Troubleshooting Outdoor Unit Fan Problems - Mitsubishi Electric PURY-M200YNW-A1 Service Handbook

[8-7 Troubleshooting Outdoor Unit Fan Problems ]

8-7 Troubleshooting Outdoor Unit Fan Problems
(1) Fan motor (common items)
The number of revolutions of the outdoor fan is controlled by inverter. Check the number of revolutions of the fan while mon-
itoring the inverter output indicated by the self-diagnosis LED. The table below shows approximate numbers of revolutions of
the fan at the full speed.
Model
Cooling-only or cooling-main
mode
(E)M200 model
(E)M250 model
(E)M300 model
(E)M350 model
(E)M400 model
(E)M450 model
(E)M500 model
When starting the fan, the fan runs at full speed for 5 seconds.
When setting the DIP SW4 (when SW6-10 is set to OFF) as shown in the figure below, the inverter output [%] will appear.
100% indicates the full speed and 0% indicates the stopping.
ON
1 2 3 4 5 6 7 8 9 10
As the revolution of the fan changes under control, at the interphase or when the indoor unit operation capacity is low, the
revolution of the fan may change.
If the fan does not move or it vibrates, Fan board problem or fan motor problem is suspected. When checking the fan motor
for problems by shutting down the power, be sure to disconnect the motor wire from the fan board. If a short-circuited fan board
malfunctions, it will keep the fan motor from rotating smoothly. For details, refer to the following page(s).
[8-10-7 Checking the Fan Motor for Ground Fault and Coil Resistance Problems]
[8-10-8 Checking the Fan Board Error Detection Circuit at No Load]
[8-10-9 Checking the Fan Board for Damage at No Load]
[8-10-10 Checking the Fan Board for Damage with Load]
BS_08_L
Number of revolutions (rpm) *SW6-4 and SW6-5 are OFF.
1. Heating-only or heating-main
mode
2. 5°C ˂ TH7 ≤ 10°C
620
670
720
930
1000
1040
610
Fan 1
SW4
ON
1 2
The figure at left shows that the switches 1 through 5 are set to ON and 6 through 10 are set to OFF.
620
670
850
930
1150
1180
610
3 4 5 6 7 8 9 10
1. Heating-only or heating-main
mode
2. TH7 ≤ 5°C
700
740
850
1010
1150
1180
690
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