Siemens BACnet Heat Pump Controller – MultiStage Owner’s Manual 125-699 Rev. BA, July 2009 Siemens Building Technologies, Inc.
Rev. BA, July 2009 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...............................................................................................III Manual Organization ..................................................................................................III Manual Conventions ..................................................................................................III Manual Symbols ........................................................................................................
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Compressor Operation ..............................................................................................9 Fan Operation ............................................................................................................9 Power Failure Recovery ............................................................................................10 Centralized Alarm Monitoring ..........................................................
How to Use This Manual This manual is written for the owner and user of the Siemens Building Technologies, Inc. Heat Pump Controller—Multi-Stage, often referred to as controller for the remainder of this manual. This manual is designed to help you become familiar with the controller and its applications. This chapter covers manual organization, manual symbols and conventions used in the manual, and how to access help.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Manual Symbols The following table lists symbols that are used to draw your attention to important information. Notation Symbol Meaning CAUTION: Indicates that equipment damage or loss of data may occur if the user does not follow a procedure as specified. WARNING: Indicates that personal injury or loss of life may occur to the user if a procedure is not performed as specified.
1 Product Overview Introduction The Siemens BACnet Heat Pump Controller—Multi-Stage is used in multiple compressor heat pump applications. lt provides Direct Digital Control (DDC) for two heat pump applications. The controller can operate as an independent, stand-alone DDC room controller or it can be networked with a field panel. The controller provides all termination, input/output, system, and local communication connections (Figure 1).
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual COVER CONTROLLER BOARD MOUNTING HOLE (2) 24 V-AC RX TX BST C H GND FLN TRUNK + - + - DO 1 DO 2 DO 3 DO 4 DO 5 DO 6 DO 7 DO 8 NO C NO C NO C NO C NO C NO C NO C NO C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 AI 3 AI 4 AI 5 + - + - + - DI 2 DI 6 AO 1 AO 2 AO 3 + - + - + - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 RTS MOUNTING RAIL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 1 2 1 2 3 4 5 6 7 8 9 10 DO LEDS TEC04XXR1 POWER TRUNK
Product Overview Application Digital • Compressor 1 2583 • Compressor 2 (optional); or stage 3 electric heat (optional) 2583 • Compressor 3 (optional); or stage 2 electric heat (optional) 2583 • Stage 1 electric heat (optional) 2583, 2584 • Reversing valve 2583 • Damper actuator (floating control) (optional) 2583, 2584 • Fan 2583, 2584 • Stage 1 cooling compressor (optional) 2584 • Stage 2 cooling compressor (optional) 2584 • Stage 1 heating compressor (optional) 2584 • Stag
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Controller LED Indicators The controller has several Light Emitting Diode (LED) indicators. (Figure 1). Table 2 lists the LED types and what they indicate. Table 2. Controller LEDs. LED Type Label (if present)* Indication DO LED 1–LED 8 Receive RX Indicates , when flashing, that the controller is receiving information from the field panel.
Product Overview Related Equipment • Relay Module • Damper Actuator(s) • Mixed Air Temperature Sensor (optional) • Room Temperature Sensor Contact your local Siemens Building Technologies, Inc. representative for product numbers and more information. Siemens Building Technologies, Inc.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual 6 Siemens Building Technologies, Inc.
2 Applications Basic Operation The Siemens BACnet Heat Pump Controller—Multi-Stage provides Direct Digital Control (DDC) technology for multiple compressor heat pump applications. Temperature control varies with the application. If present, mixed air temperature control and up to three stages of electric heat or staged heating and cooling can be provided.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual The mixed air loop controls only the mixed air portion of the application. The mixed air damper motor can be either a spring return or floating control damper motor. • For a spring return damper, the mixed air loop will control the damper through its 0 to 10 volt analog output and the digital outputs will be spare.
Applications Heating and Cooling Switchover The heating/cooling switchover determines whether the controller is in heating or cooling mode by monitoring the room temperature and the demand for heating and cooling (as determined by the temperature control loops). Electric Reheat CAUTION: Verify that the equipment is supplied with safeties by others to ensure that there is airflow across the heating coils when they are to be energized.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Power Failure Recovery Upon return from a power failure, the heating and cooling compressors are kept off, the electric heat (if used) is kept off and the fan is kept off. In addition to the equipment being OFF, both cooling and heating loops are set to 0. This situation will remain in effect until the power failure recovery period for this controller is over.
Applications Using Auxiliary Points lt is possible to have extra points available on a Heat Pump Controller—Multi-Stage in addition to the ones used by the current application that is running in the controller. If these extra points will be controlled by a field panel, they must be unbundled at the field panel. Siemens Building Technologies, Inc.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Application 2583: Multiple Compressor Heat Pump with Reversing Valve Control and Mixed Air Control In Application 2583 (Figure 5), the controller controls a multi-stage heat pump with a reversing valve controlled by the heat pump controller. In addition to compressors, this heat pump may also be equipped with electric heat for auxiliary heat and mixed air control for free cooling.
Applications 4. In this application, the maximum configurations are as follows: • The maximum of CMP TOTL = 3. • The maximum of EHTG STG CNT = 3. • The maximum of CMP TOTL plus EHTG STG CNT = 4. If these limits are exceeded, CMP TOTL will be set to 0 and EHTG STG CNT will be set to 0. These points will remain at 0 until they are set correctly. This prevents the application from trying to use the same DO as both a compressor and a stage of electric heat.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Application 2584: Multiple Heating and Cooling Heat Pump with Mixed Air and Internal Reversing Valve Control ln Application 2584, (Figure 6) the controller controls one or two heating compressors for heating and one or two cooling compressors for cooling. The reversing valve is controlled internally by the heat pump.
