Building Automation Knowledge Base

   

Issue When a SED-TRH-G-5045 sensor is positioned outside the range of the main EBO Zigbee wireless mesh, what is the recommended method or product to extend the wireless coverage? Product Line EcoStruxure Building Operation Environment Building Operation Automation Server Premium Cause The SED-TRH-G-5045 is a Zigbee pro sleepy end device. Resolution Any Zigbee router within the system can function as a repeater to extend the radio communication. The router should be positioned within the radio range of the sensor and within the range of the RPx or another router. If a Zigbee device is powered by mains, it typically operates as a router. While there are currently no SE products designed solely with "repeater capability," several SE products possess router capabilities in addition to other capabilities, SE8000 SpaceLogic room controller Wiser plug CCTFR6500 Wiser Power Micromodule CCTFR6730 Wiser Room Thermostat with display CCTFR6400 or CCTFR6401. We have not officially tested any 3rd party Zigbee routers, however the IKEA TRÅDFRI repeater is known to work effectively.

Issue How to identify what ports are being used on a PC. Product Line All product Lines. Environment Any Windows OS Cause Running multiple applications on the same PC without managing TCP/UDP port assignments can lead to conflicts. Resolution TCPView will help you identify all ports and services to each application. Download from Microsoft's website http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx Detailed instructions are available at the site.

Issue Does SHD2/SCD2 have galvanic isolation? Product Line EcoStruxure Building Operation Environment Building Operation SmartX Living Space Sensor Cause Galvanic isolation is a principle of isolating functional sections of electrical systems to prevent current flow; no direct conduction path is permitted. Resolution The SHD2XP2A/SCD2XPXAVX does not have galvanic isolation.

Issue SLP BACnet Setpoint limits Product Line EcoStruxure Building Operation, Andover Continuum, Field Devices Environment SpaceLogic SLP Series Cause The BACnet Object "Temperature Setpoint" includes properties Minimum and Maximum values These can be used to limit the setpoint, however the values are not saved in non volatile memory, thus the value revert to default after a power cycle (0 and 50 degC). The Setpoint object needs to be manually downloaded from EBO following a power cycle to set these properties. These properties cannot be written to individually. Thus changing these properties is unlikely to be good practice. Resolution A script program can be used to set limits to the Temperature Setpoint. Example below Note the "Value transfer settings" need changing to "Transfer value each time..." as below

Issue Information for replacement for the SPA1505 and SPA1506 Product Line Field devices Environment Pressure sensors Cause "PA-00167 Sensors and Input Devices New SPP930 Relative Pressure Switch" suggests SPP930 replaces SPA 1505 and SPA 1506. The link provided for the SPP930’s manufacturer’s data sheet, no longer works Resolution SPP930 Part number 004701160 replaces the SPA 1505 SPP930 Part number 004701170 replaces the SPA 1506 The site wiring should be checked, to ensure it complies with replacement switches reduced current ratings.   SPA 1505/1506 data sheet Huba Controls type 620/625 data sheet.

Issue The Insight Sensor and Multi Sensor Ambient Light Sensor require calibration before they can be effectively used. Product Line EcoStruxure Building Operation. Environment Insight Sensor. Multi Sensor Cause When setting up a new Insight Sensor or Multi Sensor device, the default settings for Gain and offset may result in inaccurate readings. Calibration is necessary to ensure accurate data collection based on the specific installation area. Resolution To perform the calibration, the following two tasks need to be carried out manually: Calibrate the Light Sensor: Conduct the calibration process in an environment without any daylight for optimal results. Set the light to 100%. Measure the lux level at the reference point using a lux meter. Adjust the gain settings on the sensor to match the measured lux level. Linearize the Feedback Signal: In some cases, lights may not provide a linear feedback (lux level) as the output increases. To compensate for this non-linearity, the signal from the controller is linearized before being sent to the output. During the optimization phase, the controller incrementally increases the output in 10% steps, measuring the adjacent lux levels for each step. The maximum lux supplement is calculated by subtracting the lux level at 100% output from the lux level at 0% output. After the optimization phase, breakpoints are determined and verified by re-running the test. If the results fall within the maximum difference limit compared to a linear signal, the calibration test is considered valid. Remember, performing the calibration process without any daylight present will yield the best results.  

