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6.8
Connecting flue gas accessories
Optional vent systems are:
• Twin pipe PVC / CPVC 2" / 3"
• Twin pipe PP 2" (50 mm )/ 3" (80 mm) (M&G Duravent PolyPro and
Centrotherm InnoFlue)
• Concentric PP 3" / 5" (80/125 mm) (Bosch)
In case of using the twin pipe adaptor:
The twin pipe adaptor is supplied with the boiler kit as standard and is
certified as a part of the vent system.
▶ Install the vent flange and gasket with the screws enclosed.
2
1
Fig. 26 Attaching the vent flange and gasket
[1]
Gasket
[2]
Vent flange
[3]
Screws
Greenstar – 6721822579 (2020/03)
▶ Insert the flue gas adapter as far as it will go into the vent flange and
align it.
3
Fig. 27 Flue gas adapter
[1]
[2]
[3]
[4]
▶ Tighten the screws.
To avoid premature wear of the gaskets DO NOT use lubricants.
In case of open venting:
▶ Use basket on the air intake.
In case of concentric venting system:
6 720 612 737-01.1O
As an alternative to twin pipe venting, a purposely designed and built
telescopic concentric vent kit can be obtained as an accessory from
Bosch Thermotechnology for a horizontal direct vent wall termination.
This vent system can be used for vent lengths of 2 feet to 3 feet (610 mm
to 915 mm).
For more details on connecting the flue system, refer to the installation
instructions for the flue kit.
Fig. 28 Horizontal venting system (telescopic concentric vent kit)
[1]
[2]
L
Notes on installation and operation
2
1
Vent flange
Flue gas adapter
Combustion air test port
Flue gas test ports
L
Intake
Exhaust
2 feet to 3 feet (610 mm to 915 mm)
3
4
6 720 641 933-85.1O
1
2
6 720 806 992-02.1O
35
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