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.
11.5 Vitotronic 300, type GW2, part no. 7248 085
Specification
Construction
The control unit comprises a standard unit, electronic modules and a
programming unit.
Standard unit:
■ ON/OFF switch
■ TEST key
■ Emissions test switch
■ Optolink laptop interface
■ Temperature controller
DIN TR 77708
or
DIN TR 96808
■ High limit safety cut-out
DIN STB 116907
or
DIN STB 98108
■ Operation and fault displays
■ Plug connection chamber
– Connection of external equipment via a system plug
– 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
■ All adjustments and the most important codes as plain text
■ Rotary selector for the temperature in standard mode
■ Keys:
– Temperature for reduced mode
– Program selection
– Holiday program
– Party and economy mode
– DHW temperature
– Heating curve for boiler water temperature (= system flow tem-
perature) and flow temperature
– Heating circuit selection
– Time/Date
Functions
■ Weather-compensated regulation of the boiler water temperature
(= system flow temperature) and/or flow temperature
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump and burner stop (not for
burners on boilers with a low-end boiler water temperature limit)
■ Adjustment of a variable heating limit
■ Anti-seizing pump protection
■ Integral diagnostic system
■ Flue gas temperature monitoring with flue gas temperature sensor
■ Maintenance display
■ 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)
■ Optional connection of external fault messaging
■ With boiler protection function subject to boiler version:
– Therm-Control start-up system
– Shunt pump control
– 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
■ Boiler control unit
P-characteristics with two-point output when using a multi-stage
burner, if installed
Pl characteristics with three-point output when using a modulating
burner, if installed
■ Heating circuit control unit
PI characteristics with three-point output
■ Thermostat for limiting the max. boiler water temperature:
95°C, adjustable to 100°C
■ Adjusting the high limit safety cut-out:
110 °C, adjustable to 100°C
■ Heating curve setting range:
– Slope: 0.2 to 3.5
–
Level: −13 to 40 K
– Max. limit: 20 to 127°C
– Min. limit: 1 to 127°C
■ Range of the set DHW temperature:
10 to 60°C; can be changed to 10 to 95°C
Boiler coding card
For matching to the boiler (supplied with the boiler).
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
Control units
(cont.)
58
VIESMANN
OIL/GAS BOILERS
11
5822 426 GB
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