TWH-TK-01
page 3 of 4
rev 01/06
Bosch Water Heating
340 Mad River Park, Waitsfield, VT 05673
©
BBT
NORTH AMERICA
Bosch Group
INDOOR
INSTALLATION
FOR INDOOR INSTALLATION
REMOVE OUTDOOR VENT CAP AND
∗
CUT PRESSURE SWITCH JUMP WIRE INSIDE UNIT THEN INSTALL
4" VENTING DIRECTLY ON FLUE OUTLET.
Use a UL listed wall terminator for cat 3 appliance
Combustion Air Supply
The water heater location must provide enough air for proper combustion. See the latest edition of ANSI Stan-
dard Z223.1 and any your local codes that should be applicable.
DO NOT INSTALL DIRECTLY ON ANY COMBUSTIBLE SURFACE
In general these requirements specify that if the unit is installed in a confined space, there must be a permanent
air supply opening.
Minimum recommended Air supply to water heater
Water heater size
Outside air area
Inside air area
165,000 BTU
42 Sq. IN
165 Sq. IN
The area indicated is for one of two openings one at floor level and one at ceiling, so the total net free area would
be double the figures indicated.
Outside air supply: when combustion air is supplied directly through an outside wall, such as intake louvers
openings into the dwelling. Each opening should give a minimum free area of one square inch per 4000 BTUH
input of the total input rating of all appliances in the enclosed area.
Inside air supply, when combustion air is supplied from inside the building, each opening of the closet door
should have a minimum free area of one square inch per 1000 BTUH input of the total input rating of all appliance
in the enclosed area. These openings should never be less than 100 Sq. IN.
Venting Instructions.
This water heater must be vented in accordance with Venting ofcategory 3 appliance, of the latest edition of the
National Fuel Gas Code.
WARNING :
Improper venting of this appliance can result in excessive levels of Carbon
Monoxide which
can
result in severe personal injury or death.
240FX
