Delta Controls BACstat II Series Application Manual
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Delta Controls BACstat II Series Application Manual

Delta network sensor thermostat
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Product Description
The BACstat II is an intelligent 4-button room sensor/thermostat with a
custom 3-value, 96 segment LCD display that is used with Delta's product
line of BACnet Application Controllers. It is capable of displaying a wide
range of digital or analog values, and is capable of communicating on Delta's
proprietary LINKnet network or directly on a BACnet MS/TP network.
When connected to an Application Controller on a LINKnet network it
provides programmable remote sensor and expanded I/O capabilities to the
controller. When connected on an MS/TP network it functions as an
independent BACnet sensor device or a small local controller.
The DNS-24 model does not have additional I/O and built-in control strategies, while the DNT-T103 has 1
extra input, 3 binary outputs and a number of built-in application control strategies. The DNT-T221 has 2
extra inputs, 2 analog and 1 binary outputs and built-in application control strategies. As a result, the DNT-
T103 and DNT-T221 BACstats are capable of simple stand-alone control when directly connected on an
MS/TP network. When connected to a LINKnet network, the additional I/O may be MUXed or otherwise
controlled from the Application Controller it is connected to.
Contents
OTHER RELEVANT DOCUMENTS ................................................................................. 2
IMPORTANT INFORMATION.......................................................................................... 2
SETUP & CONFIGURATION ............................................................................................ 3
SOFTWARE & PROGRAMMING ..................................................................................... 9
CONTROL FUNCTIONS................................................................................................... 12
C
ONTROL
OWS FUNCTIONS ............................................................................................................. 30
Document Edition 3.1
Delta Network Sensor Thermostat: BACstat II
.......................................................................................... 3
) ...................................................................................... 6
......................................................................................................... 8
....................................................................................................... 8
............................................................................................................................ 9
............................................................................................................... 10
...................................................................................................................... 12
...................................................................................... 13
...................................................................................................................... 16
D
........................................................................................................ 17
IAGRAM
......................................................................................... 26
A
PPLICATION
DNS-24, DNT-T103, & DNT-T221
) ................................................................................. 3
G
UIDE
Document Edition 3.1
) .......................... 18
Page 1 of 35

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Summary of Contents for Delta Controls BACstat II Series

  • Page 1: Table Of Contents

    PPLICATION UIDE Delta Network Sensor Thermostat: BACstat II DNS-24, DNT-T103, & DNT-T221 Document Edition 3.1 Product Description The BACstat II is an intelligent 4-button room sensor/thermostat with a custom 3-value, 96 segment LCD display that is used with Delta’s product line of BACnet Application Controllers.

  • Page 2: Other Relevant Documents

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide Other Relevant Documents • Associated BACstat II Installation Guide (DNS-24, DNT-T103, DNT-221, etc.) • RS-485 Network Installation Guide (DOC818-11) • ORCAview Operator Guide • ORCAview Technical Reference Manual (particularly Appendix G) •...

  • Page 3: Setup & Configuration

    Delta Controls Setup & Configuration NETWORK COMMUNICATIONS On an MS/TP network BACstats communicate at a default speed of 76,800 bps. Refer to the ORCAview Technical Reference Manual for further detail on configuring the MS/TP network or changing baud rates, etc.
  • Page 4 Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide Use the N and P buttons to navigate through the menu options. Once you have navigated to the REVIOUS desired item you wish to display or change, use the arrow buttons to make any necessary changes. Once the changes are made or you wish to move on, press N or P REVIOUS...
  • Page 5 Delta Controls Menu Item Description The LCD Display Code Setting (AV15), a 4-digit value (ABCD) configures local display and button handling as follows: Line 1 (Top Left – i.e., Outside Value): 1 to 4 - Disabled - Value from AV5 (i.e., remote value such as OAT) - Value from AI2 (i.e., external sensor)

  • Page 6: Service Tool Mode (Keypad)

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide Menu Item Description The device Address (1 to 99), which is used internally as the MAC Address. As the BACstat can only be a Subnet device on MS/TP, this address is always mapped in as the Subnet value.
  • Page 7 Delta Controls Service Tool Main Menu Options Menu Item Description Displayed on line 2 of the LCD (center screen) to indicate you are at the Main menu of the Service Tool Mode. [Option] Service Tool Mode has these following main menu options, which you rotate through using the arrow keys.

