Siemens BACNET 125-699 User manual

Siemens Building Technologies, Inc. i
Siemens BACnet Heat
Pump Controller – Multi-
Stage Owner’s Manual
125-699 Rev. BA, July 2009

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.
WARNING
This equipment generates, uses, and can radiate radio frequency energy and if not installed and used in accordance
with the instructions manual, may cause interference to radio communications. It has been tested and found to
comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to
provide reasonable protection against such interference when operated in a commercial environment. Operation of
this equipment in a residential area is likely to cause interference in which case users at their own expense will be
required to take whatever measures may be required to correct the interference.
SERVICE STATEMENT
Control devices are combined to make a system. Each control device is mechanical in nature and all mechanical
components must be regularly serviced to optimize their operation. All Siemens Building Technologies branch offices
and authorized distributors offer Technical Support Programs that will ensure your continuous, trouble-free system
performance.
For further information, contact your nearest Siemens Building Technologies, Inc. representative.
Copyright 2009 by Siemens Building Technologies, Inc.
TO THE READER
Your feedback is important to us. If you have comments about this document, please contact your local Siemens
Building Technologies representative.
CREDITS
Product or company names mentioned herein may be the trademarks of their respective owners
Pirnted in the U.S.A.

Siemens Building Technologies, Inc. I
Table of Contents
How to Use This Manual...............................................................................................III
Manual Organization..................................................................................................III
Manual Conventions ..................................................................................................III
Manual Symbols ........................................................................................................IV
Getting Help ...............................................................................................................IV
Product Overview .........................................................................................................1
Introduction...................................................................................................................1
Ordering Notes...........................................................................................................1
Hardware Inputs ........................................................................................................2
Analog .....................................................................................................................2
Digital ......................................................................................................................2
Hardware Outputs......................................................................................................2
Analog .....................................................................................................................2
Digital ......................................................................................................................3
Power Wiring ...........................................................................................................3
Communication Wiring ............................................................................................3
Controller LED Indicators...........................................................................................4
Temperature Sensors ................................................................................................4
Room Temperature Sensor.....................................................................................4
Mixed Air Temperature Sensor ...............................................................................4
Actuators....................................................................................................................4
Related Equipment..................................................................................................5
Applications...................................................................................................................7
Basic Operation.............................................................................................................7
Control Temperature Setpoints..................................................................................7
Day/Night Mode .........................................................................................................7
Night Mode Override Switch ......................................................................................7
Control Loops.............................................................................................................7
Mixed Air Control Loop............................................................................................7
Calibration..................................................................................................................8
Heating and Cooling Switchover ...............................................................................9
Electric Reheat...........................................................................................................9

Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual
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Compressor Operation ..............................................................................................9
Fan Operation ............................................................................................................9
Power Failure Recovery ............................................................................................10
Centralized Alarm Monitoring ....................................................................................10
Overriding DOs ..........................................................................................................10
Fail-safe Operation ....................................................................................................10
Using Auxiliary Points ................................................................................................11
Application 2583: Multiple Compressor Heat Pump with Reversing Valve Control and
Mixed Air Control..........................................................................................................12
Compressor Staging ..................................................................................................12
Reversing Valve Operation........................................................................................12
Application Notes .......................................................................................................12
Application 2584: Multiple Heating and Cooling Heat Pump with Mixed Air and Internal
Reversing Valve Control...............................................................................................14
Compressor/Electric Heat Staging ............................................................................14
Application Notes .......................................................................................................14
Application 2590: BACnet Heat Pump Slave Mode...................................................16
Using the Controller as a Point Extension Device .....................................................16
Point Database..............................................................................................................18
Overview ........................................................................................................................18
Troubleshooting............................................................................................................28
Basic Service Information ..........................................................................................28
Preventive Maintenance ............................................................................................28
Safety Features..........................................................................................................29
Controller LEDs..........................................................................................................29
Glossary.........................................................................................................................30
Overview ....................................................................................................................30
Index...............................................................................................................................34

