Issue S-E L2SV Linkage Kit and S-E L7SV Linkage Kit compatibility with Satchwell Plug and Seat Valve Bodies. Environment Satchwell 1 series Plug and Seat 2-port and 3-port Valve Bodies. Satchwell 2 series Plug and Seat 2-port and 3-port Valve Bodies. Satchwell 3 series Plug and Seat 2-port and 3-port Valve Bodies. Satchwell 7 series Plug and Seat 2-port and 3-port Valve Bodies. Cause Use the correct S-E Linkage Kit with Satchwell Plug and Seat Valve bodies. Resolution 1.  Observe specification number of Satchwell Plug and Seat Valve Body Generally where a Satchwell AL series Linear Actuator is fitted to a Satchwell plug and seat Valve Body, the Actuator may be replaced by an equivalent S-E Forta or MV15B series Linear Actuator and appropriate S-E Linkage Kit. It should be noted however that neither the S-E L2SV Linkage Kit nor the S-E L7SV Linkage Kit will enable an S-E Forta or MV15B series Linear Actuator to be mounted on a Satchwell 7 series MZ/MZF or a Satchwell 7 series VZ/VZF plug and seat Valve Body. The internal screw threads of the Neck Adaptors included in the S-E L2SV Linkage Kit (880 – 0124 – 000) and S-E L7SV (880 – 0126 - 000) Linkage Kit are compatible with the external screw threads on Satchwell 1, 2 & 3 series Valve Body necks only. The external screw threads on Satchwell 7 series Valve Body necks however differ to those on Satchwell 1, 2 & 3 series Valve Body necks. Consequently neither the S-E L2SV Linkage Kit nor the S-E L7SV Linkage Kit will enable an S-E Forta or MV15B series Linear Actuator to be mounted on a Satchwell 7 series Valve Body. A S-E Forta series Linear Actuator may be mounted on a Satchwell 7 series Valve Body however using Linkage Kit 880 – 0135 – 000.  No equivalent Linkage Kit is currently available for use with the MV15B series Linear Actuator. The Satchwell Valve Body series may be determined from the Valve Body specification number stamped on the Valve Body Identification Collar, where the single middle digit of the specification number denotes the series. In the case of a Satchwell 7 series Valve Body for instance the single middle digit of the specification number will be the number 7 (e.g. 626 – 7 – 402)

Issue Tested the Viconics VT7600x1000x for Cool CPH set to 3.  Manually heated the thermostat and let it cool to cycle the cool stages and it cycled on and off 7 times before stopping the test.  According to the documentation it should have stopped after 3 on/off cycles. Product Line Field Devices Environment SSL SE7000 Cause Cooling/heating has to be within 15-85% of the proportional band. Resolution With the Viconics VT7600x1000x series products, the CPH only works when the cooling/heating demand is within 15 to 85% of the proportional band. The thermostat has a 2 degree proportional band (fixed) so at a setpoint of 72 and CPH of 3 (cooling CPH adjustable 3-4), if the temperature stays between 72.3 and 73.7 the CPH is at 3. Outside of that band the cooling/heating is allowed to cycle as often as needed.

Issue How to be redundant with your intelligent Building Management System (iBMS) Product Line Andover Continuum,EcoStruxure Building Operation,Field Devices,Other,Satchwell Sigma,Security Expert,TAC INET Environment Existing intelligent Building Management System Open Mind High Avalibility Solutions everRun MX Cause In engineering, redundancy is the duplication of critical components of a system with the intention of increasing reliability of the system. To be redundant with an intelligent Building Management System (iBMS) would take on two possibilities. 1. Have an alarm on critical points alerting personnel who move into action quickly replacing control boards or devices in the event of failure. 2. Have secondary backup controllers which upon failure, which are used to control devices resuming functionality. This is accomplished through programming the BAS with event sequences triggered from alarms or flags noting the failure. Redundancy capabilities and feasibility is site specific. Ascertaining failure in boards, points, or devices is crucial to creating secondary measure to keep seamless processes going and resume with functions.   Error detection and correction with maintenance is often the best practice for preventing failure. Worn components is the leading cause of failure, followed by lack of planning and consideration in the protection of electrical components through power surges or failures.   For the database, backups including automated backups for MSDE, SQL Express, and Full SQL are available. For further information on database backups and options, take a look at Microsoft SQL Management Studio. For Host Computer backups, look at adding a secondary computer which replicates the database and can capture transactions and messages should a failure with the primary host computer take place. Also work with the local IT department to keep machines up to date, safe, and clean of 3rd party applications which may interfere with integrity.   Schneider Electric’s building management systems are designed such that building control continues even when controller to server communication is disrupted. The BMS server is home to a database of alarm and historical data, as well as system parameters and programs. When a server or its network connection fails, the collection of data from building controllers halts until the problem is resolved. For data critical applications, this solution provides an environment capable of preventing the data loss that results from these types of failures.  Although we do support its use with StruxureWare Building Operation, Security Expert, Continuum, I/NET, Vista, Sigma, and I/A Series as a disaster recovery solution, we do not provide direct support for EverRun. Resolution For Open Mind High Availability Solutions guide please look at the following link; Open Mind High Availability Solution guide For everRun MX solution guide please look at the following link; everRun MX guide  

