Design And Function - Viessmann VITODENS 200-W Technical Data Manual

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
Control of one heating circuit without mixer and two
■
heating circuits with mixer
■ Demand-dependent heating circuit pump and burner
off control
Adjustment of a variable heating limit
■
Anti-seizing pump protection
■
Integral diagnostic system
■
Maintenance display
■
DHW temperature control 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)
Screed drying program
■
0-10V External signal input
■
Control Characteristics
PI characteristics with modulating output.
Time Switch
Digital time switch.
Individual and 7-day program
■
Automatic daylight savings time changeover
■
Automatic function for DHW heating and DHW
■
recirculation pump
Time, day and standard switching times for space
■
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 backup: 14 days.
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Vitodens 200-W, B2HA 19 to 80 Technical Data
Setting the Operating Programs
The heating 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.
Frost protection
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 approx. 68° F
(20° C).
The DHW tank will be heated to approx. 68° F (20° C).
The frost protection function will be stopped when the
■
outside temperature rises above approx. 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).