6
Impedance Declaration
This appliance can be connected only to a power supply with system impedance no more
than 0.381
Ω
. If necessary, please consult your local utility authority for system impedance
information.
REPAIR SAFETY NOTES (Professional use only)
Cabling:
Regularly check that cabling is not showing signs of wear, corrosion, excessive pressure,
vibration, sharp edges, any other adverse environmental effects. The check shall also
consider the effects of aging or continual vibration from sources such as compressors or
fans.
Detection of Flammable Refrigerants:
Under no circumstances shall potentially sources of ignition be used in the searching for or
detection of refrigerant leaks. A halide torch (or any other detector using a naked flame)
shall not be used.
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, 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 pipework.
If a leak is suspected, all naked flames shall be removed/extinguished. If a leakage of
refrigerant is found which requires brazing, all the refrigerant shall be recovered from the
system, 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.
