Viessmann KW10 Operating Instructions And User's Information Manual page 5

Altering the Maximum Boiler Water Temperature
Space Heating Circuit Switch
The adjustable high limit (AHL) limits the maximum boiler water temperature when
a call for heat is made. The call for heat is typically made by a room thermostat.
Select an appropriate boiler water temperature (based upon advice from your
heating contractor).
The factory default setting is between 104 and 167°F / 40 and 75°C.
An elevated setting between 104 and 212°F / 40 and 100°C is possible if an
adjustment has been made by the heating contractor.
Turn selector to the right
(clockwise)
or
Turn selector to the left
(counter-clockwise)
The space heating circuit switch is only operational if a Viessmann
DHW Pump Module (Accessory) is installed and connected to the control.
For heating systems with domestic hot
water production:
H Winter operation:
for space heating and DHW
production, set space heating circuit
switch " " to " ."
H Summer operation:
for DHW production only, set space
heating circuit switch "
CAUTION
Space heating pump is fully disabled; it
will not reactivate during cold weather
conditions.
Boiler water temperature limit
increases.
Boiler water temperature limit
decreases.
" to " ."
Operation
5