Kunft KAC4254 Manual De Instrucciones página 9

If in doubt, consult the manufacturer's technical department for as-
sistance. The following checks shall be applied to installations using
flammable refrigerants:
• the charge size is in accordance with the room size within which the
refrigerant containing parts are installed;
• the ventilation machinery and outlets are operating adequately and
are not obstructed;
• if an indirect refrigerating circuit is being used, the secondary
circuits shall be checked for the presence of refrigerant; marking to
the equipment continues to be visible and legible.
• marking and signs that are illegible shall be corrected;
• refrigeration pipe or components are installed in a position
where they are unlikely to be exposed to any substance which
may corrode refrigerant containing components, unless the
components are constructed of materials which are inherently
resistant to being corroded or are suitably protected against being
so corroded.
9. Checks to electrical devices
Repair and maintenance to electrical components shall include
initial safety checks and component inspection procedures. If a
fault exists that could compromise safety, then no electrical supply
shall be connected to the circuit until it is satisfactorily dealt with.
If the fault cannot be corrected immediately but it is necessary to
continue operation, and adequate temporary solution shall be used.
This shall be reported to the owner of the equipment, so all parties
are advised.
Initial safety checks shall include:
• that capacitors are discharged: this shall be done in a safe manner
to avoid possibility of sparking
• that there no live electrical components and wiring are exposed
while charging, recovering or purging the system;
• that there is continuity of earth bonding.
10. Repairs to sealed components
10.1 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.
10.2 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 affected. This shall
include damage to cables, excessive number of connections,
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portable air conditioner
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 in such
a way 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.
11. 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.
12. 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.
13. Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used
when in the search for or detection of refrigerant leaks. A halide torch
(or any other detector using a naked flame) shall not be used.
14. 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. 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.
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EN
KAC4254