Carrier CD-7QF2 20 Owner'S Manual Download Page 9

Page: 9 / 106

SAFETY PRECAUTIONS

system.
2) 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.
3) 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.
4) 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.
5) 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 C02 fire 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

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. No Smoking signs shall be

displayed.
7) 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.
8) 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