Mitsubishi Heavy Industries SRK100VNXPZSX Technical Manual page 77

(ii) The outdoor unit 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) Range of the outdoor unit fan speed under this control is as follows.
1) Lower limit: 130 min
2) Upper limit: 500 min
(iv) As any of the following conditions is established, this control terminates.
1) When the outdoor air temperature is in the zone
higher is established for 40 seconds or more continuously.
2) When the outdoor fan speed is 500 min
established for 40 seconds or more continuously.
3) When the outdoor unit heat changer temperature at 45°C or higher is established for 40 seconds or more.
(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) Contents of control
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) When the power transistor radiator fin temperature (Tho-P)
speed further.
b) When C °C > power transistor radiator fin temperature (Tho-P)
maintained.
c) When the power transistor radiator fin temperature (Tho-P)
speed.
(iv) Ending conditions
When the operation under the condition of item 2), c) above and with the outdoor unit 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, 125, 140
(f) Caution at the outdoor unit fan start control (3 phase model only)
When the outdoor unit fan is running at 400 min
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.
-1
-1
-1
and the outdoor unit heat exchanger temperature at 30°C or higher is
A rps
C °C
B rps
C °C
Item
A B
65 65
-1
before operating the compressor, it may operate with the compressor
Snow protection fan
control ON
3
Outdoor air temp. (°C)
76
-
and the outdoor unit heat exchanger temperature at 30°C or
C °C, the outdoor unit fan tap is raised by 1
D °C, present outdoor unit fan tap is
D °C, the outdoor unit fan tap is dropped by 1
C D
72 68
Snow protection fan
control OFF
5
-
'17 • PAC-T-257