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INSTALLATIoN
Initial start-up
7.
Initial start-up
f Check the safety valve (see chapter "Maintenance").
f Check the non-return valve (see chapter "Maintenance").
Adjusting the flow rate
f Set the flow rate at the shut-off valve of the safety assembly.
8.
Troubleshooting
Problem
Cause
During heating, no water
The non-return valve is
drips from the safety
faulty.
valve.
After heat-up has ended,
The safety valve is con-
water drips from the
taminated.
safety valve.
9.
Maintenance
9.1
Safety valve
Note
The safety valve cannot be repaired.
f In the case of faulty operation, replace the complete
safety valve.
9.1.1 Checking the safety valve
f For safety reasons, check the safety valve twice a year.
f Remove the cap. Turn the bleed cap 2 to 3 times anti-clock-
wise. Water should then drain into the tundish.
f Draw off hot water until the heater of the DHW cylinder
switches on.
During the heat-up process, expansion water will drip from the
safety valve into the tundish.
f Check the function of the non-return valve if no water drips
during heat-up.
No water must drip out after heat-up has been completed.
f Should water nevertheless drip after heat-up, clean the safe-
ty valve and check the water inlet pressure.
f If necessary, install a pressure reducing valve.
9.1.2 Removing / cleaning the safety valve
f Isolate the DHW cylinder from the power supply.
f Remove the cap from the shut-off valve. Turn the shut-off
valve clockwise to shut off the cold water inlet.
f Drain the DHW cylinder.
f Undo the safety valve.
f Clean the seat and gasket of the safety valve.
f Refit the safety valve.
f Check the safety valve.
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9.2
9.2.1 Checking the non-return valve
f Check the non-return valve annually.
f Draw off hot water until the heater of the DHW cylinder
Remedy
Check the function of the
non-return valve. If nec-
essary, replace the safety
assembly.
Clean or replace the safe-
ty valve.
1 Shut-off valve
2 Pressure gauge screw
f Remove the cap from the shut-off valve.
f Turn the shut-off valve clockwise to shut off the cold water
f Remove the pressure gauge screw.
No water must drip from the shut-off valve.
f If water drips out, the non-return valve is not leaktight. Re-
f If cold water drips, turn the shut-off valve anti-clockwise
9.3
The shut-off valve is maintenance-free.
f If the shut-off valve proves to be faulty, replace the safety
Non-return valve
switches on.
inlet.
place the safety assembly.
briefly to open it and flush out any dirt. Then close the shut-
off valve again. If water continues to escape, replace the
safety assembly.
Shut-off valve
assembly.
1
2
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