Water Connections - Bosch WR400-1K Series Installation Operation & Maintenance

DRIP TRAY
If the water heater is being mounted above a floor of
combustible construction the drip tray ( shipped loose in
the carton with the water heater) must be attached to the
bottom of the front cover of the water heater at the 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
certification of the unit.
Figure 3
VENTING
The BOSCH instantaneous water heaters have built-in draft
diverters and are designed for indoor installation only. The
draft diverter outlet must be connected to a clear,
unobstracted vent of the same size, or larger, refer to:
•
In Canada, CAN/CGA- B149 Installation Codes for
detailed requirements.
•
In U.S.A., ANSI Z223. 1 /NFPA 54, National Fuel Gas
Code for detailed requirements.
The flue connection for the WR400-1 is 130 mm (5 inches);
however, in Canada for installations at high altitude (2,000-
4,500 ft. above sea level) a six inch (6") flue is required.
Figure 4
DRIP TRAY
5" x 6" adaptor used
on high altitude model
WR 400 only
For high altitude use the adaptor must be installed as shown
in Figure 4, without alteration, 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
heater at the proper pressure setting for high altitude
operation, see PRESSURE REGULATION section of this
manual.
WARNING!
Failure to increase the vent size of the WR400-1 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 of 2,000 to 4,500 ft. above sea level will cause unsafe
venting, asphyxiation, and voids C.G.A. Certification.

WATER CONNECTIONS

The BOSCH instantaneous water heaters are provided with
two S- bend water connectors/adaptors that must be
connected to inlet 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 the hot water
connection should be made to S- bend attached to the outlet
of water valve.
If plastic piping is to be used, a 1.5 meter (approx. 5 feet)
length of metal piping must be attached to both the cold
water inlet and hot water outleet of the water heater.
Note: A shut-off valve should be placed in the cold water
supply line to the heater to facilitate servicing the
heater.
5