Issue K Series ultrasonic thermal energy meters (KDK90F series) exhibit the following issues: 4–20 mA flow output shows a significant delay of approximately 60 seconds. Product Line Field Devices Environment K Series Ultrasonic Heat & Cool Meters (KDK90F series) Meter with Deluxe Power Supply Dual 4–20 mA output module configured for thermal power and flow output Cause The ~60-second delay in 4–20 mA output is due to the meter operating in adaptive mode (L-code = 1), where integration intervals can be up to 64 seconds under steady flow conditions. Resolution For 4–20 mA signal delay: Change the L-code setting from 1 (adaptive mode) to 4 to reduce integration time to approximately 2 seconds. This change can be performed using the METERTOOL HCW program and optical head interface. To enable programming, remove the top of the KDK90F device briefly to open a 4-minute configuration window. Important considerations for analog output module: The 4–20 mA module requires a dedicated galvanically separated 24 VAC/DC power supply. The receiving system power supply must not be shared with the analog output signal input. The meter and analog module may share the same 24 V supply if compliant with specifications.

  Issue The status of the Lights and Blinds buttons on a TRC (Touchscreen Room Controller) is not updated, and the buttons do not function as expected. Product Line EcoStruxure Building Operation, Field Devices Environment TRC, all models, with firmware version 2.2.0 and newer Cause The Lights and Blinds control buttons on the TRC were originally developed for a specific application using an RP-C controller. When this application is not present, the buttons do not operate. The buttons depend on logic that is not built into the TRC by default. A Lua script is required to define the command behavior and update the status of these controls. Resolution A sample Lua script is provided in the article attachment: TRC3500 Lighting Scenes Test R1.zip This sample can be used as a baseline for implementation. General approach: Download and review the provided sample Lua script. Modify the script to match the required control logic, inputs, and outputs. Load the Lua script into the TRC using EcoStruxure Building Operation (EBO). Verify that the script is running correctly. Test the Lights and Blinds buttons to confirm proper operation. If further customization is required, adapt the Lua script to align with the system design and controller interactions.

Issue Uncertainty about whether an additional DALI power supply can be added to an EcoStruxure Building Operation (EBO) DALI installation, and confusion regarding the actual DALI current output capability of the CRS controller (64 mA vs. 250 mA). Product Line EcoStruxure Building Operation Environment RP-C Controller with DALI (CRS) DALI field bus integration Cause The confusion originates from documentation references to a 250 mA DALI value, which is a general DALI specification statement indicating that the controller includes an integrated DALI power supply. The CRS hardware itself is limited to a maximum DALI supply current of 64 mA. Additional misunderstanding existed between: Connecting an external DALI power supply in parallel with the CRS DALI output (not supported) Using a true galvanically isolated DALI repeater with its own external power supply (supported) Resolution Adding an additional DALI power supply is supported only when using a true galvanically isolated DALI repeater. The repeater must electrically separate the CRS DALI line from the output side and regenerate the DALI signal. The following configurations are supported: The DALI repeater draws minimal current (approximately 2 mA) from the CRS DALI line The repeater provides a new DALI output with its own externally powered DALI power supply No parallel connection exists between the CRS internal DALI power supply and another DALI PSU The following configurations are not supported: Adding a second DALI power supply directly in parallel with the CRS DALI output Using DALI expanders that act as DALI gear on the input and rebroadcast on the output Regarding DALI current capability: The CRS DALI supply current is 64 mA only The CRS cannot operate at 250 mA at any time The 250 mA reference is a DALI standard classification and not an operational capability of the CRS From a hardware and software perspective, the use of a galvanically isolated DALI repeater is technically safe and supported.

