Datasheet Content
[{"filename":"VU-BVU_en.pdf","text":"deltapumps.com\n\n\n\n\n VU\n BVU\n\n Universal fuel unit\n for oil burners\n\n\n\n DE115-0121\ndelta-elektrogas.com\n\f DELTA – TECHNICAL MANUAL\n\n\n\nUniversal fuel unit\nfor oil burners\nType VU, BVU\n\n\n1- Applications\nThe DELTA Universal fuel unit is an efficient and modern\noil burner pump. Since its mounting flange, hub and\nshaft sizes are manufactured to international standards\n(EN 225-1), it can be fitted to every type of high pressure\noil burner or transfer pump applications. Its features\nallow an easy pump replacement with every other type\nof oil pump. The same unit is provided with bilateral\nnozzle ports and is suitable for both clockwise and\ncounter clockwise rotation.\n\n\n WARNING\nFor the use with low viscosity fuel (lower than\n2.5cSt, i.e. Kerosene) standard pump can be used\nwithout exceeding 12 bar.\nTo pump biodiesel or fuel containing it in any\npercentage, it is necessary the “B” version with\nspecial seals. On request the pump can be provided\nfree of nonferrous metals.\nThis unit must not be used to pump water or acid.\n\n\n\n2- Operation\nThe VU fuel unit consists of a pump, solenoid valve, filter\nand pressure regulator valve (1) housed within one\ncasting. The pumping action is obtained from a gerotor\n(2), where the inner rotor is connected to the drive shaft\n(3). The pump casting provides the various oil ways, for\nthe suction (6), return (5) and nozzle ports (9). Pressure\n(8) and vacuum (7) gauge ports are also provided.\nUnder the vacuum gauge is located the rotation From the suction side, the gears pass the oil to the\nselector (2). See the Installation and Service Section. pressure chamber, where it comes up against the head\n of the piston. Due to the build up of pressure, the piston\nThe VU unit is supplied in two pipe version (self priming).\n is forced back against the pressure regulating spring.\nOn start up, the rotating gears purge the air from the The flow of pressurized oil is interrupted by an\nsuction chamber, through a vent groove in the piston to incorporated solenoid valve, and can, therefore, be\nthe return line in two pipe version, and through the opened following the start of the motor (pre-purge), or\nnozzle line (after the solenoid valve opening) in one pipe interrupted before stopping the motor itself (instant shut-\nversion. off of the flame preventing the nozzle dripping). The\nOn initial commissioning, it is possible to bleed the air excessive oil discharges to the return side (or by-passes\nmore quickly, through the pressure gauge port. in the one pipe version). It will be realized of course that\n the spring tension, which is varied by the regulator\nBecause a vacuum now exists oil, due to atmospheric screw, regulates the pressure of oil required.\npressure, enters the suction chamber through the filter.\n The pump can be converted from the two pipe version to\n the single pipe version, removing the by-pass plug (4)\n from the return port.\n When the unit is converted to the single pipe version, on\n initial commissioning the air must be bled through the\n pressure gauge port (in this case lift installation are not\n recommended).\n\n\n\n\n 2-6\n\f DELTA – TECHNICAL MANUAL\n\n\n3- Pump identification VU 1 L R 2 FA\nPump type\nVU = standard version\n\nBVU = biodiesel version\n(explicit request for nonferrous metals absence)\n\nNozzle capacity\n(see graph)\n\nRotation - factory setting (seen from shaft end)\nR = clockwise\nL = counter clockwise\n\nNozzle line open - factory setting (seen from cover)\nR = right\nL = left\n\nPipes system - factory setting\n1 = one pipe\n2 = two pipes\n\nCoil type\nFA = NF84 230VAC 50/60Hz\nFC = NF84 24VAC 50/60Hz\n\n(coil with connector plug and cable set)\n\n\n\n4- Technical specifications\nOil viscosity …………………………………. 