&
Demand-dependent heati ng circuit pump and burner OFF con-
trol
&
Adjustment of a variable heating limit
&
Anti-seizing pump protection
&
Heating system frost protection
&
Integral diagnostics system
&
Maintenance di splay
&
Integral DHW heating
&
Screed drying program
&
External starting and blocking (accessories)
The requirements of DIN EN 12831 for heating load calculation
are met. To reduce the heat-up load, the night setback is reduced
in case of low outside temperatures. The flow temperature will be
raised for a limite d time to reduce the heat-up time after a setback
period.
According t o the Energy S avings Order [Germany], the tempera-
ture in each room must be individually controlled, e.g. through
thermostatic radiator valves.
Control characteristic s
PI characteristics with modulating output.
Time switch
Digital time switch
&
Day and week program, annual cal endar
&
Automatic s ummer/winter ti me chang eover
&
Automatic f unction for DHW heating and DHW circulation pump
&
Time, day and standard s witching times for central heati ng,
DHW heating and the DHW circulation pump are factory-set
&
Switching times are individually programmable, i.e. up to four
switching periods per d ay.
Shortest swi tching interval: 10 minutes
Power backup: 5 years
Setting the heating programs
The heatin g system frost protection (see frost protection function)
applies to all heating programs.
You can select the following heating programs with the program
keys:
&
Heating and DHW
&
DHW only
&
Standby mode
External heating program changeover in conjunction with an
external extension H1 or H2.
Frost p rotection function
&
The fro st protection function will be started when the outside
temperature drops below approx. +1 °C.
With active frost protection, the heating ci rcuit pump will be
switched ON and the boiler water is maintained at a lower tem-
perature of approx. 40 °C.
&
The fro st protection function will be switched OFF when the out-
side temperature rises above approx. +3 °C.
Summer mode
Heating prog ram "w"
The burne r starts only when the DHW cylinder needs to be heated
up again.
Adjusting the heating curves (slope and level)
The Vitotronic 200 controls the boiler water temperature (= fl ow
temperature of the heating circuit without mixer) and the flow tem-
perature of the heating circuit with mixer (in conjunction with the
extension kit for one heating circuit with mixer) subj ect t o outsi de
temperature. The boiler water temperature is automaticall y
boosted by between 0 and 40 K higher than the currently required
set flow temperature (delivered condi tion 8 K).
The flow temperature required to reach a specific room tempera-
ture depends on the heating system and the thermal insulation of
the building to be heated.
Adjusting both heating curves matches the boiler water tempera-
ture and the flow temperature to these operati ng conditions.
Heating curves:
The upper boiler water temperature is limited by the temperature
limiter and the temperature set at the electronic maximum thermo-
stat.
The flow temperature cannot exceed the boi ler water temperature.
Heating systems with low loss header
When using a hydraul ic separation (low loss header), connect a
temperature sensor for use in the low loss header.
Boiler water temperature sensor
The boiler water temperature sensor is connected to the control
unit and built into the boiler.
Specification
Permissible ambient temperature
– during operation 0 to +130 °C
– during storage and transport -20 to +70 °C
Cylinder temperature sensor
The cylinder temperature sensor is integrated i nto the boiler.
Specification
Protection IP 32
Permissible ambient temperature
– during operation 0 to +90 °C
– during storage and transport -20 to +70 °C
Outlet temperature sensor
The outlet temperature sensor is integrated into the boil er.
Specification
Protection IP 32
Permissible ambient temperature
– during operation 0 to +90 °C
– during storage and transport -20 to +70 °C
Outside temperature sensor
Installation location:
&
North or north-western wall of the buildi ng
&
2 to 2.5 m above the ground, for multi-storey buildings in the
upper half of the second floor
Connection:
&
2-core lead, length up to 35 m with a cross-section of 1.5 mm
2
(copper)
&
Never route this lead immediately next to 230/400 V cables
5822 335-1 GB
VITOPEND 222 VIESMANN 19
Vitotronic 200, type HO1 (weather-compensated mode) (cont.)
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