Installation Of The Exhaust And Air Intake System - Bosch Greenstar Series Installation And Service Instructions For Contractors

Notes on installation and operation
▶ Install the concentric vent adaptor with the screws enclosed.
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4
Fig. 29 Installing the concentric vent adaptor
[1] Concentric vent adaptor
[2] Screws
[3] Combustion air test port
[4] Flue gas test port
For atmospheric combustion, the supply air connection must be
provided with a safety mesh.
6.8.1

Installation of the exhaust and air intake system

NOTICE
▶ Vent connectors serving appliances vented by natural draft shall not
be connected to any portion of mechanical draft systems operating
under positive pressure.
NOTICE
Burner damage!
▶ Avoid drawing in combustion air excessively loaded with dust or
airborne particles.
DANGER
▶ Ensure that the flue pipes and seals are not damaged.
▶ Use only sealing compounds (primer and glue) approved with the
vent material.
▶ Never install a barometric nor a thermally controlled vent damper
with this boiler.
▶ Connect only one boiler to each flue system or chimney flue.
▶ Do not route the flue system piping through or inside another duct
that is used for exhausting air or other flue gases.
▶ The condensate trap must be primed at all times. Failure to do so may
allow combustion gases to escape into boiler room.
▶ External insulation on plastic vent pipe is prohibited.
Consult local and state codes pertaining to special building code and fire
department requirements. Adhere to national code requirements.
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6 720 806 992-01.1O
Observe the listed maximum lengths of vent system, which are boiler
model dependent ( chapter 6.8.3).
DANGER
Improper venting of the Greenstar boiler can result in excessive
levels of carbon monoxide which can result in severe personal injury
or death.
▶ The boiler must be vented in accordance with the Venting of
Equipment section of the latest edition of ANSI Z 223.1 / NFPA 54
Natural Fuel Gas Code and/or the Venting systems and air supply for
appliances section of the latest version of CAN/CGA B149.1 Natural
Gas and Propane Installation Code in Canada and in accordance with
all applicable local building codes.
NOTICE
▶ To prevent moisture and frost and ensure the minimum clearances to
openings and neighboring buildings, 45° and 90° elbows or T-pieces
may be attached to the flue outlet in order to direct flue gas away from
neighboring buildings. The total allowable vent length, maximum
number of elbows and distance to air intake restrictions must be
adhered to.
Optional vent systems are:
• Direct vent installations (sealed combustion)
Direct vent installations (sealed combustion)
For direct vent applications all applicable items below must be met.
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X
Fig. 30 Vent and combustion air pipe position of a sealed combustion
system
[1] Intake
[2] Exhaust
X At least 1 foot (305 mm)
Vent termination must be at least 1 foot (305 mm) below, 1 foot
(305 mm) horizontally away from or 1 foot (305 mm) above every door,
every window or every air opening in any building ( Fig. 31 [2], [X
[X ], page 31).
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2
X
6 720 641 933-19.1O
Greenstar – 6721822579 (2021/01)
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