DC Inverter Multi VRF System
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5.2 Test operation and debugging
Notice:
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.
（10） If the LED digital tube on main board displays _ _ _ _, then input the startup password.
For operation details, please see the instructions for the function of startup password.
Copyright 2018. This translation is property of GREE PRODUCTS SL. All rights reserved. Total or partial reproduction without its express authorization is prohibited.
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