AUKS AL-H18/4DR1(U), Service Manual

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AUKS DC Inverter 1 Drive1 50HZ R410A Universal outdoor unit
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8.2 Connection piping installation
Piping installation precaution
Please choose the phosphorus deoxidation seamless copper pipe as the piping.
◇ If use the lengthen piping needs welding:
Please welding before fasten the nut, when welding using nitrogen gas to replace the air in the pipe in
order to prevent oxidation.
◇
If there are many points to be welded when installing the lengthen piping, please set a filter in the
pipe(buy from local market)
◇
Please use nitrogen gas or air to remove the dust and water in the pipe,
◇
Please lay out the piping according to the tend towards of the piping, but it is not allowed more than 3
times curved at the same point of the pipe(if do like this the pipe will become rigid)
◇ Pipe bending machine is used during the process of bending the pipe, the curvature shall not be too
small or it will affect the refrigerant flow.
Piping specification selection
As to the detail selection please take reference to the cooling capacity adjust index figure during different
installation situations.
Piping diameter Tighten torque
Expanding size
(A)
Expanding shape Paint the frozen oil
1/4in(φ6.35mm) 15-19(N·m) 8.3-8.7mm
3/8in(φ9.52mm) 35-40(N·m) 12.0-12.4mm
1/2in(φ12.7mm) 50-60(N·m) 15.4-15.8mm
5/8in(φ15.88mm) 62-76(N·m) 18.6-19.0mm
3/4in(φ19.05mm) 70-75(N·m) 22.9-23.3mm
Piping connection
◇ Using expanding machine to expand accessories, the size of horn shown in the above figure:
◇ Paint a thin layer of frozen oil at both inside and outside part of the expanding.
◇
Make the expanding right to the screw thread shape connection of the indoor unit, using hands to
tighten the nut then using a wrench to tighten the nut again, the tighten torque as follows figure.
◇
Take out the cover of the indoor unit gas valve and liquid valve, make the expanding right to the stop
valve of outdoor unit, using hands to tighten the nut then using a wrench to tighten the nut again, the
tighten torque as follows figure.
Equivalent pipe length conversion
Equivalent pipe length means converting pipe elbow to straight pipe length after considerate the
pressure loss.