2. Guideline for each installation process
3
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Heat pump 50Hz/R410A
Part 3 Design and installation
2.1 Sleeve and insert work
2.1.1 Positioning of the pipe holes
1) The through holes for the drain piping should be positioned such that pipes have a downward gradient (the gradient must
be at least 1/100.The thickness of the insulating materials must also be taken into consideration.)
2) The diameter of the through holes for the refrigerant piping should include an allowance for the thickness of the heat insu-
lation materials.
3) Attention should be paid to the construction of the beam themselves since there are sometimes parts of the beam which
cannot be used to accommodate through holes.
2.1.2 Selection of sleeve
Sleeve work should be performed to make a space for passing pipe and wire through the wall or ground under
construction.
For example if gas pipe and liquid pipe is 12.7mm , 6.35mm the sleeve diameter is minimum 79.05mm .
* Assumption : Gas pipe insulation thickness and liquid pipe insulation thickness is 10mm and 10mm respectively
Gas pipe diameter
12.7mm
Liquid pipe diameter
6.35mm
Insulation thickness(gas pipe)
10mm x 2
Insulation thickness(liquid pipe)
10mm x 2
20mm surplus
20mm
Total sleeve diameter
79.05mm
