CLIVET WDAT-iZ4, Manual For Installation, Use And Maintenance

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8 MAINTENANCE
containing refrigerant, unless they are manufactured with material intrinsically resistant to corrosion or
suitably protected against corrosion.
Electrical device checks
The reparation and maintenance of electric components must include initial safety checks and component
inspection procedures.
In case of a fault that compromises safety, do not perform any electrical connection to the circuit until said
fault is suitably resolved.
If it is not possible to repair the fault immediately and electrical components need to remain functioning, a
temporary solution must be adopted. This must be reported to the owner of the equipment so as to keep
all parties informed.
Initial safety checks must include:
x
that condensers are emptied. This operation must be performed safely to avoid any sparks:
x
that electrical components and wiring are not exposed during the charging, recovering or venting phases;
x That the earth conductor is continuous.
Repairing sealed components
x
During the reparation operations of sealed components, disconnect all the equipment before removing
sealed casings etc. If, during operations, it is absolutely necessary for the equipment to remain
connected, a leak detection device must be placed in the most critical point so as to report any
potentially-dangerous situation.
x Pay particular attention to what follows to guarantee that, while intervening on electrical components, the
housing is not altered in a way so as to affect the level of protection. This includes damage to cables,
an excessive number of connections, terminals not compliance with the original specifications, damage to
gaskets, an unsuitable installation of gaskets, etc.
x
Make sure the device is installed safely.
x
Check that the seals or sealing materials are not altered in such a way that they no longer the impede
the entry of flammable environments. Spare parts must comply with manufacturer specifications.
NOTE:
Ÿ
Using silicone sealants may inhibit the effectiveness of a few types of leak detection equipment. It is not
necessary to isolate intrinsically safe components before performing operations on them.
Reparation of intrinsically safe components
Do not apply permanent inductive or capacitive loads to the circuit without making sure that they do not
exceed the admissible voltage and current allowed for equipment in use.
Intrinsically safe components are the only component type on which operations can be performed in a
flammable atmosphere. The testing device must show a correct value. Replace components only with the
parts specified by the manufacturer.
Following a leak, other parts could lead to the combustion of the refrigerant in the atmosphere.
Wires
Make sure wires are not subjected to wear, corrosion, excessive pressure or vibration, that there are no
sharp edges and that they do not produce other negative effects on the environment. The inspection must
also keep into consideration the effects of tine or the continuous vibration caused e.g. by compressors or
fans.
Detection of flammable refrigerants
Under no circumstance is it possible to use potential ignition sources to search or detect refrigerant leaks.
Do not use halide lights (or any other open flame detectors).
Leak detection methods
The following leak detection methods are considered acceptable for systems containing flammable
refrigerants. Electric leak detectors must always be used to identify flammable refrigerants, although they do
not present a suitable sensitivity level or require recalibration (detection equipment must be calibrated in an
area free from refrigerants).