Titus BAC-8005 Alpha VAV Controller Installation Guide

Titus BAC-8005 Alpha VAV Controller

Product Information

• The Titus Alpha BAC-8005 and BAC-8205 VAV Controllers are compliant with BACnet MS/TP standards.
• Standard VAV control sequences are incorporated to provide pressure independent control of VAV units.
• The controllers come with five reheat applications included.
• On-board airflow sensor for use with a single or multi-point differential pressure measuring station or pitot tube.
• All inputs are configured as analog objects.
• The controllers come with 60 analog, 32 binary, and 12 multistate program areas.
• Programs and program parameters are stored in nonvolatile memory with an auto restart feature in case of power failure.
• The controllers can be used for dual-duct VAV applications such as cooling VAV with modulating, time proportional, two-stage, three-stage, and tri-stage reheat.
• The airflow sensor is configured as a BACnet analog input object and has a CMOS differential pressure 0-2 inches of water (0-500 Pa) measurement range. The span accuracy is 4.5% of reading.
• The controllers come with 90 second actuator and reheat for the BAC-8005 model and 60 second actuator, reheat, and UL 864 smoke control application for the BAC-8205 model.

Product Usage Instructions

Before installing or operating the controllers, review the safety information provided in the user manual. Follow the steps below to install and set up the Titus Alpha BAC-8005 and BAC-8205 VAV Controllers:

1. Install the controllers according to the instructions provided in Section 2 of the user manual.
2. Set up the VAV controllers by following the steps outlined in Section 3 of the user manual.
3. The controllers can be used for dual-duct VAV applications such as cooling VAV with modulating, time proportional, two-stage, three-stage, and tri-stage reheat. Monitor CO2 to control indoor air quality, control local lighting with motion sensing, and fan control. For the BAC-8205 model, use the UL 864 smoke control application as well.
4. The airflow sensor can be used with a single or multi-point differential pressure measuring station or pitot tube. It is configured as a BACnet analog input object and has CMOS differential pressure 0-2 inches of water (0-500 Pa) measurement range. The span accuracy is 4.5% of reading. Make sure to connect the barbed connections for 1/4 FR tubing appropriately and note that the range is dependent upon DP pickup, tubing size/ length and connections.

About the controllers

This section provides a description of the Titus Alpha Controller BAC-8005 and BAC-8205 VAV controllers. It also introdeces safety information. Review this material before installing or operating the controllers.
The BAC-8005 and BAC-8205 are native BACnet, direct digital controllers designed for VAV terminal units. An integrated actuator and the supplied programs make these ideal controllers for temperature setback, overrides, reheat and other HVAC sequences. Install these versatile controllers in stand- alone environments or networked to other BACnet devices. As part of a complete facilities management system, the BAC-8005 and BAC-8205 controllers provide precise monitoring and control of connected points.

• BACnet MS/TP compliant
• Standard VAV control sequences are incorporated to provide pressure independent control of VAV unit
• Five reheat applications included
• On-board airflow sensor for use with a single or multi-point differential pressure measuring station or pitot tube.
• Control local lighting

Specifications

• Analog inputs             All inputs are configured as analog objects

• Active inputs                 1

• Passive inputs                 3

• Air flow sensor               1

• Key features                   Standard units of measure.
  Overvoltage input protection

• Connector                       Spade connectors, 0.25 inch

• Conversion                    12–bit analog–to–digital conversion

• Input range                    0–12 volts DC

• Outputs, analog            2

• Key features                    Output short protection
  Configured as BACnet analog objects. Standard units of measure

• Connector                        Spade connectors, 0.25 inch

• Conversion                       12–bit analog–to–digital conversion

• Output voltage                  0–10 volts DC

• Output current           30 mA per output, 30 mA total for all analog outputs

• Outputs, binary          4 triacs for external equipment 2 for the internal actuator

