Delivered condition
■ Programming unit
■ Outside temperature sensor
■ Boiler water temperature sensor
■ Cylinder temperature sensor
■ Bag with technical documentation
Heating system with DHW cylinder
Order separately:
■ Circulation pump with check valve for regulating the cylinder tem-
perature
or
■ Vitotrans 222 primary store system with mixer assembly
Communication
The LON communication module (accessories) is required for com-
munication with other control units.
11.6 Vitotronic 300-K, type MW1, part no. 7248 233
Specification
Construction
The control unit comprises a standard unit, electronic modules and a
programming unit.
Standard unit:
■ ON/OFF switch
■ Emissions test switch
■ Optolink laptop interface
■ Operation and fault displays
■ Plug connection chamber
– Connection of external equipment via a system plug
– Plug the connectors directly into the front of the open control unit
– Connection of three-phase consumers via additional contactors
Programming unit:
■ With digital time switch
■ Backlit display with plain text support
■ Adjustment and display of temperatures and codes
■ Fault message display
■ Rotary selector for the temperature in standard mode
■ Keys:
– Temperature for reduced mode
– Program selection
– Holiday program
– Party and economy mode
– DHW temperature
– Heating curves for the system flow temperature and the flow tem-
perature of the heating circuits with mixer
– Heating circuit selection
– Time/Date
Functions
■ Weather-compensated control of the system flow temperature of a
multi-boiler system with up to four boilers with the Vitotronic 100,
type GC1, (modulating) and the flow temperature of the heating cir-
cuits with mixer
■ Control of the Vitotronic 100, type GC1, to effect the control of the
boiler in accordance with a boiler sequence strategy (freely selected)
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump shutdown
■ Adjustment of a variable heating limit
■ Anti-seizing pump protection
■ Central fault message
■ Integral diagnostic system
■ Adaptive cylinder thermostat with priority (heating circuit pump OFF,
mixer closed)
■ Auxiliary function for DHW heating (short-term heating to a higher
temperature)
■ Control of a primary store system with mixer assembly (only availa-
ble as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ Screed drying, for underfloor heating systems
■ With boiler protection functions subject to system version:
– Distribution pump control
or
– Shunt pump control
or
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a primary store system with mixer assembly)
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
■ PI characteristics with three-point output
■ Setting range for heating curves:
– Slope: 0.2 to 3.5
– Level: -13 to 40 K
– Max. limit: 20 to 130 °C
– Min. limit: 1 to 127 °C
– Differential temperature for a heating circuit with mixer: 0 to 40 K
■ Set DHW temperature range:
10 to 60 °C; can be changed to 10 to 95 °C
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:
Control units
(cont.)
60
VIESMANN
OIL/GAS BOILERS
11
5822 426 GB
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