Mitsubishi Air Conditioner MSY-GS12NA

Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.

Fully close the stop valve on the liquid pipe side of the outdoor unit.

Close the stop valve on the gas pipe side of the outdoor unit almost completely.

Monitor the pressure gauge until it shows 0 psi [Gauge] (0 Mpa).

Start the emergency COOL operation.

Disconnect the power supply plug and/or turn off the breaker.

After 15 seconds, connect the power supply plug and/or turn on the breaker, and then press the E.O. SW once.

Fully close the stop valve on the gas pipe side of the outdoor unit when the pressure gauge shows (0.1 to 0 psi [Gauge] (0.05 to 0 Mpa)).

Insert power supply plug into the power outlet and/or turn on the breaker

Press the E.O. SW to perform a test run for 30 minutes

Inspect the indoor/outdoor unit connecting wire (A) if the upper lamp blinks every 0.5 seconds

Verify emergency COOL mode starts after test run

Press the E.O. SW several times until all LED lamps turn off to stop operation

Remove service port caps from stop valves on both sides of refrigerant lines

Connect gauge manifold to ports of stop valves

Ensure valve core is in closed position before attaching control valve to service port

Tighten part A after ensuring valve core is closed

Avoid tightening part A or turning the body when valve core is open

Evacuate the system to 4000 microns from both service valves

Ensure the drain hose of the unit is not cut.

Wrap the extension drain hose with insulation if it passes through a room.

Ensure the drain hose points downward for easy drainage.

Connect the provided drain hose with a field-supplied drain hose if it is too short.

Insert the drain hose securely into a hard vinyl chloride pipe when connecting.

Ensure no stress is applied to the connecting portion of the drain hose after installation.