Information On Maintenance And Servicing - Argo APHPDHW200 Use And Installation Manual

5.3 Information on Maintenance and servicing

1) 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 minimized. For repair
to the refrigerating system, the following precautions
shall be complied with prior to conducting work on
the system
2) 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
3) General work area
All maintenance staff and others working in the
area shall be instructed on the nature of work being
carried out. Work in confined spaces shall be
avoided. The area around the work space shall be
sectioned off. Ensure that the conditions within the
area have been made safe by control of flammable
material.
4) 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
flammable atmospheres. Ensure that the leak detection
equipment being used is suitable for use with
flammable refrigerants, i.e. non-sparking, adequately
sealed or intrinsically safe.
5) Presence of fire extinguisher
If any 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 powder or CO2 fire extinguisher adjacent
to the charging area
6) No ignition sources
No person carrying out work in relation to a
refrigeration system which involves exposing any pipe
work that contains or has contained flammable
refrigerant shall use any sources of ignition in such a
manner that it may 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 flammable 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
aware of potentially
7) Ventilated area
Ensure that the area is in the open or that it is adequately
ventilated before breaking into the system or conducting
any work. Ventilation shall
period that the work is carried out. The ventilation
should safely dilute any released refrigerant and
preferably expel it externally into the atmosphere.
8) Checks to the refrigeration equipment
Where electrical components are being changed, they
shall be fit for the purpose and
specification. At all times the manufacturer's maintenance
and service guidelines shall be followed. If in doubt
consult the manufacturer's technical department
assistance.
The following checks
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.
9) Checks to electrical devices
Repair and maintenance to electrical components shall
include initial safety
inspection procedures. If a fault exists that
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
warned.
Initial safety checks shall include:
− That capacitors are discharged, this shall be done in
a safe manner to avoid possibility of sparking;
− That there no live electrical components and wiring
are exposed while charging, recovering or purging
the system;
− That there is continuity of earth bonding.
continue during the
to the correct
for
shall be applied to
checks and component
could
EN
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