McQuay MQS-174018-CFC216A Installation And Operation Manual page 21

(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.
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of 150
①.
mm or over.
If the pipe is bent repeatedly at the same place, it will break.
②.
5.3.3 Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
Be sure to apply the pipe against the port on the indoor unit correctly. If the centering is improper,
①.
the flare nut cannot be tightened smoothly. If the flare nut is forced to turn, the threads will be
damaged.
Do not remove the flare nut until the connection pipe is to be connected so as to prevent dust and
②.
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.
DC Inverter U-match Series Floor Ceiling Type Unit
CAUTION!
CAUTION!
19
Fig. 4.10