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TP00952

November 26, 2001 29

SYSTEM EVACUATION & RECHARGING

Should service work ever be required on a product where the sealed refrigeration is opened for any rea-

son, the refrigerant must be recovered, drier/filter replaced, evacuated and recharged. The old method of

“purging” is NOT ACCEPTABLE. Always evacuate the system through both the high and low side service

valves. Be certain both valves are completely open when evacuating and the drier/filter has been re-

placed.

SELF-CONTAINED PRODUCTS

With the new POE [Polyol Ester] oils, the refrigeration system is more prone to moisture problems than

the CFC systems. Every effort should be made to never have the system open to the atmosphere for

longer than 15 minutes, and the replacement of the drier/filter is no longer an option, [IT IS MANDATO-

RY].

A good vacuum is not always easy to measure, however the goal is to have less then 1% non-condens-

ible vapors in the system at the completion of the evacuation. Basic guidelines with a good pump would

be to evacuate a self–contained product 30 to 45 minutes and a remote product no less than 60 minutes.

The system should be evacuated to approximately 200/250 microns. Then perform a 5 minute holding

test. You may expect a low grade loss of the vacuum as normal. However, a rapid rise to normal atmo-

spheric pressure would signal a system leak is present and must be located and repaired before recharg-

ing the product. A slower pressure rise to approximately 1500 microns would signal moisture still present

in the refrigeration system.

On a “WET” system, it would be beneficial to use heat lamps to raise the temperature of the compressor

dome and evaporator surface area during the evacuation.

To assure a properly recharged product, the refrigerant charge must be weighed into the product using an

electronic charging scale or dial-a-charge. On air- and water-cooled products the charge should be

introduced into the high side service valve. On remote systems, the charge should be introduced into the

product receiver.

MANIFOLD SET

OPEN

VACUUM

PUMP

ELECTRONIC

SCALE

CHARGING

CYLINDER

CLOSED

LOW SIDE

SERVICE

VA LV E

HIGH SIDE

SERVICE

VA LV E

OPEN

MANIFOLD SET

OPEN

VACUUM

PUMP

ELECTRONIC

SCALE

CHARGING

CYLINDER

CLOSED

LOW SIDE

SERVICE

VA LV E

HIGH SIDE

SERVICE

VA LV E

OPEN

CLOSED

FIGURE 14

IMPORTANT: Service personnel are held responsible for all aspects of the clean air act of July,

1992.

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