MCAC-VTSM-2016-04 R410A DC Inverter VRF V4 Plus W Series 50Hz
Troubleshooting 215
3) L2 troubleshooting
Step 1: Check the DC voltage between 1 and 2 terminal, the normal value should be 510V~580V, if the voltage
is higher than 580V, go to step 2.
Step 2: Check the voltage between the two electrolytic capacitors, the normal value should be 510V~580V.
If the value is not in the range, that means the power supply for electrolytic capacitors has problem, you should
check the power supply, whether the voltage is too high and whether the voltage is stable.
If the voltage value is normal, then the main PCB has malfunction, it needs to be replaced.
4) L8/L9 troubleshooting
Step 1: Compressor check
Measure the resistance between each two of U, V, W terminals of the compressor, all the resistance should be
the same and equal to 0.9~5 Ohms. (Fig. A and Fig. B)
Measure the resistance between each of U, V, W terminals of the compressor to ground (Fig. C), all the
resistance should trend to infinity (Fig. D), otherwise the compressor has been malfunction, needs to be
replaced.
Fig. A Fig. B Fig. C Fig. D
If the resistance value are normal, then go to step 2.
Step 2: Disconncet the power wiring from the compressor(named compressor A) of the faulted system(named
system A).
If there is a system running normally nearby(named system B):
range of the meter to
1kV, measure the
voltage between two
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