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MCAC-VTSM-2016-02
R410A All DC Inverter Mini VRF
2.3 The resistance between 1, 2,3,4,5 should be infinite. If any of them is about 0, which means the module
has already been broken down; we need to replace the module.
3 Compressor's characteristics
3.1 Measure the resistance among the compressor's U, V, W respectively. The resistance should range from
0.9 to 5 Ohms and be the same.
3.2 Measure the resistance between the compressor's U,V,W and GND respectively. The resistance should
be more or less mega-Ohms.
3.3 Measure the current of the compressor's U, V, W terminal respectively, which should be more or less the
same, by e.g. current flow table clamp. They should be 4A at the frequency of 35 Hertz.
4 P6 appears after the compressor turns on with difficulties
4.1 Check the module according to step 3 first.
4.2 If the module works, make the machine standby for 4 hours with power supply, which can help heating
the refrigerant and oil adequately.
4.3 Start the fixed frequency compressor only for 3S to 5S.The great startup pressure could wash the
impurity away in the tube.
4.4 If the compressor's frequency climbs to 37 Hertz or above in 2S after turning on, then there's something
wrong with the compressor. Check the compressor.
4.5 If the compressor's current is normal, the malfunction appears on the control board. Please replace it.
5 The machine is powered on and "0" will appear for few seconds, then quantities of indoor units that have
been connected will appear if the machine is normal.
Troubleshooting
77
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