LG Multi V ARUB Series Installation Manual page 71

How to Cope with Test Run Abnormality
The phenomena from main component failure
Component Phenomenon
Not operating
Compressor
Stop during running
High pressure error
Outdoor
at cooling
fan
Heating failure, fre-
quent defrosting
No operating sound
at applying power
Outdoor
Heating failure,
EEV
Frozen outdoor heat
exchanger part
Low pressure error
or discharge temper-
ature error
When system fault occurs, the error code is displayed at indoor unit display or remote control display, the trou-
ble shooting guide is in the service manual
Test Run
The test operation starts automatically by operating the DIP switch and buttons in the main unit as follows.
(1) Before turning on the system, turn on the Dip switch No7,8, turn on the No.1 Dip switch for cooling test and No.1,2 on for the
heating test operation . After that, turn on the system. And you must wait for 1 minute.
(2) If you turn on the No.7 and 8 DIP switch and press the black button for 2.5 seconds, you will see a character that looks like 'St' in
the 7segment. When you turn both No. 7 and 8 off at this time, the test operation will start.
(3) Indoor units are automatically setting as strong wind mode, set temperature to 30°C for heating and 18°C for air conditioning
(4) When the compressor is normally operated with the operating logic, the target frequency will be 30Hz and when operated for
more than 7 minutes after step (3), the unit will proceed to the next step.
(5) Turn on one constant speed compressor, maintain the target frequency of the compressor to 40Hz and maintain this condition
for 10.
(6) Turn off the constant speed compressor that is on and at the same time turn on the other compressor.
(7) Maintain the compressor that has been turned on newly in step (6) minutes (for series).
(8) Maintain all compressors on for 10 minutes until the rotational switching operation of turning on each compressor at a time is
completed.
(9) Proceed to the next stage when step (8) is completed.
(10) Turn off the constant speed compressor, wait 3 minutes and raise the target frequency of the compressor to 95Hz. This opera-
tion keeps about 7min.
(11) Start the oil return operations.
(12) When the oil return operation is completed, set the compressor frequency to 0 and maintain all indoor devices off.
(13) When step (12) is completed, it means that the test operation is completed. Turn off the No. 1, 2 of DIP switch in the main unit
and must reset the system.
(14) If there is any error during the operation, the error code will be shown in 7segment and the test operation will automatically end.
(The error does not include poor operation of the constant speed compressor and communication error from the indoor
device.)
Cause
Motor insulation broken Check resistance between terminals and
chassis
Motor insulation failure Check resistance between terminals and
chassis
Motor failure, Check the outdoor fan operation after being
Bad ventilation around turned the outdoor units off for some time.
outdoor heat exchanger Remove obstacles around the outdoor units
Bad connector contact Check connector
Coil failure Check resistance between terminals
EEV clogged Service necessary
EEV clogged Service necessary
Check method and Trouble shooting
Installation Manual 71
Test Run