Relief Valve; Gas Connection; Pressure Regulator - Bosch WR 400-3.K Série Mode D'emploi

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 te relief valve and the
heater. A drain 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. The
discharge line must be installed so as to allow complete
drainage of both the valve and the line. See figure 6.
Pressure Pressure
Relief Relief
Valve Valve
Figure 6

GAS CONNECTION

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 WR400-3.K.. instantaneous gas water heaters are sup-
plied 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 gas pressure regulator as show in
figure 7 will be a violation of A.G.A and C.G.A certification
of the unit.
BOSCH water heaters are shipped from the factory with
the gas pressure regulators preset for the 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 altitude unit.
Figure 7
GAS MANIFOLD PRESSURE TEST POINT
T For measuring correct regulator operating pressure.
6
GAS INLET PIPE
PRESSURE TAP T

PRESSURE REGULATOR

Check to make sure that the gas listed on the rating plate is
same as gas listed on the pressure regulator. See
PRESSURE REGULATION section of this manual for
information regarding gas pressure settings.
Note: Before attaching the gas supply line, be sure that all
gas pipe is clean on the inside. To trap any dirt or
foreign material in the gas supply 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 accordance with the
recommendations of serving gas supplier.
Joint compounds (pipe dope) shall be applied sparingly and
only to the male threads of pipe joints. Do not apply com-
pound to the first two threads. The joint compound must be
resistant to the action of liquified petroleum gases.
Before placing water heater in operation check for gas leak-
age.
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.
WARNING
The heater and its individual shutoff valve must be
disconnected from the gas supply piping system during any
pressure testing of the gas supply piping system at test
pressures in excess of 3,45 KPa (½ psig).
The water heater must be isolated from the gas supply pip-
ing system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping system
at test pressures equal to or less than 3,45 KPa (½ psig).
The water heater, including the pressure regulator provided
with it, must not be operated at gas supply pressures in
excess of 3,45 KPa (½ psig).If overpressure has occurred
such as trough improper testing of the gas lines or emer-
gency malfunction of the supply system, the gas valve and
regulator must be checked for safe operation. Make sure
that the outside vent valves are protected against block-
age. These are part of the gas supply system, not the water
heater.
Vent blockage may occur during ice storms.
Figure 7 a)
Gas Burner
test point D for measuring pressure at full flow and input