Viessmann VITOCROSSAL 200 Type CM2 Technical Manual page 67

Control units
(cont.)
■ Indicators:
– Common flow temperature
– DHW temperature
– Operating data
– Diagnostic details
– 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 cascade control of the system flow temper-
ature in a multi boiler system with up to four boilers with
Vitotronic 100, type GC1B or GC4B (modulating), and the flow tem-
perature of two heating circuits with mixer.
■ The boilers are controlled by the Vitotronic 100, type GC1B or GC4B,
according to a freely selectable boiler sequence strategy.
■ Electronic maximum and minimum limitation of the flow temperature
in heating circuits with mixer.
■ Demand-dependent heating circuit pump shutdown.
■ Adjustment of a variable heating limit.
■ Pump anti-seizing protection.
■ Integral diagnostic system.
■ 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.
■ 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 regu-
lated 3-way mixing valve (only as an alternative to the control of a
cylinder loading system with mixer assembly)
Gas condensing boilers
■ Functions via external contacts:
– External operating program changeover/External mixer open
– External blocking/External mixer closed
– External demand with minimum set flow temperature
■ Additional functions via extension EA1 (accessories):
– External demand by setting a default flow temperature via 0 to 10
V input
– Switching a feed pump to a substation
or
Signalling 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
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 three-point output
■ 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 a heating circuit with mixer: 0 to 40 K
■ Setting range of the set DHW temperature:
10 to 60 °C, adjustable between 10 and 95 °C
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
Shortest switching interval: 10 min
Power reserve: 14 days
Setting the operating programs
Frost protection monitoring (see frost protection function) for the heat-
ing system is enabled in all operating programs.
The following operating programs can be selected:
■ Heating and DHW
■ Only DHW
■ Standby mode
External operating program changeover possible, for all heating cir-
cuits together or separately.
Frost protection function
■ The frost protection function is switched on if the outside temperature
drops below approx. +1 °C. This means that the heating circuit
pumps are started and the flow temperature is maintained at a min-
imum temperature of 10 °C.
■ The frost protection function is switched off if the outside temperature
rises above approx. +3 °C, i.e. the heating circuit pumps stop.
Summer mode
("DHW only")
9
VIESMANN
67