1,2 ÷ 12 cSt\nOil temperature ……………………………... 60°C max.\nPower consumption ………………………... See graphs\nNozzle capacity ……………………………... See graphs\nPressure range …………………………….... 6 ÷ 18 bar\nSuction line vacuum ……………………….. 0,5 bar max.\nSuction line pressure ……………….……... 2 bar max.\nReturn line pressure ……………………….. 2 bar max.\nStarting torque ……………………………… 0,1 Nm max.\nRotation speed ……………..………….……. 3500 rpm max.\nStandard strainer……….….………………... Nylon mesh 150µ, 20cm²\nDimensions (EN 225-1) …………………….. Hub Ø32, shaft Ø8\nConnections (ISO 228-1) …………………... Inlet – Return : G1/4\n Nozzle port : G1/8\n Pressure – vacuum gauge : G1/8\nWeight ……………………………………….. 1050 g\nStandard factory settings ………………… Pressure setting: 10 ±0,3 bar\n Standard coil: 230 VAC 50/60Hz\n Standard cable set: 3 cores, 700 mm\n\n5- Solenoid valve specifications\nPower absorbed .……………………………. 9 W\nVoltage tolerance …………………………… -15% / +10%\nAmbient temperature .……………………... 0°C / 60°C\nOperating pressure ……………………….... 25 bar max.\nFlow factor (VDI/VDE 2173) ……………….. 0,059 m3/h\nCut-off pressure …………………………….. 2 bar\nStandards ……………………………………. EN ISO 23553-1\n\n\n 3-6\n\f DELTA – TECHNICAL MANUAL\n\n\n6- Diagrams\n\n\n\n\n Nozzle capacity Power consumption\n\n\n\n\n7- Overall dimensions\n\n\n\n\n 1 Pressure regulation 7 Vacuum gauge\n 2 Rotation selector 8 Pressure gauge\n 3 Shaft sealing 9 Nozzle ports\n 4 By pass 10 Solenoid valve\n 5 Return\n 6 Suction\n\n\n\n\n 4-6\n\f DELTA – TECHNICAL MANUAL\n\n\n\n\n8- Bypass installation\n\nTo convert the DELTA fuel unit from the two pipe version\nto the single pipe version, do the following:\na) Using a 4 mm Allen key, unscrew the bypass plug\n from the return port (Fig. 1).\nb) Fit a 1/4\" plug into the return port (Fig. 2).\n\n\n WARNING\nIn the two pipe version the air is bled through the\nreturn port. After conversion, the air must be bled\nmanually, through the pressure gauge port.\nMake sure that the by-pass plug is not used in a\nsingle pipe installation, because the fuel unit will not\nfunction properly and damage to the pump and Fig. 3\nburner motor could result.\n\n\n\n 9- Selection of rotation\n\n The VU unit is provided with a screw for the selection of\n rotation, located under the vacuum gauge plug (V).\n To change the direction of rotation do the following:\n a) Using a screw driver, remove the 1/8\" plug from\n vacuum gauge port. Under the plug, inside the\n pump, is the selector screw.\n NOZZLE NOZZLE\n\n\n\n\n P VU1\n L\n\n\n V\n b) Turn it 90° up to the stop, to change the rotation\n UNIVERSAL FUE\n\n INLET\n Made\n Paten\n (Fig. 3).\n TV20\n UN\n\n After conversion, check the O-ring is located on the\n bottom of the vacuum port and replace the 1/8\" plug.\n\n Fig. 1\n\n\n\n\n Fig. 4\n\n Clockwise Counter Clockwise\n (seen from shaft end) (seen from shaft end)\n NOZZLE NOZZLE\n\n L\n\n R\n P VU1 V\n UNIVERSAL FUEL UNIT\n Made in Italy\n INLET RETURN\n Patent pending\n TV2000U000022\n UN L\n IV ERSA\n\n\n\n\n WARNING\n Fig. 2 The selection screw must be oriented with the\n groove vertical (L) or horizontal (R), otherwise the\n fuel unit will not function properly and damage could\n 19 result (Fig.4).\n\n\n\n\n 5-6\n\f DELTA – TECHNICAL MANUAL\n\n\n\n\n10- Installation and Maintenance 12- Nozzle Cut-Off Test\n1. Make sure that the by-pass plug is not used in a single pipe Fuel oil is not compressible but air is. Air trapped in the nozzle\ninstallation, because the fuel unit will not function properly and line, anywhere between the fuel units nozzle port and the\ndamage to the pump and burner motor could result. nozzle itself, will compress during burner operation. Following\n2. The rotation selector must be oriented with the groove burner shutdown, any trapped compressed air will expand\nvertical (L) or horizontal…
