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Outdoor Installation with Add-On Condensing Heat Exchanger
Outdoor models are self -venting when installed with the factory-supplied non-restricted direct vent cap and require no
additional vent piping. This special vent cap is provided with the boiler in accordance with AGA/CGA requirements. It
must be installed directly on the boiler in a horizontal position. Notching of the vent cap mounting flange may be neces-
sary to clear outlet piping on some models. See Section B for correct clearances.
Care must be taken when locating the outdoor unit because the flue gases discharged from the vent cap can condense as
they leave the cap. Improper location can result in damage to adjacent structures or building finish. For maximum effi-
ciency and safety, the following precautions must be observed:
a) Outdoor models must be installed outdoors and must use the non-restricted direct vent cap supplied by the
manufacturer.
b) Periodically check venting system. The boiler’s venting areas must never be obstructed in any way and minimum
clearances must be observed to prevent restriction of combustion and ventilation air. Keep area clear and free of
combustible and flammable materials.
c) Do not locate adjacent to any window, door walkway, or gravity air intake. The vent should be located four (4) feet
horizontally from such areas.
d) Install above grade level and above normal snow levels.
e) A venting system shall terminate at least 3 feet above any forced air inlet located within 10 feet.
f) Adjacent brick or masonry surfaces must be protected with a rust-resistant sheet metal plate.
g) Multiple Outdoor Vent installations require a four (4) feet clearance between vent caps.
NOTICE: :Condensate can freeze on the vent cap. Frozen condensate on the vent cap can result in a blocked flue
condition.
The Stainless Steel non-restricted vent cap must be furnished by the boiler manufacturer in accordance with its listing.
The outdoor vent terminal must be installed in a horizontal position to prevent recirculation of flue products. The vent cap
must be mounted directly on the vent pipe of the boiler.
NOTICE: :In areas of high winds (alleyways, air handlers, etc...), a downward 90° - elbow must be mounted on the
combustion air inlet to prevent any air flow fluctuation.
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