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Page 32
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1. Checks to the area
3. General work area
4. Checking for presence of refrigerant
5. Presence of re extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate
re extinguishing equipment shall be available to hand. Have a dry power or CO2 re 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 ammable refrigerant shall use any sources of ignition in such a
manner that it may lead to the risk of re or explosion. All possible ignition sources, including cigarette
smoking, should be kept sufciently far away from the site of installation, repairing, removing and
disposal, during which ammable 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 ammable hazards or ignition risks. NO SMOKING signs shall be displayed.
2. Work procedure
All mintenance staff and others working in the local area shall be instructed on the nature of work
being carried out. work in conned sapces 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
ammable material.
Prior to beginning work on systems containing ammable refrigerants, safety checks are necessary
to ensure that the risk of ignition is minimised. For repair to the refrigerating system, the following
precautions shall be complied with prior to conducting work on the system.
Works shall be undertaken under a controlled procedure so as to minimise the risk of a
ammable gas or vapour being present while the work is being performed.
The area shall be checked with an appropriate refrigerant detector prior to and during work,
to ensure the technician is aware of potentially ammable atmospheres. Ensure that the leak
detection equipment being used is suitable for use with ammable refrigerants, i.e. no sparking,
adequately sealed or intrinsically safe.
,,
,,
Information Servicing
(Required for the units adopt R32/R290 Refrigerant only)
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9. Checks to electrical devices
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 circuits shall be checked
for the presence of refrigerant; marking to the equipment continues to be visible and
legible.
marking 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.
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, and 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 there no live electrical components and wiring are exposed while charging, recovering
or purging the system;
that there is continuity of earth bonding.
7. Ventilated area
Ensure that the area is in the open or that it it 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.
8. Checks to the refrigeration equipment
Where electrical components are being changed, they shall be t for the purpose and to the correct
specication. 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 ammable refrigerants:
,
,
33


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