Siemens BACnet VAV Actuator Owner’s Manual 125-5037 Rev.
Rev. AA, February 2008 NOTICE The information contained within this document is subject to change without notice and should not be construed as a commitment by Siemens Building Technologies, Inc. Siemens Building Technologies, Inc. assumes no responsibility for any errors that may appear in this document. All software described in this document is furnished under a license and may be used or copied only in accordance with the terms of such license.
Table of Contents How To Use This Manual..............................................................................................V Manual Organzation ......................................................................................................V Manual Conventions .....................................................................................................VI Manual Symbols ............................................................................................................
Table of Contents Fail-safe Operation ....................................................................................................7 Heating and Cooling Switchover ...............................................................................7 Modulate Damper During Heating Mode (optional) ...................................................7 Hot Water Reheat ......................................................................................................8 Electric Reheat.......................
Siemens BACnet VAV Actuator Owner’s Manual Point Database ..............................................................................................................20 Overview ....................................................................................................................20 Troubleshooting ............................................................................................................29 Basic Service Information ...........................................................
How To Use This Manual This manual is written for the owner and user of Siemens Building Technologies BACnet VAV Actuator. It is designed to help you become familiar with the Siemens BACnet VAV Actuator and its applications. This section covers manual organization, manual conventions, symbols used in the manual, and other information that will help you use this manual.
How To Use This Manual Manual Conventions The following table lists conventions to help you use this manual in a quick and efficient manner. Convention Actions that you should perform are specified in boldface font. Example Type F for Field panels. Click OK to save changes and close the dialog box. Error and system messages are displayed in Courier New font. The message Report Definition successfully renamed appears in the status bar. New terms appearing for the first time are italicized.
1 Product Overview Introduction The BACnet VAV Actuator is the Siemens Building Technologies, Inc. FLN controller used in pressure independent Variable Air Volume applications (Figure 1). It provides Direct Digital Control (DDC) for eight applications, and can operate independently as a stand-alone DDC room controller or networked with a field panel. The controller provides all input/output, system, and local communication connections. Hardware consists of the controller and the mounting bracket.
Product Overview Air Velocity Sensor BACnet Connection Status/DO LEDs Power Connection TEC0496R1 Airflow Pickup Tubes Figure 1. Siemens BACnet VAV Actuator. Hardware Inputs Analog • Air Velocity Sensor (AVS) • Duct temperature sensor (optional) • Room temperature sensor (RTS) • Room temperature setpoint dial (optional) • Night mode override (optional) • Wall switch (optional) Application 2561 Digital Hardware Outputs Analog • 2 None Siemens Building Technologies, Inc.
Siemens BACnet VAV Actuator Owner’s Manual Digital Application • Autozero Module (AZM) (optional) 2560, 2561, 2562, 2563 • Damper Actuator All • Fan 2565, 2566, 2567 • First valve actuator (required) 2563 • Second valve actuator (optional) or AZM (optional) 2563 • Stage 1 electric reheat; or, 2-position heating valve 2562 • Stage 1 electric reheat 2564, 2566 • Stage 2 electric reheat (optional) 2562, 2564, 2566 • Stage 3 electric reheat (optional) 2562, 2564, 2566 • Valve actua
Product Overview Communication Wiring The controller connects to the field panel by means of a Floor Level Network (FLN) trunk. Communication wiring connects to the three screw terminals on the controller labeled “+” (positive), “-“(negative), and “S” (Shield) (Figure 3). FLN TRUNK 3-Wire Network Interface + - - + e to earth Terminator TEC05XXR1 (SHIELD) - + - + Note: = System Common (SHIELD) (-) 120 ohm ½W (+) 120 ohm ½W TEC0516R2 (+) (-) Figure 3. Communication Wiring (2-wire).
Siemens BACnet VAV Actuator Owner’s Manual Duct Temperature Sensor An optional duct temperature sensor provides duct air temperature sensing inputs to the controller. For more information about temperature sensors, contact your local Siemens Building Technologies, Inc. representative.
2 Applications Basic Operation The BACnet VAV Actuator provides Direct Digital Control (DDC) for Variable Air Volume (VAV) terminal box applications. Temperature control varies with the application. If present, heating can be provided by hot water, up to three stages of electric reheat, or optional baseboard radiation. Sequencing Logic (optional) This application has the additional capability to sequence the flow and mechanical heating when heated supply air is available.
