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1.GENERAL INFORMATION
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.
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
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.
Presence of fire extinguisher:
If any hot 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.
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.
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.
Checks to the refrigeration equipment:
Where electrical components are being changed,
they shall be fit for the purpose and to the correct
specification. At all times the manufacturer's
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 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.
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 whiule charging, recovering or purging
the system;
that there is continuity of earth bonding.
Repairs to sealed components:
During repairs to sealed components, all electrical
supplies shall be disconnected from the equipment
being worked upon prior to any removal of sealed
covers, etc. If it is absolutely necessary to have an
electrical supply to equipment during servicing,
then a permanently operating form of leak detection
shall be located at the most critical point to warn
of a potentially hazardous situation.
Particular attention shall be paid to the following
to ensure that by working on electrical components,
the casing is not altered in such a way that the level
of protection is affected. This shall include damage
to cables, excessive number of connections,
terminals not made to original specification,
damage to seals, incorrect fitting of glands, etc.
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not
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