22 | Technical description
UNIMAT6 720 807 794 (2013/04)
3.4 Connections
3.4.1 Flow and return
3.4.2 Flue outlet connection
At design spread and rated output Suggested internal diameter
1)
1) Flanged connections designed as PN16 to DIN 2633; the internal diameters given should be taken as suggestions but can be determined
individually. Depending on the design, the flow and return connectors are restricted for certain boiler sizes.
ΔT=15K ΔT=20K ΔT=30K ΔT=40K
[kW] [kW] [kW] [kW]
> 175 ≤ 275 > 235 ≤ 367 > 352 ≤ 550 > 470 ≤ 734 DN50
> 275 ≤ 465 > 367 ≤ 620 > 550 ≤ 931 > 734 ≤ 1241 DN65
> 465 ≤ 705 > 620 ≤ 940 > 931 ≤ 1410 > 1241 ≤ 1881 DN80
> 705 ≤ 1102 > 940 ≤ 1469 > 1410 ≤ 2204 > 1881 ≤ 2938 DN100
> 1102 ≤ 1722 > 1469 ≤ 2296 > 2204 ≤ 3444 > 2938 ≤ 4592 DN125
> 1722 ≤ 2479 > 2296 ≤ 3306 > 3444 ≤ 4959 > 4592 ≤ 6612 DN150
> 2479 ≤ 4408 > 3306 ≤ 5877 > 4959 ≤ 8816 > 6612 ≤ 11755 DN200
> 4408 ≤ 6887 > 5877 ≤ 9183 > 8816 ≤ 13775 > 11755 ≤ 18367 DN250
> 6887 ≤ 9918 > 9183 ≤ 13224 > 13775 ≤ 19200 > 18367 ≤ 19200 DN300
> 9918 ≤ 13500 > 13224 ≤ 18000 – – DN350
> 13500 ≤ 17633 > 18000 ≤ 19200 – – DN400
Table 15 Internal diameters of flow and return connections subject to design spread and rated output
Rated output
1)
1) Actual output (according to type plate)
Flue outlet internal diameter
2)3)
D
1
2) Dimensions to EN 12220
3) Recommended values; exact diameter is calculated for each specific project.
Flue outlet D
1
(external)
3)
[kW] – [mm]
≤ 827 DN200 213
> 827 ≤ 1350 DN250 256
> 1350 ≤ 2050 DN315 322
> 2051 ≤ 3307 DN400 400
> 3308 ≤ 5167 DN500 503
> 5168 ≤ 8203 DN630 634
> 8204 ≤ 10403 DN710 711
> 10404 ≤ 13227 DN800 797
> 13228 ≤ 16712 DN900 894
> 16713 ≤ 19200 DN1000 1003
Table 16 Flue outlet connection subject to the rated output
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