MICRO-AIR Artic Air 24 Guía de instalación descargar pdf (Pagina 40)

Solution for Method #2

The bottom line is that it is not possible to reliably detect small system leaks by only looking for a

change in system pressure over time. Monitoring pressure drop can be helpful in identifying

leaks - particularly large ones but DO NOT use this as your only leak checking method.

Finishing Up

When you are confident that there are no leaks in the system, slowly release the pressure.

Again this done from both the high and low side simultaneously. Leave the gauge set in place as

it will be used to evacuate the system.

Evacuating And Charging

Once the system has been thoroughly leak checked, it is time to evacuate the system. This

process removes not only air (and residual nitrogen) from the system, but moisture as well. It is

important to use a high-quality two-stage refrigeration vacuum pump and to ensure that the

pump has clean, fresh oil. Old and/or contaminated oil in a vacuum pump prevents the pump

from achieving the high level of vacuum required to properly dehydrate the system. The pump

should be capable of evacuating to a level of 150 microns or greater.

Begin Evacuating

At this point, you should have the gauge set connected to the access ports on both discharge

and suction Rotalock valves. EVACUATION MUST BE DONE FROM BOTH THE SUCTION

AND DISCHARGE PORT SIMULTANEOUSLY. The valve stems on the Rotalock valve should

still be in the fully front-seated position and will remain there for the duration of the evacuation.

Fully open both hand valves on the gauge set and turn on the vacuum pump. You should see

the needles on both gauges quickly pull below "0" and, with continued evacuating soon indicate

29 - 30 inches. Failure to reach this vacuum indicates either a defective vacuum pump or a

severe system leak.

To completely dehydrate the system the vacuum pump must be left running for an extended

period of time. How long depends on the ambient temperature since heat tends to “boil off”

moisture more quickly. The following table assumes use of a high-quality two-stage vacuum

pump.

Ambient Temperature Recommended Evacuation Time

F / 32

C 15 minutes

F / 27

C 30 minutes

F / 21

C 1 Hour

F / 18

C 2 Hour

F / 15

C 4 Hours

F / 10

C 8 Hours

If a system must be evacuated at temperatures below 50

F/10

C, it is helpful to heat up the

tubing and components. Use a safe and gentle heat source such as incandescent lamps and/or

electric room heaters.

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