IRP U-SHAPE Series, Руководство пользователя

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Checking for presence of refrigerant.
The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is
aware of potentially toxic or flammable atmospheres. Ensure that the leak detection equipment being used is suitable
for use with all applicable refrigerants eg.: non-sparking, adequately sealed or intrinsically safe.
Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing
equipment shall be available to hand. Have a dry power or CO
2
fire extinguisher adjacent to the charging area.
No ignition sources
All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of
installation, repairing, removing 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 hazard
s or ignition risks. “No Smoking” signs shall be displayed.
Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any
hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should
safely disperse any released refrigerant and preferably expel it externally into the atmosphere.
Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all
times the manufacturer’s maintenance and service guidelines shall be followed. If in doubt, consult the manufacturer’s
technical department for assistance.
The following checks shall be applied to installations using FLAMMABLE REFRIGERANTS:
•
The charge size is in accordance with the room size within which the refrigerant containing parts are installed.
•
The ventilation machinery and outlets are operating adequately and are not obstructed.
•
If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of
refrigerant.
•
Marking to the equipment continues to be visible and legible. Markings and signs that are illegible shall be
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.
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 immediately but it is necessary to continue operation,
and 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.
Repairs to sealed components
During repairs to sealed components, all electrical connections 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 valves, etc.
Ensure that the apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded to the point that they no longer serve the purpose of
preventing the ingress of flammable atmospheres.
Replacem
ent parts shall be in accordance with the manufacturer’s specifications.
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