Viessmann VITOCROSSAL 200 Type CM2 Technical Manual page 62

Control units
(cont.)
■ Settings:
– Set room temperatures
– DHW temperature
– Operating program
– Time programs for central heating, DHW heating and DHW circu-
lation pump
– Economy mode
– Party mode
– Holiday program
– Heating curves
– Codes
– Actuator tests
9
■ Advertisements
– Boiler water temperature
– DHW temperature
– Operating data
– Diagnostic details
– Maintenance and fault messages
■ Available languages:
– German
– Bulgarian
– Czech
– Danish
– English
– Spanish
– Estonian
– French
– Croatian
– Italian
– Latvian
– Lithuanian
– Hungarian
– Dutch
– Polish
– Russian
– Romanian
– Slovenian
– Finnish
– Swedish
– Turkish
Functions
■ Weather-compensated control of the boiler water temperature
(= system flow temperature) and flow temperature.
■ Electronic maximum and minimum limitation of the flow temperature
in heating circuits with mixer.
■ Demand-dependent heating circuit pump and burner shutdown (not
for burners in boilers with a lower boiler water temperature limit).
■ Adjustment of a variable heating limit.
■ Pump anti-seizing protection.
■ Integral diagnostic system.
■ Flue gas temperature monitoring in connection with flue gas tem-
perature sensor.
■ Maintenance display.
■ Adaptive cylinder temperature control with priority control (heating
circuit pump off, mixer closed).
■ Auxiliary function for DHW heating (short term heating to a higher
temperature).
■ Control of solar DHW heating and central heating backup plus
graphic illustration of the solar yield in conjunction with the 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).
■ External fault message facility can be connected.
■ Screed drying program for the heating circuits with mixer.
VIESMANN
62
■ With boiler protection functions subject to boiler version:
– ThermControl start-up system
– 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)
■ Functions via external contacts:
– External operating program changeover/External mixer open
– External blocking/External mixer closed
– External demand with set minimum boiler water temperature
– External changeover of stepped/modulating burners
■ Additional functions via extension EA1 (accessories):
– External demand through default set boiler water temperature via
0 to 10 V input
– Switching a feed pump to a substation
or
Signalling of reduced mode (reduction of the heating circuit pump
speed) via a potential-free output
– 3 digital inputs for the following functions:
External operating program changeover, separate for heating cir-
cuits 1 to 3
External blocking with fault message input
Fault message input
Brief operation of the DHW circulation pump
■ Additional functions via extension AM1 (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
Heating circuit pump
The requirements of EN 12831 for calculating the heat load are met.
To reduce the heat-up load, the reduced room temperature will be
raised in the case of low outside temperatures. The flow temperature
will be raised for a limited time to reduce the heat-up time after a set-
back phase.
According to the Energy Saving Ordinance [Germany], the tempera-
ture in each room must be individually controlled, for example by ther-
mostatic valves.
Control characteristics
■ P-characteristics with two-point output when using a burner with
multiple stages
PI characteristics with three-point output when using a modulating
burner
■ 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
■ Setting range for heating curves:
– Slope: 0.2 to 3.5
– Level: −13 to 40 K
– Maximum limit of the flow temperature: 10 to 127 °C
– Minimum limit of the flow temperature: 1 to 127 °C
■ Differential temperature for heating circuits with mixer: 0 to 40 K
■ 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).
Time switch
Digital time switch (integrated into the programming unit)
■ Individual day and seven-day program, annual calendar
■ Automatic summer/wintertime changeover
■ Automatic function for DHW heating and DHW circulation pump
■ The default settings for time, day and standard switching times for
central heating, DHW heating and the DHW circulation pump are set
at factory
■ Switching times are individually programmable, i.e. up to four time
phases per day
Gas condensing boilers