4
865
Elctromotoric Actuators
for small valves VVP47.., VXP47.., VMP47..
SFP21/18
SFP71/18
•
SFP21/18 AC 230 V operating voltage, 2-position control signal
•
SFP71/18 AC 24 V operating voltage, 2-position control signal
•
135 N positioning force
•
Spring return
•
Manual adjustment
•
For direct mounting with union nut (no tools required)
•
Integral 1.8 m connecting cable
•
Auxiliary switch, type ASC2.1/18 (optional)
Use
The SFP21/18 and SFP71/18 actuators are used in conjunction with zone valves
VVP47.., VXP47.. and VMP47.., primarily in heating, ventilation, air conditioning and
refrigeration systems for water-based control of low-temperature hot water and cooling
water. The SFP.. actuators together with the 3-port valves VXP47.. are suitable for low
leakage change over applications.
Functions
The electric actuator requires an on/off controller (thermostat) to control the valve. If the
temperature of the medium deviates from the set-point, the controller output signal
causes the actuator to drive the valve open. When the temperature of the medium
reaches the set-point, the control signal is cut off and the valve closes again.
CA1N4865en
20.04.2011
Siemens Building Technologies
HVAC Products
