Fujitsu AUYG18LVLB Design & Technical Manual page 212

4. Place the branch pipe in a horizontal position as far as possible.
a. Only place the branch pipe as shown below during unavoidable circumstances.
b. When connecting the main piping, do not bend it near the connection section. If the main
pipe must be bent due to unavoidable circumstances, ensure that the linear section is 10
times or more than the diameter of the connection piping.
5. Welding the piping
• Check that the connection piping is securely inserted into the branch pipe before welding.
CAUTION
• During piping work, apply nitrogen gas while brazing the pipes. If pipes are brazed without ap-
plying nitrogen gas, it will create a large amount of oxidation film, which will cause a critical
malfunction.
• To prevent moisture or foreign matter from entering during work, do not leave the piping open.
• Refer to installation manual supplied with the outdoor unit for sealing test evacuation proce-
dures.
• Do not weld the rubber on the branch pipe. (UTP-SX372A only)
6. Installing the cable tie (UTP-SX372A only)
a. Install the cable tie as shown in the following.
b. After installing the cable tie, cut away the excess portion neatly.
3-4. Branch pipes
Horizontal
position
to indoor unit to indoor unit
ØD
Straight pipe =
Main pipe
(D x 10) and above
R
to outdoor unit
Cable tie
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3. Pipe installation