DC Inverter Multi VRF System
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4.3.1 Flaring Process
(1) Use pipe cutter to cut pipe to avoid misshaping.
(2) Keep the pipe downward in case cutting scraps get into the pipe. Clear away the burrs
after cutting.
(3) Remove the flared nut from the valve on both the indoor and outdoor units. Then use
flaring tool to fix the flared nut into the pipe (as shown in Fig.10).
(4) Check if the flared part is flaring evenly and if there is no crack.
Fig. 10
4.3.2 Pipe Bending
(1) Extend the pipe by hand. Be careful not to crimp it.
(2) Do not bend the pipe more than 90°.
(3) If pipe is repeatedly bent or stretched, it will weaken making it more likely to break. Do
not bend or stretch the bend for over 3 times.
(4)
For best results, cut insulation before bending, as shown in Fig.12. Bend pipe as needed and secure
insulation with tape
.
Fig. 11 Fig. 12
4.3.3 Indoor Pipe Connection
(1) Remove pipe cover and pipe plug.
(2) Direct the flared part of copper pipe to the center of screwed joint. Twist on the flared nut
tightly by hand, as in Fig. 13. (Make sure indoor pipe is correctly connected. Improper alignment of
the center will prevent flared nut from being securely fastened. Thread of nut will get damaged if
not aligned correctly.)
(3) Use torque wrench to tighten the flared nut until the wrench gives out a click sound.
(Hold the handle of wrench at right angle to the pipe. as in Fig. 14)
