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RELIEF VALVE
The listed pressure relief valve supplied must be installed
near the hot water outlet at time of installation of the heater.
No valve is to be placed between the relief valve and the
heater. A line must be connected to the relief valve to direct
discharge to a safe location. Do not install reducing coupling
or any other restriction in the discharge line must be installed
so as to allow complete drainage of the valve and the line.
See figure 6.
Figure 6
GAS CONNECTIONS
Before connecting the gas supply to the heater check
heater's model/rating plate to make sure that gas on which
heater is to operate is the same as specified on the model/
rating plate.
The W 400 K and the W 325 K instantaneous gas water
heaters are supplied with a gas pressure regulator that must
be installed on the heater before attaching the gas supply
line, see figure 7. Failure to install the pressure regulator, or
the failure to install it in the sequence shown in figure 7 will
be of A.G.A. and C.G.A. certification of the unit.
PRESSURE TAP
PRESSURE REGULATOR
MANUAL GAS VALVE
Figure 7
6
All manuals and user guides at all-guides.com
BOSCH water heaters are shipped from the factory with
the gas pressure regulators preset for tte gas shown on the
rating plate to the correct pressure:
-
in Canada, for high altitude operation;
-
in U.S., for standard altitude operation unless specially
marked as a high altiude unit.
Check to make sure that the gas listed on the rating plate is
same as gas listed on the pressure regulator.
See PR ESSU R E REGU LATION of this manual for
information regarding gas pressure settings.
Note: Before attaching the gas supply line, be sure that all
Joint compounds (pipe dope) shall be applied sparingly and
only to the male threads of pipe joints. Do not apply
compound to the first two threads. The joint compound used
must be resistant to the action of liquified petroleum gases.
Before placing water heater in operation check for gas
leakage. Soap and water solution, or other material
acceptable for this purpose, shall be used in locating gas
leaks. Matches, candles, lighters, or other ignition sources
shall not be used for this purpose.
The heater and its individual shutoff valve must be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressure in excess of
3,45 kPa (1/2 psig).
The water heater must be isolated from the gas supply piping
system by closing its individual manuaql shutoff valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than 3.45 kPa (1/2 psig).
The water heater, including the pressure regulator and
manual valve provided with it, must not be operated at gas
supply pressures in excess of 3.45 kPa (1/2 psig). If
overpressure has occurred such as through improper testing
of the gas lines or emergency malfunction of the supply, the
gas valve and regulator must be checked for safe operation.
Make sure that the outside vent valves are protected against
blockage. These are part of the gas supply system, not the
water heater.Vent blockage may occur during ice storms.
gas pipe is clean on the inside. To trap any dirt or
foreign material in the gas suplly line, a drip leg must
be incorporated in the piping. The drip leg must be
readily accessible and not subject to freezing
conditions.
Install
in
recommendations of serving gas supplier.
WARNING
accordance
with
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