Bosch WR 400-7.K Series Installation & Operation Manual page 4

For either a confined or unconfined space in a building of
tight construction with inadequate infiltration, air must be
drawn from the outdoors or from spaces that freely
communicate with the outdoors. Two permanent openings
located as indicated are to be provided as follows:
1. When communicating with outdoor directly, or by
means of vertical ducts, each opening shall have a
free area of not less than one square inch per 4000
BTU/Hr of total input of all appliances in the space.
2. When communicating with outdoor by means of
horizontal ducts, each opening shall have a free area
of not less than one square inch per 2000 BTU/Hr of
total input of all appliances in the space.
For detailed requirements see:
- in Canada, CAN 1-B 149 Installation Codes
- in U.S.A., ANSI Z223. 1 - latest edition, National Fuel
Gas Code.
WARNING!
1. Flammable materials, gasoline, pressurized containers,
or any other items or articles that are potentially fire
hazards must never be placed on or adjacent to the
heater. The appliance area must be kept free of all
combustible materials, gasoline and other flammable
vapors and liquids.
2. Do not obstruct the flow of combustion and ventilation
air to the appliance.
CLEARANCE
The WR400-7.K.. is designed certified for installation on a
combustible wall and for installation in an alcove or closet
with minimum clearances to combustible construction of 0
mm from back, 102 mm (4 inches) from sides, 305 mm (12
inches) from top an bottom, and 102 mm (4 inches) from
front. A minimum of 305 mm (12 inches) shall be allowed for
maintenance of serviceable parts. Clearance from vent is
dependant upon the clearance rating of the venting material
used; that is, type B-1 vent is approved for 1 inch clearance,
B-2 vent for 2 inches, etc.
Warning!
Check Flue Gas Safety Device good functioning, please pro-
ceed as explained in "Flue gas safety device" page 9.
THIS APPLIANCE MUST BE INSTALLED IN ACCORDANCE WITH THE NATIONAL FUEL GAS CODE
ANSI Z223. 1 - latest edition in U.S.A. or CAN/CGA- B149 INSTALLATION CODES IN CANADA, LOCAL
CODES AND/OR THE REQUIREMENTS OF THE AUTHORITY HAVING JURISDICTION MUST BE
FOLLOWED.
4
MOUNTING
The WR400-7.K.. is designed certified for mounting to a wall.
The heater must not be installed on a carpeted wall. The
heater must be mounted to the wall using appropriate
anchoring materials.
Note: If wall is a stud wall sheathed with plasterboard it is
recommended that support board(s), either 1x4's or
½'' (minimum) plywood first be attached across a pair
of studs and then the heaters should be attached to
the support boards. See Figure2.
Figure 2
Expansion and contraction of piping due to changing water
temperature in the pipes imparts movement to the heater
which, if mounted directly to a brittle, friable board, such as
plasterboard, can cause failure of mounting.
WALL STUDS
SUPPORT BOARD
1" X 4"
SPACE BOARD
6 720 606 560