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This design complies with CAN 1-4.3-77 and ANS1
Z21. 1 0.3b 1994 as an instantaneous gas water heater. In
addition the unit complies with CAN1-2. 1 7-M80 for use at
high altitude, 2.000-4.5000 feet above sea level.
Instalation, operation and maitenance information is provided
in this manual. Installation and operation instructions should
be thoroughly reviewed before proceeding with installation
of the BOSCH instantaneous gas water heater.
INSTALLATION INSTRUCTIONS
Note: Proper plumbing, venting, gas connections and an
adequate supply of combustion air are required for
safe and reliable operation. Ability equivalent to that
of a licensed tradesman in the field involved is required
for installation and/or servicing of these water heaters.
LOCATION
Before installing the BOSCH instantaneous gas water
heater consideration must be given to proper location. The
BOSCH W125K... instantaneous gas water heater may be
installed to supply hot water to remote locations. Location
should be as close to a chimney or gas vent as practical, in
an area with an adequate air supply and as centralized with
the piping system as possible. The heater should not be
located in an area where it will be subject to freezing. The
heater should be located in an area where leakage of the
heater or its connections will not result in damage to the
area adjacent to the heater or to lower floors of the structure.
Note: When such locations can not be avoided, it is
recommended that a suitable drain pan, adequately
drained, be installed under the heater. The pan must
not restrict combustion air flow.
AIR REQUIREMENTS
For safe operation, sufficient air for combustion, ventilation
and dilution of flue gases must be available. An insufficient
supply of air will result in a yellow luminous burner flame,
causing carboning or sooting of the heat exchanger.
All manuals and user guides at all-guides.com
The BOSCH instantaneous gas water heater is designed to
operate on natural or propane gas; however, make sure that
gas on which heater is to operate is the same as specified
on the heater's model/rating plate.
In addition to these instrutions,the water heater shall be
installed in accordance with CAN1-B149 Installation Code
(in Canada) or ANSI Z223-1/NFFA 54 National Fuel Gas
Code (in U.S.) and/ or local installation cades. These shall
be carefully followed in all cases.
In unconfined spaces, in buildings of normal construction,
infiltration normally is adequate to provide air for combustion,
ventilation and dilution of flue gases. However, a confined
space must be provided with two permanent openings to
provide combustion and ventilation air to the appliance. Each
opening shall have a free area of on square inch per 1,000
Btu/hr of total input rating of all the appliances in the
enclosure, but not less than 100 square inches. One opening
shall be within 12 inches of the top and one within 12 inches
of the bottom of the enclosure.
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 above are to be provided as follows:
1. When communicating with outdoors directly, or by
means of vertical ducts, each opening shall have a free
area of not less than one square inch per 4,000 Btu/hr of
total input of all appliances in the space.
2. When communicating with outdoors by means of
horizontal
ducts, each opening shall have a free area
of not less than one square inch per 2,000 Btu/hr of total
input of all appliances in the space.
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