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Important Safety Information
READ AND FOLLOW ALL SAFETY INSTRUCTIONS
Sealed electrical components shall be replaced
1. During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being
worked upon prior to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply
to equipment during servicing then a permanently operating form of leak detection shall be located at the most
critical point to warn of a potentially hazardous situation.
2. To ensure that by working on electrical components the casing is not altered in such a way that the level of
protection is affected, particular attention shall be paid to the following:
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Damage to cables, excessive number of connections, terminals not made to original specification, damage to
seals, incorrect fitting of glands, etc.
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Ensure the apparatus is mounted securely.
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Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of
preventing the ingress of flammable atmospheres. Replacement parts shall be in accordance with the
manufacturer's specifications.
Note: The use of silicon sealant may inhibit the effectiveness of some types of leak detection equipment. Intrinsically
safe components do not have to be isolated prior to working on them.
Intrinsically safe components must be replaced
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed
the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only
types that can be worked on while live in the presence of a flammable atmosphere. The test apparatus shall be at
the correct rating. Replace components only with parts specified 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 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.
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.
Leak detection methods
The following leak detection methods are deemed acceptable for systems containing flammable refrigerants:
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Electronic leak detectors shall be used to detect flammable refrigerants but the sensitivity may not be adequate
or may need recalibration. 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.
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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.
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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 or pipe-work.
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If a leak is suspected, all naked flames shall be removed or extinguished.
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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. Removal of
refrigerant shall be according to Removal and evacuation.
SAVE THESE INSTRUCTIONS!
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