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Idiomas disponibles
Idiomas disponibles
Important Safety Information
READ AND FOLLOW ALL SAFETY INSTRUCTIONS
Leak detection methods
The following leak detection methods are deemed acceptable for systems containing flammable
refrigerants:
• Electronic leak detectors shall be used to detect flammable refrigerants but the sensitivity may not be
adequate or may need recalibration. Detection equipment shall be calibrated in a refrigerant-free area.
Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.
• Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be
calibrated to the refrigerant employed and the appropriate percentage of gas (25% maximum) is
confirmed.
• Leak detection fluids are suitable for use with most refrigerants but the use of detergents containing
chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper or
pipe-work.
• If a leak is suspected, all naked flames shall be removed or extinguished.
• If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered
from the system or isolated by means of shut off valves in a part of the system remote from the leak.
Oxygen free nitrogen (OFN) shall then be purged through the system both before and during the
brazing process.
Removal and evacuation
When breaking into the refrigerant circuit to make repairs or for any other purpose conventional
procedures shall be used. However, it is important that the best practice is followed since flammability is a
consideration. The following procedures shall be adhered to:
• Safely remove refrigerant following local and national regulations;
• Evacuate;
• Purge the circuit with inert gas (optional for A2L);
• Evacuate (optional for A2L);
• Continuously flush or purge with inert gas when using flame to open circuit; and
• Open the circuit
The refrigerant charge shall be recovered into the correct recovery cylinders if venting is not allowed by
local and national codes. For appliances containing flammable refrigerants, the system shall be purged
with oxygen-free non-flammable refrigerants. This process might need to be repeated several times.
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 (optional for A2L). This
process shall be repeated until no refrigerant is within the system (optional for A2L). When the final
oxygen-free nitrogen charge is used, the system shall be vented down to atmospheric pressure to enable
work to take place.
The outlet for the vacuum pump shall not be close to any potential ignition sources, and ventilation shall be
available.
SAVE THESE INSTRUCTIONS!
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