A.O. Smith Innovo 12-160, Installation, Service & Maintenance Manual

Page: 42 / 92

8.7 Venting system
There are several alternatives for installation of the air inlet and flue gas outlet:
Installation
type Version Description
B23 Open Air for combustion is drawn from installation room
and the flue gasses leave the water heater via a
vertical roof terminal.
C13 Closed Concentric and/or parallel venting system, with
horizontal air inlet and flue gas outlet, in same
pressure zone.
C33 Closed Concentric and/or parallel venting system, with
vertical air inlet and flue gas outlet, in same
pressure zone.
C43 Closed Water heaters on common air inlet and flue gas
outlet (concentric and/or parallel) in a multiple
floor building.
C53 Closed Separate air inlet and flue gas outlet terminal
types mixed. Air inlet and flue gas outlet
termination may be in different pressure zone.
C63 Closed Water heaters supplied without venting materials.
These water heaters must be installed in
compliance with local regulations. The water heater
is intended to be connected to a separately
approved and marketed venting system.
This manual does not discus installation type B23. When you need a B23 system, contact
A.O. Smith for more information.
Caution
Always make sure that the flue gas outlet discharges into an area approved for the
correct type of installation.
Caution
The use of a different wall or roof terminal can result in incorrect functioning of the water
heater. Use the part number from the table to order a terminal set from your supplier or
the manufacturer.
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42 Installation, Maintenance and Service part