2-4 Presence of ﬁ re extinguisher
• If any hot work is to be conducted on the refrigeration equipment or any associated
parts, appropriate ﬁ re extinguishing equipment shall be available at hand.
• Have a dry powder or CO
ﬁ re extinguisher adjacent to the charging area.
2-5 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 ﬂ ammable refrigerant shall
use any sources of ignition in such a manner that it may lead to the risk of ﬁ re or
• All possible ignition sources, including cigarette smoking, should be kept sufﬁ ciently
far away from the site of installation, repairing, removing and disposal, during which
ﬂ 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 ﬂ ammable hazards or ignition risks. “No Smoking” signs shall
2-6 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.
2-7 Checks to the refrigeration equipment
• Where electrical components are being changed, they shall be ﬁ t for the purpose
and to the correct speciﬁ 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 ﬂ ammable 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
- 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 compo-
nents, unless the components are constructed of materials which are inherently
resistant to being corroded or are suitably protected against being so corroded.
2-8 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 con-
nected 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 pos-
sibility 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.
3-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 servic-
ing, 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 electri-
cal components, the casing is not altered in such a way that the level of protection is
• This shall include damage to cables, excessive number of connections, terminals not
made to original speciﬁ cation, damage to seals, incorrect ﬁ tting of glands, etc.
• Ensure that apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded such that they no longer
serve the purpose of preventing the ingress of ﬂ ammable atmospheres.
• Replacement parts shall be in accordance with the manufacturer’s speciﬁ cations.
NOTES: The use of silicon sealant may inhibit the effectiveness of some types of leak
Intrinsically safe components do not have to be isolated prior to working on