DC INVERTER MULTI VRF INSTALLATION
154
2）Cleaning steps：
a. Mount a pressure gauge on nitrogen cylinder;
b. High pressure end of the pressure gauge is connected to the refrigerant filling nozzle of the
small pipe (liquid pipe)
c. All copper pipe ports outside the A side of indoor unit shall be blocked by blanking plugs.
d. The valve on nitrogen cylinder shall be opened to maintain pressure at 28Kgf/ cm
2
e. Check whether nitrogen flows through the liquid pipe of indoor unit A
f. Cleaning
The mouth of the pipe shall be blocked with insulation material held by hand until pressure rises to
a level difficult to be withstood, and at the moment the insulation material shall be released quickly.
And then the mouth shall be blocked again. Repeat such procedures several times. Afterwards,
use a wood board posted with white paper to check it. If there is not evident dirt on the white paper,
the pipe will be considered clean.
g. Shut off the main valve of nitrogen
h. Repeat the above procedures on indoor unit B
i. After cleaning of liquid pipe, gas pipe shall be cleaned in the same way.
Blanking plug
Copper pipe
Copper pipe ports not to be
cleaned shall be blocked by
blanking plugs
Cleanin
ir pipe
The opening of the pipe not to be purged
shall be blocked with blind plug.
Block with insulation materials
Quick release
To Next Page
Loading...
