DC Inverter Multi VRF System
21
Check items
Possible conditions due to improper stallation
Check
Is the electric wiring and pipe connection installed
correctly?
Unit may have malfunction or components may
get damaged.
Unit is securely grounded or not?
Electrical leakage.
Power cord meets the required specification?
Unit may have malfunction or components may
get damaged.
Is the air inlet/outlet blocked?
Insufficient cooling (heating) capacity.
Length of refrigerant pipe and the charging amount
of refrigerant are recorded or not?
The refrigerant charging amount is not
accurate.
Binding pieces on compressor feet are removed or
not?
Compressor may get damaged.
5.2 Test Operation and Debugging
NOTICES:
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.
