12
The total hardness of the feed and top-up water must
not exceed 0.11 °dH (total value of alkaline earths
≤ 0.02 mol/m
3
).
The pH value should be between 9 and 10.5.
Cleaning the sight glass in the boiler door
Fig. 6
Check the gaskets and hose connection for tightness.
Checking the mixer for ease of operation and tightness
1. Remove the motorised lever from the mixer handle.
2. Check the mixer for ease of operation.
3. Check the mixer for tightness. Replace the O-ring
gaskets if the mixer is leaking.
4. Snap the motorised lever into place.
Checking the function of the return temperature raising facility (if
installed)
Checking the installation room ventilation
Checking the flue pipe for tightness
Checking the Vitoair draught stabiliser (if installed)
Release the latch on the control disc. The control disc must swing freely during burner oper-
ation.
Adjusting the burner
Burner service instructions or separate docu-
mentation by the burner manufacturer
Adjust the maximum oil or gas throughput of the
burner to the rated boiler heating output.
Commissioning, inspection, maintenance
Checking the water quality (cont.)
5692 701 GB
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