• Key features                Optically isolated triac output

• Conversion                 12–bit analog–to–digital conversion

• Connector                   Spade connectors, 0.25 inch

• Output range               Maximum switching 24 VAC at 3 amperes

Communications

• BACnet MS/TP    EIA–485 operating at rates up to 76.8 kilobaud.
  Removable screw terminal block. Wire size 12–24 AWG

• Sensor jack     RJ-45 jack compatible with model STE-8000 and STE-6000 models with RJ-45 jacks

• Supported objects    See PIC statement for supported BACnet objects

• Control Basic              5 program areas in BAC-8005 6 program areas in BAC-8205

• PID loop objects         2

• Value objects                60 analog, 32 binary, and 12 multistate

• Memory                       Programs and program parameters are stored in nonvolatile memory. Auto restart on power failure

• Applications programs   Titus Controls supplies the BAC-8×07 with programming sequences for dual-duct VAV applications:

• Cooling VAV with modulating, time proportional, two-stage, three-stage, and tri-stage reheat

• Monitor CO2 to control indoor air quality

• Control local lighting with motion sensing

• Fan control

• Balancing

• UL 864 smoke control (BAC-8205 only)

• Airflow sensor features    Configured as BACnet analog input object. CMOS differential pressure 0-2 inches of water (0-500 Pa) measurement range. Internally linearized                                               and temperature compensated. Span accuracy 4.5% of reading. Barbed connections for 1/4 FR tubing. Range dependent upon DP pickup,                                                     tubing size/ length and connections.

Actuator specifications

• Torque                                40 in-lb. (4.5 N•m)

• Angular rotation                0 to 95°
  Adjustable end stops at 45° and 60° rotation

• Motor timing, BAC-8005    90 sec./90° at 60 Hz
  108 sec./90° at 50 Hz

• Motor timing, BAC-8205    60sec./90° at 60 Hz
  72 sec./90° at 50 Hz

• Shaft size          Directly mounts on 3/8 to 5/8 inch (9.5 to 16 mm) round or 3/8 to 7/16 inch (9.5 to 11 mm) square damper shafts.

• Regulatory      UL 916 Energy Management Equipment FCC Class B, Part 15, Subpart B BACnet Testing Laboratory listed as an application specific controller (ASC).
  UL 864 smoke controls (BAC-8205 only)

Installation

• Supply voltage          24 volts AC, -15%, +20% 5 VA
• Weight                      13.2 ounces (376 grams)
• Case material              Flame retardant plastic

Environmental limits

• Operating                  32 to 120° F (0 to 49° C)
• Shipping                    –40 to 140° F (–40 to 60° C)
• Humidity                    5–95% relative humidity (non-condensing)

Models

• BAC-8005                   Cooling VAV controller with 90 second actuator and reheat
• BAC-8205                   Cooling VAV controller with 60 second actuator, reheat, and UL 864 smoke control application

Dimensions

BAC-8000 dimensions

Accessories

Power transformer

• XEE-6111-40   Transformer, 120-to-24 VAC, 40 VA, single-hub
• XEE-6112-40   Transformer, 120-to-24 VAC, 40 VA, dual-hub
• XEE-6112-100   Transformer, 120-to-24 VAC, 96 VA, dual-hub (the XEE-6112-100 must be used in smoke control applications)

Surge suppressors

• HPO-xxx        BAC-8000 input transient suppressor board
• HPO-xxx        BAC-8000 output transient suppressor board
• KMD-5567      EIA-485 surge suppressor

Connectors and bulbs

• xxx-xxx-xxx    Replacement three-pin removable terminal block
• HPO-0054      Replacement bulb
• HPO-0063        Replacement two-pin jumper

Safety considerations
Titus assumes the responsibility for providing you a safe product and safety guidelines during its use. Safety means protection to all individuals who
install, operate, and service the equipment as well as protection of the equipment itself. To promote safety, we use hazard alert labeling in this manual. Follow the associated guidelines to avoid hazards.

