Test Run; Checks Before Test Run - LG Multi V ARWM072CAS5 Service Manual

Test Run

Test Run

1. Checks Before Test Run

1 Check to see whether there is any refrigerant leakage, and slack of power or communication cable.
2 Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and ground. Do
not operate in the case of 2.0 MΩ or less.
NOTE: Never carry out megaohm check over terminal control board. Otherwise the control board would be
broken.
Immediately after mounting the unit or after leaving it turned off for an extended length of time, the
resistance of the insulation between the power supply terminal board and the ground may decrease
to approx. 2 MΩ as a result of refrigerant accumulating in the internal compressor.
If the insulation resistance is less than 2 MΩ, turning on the main power supply and energizing the
crankcase heater for more than 6 hours will cause the refrigerant to evaporate, increasing the insu-
lation resistance.
3 [For Heat Recovery system]
Check if liquid pipe and high/low pressure gas pipe valves are fully opened.
[For Heat Pump system]
Check if the liquid pipe and gas pipe valves are fully opened.
NOTE : In case of Heat Pump system, check if liquid pipe and
gas pipe valves fully opened.
But the middle positioned pipe
valve should be closed. (No use)
NOTE: Be sure to tighten caps.
4 Check if there are any problems in automatic addressing or not:
Check and confirm that there are no error messages in the display of indoor units or remote controls and
LED in outdoor units.
CAUTION
when cutting main power of the Multi V Water5
• Always apply main power of the Outdoor unit during use of product
(cooling season/heating season).
• Always apply power before 4 hours to heat the crank case heater where performing test run after
installation of product. It may result in burning out of the compressor if not preheating the crank
case with the electrical heater for more than 4 hours.(In case of the outdoor temperature below 10°C)
CAUTION
Preheat of compressor
• Start preheat operation for 4 hours after supplying main power.
• In case that the outdoor temperature is low, be sure to supply power 4 hours before operation so
that the heater is heated(insufficient heating may cause damage of the compressor.)
Liquid pipe
Liquid Low pressure
gas pipe
High pressure
gas pipe
Heat Recovery
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All right reserved. Only for training and service purposes
Liquid pipe
Not used
Gas pipe
Heat Pump