DC Inverter U-match Series Floor Ceiling Type Unit
32
Pressure gauge (Low-pressure)
Switch (Low-pressure)
Connection pipe (to indoor unit)
Liquid valve
Gas valve
Service port
gauge manifold
Pressure gauge (Hi-pressure)
Switch (Hi-pressure)
Connection pipe
Cap
Service pipe
Cap
Hose with the valve pin
Hose
Cap
Vacuum pump
Notice:
For large-size units, there are maintenance ports for liquid valve
and gas valve. During evacuation, you may connect the two hoses of
the branch valve assembly to the maintenance ports to speed up the
evacuation.
3.2.4.2 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
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
