Decommissioning - Black & Decker BXEH60003GB Manual

♦
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. This process shall be repeated
until no refrigerant is within the system.
When the final oxygen-free nitrogen 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 potential ignition sources and
that ventilation is 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 in an appropriate
position according to the instructions.
♦
Ensure that the refrigerating 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
refrigerating system.
♦
Prior to recharging the system, it shall
be pressure-tested with the appropriate
purging gas. 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.
(Original instructions)

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 recovered
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 instructions.
h. Do not overfill cylinders (no more than 80%
volume liquid charge).
i. Do not exceed the maximum working
pressure of the cylinder, even temporarily.
j. When the cylinders have been filled
correctly and the process completed, make
sure that the cylinders and the equipment
are removed from site promptly and all
isolation valves on the equipment are
closed off.
k. Recovered refrigerant shall not be charged
into another refrigerating system unless it
has been cleaned and checked.
ENGLISH
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