A.O. Smith TWI 35-200, Installation, User And Service Manual

Page: 41 / 92

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
0313279_TWISTER II_UKUK_
V1.1, 18-02-2019
41