Swegon BlueBox Tau SKY Hi HP Instructions For Installation, Use And Maintenance Manual page 17

(Annex DD.5.2)
Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not alte-
red in such a way that the level of protection is affected.
This shall include damage to cables, excessive number of connections, terminals not made to original specification, dama-
ge to seals, incorrect fitting 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 flammable atmospheres. Replacement parts shall be in accordance with the manufacturer's specifications.
(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 per-
missible 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 atmosphe-
re. 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.
(Annex DD.7) 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 ageing or continual vibration from sources such
as compressors or fans.
(Annex DD.8) 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.
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 avoi-
ded as the chlorine may react with the refrigerant and corrode the copper pipe-work.
Note. Examples of leak detection fluids are:
• bubble method;
• fluorescent method agents.
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 iso-
lated (by means of shut off valves) in a part of the system remote from the leak. Removal of refrigerant shall be according
to Annex DD.9.
We reserve the right to make changes without any prior notice. Translation from original instructions
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