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calibrated equipment.
At the time of commissioning, complete all revelant sections of the Benchmark Checklist located on
the inside back pages of the document.
For maintenance of the boiler the cover has to be removed.
Unscrew the 2 locking screws from the fasteners at the top of the boiler, unlock the fasteners and remove the
cover in a forward motion. See gure 16.a
Changing settings, such as the burner pressure and the amount of air ow, is superuous. Only in case of a
failure or when replacing the gas block, venturi and/or fan, the CO
2
percentage should be checked.
Always check all gas carrying parts for leaks (with a leak detection spray) after (maintenance) work
to the boiler.
Close the relevant commissioning valves during the maintenance activities. See gure 15.a.
Draining the boiler
- Shut down the CH and DHW program and disconnect the 230V power supply
- Close the isolation valve CH ow (1) & CH return (2)
- Unscrew the cap nut from the return pipe lling loop connection (3)
- Connect a hose and drain socket (4) to the return lling loop connection (3) and lead the other end of the
hose to the drain.
- Slowly open the valve (2A) of the lling loop on the return pipe completely. CH water will only be drain out
from the boiler.
- If the CH water from the system and boiler needs to be drained, open the CV isolation valve (2)
Reassembly takes place in reverse order.
OPEN CLOSED
CH FLOW CH RETURNGAS DHW COLD
Figure 15.a
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