Issue Satchwell AR Series 7 Rotary Actuator requires replacement Product Line Field Devices Environment Satchwell AR Series 7 Rotary Actuators installed on Air Dampers, Satchwell MB Series or MBF Series Rotary Shoe Valve Bodies. Actuator types :- ARE ARM ARX ARMS Cause Obsolescence of Satchwell AR Series 7 Rotary Actuators Resolution Replace Satchwell AR Series 7 Rotary Actuators with appropriate Schneider Electric MD Series Rotary Actuators and wire as follows :- Satchwell AR Series 7 Rotary Actuators installed on Air Dampers. ARE ARE Series 7 Wire Number 2 = MD20A-24 Wire Number 2 ARE Series 7 Wire Number 3 = MD20A-24 Wire Number 3 ARE Series 7 Wire Number 1 = MD20A-24 Wire Number 1 ARE Series 7 Wire Number 5 = MD20A-24 Wire Number 5 ARX ARX Series 7 Wire Number 3 = MD20B-24 Wire Number 3 ARX Series 7 Wire Number 2 = MD20B-24 Wire Number 2 ARX Series 7 Wire Number 1 = MD20B-24 Wire Number 1 ARM ARM Series 7 Wire Number 3 = MD20B-230 Wire Number 3 ARM Series 7 Wire Number 2 = MD20B-230 Wire Number 2 ARM Series 7 Wire Number 1 = MD20B-230 Wire Number 1 ARM Series 7 Wire EARTH = MD20B-230 NO EARTH REQUIRED ARMS ARMS Series 76021Term 3 (Open) = MD10SR-TS Blue G ARMS Series 7602 Term 2 (L1) = MD10SR-TS Not used *1 ARMS Series 7602 Term 1 (N) = MD10SR-TS Brown GO ARMS Series 7602 Wire EARTH = MD10SR-TS NO EARTH REQUIRED ARMS Series 7603 Wire Number 2 = MD10SR-T Blue G ARMS Series 7603 Wire Number 1 = MD10SR-T Brown GO ARMS Series 7604 Wire Number 2 = MD10SR-TS Blue G ARMS Series 7604 Wire Number 1 = MD10SR-TS Brown GO *1 Disconnect from the supply, label, and make safe at the supply and actuator.   N.B. Should the Satchwell AR Series 7 Actuator (not applicable to ARMS) include a wired Auxiliary Switch then the following Accessory should also be wired on the Schneider Electric MD Actuator as follows:- MD – S1 One independent SPDT 1 mA…3(0.5) A, 250 V AC Auxiliary Switch AR COMMON Wire Number S1 = MD-S1 COMMON Wire Number S1 AR N/O contact Wire Number S3 = MD-S1 N/O contact Wire Number S3 AR N/C contact Wire Number S2 = MD-S1 N/C contact Wire Number S2 MD – S2 Two independent SPDT 1 mA…3(0.5) A, 250 V AC Auxiliary Switches AR COMMON Wire Number S1 = MD-S2 COMMON Wire Number S1 AR N/O contact Wire Number S3 = MD-S2 N/O contact Wire Number S3 AR N/C contact Wire Number S2 = MD-S2 N/C contact Wire Number S2 AR COMMON Wire Number S4 = MD-S2 COMMON Wire Number S4 AR N/O contact Wire Number S6 = MD-S2 N/O contact Wire Number S6 AR N/C contact Wire Number S5 = MD-S2 N/C contact Wire Number S5   Satchwell AR Series 7 Rotary Actuators installed on Satchwell MB Series Screwed Rotary Shoe Valve Bodies. ARE ARE Series 7 Wire Number 2 = MD10A-24 Wire Number 2 ARE Series 7 Wire Number 3 = MD10A-24 Wire Number 3 ARE Series 7 Wire Number 1 = MD10A-24 Wire Number 1 ARE Series 7 Wire Number 5 = MD10A-24 Wire Number 5 ARX ARX Series 7 Wire Number 3 = MD10B-24 Wire Number 3 ARX Series 7 Wire Number 2 = MD10B-24 Wire Number 2 ARX Series 7 Wire Number 1 = MD10B-24 Wire Number 1 ARM ARM Series 7 Wire Number 3 = MD10B-230 