S Oil burners fuel unit with pressure regulating
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Oil burners fuel unit with pressure regulating Type S Certified Quality System Printed in Italy - DE119/0404

Oil burners fuel unit with pressure regulating Type S The DELTA fuel unit is an efficient modern oil burner pump with compact design and since its mounting flange, hub and shaft sizes are manufactured to international standards (EN 225), it can be fitted to every oil burner. Suitable for a one or two pipe systems. Bilateral delivery ports. Bilateral suction ports. Self priming. Balanced pressure regulator/cut-off valve giving constant pressure and effective cut-off (two pipe). Special shaft seal. Silent operation. Easily fitted and adjustment. Provided with pressure gauge port. 2-...

Pump type Nozzle capacity (see graphs) Rotation (seen from shaft end) R = clockwise L = counter clockwise Pressure ranges 3 = 2 ÷ 14 bar 4 = 6 ÷ 18 bar 5 = 12 ÷ 30 bar Oil Type G = light oil N = medium oil Pipes system 1 = one pipe 2 = two pipes 5- Technical specifications Oil viscosity ………………………………… Oil temperature …………………………….. Power consumption ………………………. Nozzle capacity …………………………….. Nozzle line …………………………………... Suction line vacuum ………………………. Suction line pressure ……………………... Return line pressure ……………………… Rotation speed …………………………….. Standard strainer…………………………… 5 ÷ 300 cSt 80°C max...

1 Pressure regulation 5 Return 6,7 Suction 8 Pressure gauge 9,10 Nozzle port 11 Flange

To convert S fuel unit from the two pipe version to the single pipe version, do the following: 1) Using a 5 mm Allen wrench, unscrew the by-pass plug from the return port (Fig. 5). IN 2) Insert and screw a 1/4" plug into the return port (Fig. 6). CAUTION: In the two pipe version the piston performs a positive nozzle cut-off and the air is bled through the return port. After the conversion, the air must be bled manually, through the pressure gauge. To convert S fuel unit from the single pipe version to the two pipe version, do the following: IN a) Remove the 1/4" plug from the return port...

Installation and service instructions 10- Installation and maintenance 12- Nozzle cut-off test (two pipe) • Make sure that the by-pass plug is not used in a single pipe installation, because the fuel unit will not function properly and damage to the pump and burner motor could result. Fuel oil is not compressible but air is. Air trapped in the nozzle line, anywhere between the fuel units nozzle port and the nozzle itself, will compress during burner operation. Following burner shutdown, any trapped compressed air will expand displacing the oil in the nozzle line, forcing continued oil flow...