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Operating Instructions - Bosch Pro Tankless GWH-450-ES Series Manual

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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Operating instructions

4
Operating instructions
Before proceeding with the operation of the water
heater make sure that the system is filled with water:
B Turn off power supply to water heater.
B Open the cold water inlet supply to the water heater
fully.
B Open a hot water faucet to permit the water to fill the
water heater and the piping and to eliminate the air
trapped in the system.
B Close the hot water faucet after the water flows freely
and all the air has escaped from the system. Turn on
power supply to heater. The water heater is now
ready to operate.
Fig. 25
4
On/Off switch
5
Reset button
6
ECO flow selector
7
LED - (ON) warning light (blinks when appliance in lock out)
8
Hot water temperature selector
10
LED to display error codes and temperatures
4.1
For your safety read before
operating your water heater
Warning: If you do not follow these
instructions exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
WHAT TO DO IF YOU SMELL GAS
B Do not try to operate any appliance.
B Do not touch any electric switch; do not use any
phone in your building.
B Immediately call your gas supplier from a neighbors
phone. Follow the gas supplier's instructions.
B If you cannot reach your gas supplier, call the fire
department.
20
B Use only your hand to press the on/off control switch.
Never use tools. Follow these instructions exactly. If
control switch is jammed, close the gas supply and
call a qualified service technician. Attempted forceful
repair may result in a fire or explosion.
B Do not use this appliance if any part has been under
water. Immediately call a qualified service technician
to inspect the appliance and to replace any part of
the control system and any gas control which has
been under water.
4.2
Startup instructions
B 1. STOP! Read the previous safety information.
B 2. The gas valve must be shut off by putting the ON/
OFF switch to position OFF. Wait five (5) minutes to
clear 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.
B 3. This appliance is equipped with electronic ignition
for lighting the main burners. When turning the water
heater on, follow these instructions exactly.
B 4. Press the ON/OFF switch to the ON position. In
this position, the water heater is ready to use.
B 5. Close the TT (thermostat) connection to activate
heater.
B 6. The burners will remain on until the heat demand
is met.
NOTE: upon installation or after
i
gas line work has been done, air
in the gas line may cause a
lockout error. Reset the unit
(Fig.
, pos. 52). The water heater
25
will reattempt ignition.
When the water heater is in operation you will hear its
power vent fan and burner operating. After a call for
heat, the power vent fan will continue to operate for up
to 60 seconds to exhaust all flue gases.
TO TURN OFF GAS TO APPLIANCE
B Turn off the manual gas shut off on the supply line to
the water heater and set the ON/OFF switch to the
OFF) position. Note: a manual gas shut off valve is
not supplied with the water heater.
6 720 607 915

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