cecotec BIGDRY 9000 PROFESSIONAL CONNECTED Bedienungsanleitung Seite 25

ENGLISH
1.8. Verification of refrigeration equipment
When electrical components are replaced, they must be fit for purpose and to the correct
specification. The manufacturer's maintenance and service guidelines must be followed at all
times. In case of doubt, refer to the manufacturer's technical department for assistance.
The following checks must be applied to installations using flammable refrigerants:
- The load size is in accordance with the size of the room where refrigerant-containing parts
are installed.
- Ventilation machinery and outlets can be properly operated and are unobstructed.
- If an indirect cooling circuit is used, the secondary circuit must be checked for refrigerant
presence.
- Equipment marking remains visible and legible. Illegible markings and symbols should be
corrected.
- The components or refrigerant piping are installed in a position where they are not
susceptible to exposure to any substance that may corrode the refrigerant-containing
components, unless the components are made of materials that are inherently resistant
to corrosion or are properly protected against it.
1.9. Verification of electrical devices
Repair and maintenance of electrical components should include initial safety checks and
component-inspection procedures. If there is a fault that may compromise safety, then no
power supply should be connected to the circuit until the fault is satisfactorily dealt with. If
the fault cannot be corrected immediately, but continued operation is necessary, a suitable
temporary solution must be used. This should be reported to the owner of the equipment so
as to inform all parties.
During initial safety checks, make sure
- that capacitors are unloaded–this must be done in a safe manner to avoid sparks;
- that no live wiring or electrical components are exposed while loading, recovering, or
purging the system;
- that there is continuity in the earth connection.
2. Repair of sealed components
- During the repair of sealed components, all power supplies should be disconnected from
the equipment being worked on prior to any removal of sealed covers, etc. If it is absolutely
necessary to have a power supply to the equipment during service, then a permanently
operating form of leak detection should be placed at the most critical point to warn of a
potentially hazardous situation.
- Particular attention must be paid to the following to ensure that, when working on electrical
components, the housing is not altered in such a way as to affect safety. This must include
damage to cords, an excessive number of connections, terminals not conforming to the
initial specification, damage to seals, incorrect fitting of the stuffing box, etc.
- Ensure that the instrumentation is securely mounted.
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- Ensure that seals or sealing materials have not degraded until no longer being useful to
preventing the penetration of flammable atmospheres. Spare parts must be in accordance
with the manufacturer's specifications.
NOTE:
the use of silicone sealant may inhibit the effectiveness of some types of leak-
detection equipment. Intrinsically safe components do not have to be isolated before work.
3. Repair of intrinsically safe components
- Do not apply any permanent inductive or capacitive load to the circuit without ensuring
that it will not exceed the permissible voltage and current rating for the equipment in use.
- Intrinsically safe components are the only type of components that can be worked on
in a flammable atmosphere. The test instrumentation must have the correct assigned
features.
- Replace components only with parts specified by the manufacturer. Other parts can ignite
the refrigerant in the atmosphere from a leak.
4. Wiring
Verify that the wiring is not subject to wear, corrosion, excessive pressure, vibration, sharp
edges, or any other environmental effects. The effects of ageing or continuous vibration from
sources such as compressors or fans should also be taken into account.
5. Detection of flammable refrigerants
Under no circumstances should potential ignition sources be used in the search for or detection
of refrigerant leaks. Do not use a halide lamp or any other detector using a naked flame.
6. Leak-detection methods
- The following leak-detection methods are considered acceptable for systems containing
flammable refrigerants.
- Electronic leak detectors should be used to detect flammable refrigerants, but the
sensitivity may not be adequate, or may need recalibration (the detection equipment should
be calibrated in a refrigerant-free area). Ensure that the detector is not a potential ignition
source and that it is suitable for the refrigerant used. The leak-detection equipment must
be set to a percentage of the lower flammability limit of the refrigerant and calibrated for
the refrigerant used with the appropriate percentage of gas (maximum 25%) confirmed.
- Leak-detection fluids are suitable for use with most refrigerants, but the use of detergents
containing chlorine must be avoided, as chlorine can react with the refrigerant and corrode
copper pipes.
- If a leak is suspected, all naked flames must be eliminated/extinguished.
- If a refrigerant leak is found and requires brazing, all refrigerants must be recovered from
the system, or isolated (by means of shut-off valves) in a part of the system far away from
the leak. Oxygen-free nitrogen must then be purged through the system both before and
during the brazing process.
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