Installation
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
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6.9 Connecting the flue gas accessories
Optional vent systems are:
• Twin pipe PVC / CPVC 2" / 3"
• Twin pipe PP 2” (50mm) / 3" (80mm)
(M&G Duravent PolyPro and Centrotherm InnoFlue)
• Concentric PP 3" / 5" (80/125 mm) (Bosch)
Using the twin pipe adapter:
The twin pipe adaptor is supplied with the boiler kit as standard and is
certified as a part of the vent system.
▶ Peel the backing of the gasket [1] and attach to the underside of the
vent flange so that the holes line up[2]
▶ Remove three screws from the top of the appliance, align the vent
flange to the open screw holes then secure the vent flange with the
three screws that were just removed or the three screws provided.
Fig. 26 Attaching the vent flange and gasket
[1] Gasket
[2] Vent flange
[3] Screws
▶ Insert the flue gas adapter as far as it will go into the vent flange and
align it.
Fig. 27 Flue gas adapter
[1] Combustion air test port
[2] Flue gas test ports
[3] Flue gas adapter
[4] Vent flange
▶ Tighten the screws
To avoid premature wear of the gaskets DO NOT use lubricants.
Using open venting:
▶ Use a basket on the air intake
Using concentric venting system
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 (610mm
to 915mm).
For more details on connecting the flue system, refer to the installation
instructions for the flue kit.
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