Data Sheet for Product

ManualsBrandsSiemens ManualsTEVA (BC4)Zone Valve Actuators SFA.., SFP..

CA1N4863en

2021

-07-16

Smart Infrastructure

863

Electromotoric Actuators

for zone valves

SFA21/18

SFA71/18

• SFA21/18 AC 230 V operating voltage, 2-position control signal

• SFA71/18 AC 24 V operating voltage, 2-position control signal

• Positioning force 200 N

• 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

• For Siemens zone valves V..I46..

• Primarily in heating, ventilation, air conditioning and refrigeration systems for water-

based control of low-temperature hot water and cooling water.

Summary of content (8 pages)

PAGE 1
4 863 Electromotoric Actuators for zone valves • • • • • • • • SFA21/18 SFA71/18 SFA21/18 AC 230 V operating voltage, 2-position control signal SFA71/18 AC 24 V operating voltage, 2-position control signal Positioning force 200 N 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 • For Siemens zone valves V..I46..
PAGE 2
Type summary Type Accessories Operating voltage Positioning signal Connecting cable 10 s 2-position 1.8 m Description Switching point Switching capacity Connecting cable Auxiliary switch at approx. 50 % stroke AC 250 V / 3(2) A 1.8 m AC 230 V SFA71/18 AC 24 V Type ASC2.1/18 Ordering Positioning time SFA21/18 When ordering please specify the quantity, product name and type code. Example Delivery 2 electric actuators, type SFA71/18 and 2 auxiliary switches, type ASC2.
PAGE 3
Accessories Auxiliary switch ASC2.1/18 The optional auxiliary switch can be fitted to the actuator with two screws. It switches at a stroke of approx. 50 %. 0 … 50 % : Q11 → Q12 closed 50 % … 1 : Q11 → Q12 open 01468 Q11 → Q14 open Q11 → Q14 closed See «Technical data» on page 5 for further information on the auxiliary switch. Engineering notes The admissible temperatures (see «Technical data», page 5) must be observed.
PAGE 4
Commissioning notes • Check the wiring. • Check the functioning of the actuator and of the auxiliary switch, if fitted. Manual adjustment The valve can be opened manually by use of a lever on the actuator. When the valve is approximately 90 % open the lever locks into position. When electrical operation is resumed, the locking mechanism is released automatically.
PAGE 5
Technical data Power supply Operating voltage Voltage tolerance Frequency SFA21/18 SFA71/18 AC 230 V AC 24 V ± 15 % ± 20 % 50 / 60 Hz 50 / 60 Hz Power consumption 12 VA Primary fuse Control Max. 3A (external) Positioning signal 2-position 1) Parallel operation of several actuators permitted 2) Opening / closing operations recommended number: approx. 10'000 / year (equivalent to approx. 50 / day) Operating data Position with de-energized actuator 2-port valve (VVI46..
PAGE 6
General ambient conditions Operation EN 60721-3-3 Transport EN 60721-3-2 Storage EN 60721-3-2 Environmental conditions Class 3K3 Class 2K3 Class 2K3 Temperature 1…50 °C -25…70 °C -25…70 °C 5…85 % r. h. < 95 % r. h. < 95 % r. h. Humidity Connecting cable SFA21/18 actuator blue brown 4863Z07 SFA71/18 actuator black N System neutral L System potential AC 230 V red 4863Z08 G0 System neutral G System potential AC 24 V ASC2.
PAGE 7
Dimensions 4863M01 58 80 Actuator without auxiliary switch SFA21/18, SFA71/18 79.7 Dimensions in mm 112 4863M02 79.7 Actuator with auxiliary switch SFA21/18, SFA71/18 with ASC2.
PAGE 8
Issued by: Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a 6300 Zug Switzerland Tel. +41 58 724-2424 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd, 2019 Technical specifications and availability subject to change without notice.