Issue Temperature Sensor Resistance Charts Product Line Andover Continuum, EcoStruxure Building Operation, Field Devices, Satchwell MicroNet, Satchwell Sigma, TAC IA Series, TAC INET, TAC Vista Environment Temperature Sensors Cause Temperature (°C) to Resistance Charts (ohms). Upgrading the site BMS, but retaining the existing sensors and the sensor resistance values are not known. Resolution The resistance of a sensor at a specific temperature can be downloaded below, there are a number of tables collated from different sources for a number of Schneider Electric sensors and other BMS suppliers.   In EBO, the thermistor selection in the IO module or controller does not represent the thermistor bead type, an example is the Continuum Type I in EBO, but the bead is a Type 3,. For further information regarding this see the KB article  Thermistor type selection in EBO.   The document All Sensors covers the following:   Satchwell T range is now known as STR600, STP660, STD600, STO600 10K3A1 with shunt Drayton DC1000, DC1100 30K6A1 is now known as STR600D, STP600D, STO600D Andover 10K4A1 TAC Inc. Vista 1.8KA1 I/A series 10K3A1 with 11K shunt INET 10K2A1 (10k Dale) BALCO 1000 ohm RTD   Older Satchwell ranges: Satchwell DW1204, DW1305, DWS1202 Satchwell DO Satchwell DD/DR Other manufacturers included: Allerton 3K3A1 Ambiflex 2012, Honeywell Aquatrol, Jel/Thorn, Trend, York 10K3A1 Schlumberger (air) 5K3A1 Schlumberger (immersion) 100K6A1 Automatrix, York, Sibe 10K4A1 Honeywell 20K6A Landis & Gyr PT100A, PT1000A   Further information regarding the INET, IA and Balco, the document Thermistor Types Tables (Veris Industries) is available.   Further information for the Continuum ACC Temp 10K Type 3 also known as 10K4A1, the document Thermistor Temp Resist Chart (Precon Thermistors) is available.   TC900 series TC900 RS-03 sensor chart   For I/A Series Controllers (MNL/MNB) Compatible sensors that have a built-in 11k shunt resistor include the TS-5711-850 TS-57011-850 TS-57031-850 TSMN-90110-850 Series Any sensor that matches resistance to temperature curve for a 10K Thermistor Type G (U.S. Sensor), Type 9 (Dale/Vishay) or Type III (ACI Series AH) can be used with the I/A Series MNL and I/A Series MNB series controllers, provided that a 11k ± 0.1% 1/8 watt resistor is wired in parallel with the sensor. The input has a range of -10 to 135 °F (-23.3 to 57.2 °C) with an accuracy of ±1% of span. Temperature / Resistance Reference Values Temperature Deg F (Deg C) Resistance Resistance Incl. 11k Shunt 32 (0) 25490 8,012 68 (20) 12,260 5,798 75 (25) 10,000 5,238 104 (40) 5,592 3,707 140 (60) 2,760 2,206 The full temperature/resistance table for the US Sensor 10K Thermistor R-T Curve Type G sensor. Please note that the controller may not be able to use the full temperature range shown in the table.  

Issue CSC4201 CSC4202 CSC4301 CSC4302 Climatronic Compensator Controller display flashing. Environment Satchwell CSC4201 CSC4202 CSC4301 CSC4302 Climatronic Compensator Controller Cause Manual Override Switch is set in a mode other than AUTO (Clock symbol) Resolution Reset Manual Override Switch to AUTO (Clock symbol) mode. N.B. Details of this and other Manual Override Switch mode options and associated selection / de-selection may be found in the CSC4201 CSC4202 CSC4301 CSC4302 Climatronic Compensator Data Sheet, a copy of which may be viewed here.