Siemens BACnet VAV Actuator Owner’s Manual Calibration Air Velocity Sensor - Calibration of the controller's internal air velocity sensor is periodically required to maintain accurate air velocity readings. Calibration may be set to take place automatically or manually. Autozero Module (AZM) – Used when damper cannot be closed and constant airflow is needed. • For a controller used with an AZM, calibration occurs without closing the damper. Application 2560, 2561, 2562, 2563.
Applications Hot Water Reheat • CAUTION: Do not set HTG FLOW MIN to 0 cfm (0 lps). A minimum airflow should be provided across the heating coils when the heating valve is open. When the controller is in cooling mode, the heating valve(s) are closed. The heating loop modulates the heating valve(s) to warm up the room. In cooling mode, the heating valve is closed.
Siemens BACnet VAV Actuator Owner’s Manual Application 2560 VAV Cooling Only Overview In Application 2560, the controller modulates the supply air damper of the terminal box for cooling. In order for it to work properly, the central air-handling unit must provide cool supply air. See Figure 5.
Applications Application 2561 VAV Cooling or Heating Overview In Application 2561, the controller modulates the supply air damper of the terminal box for cooling and heating. In order for it to work properly, the central air-handling unit must provide cool supply air in cooling mode and warm air in heating mode. See Figure 6.
Siemens BACnet VAV Actuator Owner’s Manual Application 2562 VAV with Electric Reheat or Baseboard Radiation Overview In Application 2562, the controller modulates the supply air damper for the terminal box for cooling and controls stages of electric reheat or baseboard radiation for heating. When in heating, the terminal box either maintains minimum airflow or modulates the supply air damper. In order for the terminal box to work properly, the central air-handling unit must provide supply air.
Applications Supply Air Damper 3 to 5 Straight Duct Diameters required for proper sensor reading Supply Air SAFETIES BY OTHERS Air Velocity Sensor Modulating Damper Actuator Elec Heat Stage 3 Electric Heat Stage 2 "COMMON" Termination for all DOs C 3 4 5 6 Spare DO or Autozero Module (Opt.) Electric Heat Stage 1 TEC2562ACDR1 RTS NO Wall Switch (Opt.) 10K ohm Thermistor or Spare DI FLN Hi/Lo Tubing Connections BACnet Actuator Controller Figure 7.
Siemens BACnet VAV Actuator Owner’s Manual Application 2563 VAV with Hot Water Reheat Overview In Application 2563, the controller modulates the supply air damper of the terminal box for cooling and modulates a reheat valve (or valves) for heating. When in heating, the terminal box either maintains minimum airflow or modulates the supply air damper. In order for the terminal box to work properly, the central air handling unit must provide supply air. See Figure 9 and Figure 10.
Applications Supply Air Damper 3 to 5 Straight Duct Diameters required for proper sensor reading Supply Air SAFETIES BY OTHERS Air Velocity Sensor Modulating Damper Actuator "COMMON" Termination for all DOs C 3 4 5 6 Valve Actuator Valve Actuator TEC2563BCDR1 RTS NO Wall Switch (Opt.) 10K ohm Thermistor or Spare DI FLN Hi/Lo Tubing Connections BACnet Actuator Controller Figure 10. Application 2563 Control Drawing (Two Valve Actuators). 14 Siemens Building Technologies, Inc.
Siemens BACnet VAV Actuator Owner’s Manual Application 2564 VAV Series Fan Powered with Electric Reheat Overview In Application 2564, the controller modulates the supply air damper of the terminal box for cooling and controls stages of electric reheat for heating. When in heating, the terminal box either maintains minimum airflow or modulates the supply air damper. The terminal box also has a series fan for air circulation.
Applications Application 2565 VAV Series Fan Powered with Hot Water Reheat Overview In Application 2565, the controller modulates the supply air damper of the terminal box for cooling and modulates a hot water valve for heating. When in heating, the terminal box either maintains minimum airflow or modulates the supply air damper. The terminal box also has a series fan for air circulation. In order for the terminal box to work properly, the central air handling unit must provide supply air. See Figure 12.
