LG Air Conditioner LMU243HV

Open isolation ball valves, if any, 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.

Spray one or two glasses of water upon the evaporator

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

Set the Dip Switch as instructed

Check that the LEDs on the PCB are on during operation

Is the Green LED lit up indicating correct wiring?

Record the LED blink pattern if wiring is incorrect

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

Check that each tube between the indoor and outdoor units have been properly connected and all wiring for the test run has been completed

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

Ensure both the liquid and the gas side service valves on the outdoor unit are kept closed at this stage

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

Ensure the high side manifold valve is kept closed

Pressurize the system to no more than 550 P.S.I.G. with dry nitrogen gas

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