Wire Number 3 ARM Series 7 Wire Number 2 = MD10B-230 Wire Number 2 ARM Series 7 Wire Number 1 = MD10B-230 Wire Number 1 ARM Series 7 Wire EARTH = MD10B-230 NO EARTH REQUIRED N.B. Should the Satchwell AR 7 Series Actuator include a wired Auxiliary Switch then the following Accessory should also be wired on the Schneider Electric MD Actuator as follows :- MD – S1 One independent SPDT 1 mA…3(0.5) A, 250 V AC Auxiliary Switch AR COMMON Wire Number S1 = MD-S1 COMMON Wire Number S1 AR N/O contact Wire Number S3 = MD-S1 N/O contact Wire Number S3 AR N/C contact Wire Number S2 = MD-S1 N/C contact Wire Number S2 MD – S2 Two independent SPDT 1 mA…3(0.5) A, 250 V AC Auxiliary Switches AR COMMON Wire Number S1 = MD-S2 COMMON Wire Number S1 AR N/O contact Wire Number S3 = MD-S2 N/O contact Wire Number S3 AR N/C contact Wire Number S2 = MD-S2 N/C contact Wire Number S2 AR COMMON Wire Number S4 = MD-S2 COMMON Wire Number S4 AR N/O contact Wire Number S6 = MD-S2 N/O contact Wire Number S6 AR N/C contact Wire Number S5 = MD-S2 N/C contact Wire Number S5   Satchwell AR Series 7 Rotary Actuators installed on Satchwell MBF Series Flanged Rotary Shoe Valve Bodies ARE ARE Series 7 Wire Number 2 = MD20A-24 Wire Number 2 ARE Series 7 Wire Number 3 = MD20A-24 Wire Number 3 ARE Series 7 Wire Number 1 = MD20A-24 Wire Number 1 ARE Series 7 Wire Number 5 = MD20A-24 Wire Number 5 ARX ARX Series 7 Wire Number 3 = MD20B-24 Wire Number 3 ARX Series 7 Wire Number 2 = MD20B-24 Wire Number 2 ARX Series 7 Wire Number 1 = MD20B-24 Wire Number 1 ARM ARM Series 7 Wire Number 3 = MD20B-230 Wire Number 3 ARM Series 7 Wire Number 2 = MD20B-230 Wire Number 2 ARM Series 7 Wire Number 1 = MD20B-230 Wire Number 1 ARM Series 7 Wire EARTH = MD20B-230 NO EARTH REQUIRED N.B. Should the Satchwell AR Series 7 Actuator include a wired Auxiliary Switch then the following Accessory should also be wired on the Schneider Electric MD Actuator as follows :- MD – S1 One independent SPDT 1 mA…3(0.5) A, 250 V AC Auxiliary Switch AR COMMON Wire Number S1 = MD-S1 COMMON Wire Number S1 AR N/O contact Wire Number S3 = MD-S1 N/O contact Wire Number S3 AR N/C contact Wire Number S2 = MD-S1 N/C contact Wire Number S2 MD – S2 Two independent SPDT 1 mA…3(0.5) A, 250 V AC Auxiliary Switches AR COMMON Wire Number S1 = MD-S2 COMMON Wire Number S1 AR N/O contact Wire Number S3 = MD-S2 N/O contact Wire Number S3 AR N/C contact Wire Number S2 = MD-S2 N/C contact Wire Number S2 AR COMMON Wire Number S4 = MD-S2 COMMON Wire Number S4 AR N/O contact Wire Number S6 = MD-S2 N/O contact Wire Number S6 AR N/C contact Wire Number S5 = MD-S2 N/C contact Wire Number S5   Product Information. For details of AR Series 7 ARM ARX ARE please see here For details of AR Series 7602 and 7603 please see here. For details of the MD10 SR Damper Actuator please see here. For details of MD10A please see here For details of MD10B please see here For details of MD20A please see here For details of MD20B please see here For details of MD-S1 please see here For details of MD-S2 please see here

