Midea MAP05S1AWT-A User Manual page 11

7. Sealed electrical components shall be replaced.
8. Intrinsically safe components must be replaced.
9. Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration,
or fans.
10. Detection of flammable refrigerants
Under no circumstances shall potential 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.
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 re-calibration.
(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
pipe-work.
If a leak is suspected, all naked flames shall be removed/extinguished. If a leakage of
refrigerant is found which requires brazing, all of the refrigerant shall be recovered
remote from the leak. Removal of refrigerant shall be according to Removal and
evacuation.
11. Removal and evacuation
When breaking into the refrigerant circuit to make repairs—or for any other
purpose - conventional procedures shall be used. However, for flammable
refrigerants it is important that best practice be followed, since flammability is a
consideration. The following procedure 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 units containing flammable
refrigerants, the system shall be purged with oxygen-free nitrogen to render the
appliance safe for flammable refrigerants. This process may need to be repeated
several times. Do not use compressed air or oxygen to purge refrigerant systems.
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