20
5995432258
2 STAGE VACUUM
PUMP
Evacuating and Recharging Connections
Figure
E4
HEATED
CHARGING
CYLINDER
GAGE
MANIFOLD
PRESSURE
GAUGE
COMPOUND
GAUGE
HAND SHUTOFF
VALVE
TEE
FITTING
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CONDENSER
COMPRESSOR
FILTER
DRIER
PROCESS TUBE
ADAPTERS
HOT
TUBE
Refrigerant leaks
A system with R-134a and Ester oil will become
saturated with moisture much faster than a system with
R-12 and mineral oil. The compressor in an R-134a system
will have to be replaced if the product has had a low side
leak.
R-134a refrigerant molecules are smaller than R-12
molecules. This means that R-134a will pass more minor
leaks and the rate of flow will be greater than for R-12.
Therefore, it is now more important than ever to follow
good brazing practices. Use a good grade of silver solder.
45% silver solder is recommended.
leak detection
R-134a system leaks can be pinpointed by means of
an electronic leak detector or by bubble solution.
Electronic leak detectors for R-134a service are
currently available from several manufacturers. The least
expensive models are non-selective detectors that will
detect any type of emission or vapor present, regardless of
its chemical composition. Some non-selective detectors
designed for use with R-12 may have a much lower
sensitivity when used with R-134a. However, newly
designed detectors with good R-134a sensitivity are now
available. Be sure to consult with the manufacturer before
selecting or using a non-selective detector with R-134a.
Halogen-specific detectors use a specialized sensor
that allows detection of compounds containing chlorine,
fluorine, bromine, and iodine without being activiated by
other species. The major advantage of this type of detector
is a reduction in the number of “nuisance alarms”.
Halogen-specific detectors are generally more expensive
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than non-selective detectors but feature higher
sensitivity.R-134a properties
R-134a properties
The properties of R-134a are very similar to those of
R12. The principal data for the two refrigerants are shown
in the chart below.
Содержание Built-In Dishwasher
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Страница 13: ...13 5995432258 Refrigeration System Refrigeration Components ...
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Страница 30: ...30 5995432258 Connector Description ...
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