LG Air Conditioner LMCN123HV

Spray one or two glasses of water upon the evaporator

Ensure that water flows through the drain hose of indoor unit without any leakage

Check that all tubes and wiring are properly connected

Remove the service valve caps from both the gas and the liquid sides on the outdoor unit

Are both the liquid and gas side service valves on the outdoor unit closed?

Connect the manifold valve and dry nitrogen gas cylinder to the service port with charge hoses

Is the high side manifold valve kept closed?

Pressurize the system to 550 P.S.I.G. with dry nitrogen gas

Close the cylinder valve when the gauge reading reaches 550 P.S.I.G.

Open isolation ball valves, if installed in the piping system.

Verify service ports and stem head access caps

Remove caps on both liquid and gas (vapor) suction Schrader ports.

Connect nitrogen cylinder regulator to gauge manifold and Schrader ports.

Perform leak/pressure check at 150 psig for 15 minutes.

Perform leak/pressure check at 300 psig for 30 minutes.

Set the Dip Switch as instructed

Check that the LEDs on the PCB are on during operation

Describe the LED display if wiring is incorrect

Return the Dip Switch to normal operation after completing the wiring error check.