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DRIP TRAY
If the water heater is being mounted above a floor of
combustible construction, the drip tray ( shipped loose in
the water heater) must be attached to the bottom of front
cover of the water heater at time of installation. The drip
tray should be attached to the front cover, using screws
provided, as shown in figure 3.
Failure to use drip tray when installing unit above a floor of
combustible construction will cause an unsafe condition and
possible fire and will be in violation of A.G.A. and C.G.A.
sertification of the unit.
DRIP TRAY
Figure 3
VENTING
The BOSCH instantaneous water heaters have builtin draft
diverters and are designed for indoor installation only. The
draft diverter outlet must be connected to a clear,
unobstructed vent of the same size, or lerger, refer to:
-
In Canada, CAN1-B149 Installation Code for detailed
requirements.
-
In U.S.A., ANSI Z223. 1 /NFPA 54 – National Fuel Gas
Code for detailed requirements.
The flue connection for both the W 325 K... and W 400
K... is 130 mm (5 inches); however, in Canada for
installations at high altitude (2,000-4,500 ft. above see level)
a six inch (6") flue is required for the W 400 K.
Figure 4
All manuals and user guides at all-guides.com
5" x 6" adaptor used
on high altitude model
W 400 only
For high altitude use the adaptor must be installed as shown
in figure 4, without alternation, before connecting the six
inch flue to the unit. The adaptor must be secured to the
draft diverter outlet with a minimum of two screws.
Also, in Canada, the gas pressure regulator supplied with
the water heater is factory preset to deliver gas to the water
at the proper pressure settting for high altitude operation,
see PRESSURE REGULATION section of this manual.
WARNING
Failure to increase vent size on W 400 to six inches and/or
to assure that manifold pressure is set to proper value listed
on rating plate for applications at altitudes in range 2,000
to 4,500 ft. above sea level will cause unsafe venting,
asphyxiation, and voids C.G.A. certification.
WATER CONNECTIONS
The W series instantaneous water heatrs are provided with
two S-bend water connectors/adaptors that must be
connected to inlet and oulet and outlet connections on water
valve assembly, see figure 1 and figure 5 below.
Water valve and S-bends, top view
Figure 5
The purpose of the S-bend water connectors/adaptors is to
provide threaded water connections that meet standards
used in North America, ANSI Standard Taper Pipe Thread
(1/2" NPT). The cold water supply should be connected to
S-bend attached to inlet of water valve and hot water
connection should be made to S-bend attached to outlet of
water valve.
Note: A shut-off valve should be placed in the cold water
supply line to the heater to facilitate servicing the
heater.
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