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Installation and Maintenance
Service Manual
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, the following precautions shall be complied with prior to conducting
work on the system.
●
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.
●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
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.
●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 CO
2
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 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 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.
●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.
●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 actual 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;
---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:
1.That capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking;