Refrigeration, air-conditioning and cooling technology - 2007.pdf
Refrigeration, air-conditioning and cooling technology - 2007.pdf
Refrigeration, air-conditioning and cooling technology - 2007.pdf
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PLH_KKK_32_85.QXP 25.05.2007 10:11 Uhr Seite 54FUSE PROTECTION OF PUMPS AND REFRIGERATING MACHINESSitesThe st<strong>and</strong>ard pumps must be protected from theweather <strong>and</strong> installed in a dry frost -/dust-free,well-ventilated <strong>and</strong> non-explosive atmosphere.In the case of outdoor installations, special motors<strong>and</strong> special corrosion protection are required.The installation of st<strong>and</strong>ard pumps with the motor<strong>and</strong> terminal box facing downwards is notpermissible. Free space (at least about 1.2 mwithout space requirement for material on twosides) is to be provided for dismounting the motor,lantern <strong>and</strong> impeller. For a nominal motorpower greater than 4 kW, a suitable tackle supportfor installation <strong>and</strong> maintenance work isrecommended. If the pumps are installed higherthan 1.8 m off the ground, there should be onsiteworking platforms which are permanently installedor which can be set-up any time in mobileform.The minimum dimension for the measuringpoint A d <strong>and</strong> A s is 2 times the pipe diameter,for U s 5+Nq/53 <strong>and</strong> for U d 2.5. It is recommendedto install pressure gauges with a test cock.All rated power data <strong>and</strong> operating values applyat a rated frequency of 50 Hz, a rated voltageof 230 /400 V to 3 kW or 400/ 690 V starting at4 kW, a maximum coolant temperature (KT - <strong>air</strong>temperature) of max. 40°C <strong>and</strong> an installationaltitude of up to 1000 m above mean sea level.For cases outside of these parameters a powerrating reduction must be applied or a larger motoror a higher insulation class must be selected.Borehole <strong>and</strong> submersible pumps are to have apermanent minimum <strong>and</strong> maximum water coverage,according to their specifications. Thereshould always be sufficient room for lowering<strong>and</strong> pulling up the pumps <strong>and</strong> their pipework.In the case of sump installations, intermediateplatforms for installation <strong>and</strong> maintenance workmust always be available according to the validaccident prevention regulations.To test the pump capacity, an inlet <strong>and</strong> outletsection is to be provided in front of <strong>and</strong> behindthe pump during pipe installation.Minimum distances of the measuring pointsfor checking the pump pressureU dA dDDA sU s54 Subject to change without prior notice 02/2007 WILO AG
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