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16.
Charging operations
In addition to conventional charging procedures, it is
recommended to follow the ensuing guidelines:
– When
using
contamination with different refrigerants. Limit the
length of the pipes or lines as much as possible to
reduce the amount of refrigerant they contain.
– Cylinders must be held vertically.
– Before charging the coolant into the system, make
sure that it is properly earthed.
– Label the system after loading (if the label is not
already present).
– Use extreme care to avoid overfilling the system.
– Before recharging the system, test the pressure
using oxygen-free nitrogen. After charging, but
before commissioning, check the system for
leaks. Perform an additional leakage check before
leaving the site.
17.
Disposal
Before performing this procedure, it is essential that the
technician is fully familiar with the equipment and all of its
components. It is recommended to recover all refrigerants
following safe procedures. Before proceeding, take an oil
and coolant sample.
Before reusing the recovered refrigerant, it should be
analysis if necessary. Before starting the procedure it is
essential to check the availability of the power supply.
1 Familiarize yourself with the device and its operation.
2 Electrically isolate the system.
3 Before proceeding, check the following:
– that mechanical equipment for handling refrigerant
cylinders is available if necessary;
– that the necessary personal protective equipment
is available and is used;
– that the recovery process is carried out under the
constant supervision of a competent person;
– that the recovery equipment and cylinders comply
with regulations in force.
4 If possible, transfer the refrigerant to the outdoor unit
using a "pump-down" procedure.
5 If it is not possible to create a vacuum, use a manifold
that allows the refrigerant to be expelled from various
parts of the system.
6 Before proceeding with the recovery, place the
cylinder on the scales.
7 Start the recovery device and use it according to the
manufacturer's instructions.
8 Do not fill the cylinders excessively. (Do not exceed
80% of the liquid volume).
9 Do not exceed the maximum working pressure of the
cylinder, even temporarily.
22
charging
equipment,
10 After filling the cylinders correctly and completing the
procedure, transfer the cylinders and equipment from
the site as soon as possible and close all isolation
valves on the equipment.
avoid
11 Before loading the recovered refrigerant into another
refrigeration system it will be necessary to clean and
check it.
18.
Labelling
The appliance must be labelled to indicate that it has been
decommissioned and emptied of refrigerant. The label
must be dated and signed. Make sure that labels indicating
flammable refrigerant content are affixed to the appliance.
19.
Recovery
– When discharging refrigerant from a system for
maintenance or decommissioning reasons, it is
recommended to extract the refrigerant safely.
– If the refrigerant is decanted into cylinders, use
only cylinders suitable for refrigerant recovery.
Verify that the number of cylinders required to hold
the entire system charge is available. All cylinders
to be used shall be designated for the refrigerant
recovered and labelled for that refrigerant (special
refrigerant recovery cylinders). Cylinders shall be
equipped with a safety valve and well-functioning
shut-off valves.
– Empty recovery cylinders must be evacuated and,
if possible, cooled before recovery.
– The recovery equipment must be in good working
order, accompanied by a set of instructions at hand,
and must be suitable for flammable refrigerant
recovery. In addition, you will need prepare a set
of well functioning calibrated scales.
– The pipes shall be complete with decoupling
fittings that are leak-free and in good condition.
Before using the recovery equipment, check that it
is in good working order, that it has been properly
maintained and that the associated electrical
components are sealed to prevent risk of ignition
in the event of refrigerant leakage. If in doubt,
consult the manufacturer.
– The recovered refrigerant must be returned to
the supplier in the correct recovery cylinders,
accompanied by the relevant waste identification
form. Do not mix different types of refrigerant in
recovery units, especially in cylinders.
– If compressors or compressor oils need to be
decommissioned, evacuate them to an acceptable
level to prevent flammable refrigerant from
remaining inside the lubricant. The evacuation
procedure must be carried out before returning
the compressor to the suppliers. To accelerate
this process, only use electric heating on the
compressor body. When extracting oil from the
system, drain it using a safe procedure.
Maintenance
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