GRUNDFOS ALPHA2 - PlumbArena.co.uk

GRUNDFOS ALPHA2The Grundfos ALPHA2 domestic circulator is the most advanced energy efficient domesticcirculator of it’s kind on the market today. It is the ideal choice for a variety of domesticcirculation heating systems, having both variable speed pressure controlled operation,and standard selectable three speed operation.The ALPHA2 is an ‘A’ Rated Energy labelled product, achieving the highest possibleenergy savings under the energy labelling scheme. The reduction in powerconsumption has been achieved by using the latest permanent magnet motortechnology. Using pressure controlled operation power consumption can bereduced to as low as 5 watts.The unique AUTOADAPT feature allows the pump to match it’s performance tothe system requirements, helping to reduce noise when thermostatic valves areclosing down.The ALPHA2 models are simple to install as new or replacement pumps, and are 130mm between ports.FEATURES AND BENEFITS• ‘A’ Rated energy label – lowest power consumption• Variable and fixed speed operation – one pump for all jobs• Plug and Pump – no need to open terminal box• Power Display - shows actual power usage & power onPerformance curvesTECHNICAL DATALiquid Temperature: +2°C @ 110°CMaximum Ambient: 37°C @ 82°C FlowMin Inlet Pressure: 1.3m @ 82°C FlowMaximum System Pressure: 10 BarMean Sound Pressure Level:

GRUNDFOS ALPHA2Control of heating systemsThe heat requirements of a building vary greatly and today thermostatic radiator valves efficiently control the systemoutput. This can lead to excessive pump pressure and valve noise. ALPHA2 can not only adapt to these variable conditionsbut reduce electrical energy consumption.FIXED SPEED PUMP MODEWith a fixed speed pump, as the radiator TRV’s close,the system resistance increases (A1 to A2) causing anincrease in pump pressure (∆H 1) which can lead toTRV valve noise.PRESSURE CONTROLLED MODEAs the radiator TRV’s close (A1 to A2) the pump pressureis controlled according to the selected mode (A1 to A3).At the reduced pressure the TRV’s then re-adjust tomaintain the required radiator output. The pump pressurereduces radiator valve noise and power consumption.HFIXED SPEED(l, ll, lll)2HCONSTANT PRESSURE(CP1, CP2)HPROPORTIONAL PRESSURE(PP1, PP2)A 2 1∆H 1A 1Q 2Q 1QA 2 1∆H 2A 1A 3Q 2Q 1QA 2 1∆H 2 A 1Q 2A 3Q 1QALPHA2 FUNCTIONALITY AND SETTINGSHFIXED SPEEDSETTINGSCP2AUTOADAPTPP1 CP1 PP2 CP2PRESSURE CONTROLLEDSETTINGSAUTOADAPTILLUMINATEDOPERATING MODEDISPLAYSETTING PUMP CURVE TYPICALAPPLICATIONI, II, III Fixed SpeedoperationCP1CP2PP1PP2AUTOADAPTLower (CP1) &higher (CP2)constant pressureLower (PP1) &higher (PP2)proportionalpressureSet point withingreen area.Night set backABV = Automatic Bypass ValveSystem withoutTRVsUnderfloor systems.TRV systems withABV installedTRV systems withno mininum flowrequirement*TRV systems andno minimum flowrequirement*Reduced flow atnightTRV = Thermatic Radiator ValveCP1lPP2PP1NIGHT SET BACKOnly for constant running pump systems(not normally needed for UK systems).llIIIQINSTALLATION AND OPERATINGGUIDANCEWhen installing the ALPHA2, please refer tothe Installation and Operating Instructions,if using pump in either constant pressure,proportional pressure or AUTOadapt mode.*Please refer to the boiler manufacturersminimum flow rate requirements whensetting bypass valves.GB/ALPHA2/DBS/0208