TAC 2112 - Variable Night Setback; Morning Heating

TAC 2112, Manual Functional Description
TAC AB, 1999-08-01 0-004-7459-3 (GB), 7:13(
22
)
7.3.10 Variable night setback
To ensure that the heating installation is able to reset the room
temperature after a night setback in the event of a low outdoor
temperature, the controller uses what is known as variable night
setback. This means that the magnitude of the setback is a function of
the damped outdoor temperature according to the curve below.
0%
100%
-10 0 5-5 10 15 20-15 25-20-25
x1
P 34
P 33
x0
Damped
Curve for variable night setback
At the outdoor temperature x0, night setback does not take place at
all, but then increases gradually as the outdoor temperature rises.
If points x0 and x1 are set to the same level, full night setback is
attained irrespective of the outdoor temperature.
Note that the parameters P 33 and P 34 also affect the morning boost
function.
Parameters
P No. Parameter Min. Max. Step Default Comments
P 33 Outdoor temp., 0% night setb. –30 °C P 34 1 °C –10 °C Affects morning boost
P 34 Outd. temp., 100% night setb. P 33 20 °C 1 °C 10 °C Affects morning boost
7.3.11 Morning heating
The time for the transition to daytime operation is optimised, which
means that the controller increases the supply of heat before the set
time so that the correct room temperature is attained at the set time.
Output K2 is set during the heating time.