Siemens BACnet VAV Actuator Owner’s Manual Application 2566 VAV Parallel Fan Powered with Electric Reheat Overview In Application 2566, the controller modulates the supply air damper of the terminal box for cooling and controls stages of electric reheat for heating. When in heating, the terminal box either maintains minimum airflow or modulates the supply air damper. The terminal box also has a parallel fan, which re-circulates the room air.
Applications Application 2567 VAV Parallel Fan Powered with Hot Water Reheat Overview In Application 2567, the controller modulates the supply air damper of the terminal box to provide for cooling and modulates a hot water valve for heating. When in heating, the terminal box either maintains minimum airflow or modulates the supply air damper. The terminal box also has a parallel fan that re-circulates the room air.
Siemens BACnet VAV Actuator Owner’s Manual Application 2597 Slave Mode Overview Application 2597 is the slave mode application for the BACnet VAV Actuator (P/N 550-430 and 550-431). Slave mode is the default application that comes up when power is first applied to the controller. Slave mode provides no control. Its purpose is to allow the operator to perform equipment checkout before a control application is put into effect and to set some basic controller parameters (CTLR ADDRESS, APPLICATION, etc.).
3 Point Database Overview Chapter 3 presents a description of the BACnet VAV Controller — Electronic Output point database, including point descriptors, point addresses, and a listing of applications in which each point is found. Descriptor Address1 Application CTLR ADDRESS 01 All Identifies the controller on the FLN trunk. APPLICATION 02 All Identification number of the program running in the controller.
Siemens BACnet VAV Actuator Owner’s Manual Address1 Application Description RM STPT MAX 12 All except 2597 The maximum temperature setpoint in degrees that the controller can use from the setpoint dial. This overrides any temperature setpoint from the setpoint dial that falls above this maximum. RM STPT DIAL {13}2 All The temperature setpoint in degrees from the room temperature sensor (not available on all temperature sensor models).
Point Database Descriptor NGT OVRD {21} 2 Application Description All except 2597 Indicates the mode that the controller is operating in with respect to the override switch. NIGHT indicates that the switch has not been pressed and the override timer is not active. DAY indicates that the switch has been pressed and the override timer is active. The controller then uses a day mode temperature setpoint. This point is only in effect when DAY.NGT indicates night mode.
Siemens BACnet VAV Actuator Owner’s Manual Address1 Application PARALLEL OFF 30 2566, 2567 CLG FLOW MIN 31 All except 2597 The minimum amount of air in CFM (LPS) to be supplied to the space in cooling mode. CLG FLOW MAX 32 All except 2597 The maximum amount of air in CFM (LPS) to be supplied to the space in cooling mode. HTG FLOW MIN 33 All except 2560, 2597 The minimum amount of air in CFM (LPS) to be supplied to the space in heating mode.
Point Database Address1 Application DO 4 {44} All except 2562, 2564, 2566 Digital output 4 controls a 24 Vac load with an ON or OFF status. If Motor 2 is enabled, DO 4 is coupled with DO 3 to control an actuator. HEAT STAGE 2 {44} 2562, 2564, 2566 This point is DO 4 in applications with electric reheat. This digital output controls the contact for the second stage of heating and has a status of ON or OFF.
Siemens BACnet VAV Actuator Owner’s Manual Address1 Application MTR2 POS {53} 2560, 2561, 2597 VLV POS {53} 2565 The current position of the valve in percent of full travel for applications using a water valve. This value is calculated based on motor run time. VLV1 POS {53} 2563 The current position of valve 1 in percent of full travel for applications using a water valve. This value is calculated based on motor run time.
Point Database Address1 Application Description HTG l GAIN 68 All except 2560, 2597 The integral gain value for the heating temperature control loop. HTG D GAIN 69 All except 2560, 2597 The derivative gain value for the heating temperature control loop. CHK STATUS 70 All FLOW P GAIN 71 All except 2597 The proportional gain value for the flow control loop. FLOW l GAIN 72 All except 2597 The integral gain value for the flow control loop.
Siemens BACnet VAV Actuator Owner’s Manual Address1 Application 83 2562, 2564, 2566 The value, in percent, which the heating loop must go below for the electric heat to be OFF for the full duty cycle (STAGE TIME). DMPR STATUS {84}2 2560, 2561, 2562, 2563 This point is used only when CAL MODULE set to YES. It readjusts the damper position if the command value is not equal to the actual position of the damper. CAL indicates that the damper is operating normally.
