Installation Of Connection Pipe - Lennox VEP034N432US User Manual

DC Inverter Multi VRF System

4.3 Installation of Connection Pipe

4.3.1 Precautions for the Installation of Connection Pipe
(1) Conform to the following principles during pipe connection: Connection pipe should be as
short as possible, so is the height difference between indoor and outdoor units. Keep the
number of bends as little as possible. Radius of curvature should be as large as possible.
(2) Weld the connection pipe between indoor and outdoor units. Please strictly follow the
requirements for welding process. Rosin joint or pin hole is not allowed.
(3) Radius of bending parts should be over 200mm. Note that pipes cannot be repeatedly bent
or stretched; otherwise the material will get harder. Do not bend or stretch the pipe for more
than 3 times at the same position.
4.3.2 Flaring Process
(1) Use pipe cutter to cut the connection pipe in case it is unshaped.
(2) Keep the pipe downward in case cutting scraps get into the pipe. Clear away the burrs after
cutting.
(3) Remove the flared nut connecting indoor connection pipe and outdoor unit. Then use flaring
tool to fix the flared nut into the pipe (as shown in Fig.13).
(4) Check if the flared part is flaring evenly and if there is any crack.
4.3.3 Pipe Bending
(1) Reshape the pipe by hand. Be careful not to damage the pipe.
(2) Do not bend the pipe over 90°.
(3) If pipe is repeatedly bent or stretched, it will get hard and difficult to bend and stretch again.
Therefore, do not bend or stretch the bend for over 3 times.
(4) In case that direct bending will open cracks to the pipe, first use sharp cutter to cut the
insulating layer, as shown in Fig.15. Do not bend the pipe until it is exposed. When bending
is done, wrap the pipe with insulating layer and then secure it with adhesive tape.
Fig. 13
Fig. 14
15
Fig. 15