Cassette Type Air Conditioner Unit
15
(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. 4.12, 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.
Pipe
Cutter
Cutt line
Heat insulating
pipe
Fig. 4.12
CAUTION!
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.
4.3.3 Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
CAUTION!
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. 4.13)
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 4.4 to check if the wrench has been tightened properly (too tight
would mangle the nut and lead to leakage).
