49
REFRIGERANT LEAKS
A system with R-134a and Ester oil will become satur-
ated 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 activated by
other species. The major advantage of this type of
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.
S
T
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R
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G
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Evacuating and Recharging Connections
detector is a reduction in the number of “nuisance
alarms”. Halogen-specific detectors are generally more
expensive than non-selective detectors but feature higher
sensitivity.
Figure E4
Содержание BEVERAGE CENTER II
Страница 22: ......
Страница 33: ...32 COMPRESSORWIRING Induction Run Compressor with Relay LADDER SCHEMATIC ...
Страница 34: ...33 WIRING DIAGRAM ...
Страница 61: ...60 ...
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Страница 68: ...67 Step 3 Step 4 Step 5 Step 6 ...
Страница 69: ...68 Step 8 Step 7 Step 9 Step 10 ...
Страница 70: ...69 Ice Maker Exploded View ...
Страница 71: ...70 Ice Maker Wiring Diagrams Enlarged view ...
Страница 77: ......
