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Boiler Control
Design and Function
Functions
Weather-compensated control of the boiler water
■
and/or supply 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
■
DHW heating 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)
External starting and blocking (in conjunction with
■
extension EA1)
To reduce the heat-up output, the reduced room
temperature will be raised in case of low outside
temperatures. The supply temperature will be raised for
a limited time to reduce the heat-up time after a setback
phase.
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
■
recirculation pump
Time, day and standard switching times for central
■
heating, DHW heating and the DHW recirculation
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
26
Vitodens 200-W B2HA 88-150, 311- 530 Technical Data
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:
Zone circuits
■
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).
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