To Next Page

To Previous Page

- 83 -

Test Run

Check to see whether there is any refrigerant leakage, and slack of power or communication cable.

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 insulation resistance.

Check if high/low pressure common pipe, liquid pipe and gas pipe valves are fully opened.

NOTE: Be sure to tighten caps.

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.

1. Checks Before Test Run

CAUTION

when cutting main power of the Multi V

• 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.)

LG Multi V Service Manual

Other manuals for LG Multi V