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Replace components only with parts specified by the manufacturer.

Other parts may result in the ignition of refrigerant in the atmosphere from a leak.

9. Cabling

Check that cabling will not be subject to wear, corrosion, excessive pressure,

vibration, sharp edges or any other adverse environmental effects.

The check shall also consider the effects of aging or continual vibration from sources

such as compressors or fans.

10. Detection of flammable 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 flame) shall not be used.

11. Leak detection methods

The following leak detection methods are deemed acceptable for systems containing

flammable refrigerants:

–

Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity may

not be adequate, or may need re-calibration. (Detection

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 employed and the appropriate percentage of gas (25 %

maximum) is confirmed.

–

Leak detection fluids 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 flames shall be removed/ extinguished.

–

If a leakage of refrigerant is found which requires brazing, all the refrigerant shall be recovered

from the system, or isolated (by means of shut

off valves) in a part of the system remote from the leak.

–

Oxygen free nitrogen (OFN) shall then be purged through the system both before and during

the brazing process.

12. Removal and evacuation

When breaking into the refrigerant circuit to make repairs – or for any other purpose

– conventional procedures shall be used.

However, it is important that best practice is followed since flammability is a consideration.

The following procedure shall be adhered to:

–

Remove refrigerant;

–

Purge the circuit with inert gas;

–

Evacuate;

–

Purge again with inert gas;

–

Open the circuit by cutting or brazing.

CAUTION

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