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 DxT sensors are replaced by STR600, STP660, STD600, STO600 type T with shunt, and use the Satchwell T range chart 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 INET, IA, the document Thermistor Types Tables (Veris Industries) is available.  The 1k Balco resistance chart is also 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 Satchwell “M 1201” Actuator forming part of combined Actuator / 2-port Valve Body assembly requires replacement. Environment Stand alone Satchwell “M 1201” Actuator forming part of combined Actuator / 2-port Valve Body assembly M 1201 Actuator 2-port Valve Body Cause Obsolescence of Satchwell “M 1201” forming part of combined Actuator / 2-port Valve Body assembly. Resolution There is no direct replacement for the "M 1201" Actuator and as a result both the "M 1201" Actuator and the 2-port Valve Body to which it is connected will also require replacement.  Replace Satchwell “M 1201” combined Actuator & 2-port Valve Body assembly with Schneider Electric MD10B-230 Actuator, LMD-MB Linkage Kit and Satchwell MB series 3-port Valve Body of appropriate size. Details of the original Satchwell “M 1201” combined Actuator & 2-port Valve Body assembly may be viewed here. Details of the replacement Schneider Electric MD10B-230 Actuator may be viewed here. Details of the replacement Schneider Electric LMD-MB Linkage Kit may be viewed here. Details of the replacement Satchwell MB 3-port Valve Body may be viewed here. N.B. Satchwell MB series 3-port Rotary Shoe Valve Body may be converted for use as a 2-port Zone Valve by means of the installation of a plumber’s plug in Port 3 Install plumber's plug in Port 3 of MB series 3-port Rotary Shoe Valve Body. Tighten plumber's plug sufficiently to ensure PN 10 rating of Valve Body is not compromised. It is possible that the "M 1201" Actuator may have been fitted with an Auxiliary Switch. If so then an MD-S1 Auxiliary Switch may be fitted to the MD10B-230 Actuator if required. Details of the MD-S1 Auxiliary Switch may be viewed here.

