Fujitsu AU G18LVLB Series Design & Technical Manual page 160

(5) Welding the piping
• Check that the connection piping is securely inserted into the branch pipe before welding.
• During piping work, apply nitrogen gas while brazing the pipes. If pipes are brazed without
applying 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 the Installation Manual supplied with the outdoor unit for sealing test evacuation
procedures.
• Do not weld the rubber on the branch pipe. (UTP-SX354
(6) Installing Cable tie (UTP-SX354
• Install the Cable tie as shown below.
Cable tie
(7) After brazing the pipes, use the supplied heat insulation to insulate them.
• Remove the protective sheet from the double-stick tape that is affixed to the heat insulation.
Twin connection type
• Use tape (locally purchased) to seal the seam so that there will be no gap at the junction between the aforementioned
heat insulation and the heat insulation on the local piping.
Twin connection type
Tape (locally purchased)
Tape (locally purchased)
• Be sure to install the heat insulation on liquid pipes and gas pipes. Unless they are thermally
insulated, water condensation can cause accidents or reduction in performance.
• After installing the heat insulation, if you worry about possible condensation due to the high
humidity of installation position, please use locally purchased heat insulation to reinforce
insulation.
Twin connection type
Heat insulation
(locally purchased)
CAUTION
□
only)
□
only)
• The installation position of the Cable tie is shown on the left.
• After installing the Cable tie, cut away the excess portion neatly.
Triple connection type ( Liquid )
Triple connection type ( Liquid )
CAUTION
Triple connection type ( Liquid )
- (04-18) -
Triple connection type ( Gas )
Triple connection type ( Gas )
Triple connection type ( Gas )