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Siemens Building Technologies 

Elctromotoric Actuators 

CA1N4865en 

HVAC Products 

 

20.04.2011 

Type summary 

Prod. no. 

Operating voltage 

Positioning time 

Control signal 

Connecting cable

SFP21/18 

AC 230 V 

SFP71/18 

AC 24 V 

10 s 

2-position 

1.8 m 

 

Prod. no. 

Description 

Switching point 

Switching capacity  Connecting cable

ASC2.1/18 

Auxiliary switch 
open/closed 

At approx. 50% stroke 

AC 250 V / 3(2) A 

1.8 m 

Ordering 

 
Actuators, valves and accessories are supplied separately. The actuator is supplied 
with the AL50 ring. 
 
See overview 

Equipment combinations  

Type code 

Valve type 

k

vs

 

PN class 

Data sheet 

 

 

[

m

3

/h

]

 

 

 

VVP47.. 

2-port valves 

0.25...4.0 

VXP47.. 

3-port valves 

0.25...4.0 

VMP47.. 

3-port valves with T-bypass 

0.25...2.5 

PN16 4847 

 

Technical design / Mechanical design 

The valve is opened electrically by the actuator and closed by spring force.  
It incorporates a synchronous motor, a gear mechanism and a return spring. 
The electric motor is overload-resistant and anti-locking, so that continuous operation is 
possible. The maximum stroke is limited mechanically. The closing motion, by contrast, 
includes an overrun for the gear mechanism. This protects the gear mechanism from 
mechanical shock and increases service life. 
The valve is connected by an 1.8 m cable, which is an integral part of the actuator. 
 

Accessories 

The optional auxiliary switch can be fitted to the actuator 
with two screws. 
It switches at a stroke of approx. 50 %. 

 

Valve actuator de-energized: 

 Auxiliary switch open 

 

Voltage applied to valve actuator: 

 Auxiliary switch closed (50 ... 100 % stroke) 

 

Manual adjuster locked into position  
(approx. 90 % stroke): 

 Auxiliary switch closed 

01468

See "Technical data" for further information on the auxiliary switch, page 5. 
 

Accessories 

Example: 

Product number 

Stock number 

Designation 

Quantity 

SFP71/18 SFP71/18 Electromotoric 

Actuators 

ASC2.1/18 ASC2.1/18 Auxiliary 

Switch 

Delivery 

Rev. no. 

ASC2.1/18 
auxiliary switch 

Summary of Contents for SFP21/18

Page 1: ...P47 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 de...

Page 2: ...chronous motor a gear mechanism and a return spring The electric motor is overload resistant and anti locking so that continuous operation is possible The maximum stroke is limited mechanically The closing motion by contrast includes an overrun for the gear mechanism This protects the gear mechanism from mechanical shock and increases service life The valve is connected by an 1 8 m cable which is ...

Page 3: ...kaging Mount ring AL50 prior to mounting the actuator onto V P47 valves 85 85 Check the wiring Check the functioning of the actuator and of the auxiliary switch if fitted The valve can be opened manually by use of a lever on the actuator When the valve is approximately 90 open this locks into position When electrical operation is resumed the locking mechanism is released automatically Opening the ...

Page 4: ...ctronic components and must not be disposed of together with domestic waste This applies in particular to the PCB Legislation may demand special handling of certain components or it may be sensible from an ecological point of view Current local legislation must be observed Warranty The technical data given for these applications is valid only when the valves are used with the actuators described u...

Page 5: ...nected valve 1 110 C Electrical connection Connecting cable integral 2 core 1 8 mm 18 AWG 0 96 mm2 Norms and Standards CE conformity to EMC directive 2004 108 EC Immunity EN 61000 6 2 Industrial 3 Emissions EN 61000 6 3 Residential Low Voltage Directive 2006 95 EC Electrical safety EN 60730 1 Protection class to EN 60730 Section 2 7 Class II Class III Pollution degree to EN 60730 2 Housing protect...

Page 6: ...Black Red Input Black Red Input optional Black Blue N C contact Black Blue N C contact 3 core Black Pink N O contact Black Pink N O contact Dimensions All dimensions in mm 01466 80 79 7 112 01467 58 Actuators without auxiliary switch SFP21 18 SFP71 18 Actuators with auxiliary switches SFP21 18 SFP71 18 with ASC2 1 18 01687 106 79 7 112 01688 58 Revision numbers Product number Valid from rev no Pro...

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