Outdoor Fan Control; Outdoor Fan Speed And Fan Motor Rotation Speed; Fan Control During Cooling - Mitsubishi Heavy Industries KX6 series Service Manual

(4) Outdoor fan control
(a) Outdoor fan speed and fan motor rotation speed.
The 7th outdoor fan speed in the following table is specified as the rated speed. Under the normal control, the speeds up
to 8th level (800 min
Outdoor fan tap
0th speed
1th speed
2th speed
3th speed
4th speed
5th speed
6th speed
7th speed
8th speed
Note (1) Figures in the parentheses in the above table are applicable to FDC(S)224KXE6M.
(b) Fan control during cooling
During cooling and dehumidifying, fan speed is controlled in accordance with the high pressure (sensed by PSH) and the
outdoor air temperature (sensed by Tho-A).
(i) Initial fan speeds are as follows.
Initial ourdoor fan speed at cooling
Model
All models
(ii) During normal operation, the speed is changed in accordance with the high pressure value.
➀ When it has detected HP ≧ 2.2 MPa for 1 minute continuously, the fan speed is raised by one tap.
➁ When it is 1.5 MPa < HP < 2.2 MPa, the present fan speed is maintained.
➂ When it has detected HP ≦ 1.5 MPa for 1 minute continuously, the fan speed is dropped by one tap.
➃ Control range of fan speed is 1th – 8th speeds.
One tap down
(iii) When states under this control change from HP < 3.3 MPa to HP ≧ 3.3 MPa, the fan speed is changed preferentially
to the followings. (After the change it returns to the normal control.)
➀ When the outdoor air temperature ≧ 30ºC, it changes to 7th or higher speed.
➁ When the outdoor air temperature < 30ºC, it changes to 3th or higher speed.
➂ When the fan speed was higher than the above before the change of states, the fan speed is not changed.
- ) are used.
Cooling
FMo1 [min - ] FMo2 [min
0
200
200
300
400
500
575
700
800
Outdoor air temp ≤ 10ºC
2th speed
Maintained
1.5
High pressure (MPa)
- ] FMo1 [min
0 0
0 200
200 200
300 300
400 400
500 500
575 575
700 700
800 800 (780)
10ºC < Outdoor air Temp. < 15ºC
4th speed
One tap up
2.2
15
- -
'10 • KX-SM-148
Heating
- ] FMo2 [min - ]
0
0
200
300
400
500
575
700
800 (780)
15ºC ≤ Outdoor air Temp.
6th speed