To Turn Off Gas To Appliance; Service Hint; Operating Instructions - Bosch WR 400-7.K Series Installation & Operation Manual

OPERATING INSTRUCTIONS

WARNING!
If the water heater has been damaged or exposed to fire or
sooting, or if any part has been underwater, do not use.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and
any gas control which as been underwater and to clean the
heater exchanger assembly and water valve.
FILLING
Before proceeding with operation of the water heater make
sure that the system is filled with water:
- Make sure drain is closed. See figure 8, below.
- Open a nearby hot water faucet to permit the water to
fill the heater and piping.
- Close the hot water faucet after the water flows freely
and all air has escaped from the system.
The water heater is now ready to be lit.
WATER VALVE
FROM HEAT
EXCHANGER
Figure 8

SERVICE HINT

The screen (strainer) in the water valve, located in the inlet
of the water valve, may require occasional cleaning due to
foreign material in the water supply. This will restrict the flow
of water and may affect heater operation and prolong filling
time. To inspect the strainer, close the cold water supply
valve ahead of the heater, disconnect the S-bend from the
inlet of the water valve and remove strainer from inlet.
Clean if required, replace strainer in inlet to the water valve,
reconnected S- bend and turn on water supply.
Light the water heater in accordance with the instructions
on the Lighting and Operating Plate on the water heater.
For your convenience, the instructions are repeated here:
6 720 606 560
TO HEAT EX-
CHANGER
DRAIN PLUG
LIGHTING AND OPERATING INSTRUCTIONS
1. STOP! Read the safety information above on this label.
2. The gas valve must be shut off by putting the ON/OFF
switch to position "
out any gas. If you smell gas, STOP! Follow "B" in the
safety information above. If you do not smell gas, go to
the next step.
3. This water heater is equipped with a safety pilot burner
and an automatic ignition control system.
4. Set the ON/OFF switch to the "
position, the water heater is ready to use. (See Figure
9).
5. Turn the hot water faucet on the minimum flow rate
required to activate the heater. The automatic ignition
system first ignites the safety pilot burner which then
ignites the main burner in about 4 seconds. Green LED
indicator is on when main burner is on.
6. If the red LED indicator light is flashing, this is a warning
that water pressure isn't enough to ignite the main burner.
7. The pilot flame will extiguish 10-30 seconds after the
burners come on. The burners will remain on until the
hot water tap is turned off.
NOTE: On a first time the initial installation, existence of air
in the gas supply line and in the water line may cause some
ignition delay. In that case, repeatedly open and close the
hot water tap in order to restart the ignition process until all
the air has been purged.

TO TURN OFF GAS TO APPLIANCE

Turn off the manual lever on the gas supply line to the heater
and set the ON/OFF switch to the OFF (
To start and to shut down
the appliance press the
button " ".
The switch is located
behind t he flip down
cover plate on the front
panel strip.
- on
- off
Green light on =
main burner on.
Green light off =
main burner off.
If the red light is flashing,
that means the water flow
is not enough to ignite the
burner.
Figure 9
". Wait five (5) minutes to clear
" position. In this
) position.
7