R and V Works FF6 Technické informace stáhnout pdf (Strana 64)

Compressor Application Manual

• Due to the sensitivity of the ester oils used in

R 134a compressors, the following

recommendations are necessary (which also

apply to any other refrigerant):

• It is recommended that one system only be

connected to each vacuum pump;

• It is recommended that a vacuum be made on

both sides of the system, with the vacuum level

below 0.6 mbar (500 μm Hg);

• It is preferable that the vacuum pumps

be installed at the same level or below

the compressor;

• Use hoses as short and with as large a

diameter as possible;

• The vacuum level must be measured in the

refrigeration system and not in the pump;

• Use R 141b or VERTREL XF as a removal

agent for cleaning the systems;

• Refrigerant charging and vacuum equipment

must be for the exclusive use of R 134a, to

prevent contamination by chlorine residues;

• The halogen leak detectors currently used in

R 12 system are not efficient for R 134a. This

kind of leak detector reacts with chlorine, a

halogen, which is missing from R134a. This is

why it is recommendable to use equipment

with helium-based detectors.

Compact electronic leak detectors compatible

with R 134a refrigerant are available in

the market;

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R and V Works FF6 Technické informace Strana 64