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Functions
CA1N4865en
20.04.2011
Elctromotoric Actuators
for small valves VVP47.., VXP47.., VMP47..
•
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)
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.
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.
SFP21/18
SFP71/18
Siemens Building Technologies
HVAC Products
4
865
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Related Manuals for Siemens SFP21/18
Summary of Contents for Siemens SFP21/18
- Page 1 • Auxiliary switch, type ASC2.1/18 (optional) 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.
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Page 2: Type Summary
→ Auxiliary switch closed (50 ... 100 % stroke) • Manual adjuster locked into position (approx. 90 % stroke): → Auxiliary switch closed See "Technical data" for further information on the auxiliary switch, page 5. Siemens Building Technologies Elctromotoric Actuators CA1N4865en HVAC Products 20.04.2011... - Page 3 Notes Engineering The admissible temperatures (see "Technical data", page 5) must be observed. • The actuator may be operated only with alternating current (AC 230 V for SFP21/18 Electrical connection and AC 24V for SFP71/18) • Caution Phase cut and pulse-width-modulated signals are not suitable.
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Page 4: Maintenance
" ", page 2 Equipment combinations The use of type SFP.. actuators with third-party valves invalidates any warranty offered by Siemens Building Technologies / HVAC Products. Siemens Building Technologies Elctromotoric Actuators CA1N4865en HVAC Products... -
Page 5: Technical Data
Switch type Changeover contact Switching point at approx. 50 % stroke Switching capacity AC 250 V 3 A resistive 2 A inductive Connecting cable 3-core, 1.8 mm 18 AWG (0.96 mm Siemens Building Technologies Elctromotoric Actuators CA1N4865en HVAC Products 20.04.2011... - Page 6 SFP21/18, SFP71/18 with ASC2.1/18 01687 01688 Revision numbers Product number Valid from rev. no. Product number Valid from rev. no. SFP21/18 SFP71/18 2009-2011 Siemens Switzerland Ltd. Subject to change Siemens Building Technologies Elctromotoric Actuators CA1N4865en HVAC Products 20.04.2011...