ACVATIX™ Electrothermal actuators STA..21.., STP..21.. For radiator valves, small valves and PICV ● ● ● ● ● ● ● ● ● ● ● ● ● A6V12986007_en--_b 2022-02-07 ST..121.. Operating voltage AC/DC 24 V ST..321.. Operating voltage AC 230 V Positioning force 110 N Connecting cable 1 m / 2 m / 2 m halogen-free / 5 m Direct mounting on valve thread M30x1.5 mm Closing dimension 10.8 mm (NC), 15.
Use ● ● Used in interior rooms. For Siemens valves: – Radiator valves: VDN.., VEN.., VUN.. – Small valves: VD1..CLC.., VVP47.., VXP47.., VMP47.. – Zone valves: VVI46.., VXI46.. – PICV: VPP46.., VPI46.., VQP46.., VQI46.. ● – MiniCombiValves (MCV): VPD.., VPE.., VPU.. For third-party valves: – Direct assembly: Honeywell/MNG, Heimeier, Herz, Comap, Watts (Cazzaniga), Oventrop – Assembly with adapter: See Accessories [▶ 6] Technical design Actuator operation The electrothermal actuators STA.. and STP..
Definition NC/NO Version NC «normally closed»: After mounting the actuator, the valve is closed in the idle state. When voltage is applied to the actuator, the actuator stem retracts and the valve is opened. Valve state with voltage-free actuator: closed. Version NO «normally open»: After mounting the actuator, the valve is open in the idle state. When voltage is applied to the actuator, the actuator stem extends and the valve is closed. Valve state with voltage-free actuator: open. STA..21.. STP..21..
The valve is closed in a de-energized state for most valve applications featuring thermal actuators. Actuators with the opposite control action are used when the reverse function is required: The valve is opened in a de-energized state. ⇒ NO function: STA.. + NC valve / STP.. + NO valve Response at de-energized actuator Valve Type STA..21.. STP..21.. Radiator valves VDN.., VEN.., VUN.. Closed Open 1), 2) Small valves VD1..CLC.. Closed Open 1), 2) VVP47.., VPI47.., VMP47..
Some controllers drive the thermal valve actuators via PDM/TPI signals. This increases the response time. For optimal control, the ambient temperature must be <40 °C. Pulse-duration modulation/Time Proportional Integral Position indication The movement and actual position of the actuator stem is indicated by the yellow stroke indicator. The yellow part indicates: ● The actuator stem is extended. ● NC valve is closed. ● NO valve is opened. Type summary Type Stock no. STA121 S55174-A177 STA121.
Scope of delivery Actuators, valves and accessories are packaged and delivered separately. Ordering example Type Stock no. Designation No. of pieces STA121.L20 S55174-A181 Electrothermal actuator 1 AV53 BPZ:AV53 Third-party valve adapter on Danfoss RA-N (RA2000) 1 Accessories Adapter for third-party valves Type Stock no.
Product documentation Title Content Document ID Electrothermal actuators STA..21.., STP..21.. Data sheet: Product description A6V12986007 Mounting instructions A5W00214679A (A6V12984110) Valves Radiator valves VDN1.., VEN1.. Data sheet: Product description N2105 Radiator valves VDN2.., VEN2.., VUN2.. N2106 MiniCombiValves (MCV) VPD.., VPE.. N2185 Small valves VD1..CLC.. N2103 2-port and 3-port zone valves PN16 VVI46.., VXI46.. N4842 2-port and 3-port terminal unit valves PN16 VVP47..
Mounting The mounting instructions A5W00214679A are included in the package. Mounting positions The actuators may be installed in all positions. IP54 remains guaranteed. Mounting on the valve Disconnect the device from the power supply before assembly. Do not use tools like pipe wrenches or spanners. a) Remove the protective cover from the valve body. b) If necessary, insert a closing dimension adapter. c) Place the actuator on the valve and tighten the screw cap by hand.
Dismounting Disconnect the device from the power supply before disassembly. Note NC-variants – reactivate First-Open function. Attention! The device and/or pipes may still be hot. Wait until the device has cooled down. a) For NC variants STA..21..: First Open function: Reset to the First Open position. - Raise the coverlet in the opening with a screwdriver, until a clicking sound is heard and the lever is back on the front. b) Loosen the screw cap by hand and remove the actuator from the valve.
Technical data Power supply Operation voltage Power consumption Inrush current Rated impulse voltage Connecting cable Length ST..121.. AC/DC 24 V +/-20 %, 50...60 Hz (AC version) ST..321.. AC 230 V +/-15 %, 50...60 Hz ST..121.. 1.6 W ST..321.. 1.7 W ST..121.. 200 mA ST..321.. 150 mA Switch-on power 24 V~/= 5 W / 5 VA Switch-on power 230 V~ 35 W / 35 VA ST..121.. (24 V variants) 1500 V ST..321.. (230 V variants) 2500 V STA121, STA321 STP121, STP321 1m ST..L20..
Directives and standards Product standard IEC 60730-1 and IEC 60730-2-14 Low Voltage Directive 2014/35/EU EN 60730-1, EN 60730-2-14 RoHS- Directive 2011/65/EU EN IEC 63000 EMC-Directive 2014/30/EU EN 60730-1, EN 60730-2-14 EAC Eurasia compliance UKCA Great Britain conformity Environmental compatibility Product environmental declaration A6V13037506 2) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefi
Dimensions Type STA..21.. STP..21.. H1 (NC) ∅1 ∅2 39 40.5 H2 (NO) L [mm] [kg] 68 - - 72 >32 0.10 Revision no. Type Item number Valid from rev. no. Type Item number Valid from rev. no. STA121 S55174-A177 ..A STP121 S55174-A179 ..A STA121.L20 S55174-A181 ..A STP121.L20 S55174-A183 ..A STA121.L20H S55174-A195 ..A STP121.L50 S55174-A187 ..A STA121.L50 S55174-A185 ..A STP321 S55174-A180 ..A STA321 S55174-A178 ..A STP321.L20 S55174-A184 ..A STA321.
