Viessmann VITOCROSSAL 200 Type CM2 Technical Manual page 56

Control units
(cont.)
■ Operating and fault display
■ Plug connection chamber:
– Connection of external equipment via system plug
– Connection of three-phase consumers via additional contactors
Programming unit
■ High contrast display with large fonts for easy operation.
■ User prompts with pictographs.
■ Operating keys:
– Navigation
– Confirmation
– Settings/menu
9
■ Settings:
– Boiler water temperature
– Codes
– Actuator tests
– Test mode
Only in conjunction with single boiler systems:
– DHW temperature
– Operating program
■ Indicators:
– Boiler water temperature
– DHW temperature (only in single boiler systems)
– Operating data
– Diagnostic details
– Maintenance and fault messages
Functions
■ Control of the boiler water temperature (= system flow temperature)
to the specified value.
■ Electronic maximum boiler water temperature limit.
■ Pump anti-seizing protection.
■ Integral diagnostic system.
■ Flue gas temperature monitoring in connection with flue gas tem-
perature sensor.
■ Maintenance display.
■ External fault message facility can be connected.
■ With boiler protection function subject to boiler/system version:
– ThermControl start-up system
– Flow rate reduction for downstream heating circuits
– Shunt pump control
– Control of a constant return temperature raising facility with regu-
lated 3-way mixing valve (only as an alternative to the control of a
cylinder loading system with mixer assembly)
Single boiler systems:
■ Adaptive cylinder temperature controller with priority control (heating
circuit pump off).
■ Auxiliary function for DHW heating (short term heating to a higher
temperature).
■ Control of solar DHW heating and central heating backup in con-
junction with solar control module, type SM1.
■ Control of a cylinder loading system with mixer assembly (only as
an alternative to control of a constant return temperature raising
facility with regulated 3-way mixing valve).
■ Functions via external contacts:
– External demand with set minimum boiler water temperature
– External changeover of stepped/modulating burners
■ Additional functions via EA1 extension (accessories):
– External demand through default set boiler water temperature via
0 to 10 V input
– 3 digital inputs for the following functions:
External blocking
External blocking with fault message input
Fault message input
■ Additional functions via AM1 extension (accessories):
– Control of up to two circulation pumps, if output sÖ is already
assigned at the control unit:
Circulation pump for flue gas/water heat exchanger
Circulation pump for neutralising system
VIESMANN
56
Multi boiler systems with Vitotronic 300-K cascade control unit:
■ Functions via external contacts:
– External blocking
– Start boiler externally as the last one in the boiler sequence
– External changeover of stepped/modulating burners
■ Additional functions via AM1 extension (accessories):
– Control of up to two circulation pumps, if output sÖ is already
assigned at the control unit:
Circulation pump for flue gas/water heat exchanger
Circulation pump for neutralising system
Multi boiler systems with third party control unit:
■ Functions via external contacts:
– Boiler enable/butterfly valve control
– External demand, burner stage 1
– External demand, burner stage 2
– External changeover of stepped/modulating burners
■ Additional functions via EA1 extension (accessories):
– External demand through default set boiler water temperature and
boiler enable via 0 to 10 V input
Note
An EA1 extension must be connected to every Vitotronic 100.
■ Additional functions via AM1 extension (accessories):
– Control of up to two circulation pumps, if output sÖ is already
assigned at the control unit:
Circulation pump for flue gas/water heat exchanger
Circulation pump for neutralising system
Control characteristics
■ P-characteristics with two-point output when using a burner with
multiple stages
PI characteristics with three-point output for modulating burners, if
installed
■ Temperature controller for limiting the boiler water temperature:
95 °C, adjustable to 100, 110 °C
■ Adjusting the high limit safety cut-out:
110 °C, adjustable to 100 °C
■ Maximum boiler water temperature limit:
20 up to 127 °C (lower switching point subject to boiler/boiler coding
card)
■ Setting range of the set DHW temperature:
10 to 60 °C, adjustable between 10 and 95 °C
Boiler coding card
For matching to the boiler (supplied with the boiler).
Setting the operating programs
Frost protection monitoring for the boiler and DHW cylinder is enabled
in all operating programs.
The following operating programs can be selected:
■ Single boiler systems:
– Heating and DHW
– Only DHW
– Standby mode
■ Multi boiler systems:
– Heating
– Standby mode
Summer mode (only in single boiler systems)
("DHW only")
The burner starts only when the DHW cylinder needs reheating (con-
trolled by the cylinder temperature controller).
The respective lower boiler water temperature of each boiler is main-
tained if required.
Gas condensing boilers