  • Page 8: Input Calibration

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide INPUT CALIBRATION MS/TP CONNECTION The inputs are typically calibrated in their associated local AI objects. These same calibration fields are also mapped to variables (AV16 to 18) to provide access to other vendors in a multi-vendor installation, which can be also used to calibrate the inputs.

  • Page 9: Software & Programming

    Delta Controls Software & Programming OBJECTS The following is a list of predefined or “fixed” objects that reside in the BACstat II products, which you cannot create or delete. When connected to an MS/TP network, these objects are readily accessible over the network.

  • Page 10: Programming

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide : The DNS-24 model does not have any extra inputs, any outputs, and does not support control applications, so it only contains a subset of these objects (highlighted in bold). The DNT-T103 and DNT-T221 models support the full compliment.
  • Page 11 Delta Controls Object Name Description Creation LCDx01 LinkLCD# Object for BACstat LCD & Button Presses Automatic AIx01, 02, 03 [User Specified] Matching object for the Input Value Manually AVx01, 02, etc. [User Specified] Matching object for the corresponding AV Manually where “x”...

  • Page 12: Control Functions

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide Control Functions OVERVIEW (DNT-T103 DNT-T221 O ONTROL PPLICATIONS When connected to an MS/TP network, the DNT-T103 BACstat may configured to operate according to one of 8 possible application control strategies, and displayed in the Application variable (AV12).

  • Page 13: Software Loop Controller

    Delta Controls Lockout Modes Heating and cooling lockout modes are operational for all Control Applications. Basically, once a BACstat has been configured for various stages of heating and cooling, either the heating and/or cooling may be disabled on-the-fly as necessary for various control strategies simply by commanding the Alg.
  • Page 14 Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide ONTROLLER PERATION NORMAL CONTROLLER ACTION 100% -100% Controller Controller Output Output Differential (Heating) (Cooling) Deadband Heating Cooling Temperature Proportional Band Proportional Band Heating Cooling Setpoint Setpoint Day Setpoint Deadband is a span of 0.2 around setpoint (heating or cooling) over which neither heating nor cooling takes place.
  • Page 15 Delta Controls For VAV or VVT applications, when the Box Mode is changed to heating, cooling is inverted and used for controlling the flow damper as the first stage of heating, and the null zone is placed on the far right. Moving from right to left, away from setpoint, the Controller Status (AV14) will modulate from 0 to 200% and sequence all the necessary heating stages.

  • Page 16: Setpoints

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide SETPOINTS The BACstat II uses a series of setpoints for various purposes, most of which interact with one another. For a complete list of these setpoints and other objects and their defaults, refer to the Object table on page 9.
  • Page 17 Delta Controls Night Heating Setpoint (AV10) This is the setpoint used when in N mode and night setback heating is required. If the current IGHT temperature is below the current Day Setpoint when in N mode, this value will be displayed on the IGHT BACstat LCD (depending on how setpoint display has been defined by the Display Code).

  • Page 18: Control Applications (Mux , Vav, Vvt, Hpu, Fcu, Rad , Hum )

