GRE HPG25 Bedienungsanleitung Seite 6

Area check
 Before starting work on systems containing flammable refrigerants, safety checks must be carried out to guarantee a
minimal ignition risk.
Work procedure
 The work must be carried out according to a controlled procedure in order to reduce the risks of releasing a flammable
gas or vapour while working.
 Before beginning work on the cooling circuit, stop the appliance and wait for a few minutes before fitting the
temperature and pressure sensors. Some elements such as the compressor and piping may reach temperatures in excess of
100°C and high pressures with the consequent risk of severe burns.
General work area
 All maintenance staff and other personnel working in the surrounding area must be made aware of the work carried out.
Work conducted in enclosed areas must be avoided.
Check for the presence of refrigerant
 The area must be analysed using a suitable refrigerant detector before and during work so that the technician is
informed of the presence of a potentially toxic or flammable atmosphere. Check that the leak detection equipment used is
suitable for use with all refrigerants concerned, i.e. that it does not cause a spark, is correctly isolated or is entirely safe.
Check for the presence of a fire extinguisher
 If work must be carried out on the cooling equipment or any part associated therewith at a certain temperature, suitable
fire extinguishing means must be within reach. Place a dry chemical fire extinguisher or CO fire extinguisher near the work
2
area.
No source of ignition
 No person carrying out work on a cooling system involving exposing the piping may use any ignition source, which could
create a fire or explosion risk. All possible ignition sources, in particular cigarettes, must not enter within a sufficient
perimeter of the installation, repair, removal or disposal site, in the event that refrigerant could be released into the
surrounding space. Before starting the work, the area around the equipment must be examined to check for all fire or
ignition risks. "No smoking" signs must be displayed.
Area ventilation
 Before accessing the unit in any manner whatsoever with the intention of performing any maintenance task, check that
the area is open and well-ventilated. Suitable ventilation must be provided throughout the maintenance task to allow any
refrigerant that could be released into the atmosphere to be safely dispersed.
Refrigeration equipment check
 The manufacturer's recommendations in terms of care and maintenance must always be complied with. When
replacing electric components, check that components used are of the same type and category as those
recommended/approved by the manufacturer. When in doubt, contact the manufacturer's technical department for
assistance.
 The following checks must be applied to installations using flammable refrigerants:
- the markings on the equipment must remain visible and legible; any illegible markings or signs must be rectified;
- the hoses or components of the cooling circuit are installed in a position where they are unlikely to be exposed to any
substance capable of corroding the components containing refrigerant, unless the components are made from materials
that are typically corrosion-proof or correctly protected from such corrosion.
Electric component check
 The repair and maintenance of electric components must include initial safety checks and component inspection
procedures. If a defect capable of jeopardising safety arises, no power supply must be connected to the circuit until the
problem has been completely resolved. If the defect cannot be rectified immediately and if maintenance work must
continue, an appropriate temporary solution must be found. This must be reported to the equipment's owner so that all
persons concerned are made aware.
 The repair and maintenance of electric components must include the following initial safety checks:
- the capacitors are discharged: this must be carried out safely to prevent all risks of ignition;
- no electric component or live wiring is exposed while charging, overhauling or draining the system;
3