Point Database Address1 Application Description {94} All YES commands the controller to go through calibration sequence for the air velocity transducers. YES is also displayed when the calibration sequence is started automatically. CAL AIR automatically returns to NO after the calibration sequence is completed. Valid input: YES or NO. CAL SETUP 95 All The configuration setup code for the calibration sequence options.
4 Troubleshooting This chapter describes corrective measures you can take should you encounter a problem when using a BACnet VAV Actuator. You are not required to do any controller troubleshooting. You may want to contact your local Siemens Building Technologies representative if a problem occurs or you have any questions about the controller. NOTE: When troubleshooting, record what the problem is and what actions were performed immediately before the problem occurred.
Troubleshooting Safety Features The controller board stores the controller's address, applications, and point values. In the event of a power failure or a reset, these values are retrieved from the controller's permanent memory and are used by the controller unless overridden by a field panel. If one of the following conditions occurs, the controller will activate safety features present in its fail-safe mode. • Sensor failure. • Loss of power.
Siemens BACnet VAV Actuator Owner’s Manual Failure codes indicate the following possible problems. Room temperature sensor failed—CHK STATUS = 1 1. The cable for the room temperature sensor may be unplugged or loose. Check both ends to ensure that the cable is securely seated. 2. Connect directly to the controller through the room temperature sensor connection on the BACnet VAV Actuator and check whether communication is possible. If so, the problem lies in the room temperature sensor or its cable.
Troubleshooting 4. Box sizing information may be incorrect. Check the values of the following points and correct as needed: • DUCT AREA • FLOW COEFF • CLG FLOW MIN • CLG FLOW MAX 5. Motor setup information may be incorrect. Check the values of the following points and correct as needed: • MTR SETUP • MTR1 TIMING • DMPR ROT ANG 6. The box may not have been balanced correctly. Contact your local Siemens Building Technologies Representative. 7. The air velocity sensor may need calibration.
Glossary Overview The glossary contains terms and acronyms that are used in this manual. For definitions of point database descriptors, see Chapter 3, Point Database, in this manual. AI Analog Input. A point receiving a signal that represents a condition that has more than two states. For example, flow rate sensors (water or air), temperature sensors (room or duct), pressure sensors (static or velocity), and humidity sensors (room, duct, or outdoor).
Glossary control loop PID algorithm that is used to control an output that is based on a setpoint and an input reading from a sensor. DDC Direct Digital Control. DI Digital Input. Physical input point that receives a two-state signal (ON/OFF, OPEN/CLOSED, YES/NO). DO Digital Output. Physical output point that sends a two-state signal (ON/OFF, OPEN/CLOSED, YES/NO). English units The foot-pound-second system of units for weights and measurements.
Siemens BACnet VAV Actuator Owner’s Manual HMI Human Machine Interface. Terminal and its interface program that allows you to communicate with a field panel or equipment controller. override switch Button on a room temperature sensor that an occupant can press to change the status of a room from unoccupied to occupied (or from night to day) for a predetermined time. pressure independent Variable Air Volume (VAV) room temperature control system in which the temperature drives an airflow setpoint.
Glossary Terminal Equipment Controller Siemens Building Technologies, Inc. product family of equipment controllers (one is the BACnet VAV Controller - Electronic Output) that house the applications software used to control terminal units, such as heat pumps, VAV terminal boxes, fan coil units, unit ventilators, etc. unbundle Term used to describe the entering of a point that resides in a controller's database into the field panel's database so that it can be monitored and controlled from the field panel.
Index A air velocity sensor failure code ................................................... 30 troubleshooting ............................................. 31 Air Velocity Sensor (AVS) .................................. 2 algorithm .......................................................... 33 application 2560 control drawing ............................................... 9 overview ......................................................... 9 application 2561 control drawing ...............................
Index Direct Digital Control (DDC) ........................... 1, 6 DO .................................................................... 34 E English units ..................................................... 34 equipment controller...................................34, 36 R related equipment .............................................. 5 relay module ...................................................... 5 room temperature sensor failure code ...................................................
