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Replace components only with parts specied by the manufacturer. Other
parts may result in the ignition of refrigerant in the atmosphere from a
leak.
Cabling
Check that cabling will not be subject to wear, corrosion, excessive pres-
sure, vibration, sharp edges or any other adverse environmental eects.
The check shall also take intoaccount the eects of aging or continual vi-
bration from sources such as compressors or fans.
Detection of ammable refrigerants
Under no circumstances shall potential sources of ignition be used in the
searching for or detection of refrigerant leaks. A halide torch (or any other
detector using a naked ame) shall not be used.
Leak detection methods
The following leak detection methods are deemed acceptable for systems
containing ammable refrigerants.
Electronic leak detectors shall be used to detect ammable refrigerants,
but the sensitivity may not be adequate, or may need re-calibration. (De-
tection equipment shall be calibrated in a refrigerant-free area.) Ensure
that the detector is not a potential source of ignition and is suitable for
the refrigerant used. Leak detection equipment shall be set at a percentage
of the LFL of the refrigerant and shall be calibrated to the refrigerant em-
ployed and the appropriate percentage of gas (25 % maximum) is con-
rmed.
Leak detection uids are suitable for use with most refrigerants but the
use of detergents containing chlorine shall be avoided as the chlorine may
react with the refrigerant and corrode the copper pipe-work.
If a leak is suspected, all naked ames shall be removed/ extinguished.
If a leakage of refrigerant is found which requires brazing, all of the re-
frigerant shall be recovered from the system, or isolated (by means of shut
o valves) in a part of the system remote from the leak. Oxygen free ni-
trogen (OFN) shall then be purged through the system both before and
during the brazing process.
Removal and evacuation
When breaking into the refrigerant circuit to make repairs or for any oth-
er purpose conventional procedures shall be used. However, it is import-
ant that best practice is followed since ammability is a consideration.
The following procedure shall be adhered to:
Remove refrigerant;
Purge the circuit with inert gas;
Evacuate;
Purge again with inert gas;
5. MAINTENANCE AND INSPECTION
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