iverting circ u 2-port and 3-port zone valves & actuators, PN16 MVI422...MXI422... 2-port valve & actuator MVI422… 3-port valve & actuator MXI422... With on/off characteristics ● ● ● ● ● ● A6V11932500_en--_b 2020-08-12 Stainless steel valve body DN 15, DN 20 and DN 25 Kvs 2.0-3.
Use ● ● For use in ventilating and air-conditioning systems for water-side terminal units in closed circuits, e.g. induction units, fan-coil units, small reheaters and small re-coolers. – 2-pipe systems with 1 heat exchanger for heating and cooling – 4-pipe systems with 2 separate heat exchangers for heating and cooling In closed-circuit heating systems, e.g.: – Separate floors in a building – Apartments – Individual rooms – Floor heating Functions The zone valves are closed when de-energized.
Ordering When ordering, indicate the quantity, product name and number. Example Product number Stock number Product name Quantity MVI422.15 S55310-M107 2-port zone valve, PN16 DN15, Kvs 2.5 1000 ASK39.3 S55845-Z251 Protection shield 1000 Rev. no. See Revision number overview on page 11. Equipment combinations Room thermostats Type Room thermostat compatible to MVI422../MXI422.. RAB... RAB11; RAB11.1; RAB21; RAB31; RAB31.1 RAA... RAA11; RAA21; RAA31…; RAA41 RCC...
Sizing Example: ① ⩒100 = 0.27 l/s ② ∆Pv100 = 9 kPa ③ kvs value required = 3.5 m3/h 3. 0 2.22 ∆Pv100 = Differential pressure across the fully open valve and the valve's control path A → AB (2-port valves), AB → A (3-port diverting valves) by a volume flow ⩒100 ⩒100 = Volume flow through the fully open valve (H100) ∆Pmax = Max.
Engineering Refer to the Mounting notes and Commissioning notes. Note the correct direction of flow, for both two-port and three-port valves as shown in the diagrams below. Recommendation Fit a strainer upstream of the valve to increase reliability. Warning The direction of flow for two-port valves MUST be as indicated by the arrow, from A → B. MVI422…two-port valve De-energized position: Port “A” closed Three-port valves can be used in both diverting and mixing circuits.
Mounting Orientation Comply with the specified direction of flow in all cases (refer to Engineering). Mounting instructions A6V11932502 are enclosed with the packaging. Electrical connection ● Connect electricity as shown in the plant diagram. ● Observe all regulations for eletrical installation. ● Connect the connecting cable to a conduit box. ASK39.3 protection shield Use protection shield (ASK39.3 ) to avoid splash water on the actuator. Mounting instructions A6V11938719 are enclosed with the ASK39.
Commissioning Manual adjustment The valve can be opened to approximately 50 % with a lever and locked into position. The lever automatically disengages when normal operation resumes. Open valve manually The lever is locked into position at a valve opening of approx.
Notes Security CAUTION National safety regulations Failure to comply with national safety regulations may result in personal injury and property damage. ● Observe all national provisions and comply with the appropriate safety regulations. Maintenance MVI422...MXI422... valves require no maintenance. CAUTION When servicing the valve/actuator: ● ● ● Deactivate the pump and turn off power. Close the shutoff valves. Fully reduce the pressure in the piping system and allow pipes to completely cool down.
Technical data Electrical interface Supply voltage ● Tolerance ● Frequency AC 230 V –15 / +10 % 50 Hz/60 Hz Power consumption 6.5 VA Duty cycle 100% Fuse External Control signal On/Off with controller thermostat (phase-cut or pulsewidth-modulated signals are not allowed) Max. number of switching cycles Approx. 10, 000 per year (equivalent to approx.
Standards Product safety ● Overvoltage category EN60730 Section 2.
Revision number overview Siemens Smart Infrastructure Type Valid from rev. no. Type Valid from rev. no MVI422.15 ..A MXI422.15 ..A MVI422.20 ..A MXI422.20 ..A MVI422.25 ..A MXI422.25 ..
Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug Tel. +41 58 724 2424 www.siemens.com/buildingtechnologies 12 Siemens Smart Infrastructure Document ID A6V11932500_en--_b Edition 2020-08-12 © Siemens Switzerland Ltd, 2020 Technical specifications and availability subject to change without notice.
