Bosch WR430-7K - Manuel (Page 4)

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FORWARD
The design of the WR430-7K complies with CAN 1-4.3
and ANSI Z21.10 (latest edition) as an instantaneous gas
water heater. In addition, the WR430-7K also complies with
CAN 1-2.17 for use at high altitudes, 2,000 - 4,500 ft. above
sea level.
Installation, operation and maintenance instructions are
provided in this manual. Installation and operation
instructions should be thoroughly reviewed before
proceeding with installation of the BOSCH instantaneous
gas water heater.
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 service of these water
heaters.
LOCATION
Before installing the BOSCH instantaneous gas water
heater, consideration must be given to proper location. The
location should be as close to outside vent termination as
practicable, 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. See venting page 6.
Note: When such locations cannot be avoided, it is
recommended that a suitable drain pan, adequately
drained, be installed under the water heater. The pan
must not restrict combustion air flow.
ELECTRICAL
A grounded switched plug receptable must be provided
immediately below the left hand corner of heater to accept
and provide power to supplied 3 ft. (0.9m) appliance cable
and plug.
INSTALLATION INSTRUCTIONS
The Bosch WR430-7K is a high efficiency fin tube heater and should not be installed and operated during construction or
building renovations if location is exposed to above normal dust levels. This can cause dust build up in the finned heat
exchanger and result in damage to heater and be a hazard to health.
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 instructions, the water heater shall be
installed in accordance with CAN/CGA-B149 Installation
Code (in Canada) or Z223.1-latest edition, National Fuel
Gas Code (in U.S.A.) and/or local installation codes. These
shall be carefully followed in all cases.
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.
In order to prevent corrosion, make sure that the combustion
air is kept free of aggressive substances. Substances that
especially contribute to corrosion are halogenated
hydrocarbons (e.g., chlorine and fluorine) which are
contaned in solvents, paint, adhesives, propellant gases,
various household cleaners, etc. Take precautionary
measures as necessary.
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 one square inch per 1,000
Btu/Hr* of total input rating of all the appliances in the
enclosure. One opening shall be within 12 inches of the
top and one within 12 inches of the bottom of the enclosure.
* Special Note
When the WR430-7K is installed in a confined space of
minimum size the openings described above must be
increased in to a size of 1-1/2 square inches per 1,000
BTU/Hr. In other words, when installed in a minimum sized
confined space the two openings that are to be made in
the enclosure within 12 inches of the top and 12 inches of
the bottom must each have a minimum free area of, (1 -
1½” - 2" x (130) = 195 square inches.