Issue Customers need to determine how many SpaceLogic TC900 Protocol Series thermostats can be connected to the COM A or COM B RS-485 ports of a SmartX Server on a BACnet MS/TP network. The unit load contribution of the TC900 device is not clearly documented, making it difficult to calculate the maximum supported device count. Product Line EcoStruxure Building Operation, Field Devices Environment SpaceLogic TC900 Protocol Series thermostat SmartX Server BACnet MS/TP (RS-485) network Cause Public documentation does not explicitly state the BACnet MS/TP unit load (UL) of the SpaceLogic TC900 Protocol Series thermostat. Without this value, planners cannot accurately calculate the allowable number of devices per RS-485 segment. Resolution The Worksheet for Configuration of RS-485 Bus with Generic RS-485 Devices can be applied with answers to the transceiver interface attributes below. The TC900 Thermostat uses a TP8485E RS-485 transceiver, which has the following characteristics: Reduced 1/8 unit load (0.125 UL) Failsafe transceiver (does not require external biasing) Onboard bias resistors of 47 kΩ Because of the onboard bias resistors, the effective contribution to the MS/TP bus is higher than the transceiver UL alone. Effective Unit Load Calculation Transceiver Transceiver Unit Load Transceiver Failsafe TC900 Circuit Bias Circuit Bias Load Total Unit Load Isolated 485 Bus TP8485E 0.125 Yes 47k ohm 0.255 0.38 No   Based on the BACnet MS/TP standard maximum of 32 UL per RS-485 segment: 32 ÷ 0.38 ≈ 82 devices Up to 82 TC900 Sensor Units can be connected per SmartX Server COM port, based on unit load calculations. RS-485 Network Considerations The TC900 does not have an isolated RS-485 interface and conforms to Generic RS-485 Network Device Configuration 1. A network made up only of TC900 Thermostats typically requires: One 120 Ω termination resistor at each end of the bus No additional bias resistors Additional Notes The maximum recommended node count may be further reduced by system architecture, cabling, baud rate, or performance requirements. Increasing the number of MS/TP devices increases bus latency. RS-485 repeaters may be required for networks approaching higher node counts. When both LonWorks and BACnet MS/TP are used on the same Automation Server, the network with more than 10 devices is treated as the main network, and the other is limited to 10 devices. Refer to the Architectural Guidelines for further limitations and guidance.

expanded instructions and fixed links

Issue Understanding what valve authority is and how to improve it for stable control in hydronic systems. Product Line Field Devices Environment Any hydronic system using control valves such as PICVs, globe valves, or zone valves. Cause Poor valve authority occurs when the control valve represents too small a proportion of the total circuit pressure drop. This often results from oversized valves, high circuit resistance, improper balancing, or pump control issues. Low authority leads to unstable control, hunting, and poor temperature regulation. Resolution 1. What Valve Authority Is Valve authority indicates what portion of the system’s total pressure drop occurs across the fully open control valve. Valve Authority (N) = ΔP valve / (ΔP system + ΔP valve ) Common design target: 0.2 to 0.5 for proportional control. Higher authority yields more stable and predictable modulation. 2. How to Improve Valve Authority A. Increase the Pressure Drop Across the Control Valve This is the most effective method. Select a valve with a smaller Cv (or higher kv) Smaller valves produce higher ΔP, improving authority. Oversizing is the most common cause of poor control. Use correctly sized PICVs or globe valves Select based on design flow and recommended ΔP. B. Reduce the Pressure Drop in the Rest of the Circuit High coil or piping resistance lowers valve authority. Reduce coil pressure drop (if feasible) Normally a design‑phase consideration. Rebalance or adjust regulating valves Over-throttled balancing valves increase system ΔP improperly. Remove unnecessary restrictions Clean strainers, check partially closed isolators, and fix fouled or incorrectly installed components. C. Improve Pump Control and Differential Pressure Management Set DP control points closer to the load Prevents excessive ΔP in remote sections of the system. Use variable speed pumping Stabilises ΔP across the valve and prevents wild swings. Verify correct DP sensor placement Incorrect placement forces pumps to generate unnecessary ΔP, reducing effective authority. D. Replace Traditional Valves with Pressure Independent Control Valves (PICVs) PICVs maintain predictable flow and required ΔP even as system pressure varies. Benefits: Stable control across all DP conditions Reduced sensitivity to pump behaviour Simplified commissioning E. Address Common System Issues That Reduce Effective Authority Blocked strainers Incorrect balancing valve positions Actuators not fully opening valves Wrong valve body installed Backwards coil or valve installation These issues distort pressure distribution and reduce available ΔP across the control valve. Summary Table Improvement Method Impact Notes Reduce valve Cv Increases ΔP across valve Most effective design fix Correct balancing Lowers system ΔP Common commissioning issue Optimise pump DP control Stabilises ΔP across valve Important in VAV / variable flow systems Use PICVs Normalises ΔP Best retrofit option Remove system restrictions Restores intended ΔP split Often found during troubleshooting

