Technical data

5683 718 - 04
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Boiler Control
Design and Function
Functions
■ Weather-compensated control of the boiler water
and/or flow temperature
■ Control of one heating circuit without mixer and two
heating circuits with mixer
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump and burner
off control
■ Adjustment of a variable heating limit
■ Anti-seizing pump protection
■ Heating system frost protection
■ Integral diagnostic system
■ Maintenance display
■ Cylinder thermostat with priority
■ Control of solar DHW heating and central heating
backup in conjunction with the solar control module,
type SM1
■ Display of the solar energy yield
■ Auxiliary function for DHW heating (short-term
heating to a higher temperature)
■ Slab curing program
■ External starting and blocking (in conjunction with
extension EA1)
The requirements of DIN EN 12831 for calculating the
heat load are met. To reduce the heat-up output, 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 phase.
According to the Energy Saving Ordinance [Germany], the
temperature in each room must be individually controlled,
e.g. through thermostatic radiator valves.
Control characteristics
PI characteristics with modulating output.
Time switch
Digital time switch (integrated into the programming unit)
■ Individual day and seven-day program
■ Automatic summer/wintertime 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 switching periods per day
Shortest switching interval: 10 minutes
Power reserve: 14 days
Setting the operating programs
The heating system frost protection (see frost protection
function) applies to all heating programs.
The following heating programs can be selected:
■ Heating and DHW
■ Only DHW
■ Standby mode
External heating program changeover in conjunction
with EA1 extension.
Frost protection function
■ The frost protection function will be started when the
outside temperature drops below approx. 34° F (1° C).
With the frost protection function, the heating circuit
pump will be switched ON and the boiler water is
maintained at a lower temperature of approximately
68° F (20° C). The DHW tank will be heated to
approximately 68° F (20° C).
■ The frost protection function will be stopped when
the outside temperature rises above approximately
37° F (3° C) (default settings).
Summer Operation
Heating program “w”
The burner is only activated upon a call for domestic hot
water from the DHW storage tank (controlled by DHW
tank temperature sensor).
Vitodens 200-W B2HA 100 to 150 Technical Data