DC Inverter U-match Series Floor Ceiling Type Unit
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(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 Fig. 4.10, 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.
Fig. 4.10
①
. To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of
150mm (5-7/8inch) or over.
②
. If the pipe is bent repeatedly at the same place, it will break.
4.3.3 Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
①
. Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is
improper, the flare nut cannot be tightened smoothly. If the flare nut is forced to turn, the threads
will be damaged.
②
. Do not remove the flare nut until the connection pipe is to be connected so as to prevent dust
and impurities from coming into the pipe system.
When connecting the pipe to the unit or removing it from the unit, please do use
both the spanner and the torque wrench (Fig. 4.11).
When connecting, smear both inside and outside of the flare nut with
refrigeration oil, screw it hand tight and then tighten it with the spanner.
Refer to Table 4.3 to check if the wrench has been tightened properly (too tight
would mangle the nut and lead to leakage).
Examine the connection pipe to see if it leaks, then take the treatment of heat
insulation, as shown in the Fig. 4.12.
Use the medium-sized sponge to insulate the coupler of the gas pipe.