Issue How to calculate differential pressure across a fully open valve for a given flow rate. Product Line Field Devices Environment Hydronic water systems with modulating or two-position control valves operating fully open Valve sizing and selection workflows Calculations using Kvs or Cvs coefficients Typical units: L/s, m³/h, bar, kPa Cause Designers and service engineers often need to estimate the pressure drop across a specific valve at a known flow to validate pump head, confirm circuit balance, or compare alternatives. This requires correct use of the valve flow coefficient (Kvs or Cvs) and unit consistency. Resolution A. Formula and unit handling Identify the valve flow coefficient: Use Kvs if available. If only Cvs is provided, convert using: Kvs = Cvs × 1.03 Ensure flow is in the correct units: If flow is provided in L/s, convert to m³/h using: m³/h = L/s × 3.6 Calculate differential pressure across a fully open valve: ΔP in bar Convert pressure units if required: 1 bar = 100 kPa B. Worked example for 32 mm V211T (Kvs = 16) Two flows through a 32 mm V211T valve, fully open. Example 1 Given: Flow = 0.549 L/s, Kvs = 16 Convert flow: 0.549 × 3.6 = 1.9764 m³/h Compute: (1.9764÷16) 2  = 0.015258 bar Convert to kPa: 0.015258 × 100 = 1.526 kPa Example 2 Given: Flow = 0.483 L/s, Kvs = 16 Convert flow: 0.483 × 3.6 = 1.7388 m³/h Compute: (1.7388÷16) 2  = 0.0118102 bar Convert to kPa: 0.0118102 × 100 = 1.181 kPa C. Procedure checklist Confirm valve model and obtain Kvs from the technical data sheet. Convert the measured or design flow to m³/h if needed. Apply ΔP bar  = (m 3 /h ÷ Kvs) 2 . Convert the result to kPa if required. Validate that resulting valve pressure drop is consistent with available pump head and balancing strategy. D. Notes and good practice The calculation assumes the valve is fully open and water properties near standard conditions. For valves specified only in Cvs, use the conversion to Kvs before calculation. Recheck unit conversions to avoid squared errors in pressure results. For non-water fluids or unusual temperatures, consult the product data sheet or manufacturer guidance for correction factors.

Issue A Satchwell CZU4201 fan coil unit controller either: Remains stuck in cooling mode, or Does not respond correctly to user setpoint adjustments when a DRT3451, STR611, or STR612 remote adjuster is installed. Product Line Field Devices Environment CZU4201 Remote setpoint devices: DRT3451 STR611 STR612 Cause Two conditions may result in incorrect or unresponsive control: Internal setpoint not disabled When a remote setpoint device is installed, the CZU4201 internal setpoint potentiometer must be set to 10 °C. If not set to 10 °C, the controller prioritizes its internal setpoint instead of the remote device. Wiring differences between legacy DRT devices and newer STR devices DRT3451 and STR611/612 use different terminal mappings for: Combined sensor + setpoint devices Setpoint‑only devices paired with a separate temperature sensor Incorrect wiring will result in improper resistance values at the controller input, creating inaccurate sensing and control behavior. Resolution 1. Disable the internal setpoint when using a remote adjuster On the CZU4201 or CZU controller: Locate the internal setpoint potentiometer. Set the internal setpoint to 10 °C. This forces the controller to ignore the internal setpoint and use the remote adjuster. 2. Verify correct wiring based on device type DRT3451 Sensor + setpoint combined: Use terminals A and C Setpoint only (with separate sensor): Use terminals A and B, with the sensor wired in series STR611 / STR612 Sensor + setpoint combined: Use terminals 22 and 23 Setpoint only (with separate sensor): Use terminals 22 and 24, with the sensor wired in series CZU4201 Controller Temperature sensor input always connects to terminals 9 and 10 If using a remote setpoint adjuster, confirm the internal setpoint is set to 10 °C 3. Validate corrected operation Confirm the controller responds to changes in remote setpoint Verify normal switching between heating and cooling modes

Issue A VTRE valve actuator has a missing or broken manual override lever and a replacement part number is required. Product Line Field Devices Environment VTRE Valve and Actuator Cause The manual override handle has been damaged, lost, or broken due to installation, commissioning, or maintenance activities. Resolution The manual override handle for VTRE actuators is not available as an individual spare part. Additional key points: The VTRE valve range is obsolete, and individual hardware components, including the manual override handle, are no longer manufactured or sold separately. Replacement of the entire valve assembly is required if the manual override function is needed. When replacing obsolete VTRE valves, refer to Replacement Options for Obsolete VTRA and VTRE 3‑Port Valve Bodies

