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Translation from original instructions

Packaged Rooftop

We reserve the right to make changes without any prior notice.

UATYA

4P645202-1

(Annex DD.5.2)

Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not

altered in such a way that the level of protection is a󰀨ected.

This shall include damage to cables, excessive number of connections, terminals not made to original specication,

damage to seals, incorrect tting of glands, etc.

Ensure that apparatus is mounted securely.

Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the

ingress of ammable atmospheres. Replacement parts shall be in accordance with the manufacturer’s specications.

(Annex DD.5) Repairs to intrinsically safe components

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 ammable

atmosphere. The test apparatus shall be at the correct rating.

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.

(Annex DD.7) Cabling

Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other

adverse environmental e󰀨ects. The check shall also take into account the e󰀨ects of ageing or continual vibration from

sources such as compressors or fans.

(Annex DD.8) 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.

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 (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.The leak detection system shall be set at

a percentage of the refrigerant LFL and it shall be calibrated to the refrigerant employed; the appropriate percentage

of gas (25% maximum) shall be 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.

Note. Examples of leak detection uids are:

• bubble method;

• uorescent method agents.

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 refrigerant shall be recovered from the system,

or isolated (by means of shut o󰀨 valves) in a part of the system remote from the leak. Removal of refrigerant shall be

according to Annex DD.9.