Issue What new features are planned for inclusion in future product releases? Product Line Andover Continuum, EcoStruxure Building Operation, Field Devices, Satchwell BAS & Sigma, Satchwell MicroNet, TAC IA Series, TAC INET, TAC Vista, EcoStruxure Access Expert, EcoStruxure Security Expert Environment All product ranges Cause Information required on future Product Marketing plans. Resolution This document is no longer published on the Download Center by Product Management. For further information on the future product planning please contact the Product Manager for the specific product in your region. Americas: Americas.EcoStruxureBuilding@schneider-electric.com EMEA: EMEA.EcoStruxureBuilding@schneider-electric.com Asia Pacific & India: AsiaPac.EcoStruxureBuilding@schneider-electric.com

Issue In applications where heating is not required is it possible to change the thermostat operation to cooling only? Product Line Field Devices Environment TC300 thermostat Cause By default the TC300 thermostat is configured for heating and cooling. It should be possible to lockout operation of heating in cooling only applications so that the user cannot inadvertently change modes. Resolution In thermostat model TC303-3A2DLS parameter item 7 allows selection of cooling or heating only mode.

Issue Confusion in documentation of the output type of an STR300 temperatire transmitter Product Line Field Devices Environment STR300 series transmitter Cause The STR300 is an electronic living space transmitter that converts a measured temperature into an electric current signal. The transmitter is delivered as a complete unit, comprising a Pt100 classB sensing element and an amplifier mounted in a housing. STR300 is intended either for surface mounting on a wall or installation in a standard switch box in dry, dust free rooms.   The HVAC Sensors Catalogue incorrectly shows that the STR300 Series has an Output of 0-10V while  the datasheet correctly shows the output as 4-20ma. Resolution The STR300 has an output signal of 4 to 20 mA corresponding to a temperature range of 0-40°C

Issue What is pneumatic actuator spring range shift and how can it be eliminated? Product Line Field Devices Environment Pneumatic Actuator Cause Spring range shift is an inherent feature of all spring return pneumatic actuators without positive positioners. The nominal published spring range of a pneumatic actuator without a positive positioner is the air pressure required to fully stroke the actuator WITH NO EXTERNAL LOAD. In the extend direction against an opposing load as provided by a damper or a valve, the supply air pressure must be increased above the spring range of the actuator to overcome the spring and the opposing force. In the retract direction against an opposing load as provided by a damper or a valve, the supply air pressure must be decreased below the spring range of the actuator so that the spring can overcome the air pressure and the opposing force. Under constant load conditions, the range of the actuator is offset by the amount of air pressure required to provide close-off of the damper or the valve. Resolution When is "Spring Range Shift" a concern? It is a concern when two or more pneumatic controlled devices should be sequenced from one pneumatic signal without an overlap. An example would be a normally open heating valve and a normally closed cooling valve being sequenced from a direct acting thermostat, In this example the spring range of the normally open valve will shift upward and the normally closed valve will shift downward which means the two valves may overlap. Another area of concern is that pneumatic control signal provides proper pressure span to operate the control device and provide "tight" close-off of damper or valve. Examples of limited pressure change would be: pneumatic controllers maximum output which is limited by main air pressure; the low pressure output capability of a pneumatic controller; and electronic to pressure transducer which can have a limited output such as 3 to 15 psig.   What can be done to overcome "Spring Range Shift" when sequencing devices? Sequencing can be accomplished in a pneumatic system by selecting actuators with appropriate spring ranges, utilizing positive positioners (AK-42309-500 or N800-0555) or ratio relays with bias adjustment (2378-501) or controllers with separate outputs for each actuator. Positive positioners on damper and valve actuators provide the versatility of start point and span adjustment plus the availability of full pneumatic power for positioning. This is the ideal way to provide precision sequencing, since variable loading on the actuator will not effect the sequencing. Biased start ratio relays may be used to provide a method of sequencing by amplifying or shifting the pneumatic signal. For applications involving sequencing a pressure to electric (P.E.) switch with a pneumatic actuator, the P.E. can often be adjusted to operate outside the operating range of the actuator. Sometimes larger actuators will help the sequencing problem. Using full actuator stroke to rotate the damper less than 90 degrees increases the force delivered to the damper and therefore reduces control signal change required to control the actuator. Rotating the damper 60 degrees usually provides almost full flow through the damper. If the actuator has an adjustable start point, adjusting the start points can help prevent sequencing problems. Normally open valves or dampers should have start point adjusted to the minimum and normally closed adjusted to the maximum. Sequencing problems can be eliminated by providing controllers with separate outputs for each actuator and do the sequencing in the controller. What can be done to increase the close-off of a damper or valve actuator due to limited or insufficient pneumatic control pressure to the control device? Proper control and close-off of the control device can be accomplished by selecting actuators with appropriate spring ranges, utilizing positive positioners (AK-42309-500 or N800-0555) or ratio relays with bias adjustment ( 2378-501). Positive positioners on damper and valve actuators provide the versatility of start point and span adjustment plus the availability of full pneumatic power for positioning (0 to main air pressure to the actuator). Biased start ratio relay provide a method of amplifying or shifting the pneumatic signal. Selecting larger actuators will increase close-off pressure. Using full actuator stroke to rotate the damper less than 90 degrees increases the force delivered to the damper. Rotating the damper 60 degrees usually provides almost full flow through the damper. If the actuator has an adjustable start point, proper adjustment of the start points will increase close-off. Normally open valves or dampers should have start point adjusted to the minimum and normally closed adjusted to the maximum. Provide electronic to pneumatic transducers with sufficient input span to obtain maximum or sufficient pneumatic output.

