KA IMO 2021 6 V2.1

20 systemair
2.3.4 Connection of piping
Heat exchangers must be connected to the piping in a manner that enables the free opening of the service doors of
adjacent sections and allows the dismantling and drawing out of heat exchanger components when necessary for
maintenance or replacement purposes.
In order to allow condensate discharge from the pan in the event of negative pressure in the unit, respectively, or in
ordertopreventairleakagefromtheunitintothedrainpipeintheeventofpositivepressureintheunit,anegative
pressure or positive pressure syphon must be installed.
Caution
Ifthepipeconnectionsareterminatedontheinsideofthedevice,aholemustbedrilledinthexed
panel to connect the connections to the external manifolds.
• [1]Thepointwhereyouwanttomakeapassageistobelocatedonthepanel,andaholeisdrilledthroughitwitha
holesawwithdimensionascloseaspossibleaccordingtothetablebelow(seethe“Hole”column).
• [2] The piping is mounted through the hole as centered as possible.
• [3] An insulating tube is mounted on the pipe through the hole according to the table below (see column
“Insulation”).Thelengthofthetubemustbeatleast100mmsothatthepipeontheoutsidecoversthepanelat
and no insulation is visible. The inner tube faces inside at least 50 mm.
• [4]Ontheoutside,arubberrosetteisattachedtothetubeaccordingtothetablebelow(seecolumn“Rubber”).The
rosette is glued to the panel from the outside and must be aligned with the panel.
• After connecting the external installation, the external pipes must be thermally insulated up to the rubber rosette.
Dimension Coper tube Steel tube
DN Insulation Hole Rubber Insulation Hole Rubber
mm inch mm mm mm mm mm mm
10 3/8 12 x 19 44 10/75 18 x 19 51 15/75
15 1/2 15 x 19 51 15/75 22 x 19 56 20/90
20 3/4 22 x 19 56 20/90 28 x 19 65 25/90
25 1 28 x 19 65 25/90 35 x 19 70 30/90
32 1 1/4 35 x 19 70 30/90 42 x 19 79 40/110
40 1 1/2 42 x 19 79 40/110 48 x 19 79 45/116
50 2 54 x 19 92 50/100 60 x 19 92 56/131
65 2 1/5 64 x 19 102 60/130 76 x 19 111 71/142
80 3 76 x 19 111 71/142 89 x 19 121 82/150
100 4 108 x 19 140 100/170 114 x 19 152 112/180