Owner's Manual

BU Module
15
5.4 Precaution for Connection
CAUTION
1) Conform to the following principles during pipe connection: Outdoor unit shall be installed close to the
indoor unit, hence to minimize the length and bends of connection pipes; the height gap of outdoor unit
and indoor units should be as small as possible; the radius of curvature should be as large as possible.
2) The brazing operation must be strictly in accordance with the process requirements. Rosin joint or pin
hole is not allowed.
3) During the installation, do not damage the pipeline. The pipeline’s radius of bending must be over than
200mm (8inch). The pipes cannot repeatedly be bent or straightened. Otherwise it will get harden and
crack. Do not bend or straight the pipes for more than 3 times at the same position.
1) The process of flaring
① Using the tube cutter to cut the connecting pipe in the appropriate place and remove the burrs.
② Install the nut before the flaring operation.
③ Check the flared portion, whether there is fractured or not.
Fig. 21
2) Precaution for elbow operation
① The elbow operation could be done by hands. Be careful and do not damage the pipe.