Issue Customer requested guidance on how to correctly mount an SHD2 humidity/temperature duct sensor after a steam humidifier, including recommended minimum distance to avoid condensation exposure. Product Line Field Devices Environment SENSORS - PLANT ROOM Cause The SHD2 sensor must be positioned far enough downstream of the steam injection point to ensure complete steam absorption and mixing. Incorrect placement may expose the sensor to condensation, which is outside its operating specification (0–95% RH, non‑condensing). Resolution Measurement accuracy and sensor lifespan require the SHD2 to be installed after the manufacturer‑specified steam absorption distance. The absorption distance depends on humidifier design and system variables such as airflow, duct size, and steam output. Follow these guidelines: Determine the required steam absorption distance from the humidifier manufacturer. Install the SHD2 only after this distance to ensure full steam absorption and mixing has occurred. Ensure the sensor is not exposed to condensation or droplets at any time. Avoid mounting the sensor too close to steam injectors or humidifiers, consistent with general recommendations also used for SH4/ST4 series sensors. Proper placement prevents condensation damage and ensures sensor performance.

Issue The fan on SE7300 or SE8000 room controllers does not turn off when the fan mode is set to Auto. Even after heating or cooling demand stops, the fan often continues to run at low speed. Product Line Field Devices Environment SE7000 series room controller SE8000 series room controller Cause The default fan operating mode keeps the fan running continuously during occupied periods unless Auto Demand is enabled. For SE8000 controllers, incorrect fan mode selection or improper integration binding can also prevent the fan from turning off. Resolution SE7300 Controllers Enter Configuration Mode. Refer to page 19 of the SE7300 Series Installation Guide. Locate the AutoFan parameter. AS (Default) Auto Speed during occupied periods Fan runs continuously AS AD (Required) Auto Speed / Auto Demand Medium and high speeds follow temperature offset Low speed runs only when demand exists and turns off when demand is zero SE8000 Controllers From the home screen, open the Fan Mode menu. Set fan mode to Smart. In Smart Mode, the fan automatically turns off when there is no heating or cooling demand. BMS Integrations When integrating with a BMS, ensure bindings to Occupancy Command are done at a priority level, not the Value field. Binding to the Value field forces the controller into a state where the fan may not turn off.

Issue Documentation is required for the SPP920 Differential Pressure Switch, including datasheet details, mechanical specifications, and installation instructions. Product Line Field Device Environment SPP920 Differential Pressure Switch. Cause Product details, specifications, and installation instructions are not included in standard Schneider Electric documentation, as the device originates from an external manufacturer. Resolution The SPP920 is a differential pressure switch designed for monitoring low‑pressure air and non‑combustible gas systems. Technical documents are available from the manufacturer and include datasheets, pressure range details, electrical characteristics, and installation guidelines. Mechanical Connections P1 – High Pressure: Connect to the discharge or positive pressure side P2 – Low Pressure: Connect to the suction or vacuum side Standard Product Features All SPP920 pressure range variants include: EPDM diaphragm suitable for HVAC air and gas applications Brass case assembly PG9 specification cover for cable entry IP65 environmental protection rating Type A mounting bracket for panel or surface installation Documentation Available Technical datasheet with pressure ranges, switching performance, set‑point details, and electrical ratings Installation instructions covering: Mounting orientation Tubing connections Adjustment of switching threshold Environmental considerations

