36 | Installation
Greenstar FS
6 720 810 590 (2015/05)
6.8 Connecting flue gas accessories
Optional vent systems are:
• Twin pipe PVC / CPVC 2" / 3"
• Twin pipe PP 2” (50mm) / 3" (80 mm)
(M&G Duravent PolyPro and Centrotherm InnoFlue)
• Concentric PP 3" / 5" (80/125 mm) (Bosch)
Using the twin pipe adaptor:
▶ 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.
Using open venting:
▶ Use basket on the air intake.
Using concentric venting system:
Fig. 28 Horizontal venting system (telescopic concentric vent kit)
[1] Intake
[2] Exhaust
L 2 feet to 3 feet (610 mm to 915 mm)
▶ Install the concentric vent adaptor with the screws enclosed.
The twin pipe adaptor is supplied with the boiler kit as
standard and is certified as a part of the vent system.
To avoid premature wear of the gaskets DO NOT use
lubricants.
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.
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