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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
1.4
Investigating leaks
⇒ “1.4.1 General information about investigating leaks in the re‐
frigerant circuit”, page 68
⇒ “1.4.2 Searching for leaks in refrigerant circuits using an elec‐
tronic leak detector”, page 69
⇒ “1.4.3 Searching for leaks with UV leak detection system”, page
71
⇒ “1.4.4 Detecting leaks in a vacuum test using air conditioner
service station , or in a pressure test”, page 77
⇒ “1.4.5 Detecting leaks in a pressure test (with nitrogen or com‐
pressed air)”, page 77
1.4.1
General information about investigating
leaks in the refrigerant circuit
Note
♦ Small leaks can be detected with e.g. an electronic leak de‐
tector or a UV leak detector lamp.
♦ This workshop manual describes 2 ways of tracing leaks in
refrigerant circuits. These procedures have been tested and
lead to a reliable result under the different usage conditions if
they are performed correctly and in accordance with the spe‐
cific complaint.
♦ Various methods are offered in the open market with which
leaks in refrigerant circuits can be traced. These methods are
not able to provide clear results in all cases and, unless the
exact procedure is adhered to, they can also result in various
components of the refrigerant circuit being identified as having
leaks even though they do not. Furthermore, certain process‐
es can cause preliminary or permanent damage to the com‐
ponents of the refrigerant circuit
♦ Components that are found to be leaking must not be repaired.
They must be renewed instead.
♦ A leaking refrigerant circuit must not be charged with refriger‐
ant. Therefore, evacuate an empty refrigerant circuit and
check for leaks before charging the system with refrigerant
⇒ “2.5 Evacuating refrigerant circuit”, page 140 .
68
Rep. gr.87 - Air conditioning system
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