Hantech 10474165 Bedienungsanleitungen Seite 15

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.
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 isabsolutely
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
affected. 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 effectiveness of some
types of leak detection equipment.
Intrinsically safe components do not
have to be isolated prior to working on
them.
3. 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.
4. 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.
5. Detection of flammable refrigerant
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.
6. Leak detection methods
The following leak detection methods
are deemed acceptable for systems
containing flammable refrigerants.
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