Navien KDB-535GTD Installation Manual page 21

M e d i u m - s i z e d g a s b o i l e r
Installation of the chimney pipe
■ The exhaust duct shall be made of the stainless steel (pipe) or the heat- and corrosion-
resistant metal.
■ The exhaust duct shall be connected, if necessary, to the boiler tightly not to be pulled
out or shaken.
■ If the exhaust duct passes through the combustible wall or the ceiling made of
combustible material, the exhaust duct shall be heat insulated with a non-flammable
material with a thickness of more than 20mm, and kept at least 50mm away from the
wall or the ceiling. In addition, the exhaust duct, if passing through the ceiling, shall be
equipped with the inspection hole.
■ The exhaust duct shall be installed as a single unit, if possible. Never use the exhaust
duct in common with the heaters of the natural exhaust type or those using other fuel
(briquette, petroleum).
■ The air intake shall be provided in a well-ventilated place such as the outdoors, into
which the exhaust gas emitted from the exhaust duct does not flow.
(※ Make sure that failure of air intake and ventilation causes oxygen deficiency,
eventually leading to incomplete combustion.)
■ Bore holes in the wall to install the vent on the upper side of the wall and the air intake
on the lower side, to facilitate ventilation.
■ The effective cross-sectional area of the air intake or the vent shall be larger than that of
the exhaust duct.
■ The bird protection net shall be installed on top of the exhaust duct so that birds, mice or
objects with a diameter of more 16mm can not go into the exhaust duct.
■ A space of more than 300mm shall be provided between the top of the exhaust duct and
the outer wall surface, if non-flammable.
If the exhaust duct is to be installed and concealed into the ceiling, the connection points
shall be securely connected to prevent exhaust gas leakage. Then, wind a non-flammable
material, other than the metal, around the connection points.
Finish the connection points using the heat resistant silicon (except for the plaster bandage).
Install the inspection hole to check and repair the exhaust pipe in a dark side.
In order to extend the exhaust pipe, install one hanger at least every 900mm and tighten the
installed hangers securely. (in case of the pipe extension with a length of more than 1m)
Incorrect installation of the exhaust pipe may cause deteriorated performance of the
product as well as a disaster. Consequently, the installation shall be performed in
accordance with this manual.
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