Suntec Oil pump AUV47R 9856-6 AUV47R9856

The Suntec AUV47R 9856-6 is a gear-type oil pump designed for use with diesel fuel and kerosene in single-pipe or two-pipe burner systems. It features an integrated filter with a mesh size of 150 µm and a filter area of 6 cm². The pump has a factory pressure setting of 9 bar, a maximum pressure of 25 bar, and operates at speeds up to 3600 rpm. It includes two nozzle outlets (G 1/8") and ports for pressure and vacuum gauges, with a power consumption of 9 W and a weight of 1100 g. The pump is equipped with automatic air venting in two-pipe systems and has a protection class of IP54.

When selecting a replacement oil pump of this type, ensure that the mounting hub conforms to EN 225 and the shaft diameter is 8 mm. The connection threads must be cylindrical according to ISO 228/1, with suction and return lines typically G 1/4" and nozzle outlets G 1/8". Verify the operating viscosity range (1.0–12.0 mm²/s) and fuel temperature limits (0–60 °C) match the system requirements. The pump's bypass plug configuration must be set according to the piping system: installed for two-pipe operation, removed for single-pipe operation. Also confirm the electrical specifications (voltage and frequency) are compatible with the burner control.

Common failures in oil pumps of this kind include loss of pressure or erratic nozzle flow, often caused by a clogged filter or worn gears. If the pump fails to deliver fuel, check the integrated filter for debris and ensure the bypass plug is correctly positioned for the system type. Leaks may occur at the shaft seal or connections, leading to air ingress and unstable combustion. In two-pipe systems, air venting issues can cause the burner to lock out; inspect the piston cavity for blockage. If the pump runs but no fuel reaches the nozzle, test the solenoid valve for continuity and proper operation.