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Safety precautions /
Lt
CAUTION
- Evacuate;
- Purge again with inert gas;
- Open the circuit
by
cutting or brazing.
• The refrigerant charge shall be recovered into the correct recovery cylinders.
• The system shall be "flushed" with OFN to render the unit safe.
• This process may need
to
be repeated several times.
• Compressed
air
or
oxygen shall not be used
for
this task.
• Flushing shall be achieved by breaking the vacuum in the system with OFN and
continuing to fill until the working pressure is achieved, then venting
to
atmosphere, and finally pulling down
to
a vacuum.
• This process shall be repeated until no refrigerant is within the system. When
the final OFN charge is used, the system shall be vented down
to
atmospheric
pressure
to
enable work
to
take
place.
• This operation is absolutely vital
if
brazing operations on the pipe-work are to
take place.
• Ensure
that
the outlet
for
the vacuum pump is not close to
any
ignition sources
and there is ventilation available.
13.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.
14.
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.
-9-
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