Strebel S-WG 100, Installation, Operating And Maintenance Manual, Page: 22 / 125

E09.012.246 Manual S-WG
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Height A
This is the height of the air inlet. A rain hood should pre-
vent rainwater entering the air supply system.
When the inlet and outlet are mounted on a flat roof, the inlet
should be at least 60 cm above the roof surface and at least
30 cm above the maximum snow level.
Example 1:
When the maximum snow level on the roof surface is 45 cm
then the air inlet should be at 45+30=75 cm. 75 cm is more
than the minimum 60 so the height will be 75 cm.
Example 2:
When the maximum snow level on the roof surface is 15 cm
then the air inlet should be at 15+30=45 cm. 45 cm is less
than the minimum 60 cm so the height will be 60 cm.
Height B
This is the height of the flue outlet related to the air inlet.
The flue gas outlet should be at least 70 cm above the air in-
let. It is advised to be equipped with a conical outlet.
A single flue outlet should be situated at least 100 cm
above the roof surface.
Distance C
The horizontal distance between the flue gas pipe and air
inlet pipe at roof level.
This distance should be at least 70 cm.
6.4 Flue system classification B23P
Overpressure flue gas systems
For classification B23P and for overpressure flue gas systems the minimum requirements of the flue gas mate-
rial for S-WG appliances can be determined in a designation string according to the EN1443 (see table).
CE string flue gas
material (B23P)
European
standard Tem-
pera-
ture
class Pres-
sure
class Resis-
tance to
conden-
sate Corrosion
resistance
class Metal:
liner
specifi-
cations Soot fire
resis-
tance
class Distance
to combus-
tible mate-
rial Plastics:
location Plastics:
fire beha-
viour Plastics:
enclo-
sure
min. requirement PPs EN 14471 T120 P1 W 1 O 30 I or E C/E L
min. requirement StS EN 1856-1 T120 P1 W 1 L20040 O 40
A few examples of flue gas material suitable for S-WG water heaters:
CE String for Plastic PPs: EN14471 T120 P1 W 2 O(30) I C/E L
CE String for Stainless Steel: EN1856-1 T250 P1 W V2-L50040 )(50)
When selecting flue gas systems, be aware that the minimum requirements are met. So only select flue gas
materials having the same or better properties than this table.
6.5 Flue system classification C63
In general, appliances are certified with their own flue gas material. If a water heater is C63 certified, no specific
type flue gas material has been certified in combination with the water heater. In this case the flue gas material
does not need to be certified in combination with the water heater but should be fit for purpose, and comply with
the applicable European standards. It must be able to handle the condensate forming and transport, overpres-
sure and must have a minimum temperature class of
T120 .