Precaution For Connection - Gree R410A Service Manual

6.8 Precaution for Connection

6.8.1 Precaution for connection
1) Pipe connections should be follow the following rules:
① Outdoor unit shall be installed close to the indoor unit, hence to minimize the length and bends of connection
pipes.
② The height gap of outdoor unit and indoor units should be as small as possible
2) The brazing operation must be strictly in accordance with the process requirements. During the installation,
do not damage the pipeline.
6.8.2 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.
6.8.3 Precaution for elbow operation
① The elbow operation could be done by hands. Be careful and do not damage the pipe.
② The bending diameter of the pipeline must be greater than 200mm. The connection pipe cannot often be bent
or straightened. Otherwise it will harden and crack.
③ If the thermal insulation of the refrigerant pipe is not removed, please do not bend the pipe. Otherwise, it
maybe leads the pipe to crack. It is better to make an incision with a knife in the thermal insulation and
removes it. After elbow operation is finished, recover the thermal insulation with binding band.
6.8.4 The process of install refrigerant pipes
① Remove the screw caps from the pipes.
Align the flared end of copper tube with the center of pipe joint. Tighten the nuts by hands. (If the flared end
②
of copper tube and the center of pipe joint are not in coaxial, it is hard to tighten the nuts by hands, please do
not tighten it with spanners, because the screw thread may be broken by force).
③ Tighten the flaring nuts with torque wrench until you hear a "click". (The spanner and torque wrench should
be perpendicular to the refrigerant pipeline).
④ The following table for the torque required to tighten the nuts.
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