Wilo-Star-Z 20/1, 25/2, 25/2 DM, 25/6

ENGLISH4. Description ofProduct andAccessories4.1 Description of Water ServicePumpsSeries Star-Z circulating water servicepumps have been specially designedfor use in conjunction with domestic/drinkingwater service systems.They are, by material selection anddesign, corrosion proofed against anyresidual parts in domestic/drinkingwater. Speed setting: Z 25/6 pump isequipped with a rotary switch in theterninal box to enable manual;3-speed control [1(max) - 2 - 3(min)].At minimum speed the maximumspeed is reduced to approx.40 ... 50 %.The power input is reduced toapproximately 50 %.4.2 Scope of Supply– Pump, complete.– Installation and OperatingInstructions.4.3 AccessoriesAccessories available and/or requiredon separate order:– Union for pipe connections,– timer switch SK 601 (DOL fornon-overloading 1-phase pumps,3-phase only in conjunction withcontactor boxes SK 602 /622 orstarter/contactors,– S1R-h plug-in timer module for1-phase motors only, exceptZ 25/6.5. Siting/Installation5.1 Installation– Install pump only after all welding/soldering on the pipe system iscompleted and the pipe system hasbeen thoroughly flushed out to beclear of foreign matter and impurities,as these may cause damageto the pump.– Mount pump in an easily accessibleposition in order to facilitate later inspectionand exchange.– If used to handle domestic/drinkingwater a non-return valve must beprovided and installed at the dischargeside.– To avoid draining and re-filling thewhole of the pipe system on exchangeof pump it is recommendedto provide and install isolating valvesat suction and discharge ports of thepump, to be positioned in such away to prevent leakage dripping onthe pump motor or its terminal box.– Pump to be mounted with the shaftin the horizontal plane in such a waythat it is not stressed by the pipework.Observe mounting positionsas shown in Fig. 1.11