MAXA BDS28A Spezifikationen PDF herunterladen (Seite 29)

8.4.2.6 Diagnosis for compressor Out of step (synchronism)(AP1 hereinafter refers to control board of the outdoor unit)

Main detection point:

● Whether the unit voltage is too high?

● Whether the work voltage is too low?

8.4.2.7 Overload and discharge malfunction detect (following AP1 for outdoor unit control board)

Main detection point:

● Wether the electronic expansion valve is connected well or not? ● Is electronic expansion valve damaged?

● Is the refrigerant leaked?

Out of step occurs once the unit is powerd on

Is stop time of the compressor longer than 3 minutes

Are the compressor wires COMP(UVW) connected

correctly? Is connection sequence right? Is the

connection made in clockwise direction?

Replace the control panel AP1

If the fault is eliminated?

Replace the compressor

End

Out of step (synchronism) occurred during operation

Is the outdoor fan

working normally

Is the outdoor unit blocked

by forein objects

Replace the control panel AP1

If the fault is eliminated?

Replace the compressor

End

Check if the fan

terminal OFAN is

connected correctl

Replace the

capacitor C1

Remove foreign

objects (clean

heat exchanger

and increase

ventilation)

Replace the

outdoor fan

Connect

the wires

correctly

Yes

If the input voltage of

unit is normal?

Start to run until the unit

resume normal voltage

If the refrigerant

is too much?

Charge the refrigerant

with technical manual

Yes

Connect the wires correctly?

20 minutes after the complete unit is powered off

Is the terminal FA for the electronic

ansion valve connected correctl

Resistances between the first 4 pins close to the terminal hole

and the fifth

in are almost the same, less than 100Ω.

Replace the electronic expansion valve

If the fault is eliminated?

Replace the control panel AP1

If the fault is eliminated?

Refrigerant leakage, refilling the refrigerant, refer to specification

End

Yes

If the overload protector SAT is well connected?

Under amb. Temp., test the resistance of overload

rotector with ohmeic meter, resistance value is 1000Ω

Replace overload

protector SAT

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