Warning Hazard of Electric Shock: Remove all power from all devices before removing any covers or doors of the system. Disconnect power at the device and at the power source. Issue Need to replace an AVUE, AVUX or AVUM Mark 5 Actuator Product Line Field Devices Environment AVUE5305 AVUE5355 AVUE5304 AVUE5354 AVUX5202 AVUM5601 Cause Need to find a replacement for the obsolete AVUE, AVUX or AVUM Mark 5 actuator, that will allow the valve to be retained. Resolution The AVU* Mark 5 range of actuators can be replaced from the MZ300S range. AVUE5305 replace with MZ300S-24M AVUE5355 replace with MZ300S-24M AVUE5304 replace with MZ300S-24M AVUE5354 replace with MZ300S-24M AVUX5202 replace with MZ300S-24F AVUM5601 replace with MZ300S-230F The AVUE, AVUX, AVUM Mk 5 Datasheet is attached   MZ300S Specification sheet   MZ300S-24M Installation Instructions MZ300S-24F Installation Instructions   MZ300S-230F Installation Instructions

Issue SpaceLogic SLA CO2 units prior to date code 2138 cannot be field calibrated and ABC (Auto Baseline Calibration) is not set to ON by default. Product Line Field Devices Environment Veris Models – Cost Down version: CWE2, CWE2C, CWE2D, CWE2H, CWE2K, CWE2M, CWE2N, CWV2 Firmware prior to REV1.05.23 Prior to 2138 DC   Schneider Electric + Veris Models: CW2LA2A, CW2LA2AV, CW2LAXA, CW2LAXAV SLABLC2, SLABLCV2, SLABLCVX, SLABLCX, SLASLC2, SLASLCV2, SLASLCVX, SLASLCX, SLAWLC2, SLAWLCV2, SLAWLCVX, SLAWLCX Firmware prior to REV2.08.41 Prior to 2138 DC Cause The CO2 sensors are calibrated during manufacture, but can develop an offset during shipment or storage. Units cannot be field calibrated other than by the Auto Baseline Calibration (ABC) algorithm.  The offsets can be greater than 200PPM.  The ABC only calibrates at 30PPM a week.  That would require wait times of greater than 6 weeks. Resolution Replace with a unit with a date code of 2138 or higher or make sure ABC is enabled and wait the necessary time for ABC to correct.

Issue Current rating of the analogue outputs is not documented Product Line Field Devices Environment TC907-3A4LAB TC907-3A4LMAB TC907-3A4DLSAB TC907-3A4DLMSAB TC907-4FMSAB TC907-3A4DPSAB TC907-3A4DPMSAB TC907-3A4DPMSA-24B TC907-4FMSA TC907-3A4LMA TC907-3A4LA TC907-3A4DPSA TC907-3A4DPMSA-24 TC907-3A4DPMSA TC907-3A4DLSA TC907-3A4DLMSA Cause The maximum current information is required for connecting controlled devices. Resolution The analogue output has a maximum output of 40mA (minimum impedance 250Ω).

Issue Checking if a port is open Product Line Andover Continuum, EcoStruxure Building Expert, EcoStruxure Building Operation, Field Devices, Pelco, Satchwell MicroNet, Satchwell Sigma, TAC IA Series, TAC INET, TAC Vista Environment TCP/IP Communication Command Prompt Telnet Command Cause Suspect certain network ports are blocked and need to verify Resolution It is possible to check if a port is open in a network by issuing the Telnet command. Note:- Telnet operates using the TCP protocol. UDP connectivity cannot be tested using Telnet. If a port is open, a blank screen will be seen after issuing the command: telnet [domainname or ip] [port] where [domainname or ip] is the domain name or IP address of the server being checked [port] is the port number the server application is listening on For example: telnet 192.168.0.20 9001 (to a closed port would display a connect failed message)   telnet 192.168.0.20 9003 (to an open port would display a blank screen)   To exit the Telnet session, type Ctrl + ] and then type "quit".   For how to enable Telnet in Windows 7 please see Enable Telnet Client on a Windows 7 PC

