Viessmann VITOCROSSAL 200 Type CM2 Technical Manual page 63

Control units
(cont.)
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, i.e. the heating circuit pump is switched
on and the boiler water is maintained at a lower temperature (see
chapter "Operating conditions with Vitotronic boiler control units").
■ "Standby mode":
The frost protection function is switched off if the outside temperature
rises above approx. +3 °C. This means that the heating circuit pump
and burner are switched off.
■ "Heating and DHW"
The frost protection function is switched off if the outside temperature
rises above approx. +3 °C. This means the heating circuit pump is
switched off and the lower boiler water temperature for the relevant
boiler is maintained if required (see chapter "Operating conditions
with Vitotronic boiler control units").
Summer mode
("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.
Heating curve setting (slope and level)
The Vitotronic controls the boiler water temperature (= system flow
temperature) and the flow temperature of the heating circuits with
mixer in weather-compensated mode. The boiler water temperature is
automatically regulated to between 0 and 40 K above the highest cur-
rently required set flow temperature (delivered condition 8 K).
The flow temperature required to reach a specific room temperature
depends on the heating system and the thermal insulation of the build-
ing to be heated.
Adjusting the heating curve matches the boiler water temperature and
the flow temperature to these operating conditions.
The upper boiler water temperature is limited by the temperature con-
troller and the electronic maximum limiter.
Gas condensing boilers
110
100
90
80
70
60
50
40
30
20 15 10 5 0
Outside temperature in °C
Specification
Rated voltage
Rated frequency
Rated current
Power consumption
Safety category
IP rating
Mode of operation
Permissible ambient temperature
– During operation
– During storage and transport
Rated relay output breaking capacity
sÖ Heating circuit pump
or
Primary pump, cylinder loading sys-
tem
or
Circulation pump, flue gas/water heat
exchanger
or
Switching output
sA Circulation pump for cylinder heat-
ing
sK DHW circulation pump
sL Shunt pump/boiler circuit pump
gÖ Central fault message
gS Mixer motor, extension kit, mixer
Motor, 3-way mixing valve, constant
return temperature raising
or
Motor, 3-way mixing valve, cylinder
loading system
Total
fA Burner
lÖ Burner, 2-stage
lÖ Burner, modulating
Slope
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
-5 -10 -15 -20 -25 -30
230 V~
50 Hz
2 x 6 A~
10 W
I
IP 20 D to EN 60529
Ensure through design/
installation
Type 1B to
EN 60 730-1
0 to +40 °C
Installation in living
spaces or boiler rooms
(standard ambient con-
ditions)
−20 to +65 °C
4(2) A, 230 V~
4(2) A, 230 V~
4(2) A, 230 V~
4(2) A, 230 V~
4(2) A, 230 V~
0.2 (0.1) A, 230 V~
Max. 6 A, 230 V~
6(3) A, 230 V~
1 (0.5) A, 230 V~
0.2 (0.1) A, 230 V~
VIESMANN
9
63