TAC 2112 - Return Temperature Limitation

TAC 2112, Manual Functional Description
7:10 (22), 0-004-7459-3 (GB) 1999-08-01, TAC AB
Parameters
P No. Parameter Min. Max. Step Default Comments
P 07 Room temperature 0 °C 45 °C 0,1 °C - With reference sensor only
P 08 Calculated SP, room temp. –35 °C 70 °C 0,1 °C - With reference sensor only
P 09 Setpoint room, day 5 °C 30 °C 0,5 °C 21 °C With reference sensor only
P 10 Setpoint room, night 5 °C 30 °C 0,5 °C 18 °C With reference sensor only
P 30 Control effect room, day 0,5 20 0,5 2 With reference sensor only
P 31 Control effect room, night 0,5 50 0,5 10 With reference sensor only
P 32 Dead zone, room 0 °C 5 °C 0,1 °C 0,3 °C With reference sensor only
7.3.7 Return temperature limitation
The return water temperature can be limited by the controller. The
magnitude of this limitation is determined by a separate reset curve
with the max. return temperature as a function of the damped outdoor
temperature. The reset curve is based on two curve points as depicted
below.
30
40
50
60
70
80
-10 0 5-5 10 15 20-15 25-20-25
x1
y0
y1
P 46
P 47
P 48
P 45
x0
Damped
Reset curve for return temperature limitation
Limitation controller
The limitation of the return temperature is controlled by a controller
using the following data:
P band: 10–200
°
C
I time: 3 minutes
Dead zone: 1
°
C
The output signal from the controller has an effect on the setpoint for
the supply temperature.
The limitation controller has no effect in the operating modes
“heating off” and “manual control”.