Siemens Building Technologies, Inc. III
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.
Manual Organization
This manual contains the following chapters:
•Chapter 1 Product Overview, describes the hardware components and accessories
used with the controller.
•Chapter 2 Applications, describes the control applications available in the controller.
•Chapter 3 Point Database, defines the point database descriptors and includes
addresses and applications.
•Chapter 4 Troubleshooting, describes basic corrective measures to take should you
encounter a problem when using this controller. For issues not covered in this
chapter, contact your local Siemens Building Technologies representative.
•A Glossary describes the terms and acronyms used in this manual.
•An Index is provided to assist you in finding information.
Manual Conventions
The following table lists conventions used in this manual.
Convention Example
Actions that you should
perform are specified in
boldface font.
Type Ffor 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.
The Open Processor continuously executes a user-defined set of
instructions called the control program.

Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual
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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.
Getting Help
For more information about the Siemens BACnet Heat Pump Controller—Multi-Stage,
contact your local Siemens Building Technologies representative.

Siemens Building Technologies, Inc. 1
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). The controller hardware consists of the controller with cover and
mounting bracket.
Table 1. Siemens BACnet Heat Pump Controller – Multi-Stage Applications.
Application
Number Application Description
2583 Multiple Compressor with Reversing Valve and Mixed Air Control
2584 Multiple Heating and Cooling with Internal Reversing Valve
and Mixed Air Control
2590 Slave Mode
Ordering Notes
Siemens BACnet Heat Pump Controller – Multi-Stage 550-490

Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual
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24 V-AC RX TX BST
RTS
DO 1
NO C
DO 2
NO C
DO 3
NO C
DO 4
NO C
DO 5
NO C
DO 6
NO C + -+ -+ -
+ -
AI 3
+ -
AI 4
+ -
AO 3AO 2AO 1DI 6DI 2AI 5DO 8
NO C
DO 7
NO C
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 161 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
C H GND
TEC04XXR1
CONTROLLER
BOARD
MOUNTING
HOLE
(2)
MOUNTING
RAIL
POWER
TRUNK
TERMINATIONS
INPUT / OUTPUT TERMINATIONS
DO LEDS
RECEIVE LED, TRANSMIT LED, AND BST LED
FLN TRUNK
TERMINATIONS
ROOM TEMPERATURE
SENSOR / HMI PORT
COVER
1 2 1 2 3 4 5 6 7 8 9 101 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16
+-
FLN TRUNK
1 2 3 4
0
+-
Figure 1. Siemens BACnet Heat Pump ControlIer—Multi-Stage.
Hardware Inputs
Analog
•Mixed air temperature sensor (optional)
•Room Temperature Sensor (RTS)
•Room temperature setpoint dial (optional)
Digital
•Heat pump alarm (optional)
•Night mode override (optional)
•Wall switch (optional)
Hardware Outputs
Analog
•Damper actuator (spring return) (optional)

Product Overview
Siemens Building Technologies, Inc. 3
Digital Application
•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
•Stage 2 heating compressor (optional) 2584
Power Wiring
The controller is powered by 24 Vac. Power wiring connects to terminals on the controller
labeled “C” (Common) and “H” (Hot). An earth ground termination is also present. See Figure
3.
Communication Wiring
The controller connects to the field panel by means of a Field Level Network (FLN) trunk. See
Figure 4.
C H EGRND WHEN THIRD TER-
MINATION IS PRESENT
24 V COMMON
24 V HOT
E GRND
POWER TRUNK
TEC0471R2
TEC0528R1
TWISTED PAIR
3-WIRE FLN TRUNK
SHIELD
WIRENUT
REFERENCE
IS NOT SHIELD
REFERENCE CONNECTION ABSENT
IF 2-WIRE CABLE MUST BE USED
REFERENCE (EQUIPOTENTIAL)
GROUNDED AT SINGLE LOCATION
TYPICALLY AT FIELD PANEL
Figure 3. Power Wiring. Figure 4. Communication Wiring.

Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual
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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 Indicates the ON/OFF status of the DO associated with it. A
glowing LED indicates that the DO is energized.
Receive RX Indicates , when flashing, that the controller is receiving
information from the field panel.
Transmit TX Indicates, when flashing, that the controller is transmitting
information to the field panel.
Basic Sanity
Test
BST Indicates, when flashing ON and OFF once per second, that
the controller is functioning properly.
* Some LED labels may be hidden by the controller cover.
Temperature Sensors
An electronic Room Temperature Sensor (RTS) or an optional auxiliary temperature sensor
may be used with the Siemens BACnet Heat Pump Controller—Multi-Stage.
Room Temperature Sensor
The controller room temperature sensor connects to the controller by means of a cable
preterminated at both ends with a 6-conductor RJ-11 plug-in connector. See Figure 1 for the
location of the RTS/Human-Machine lnterface (HMl) port.
Mixed Air Temperature Sensor
The mixed air temperature sensor is a 10K Ωthermistor that connects to the controller at Al
5.
For more information about Siemens temperature sensors, contact your local Siemens
Building Technologies representative.
Actuators
The actuator used with the Siemens BACnet Heat Pump Controller—Multi-Stage may be an
optional floating control or 0 to 10V spring return electronic damper motor that is powered
through the controller to position an outside air damper.
For more information about Siemens actuators, contact your local Siemens Building
Technologies representative.

Product Overview
Siemens Building Technologies, Inc. 5
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 BACnet Heat Pump Controller - Multi-Stage Owner’s Manual
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Siemens Building Technologies, Inc. 7
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.
Control Temperature Setpoints
The controller maintains a specified temperature setpoint based on Day/Night mode, the
heating/cooling mode, and the setpoint dial (if used).
Day/Night Mode
The controller maintains the specified day setpoint temperature during daytime hours and the
specified night setpoint at night.
Night Mode Override Switch
If the RTS has an override switch, it can be used to command the controller into day mode
for an adjustable period of time. This only affects a controller in night mode.
Control Loops
Heating Loop –maintains room temperature setpoint by turning compressors and electric
heat stages on and off.
Cooling Loop – maintains room temperature setpoint by turning compressors on and off and
using free cooling (mixed air control) when available.
Mixed Air Control Loop
The heat pump is controlled by three Proportional, Integral, and Derivative (PID) control
loops; a cooling loop and a heating loop. This section describes the mixed air control loop.

Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual
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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.
•For a floating control damper the mixed air loop will control the damper through DO 1
and DO 2, and the analog output will be a spare.
CAUTION:
This application does not have built in low temperature detection for the mixed
air dampers. The low temperature detection is handled differently depending on
what type of damper is used (spring return or floating control).
Stand-alone low temperature detection is not possible with floating control
dampers. A program can be written in the field panel to close the damper when a
low temperature situation occurs. Contact your local Siemens Building
Technologies representative for more information.
Day Mode – When heating is required and the fan is on, the damper is set to minimum
position. If the fan is off, the damper is closed.
When cooling is required the damper will be modulated by the mixed air temperature control
loop. Damper position will not be set below minimum position to make sure that the
ventilation requirements are being met.
Night Mode – The damper is closed (0%) during night mode when cooling is not required
and/or mixed air control is not used at night.
Mixed Air Control - When cooling is required the damper will be modulated by the mixed air
temperature control loop.
If the cooling loop is between the limits for free cooling and all other conditions have been
met for enabling the mixed air loop, control depends on the following:
•If the cooling loop was previously higher than free cooling, the mixed air loop will
remain enabled.
•If the cooling loop was previously lower than free cooling, the mixed air loop will
remain disabled.
NOTE: This can happen in day or night mode.
Calibration
Floating Control Damper – The damper is briefly commanded closed to get an accurate
damper position during calibration.

