6
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.
1. Become familiar with the equipment and its operation.
2. Isolate system electrically.
3.
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.
4.
Pump down refrigerant system, if possible.
5.
If a vacuum is not possible, make a manifold so that refrigerant can be removed
from various parts of the system
6.
Make sure that cylinder is situated on the scales before recovery takes place.
7.
Start the recovery machine and operate in accordance with instructions.
8. Do not overfill cylinders (no more than 80 % volume liquid charge).
9. Do not exceed the maximum working pressure of the cylinder, even temporarily.
10. 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
alt isolation valves on the equipment are closed off.
11. Recovered refrigerant shall not be charged into another refrigerating system
unless it has been cleaned and checked.
TROUBLESHOOTING
•
All soldering work must be carried out by a someone qualified to do so.
• Replacement pipes must always be made of copper in compliance with standard
NF EN 12735-1.
•
Leak detection, pressure test:
-
never use oxygen or dry air (risk of fire or explosion)
-use dry nitrogen or the mixture of nitrogen and coolant indicated on the
information plate,
-the test pressure for both the high and low pressure circuits must not exceed 42
bar (for R410A), 20 bar and 15 bar (for R407C) if the appliance is equipped with
the optional pressure gauge.
• The high pressure circuit pipes are made of copper and have a diameter equal to or
greater than 1’’5/8. A certificate as indicated in §2.1 in compliance with standard NF
EN 10204 will be requested from the supplier and filed with the facility’s technical
documentation.
•
Technical data relative to the safety requirements of the various applicable directives
are indicated on the information plate. All this information must be recorded in
the appliance’s installation manual, which must be kept in the its technical file:
model, code, serial number, maximum and minimum OT, OP, year of manufacture,
CE marking, manufacturer’s address, coolant and weight, electrical parameters,
thermo-dynamic and acoustic performance.
LABELLING
•
Equipment shall be labelled stating that it has been decommissioned 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.
RECOVERING
•
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 is available. All cylinders to be used