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide CONTROL APPLICATIONS (DNT-T103 and DNT-T221 Only) NONE (or MUX) – [Application (AV12) = 0] Function: No local control strategy, allowing the outputs (via AV1 to AV3) to be directly controlled from a remote device.
  • Page 19 Delta Controls For fan-powered boxes, series fans should always be configured for continuous OTES operation – never intermittent or the fan could run backwards on startup. When a parallel fan is used in a heating application it should be configured as the 1st stage of heating (and wired to the appropriate output accordingly), rather than as a fan output.
  • Page 20 Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide VVT – [Application (AV12) = 2] Function: Control of a simple VVT box with a Tri-State damper on Outputs 1 and 2 (for DNT-T103) or an analog damper on Output 1 (for DNT-T221), and various options on the remaining outputs (of which some options are no longer available in Release 3 firmware).
  • Page 21 Delta Controls Sequence of Operation The current damper position is generated from the Cooling Minimum setpoint, Cooling Maximum Setpoint and the Cool 1 value as shown on the next page. Max Damper Position Damper Position Damper Position Damper Position Controller Output (Cooling 1)
  • Page 22 Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide Setup Parameters Setup Variable Function Notes AV24 Binary Delay Transition Timer for Compressor AV25 AV26 Binary Delay Transition Timer for Rev. Valve AV27 AV28 PWM minimum value or Binary On Delay Depends on OP3 configuration AV29 PWM maximum value or Time Proportioned...
  • Page 23 Delta Controls (FCU) – [Application (AV12) = 4] Function: Control of a simple Fan Coil Unit with fan. DNT-T103 I/O (Outputs 1 to 3 are Triacs) Input AI1 Input AI2 Input AI3 Remote AV5 Output 1 Output 2 Output 3 Room Temp.
  • Page 24 Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide & R – [Application (AV12) = 5] ADIATION EHEAT Function: Control of simple single stage or multi-stage heating, typically using wall fin radiation or reheat. DNT-T103 I/O (Outputs 1 to 3 are Triacs) Input AI1 Input AI2 Input AI3...
  • Page 25 Delta Controls Setup Parameters Setup Variable Function Notes AV24 PWM minimum value or Binary On Delay Depends on OP1 configuration AV25 PWM maximum value Depends on OP1 configuration AV26 PWM minimum value or Binary On Delay Depends on OP2 configuration...

  • Page 26: Output Functions & Types

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide OUTPUT FUNCTIONS & TYPES (DNT-T103 and DNT-T221 Only) Regardless of model, any triac outputs are capable of switching up to 24 VAC at a maximum of 0.5 A each, and may be configured for any of a number of output functions and types.
  • Page 27 Delta Controls OWS Configuration It is of course possible to configure the outputs via ORCAview OWS, rather than through the keypad Configuration Menu at the BACstat. Variables AV21 to 23 are used to configure each of the three outputs, but you must configure these variables in the proper sequence (refer to page 30 for further information).
  • Page 28 Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide (TP) ROPORTIONED The DNT-T103 can have up to two stages of Time Proportioned heat (Outputs 2 and 3), while the DNT-T221 can have one stage (Output 3). These are similar to the PWM outputs except: •...
  • Page 29 Delta Controls The Algorithm estimates the position of the Tri-state device by mapping run time against desired percent open/closed. Therefore it is important to enter an accurate runtime parameter. The algorithm also has an internal dead band of 6% to minimize hunting of the valve position.

  • Page 30: Ows Functions

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide OWS Functions EVICE ONFIGURATION Although the BACstat was designed to be configured and commissioned using the keypad buttons right at the device without any additional software (via the Configuration Menu), it may also be configured using the ORCAview OWS, assuming the BACstat is connected to an MS/TP network (and not LINKnet).
  • Page 31 Delta Controls AI2 ( AI3) C ONFIGURATION While AI1 is typically configured from the Configuration Menu, by setting the Temperature Units setting (degrees C or F), additional inputs such as AI2 (and AI3 on the DNT-T221) are configured through the OWS.

  • Page 32: Appendix (Lcd Object Property Values & Programming Notes)

    Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide APPENDIX A. LCD Object Property Values (for GCL Programming) The following is a table of LCD object properties and associated values that can be used in GCL programming in a DAC/DSC product for BACstats when connected on its LINKnet network.
  • Page 33 Delta Controls Calibrate 0 = C text is turned off ALIBRATE 1 = C text is turned on ALIBRATE 0 = O text is turned off 1 = O text is turned on 0 = O text is turned off...
  • Page 34 Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide B. Programming Notes The following provides additional important programming information. (AV12 & AV21-23): These variables should never be commanded ONFIGURATION ARIABLES on-the-fly from a GCL program (or user command). They must be configured in the proper sequence and they radically alter operation too much to make frequent changes.
  • Page 35 Delta Controls [where AV104 is the mapped AV in the DAC associated with AV4 in BACstat #1] AV104 = 0 Page 35 of 35 Document Edition 3.1...

This manual is also suitable for:

Dnt-t103Dns-24Dnt-t221

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