Functions
■ Weather-compensated control of the boiler water and/or flow tem-
perature
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump and burner stop (not for
burners on boilers with a low-end boiler water temperature limit)
■ Adjustment of a variable heating limit
■ Anti-seizing pump protection
■ Integral diagnostic system
■ Flue gas temperature monitoring with flue gas temperature sensor
■ Maintenance display
■ Adaptive cylinder temperature control unit with priority control (heat-
ing circuit pumps OFF)
■ Auxiliary function for DHW heating (short-term heating to a higher
temperature)
The requirements of DIN EN 12831 for heat load calculation are met.
To reduce the heat-up load, the reduced room temperature will be
raised in case of low outside temperatures. The flow temperature will
be raised for a limited time to reduce the heat-up time after a setback
period.
According to the Energy Savings Order [Germany], the temperature in
each room must be individually controlled, e.g. through thermostatic
radiator valves.
Control characteristics
■ Boiler control unit:
P-characteristics with two-point output when using a burner with
multiple stages
■ Heating circuit control unit:
PI characteristics with three-point output
■ Thermostat for limiting the max. boiler water temperature:
75 °C, adjustable to 87 °C
■ Adjusting the high limit safety cut-out:
110 °C, adjustable to 100 °C
■ Heating curve setting range:
– Slope: 0.2 to 3.5
– Level: -13 to 40 K
– Max. limit: 20 to 130 °C
– Min. limit: 1 to 127 °C
■ Range of the set DHW temperature
10 to 60 °C, may be changed to 10 - 95 °C
Boiler coding card
For matching to the boiler (supplied with the boiler).
Time switch
Digital time switch
■ Day and week program, annual calendar
■ Automatic summer/winter time changeover
■ Automatic function for DHW heating and DHW circulation pump
■ Time, day and standard switching times for central heating, DHW
heating and the DHW circulation pump are factory-set
■ Switching times are individually programmable, i.e. up to four switch-
ing periods per day
Shortest switching interval: 10 minutes
Power backup: 5 years
Setting heating programs
The heating system frost protection (see frost protection function)
applies to all heating programs.
You can select the following operating programs with the program
keys:
■ Heating and DHW
■ Only DHW
■ Standby mode
External heating program changeover via control module V.
Summer mode
("DHW only")
The burner starts only when the DHW cylinder needs reheating (con-
trolled by the cylinder thermostat).
The respective low-end boiler water temperature of each boiler is
maintained if necessary.
Frost protection
■ The frost protection function starts when the outside temperature
drops below approx. +1 °C.
With active frost protection, the heating circuit pumps are switched
ON and the boiler water is maintained at the set value for reduced
mode, i.e. at a low-end temperature of approximately. 20 °C. The
allocated temperature is maintained for boilers with a low-end tem-
perature limit.
■ The frost protection function stops when the outside temperature
rises above approx. +3 °C, i.e. the heating circuit pump and burner
will be switched off.
Adjusting the heating curves (slope and level)
The Vitotronic 200 regulates the boiler water temperature in weather-
compensated mode (= flow temperature of the heating circuit without
mixer). The boiler water temperature is automatically boosted by
between 0 and 40 K higher than the currently required set flow tem-
perature (delivered condition 8 K).
The flow temperature required to reach a specific room temperature
depends on the heating system and the thermal insulation of the build-
ing to be heated.
Adjusting both heating curves matches the boiler water temperature
and the flow temperature to these operating conditions.
The upper boiler water temperature is limited by the thermostat and
the electronic maximum temperature limiter.
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