Issue Satchwell ARE, ARX and ARM rotary actuators (Series 1, 2 and 7, identified by the first digit of the model number) are obsolete. Suitable Schneider Electric MD Series actuators must be selected based on model family, supply voltage, torque requirement, and installation type. Product Line Field Devices Environment Applies to Satchwell rotary actuators installed on: Air dampers Satchwell MB (screwed) rotary shoe valves Satchwell MBF (flanged) rotary shoe valves Affected actuator families and series: ARE1xxx, ARE2xxx, ARE7xxx ARX1xxx, ARX2xxx, ARX7xxx ARM1xxx, ARM2xxx, ARM7xxx ARMS7xxx spring‑return variants (e.g. 7602, 7603, 7604) Cause The Satchwell ARE, ARX and ARM rotary actuator families are obsolete and no longer supported. Schneider Electric MD Series actuators provide the approved replacements. Selection varies depending on torque, supply voltage, and whether the installation is a damper or MB/MBF valve application. Resolution 1. Recommended MD Series Replacement Summary ARE Series → MD20A‑24 (dampers/MBF) or MD10A‑24 (MB screwed valves) ARX Series → MD20B‑24 (dampers/MBF) or MD10B‑24 (MB screwed valves) ARM Series → MD20B‑230 (dampers/MBF) or MD10B‑230 (MB screwed valves) ARMS Series (spring‑return) ARMS7602 → MD10SR‑TS ARMS7603 → MD10SR‑T ARMS7604 → MD10SR‑TS Note: Series 1, 2 and 7 models follow the rule: first digit of the model number = series (e.g. ARE1xxx = Series 1). 2. Cross‑Reference Table: Satchwell → MD Series ARE to MD Series Original Models MD Replacement Part Number ARE1301, ARE1302, ARE2301, ARE2302, ARE2303, ARE2304, ARE2351, ARE7301, ARE7303 MD20A‑24 8751029000 ARE2352, ARE2354, ARE2355 MD10A‑24 8751019000 ARX to MD Series Original Models MD Replacement Part Number ARX1201, ARX1202, ARX2201, ARX2202, ARX2203, ARX7201 MD20B‑24 8751025000 ARX2251, ARX2252, ARX2253 MD10B‑24 8751015000 ARM to MD Series Original Models MD Replacement Part Number ARM1601, ARM1602, ARM2601, ARM2605, ARM2606, ARM2607, ARM2651, ARM2656, ARM2657, ARM7601 MD20B‑230 8751021000 3. Installation Type and Required Linkage Hardware Air Dampers (Direct Mount) Satchwell Model MD Replacement Notes ARE Series MD20A‑24 Includes damper mounting kit ARM Series MD20B‑230 Includes damper mounting kit ARX Series MD20B‑24 Includes damper mounting kit Remote damper linkage (if required): ZG‑MD20 (9141063000) MB (Screwed) Valve Installations Satchwell Series MD Replacement Linkage Kit ARE MD10A‑24 9141071000 ARM MD10B‑230 9141071000 ARX MD10B‑24 9141071000 MBF (Flanged) Valve Installations Satchwell Series MD Replacement Linkage Kit ARE MD20A‑24 9141070000 ARM MD20B‑230 9141070000 ARX MD20B‑24 9141070000 4. Auxiliary Switch Options Supported for ARE / ARX / ARM Not supported for ARMS (spring‑return) Option Part Number MD‑S1 (single switch) 9141060000 MD‑S2 (dual switches) 9141061000 5. Wiring Conversion Summary Non‑spring return (ARE / ARX / ARM) ARE → MD20A‑24: 2→2, 3→3, 1→1, 5→5 ARX → MD20B‑24: 3→3, 2→2, 1→1 ARM → MD20B‑230: 3→3, 2→2, 1→1, Earth not required Spring‑return (ARMS Series) ARMS7602 → MD10SR‑TS: Term 3 → Blue (G) Term 1 → Brown (GO) Term 2 → isolate/make safe Earth not required ARMS7603/7604 → MD10SR‑T/TS: Wire 2 → Blue (G) Wire 1 → Brown (GO) 6. Final Recommendations Verify actuator availability using the latest Schneider Electric valves and actuators catalogue Add MD‑S1 or MD‑S2 if auxiliary indication is required (non‑ARMS only) For unusual mechanical configurations, consider ZG‑MD20 or consult regional technical support

Issue How to wire a Schneider Electric Forta actuator configured for Increase/Decrease control to early discrete Satchwell Climatronic CSC/CXR/CXT controllers during replacement of obsolete actuators. Product Line Field Devices Environment Building automation retrofit scenarios replacing legacy Satchwell actuators 24 V control wiring with Increase/Decrease (floating) commands Early discrete CSC/CXR/CXT controller outputs driving valve actuators Cause Legacy Satchwell Increase/Decrease actuators have become obsolete. When replaced with a Forta actuator, the wiring convention differs from Forta’s standard datasheet examples, necessitating a specific connection method for early discrete controllers Resolution 1) Use the required wiring orientation for early discrete controllers For early discrete CSC/CXR/CXT, wire the Forta actuator using: 24 V OPEN / 24 V CLOSE / 0 V COMMON (instead of the usual 0 V OPEN / 0 V CLOSE / 24 V COMMON shown in some Forta literature). 2) Configure the actuator Set DIL (DIP) switch 2 = ON to enable Increase/Decrease (floating) mode. 3) Make a four‑wire connection to the Forta terminals G = 24 V supply G0 = 0 V supply (common) VH = 24 V OPEN command VC = 24 V CLOSE command 4) Critical installation notes Maintain a continuous 24 V across G–G0 for proper operation. Ensure the controller and actuator share the same 0 V reference. Verify the 24 V power source has sufficient VA capacity for a Forta actuator, which typically exceeds that of some legacy Satchwell actuators. Applicability Applies to: Early discrete Satchwell CSC/CXR/CXT controllers only (the wiring deviation originates from this legacy output scheme). Does not generally apply to later models: Later CSC52xx/53xx and CXT variants use updated electronics and standard 24 V actuator interfaces; wiring deviations are typically not required. The common retrofit constraint on later CXT is VA capacity, for which an external transformer may be needed—not altered command wiring. Reference product documentation for CSC52xx/53xx capabilities and outputs: CSC 5252/5352 user manuals/specifications.

