INSTALLATION
Commissioning
Alternative cap fixing only for DHC 6 U
In the case of a limited clearance between the appliance and the
floor, use the hexagon screws supplied to secure the cap.
26�02�02�0256
3
2
1
DHC 6 U
1 Standard fixing screw
2 Hexagon screws
3 Knock-outs
Remove the standard screw.
Insert the hexagon screws.
Cleanly break or cut out the knock-outs in the appliance cap.
If necessary, use a file.
11. Commissioning
Warning Risk of electrocution
Commissioning may only be carried out by an authorised
contractor in accordance with safety regulations.
11.1 Commissioning
26�02�05�0087
Open and close all connected draw-off valves several times,
until all air has been vented from the pipework and the
appliance.
Carry out a tightness check.
Switch the mains power ON.
Where required, enter a flow rate, resulting in an outlet tem-
perature of around 35 - 40°C.
Check the function of the appliance.
Appliance handover
Explain the appliance function to users and familiarise them
with its operation.
Make the user aware of potential dangers, especially the risk
of scalding.
Hand over these instructions.
11.2 Recommissioning
!
Material damage
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.
Isolate the appliance from the power supply by re-
moving the fuse/tripping the MCB.
Open the tap for one minute until the appliance and
its upstream cold water inlet line are free of air.
Switch the mains power back ON again.
- See chapter "Commissioning"
12. Shutting down
Isolate all poles of the appliance from the power supply.
Drain the appliance (see chapter "Maintenance").
13. Troubleshooting
Problem Cause Remedy
The differential pressure
switch does not start the
heating element, even
though the DHW valve is
fully open.
The sieve in the differ-
ential pressure switch is
blocked.
Clean the sieve in the dif-
ferential pressure switch.
The flow rate is too low. Correct the flow rate; see
chapter "Maintenance".
No hot water flowing,
even though the differ-
ential pressure switch
can be heard switching
on.
The high limit safety
cut-out has switched the
appliance off for safety
reasons.
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".
The heating element
is scaled up; the high
limit safety cut-out has
switched off due to heat
build-up.
Replace the heater.
The heater is faulty. Replace the heater.
14. Maintenance
Warning Risk of electrocution
Before any work on the appliance, disconnect all poles
from the power supply.
Draining the appliance
You can drain the appliance for maintenance work or to protect
it from frost.
DANGER Scalding
Hot water may escape when draining the appliance.
Close the shut-off valve in the cold water supply line.
Open all draw-off valves.
Remove the power supply.
Undo the water connections on the appliance.
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