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10.3 Completing the installation
» Open the shut-off valve in the twin connector or the
cold water inlet line.
11. Commissioning
WARNING Electrocution
Commissioning may only be carried out by a qual-
ified contractor in accordance with safety regula-
tions.
11.1 Initial start-up
» Open and close all connected draw-off valves sever-
al times, until all air has been vented from the pipe-
work and the appliance.
» Carry out a tightness check.
» Activate the safety pressure limiter by firmly pressing
the reset button (the appliance is delivered with the
safety pressure limiter deactivated).
» Fit the appliance cover, ensuring it clicks into place.
Check that the appliance cover is seated correctly.
» Switch the mains power ON.
» Check the function of the appliance.
Appliance handover
» Explain the appliance function to users and familiar-
ise them with its operation.
» Make users aware of potential dangers, especially
the risk of scalding.
» Hand over these instructions.
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11.2 Recommissioning
Vent the appliance and the cold water inlet line (see chap-
ter "Settings").
See chapter "Commissioning / Initial start-up".
12. Shutting down the system
» Isolate all poles of the appliance from the power
supply.
» Drain the appliance (see chapter "Maintenance").
13. Troubleshooting
Fault
Cause
The flow rate is too
The strainer in the ap-
low.
pliance is dirty.
Flow meter will not
The start-up volume
start despite tap being
required to start up
fully opened.
the heating output has
not been reached.
The appliance is not
Safety pressure limiter
generating hot water
(AP 3) has switched
despite audible sound
the appliance off for
of the differential pres-
safety reasons.
sure switch starting.
The heating system is
faulty.
Remedy
Clean the strainer.
Clean the strainer.
Remove the cause of
the fault (e.g. faulty
pressure washer).
Protect the heating
system against over-
heating by opening a
draw-off valve down-
stream of the appli-
ance for one minute.
This depressurises
and cools down the
heating system.
Activate the safety
pressure limiter at flow
pressure by pressing
the reset button (see
chapter "Commission-
ing").
Check the heating
system resistor, and
replace it if required.
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