Issue Clarifying correct linkage kit selection when replacing Satchwell AL-series actuators with Schneider Electric Forta, MV15B, or SpaceLogic actuators on Satchwell Plug and Seat valve bodies. Product Line Field Devices Environment Satchwell: 1-series 2-port and 3-port 2-series 2-port and 3-port 3-series 2-port and 3-port 7-series 2-port and 3-port Schneider Electric actuators used for retrofit: Forta MV15B (1500 N) SpaceLogic M400/M800/M1500 SpaceLogic M700 Cause Satchwell valve bodies use different neck thread specifications depending on series. The L2SV and L7SV kits are designed for specific Satchwell thread geometries and do not fit all models. Actuators such as Forta and MV15B require the correct mechanical interface to ensure proper stroke, thrust transfer, and valve stem alignment. Resolution Use L2SV or L7SV linkage kits only on Satchwell Series 1, 2, and 3 plug and seat valves. These kits are not compatible with Satchwell Series 7 plug and seat valves due to differing thread specifications. For Series 7, only Forta actuators can be used via linkage kit 880–0135–000; no MV15B linkage option is available. 1. Determine Satchwell Valve Series Check the valve body specification number stamped on the identification collar. The middle digit indicates the series (e.g., 626–7–402 → Series 7). 2. Linkage Kit Compatibility Summary ✔ Compatible With Satchwell Series 1, 2, 3 S-E L2SV (8800124000) S-E L7SV (8800126000) Both kits thread correctly onto Series 1/2/3 valve body necks. These valve bodies share a compatible thread form enabling direct mounting. Supported actuators via these kits: Forta linear actuators MV15B (via L7SV only) SpaceLogic M400, M800, M1500, M700 actuators 3. NOT Compatible With Satchwell Series 7 Neither L2SV nor L7SV will mount to Series 7 (MZ/MZF, VZ/VZF) valve bodies. Series 7 uses a different neck thread that cannot engage with the adaptors supplied in these kits 4. Correct Linkage for Satchwell Series 7 To mount a Forta actuator to Series 7: Use linkage kit 8800135000 For MV15B: No compatible linkage kit exists for Series 7 5. Additional Compatibility Notes Thread Standards & Adapters Satchwell-related linkage kits use M30 × 1.5 threaded bonnet interfaces. This applies to: L2SV (8800124000) L7SV (8800126000) Other Satchwell/Controlli/Spirax adapters Actuator Compatibility MV15B actuator supports: L7SV linkage (8800126000) for Satchwell VZ/MZ valves Other kits (e.g., Spirax Sarco M30 × 1.5, TAC/Siebe, Honeywell) – not applicable to Satchwell Plug & Seat valves SpaceLogic M700, M400, M800, M1500 actuators: Work with L2SV/L7SV on compatible Satchwell valves Resolution Summary Table Satchwell Valve Series Compatible? Required Linkage Kit Actuator Support Series 1 Yes L2SV or L7SV Forta, MV15B*, M400/M700/M800/M1500 Series 2 Yes L2SV or L7SV Same as above Series 3 Yes L2SV or L7SV Same as above Series 7 No Use 880–0135–000 (Forta only) MV15B not supported *MV15B only supported through L7SV where valve body is Satchwell VZ/MZ

