7
•
Electronic leak detectors can be used to detect refrigerant leaks; however, in
the case of flammable refrigerants, the sensitivity level may not be suitable or
recalibration may be necessary. (The detection equipment must be calibrated in
an area devoid of refrigerant). Check that the detector is not a potential ignition
source and is appropriate for the refrigerant used. The leak detection equipment
must be adjusted to a percentage of the refrigerant's LFL and must be calibrated
according to the refrigerant used. The appropriate gas percentage (25% at most)
must be confirmed.
•
Leak detection fluids are also suited for use with most refrigerants, however the
use of detergents containing chlorine must be avoided since it could react with the
refrigerant and cause corrosion to the copper piping.
•
If a leak is suspected, all naked flames must be removed/extinguished.
•
If a refrigerant leak is detected and requires soldering, the entire quantity of
refrigerant must be removed from the system or isolated (by way of shut-off valves)
in part of the system located away from the leak.
Removal and discharge
•
When accessing the cooling circuit to carry out repairs, or for any other reason,
conventional procedures must be employed. However, for flammable refrigerants,
the recommendations must be complied with in order to take account of the
product's flammability. The following procedure must be followed:
-
remove the refrigerant;
-
purge the circuit with an inert gas (optional for A2L);
-
drain (optional for A2L);
-
purge with an inert gas (optional for A2L);
-
open the circuit by cutting or soldering.
•
The refrigerant charge must be recovered in suitable recovery cylinders. For
appliances containing flammable refrigerants other than A2L refrigerants, the
system must be bled with nitrogen devoid of oxygen to make the appliance suitable
for receiving flammable refrigerants. You may need to repeat this process several
times. Compressed air or oxygen must not be used to purge cooling systems.
Loading procedures
•
Check that the vacuum pump outlet is not located in the vicinity of any potential
ignition source and that ventilation is provided.
•
In addition to conventional charging procedures, the following requirements apply.
-
Check that there is no possibility of cross-contamination between the different
refrigerants when using charging equipment. Hoses or lines must be as short as
possible to reduce the quantity of refrigerant contained therein.
-
Cylinders must be kept in an appropriate position, in accordance with the
instructions.
-
Check that the cooling system is grounded before charging the system with
refrigerant.
-
Label the system once charging is complete (if this is not already the case).
-
Pay close attention to not overfilling the cooling system.
•
Before recharging the system, carry out a pressure test using a suitable purge gas.
EN
Summary of Contents for PM40 Series
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