Gree GSY09BXAE User Manual page 47

Specialist's Manual
are constructed of materials which are inherently
resistant to being corroded or are suitably protect-
ed against being so corroded.
Checks to electrical devices
●
Repair 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 immedi-
ately 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:
- that capacitors are discharged: this shall be done
in a safe manner to avoid possibility of sparking;
- that no live electrical components and wiring are
exposed while charging, recovering or purging the
system;
- that there is continuity of earth bonding.
● No ignition sources
No person carrying out work in relation to a refriger-
ating system which involves exposing any pipe
work shall use any sources of ignition in such a
manner that it may lead to the risk of fire or
explosion. All possible ignition sources, including
cigarette smoking, should be kept sufficiently far
away from the site of installation, repairing, remov-
ing and disposal, during which refrigerant can
possibly be released to the surrounding space.
Prior to work taking place, the area around the
equipment is to be surveyed to make sure that
there are no flammable hazards or ignition risks.
''No Smoking'' signs shall be displayed.
Repairs to sealed components
●
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 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.
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 the apparatus is mounted securely.
– Ensure that seals or sealing materials have not de-
graded to the point that they no longer serve the pur-
pose of preventing the ingress of flammable atmos-
pheres. Replacement parts shall be in accordance
with the manufacturer's specifications.
NOTE:The use of silicon sealant can inhibit the
effectiveness of some types of leak detection equi-
pment. Intrinsically safe components do not have to
be isolated prior to working on them.
● Repair to intrinsically safe components
Do not apply any permanent inductive or capaci-
tance 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 fl-
ammable 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.
Cabling
●
Check that cabling will not be subject to wear, cor-
rosion, 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.
Leak detection methods
●
Leak detection fluids are suitable for use with most
refrigerants but the use of detergents containing ch-
lorine shall be avoided as the chlorine may react
with the refrigerant and corrode the copper pipe-work.
● Detection of flammable refrigerants
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 detec-
tor using a naked flame) shall not be used.
The following leak detection methods are deemed
acceptable for all refrigerant systems.
Electronic leak detectors may be used to detect re-
frigerant leaks but, in the case of flammable refrige-
rants, 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 equip-
ment shall be set at a percentage of the LFL of the
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