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iNSTALLATiON
Commissioning
11. Commissioning
Warning Electrocution
Commissioning must only be carried out by a qualified
contractor in accordance with safety regulations.
11.1 Initial start-up
f Open and close all connected draw-off valves several times,
f
until all air has been purged from the pipework and the
appliance.
f Carry out a tightness check.
f
f Switch the mains power ON.
f
f Where required, set a flow rate that will result in an outlet
f
temperature of around 35 - 40 °C; see chapter „Installation /
Maintenance / Setting the flow rate".
f Check the function of the appliance.
f
Appliance handover
f Explain the appliance function to users and familiarise them
f
with its operation.
f Make the user aware of potential dangers, especially the risk
f
of scalding.
f Hand over these instructions.
f
11.2 Recommissioning
Material losses
!
After an interruption in the water supply, recommission
the appliance by carrying out the following steps in order
to prevent irreparable damage to the heating system.
f Isolate the appliance from the power supply by re-
f
moving the fuse/tripping the MCB.
f Open the tap for one minute until the appliance and
f
its upstream cold water inlet line are free of air.
f Switch the mains power back ON again.
f
- See chapter „Commissioning"
12. Shutdown
f Isolate all poles of the appliance from the power supply.
f
f Drain the appliance (see chapter „Maintenance").
f
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| DHA 4-8 L
13. Troubleshooting
problem
Cause
The differential pressure
The strainer in the differ-
switch does not start the
ential pressure switch is
heating element, even
blocked.
though the DHW valve is
fully open.
The flow rate is too low. Correct the flow rate; see
No hot water flow, even
The high limit safety
though the differential
cut-out has switched the
pressure switch can be
appliance off for safety
heard switching on.
reasons.
The heating element
is scaled up; the high
limit safety cut-out has
switched off due to heat
build-up.
The heating system is
faulty.
remedy
Clean the strainer in the
differential pressure
switch.
chapter "Maintenance".
Remedy the cause of
the fault. Isolate the ap-
pliance from the power
supply and depressurise
the water line. Press the
high limit safety cut-out
reset button; see chapter
"Maintenance".
Replace the heater.
Replace the heater.
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