McQuay MDS080BR Guía de instalación descargar pdf (Pagina 93)

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Design & installation Guide For McQuay MDS Multi System

Special vacuum drying

This vacuum drying way is used when there are some moisture in the copper pipe.

Operating sequence:

Vacuum drying: pumping the system for 2 hours;

Nitrogen charging: Charge the nitrogen to the pressure of 0.5kg/cm

;

As Nitrogen is a dried gas, so it can dry the system; but if the moisture is too much, maybe it can

not dry the system thoroughly. So when install the refrigerant piping, please be careful enough

to prevent the water coming into the pipe or the condensated water.

Vacuum drying one more time: pumping the system for 1 hours;if the pressure is less than

-75 mmHg, then it is OK; if it can not reach -75 mmHg, then it should go back to item 2, then

item 3;

Stop vacuum pumping and wait for 1 hour;

Additional refrigerant charging;

Open the vale to charge.

Please note that the gas must be nitrogen, if oxygen is used by mistake, it can result in explosion

-760

-700

-600

-400

-200

+0.5

kg/cm

Special vacuum drying

Vacuum Increase pressure



Refrigerant charging

Vacuum drying

Vacuum pump

Vacuum damage

(Barometric pressure)

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McQuay MDS080BR Guía de instalación Pagina 93