Viessmann Vitocrossal 300 Service Manual page 47

Vitocrossal 300 CU3A 26 to 57 Service
Adjusting the Heating Curves
Legend
A Heating curve for operation with standard room
temperature
B Heating curve for operation with reduced room
temperature
Example using the factory settings
Legend
A Start of operation with standard room temperature
B Set boiler water or supply temperature in accordance
with the selected heating curve
C Set boiler water or supply temperature in accordance
with coding address "FA": 122°F + 20% = 140°F
D Duration of operation with raised set boiler water or
supply temperature in accordance with coding address
"Fb": 60 min
(continued)
50°C + 20% = 60°C
Raising the reduced room temperature
During operation with reduced room temperature,
the reduced set room temperature can be automatically
raised subject to the outside temperature.
The temperature is raised in accordance with the selected
heating curve, but no higher than the set standard room
temperature.
The outside temperature limits for the start and end of
the temperature raising can be adjusted via coding
addresses "F8" and "F9".
Reducing the heat-up time
During the transition from operation with reduced room
temperature to operation with standard room temperature,
the boiler water or supply temperature will be raised
in accordance with the selected heating curve. The
boiler water or supply temperature can be automatically
increased.
The value and duration of the additional increase of the
set boiler water or supply temperature can be adjusted in
coding addresses "FA" and "FB".
Service
47