Viessmann VITODENS 222-F Technical Manual page 72

Control units
(cont.)
Connectivity
■ Vitoconnect 100, type OPTO1 (accessories):
WLAN interface for remote control of the heating system using the
Vitotrol Plus or the ViCare app. For further information, see the
data communication technical guide. Suitable for all Vitodens 2xx
and Vitodens 3xx.
■ Integral LAN interface in Vitodens 333-F and 343-F (until 08/2016).
If LON communication (e.g. Vitogate or Vitotronic 200-H) is
required, replace the integral LAN module with the LON communi-
cation module (accessories). If an internet connection is also
required, a Vitocom must be ordered separately.
Control characteristics
PI characteristics with modulating output
Time switch
Digital time switch (integrated into the programming unit)
■ Individual day and seven-day program
■ Automatic summer/wintertime 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
switching periods per day
Shortest switching interval: 10 minutes
Power reserve: 14 days
Setting the operating programs
The heating system frost protection (see frost protection function)
applies to all heating programs.
The following heating programs can be selected:
■ Heating and DHW
■ Only DHW
■ Standby mode
External heating program changeover in conjunction with EA1 exten-
sion.
Frost protection function
■ The frost protection function will be started when the outside tem-
perature drops below approx. +1 °C.
With frost protection, the heating circuit pump is switched ON and
the boiler water is maintained at a lower temperature of approx.
20 °C.
The DHW cylinder will be heated to approx. 20°C.
■ The frost protection function will be stopped when the outside tem-
perature rises above approx. +3 °C.
6
Summer mode
Operating program "w"
The burner starts only when the DHW cylinder needs reheating or
when DHW is drawn from a gas condensing combi boiler.
Adjusting the heating curves (slope and level)
The Vitotronic 200 controls the boiler water temperature (= flow tem-
perature of the heating circuit without mixer) and the flow tempera-
ture of the heating circuits with mixer (in conjunction with the exten-
sion kit for one heating circuit with mixer) in weather-compensated
mode. The boiler water temperature is automatically boosted by
between 0 and 40 K higher than the currently required set flow tem-
perature (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
building to be heated.
Adjusting the heating curves matches the boiler water temperature
and the flow temperature to these operating conditions.
Heating curves:
The upper boiler water temperature is limited by the temperature lim-
iter and the temperature set at the electronic maximum thermostat.
The flow temperature cannot exceed the boiler water temperature.
VIESMANN
72
Heating curve slope
90
80
70
60
50
40
30
20
20 15 10 5 0 -5
Outside temperature in °C
Heating systems with low loss header
When using hydraulic separation (low loss header), connect a tem-
perature sensor for use in the low loss header.
Boiler water temperature sensor
The boiler water temperature sensor is connected to the control unit
and built into the boiler.
Specification
Sensor type Viessmann NTC 10 kΩ at 25 °C
Permissible ambient temperature
– Operation 0 to +130 °C
– Storage and transport –20 to +70 °C
Cylinder temperature sensor
For Vitodens with loading cylinder or solar cylinder also an additional
outlet temperature sensor.
These sensors are connected to the control unit and built into the
boiler or cylinder.
Specification
IP rating
Sensor type
Permissible ambient temperature
– During operation
– During storage and transport
Outside temperature sensor
Installation site:
■ North or north-west facing wall of the building
■ 2 to 2.5 m above the ground, for multi storey buildings in the upper
half of the second floor
Connection:
■ 2-core lead, length up to 35 m with a cross-section of 1.5 mm
(copper)
■ Never route this lead immediately next to 230/400 V cables.
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-10 -15 -20 -25 -30
IP 32
Viessmann NTC 10 kΩ at
25 °C
0 to +90 °C
–20 to +70 °C
2
VITODENS