TAC 2112 - Page 46

TAC 2112, Manual Functional Description
7:14 (22), 0-004-7459-3 (GB) 1999-08-01, TAC AB
Without reference sensor
Without a reference sensor, the heating time varies with the damped
outdoor temperature according to the curve below.
20
120
-10 0 5-5 10 15 20-15 25-20-25
P 38
P 37
y0
(minutes)
H
eat
i
ng t
i
me
y1
P 39
Damped
360
Curve for morning heating
10
-10 0 5-5 10 15 20-15 25-20-25
P 36
0
(°C)
M
orn
i
ng
b
oost
P 34
P 33
Damped
x1x0
Curve for morning boost
The morning heating can be blocked by setting the
Max. heating time
parameter (P 37) to 0 hours.
Note that the parameters P 33 and P 34 also affect the function for
variable night setback.
With reference sensor
The controller automatically calculates an appropriate starting time
using a reference sensor so that the correct temperature is achieved at
the set time for daytime operation. This calculation is adaptive (self-
adjusting).
During the heating time, the controller controls towards the setpoint
for daytime operation with night control effect and with a fixed
supplement to the supply setpoint. This addition is shown by the
Max.
morning boost
parameters (P 36).
The heating time is calculated according to the following:
t = (y-value from curve) × (room temperature - day setpoint, room)
If a reference sensor has been installed, the y-value from the curve
shows the heating time per degree the temperature deviates from the
day setpoint.