Qlima D 720 Cube Gebrauchsanweisung Seite 72

9) Checks to electrical devices
7. REPAIRS TO SEALED COMPONENTS
1) D uring repairs to sealed components, all electrical supplies shall be disconnected
2) P articular attention shall be paid to the following to ensure that by working
8. REPAIR TO INTRINSICALLY SAFE COMPONENTS
D o 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.
9. CABLING
C heck 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.
10. DETECTION OF FLAMMABLE REFRIGERANTS
U nder 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.
11. LEAK DETECTION METHODS
T he 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 used. 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
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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.
R epair 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, an 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:
T hat capacitors are discharged: this shall be done in a safe manner to avoid
possibility of sparking;
T hat there no live electrical components and wiring are exposed while
charging, recovering or purging the system; That there is continuity of earth
bonding.
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.
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.
N OTE: 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.