Viessmann VITOCROSSAL 300 CU3A 35 Operating Instructions Manual page 22

Central Heating - Heating Circuit (HC)
Heating Curve
Example: Changing the heating curve slope to 1.5
A graph clearly shows the change in the
heating curve as soon as you alter the value
for the slope or shift.
Depending on various outside temperatures (shown on
the horizontal axis), the assigned set supply temperatures
for the heating circuit are highlighted in white.
End Central Heating
22
Vitocrossal 300 CU3A 26 to 199 Operating
Your system's heating characteristics are affected by the
slope and the shift of the selected heating curve. Further
information about the heating curve can be found under
"Terminology" on page 42.
Factory setting:
H Slope: 1.4
H Heating curve shift: 0
H Standard room temperature (set value): 68°F (20ºC)
H Reduced room temperature (set value): 64°F (18ºC)
Setting the heating curve
Factory setting:
H "Slope": 1.4
H "Shift" of the heating curve: 0
Extended menu:
1.
2. "Heating"
3. Poss. for the required heating circuit.
4. "Heating curve"
5. "Slope" or "Shift"
6. Set the required value.
Note: Tips on when and how to change the heating curve
slope and shift are displayed by pressing ?.
For the primary heating circuit (refer to page 28)
Standard menu
1. for the operating program:
"Only DHW" (no central heating)
Or
"Standby mode" (frost protection active)
2. OK to confirm.
For all heating circuits
Extended menu
1.
2. "Heating"
3. Poss. for the required heating circuit.
4. "Heating program"
5. "Only DHW" (no central heating)
Or
"Standby mode" (frost protection active)