Viessmann B1KA Installation And Service Instructions Manual page 64

Troubleshooting
Boiler Connection
Setting the heating curve
Heating curves illustrate the relationship between the out-
door temperature, the set room temperature and the boiler
water temperature or supply temperature.
The lower the outdoor temperature, the higher the boiler
water temperature or supply temperature.
In order to guarantee sufficient heat and minimum fuel
consumption at any outdoor temperature, the conditions
of your building and your heating system must be taken
into consideration. The heating curve is set by your heat-
ing contractor for this purpose.
Example:
For outdoor temperature −14°C:
A Underfloor heating system, slope 0.2 to 0.8
B Low temperature heating system, slope 0.8 to 1.6
C Heating system with a boiler water temperature in
excess of 75°C, slope 1.6 to 2.0
Factory settings
Outdoor temperature
Slope = 1.4 and set point
Legend
A Changing the slope:
The gradient of the heating curves changes.
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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
(continued)
Slope
Outside temperature
Frost protection function
The frost protection function requires an outside
temperature sensor to be connected. The frost protection
function becomes active at outside temperatures of
<41°F (<5°C). The burner starts and the boiler water
temperature is held at 68°F (20°C).
Adjusting the Heating Curve
1. Tap MODE.
2. Tap / until CONFI flashes.
3. Tap OK to confirm.
"P" is displayed in left hand display area. The right
hand display area flashes. Enter 12 with / .
4. OK to confirm.
"1" flashes in left hand display area.
5. Use / to select "15".
6. OK to confirm.
The right hand display flashes
Here, the heating curve slope can be adjusted.
represents the heating curve 0.2, adjustable to
02
(heating curve slope 3.4).
7. Tap / to select heating curve slope.
8. OK to confirm.
The selected value is adopted.
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