Adjusting The Heating Curve - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
Testing Actuators and Sensors on the Vitotronic 300-K

Adjusting the Heating Curve

Room
setpoint
temperature
Slope
Outdoor temperature
Information regarding the mixing valve motor rotational
direction
The supply temperature must rise when the mixing valve
opens.
If the temperature drops, either the motor is turning in
the wrong direction or the mixing valve set is incorrectly
fitted (observe the mixing valve installation instructions).
Verify installation and if installed correctly.
Checking sensors
From the home screen tap the following buttons:
1. Tap "Menu".
2. Select "Service".
3. Enter "viservice" password.
4. Select "Diagnosis".
5. Select group.
6. Scan actual temperature of the relevant sensor.
The heating curves illustrate the relationship between
the outdoor temperature and the boiler water or supply
temperature.
Simplified: The lower the outdoor temperature, the higher
the boiler water or supply temperature.
The boiler water or supply temperature in turn affects the
room temperature.
Settings in the factory set condition:
H Slope = 1.4
H Shift = 0
Note: If the heating system includes heating circuits
with mixing valves, then the supply temperature
of the heating circuit without mixing valve is higher
by a selected differential [15°F (8 K) in the factory
set condition] than the supply temperature of the
heating circuits with mixing valves.
The differential temperature can be changed
at coding address 9F in the "General" group.
Slope setting ranges:
H Underfloor heating systems: 0.2 to 0.8
H Low temperature heating systems: 0.8 to 1.6
Commissioning
(continued)
37