Issue Identify correct and supported replacement actuators and linkage configurations for legacy VTRA and VTRE rotary valve installations where original actuators are obsolete or failed. Product Line Field Devices Environment Legacy rotary valves: VTRA, VTRE Installed base scenarios: VTRE with M9B or EM9 electronic actuators VTRA with legacy actuators such as M15 and EM42 VTRA replacements requiring mains powered 230 Vac actuators Typical actuator requirements: Travel: 90 degrees for VTRE rotary shoe valves Travel: 180 degrees for some VTRA use cases Control: 3-point floating or modulating (0–10 V, 2–10 V, 0–20 mA, 4–20 mA) Supply: 24 Vac or 230 Vac as per site wiring Cause Original actuators are obsolete or no longer available. Failed actuators on legacy VTRA or VTRE installations require compatible replacements that match mechanical travel, control signal type, power supply, and valve interface. VTRE valves require strict 90 degree travel for correct shoe porting and must not be driven over-travel. Resolution 1) VTRE rotary shoe valves Supported replacement actuators Use actuators that provide correct 90 degree working range and align with control and power requirements: Part number Model Control signal Working range 90 degree running time Supply 8601010000 M9B/24 3-point 30–180 degrees 90 degrees in 4 min 24 Vac 8601020000 M9B/230 3-point 30–180 degrees 90 degrees in 4 min 230 Vac 8601110000 EM9/90/180 Modulating 1 90 or 180 degrees 60/90/120 s at 90 degrees 2 24 Vac 1 Selectable input: 0–10 V, 2–10 V, 0–20 mA, 4–20 mA 2 At 180-degree configuration, typical times are 120/180/240 s Selection and setup guidance VTRE requires 90 degree travel for correct operation. Configure EM9/90/180 to 90 degree mode before commissioning. Select M9B (3-point) or EM9 (modulating) based on the existing control signal and site wiring. No additional linkage kits are required when mounting these actuators on VTRE valves. VTRE valve bodies are discontinued. This guidance covers actuator replacement only. For full valve and actuator replacement, evaluate current generation Schneider rotary valve platforms. 2) VTRA rotary valves 2.1 Replacement for obsolete EM42 on VTRA Replace EM42 with EM9 180 degrees (8601110000). Use VTRA linkage kit 8600990000. Do not use the generic linkage kit that ships with the EM9. Use the VTRA specific linkage. 2.2 Replacement for obsolete M15 on VTRA Replace M15 with EM9 180 degrees (8601110000). Use VTRA linkage kit 8600990000. 2.3 Mains powered replacement on VTRA (230 Vac) Use M9B-230 actuator (8601020000). Use VTRA linkage kit 8600990000. Both actuator and linkage must be updated together to ensure mechanical compatibility. VTRA quick reference Legacy scenario Replacement actuator Notes EM42 obsolete EM9 90/180 degrees (8601110000) Requires VTRA linkage kit 8600990000. Do not use the EM9 bundled linkage. M15 on VTRA EM9 90/180 degrees (8601110000) Requires VTRA linkage kit 8600990000 Mains 230 Vac requirement M9B-230 (8601020000) Requires VTRA linkage kit 8600990000 3) Part number normalization and notes Some references may appear with hyphenated formatting. Use these normalized codes for ordering and documentation: 8601010000 M9B/24 8601020000 M9B/230 8601110000 EM9/90/180 8600990000 Linkage kit E/M9-VTRA 4) Commissioning checklist Confirm valve type first: VTRE requires 90 degree travel, VTRA often uses 180 degree travel in legacy applications. Match control method: 3-point sites use M9B variants. Modulating sites use EM9 variants. Select proper input range (voltage or current). Match power supply: 24 Vac or 230 Vac. Mounting: VTRE: no extra linkage required for listed actuators. VTRA: always use VTRA linkage kit 8600990000 with EM9 or M9B-230. Disable or remove any non VTRA specific linkage that may come bundled with new actuators when installing on VTRA. Set mechanical stops and stroke configuration to the required travel before applying control signals. Function test across full travel at low speed to verify end positions and port alignment.

Issue How to source a suitable replacement battery for the CSC5352 (and CSC5252) Climatronic Compensator controller. Product Line Field Devices Environment Wall‑mounted CSC5352 Compensator Wall‑mounted CSC5252 Compensator  Cause Internal lithium cell has reached end of life. Resolution The replacement battery for CSC5352 and CSC5252 is: Battery Type: LS14500 lithium‑thionyl chloride cell RS Components Order Number: 201‑9438 Basic Battery Specifications (Useful for verifying compatibility or sourcing alternatives) Chemistry: Lithium‑Thionyl Chloride (Li‑SOCl₂) Nominal Voltage: 3.6 V Open Circuit Voltage: 3.67 V at +20°C  Nominal Capacity: 2.6 Ah  Operating Temperature Range: –60°C to +85°C Dimensions: Diameter: 14.55–14.62 mm Height: 50.28–50.30 mm Weight: ~16.7–17 g  Lithium Metal Content: ~0.7 g Self‑discharge Rate: <1% per year at +20°C (excellent long‑life cell)  These characteristics match the original battery installed in CSC5352/CSC5252 units. The LS14500 is widely used in long‑life industrial and metering applications and is the correct form factor for the controller.