Danger
Danger represents the most severe hazard alert. Bodily harm or death will occur if danger guidelines are not followed.

Warning
Warning represents hazards that could result in severe injury or death.

Caution
Caution indicates potential personal injury or equipment or property damage if instructions are not followed.

Note
Notes provide additional information that is important.

Detail
Provides programing tips and shortcuts that may save time.

Installing the controllers

This section provides important instructions and guidelines for installing the BAC-8005 and BAC-8205 controllers. Carefully review this information before installing the controllers.
Installing a VAV controller includes the following topics that are covered in this section.

• Setting the rotation limits
• Mounting
• Connecting inputs
• Connecting outputs
• Connecting to an MS/TP network
• Connecting an airflow sensor
• Connecting power

In addition to the topics, see the section Application drawings.

Setting the rotation limits

Before mounting the controller, set the rotation limits with the supplied stop screw. Installing the stop screw limits the shaft rotation to either 45 or 60 degrees.
Caution
Before setting the rotation limits on the controller, refer to the damper position specifications in the VAV control box to which the controller will be attached. Setting rotation limits that do not match the VAV damper may result in improper operation or equipment damage. To set the rotational limits:

1. Turn the controller over so you have access to the back.
2. Manually rotate the actuator fully clockwise as viewed from the back.
3. Remove the stop screw from its storage location and clean any debris from the threads.
4. Insert the screw into the correct stop position hole.
5. Tighten the screw only until the head touches the plastic in the bottom of the recess.

Mounting

Mount the controller inside of a metal enclosure. To maintain RF emissions specifications, use either shielded connecting cables or enclose all cables in conduit.
Mount the controller directly over the damper shaft. A minimum shaft length of 2.0 inch (51 mm) is required.
Note
The controller is designed to directly mount to 3/8 to 5/8 inch (9.5 to 16mm) round or 3/8 to 7/16 (9.5 to 11mm) square damper shafts.
Mount the controller close enough to the pitot tubes to keep the tubing length to a minimum. In typical installations the controller’s inputs and sensors are within 24 inches of each other.
Mount the controller as follows:

1. Loosen the nuts on the U-bolt until the shaft can fit through the collar.
2. Place the controller on the damper shaft in the approximate final position. Position the controller loosely against the mounting surface so that the mounting bushing can float freely in the mounting tab.
3. Center the mounting bushing in the slot of the mounting tab and secure it using a #8 self-tapping screw.
4. Manually position the damper in the full open position.
5. Adjust the drive hub as follows:
   • If the damper rotates counter clockwise to close, depress the gear disengagement button and rotate the drive hub to the full clockwise position then release the button.
   • If the damper rotates clockwise to close, depress the gear disengagement button and rotate the drive hub to the full counter clockwise position then release the button.
6. Lock the hub to the shaft by evenly tightening the V-bolt nuts to 30 to 35 in-lbs.

Connecting inputs

The BAC-8005 and BAC-8205 controllers have preconfigured analog inputs to support the supplied programs. The inputs cannot be changed to binary or accumulator inputs. Only one input has an externally available physical terminal. All of the inputs are preconfigured for the application programs supplied in the controllers.

Discharge air temperature Connect a 10k , Type 3 thermistor temperature probe to the discharge air temperature input. The input includes the internal pull- up resistor. An STE-1405 sensor is suitable for this application. Follow the instructions supplied with the sensor for installation. See Setting temperature setpoints on page 30 for setting up discharge air temperature limiting that requires this input sensor.
Discharge air temperature
Space Temperature Input The space temperature input is connected only through the RJ-45 thermostat and sensor input jack. It is a configured as an analog input for STE-6010, STE-6014, and STE-6017 sensors. If an STE-8000 sensor is connected to the controller, this input is ignored. See Connecting to sensors
Space Setpoint The space setpoint input is connected only through the RJ-45 thermostat and sensor input jack. It is a configured for the setpoint dials on STE-6014 or STE-6017 sensors. If an STE-6010 or STE-8000 sensor is connected to the controller, this input is ignored. See Connecting to sensors.
Primary Duct Pressure The primary duct pressure input is an internal measurement from the airflow sensor.
Primary Damper Position (BAC-8205 only) The primary damper position input is preconfigured as an analog input that represents the position of the internal damper.

