Mitsubishi Heavy Industries SRK100VNXPZSX Technical Manual page 183

(e) Outdoor unit 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 33°C
2) Compressor's actual frequency
3) Power transistor radiator fin temperature
(ii) Heating
1) Outdoor air temperature Tho-A 16°C
2) Compressor's actual frequency
3) Power transistor radiator fin temperature
(iii) Control contents
1) Raises the outdoor unit 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) W hen the power transistor radiator fin temperature (Tho-P)
1 speed further.
b) W hen C °C > power transistor radiator fin temperature (Tho-P)
maintained.
c) W hen the power transistor radiator fin temperature (Tho-P)
1 speed.
(iv) Ending conditions
When the operation under the condition of item (iii), c) above and with the outdoor unit fan tap, which is determined
by the item (c) is detected 2 times consecutively.
• Compressor's frequency and power transistor radiator fin temperature
Model
FDC100-140
(f) Caution at the outdoor unit fan start control (3 phase models only)
When the outdoor unit fan is running at 400min
only, without starting up the outdoor fan this is normal.
(g) Snow protection fan control
If the dip switch (SW3-2) on the outdoor unit control PCB is turned ON, the outdoor unit 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.
A rps
C °C
B rps
C °C
Item
A B
85 85
-1
before operating the compressor, it may operate with the compressor
Snow protection fan
control ON
3
Outdoor air temp. (°C)
182
-
C °C, the outdoor unit fan tap is raised by
D °C, present outdoor unit fan tap is
D °C, the outdoor unit fan tap is dropped by
C D
72 68
Snow protection fan
control OFF
5
-
'17 • PAC-T-257