TA UVR 64 Operation And Installation Instructions Manual
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Contents
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Additional functions52Differential control F = keeps the temperature constant between two sensors.Keeping the temperature difference constant between T1 and T2, for instance, allows for“shifting” operation of the collector. If T1 drops due to lower irradiation, the difference be-tween T1 and T2 thus drops. The control unit then lowers the speed, which increases thedwell time of the medium in the collector and hence the difference between T1 and T2.An inversely written F means an inverse speed characteristic, i.e. the speed increases withfalling difference.Note: This difference “d” always has to be greater than the switch-off difference diff of thebasic function. If „d“ is lower, the basic function of pump release blocks before the speedcontrol has reached the desired value. Limiter function L = If a set temperature event occurs, the speed control starts, thuskeeping a sensor constant.If, for instance, T3 reaches 55°C (activation threshold), the collector should be kept at acertain temperature. Maintaining a sensor then works as with absolute value control. An in-versely written L means an inverse speed characteristic, i.e. the speed increases with fallingtemperature.The three described methods can be activated all together. If the absolute value control(maintaining a sensor) and the differential control (maintaining the difference between twosensors) are both active, the slower of the two speeds “wins out”. The limiter function “over-writes” the speed results from other control methods. A set limit can thus block the control ofabsolute values or differences.In the example, keeping the collector temperature at 60°C with the absolute value control isblocked when the tank has already reached 55°C at the top = the fast provision of hot wateris complete and is now to be continued with full volume flow (and hence a lower temperaturebut slightly better efficiency). To do so, a value that value automatically requires full speed(such as S1 = 10°C) has to be entered as the new desired temperature in the event control.WaveformWave packets - only for circulating pumps with standard motor dimensions. Here, individualhalf cycles are bled in to the pump motor. The pump runs on pulses and only produces asmooth flow of the heat transfer medium when the rotor’s moment of inertia has been over-come.Benefit: Great dynamics of 1:10, well suited for usual commercial pumps without internalelectronics and a motor length of around 8 cm.Drawback: Linearity depends on the pressure loss; there is some noise, not suitable forpumps with evidently deviating motor diameters and / or length from 8 cm. |
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