Brochure - Unical Lattner Condensing Hot Water Boilers

The modulating pumpALKON 70MODULATION PUMP(standard supply)3500 ÷ 1000 l/hMAX Output 70 kW∆t 16°CMIN Output 10 kW∆t 9°CCONSTANT WATERFLOW RATE (optional)3000 l/hMAX Output 50 kW∆t 14°CMIN Output 10 kW∆t 3°CALKON 50MODULATION PUMP(optional)3000 ÷ 900 l/hMAX Output 50 kW∆t 14°CMIN Output 10 kW∆t 10°CWith the modulating pump the ∆t (refer to table) between the flowand return is maintained at a high level and subsequentlythe boiler will operate in condensing condition for a longer time.It is a well know fact that the system’sperformance, or rather, the energy supplyis conditioned by the temperature differencebetween the flow and return (∆t).Well then, it is not sufficient to modulatethe generator’s power, above all withcondensing boilers. In order to improve theboiler efficiency it is necessary to maintainthe return temperature as low as possible.Therefore, the ALKON's electronics, incombination with the heating controller, whenthe supplied output decreases, reduces thenumber of revolutions of the pumpand therefore the hourly water flow rate,maintaining the ∆t (temperature difference)practically constant.ALKON 70 is delivered, as standard, withmodulating pump.For ALKON 50 the pump is optional andit is possible to make a choice betweenthe modulating or fixed flow rate pump,thus allowing the highest installationflexibility.ALKON heating system designThe ALKON condensing boiler permitsmany types of solutions for every system.A typical layout can be seen below: theALKON is a rapid generator withLAYOUT OF 2 DIRECT/MIXED AND DHW PRODUCTION HEATING ZONESa low water content, which faithfully followsthe variations of the heating loadwith maximum fuel saving.Provision for a pump will have to be madeon the basis of the circuit’s characteristicsand therefore, interface the boiler’s variousheating loads via the mixing header.ReturnFlowE8heating controllerAdditionalSafety Devices KitMixingheaderDHW CircuitHeating CircuitIts various and very important tasks are:To make independent the connected circuits.To act as “separator” so as to permitthe separation and collection of the sludgeof the system.To vent automatically the air contained inthe circuits.If a DHW storage tank is foreseen, a loadingpump must be fitted.The zones or various C.H. systems,for example in a block of flats with severalapartments, can be controlled by the E8heating controller.Filter