MAXA BDS28A, Техническое руководство

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8.4.2.4. High temperature and overload protection diagnosis (AP1 herinafter refers to control board of the outdoor unit)
Main detection point:
● Is outdoor ambient temperature in normal range?
● Are the outdoor and indoor fans operating normally?
● Is the heat dissipation environment inside and ouside the unit is good?
8.4.2.5. Start up failure (following AP1 for outdoor unit control board)
Main detection point:
● Whether the compressor wiring is connected correct?
● Is time for compressor stopping enough?
● Is compressor broken?
● Is the refrigerant charging is too much?
Overheat and high temperature protection
Is outdoor ambient temperature higher than 53°C?
20 minutes after the complete unit is powerd off
Does the outdoor fan work normally
Replace the control panel AP1
End
Normal protection, please operate
it after the outdoor ambient temp.
is normalized.
Improve the heat dissipation
environment of the unit
Is heat dissipation of the indoor unit
and outdoor unit abnormal?
1. Check if the fan terminal OFAN is
connected correctly.
2. Resistance between any ohm
gauge and should be less than 1k
Ω .
Replace the fan capacitor C1
Replace the outdoor fan
Yes
No
No
No
Yes
Yes
Power on the unit
Is stop time of the compressor longer than 3 minutes?
Does the start up fail?
Are the wires for the compressor connected correctly?
Is connection sequence right?
Replace the control panel AP1
If the fault is eliminated?
Replace the compressor
End
Restart it up after 3 minutes?
Connect the wires as per the
connection diagram.
Yes
Yes
Yes
Yes
No
No
No
No