Mitsubishi FDT100VNXWVH Service Manual page 44

(e) Outdoor fan control by the power transistor radiator fin temperature
When all the following conditions are established later than 3 minutes after the start of compressor, the following
control is implemented.
(i) Cooling/dehumidifying
1) Outdoor air temperature (Tho-A)
2) Compressor's actual frequency
3) Power transistor radiator fin temperature C °C
(ii) Heating
1) Outdoor air temperature (Tho-A)
2) Compressor's actual frequency
3) Power transistor radiator fin temperature C °C
(iii) Control contents
1) Raises the outdoor fan tap by 1 tap.
2) When the sampling is for 60 minutes and the value of power transistor radiator fin temperature (Tho-P) is as
follows.
a) When the power transistor radiator fin temperature (Tho-P) C °C, the outdoor fan tap is raised by 1 speed
further.
b) When C °C > power transistor radiator fin temperature (Tho-P) > D °C, present outdoor fan tap is maintained.
c) When the power transistor radiator fin temperature (Tho-P) D °C, the outdoor fan tap is dropped by 1 speed.
(iv) Ending conditions
When the operation under the condition of item 2), c) above and with the outdoor fan tap, which is determined by the
item (b) is detected 2 times consecutively.
• Compressor's frequency and power transistor radiator fin temperature
Model
FDC100-140
(f) Caution at the outdoor fan start control (3 phase model only)
When the outdoor fan is running at 400min
without starting up the outdoor fan this is normal.
(g) Snow protection fan control
If the dip switch (SW3-2) on the outdoor control PCB is turned ON, the outdoor fan is operated for 30 seconds at 4 tap
speed once in every 10 minutes depending on the outdoor air temperature (detected with Tho-A) in the stop mode or
anomalous stop mode.
33°C
A rps
16°C
B rps
Item
A B
65 65
-1
before operating the compressor, it may operate with the compressor only,
Snow protection fan
control ON
3
Outdoor air temperature (°C)
43
- -
C D
72 68
Snow protection fan
control OFF
5
'20 • PAC-SM-351