Manual Inventum AC907W (page 35 of 100) (English, German, Dutch, French)

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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 (Annex DD.6)

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 take into

account the effects of aging or continual vibration from sources such as compressors

or fans.

10. Detection of ﬂammable refrigerants (Annex DD.7)

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 (Annex DD.8)

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 of 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 (Annex DD.9)

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.

The refrigerant charge shall be recovered into the correct recovery cylinders. The

system shall be “ﬂushed” with OFN to render the unit safe. This process may need to

be repeated several times. Compressed air or oxygen shall not be used for this task.

English • 35

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Inventum AC907W Manual

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