Issue TC303 Time and Day of the Week Settings Product Line Field Devices Environment TC303 Series Fan Coil Thermostat Cause The time and day displayed on the thermostat is incorrect Resolution Press and hold the M button on the thermostat for approximately 3 seconds and the time's hour will start to blink. Use the Up/Down arrows to change the value. Press the M button again to switch the focus to minutes and the day of the week. 

Issue Resistance against temperature Product Line Field Devices Environment TC300 thermostat range TC900 thermostat range RS-03 remote sensor Cause Remote sensor compatibility Resolution The TC thermostat range use a 10K type 3 (3950) Negative Temperature Coefficient (NTC) thermistor. Whilst this is similar to the 10K type 3 thermistor used in the other BMS field device sensors such as the SpaceLogic SLA range, it has a different resistance curve and the temperature read will be different.   The table below shows that at typical room temperatures the error is 0.6°C or less. T(°C) RS-03 R(KΩ) SPA R(KΩ) Error % Error °C 0 31.77 29.575 6.91% 1.736 5 24.94 23.504 5.76% 1.366 10 19.68 18.809 4.43% 1.052 15 15.62 15.146 3.03% 0.812 20 12.47 12.271 1.60% 0.63 25 10 10 0.00% 0 30 8.064 8.195 -1.62% 0.3872 35 6.538 6.752 -3.27% 0.3052 40 5.327 5.592 -4.97% 0.2422 45 4.363 4.655 -6.69% 0.1928 50 3.592 3.893 -8.38% 0.1542   Click here to view the TC thermostat's RS-03 remote temperature against resistance chart. Click here to download the chart that provides the temperature against resistance reading for the TC thermostat's RS-03 remote temperature sensors.

Issue Values in EBO from a PM5000 series energy meter do not update Product Line EcoStruxure Building Operation, Field Devices Environment Building Operation Server BACnet PM5000 series energy meter Cause The EBO trace log shows a lot of BACnet related error messages, such as:   nsp.pin.BACnet.VariableProperty Subscription to ~/BACnet Interface/IP Network/PM 5340/Application/THD Current - Ph G attempted COV, but will POLL due to BACnet error: 0x00030013 (resources,no_space_to_add_list_element)   This error indicates that a Change of Value (COV) subscription is being attempted but has failed. This is due to a resource issue with the device, i.e., error class 0x0003 from error code 0x00030013. The error is no space to write property (0013 part) which suggests the subscription limit of the device has been reached. Refer to the Decoding BACnet Errors Knowledge Base article for further information on decoding the error code.   Reviewing the PM5300 series user manual reveals that the device only supports 20 COV subscriptions.     Resolution Remove BACnet objects that are not required in EBO, it is unlikely that fewer than 20 values will be practical. Disable COV for the device in EBO. This can be done via the service_blacklist as noted in the BACnet RULES implementation to disable features such as readPropertyMultiple, COVs etc How to disable RPM (readPropertyMultiple), COVs etc services in AS/ES BACnet interface. Knowledge Base article. The following is an example service_blacklist for the PM3450 <blacklist> <rule> <vendor>10</vendor> <model>PM5340</model> <no-cov/> <no-rpm/> </rule> </blacklist> Polling can put an unintended load on the polling device and the polled device. The polling intervals should be adjusted using the settings on the BACnet Interface. This is available from BACnet Interface -> Properties -> Advanced and scroll all the way to the bottom as shown below for an ES. If looking at the option for an Automation Server it will also have additional options for the RS485 communication ports. Minimum polling intervals in the range of 5,000 to 10,000ms are a good starting point.  

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 do you reset the Viconics VT7200, VT7300, & VT7600 LON series thermostats back to factory default values? Product Line Field Devices Environment SSL SE7000 Cause There's no button or command that sets the thermostat to its default parameter settings. Resolution Either set them manually or through the snvts available via a LON integration.  The Viconics Lon Integration Manual will help with identifying the proper snvts to use.

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