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DC Inverter Multi
VRF Service Manual
2) Communication wire shall be independently paved by ame-retarded PVC pipe and can’t in the same trunking
with power cord. The parallel distance between communication wire and strong current wire shall be greater than 20 cm.
3) Control wires of all electric expansion valves and power cord of 4-way valve shall be reliably connected to the
mainboard of corresponding indoor unit. If there is any abnormality, handle it immediately. The debugging can be resumed
after the problem has been solved.
3.2.6 Before debugging, install and get familiar with the software for debugging.
3�3 Debugging
3.3.1 Cautions:
1) Before the debugging starts, make sure that the units have been energized for more than 8 hours so that the
compressor can be preheated. Touch the unit by hand to check if the preheating is normal, and if it is, debugging can be
started or the compressor is likely to be damaged. The debugging must be conducted or under guidance of the professional.
2) When the debugging is started up, choose proper running mode according to the ambient temperature.
When ambient temp is above 20 , the debugging mode shall be complete cooling mode.
When ambient temp is lower than 20 , the debugging mode shall be complete heating mode.
3) When debugging, the system will start one indoor unit every 5 min until all indoor units have been started up.
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