Potterton eurocondense four 125 kw, Installation, Operation And Maintanance Manual, Page: 47 / 148

6.4.4 Chimneys already in use
If a chimney used before for oil or solid fuel-fired boilers is used as a duct
for installation of a concentric exhaust gas pipeline, the chimney must be
thoroughly cleaned first by a specialist.
Note
Concentric flue gas routing, also in the duct, also in the shaft, is
absolutely necessary The concentric flue gas pipe must run
straight in the duct.
Multiple usage of air/flue gas chimneys of different manufactur­
ers
The selected air/flue gas chimney must have approval by the
building supervisory authority DIBt for multiple usage opera­
tion suitability.
Diameter, heights and maximum number of devices can be
taken from the design tables of the approval certificate.
Height above the roof
With regard to the minimum height above the roof, country-
specific regulations regarding chimneys and flue gas systems
are applicable.
6.4.5 Assembly of the flue gas system
Warning
Danger of injury by not wearing working gloves.
Working gloves must be worn during assembly of the flue gas sys­
tem.
Mounting with gradient
The flue pipe must be routed at a gradient to the EC four so that the con­
densation from the flue pipe can drain from the flue pipe to the central con­
densation collector of the EC four.
The min. downward slopes are:
horizontal flue pipe: min. 3° (min. 5.5 cm per metre)
external wall duct: min. 1° (min. 2.0 cm per metre)
Shortening of the pipes
All simple and concentric pipes may be shortened. After cutting, the ends
of the pipes have to be thoroughly de-burred. When a concentric pipe is
shortened, a piece of pipe at least 6 cm long must be cut off the outer
pipe. The spring washer for centring the inner pipe becomes obsolete.
Minimum dimensions of the duct
Outer Ø cou­
pling
Min. duct inner dimension
System
D
[mm]
short side A
[mm]
round B
[mm]
SAS 160 (DN 160) 184 225 245
SAS 200 (DN 200) 227 256 276
Back ventilation
For room air-depending operation of the gas condensing boiler with the
SAS 160 and SAS 200 the duct below the flue gas connection in the in­
stallation room must be provided with back ventilation. The clear cross-
section must be at least A
min
= 125 cm
2
. A respective air intake grid is
available as accessory.
Fig.24 Minimum dimensions of the duct
RA-0000159
6 Installation
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