Applications SUPPLY AIR COMPRESSOR 2 COMPRESSOR 1 REVERSING VALVE* REVERSING VALVE* ELECTRIC HEAT (OPTIONAL) HEATING / COOLING O.A. N.C. COIL COIL O.A. DAMPER** (OPTIONAL) FAN N.O. WATER SOURCE MIXED AIR TEMPERATURE SENSOR (OPTIONAL) COIL COIL R.A. R.A. DAMPER** (OPTIONAL) * CONTROLLED INTERNALLY BY THE HEAT PUMP ** THE O.A. AND R.A. DAMPERS MUST BE MECHANICALLY LINKED.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Application 2590: BACnet Heat Pump Slave Mode Application 2590 is the default slave mode application that comes up when power is first applied to the controller. Slave mode provides no control. lts 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, APPLlCATlON, etc.).
Applications Siemens Building Technologies, Inc.
3 Point Database Overview This chapter presents a description of the Siemens BACnet Heat Pump Controller—MultiStage point database including point descriptors, point addresses, and a listing of applications in which each point is found. Description Address Application CTLR ADDRESS 01 2583, 2584, 2590 ldentifies the controller on the FLN trunk. APPLICATION 02 2583, 2584, 2590 Identification number of the program running in the controller.
Point Database Description Address Application Description RM STPT MlN 11 2583, 2584 Minimum temperature setpoint in degrees that the controller can use from the setpoint dial. This overrides any temperature setpoint from the setpoint dial that falls below this minimum. Valid entry range: 48° to 95°F (9° to 35°C) RM STPT MAX 12 2583, 2584 Maximum temperature setpoint in degrees that the controller can use from the setpoint dial.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Description Address Application Description Dl OVRD SW {19} 2583, 2584, 2590 Actual indication of the status of the override switch (not physically available on all temperature sensor models) at the room temperature sensor. ON indicates that the switch is being pressed. OFF indicates that the switch is released.
Point Database Description Address Application {29} 2583, 2584, 2590 CLG CMP1 ON 30 2584 Value, in percent, that the cooling temperature control loop output must exceed for cooling compressor 1 to turn ON. Actual turn on is subject to the CLG1 MlN OFF time being expired. CLG CMP1 OFF 31 2584 Value, in percent, that the cooling temperature control loop output must go below for cooling compressor 1 to turn OFF. Actual turn off is subject to the CLG1 MlN ON time being expired.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Description Address Application DO 1 {41} 2583, 2584, 2590 Digital output 1 controls a 24 Vac load with an ON or OFF status. If Motor 1 is enabled, DO 1 is coupled with DO 2 to control an actuator. DO 2 {42} 2583, 2584, 2590 Digital output 2 controls a 24 Vac load with an ON or OFF status. lf Motor 1 is enabled, DO 2 is coupled with DO 1 to control an actuator.
Point Database Description Address Application Description DMPR POS {49} 2583, 2584 Current position of the damper motor in percent of full travel. This value is calculated based on motor run time. MTR1 POS {49} 2590 Current position of the damper motor in percent of full travel. This value is calculated based on motor run time. See MTR1 TIMING. DO 8 {50} 2590 Digital output 8 controls a 24 Vac load with an ON or OFF status. FAN {50} 2583, 2584 Digital output used to control the fan.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Description CYCLE FAN Address Application Description 60 2583, 2584 YES indicates that the fan should cycle ON and OFF with the compressor during day mode. NO indicates that the fan should remain ON constantly in day mode. Valid input: YES or NO NOTE: In either case, the fan will cycle during night mode. FREE CLG ON 61 2583, 2584 Value, in percent, that the cooling loopout must exceed for free cooling to turn ON.
Point Database Description Address Application HTG LOOPOUT {80} 2583, 2584 ELEC HEAT ON 81 2584 Value, in percent, that the heating Ioopout must exceed for the electric heat to turn ON. EHEAT 1 ON 81 2583 Value, in percent, that the heating loopout must exceed for the first stage of electric heat to turn ON. CMP1 ON 82 2583 Value, in percent, that the active temperature control loop output must exceed for compressor 1 to turn ON.
Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual Description Address Application Description SWITCH DBAND 90 2583, 2584 Temperature range in degrees that is compared to the difference between CTL TEMP and CTL STPT. The difference must exceed this value for temperature control mode to change over. Changeover is also subject to the active temperature control loop output being below SWITCH LIMIT and SWITCH TIME being expired.
Point Database Siemens Building Technologies, Inc.
4 Troubleshooting This chapter describes corrective measures you can take should you encounter a problem when using a Siemens BACnet Heat Pump Controller—Multi-Stage. 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.
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. Al Analog Input. Point that receives a signal that represents a condition which 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). airflow Rate at which a volume of air moves through a duct.
Glossary control loop PID algorithm that is used to control an output 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 Heat Pump Controller - Multi-Stage Owner’s Manual lps Liters per Second. loopout The output of the control loop expressed as a percentage. 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 stand-alone control Type of control offered by a controller that is providing independent DDC control to a space. Equipment Controller Siemens Building Technologies, Inc. product family of equipment controllers (one is the BACnet Heat Pump 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.
Index A actuator .............................................................. 4 address descriptions ........................................ 18 AI (see analog input) ........................................ 30 airflow ............................................................... 30 algorithm .......................................................... 30 analog input ........................................................ 2 analog input (Glossary) .................................... 30 analog output ..
Index relay module ................................................... 5 hardware, inputs and outputs............................. 2 heat pump controller—multi-stage ..................... 1 I inputs and outputs analog ............................................................. 2 digital .......................................................... 2, 3 hardware......................................................... 2 L Light Emitting Diodes (LEDs) .......................4, 29 BST .......................