Issue What is the unit load of the SpaceLogic SLP Room Units that will help me to calculate how many SLP Room Units that can be added on ComA and ComB of a SmartX Server. Product Line EcoStruxure Building Operation, Field Devices Environment SpaceLogic SLP Room Unit SmartX Server Cause Documentation does not state the Unit Load (UL) of the SpaceLogic SLP Room Unit. Resolution The Generic application note AN01 can be applied with answers to the transceiver interface attributes below. The SpaceLogic SLP Room Unit range use the SN65HVD1781DR transceivers which are a failsafe transceiver (not requiring bias) and reduced 1/10 UL. In addition there are no local bias resistors and therefore the 1/10 UL of the transceiver would be the total UL presented to the bus by the SpaceLogic SLP Room Unit. Transceiver Xcvr Unit Load Xcvr Failsafe Adaptor Circuit Bias Circuit Bias Load Total Unit Load Isolated 485 Bus SN65HVD1781DR 0.1 Yes None None 0.1 No Based on the above the total number of devices can be calculated as 32/0.1 = 320. The BACnet MSTP standard specifies that the address range for BACnet master devices is 0-127 and therefore a SmartX Server is limited to 127 devices per com port (254 total per Server) so this should effectively be the limiting factor. Since the SpaceLogic SLP Room Unit does not have an isolated RS-485 interface it conforms to Generic RS-485 Network Device Configuration 1 in EBO Webhelp.  A network consisting of only SpaceLogic SLP Room Units should only require a 120 ohm termination resistor at each end of the bus and not require any bias resistors. Also check out the SmartStruxure-RS485-Controller Unit Load Quick-Help video on the Exchange.

Issue TC3XX thermostat is off when power is restored after a power loss Product Line Field Devices Environment TC300 TC303 TC353 Cause The default operation mode when the TC3xx thermostat is powered up is in OFF mode. Resolution An internal system setting (parameter 03) allows the possibility to alter the behaviour of the thermostat upon power restoration. 00 = Restores with previous status  01 = Restores with power off.  (this is the factory default setting) 02 = Restores with power on. Once power is restored, the thermostat will remember all parameters (** with the exception of the TC303-3A2DPMS and TC303-3AADPMS) that were in place before the power failure. The following specification numbers allow the thermostat’s restored state to be configured: - TC303-3A2L TC303-3A4L TC303-3A2DLS * TC353-3A2DLS TC303-3A4 * TC353-3A2L TC303-3A2DLMS * TC353-3A4DLS TC303-3A2LM * TC353-3A4L TC303-3A4DLMS ** TC303-3A2DPMS       ** TC303-3A4DPMS For guidance and instruction on how to perform the adjustment of internal system parameters, please contact your local/regional support team. * The TC353-3A2L, TC353-3A4L, TC353-3A2DLS and TC353-3A4DLS have been discontinued. Refer to PA-00686 - Product ObsolescenceNoticefor EMEA and APAC for further details. ** The TC303-3A2DPMS and TC303-3A4DPMS temperature set point will revert back to the default value after power is restored. This is as per designed. Please note: internal system parameters MUST ONLY be changed by a trained Schneider Electric or an approved Partner technician.Incorrect setting of such internal system parameters may result in either undesired operation of the thermostat or irreversible damage.

Issue The documentation on The Exchange differs from the documentation included in the packaging. Neither document shows the full capabilities or wiring options of the transmitter. Environment STO300 Cause The supplier recently changed the PCB and as a result, all of the 300 model plantroom type sensors now offer dual outputs (current and voltage). Since the part number designation is for current only the documentation included in the packaging only shows this configuration. To further complicate matters the specification and installation materials on The Exchange have not been updated to reflect the changes at this time Resolution The installation instructions included in the product packaging should always be referred to when installing these transmitters. The latest installation instructions can be downloaded here. If the new 0-10VDC output feature is required please follow the diagram below for wiring and DIP switch configuration.

Issue When an SLR320 light level sensor has power applied a transient voltage (approx. 17VDC) is seen on the output. Environment SLR320 Cause In order to provide dual output capability (voltage and current) with both AC and DC supply, it is necessary to use a capacitor to filter the AC supply. This capacitor is also active in current mode because it is placed behind the rectifier at the G clamp. An additional resistance is added inside to minimize this load current. This load current of the capacitor (which is the cause of transient voltage) cannot be reduced to zero, otherwise the voltage output cannot be used at AC supply within its specification (max. output voltage @ min. load resistance @ min. supply voltage, Y clamp). Resolution This behavior is expected and by design. The transient voltage generated by the load current is settled within approximately 40ms and occurs only at power up. The transmitter is continuously powered so this would not normally be an issue and would have stabilized before a controller that was powered up at the same time would be booted and scanning it's inputs.

