DC Inverter Multi VRF System
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5.2 Test Operation and Debugging
(1) After finishing the first installation or replacing the main board of outdoor unit, it is necessary to perform test
operation and debugging. Otherwise, unit won’t be able to work.
(2) Test operation and debugging must be performed by professional technicians or under the guidance of
professional technicians.
5.2.1 Prepare the Test Operation and Debugging
(1) Do not connect power until all installation work is finished.
(2) All control circuits and wires are correctly and securely connected.
(3) Check whether the fixing loops for compressor foots are removed.
(4) All small pieces, especially metal chips, thread ends and forceps holder, must be removed
from the unit.
(5) Check whether unit’s appearance and pipeline system has been damaged during
transportation.
(6) Calculate the quantity of refrigerant that needs to be added according to the pipe length.
Pre-charge the refrigerant. In case that the required charging quantity is not reached while
refrigerant can’t be added, record the quantity of refrigerant that still needs to add and
complement the quantity during test operation. For details of adding refrigerant during test
operation, see below.
(7) After refrigerant is added, make sure valves of outdoor unit are completely open.
(8) For the convenience of troubleshooting during debugging, unit shall be connected to a PC
with applicable debugging software. Make sure unit’s real-time data can be checked
through this computer. The installation and connection of debugging software can be found
in the Service Manual.
(9) Before test operation, make sure unit is power on and compressor has been preheated for
more than 8 hours. Touch the unit to check whether it’s normally preheated. If yes, start test
operation. Otherwise, compressor might be damaged.
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