Applications
Siemens Building Technologies, Inc. 9
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.
The heating loop controls up to three stages of electric reheat (Application 2583) or one
stage (Application 2584) to warm up the room. The electric reheat is cycled on and off based
on heating demand that is determined by the room temperature heating loop. When the
controller is in cooling mode, the electric heat is OFF at all times.
Compressor Operation
When in cooling mode, the output of the cooling loop controls the staging of the compressors
and enabling/disabling the mixed air control (used as a source of cooling when the outside air
temperature is cool enough.
When in heating mode, the output of the heating loop controls the staging of the compressors
or electric heat.
NOTE: Application 2583 only. When cooling or heating mode is opposite the reversing
valve control, the compressors are turned off.
Fan Operation
Day Mode – The fan can be set to run all the time or the same as night mode.
Night Mode – The fan is controlled as follows:
The fan will turn ON when at least one of the following two conditions has been met:
•Free cooling is provided by the mixed air control loop.
•At least one compressor or stage of electric heat is ON.
The fan will turn OFF only after the following two conditions have been met:
•Free cooling is not provided by the mixed air control loop.
•All compressors and stages of electric heat have been OFF for at least 30 seconds.

Siemens BACnet Heat Pump Controller - Multi-Stage Owner’s Manual
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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.
The controller returns to normal control when its power failure recovery period is over. The
power failure recovery time for a heat pump is based on the following formula:
RETURN DELAY + (CTLR ADDRESS × 10 seconds)
This lessens the demand of having all the electrical equipment starting at once.
Centralized Alarm Monitoring
DI 6 can be used to monitor an input that changes state when the heat pump is in alarm.
DI 6 can be unbundled to send alarm information to the field panel for centralized alarm
monitoring.
Overriding DOs
Heat Pump applications allow spare DOs, damper (DO1 and DO2) and electric heat stages
(DO3, DO6 and DO7 when applicable) to be commanded.
Physical points DO1 and DO2 can never be overridden when configured for motor control.
However, the position of the attached motor is always commandable via the DMPR COMD
point.
To prevent damage to the mechanical equipment, the fan, reversing valve, and
compressor(s) DOs cannot be directly commanded ON or OFF unless the point HP DO
OVRD is set to ENABLE. When HP DO OVRD is set to DISABL (default), commands to the
fan, reversing valve and compressor DO points are ignored regardless of BACnet command
priority.
CAUTION:
HP DO OVRD should be set to ENABLE only when there is a complete
understanding of the consequences. Since the direct control will override the
application minimum on/off time safeties, improper use of DO commands can
cause permanent equipment damage. Also, during normal daily operation the
override of critical DOs should only be done via a BACnet command.
Fail-safe Operation
If the RTS or the setpoint dial fails, the controller operates using the last known temperature
value.

Applications
Siemens Building Technologies, Inc. 11
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 BACnet Heat Pump Controller - Multi-Stage Owner’s Manual
12 Siemens Building Technologies, Inc.
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. The mixed air control can use either a spring return or a floating control damper
motor.
Compressor Staging
Three compressors or electric heat stages are available for use. Each compressor has a time
delay (at least 30 seconds) to lessen the demand of having more than one compressor stage
start at once.
Reversing Valve Operation
The reversing valve determines the operation of the heat pump's compressors (heating or
cooling) depending on the demand.
Application Notes
1. If the heat pump cycles excessively, temperature swings in the room are excessive, or
there is trouble maintaining the setpoint, the cooling loop, the heating loop, or both need
to be tuned. Contact your local Siemens Building Technologies representative for more
information.
2. The Heat Pump Controller—Multi-Stage, as shipped from the factory, keeps all
associated equipment OFF. The controller and its equipment are released to application
control at start-up.
3. Running the mixed air loop during night mode can increase energy savings by taking
advantage of free cooling at night to pre-cool the building for day mode, and, thereby,
reduce the need for mechanical cooling during day mode. This method for pre-cooling
the building can also improve indoor air quality because it is accomplished with fresh air.
A field panel program can be written to pre-cool the building with this application. Contact
your local Siemens Building Technologies representative for more information.