Siemens SFP21/18 User manual
4865
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
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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 kvs PN class Data sheet
[m3/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 2
ASC2.1/18 ASC2.1/18 Auxiliary Switch 1
Delivery
Rev. no.
ASC2.1/18
auxiliary switch
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Siemens Building Technologies Elctromotoric Actuators CA1N4865en
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Notes
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
and AC 24V for SFP71/18)
•Phase cut and pulse-width-modulated signals are not suitable.
•Recommended number of opening/closing operations: approx. 50 per day, with
200 heating or cooling days
Mounting instructions are enclosed with the packaging. 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 valve manually Locking the lever into position at a
valve opening of approx. 90%
01600
01602
Releasing the lever manually
01601
Rotate lever as far as the mechanical stop, and release.
Engineering
Electrical connection
Caution
Mounting
Orientation
Commissioning
Operating
Manual adjustment
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Siemens Building Technologies Elctromotoric Actuators CA1N4865en
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Maintenance
•The actuators require no maintenance.
•In the event of a fault, the actuator can be replaced without removing the valve. The
operating voltage must be switched off during this process.
•The actuators cannot be repaired.
Disposal
The device contains electrical and electronic 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 under "Equipment combinations", page 2.
The use of type SFP.. actuators with third-party valves invalidates any warranty
offered by Siemens Building Technologies / HVAC Products.
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Technical data
SFP21/18 SFP71/18
Power supply Operating voltage
Voltage tolerance
AC 230 V
±15%
AC 24 V
±20%
Frequency 50 Hz
Max. power consumption 9.8 VA
Fuse protection for incoming cable Max. 3 A (external)
Control Control signal On/off via temperature controller
Phase cut and pulse-width-modulated signals
are not suitable.
Opening/closing operations Recommended number: approx. 10 000 / year
(equivalent to approx. 50 per day)
Operating data Position with de-energized actuator
2-port valve (VVP47..)
3-port valve (VXP47.. and VMP47..)
A →AB closed
A →AB closed, B →AB open
Positioning time Opened by motor: 10 s
Closed by spring: 30…50 s
Nominal stroke 2.5 mm
Positioning force 135 N
Manual adjustment 0...90 %
Admissible temperature of
medium in the connected 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 protection
Upright to horizontal
IP30 to EN 60529
Environmental compatibility ISO 14001 (Environment)
ISO 9001 (Quality)
SN 36350 (Environmentally compatible products)
RL 2002/95/EG (RoHS)
Dimensions / Weight Dimensions See "Dimensions", page 6
Weight
without auxiliary switch
with auxiliary switch
0.585 kg
0.692 kg
0.585 kg
0.692 kg
Materials Base-plate
Housing
Die-cast aluminum
Polycarbonate
Housing colors Base and cover Light gray, RAL7035
Auxiliary switch (optional) 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 mm2)
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 –5 ... +50 °C
Humidity 5 ... 85 %rh < 95 %rh 5 ... 95 %rh
Connecting cable
Cable SFP21/18
AC 230 V
SFP71/18
AC 24 V
Cable color Connection Cable color Connection
Operating voltage Brown L Red G
2-core Blue N Black G0
Auxil. switch ASC2.1/18 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. Product number Valid from rev. no.
SFP21/18 H SFP71/18 H
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Siemens Building Technologies Elctromotoric Actuators CA1N4865en
2009-2011 Siemens Switzerland Ltd. Sub
j
ect to chan
ge
HVAC Products 20.04.2011
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