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Specialist's Manual

Aptitude requirement for maintenance man (repairs. should be done only be specialists).

a) Any person who is involved with working on or breaking into a refrigerant circuit should hold a current valid

certificate from an industry-accredited assessment authority, which authorises their competence to handle

refrigerants safely in accordance with an industry recognised assessment specifìcation.

b) Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance and repair

requiring the assistance of other skilled personnel shall be carried out under the supevision of the person

competent in the use of flammable refrigerants.

Safety preparation work

The maximum refrigerant charge amount is shown on the following table a

(Note: Please refer to the nameplate for the charging quantity of R290)

Room area (m 2 )

Maximum charge (kg)

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

AII 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

lf 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 shall

use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. AII 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 the correct specification.

At all times the manufacturer's maintenance and service guidelines shall be followed. lf 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;

V 12/21

<0.152

0.225

table a - Maximum charge (kg)

0.304