CLIVET CRISTALLO MM2-Y 27M Handbuch Für Installation Seite 54

4.3 Operate safely with R32 refrigerant present
FLAMMABLE MATERIAL
The refrigerant used inside this unit is
flammable. A coolant leak that is exposed to
an external ignition source can create fire risks
1. Controls in the area
Before starting work on a system containing flammable
refrigerants, carry out the appropriate safety checks to
ensure that the risk of ignition is minimal. When repairing
the refrigeration system, it is recommended that the
following precautions be taken before starting the work.
2. Work procedures
The work must be carried out according to a controlled
procedure in order to minimise the risk of flammable
gases or vapours being present during the work.
3. General work area
Maintenance personnel and other people working in the
area should be informed about the nature of the work to
be done. It is recommended not to carry out operations in
enclosed spaces. The area around the workspace must
be made inaccessible. Verify that conditions within the
area are safe in terms of control of flammable materials.
4. Checking the presence of refrigerant
The area must be checked using an appropriate refrigerant
detector before and during the intervention so that the
technician is aware of potentially flammable atmospheres.
Check that the leak detection unit is suitable for use with
flammable refrigerants (does not generate sparks and is
adequately sealed or intrinsically safe).
5. Presence of fire extinguishers
If hot operations are to be carried out on refrigeration
equipment or associated components, a suitable fire
extinguisher must be kept on hand. Keep a dry-powder
or CO extinguisher near the loading area.
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6. Absence of ignition sources
When the operations to be carried out on a refrigeration
system involve exposing piping containing or having
contained a flammable refrigerant, it is forbidden to use
any source of ignition that could generate a risk of fire
or explosion. All possible sources of ignition, including
cigarette smoke, should be kept at a sufficient distance
from the installation, repair, disassembly and disposal site,
as flammable coolant may escape into the surrounding
space during these operations. Before starting the work,
the area around the appliance must be inspected to
ensure that it does not present ignition or flammability
hazards. "NO SMOKING" signs must be affixed.
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7. Area ventilation
Before working on the system or performing hot
operations, make sure the area is open or adequately
ventilated. Ventilation must be constant for the entire
duration of the operation. Ventilation must be capable of
safely dispersing all refrigerant released and preferably
expelling it outside into the atmosphere.
8. Controls on refrigeration equipment
When changing an electrical component, the new one
must be suitable for the intended use and meet the correct
specifications. The manufacturer's maintenance and
service instructions must be followed in all circumstances.
When in doubt, consult the manufacturer's technical
department. The following checks are recommended for
installations using flammable refrigerants:
– the charge volume must be suitable for the cubic
capacity of the room in which the components
containing the refrigerant are installed;
– ventilation devices and openings must open
properly and not be obstructed;
– if an indirect refrigerant circuit is used, the
presence of refrigerant in the secondary circuits
must be checked; the equipment markings must
remain visible and legible;
– markings and indications that become illegible
shall be corrected;
– pipes or other components of the refrigerant circuit
shall be installed in locations where exposure to
potentially corrosive substances is unlikely for
components containing the refrigerant, unless
they are made of materials inherently resistant to
corrosion or adequately protected against the risk
of corrosion;
9. Controls on electrical devices
The repair and maintenance procedures for electric
components must include initial safety checks and
component inspection procedures. If a defect is found
that may generate safety risks, the power supply to
the circuit must be interrupted until the problem is
satisfactorily resolved. If the problem cannot be solved
immediately, but it is necessary to keep the system
running, an appropriate temporary solution must be
adopted. The situation should be communicated to the
owner of the equipment so that all persons concerned
can be duly informed.
Initial security checks:
– check that the capacitors are discharged: this
procedure must be performed safely to avoid the
possibility of sparks;
– check that there are no live components or wires
exposed while charging, restoring or venting of
the system;
– check for interruptions in the earthing.
Maintenance