Handleiding
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7. Repairs to sealed components
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) 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
aected. This shall include damage to cables, excessive
number of connections, terminals not made to original
specification, damage 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.
NOTE: The use of silicon sealant may inhibit the eectiveness
of some types of leak detection equipment. Intrinsically safe
components do not have to be isolated prior to working on
them.
8. 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 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.
9. Cabling
Check that cabling will not be subject to wear, corrosion,
excessive pressure, vibration, sharp edges or any other
adverse environmental eects. The check shall also take
into account the eects of aging or continual vibration
from sources such as compressors or fans.
10. 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.
11. Leak detection methods
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 o 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.
1514
GB
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Productinformatie
| Merk | Point |
| Model | POAC8212 |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 9076 MB |
