Title: 370.02-SB401 - Siemens VXF40.80-100.pdf
We recommend installation in the return pipe, as the temperatures in this pipe are lower for applications in heating systems, which in turn, extends the stem sealing gland's life.Always use a strainer upstream of the valve to increase the valve's functional safety.For media below 0 °C, use the electric stem heating element to prevent the valve stem from freezing in the sealing gland. For safety reasons, the stem heating element has been designed for AC 24 V / 30 W operating voltage.Both valve and actuator can easily be assembled at the mounting location. Neither special tools nor adjustments are required.The valve is supplied with Mounting Instructions 74 319 0519 0.90°90°1 0 Z 2 6 3 4When mounting, pay attention to the valve's flow direction symbol →.Mixing from A / B to ABABAB2 0 Z 0 3 4 4Diverting from AB to A / BABB3A0 Z 0 3 4 4Commission the valve only if the actuator has been mounted correctly.Valve stem retracts: Valve stem extends: