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·Remove the refrigerant. If the recovery is not required by national regulations, drain
ventilation available.
8 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 out prior to leaving the site.
9 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.
b) Isolate system electrically.
c) Before attempting the procedure ensure that :mechanical handling equipment
is available, if required, for handling refrigerant cylinders;all personal protective
equipment is available and being used correctly;the recovery process is supervised at
all times by a competent person; recovery equipment and cylinders conform to the
appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed
from various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with manufacturer's
instructions.
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