Connecting outputs

The BAC-8005 and BAC-8205 controllers have eight preconfigured outputs to support the supplied programs. Only six have externally available physical terminals. All of the outputs are preconfigured for the application programs supplied in the in the dual-duct controllers and .

Object| Function| Name| False value| True value| Default value| Type
---|---|---|---|---|---|---
BO1| Damper Clockwise| DAMPER CW| Neutral| Clockwise| Neutral| Internal
BO2| Damper Counter Clockwise| DAMPER CCW| Neutral| Counterclockwise| Neutral| Internal
AO3| Analog Heat| ANALOG HEAT| | | 0| 0-10 VDC
AO4| Fan Speed| FAN SPEED| | | 0| 0-10 VDC
BO5| Fan| FAN| On| Off| Off| Triac
BO6| Heating Stage 1| HT STAGE 1| | | | Triac
BO7| Heating Stage 2| HT STAGE 2| | | | Triac
BO8| Heating Stage3/Lite| HT STAGE 3/LITE| | | | Triac

Damper Clockwise and Clockwise
The damper outputs are binary output objects that control the motion of the internal damper.

Analog Heat
The analog heat output controls modulating analog reheat. This output is active only if the controller is set up for reheat. For staged reheat applications, see the topic Application drawings

Modulating heat output
Fan Speed Controls the speed of a variable speed fan if the controller is set up for fan operation. Fan speed output
Fan The fan start output is preconfigured to either start or stop a single speed fan or enable a multispeed fan. The output is a triac that can switch up to 1 ampere at 24 volts AC.
Fan start output
Heating stages 1, 2, and 3 The three heating outputs are for various types of reheat. The connection diagrams for each type of reheat are covered in the following topics.

• Modulating reheat
• Two-stage reheat
• Time proportional reheat
• Floating reheat
• Three stage reheat

When local lighting controls is used, three stage reheat is not available.
Local lighting The lighting output is preconfigured to work with the motion sensor in an STE-8201 sensor to automatically control lights located in the same space as the VAV. The output is a triac that can switch up to 1 ampere at 24 volts AC.

Lighting output

Connecting to sensors

Connect any of the following sensors to the RJ-45 thermostat and sensor jack.

• STE-8001
• STE-8201
• STE-6010
• STE-6014
• STE-6017

Link the controller to sensors with standard straight-through Ethernet cables up to 75 feet long. See the installation guide supplied with the sensors for complete sensor installation instructions.

Connecting to a sensor No programming or configuration is required for the supported sensors. The controller is configured to automatically detect which type of sensor is connected to it.

Connecting to an MS/TP network
The BAC-8000 series controllers are BACnet MS/TP compliant controllers. Connect them only to a BACnet MS/TP network.
See Application Note AN0404A, Planning BACnet Networks for additional information about installing controllers.

MS/TP network connection
Connections and wiring
Use the following principles when connecting a controller to an MS/TP network:

• Connect no more than 128 addressable BACnet devices to one MS/TP network. The devices can be any mix of controllers or routers.
• To prevent network traffic bottlenecks, limit the MS/TP network size to 60 controllers.
• Use 18 gauge, twisted pair, shielded cable with capacitance of no more than 51 picofarads per foot for all network wiring. Belden cable model #82760 meets the cable requirements.
• Connect the -A terminal in parallel with all other – terminals.
• Connect the +B terminal in parallel with all other + terminals.
• Connect the shields of the cable together at each controller. For KMC BACnet controllers use the S terminal.
• Connect the shield to an earth ground at one end only.
• Use a KMD–5575 repeater between every 32 MS/TP devices or if the cable length will exceed 4000 feet (1220 meters). Use no more than four repeaters per MS/TP network.
• Place a KMD–5567 surge suppressor in the cable where it exits a building.

