Mitsubishi Air Conditioner MUY-GS15NA

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

Are the stop valves fully closed?

Connect gauge manifold to ports of stop valves

Ensure control valve precautions are followed

Is the valve core in closed position before tightening part A?

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

Select the operation mode for test run

Is the upper lamp blinking every 0.5 seconds?

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

Ensure emergency COOL mode (75°F [24°C] COOL) starts after test run.

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.

Securely insert the drain hose into a hard vinyl chloride pipe when connecting.

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

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.

Monitor the pressure gauge until it shows (0.1 to 0 psi [Gauge] (0.05 to 0 Mpa)).

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