Publicité
Les langues disponibles
Les langues disponibles
o
open the circuit by cutting or brazing
• The refrigerant charge shall be recovered into the correct recovery cylinders
if venting is not allowed by local and national codes. For appliances
containing flammable refrigerants, the system shall be purged with oxygen-
free nitrogen to render the appliance safe for flammable refrigerants. This
process might need to be repeated several times. Compressed air or oxygen
shall not be used for purging refrigerant systems.
• For appliances containing flammable refrigerants, refrigerants purging shall
be achieved by breaking the vacuum in the system with oxygen-free nitrogen
and continuing to fill until the working pressure is achieved, then venting to
atmosphere, and finally pulling down to a vacuum (optional for A2L). This
process shall be repeated until no refrigerant is within the system (optional
for A2L). When the final oxygen-free nitrogen charge is used, the system
shall be vented down to atmospheric pressure to enable work to take place.
• Ensure that the outlet for the vacuum pump is not close to any ignition
sources and there is ventilation available.
CHARGING PROCEDURES
In addition to conventional charging procedures, the following requirements
shall be followed.
• Ensure that contamination of different refrigerants does not occur when
using charging equipment. Hoses or lines shall be as short as possible to
minimise the amount of refrigerant contained in them.
• Cylinders shall be kept upright.
• Ensure that the refrigeration system is earthed prior to charging the system
with refrigerant.
• Label the system when charging is complete (if not already).
• Extreme care shall be taken not to overfill the refrigeration system.
• Prior to recharging the system it shall be pressure tested with OFN. The
system shall be leak tested on completion of charging but prior to
commissioning. A follow up leak test shall be carried out prior to leaving the
site.
DECOMMISSIONING
Before carrying out this procedure, it is essential that the technician is
completely familiar with the equipment and all its detail. It is recommended
good practice that all refrigerants are recovered safely. Prior to the task being
carried out, an oil and refrigerant sample shall be taken in case analysis is
required prior to re-use of reclaimed refrigerant. It is essential that electrical
power is available before the task is commenced.
a) Become familiar with the equipment and its operation.
www.newair.com
EN
22
Publicité
