DC Inverter U-match Series Floor Ceiling Type Unit
13
(3).
When pipes are repeatedly bent or stretched, the material will weaken
making it more likely to break. Do not bend or stretch the pipes more than three
times.
(4).
For best results, cut insulation before
bending, as shown in fig. 4.10. Bend pipe as
needed and secure insulation with tape.
Fig. 4.10
ķ
. To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of
150mm (6inch) or more.
ĸ
. 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.
ķ
.
Be sure to attach the pipe on the indoor unit correctly. Center the flare nut on the fitting before
tightening. Do not force the nut to turn or the threads will be damaged and the system will leak.
ĸ
. 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, use both a torque wrench and a standard
wrench or pliers (Fig. 4.11).
When connecting, smear both inside and outside of the flare nut with
refrigeration oil, tighten it by hand, and then tighten it with the wrench/pliers.
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 make heat insulation
treatment, as shown in the Fig. 4.12.
Use the medium-sized sponge to insulate the coupler of the gas pipe.
