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240FX
INDOOR INSTALLATION
REMOVE OUTDOOR VENT CAP AND ∗ CUT PRESSURE SWITCH JUMP WIRE INSIDE UNIT THEN INSTALL
4" VENTING DIRECTLY ON FLUE OUTLET.
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.
In general these requirements specify that if the unit is installed in a confined space, there must be a permanent
air supply opening.
Water heater size
165,000 BTU
The area indicated is for one of two openings one at floor level and one at ceiling, so the total net free area would
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.
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.
©BBT NORTH AMERICA
Bosch Group
FOR INDOOR INSTALLATION
Combustion Air Supply
DO NOT INSTALL DIRECTLY ON ANY COMBUSTIBLE SURFACE
Minimum recommended Air supply to water heater
Outside air area
42 Sq. IN
be double the figures indicated.
Venting Instructions.
Use a UL listed wall terminator for cat 3 appliance
Inside air area
165 Sq. IN
340 Mad River Park, Waitsfield, VT 05673
TWH-TK-01
page 3 of 4
rev 01/06
Bosch Water Heating
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