Issue The Schneider Electric Forta M700 actuator cannot be mounted onto the VGS211F valve body. Product Line Field Devices Environment Forta M700 actuator installed or being installed on a VGS211F valve body. Cause The VGS211F valve body spindle adaptor is missing. This adaptor is required to mechanically connect the M700 actuator to the valve spindle. Without the adaptor, the actuator cannot be mounted. Resolution Install the VGS211F valve body spindle adaptor before mounting the Forta M700 actuator. The VGS211F valve body is supplied with this adaptor. The required adaptor and assembly method are shown in the Forta M700 Installation Instructions. Ensure the spindle adaptor is fitted correctly to allow proper mechanical connection between actuator and valve body.

Issue The MD20 Actuator Drive Shaft Clip makes contact with the cut‑out in the LMD/AR‑MBF Linkage Kit Mounting Platform, restricting the clip from rotating freely. Product Line Field Devices Environment MD20 Actuator installed on Satchwell MBF valve body using the LMD/AR‑MBF mounting platform Cause The diameter of the Drive Shaft Clip cut‑out on the MD20 Actuator or the LMD/AR‑MBF Linkage Kit Mounting Platform may be undersized. The original (pre‑Aug 2007) LMD/AR‑MBF mounting platform had a smaller cut‑out diameter, which can impede free rotation of the MD20 Drive Shaft Clip. If the MD20 Actuator Drive Shaft Clip cut‑out is manufactured below specification, fouling can also occur. Resolution Measure the diameter of the cut‑out MD20 Drive Shaft Clip cut‑out must be 47 mm. LMD/AR‑MBF mounting platform cut‑out must also be 47 mm. Identify platform version Cut-out < 47 mm indicates the older linkage platform design (pre‑August 2007). This version can foul the Drive Shaft Clip. Corrective actions Replace the MD20 Drive Shaft Clip if its cut‑out diameter is < 47 mm. If using an older LMD/AR‑MBF mounting platform, upgrade to the post‑August 2007 version with the enlarged 47 mm cut‑out. Operational note Even if the clip cannot rotate freely, the MD20 actuator drive shaft itself remains engaged and its rotation is not impeded.

Issue How to convert a Satchwell MB series 3‑port Rotary Shoe Valve Body for use as a 2‑port Zone Valve in HVAC applications, and whether it will work effectively once converted. Product Line Field Devices Environment HVAC heating or cooling systems requiring a 2‑port Zone Valve Pipework connection sizes greater than 3/4 inch BSP Sites where an existing 3‑port valve body must be adapted to function as a 2‑port valve Cause A 2‑port Zone Valve Body is required but only a 3‑port Satchwell MB series Rotary Shoe Valve Body is available. Existing installations originally used a 3‑port Valve Body and replacement with a native 2‑port model is not feasible due to time, pipe sizing, or system constraints. Resolution Conversion steps Install a plumber’s plug into Port 3 of the MB series 3‑port Rotary Shoe Valve Body. Tighten the plug sufficiently to maintain the valve body’s PN10 pressure rating. Leak test after installation to confirm sealing integrity at expected differential pressures. Effectiveness summary An MB series 3‑port Rotary Shoe Valve will generally work effectively as a 2‑port valve when Port 3 is correctly plugged. The rotary shoe mechanism does not rely on an axial plug and seat, so blocking Port 3 does not interfere with the shoe, spindle travel, or actuator operation. For typical zone control in heating and cooling circuits, this method is a widely used and accepted field practice. Performance considerations Aspect Expected behavior when converted Flow coefficient (Kv) May differ slightly from a native 2‑port body due to internal geometry. Recheck valve authority if the circuit is tightly engineered. Valve authority Usually acceptable for zone control. Validate if using precise differential pressure control or where pipework losses are low. Close‑off and leakage Comparable to standard MB operation when installed and plugged correctly. Verify against site DP. Stroke and actuator behavior Unchanged. Use the same actuator travel and sequencing as the original MB 3‑port installation. Pressure rating PN10 must be preserved. Ensure the plumber’s plug is tightened and suitable for the medium, temperature, and pressure. Important notes and exceptions This conversion guidance applies to Rotary Shoe valves such as the Satchwell MB series. Use only dish‑nosed or hollow‑ended plumber’s plugs in Port 3 to avoid fouling the internal rotary shoe. Where compliance specifications or very tight close‑off and authority requirements exist, prefer a dedicated 2‑port valve body.