29
The pipes must be supplied clean and sealed at the
ends. Pre-insulated copper refrigeration pipes can be
used.
The pipes must not contain residues of shavings, dirt or
water which could damage the components of the unit
and impair its correct operation.
Using pipes with diameters other than that indicated in
the technical data table is forbidden.
Employing used refrigeration lines is prohibited be-
-
anteed.
Making connections using the normal plumbing system
is forbidden.
Welding in the presence of refrigerant in the refrigerant
circuit is forbidden. If necessary, the refrigerant must
be recovered and the circuit cleaned with oxygen-free
nitrogen.
SpecicwarningsforR32
The length of the connecting pipes must be kept to a
minimum.
Connecting pipes must be protected from physical
damage and must not be installed in an unventilated
space if this space is smaller than that shown in the
Minimum Floor Area table.
The connecting pipes must be installed in a position
where they are unlikely to be exposed to corrosive sub-
stances unless they are constructed of materials that
are inherently corrosion-resistant or adequately pro-
tected against corrosion.
Compliance with national legislation for the gas in use
is mandatory.
-
nance purposes.
A controlled procedure must be followed to minimise
while working.
Work with heat (welding, soldering, etc.) is prohibited.
The following precautions must be taken when estab-
Area inspections
• carry out safety checks to ensure that the risk of com-
bustion is minimised
•
• delimit the area around the workspace
• ensure safe working conditions around the area by
Checks for the presence of refrigerant
• The area must be checked with an appropriate re-
frigerant detector before and during work to ensure
atmospheres
• make sure that the leak detection equipment is suit-
does not produce sparks, is adequately sealed or in-
trinsically safe
is forbidden.
Combustion source inspections
• the people operating on a refrigeration system in-
volving the exposure of pipes that either contain or
or explosion
• all potentials sources of combustion, including lit cig-
refrigerant could be released into the surrounding
space
• check the area around the equipment to ensure there
• put up “No smoking” signs
Area ventilation inspections
• ensure that the area is adequately ventilated
• there must be a continuous degree of ventilation
while working
• ventilation must safely disperse any released refrig-
erant and preferably expel it outside into the atmos-
phere
Leak detection
is forbidden.
Follow the instructions below for leak detection:
• -
erants
• check that the detectors are properly calibrated be-
fore use
• calibration operations must be carried out in an area
free from refrigerant
• make sure that the detector is not a potential source
of combustion and that it is suitable for the refriger-
ant used
• -
ed
• in the event of a leak requiring brazing, it is manda-
tory to recover all the refrigerant from the system or
system away from the leak
of some types of leak detectors.
Charging procedure
For the charging procedure make sure that:
• -
ants
• the pipes of the charging equipment are as short as
possible to minimise the amount of refrigerant
• the cylinders are kept in a vertical position
• the refrigeration system is earthed before charging
Make sure that the leak test has been carried out be-
fore charging.
Check if there are no leaks of refrigerant before leaving
the site.
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