Mitsubishi Air Conditioner MUZ-GS15NAHZ

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 indoor unit's 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.

Ensure the air conditioner is turned off before starting the procedure.

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.

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.

Ensure service port caps are removed from stop valves on both sides of refrigerant lines

Connect gauge manifold to ports of stop valves

Is the valve core in closed position before attaching the control valve?

Tighten part A after ensuring valve core is closed

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

Insert power supply plug into the power outlet

Select test run mode by pressing the E.O. SW

Confirm test run duration is 30 minutes

Is the upper lamp blinking every 0.5 seconds?

Inspect the indoor/outdoor unit connecting wire (A) if lamp blinks