5°C and 130min
and outdoor heat exchanger temperature (either Tho-R1 or Tho-R2, whichever is higher) is 28°C or lower. If the
outdoor air temperature is 0°C or higher or the heat exchanger temperature is 33°C or higher, the fan will resume
operation at 130min
2) Upper limit: 500min
(iv) As any of the following conditions is established, this control terminates.
1) When the outdoor air temperature is in the zone
is established for 40 seconds or more continuously.
2) When the outdoor fan speed is 500min
established for 40 seconds or more continuously.
3) When the outdoor heat changer temperature at 44°C or higher is established for 40 seconds or more continuously.
(e) Caution at the outdoor fan start control
When the outdoor fan is running at 400min
compressor only, without starting up the outdoor fan. This is normal.
(f) Snow protection fan control
If the DIP switch (SW3-2) on the outdoor unit control PCB is
turned ON, the outdoor fan is operated for 30 seconds at speed ➃
once in every 10 minutes depending on the outdoor air temperature
(detected with Tho-A) in the stop mode or anomalous stop mode.
zone
5
Outdoor air temperature (˚C)
- 1
- 1
.
- 1
- 1
and the outdoor heat exchanger temperature at 29°C or higher is
-1
or more before operating the compressor, it may operate with the
33
-
in the cooling/dehumidifying mode, it has elapsed 20
zone
10
- 1
is continuously operated for 30 seconds
and the outdoor heat exchanger temperature at 29°C or higher
Snow protection fan
control ON
Outdoor air temperature (°C)
-
'21 • PAC-SM-383
Retained
Outdoor unit fan speed
-10min -1
20
Outdoor heat exchanger temperature (˚C)
Snow protection fan
control OFF
3 5
Outdoor unit fan speed
+10min
-1
30