Issue Enabling TAC Xenta controller service menu Product Line Field Devices Environment TAC Xenta OP TAC Menta Cause To enable the TAC Xenta controller service menu, which is accessible from the OP, this option must be selected when the OP tree is edited/generated. Resolution Edit the OP tree in the OP configuration tool, and select Formats > Settings and "Use Service Menu" option will be available. When this option is selected the OP will be able to view the TAC Xenta device system program version, device name, and network address. In addition to that the OP will also be able to configure the I/O modules and restart the device.

Issue The calectro smoke detektor has too long pipe to fit Environment Calectro Smoke detektor Venturi pipe Cause The Venturi pipe is long, but also possible to cut Resolution You can cut the Venturi pipe to size but you must only cut it from the end that does not have the sleeve. See Installation instruction for more information.  

Issue BACnet/MSTP communication to Viconics VT thermostats is intermittent. Product Line Field Devices Environment SE7000 Room Controller Cause Possible cause is physical layer and device addresses. Resolution Verify the physical layer (i.e. wire, end of line resistors and bias resisters) is installed as recommended.  A common wiring error is landing the trunk cable shield to the "REF" terminal at the thermostat. The shield should be carried through but not landed at the thermostat and the trunk shield should be grounded in one place. Duplicate device addresses can cause this type of issue as well. Verify each controller has a unique "Com addr" which is part of its instance number. This can be viewed and modified from the display panel of the thermostat. To enter the configuration parameter menu: VT7200 series press and hold the button(OVERRIDE) for 8 seconds VT7300 series press and hold the middle button(°C/F or OVERRIDE)for 8 seconds. VT7600 series press and hold the button(MENU)for 8 seconds

Issue Satchwell “AL..S” series Spring Return Linear Actuator requires replacement Product Line Field Devices Environment Satchwell “AL..S” series Spring Return Linear Actuator installed on Satchwell MJF, MZ, MZF, VJF, VSF, VZ or VZF series Plug and Seat Valve Body. Actuator type :- AL..S series. Cause Obsolescence of Satchwell AL..S series Spring Return Linear Actuator. Resolution Replace Satchwell AL..S series Spring Return Linear Actuator with S-E M700 Spring Return Linear Actuator and Linkage Kit : AL..S = M700 + L7SV (880-0126-000) Linkage Kit. N.B. M700 is available with two different spring return actions M700 - SRSU (880-0430-000) = Spring Return Spring Up          ( M700 - SRSU will CLOSE a Satchwell Valve.) M700 - SRSD (880-0440-000) = Spring Return Spring Down     ( M700 - SRSD will OPEN a Satchwell Valve.) Should the Satchwell AL..S series Actuator include a wired Auxiliary Switch then the following S-E M700 Actuator specifications which include 2 independent 24 volt 4 amp AC-1 rated SPDT Auxiliary End Point Switches should be considered as appropriate: M700 - S2 - SRSU (880-0431-000) M700 - S2 - SRSD (880-0441-000) Alternatively Auxiliary Switch Pack S2 (880-0104-000) - Two independent 24 volt 4 amp AC-1 rated SPDT Auxiliary End Point Switches may be purchased separately permitting local installation.  Particular care should be taken when selecting a TAC Forta M700 Spring Return Actuator to replace an existing Satchwell ALMS, ALXS or ALES Spring Return Actuator.  Please refer to Replacement of Satchwell "AL..S" series Spring Return Linear Actuator by S-E M700 Spring Return Linear Actuator due to obsolescence.(Actuator Wiring). Please check the latest catalog for current equipment.

