Original User Manual – AREBOS Mini Heat Pump
19
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 that ventilation is available.
16 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 minimize 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 over fill the refrigeration 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.
17 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 person al 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.
a. Pump down refrigerant system, if possible.
b. If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts
of the system.
c. Make sure that cylinder is situated on the scales before recovery takes place.
d. Start the recovery machine and operate in accordance with manufacturer's instructions.
e. Do not overfill cylinders. (No more than 80 % volume liquid charge).
f. Do not exceed the maximum working pressure of the cylinder, even temporarily.
g. 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.
h. Recovered refrigerant shall not be charged into another refrigeration system unless it has been
cleaned and checked.
18 Labelling
Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant.
The label shall be dated and signed. For appliances containing flammable refrigerants, ensure that
there are labels on the equipment stating the equipment contains flammable refrigerant.
19 Recovery
When removing refrigerant from a system, either for servicing or decommissioning, it is
recommended good practice that all refrigerants are removed safely.
When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery
cylinders are employed. Ensure that the correct number of cylinders for holding the total system
charge are available. All cylinders to be used are designated for the recovered refrigerant and
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