Checking The Water Quality; Checking The Neutralising System According To The Manufacturer's Instructions; Cleaning The Sight Glass In The Boiler Door; Checking The Mixer For Ease Of Operation And Tightness - Viessmann Vitoradial 300-T Service Instructions Manual

Checking the water quality

Observe the instructions in chapter "Water quality
requirements" on page 23.
The pH value should be between 8.2 and 9.5.
Checking the neutralising system according to the manufacturer's
instructions; replacing used agent

Cleaning the sight glass in the boiler door

Fig. 10
Check the gaskets and hose connection for leaks.

Checking the mixer for ease of operation and tightness

1. Remove the motorised lever from the mixer han-
dle.
2. Check the mixer for ease of operation.

Return temperature raising facility

Do not use a return temperature raising facility
(RTRF). An RTRF will inhibit the condensation proc-
ess.

Checking the installation room ventilation

Checking the flue pipe and all connections from the heat exchanger to the
flue system for tightness
Check the connection between the boiler and the heat
exchanger for tightness.
Commissioning, inspection, maintenance
Enter the amount of top-up water and the total hard-
ness of the feed and boiler water into the table in the
appendix on page 25.
3. Check the mixer for leaks. Replace the O-rings if
the mixer leaks.
4. Snap the motorised lever into place.
To protect the boiler, use the Therm-Control function
on the control unit.
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