4-15
R
Re
effrriig
ge
erra
attiio
on
n S
Sy
ys
stte
em
m
L
Le
ea
ak
k D
De
ette
ec
cttiio
on
n
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 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.
R
R--1
13
34
4a
a p
prro
op
pe
errttiie
es
s
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.
REFRI
G
ERANT
S
R-12
R-134a
NAME
Dichlorodifluoro-
methane
1,1,1,2--Tetra-
fluoromethane
Formula
CCI
2
F
2
CH
2
F-CF
3
Molecular Weight (g/mol)
120.93
102.3
Ozone Depletion Potential
(ODP)
1
0
G
lobal Warming Potential
(
G
WP)
3.1
0.3
Boiling Point °F
-21.6
-15.7
Vapor Pre
ss
ure (77°F)
80 p
s
ig
82 p
s
ig
Flammability
None
None
S
olubility of Water in
Refrigerant (wt% @ 77°F)
0.009
0.11
Содержание EILFU17GS
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