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When Connecting Refrigerant Tubing
Pay particular attention to refrigerant leakages.
WARNING
•
When performing piping work, do not mix air except for specified refrigerant in
refrigeration cycle. It causes capacity down, and risk of explosion and injury due to
high tension inside the refrigerant cycle.
•
If the refrigerant comes in contact with a flame, it produces a toxic gas and a fire.
•
Do not add or replace refrigerant other than specified type. It may cause product
damage, burst and injury, etc.
•
Ventilate the room immediately in the event of a refrigerant gas leakage during
installation. Be careful not to allow contact of the refrigerant gas with a flame as this will
cause the generation of toxic gas and fire.
•
Keep all tubing runs as short as possible.
•
Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before
connecting them, then tighten the nut with a torque wrench for a leak-free connection.
•
Check carefully for leaks before starting the test run.
•
Do not leak refrigerant while piping work for an installation or re-installation, and while
repairing refrigeration parts.
Handle liquid refrigerant carefully as it may cause frostbite.
•
Under no circumstances shall potential sources of ignition be used in the searching or
detection of refrigerant leaks.
•
A halide torch (or any other detector using a naked flame) shall not be used.
•
Electronic leak detectors may be used to detect refrigerant leaks 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 lower flammable limit
(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 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.
•
If refrigerant R32 is used and the optional “R32 refrigerant leakage detection sensor”
is connected to the indoor unit, do not turn off the ELCB of the indoor unit except
when there is a symptom of abnormality or failure, or when performing short-term
maintenance. (When the ELCB is turned off, R32 refrigerant leakage detection sensor
cannot detect the refrigerant leakage when the refrigerant leaks, and it may lead to
cause the generation of toxic gas and fire.)
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