In Case Of A Refrigerant Leak - Mitsubishi Electric MXZ-18NV Service Manual

Inverter-controlled multi system split-type, heat pump air conditioners

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MXZ-32NV -

For details about how to use manifold valves, see the instruction manual for manifold valves.

The valve knob Hi below cannot operate during the following work if it is fully closed.

Warning : When installing or moving the unit, do not mix anything other than specified refrigerant (R-22) into the

refrigerating cycle.

If air is mixed, it may cause the refrigerating cycle to get abnormally high temperature, causing a risk of

burst.

Make sure the pipes are connected securely.

Connect the projected side (on which the setting pin is pressed) of the gauge manifold valve´s charge hose to the

stop valve´s service port (gas pipe side).

Make sure the stop valves of gas and liquid pipes are fully closed, and connect the charge house to the vacuum

pump.

Fully open the manifold valve´s valve knob Lo and operate the vacuum pump.

Loosen the stop valve flare nut on the gas pipe side a little bit and make sure that air is entering.

Then tighten the flare nut not to enter the air. After that, make sure that the charge hose is connected firmly to

the service port.

Purge air for more than 15 minutes, and make sure the compound gauge is reading - 1.01

After purging air, fully close the manifold valve´s valve knob Lo and stop operating the vacuum pump.

Leave the situation for about 1 to 2 minutes, make sure the needle of the compound gauge does not return, pull the

stop valve´s knob toward you, and fully open the stop valve by turning it a quarter turn counterclockwise.

Quickly remove the gauge manifold valve´s charge hose from the stop valve´s service port.

Tighten the service port cap 1/12 turn more from where the tightening torque is suddenly increased.

(It is equivalent to a tightening torque of 13.7 to 17.7N-m (140 to 180kgf-cm).)

Tighten the service port cap 1/12 turn more from where the tightening torque is suddenly increased.

(It is equivalent to a tightening torque of 19.6 to 29.4N-m (200 to 300kgf-cm).)

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Leak test

With a gas detector or soap water, check the flared nut connections for any refrigerant leak.