MS/TP network wiring
Note
The MS/TP terminals are labeled -A, +B and S. The S terminal is provided as a connecting point for the shield. The terminal is not connected to the ground of the controller. When connecting to controllers from other manufacturers, verify the shield connection is not connected to ground.

End of line termination switches
The controllers on the physical ends of the EIA-485 wiring segment must have end-of-line termination installed for proper network operation. Set the end- of-line termination to On using the EOL switches.

End of line termination

the position of the BAC-8000 End-of-Line switches associated with the MS/TP inputs.

Location of EOL switch
Connecting an airflow sensor
An airflow sensor is incorporated as one of the inputs to the controller. Remove the plugs and connect the tubing from the pitot assembly to the airflow sensor inputs next to the drive hub. (See Illustration 2-13). The airflow sensor is programmed as Input 4.

Airflow sensor inputs
Connecting power
The controllers require an external, 24 volt, AC power source. Use the following guidelines when choosing and wiring transformers.

• Use a Class-2 transformer of the appropriate size to supply pwer to the controllers. Titus recommends powering ony one controller from each transformer.
• Do not run 24 volt, AC power from within an enclosure to external controllers.

Power terminals and jumper
Connect the 24 volt AC power supply to the power terminal block on the lower right side of the controller near the power jumper. Connect the ground side of the transformer to the ground terminal and the AC phase to the phase ~ terminal. Power is applied to the controller when the transformer is powered.

Power connections
Application drawings
The BAC-8005 and BAC-8205 VAV controllers include several options for reheat. The following application drawings show the connections for each type of reheat.

• Modulating reheat
• Two-stage reheat
• Time proportional reheat
• Floating reheat
• Three stage reheat

Modulating reheat
When modulating reheat is selected, local lighting is also available. The analog reheat output varies between 0 and 10 volts DC. Two-stage reheat
Two stage electric reheat connects to the triac outputs at BO6 and BO7. Local lighting is also available. The reheat and lighting outputs are triacs that can switch up to 1 ampere at 24 volts AC. Time proportional reheat
Time proportional reheat option is typically used in hydronic systems with a hot water reheat coil and a wax top control valve. The reheat and lighting outputs are triacs that can switch up to 1 ampere at 24 volts AC.
Floating reheat
Use the tristate reheat option in hydronic systems that are controlled by a tristate actuator. The reheat and lighting outputs are triacs that can switch up to
1 ampere at 24 volts AC.
Three stage reheat
Three stage electric reheat connects directly to reheat units that can be controlled with 24 volts AC. If local lighting is enabled only two stage reheat is available.

Setting up VAV controllers

The topics in this section cover setting up the BAC-8005 and BAC-8205 for controllers for VAV operation. These are advanced topics for controls technicians and engineers.
The BAC-8005 and BAC-8205 VAV controllers are set up by the manufacturer to operate as soon as they are connected to external equipment and power is applied. Installation and connection instructions are covered in the section Installing the controllers.
Setting up the controllers may include setting BACnet objects with a BACnet Operator Workstation such as Total Control. The objects may also be set up with a STE-8001 or STE-8201. The following topics are covered in this section.

• Setting temperature setpoints
• Setting airflow setpoints
• Setting the VAV terminal unit parameters
• Setting up local lighting control
• Network communications

Caution
Change only the present values of the objects listed in this section. Changing any other objects or properties will result in improper operation.