Issue Satchwell VSF or VJF Valve Body controlled by Satchwell Spring Return Actuator requires replacement. Environment Satchwell VSF or VJF Valve Body installed in Water or Steam Control Valve applications. Cause Obsolescence of Satchwell VSF or VJF Control Valve Body. Resolution STEAM APPLICATION 1.  Replace Satchwell VSF or VJF Valve Body with S-E Two-Port Flanged Valve Body. Where an existing Satchwell VSF or VJF Valve Body is utilised in a STEAM application, then the VSF or VJF Valve Body should be replaced by a suitably sized S-E VGS211F Valve Body, thus enabling steam having a steam inlet pressure up to 1300 kPa and a temperature up to 200 deg C to be controlled. It should be noted however that the face-to-face dimension and overall dimensions of each S-E Valve Body will differ to those of the Satchwell VSF or VJF Valve Body. It should also be noted that the operation of the VGS211F Valve Spindle is the reverse of that of the VSF or VJF Valve Spindle. When the VGS211F Valve Spindle is UP, or in the fully extended position, then the Valve is OPEN. Similarly, when the VGS211F Valve Spindle is DOWN, or in the fully retracted position, then the Valve is CLOSED This will therefore result in the need to replace the existing Satchwell Actuator with the correct model of S-E M700 Actuator, in order to ensure the correct operation of the Valve Body in the event of electrical power failure. It is important that the above limitations are recognised when replacing a Satchwell VSF or VJF Valve Body with a S-E VGS211F Valve Body in retrofit projects. Such limitations do not apply to new projects where a new S-E VGS211F Valve Body and a new S-E  M700 Actuator are being selected, providing of course that an Actuator having the correct spring action in the event of electrical power failure is selected. N.B. Steam Control Valves are normally required to CLOSE in the event of electrical power failure. In the case of the S-E VGS211F therefore the S-E M700 SRSD Actuator should be selected. WATER APPLICATION 1.  Replace Satchwell VSF or VJF Valve Body with S-E Two-Port Flanged Valve Body. A number of alternative models of S-E Two-Port Flanged Valve Bodies are available to replace existing Satchwell VSF or VJF Two-Port Flanged Valve Bodies. It should be noted however that the face-to-face dimension and overall dimensions of each S-E Valve Body will differ to those of the Satchwell VSF or VJF Valve Body.  

Issue Wiring configuration enabling connection of S-E Forta Actuator set in Increase / Decrease mode to early discrete Satchwell Climatronic CSC/CXR/CXT Controller. Environment S-E Forta Actuator set in Increase / Decrease mode connected to early discrete Satchwell Climatronic CSC/CXR/CXT Controller. Cause Obsolescence of previous Actuator connected to early discrete Satchwell Climatronic CSC/CXR/CXT Controller. Resolution 1.  Connect S-E Forta Actuator set in Increase / Decrease mode to early discrete Satchwell Climatronic CSC/CXR/CXT Controller.  It should be noted that when connecting a S-E Forta Actuator set in Increase / Decrease operation mode to an early discrete Satchwell Climatronic CSC/CXR/CXT Controller it may be necessary to wire the Actuator in a 24v OPEN / 24v CLOSE / 0v COMMON configuration instead of the 0v OPEN / 0v CLOSE / 24v COMMON configuration as shown in the S-E Forta Actuator Data Sheets. 2.  With S-E Forta Actuator DIL Switch No.2 set ON in Increase / Decrease mode wire to the S-E Forta Actuator terminals as follows :- 24v Supply – wire to Terminal G 0v   Supply – wire to Terminal G0 24v Open signal – wire to Terminal VH 24v Close signal – wire to Terminal VC N.B. This deviation from the standard S-E Forta Actuator installation method should be recorded in the site Operating & Maintenance manual. A 24v supply must be present across Terminals G / G0 for the S-E Forta Actuator to work satisfactorily. A 4-wire connection must be made to the S-E Forta Actuator, instead of the 3-wire connection made to any Satchwell Actuator it is replacing. It is important to ensure that the 24v Power Supply to both the S-E Forta Actuator and the Satchwell Climatronic Controller share the same 0v potential. It is also important to ensure that the 24v Power Supply is capable of providing the higher level of VA required to operate the S-E Forta Actuator compared to that of any Actuator that it may be replacing. 

Issue Replacement of Satchwell DRT3451 Adjustable Room Temperature Sensor by S-E STR612. Environment Satchwell DRT3451 Adjustable Room Temperature Sensor installations. Cause Obsolescence of Satchwell DRT3451 Adjustable Room Temperature Sensor Resolution Replace Satchwell DRT3451 Adjustable Room Temperature Sensor with S-E STR612 The STR612 provides the same functionality as the DRT3451 differing only in its appearance, dimensions and terminal identification. Equivalent terminal identification is as follows STR612 Terminal 22 (A) = DRT3451 Terminal A STR612 Terminal 23 (C) = DRT3451 Terminal C Connection of STR612 to CZU Fan Coil Unit Temperature Controller STR612 Terminal 22 (A) – connect to CZU Terminal 9 STR612 Terminal 23 (C) – connect to CZU Terminal 10 (CZU Setpoint should be set to 10 deg C)