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5712 717 v1.0
Vitotronic 100, KW10B Installation, Start-up and Service
Altering Settings
Altering the Indoor/Outdoor Control Setting Internal
The adjustable high limit determines the maximum available boiler (supply) temperature.
Therefore, it functions as a high limit.
The curve for the outdoor reset function can be adjusted by opening the control top cover.
Factory settings
Heating curve slope (S4)
“n“ selection = 1.2
Warm weather shut-down (WWSD) (S5)
“N“ selection = 70 °F (21 °C)
To calculate the correct setting for the heating curve,
use the following formula:
heating curve slope =
design supply temp. - WWSD temp.
WWSD temp. - design outdoor temp.
Example:
design outdoor temp.:
5 °F (-15 °C)
WWSD temperature: 70 °F (21 °C)
design supply temp.: 160 °F (71 °C)
heating curve slope =
160° F - 70° F 90° F
= = 1.4
70° F - 5° F 65° F
Slope adjustment
As outdoor temperatures drop, heat losses from a space become greater and the heating system supply water
temperature must be raised to maintain a constant room temperature. The heating curve value describes how many
degrees the supply water temperature is raised for a one degree drop in outdoor temperature. The supply temperature
starts to increase when the outdoor temperature falls below the warm weather shut-down (WWSD) setting.
For further assistance, please see section
entitled “Helpful hints” in the Operating
Instructions and User’s Information Manual.
Note: The graph displays various slopes for a single
WWSD setpoint of 18° C.
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