Johnson Estate, Инструкция по эксплуатации

Страница: 60 / 68

60
If an indirect refrigerant circuit is used, the secondary circuit must be checked for the
presence of refrigerant.
The marking on the equipment continues to be visible and legible. Illegible markings
and signs must be corrected.
Refrigeration pipes or components are installed in a location where they are unlikely to
be exposed to any substance that will corrode the refrigerant-containing components,
unless the components are constructed of intrinsically corrosion-resistant materials or
are adequately protected against such corrosion.
Checks to electrical devices
Repair and maintenance of electrical components must include initial safety checks and
component inspection procedures. If there is a fault that could compromise safety, no
electrical supply should be connected to the circuit until it is satisfactorily resolved. If
the fault cannot be remedied immediately but it is necessary to continue operation,
a suitable interim solution must be used. This must be reported to the owner of the
equipment so that all parties are informed.
Initial security checks should include:
That the capacitors are discharged: this must be done safely to avoid the possibility of
sparks.
That no electrical components and wiring are exposed when charging, restoring, or
purging the system.
That there is continuity of the link with the earth.
Repairs on sealed components
During repairs to sealed components, all power supplies must be disconnected from the
equipment being worked on before removing the sealed covers, etc. If it is absolutely
necessary to have an electrical power supply to the equipment during maintenance,
then a permanently functional form of leakage must be positioned at the most critical
point to warn of a potentially dangerous situation.
Particular attention must be paid to the following to ensure that, by operating on the
electrical components, the casing is not altered in such a way as to affect the level of
protection. This includes damage to cables, excessive number of connections, terminals
not made to original specification, damage to gaskets, incorrect assembly of cable glan-
ds, etc. Make sure that the device is securely mounted.
Make sure that the gaskets of the sealing materials have not deteriorated in such a way
that they no longer serve the purpose of preventing the entry of flammable atmosphe-
res.
Replacement parts must conform to the manufacturer’s specifications.
NOTE: the use of silicone sealant can inhibit the effectiveness of some types of leak
detection equipment. Intrinsically safe components do not need to be isolated before
working on them.
Repair of intrinsically safe components
Do not apply permanent inductive or capacitive loads to the circuit without making sure
that it does not exceed the voltage and current allowed for the equipment in use.
The intrinsically safe components are the only ones on which it is possible to work in
the presence of a flammable atmosphere. The test equipment must be of the correct
evaluation.
Replace components only with parts specified by the manufacturer. Other parts can
cause the ignition of the refrigerant in the atmosphere due to a leak.
Wiring
Verify that the wiring is not subject to wear, corrosion, excessive pressure, vibration,
sharp edges, or other adverse environmental effects. The verification must also take
into account the effects of aging or continuous vibrations from sources such as com-