DC Inverter Multi VRF System
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5 Check Items after Installation and Test Operation
5.1 Check Items after Installation
Check items
Possible conditions due to improper
installation
Check
Each part of the unit is installed securely?
Unit may fall, shake or emit noise.
Gas leakage test is taken or not?
Insufficient cooling (heating) capacity
Unit gets proper thermal insulation or not?
There may be condensation and dripping.
Drainage is smooth or not?
There may be condensation and dripping.
Is the voltage in accordance with the rated voltage
specified on the nameplate?
Unit may malfunction or components may
get damaged.
Is the electric wiring and pipe connection installed
correctly?
Unit may malfunction or components may
get damaged.
Unit is securely grounded or not?
Electrical short
Power cord meets the required specification?
Unit may 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.
Metal pieces on compressor feet are removed or
not?
Compressor may get damaged.
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 will not work.
Test operation and debugging must be performed by 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 metal pieces on compressor feet are removed.
(4) All small debris and tools, 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.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
