Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 127

(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.
(iii) Rage of the outdoor fan speed under this control is as follows.
1) Lower limit: 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 45°C or higher is established for 40 seconds or more.
(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
(ii) Heating
1) Outdoor air temperature (Tho-A)
2) Compressor's actual frequency
3) Power transistor radiator fin temperature
(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)
further.
b) When C °C > power transistor radiator fin temperature (Tho-P)
c) When the power transistor radiator fin temperature (Tho-P)
(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
FDC71
FDC100
FDC125, 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.
-1
-1
-1
and the outdoor heat exchanger temperature at 30°C or higher is
33°C
A rps
C °C
16°C
B rps
C °C
Item
A B
60 70
65 65
65 65
-1
before operating the compressor, it may operate with the compressor only,
Snow protection fan
control ON
3
Outdoor air temperature (°C)
126
-
and the outdoor heat exchanger temperature at 30°C or higher
C °C, the outdoor fan tap is raised by 1 speed
D °C, present outdoor fan tap is maintained.
D °C, the outdoor fan tap is dropped by 1 speed.
C D
80 75
72 68
72 68
Snow protection fan
control OFF
5
-
'19 • PAC-T-327