Electrolux FAC124P1A Instruções de Operação descarregar pdf (Página 127)

Section 6 Sealed System

6-13

Vacuum Pump Maintenance

It is absolutely essential to maintain your vacuum pump

according to the manufacturer’s instructions, including

required oil changes at the recommended intervals.

Vacuum pump oil should always be changed after

evacuating a contaminated system. Vacuum pump

performance should be checked periodically with a

micron gauge.

Vacuum pump suppliers may or may not recommend

changing the vacuum pump oil to the same type that’s

in the system being evacuated. Some manufacturers

may recommend a vacuum pump that’s dedicated to

R-22 systems.

Robinair has stated that their current and discontinued

vacuum pump models, using mineral oil currently

specified for use in their vacuum pumps, can be used to

evacuate R-22 systems.

For other brands of vacuum pumps, check with the

manufacturer for restrictions and guidelines when using

with R-22.

If you use a vacuum pump with mineral oil to

evacuate an R-22 system, it is ABSOLUTELY

ESSENTIAL to have a shut-off valve between

pump and your manifold gauge set. The

hand valve must be closed during all times

when vacuum pump is not operating. This

will prevent migration of mineral oil vapor

into R-22 oil systems. If the vacuum pump

should stop during evacuation for any reason,

the hand pump shut-off valve must be closed

immediately.

To achieve the required 29.9 inch (500 micron) vacuum,

a properly maintained two-stage vacuum pump in good

condition is required. A two stage pump can reach a

deeper vacuum than a single stage because the exhaust

from the first pumping stage is discharged into the

second pumping stage. This means the second stage

begins pumping at a lower pressure so a lower ultimate

vacuum can be achieved.

VACUUM CHART

Vacuum

Inches Hg.

Microns

Boiling Point

of Water °F

28.940 25000 77.9

29.530 10000 52.0

29.832 4600 32.0

29.882 1000 1.0

29.901 500 -11.2

29.915 150 -32.8

29.917 100 -38.2

29.919 50 -49.0

Figure 6-6. Two Stage Vacuum Pump

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 139 140

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