R and V Works FF6 Informations techniques télécharger pdf (Page 44)

Compressor Application Manual

At the other end of this tube, install a fast coupling or

similar register to make the vacuum and gas charge.

6 - Caution with Vacuum

and Refrigerant Fluid Charge

NeverNever

Never use the new compressor as a vacuum

pump. It may absorb dirt and water from the tubes,

which will be detrimental to its operation and

working life.

7 - Vacuum Pump

A - Always use a high vacuum pump;

B - Whenever possible, make a vacuum on the

high and low side;

C - Use a hose exclusively for each refrigerant:

one for R 134a and another for each of the

other refrigerants

D - Apply a vacuum until 500 μm Hg

(29.90" Hg), never less than 20 minutes

at this level;

E - It is recommendable to install a check valve at

the inlet of the vacuum pump.

8 - Refrigerant Fluid Charge

In domestic refrigeration systems as with most

work with little refrigerant fluid less than 350 g

(12.35 ounces) - and use a capillary tube as a control

element, the performance of the refrigeration system

will very much depend on the refrigerant fluid charge

used. Now, with alternative refrigerant fluids, it is even

more important to proceed correctly and use proper

equipment for this operation.

Example: a system with an internal volume of

280-300 liters normally operates with 90-120 grams

(3.2-4.2 ounces) of R 12 refrigerant.

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R and V Works FF6 Informations techniques Page 44