Network communications

Before connecting the controller to a BACnet MS/TP network, configure the following network parameters with either a BACnet operator workstation or temporarily connecting an STE-8001 or STE-8201 to the controller.
Device instance—Set from 0 to 4,194,302. A device instance number must be unique across the BACnet internetwork.
Baud—Valid baud settings are 9600, 19200, 38400, and 76800.
MAC—Set from 0 to 127. Must be unique on the MS/TP network to which the controller is connected.

Setting temperature setpoints

The space temperate setpoints listed in Table 3-1, “Temperature setpoints,” on page 30 are used to control the controller VAV operation. The temperature setpoints have default values, but may be manipulated depending on which type of wall sensor is connected to the controller.
Occupied cooling and heating setpoints These setpoints are user controlled space setpoints that originate from an attached sensor. If no sensor is attached the values for these setpoints are manually entered by a controls technician.
Unoccupied cooling and heating setpoints The unoccupied setpoints are manually entered values to set the heating and cooling temperature when the space is unoccupied.
Minimum cooling setpoint A manually entered value to limit the occupied cooling setpoint regardless of the value entered by the user.
Maximum heating setpoint A manually entered value to limit the occupied heating setpoint regardless of the value entered by the user.
Minimum setpoint differential Sets the minimum temperature separation between occupied heating and cooling setpoints.
Standby differential This differential is added or subtracted from the occupied temperature setpoints to calculate the standby setpoints.
SAT changeover temperature Sets the supply air temperature at which the controller will change from heating to cooling. The changeover takes place when the supply air temperature is 2° above or below the discharge air temperature setpoint.
Temperature setpoints

Setting airflow setpoints

The airflow setpoints are limits for VAV unit operation. All values are entered by a controls technician.
Minimum and maximum cooling airflow Sets the airflow limits through the VAV unit when in the cooling mode.
Minimum and maximum heating airflow Sets the airflow limits through the VAV unit when in the heating mode.
Minimum and maximum fan speed Sets the limits on the fan speed.

Setting the VAV terminal unit parameters

Terminal unit parameters set basic operating parameters and enable options such as reheat and series or parallel fan operation.

Reheat
Enables and sets the type of reheat. Choose from the available types of reheat from the following list. All reheat options except modulating reheat use the 24-volt AC triac outputs.

• None—Reheat is not enabled.
• Staged, with lighting—If lighting is enabled the staged reheat is set to two stages.
• Staged, without lighting—If lighting is not enabled, three reheat stages are available.
• Modulating—The reheat output varies from 0-10 volts.
• Floating—The reheat outputs control a tristate actuator.
• Time proportional—Controls a thermal wax valve with a 24-volt triac output.

Reheat equipment is connected to the controller as described in the topic Connecting outputs on page 15 and Application drawings on page 23.
Damper direction to close Defines which direction the damper will turn to decrease airflow.

• CCW—The actuator turns counterclockwise to close the damper.
• CW—The actuator turns clockwise to close the damper.

Primary duct K-factor
A property of the specific VAV unit and airflow sensor to which the primary controller is attached. This constant is supplied by the VAV unit manufacturer.

Fan operation
Sets the type of VAV fan in the VAV terminal unit.

• None—No fan is connected to the controller.
• Series—The VAV unit includes a series fan. The fan runs during a fresh air purge, when the space is occupied or in standby.
• Parallel—The VAV unit includes a parallel fan. The fan runs when there is a call for heat during a fresh air purge, when the space is occupied, or in standby.

Unit parameters

Setting up local lighting control

Automatic local lighting can controlled by the motion sensor in an STE-8201 connected to the controller. Local lighting is set up either with software or an attached STE-8201.
Lighting control enable When enabled, local lights will be turned on or off based on motion detected by an STE-8201. If lighting control is enabled the staged reheat is limited to two stages.
Light off delay Sets the interval local lights will remain turned on after the last motion is detected by an STE-8201.
Local lighting options

Lighting equipment is connected to the controller as described in the topic Connecting outputs

Balancing airflow
An airflow balancing program is included in BAC-8000 series controllers.

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