Refrigeration Piping Work; Refrigeration Piping Work Procedures And Caution In Connecting - Gree GUHN24NK3HO Service Manual

3 REFRIGERATION PIPING WORK

3.1 Refrigeration Piping Work Procedures and Caution in
Connecting
3.1.1 Flare Processing
(1) Cut the connection pipe with the pipe cutter and remove the burrs.
(2) Hold the pipe downward to prevent cuttings from entering the pipe.
(3) Remove the flare nuts at the stop valve of the outdoor unit and inside the accessory bag of the
indoor unit, then insert them to the connection pipe, after that, flare the connection pipe with a
flaring tool.
(4) Check if the flare part is spread evenly and there are no cracks (see Figure 3-2-3).
3.1.2 Bending Pipes
(1) The pipes are shaped by your hands. Be careful not to collapse them.
(2) Do not bend the pipes in an angle more than 90° .
(3) When pipes are repeatedly bent or stretched, the material will
harden, making it difficult to bend or stretch them any more.
Do not bend or stretch the pipes more than three times.
(4) When bending the pipe, do not bend it as is. The pipe will be
collapsed. In this case, cut the heat insulating pipe with a sharp
cutter as shown in Figure 3-2-5, and bend it after exposing the
pipe. After bending the pipe as you want, be sure to put the heat insulating pipe back on the pipe,
and secure it with tape.
①. To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of 150 mm or over.
②. If the pipe is bent repeatedly at the same place, it will break.
Figure 3-2-3
Figure 3-2-4
CAUTION!
58
U-Match Series Service Manual
Figure 3-2-5