Additional Maintenance Information; Danger Of Freezing; Long Periods Of Shut-Down; Water Quality - Viessmann Vitocrossal 300 CT3 Series Operating Instructions And User's Information Manual

Inspection and Maintenance

Additional Maintenance Information

Long Periods of Shut-down

Water Quality

12
Vitocrossal 300 CT3 Series Operating

Danger of freezing

If the system is subject to freezing temperatures and
is not filled with antifreeze for protection, the system
including the boiler must be drained of water.
The valve before automatic feed valve (if installed) must
be closed. All other valves, air vents and drain valves
must remain open.
In case the heating boiler is shut down for an extended
period of time, i.e. after the heating season, the
combustion chamber, the flue gas collector and the vent
pipe should be properly cleaned to avoid corrosion.
The heating system can stay filled and under pressure.
The remaining condensate should be removed from the
flue gas collector by means of the front inspection service
opening.
The lifetime of the entire heating system is influenced by
the water quality. A water treatment system will protect
against damages caused by corrosion and lime formation.
Hard water conditions (i.e. calcium carbonate) must be
avoided as it will cause deposits to accumulate on the
heat exchanger surfaces.
If in any doubt about the water quality, please have a
proper water analysis done. Check with regional chemical
suppliers for boiler water treatment or with Viessmann
Manufacturing Company Inc. directly.