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Vitocrossal 200, CM2-400, -500, -620 and 620 TX Operating
Service Schedule
Frequency
Performed by
Annually
Heating
Contractor
Periodically Heating
Contractor
IMPORTANT
Keep boiler and boiler room clear and free from combustible
materials, gasoline and other flammable vapors and liquids.
Do not obstruct the flow of combustion and ventilation air.
All inspection, maintenance, and service must be performed
by a qualified heating contractor.
Additional Maintenance Information
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.
Long periods of shut-down
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.
(continued)
Service
When circulating pump is field-installed or existing, check requirements for
maintenance or lubrication according to manufacturer's specifications.
Check for gas-tight connection of gas piping, unions, gas valve and manifold.
Check proper ignition and gas burner operation.
Combustion test must be performed by a qualified heating contractor.
Ensure functionality of low water cut-offs, during operation, based on supplier's
instructions.
Inspect low- and/or high-pressure gas switch (if used).
Inspect main burner flame and follow burner manufacturer's instruction manual
for detailed service and maintenance guidelines. Manual is shipped with burner.
All boilers and the boiler room must be kept free of high dust levels, high humidity,
aggressive vapor and/or chemicals containing chlorine.
Ensure proper boiler room ventilation.
Check and repair valves, fittings and pipes.
Combustion chamber door and flanges may need to be retightened and resealed.
IMPORTANT
The boiler should be cleaned at least once a year by a
qualified heating contractor or service agency.
Water quality
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.
Service and Maintenance
11
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