Viessmann Cascade control unit Installation, Operating And Service Instructions page 21

Operating conditions
Summer mode
The function activates if the adjusted outside temperature is higher than the
set room temperature in standard mode plus the set "Difference summer
mode"; central heating remains OFF . You can adjust the period during which
the average outside temperature is calculated.
A
C
A Required room temperature
B Average outside temperature
Set value (multi-boiler control unit)
Time constant
summer mode
Differential
summer mode
In the "Operating details" menu (see page 15) you can scan whether the
control unit is set to "Summer mode".
(cont.)
The average outside temperature will be
calculated over the set period. Fluctuations in
24h
outside temperature will strongly influence the
average value, if you set a short period.
Fluctuations will have a lesser effect on the
average value if you set longer periods.
2 K
B
D
C Differential summer mode
D Summer mode
Functions
t in h
21