Caution
Install the manual gas valve on a spot accessible for the user.
Install the gas connection:
1.
Install the manual gas valve (10) in the gas supply pipe.
2.
Make sure that the gas pipe is clean before use. If necessary, remove the
contamination from the pipe.
3.
Close the manual gas valve.
4.
Install the gas supply pipe to the gas control valve.
5.
Make sure that there are no gas leaks.
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 flue gas outlet via a horizontal wall or 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 venting system is mounted into an area suitable 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.
c
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