Controller Description of control Regula Duo controls heating and cooling in sequence. It operates with an ON/OFF control process, where the dead zone between heating and cooling is 1°C, and there is a coupling difference of 0.3°C for each output, to make sure temperature fluctuations does not cause actuators to open and close unnecessarily. See Figure 1 for explanation of control process and Figure 2 for description of a situation where setpoint is alternating between heating and cooling. lindab | we simplify construction Regula Duo Output On Heating 1 °C Dead zone Cooling Off Room 0.3 °C 0.3 °C temp. Coupling diff. Heating output Coupling diff. Cooling output Figure 1. Control process with dead zone and coupling difference. Room temperature (°C) Dead zone ON/OFF 1.0° 2 2 2 2 . .4 4 2 2 2 2 . .2 2 2 2 2 2 . .0 0 2 2 1 1 . .8 8 2 2 1 1 . .6 6 2 2 1 1 . .4 4 2 2 1 1 . .2 2 2 2 1 1 . .0 0 2 2 0 0 . .8 8 2 2 0 0 . .6 6 0 0 7 7 : : 0 00 0 ON/OFF control 0 0 8 8 : :0 0 0 0 0 0 9 9 : : 0 0 0 0 Time (h) Figure 2. Setpoint alternating between heating and cooling. Coupling difference 0.3° Coupling difference 0.3° 1 1 0 0 : : 0 00 0 1 1 1 1 : : 0 0 0 0 Lindab reserves the right to make changes without prior notice 3 2018-05-08
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