Johnson AURUM R290 M Serie Guide D'utilisation page 59

Examples for such working procedures are:
– breaking into the refrigerating circuit;
– opening of sealed components;
– opening of ventilated enclosures.
②
General
WARNING
Protection devices, piping and fittings shall
be protected as far as possible against adverse
environmental effects, for example the danger
of water collecting and freezing in relief pipes or
the accumulation of dirt and debris;
Provision shall be made for expansion and
contraction of long runs of piping;
Piping in refrigerating systems shall be so
designed and installed as to minimize the
likelihood of hydraulic shock damaging the
system;
Steel pipes and components shall be
protected against corrosion with a rustproof
coating before applying any insulation;
Information on servicing
①
General
CAUTION
Servicing shall be performed only as
recommended by the manufacturer.
②
Checks to the area
Prior to beginning work on systems containing
flammable refrigerants, safety checks are necessary
to ensure that the risk of ignition is minimised. For
repair to the refrigerating system, DD.4.3 to DD.4.7
shall be completed prior to conducting work on the
system.
③
Work procedure
Work shall be undertaken under a controlled
procedure so as to minimise the risk of a flammable
gas or vapour being present while the work is being
performed.
④
General work area
All maintenance staff and others working in the local
area shall be instructed on the nature of work being
carried out. Work in confined spaces shall be
avoided.
The area around the workspace shall be sectioned
off. Ensure that the conditions within the area have
been made safe by control of flammable material.
⑤
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, i.e. non-sparking,
adequately sealed or intrinsically safe.
⑥
Presence of fire extinguisher
If any hot work is to be conducted on the refrigerating
equipment or any associated parts, appropriate fire
extinguishing equipment shall be available to hand.
Have a dry powder or CO
to the charging area.
⑦
No ignition sources
No person carrying out work in relation to a
refrigerating system which involves exposing any
pipe work shall use any sources of ignition in such a
manner that it can 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, 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 hazards or ignition
risks. "No Smoking" signs shall be displayed.
⑧
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.
⑨
Checks to the refrigerating equipment
Where electrical components are being changed,
they shall be fit for the purpose and to the correct
specification. At all
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 refrigerant charge 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;
– refrigerating pipe or components are installed in a
position where they are unlikely to be exposed to any
substance which can 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.
⑩
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, 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.
02
fire extinguisher adjacent
2
times the manufacturer's
V.1