1
1-11-2-1-4
3. Repairs to sealed components
•
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.
•
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 affected. This shall include damage to cables, excessive number of
connections, terminals not made to original speci
fi
cation, damage to seals, incorrect
fi
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
fl
ammable atmospheres.
•
Replacement parts shall be in accordance with the
manufacturer’s speci
fi
cations.
- 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.
NOTE:
4. Repair 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
fl
ammable atmosphere.
•
The test apparatus shall be at the correct rating.
•
Replace components only with parts speci
fi
ed by the manufacturer. Unspeci
fi
ed parts by manufacturer may result
ignition of refrigerant in the atmosphere from a leak.
5. 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.
6. Detection of
fl
ammable refrigerants
•
Under no circumstances shall potential sources of ignition be used in the searching or detection of refrigerant leaks.
•
A halide torch (or any other detector using a naked
fl
ame) shall not be used.
•
The following leak detection methods are deemed acceptable for all refrigerant systems.
- No leaks shall be detected when using detection equipment with a sensitivity of 5 grams per year of refrigerant
or better under a pressure of at least 0,25 times the maximum allowable pressure (>1.04MPa, max 4.15MPa) for
example, a universal sniffer.
- Electronic leak detectors may be used to detect
fl
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.
- 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 con
fi
rmed.
- Leak detection
fl
uids are also suitable for use with most refrigerants, for example, bubble method and
fl
uorescent
method agents. 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
fl
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 off valves) in a part of the system remote from the leak. The precautions in #7 must
be followed to remove the refrigerant.
7. 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
fl
ammability is a consideration.
The following procedure shall be adhered to:
SM830283-00_欧州向け R32シングル36-71形TD&SM.indb 4
20/01/30 10:25:58
Содержание S-3650PF3E
Страница 20: ...19 MEMO SM830283 00_欧州向け R32シングル36 71形TD SM indb 19 2020 01 29 21 46 03 ...
Страница 178: ... MEMO 1 13 5 SM830283 00_欧州向け R32シングル36 71形TD SM indb 5 20 01 30 10 26 09 ...
Страница 198: ... MEMO 2 4 1 3 SM830283 00_欧州向け R32シングル36 71形TD SM indb 3 2020 01 29 19 52 20 ...
Страница 204: ... MEMO 3 2 1 3 SM830283 00_欧州向け R32シングル36 71形TD SM indb 3 20 01 28 11 25 46 ...
Страница 270: ... MEMO 5 4 3 SM830283 00_欧州向け R32シングル36 71形TD SM indb 3 2020 01 29 21 17 57 ...
Страница 272: ... MEMO 6 1 SM830283 00_欧州向け R32シングル36 71形TD SM indb 1 20 01 20 10 15 08 ...
Страница 294: ... MEMO 7 21 SM830283 00_欧州向け R32シングル36 71形TD SM indb 21 20 01 28 11 22 25 ...
Страница 321: ...202001 SM830283 00_欧州向け R32シングル36 71形TD SM indb 1 20 01 23 9 32 11 ...