TRUEFIT BAC-5051A E Airflow Measurement System Router User Guide

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TrueFIT  

Airflow Measurement System  

BAC-5051(A)E Router  

Application Guide  

KMC Controls, 19476 Industrial Drive, New Paris, IN 46553 / 877-444-5622 / Fax: 574-831-5252 / www.kmccontrols.com  

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General	Details
Name	TRUEFIT BAC-5051A E Airflow Measurement System Router User Guide
Make	TRUEFIT
Language	English
Filetype	PDF (Download)
File size	0.2 MB

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• ALL WI-FI INSTRUCTIONS & USER MANUALS
• TRUEFIT

TRUEFIT BAC-5051A E Airflow Measurement System Router User Guide Overview

Summary of Contents

• Page 1: Airflow Measurement System BAC-5051(A)E Router Application Guide
• Page 2: Getting started Prerequisites Accessing the router's AFMS features Setting up an AFMS Setting AFMS parameters Before beginning Calibrating the AFMS's sensors Running AFMS learning mode Checking learn ready status Interpreting learn ready status Manually starting learning mode Enabling learning mode to auto start
• Page 3: Getting Started The BAC-5051E router can be used to configure, control, tune, and monitor the operation of an Airflow Measurement System (AFMS). AFMS features are accessible through the Balancing web page and are active only when a valid AFMS controller has been discovered. Prerequisites Install an AFMS (the controller and all system components). Select the application (on the AFMS controller) needed for the equipment. Caution: Select the application before configuring other settings. Changing applications after configuration will restore most parameters to their defaults. Complete basic configuration using a Conquest NetSensor, KMC Connect software, TotalControl software, and/or the KMC Converge module for Niagara WorkBench. Set the AFMS controller's communication parameters. Configure the router and set up routing. Accessing the Router's AFMS Features Use an Internet browser to log in. From the Advanced group, select Balancing. Enter a range of device instance values that include an AFMS controller. Select Discover.
• Page 4: Setting up an AFMS involves several key processes. To set up an AFMS using the router, complete the following processes in this order: Setting AFMS parameters. Calibrating the AFMS's sensors. Running AFMS learning mode. In environmental conditions where you can't run learning mode, refer to manually entering damper characterization data.
• Page 5: Before setting an AFMS's parameters in AFMS, ensure that the prerequisites have been met. Select the appropriate application on the AFMS controller before configuring other settings. Changing applications after configuration will restore most parameters to their defaults. For supply area, enter the measurement (in square feet) of the cross section where the supply airflow pickup tubes were installed. Choose to either leave enable low limit set to ON (the default), or to turn it OFF. ON is recommended to prevent freezing of equipment. Either leave low temp limit set to the default (37°F), or adjust the value. If the mixed air temperature reaches the low temp limit set here (and enable low limit is set to ON), the outside air damper will modulate toward closed to prevent freezing of the equipment. For stroke time (seconds), enter the time (in seconds) that it takes for the damper to go from 100% open to 100% closed. Select NORMAL if the greater the output signal to the damper actuator is, the more the damper opens. Select REVERSE if the greater the output signal to the damper actuator is, the more the damper closes. For actuator voltage, select the voltage range of the damper actuator (2 to 10 volts or 0 to 10 volts).
• Page 6: Before the AFMS controller can run Learning Mode, it must learn the minimum and maximum incline of the damper using the inclinometer. Select Save. Continue to Calibrating the AFMS's Sensors on page 7.
• Page 7: Calibrating the AFMS's sensors involves several steps. Select the Tune tab. Enter the CFM offset for the supply air pressure transducer, as determined by a TAB technician. Enter the multiplier for the supply air pressure transducer, also determined by a TAB technician. Enter the °F offsets for the outside, return, and mixed air temperature sensors, as determined by a TAB technician. Select Save. For more information on the AFMS's sensors, refer to the Airflow Measurement System Selection Guide. Continue to Running AFMS Learning Mode on page 8.
• Page 8: Before starting learning mode, ensure that the parameters are set correctly. The sensors must be calibrated. The supply air fan should be running at a normal, steady rate. If the unit has a heat recovery wheel, it should be turned off. Any heating or cooling sources located upstream of the MAT sensor must be turned off. If the unit has a bypass damper, it should be set to 100% open. To check learn ready status, select the Learn tab. If READY is reported, you may manually start learning mode. If NOT READY is reported, check for sensor faults and ensure learn damper span has completed. Mixed air temp low limit control may be active, which requires further action. Refer to the monitor for detailed information on faults. Consult the configuration settings for low limit guidance.
• Page 9: Check Min Delta Temp. If the current ΔT is less than the minimum difference allowed, continue to enabling learning mode to auto start. Go to Monitor to find outside air temp and return air temp. Calculate the absolute difference, then compare to Min Delta Temp. If Learn Ready reports READY, you may start learning mode manually. Leave Min Delta Temp set to the default, or adjust it if needed. Setting the Min Delta Temp at a 10°F or larger difference is recommended. Leave Time Between Samples (Seconds) set to the default, or adjust it if needed. Most often, this can be left on the default (60 seconds). For learning mode, select ON. Select Save. Wait for learning mode to complete. To calculate the total time that learning mode should take to complete, multiply Time Between Samples by 91, then divide by 60. If Learn Ready reports NOT READY because of currently unfavorable temperatures, you may enable the AFMS controller to automatically start learning mode when it detects favorable temperatures.
• Page 10: If the ΔT becomes less than the Min Delta Temp, the AFMS controller will abort Learning Mode to ensure that the controller does not receive unusable learning samples. 10°F or more Min Delta Temp is recommended. Leave Auto Start Delta Temp set to the default, or adjust it if needed. When the ΔT reaches the Auto Start Delta Temp, Learning Mode will start. An Auto Start Delta Temp that is at least 10°F more than Min Delta Temp is recommended. Leave Time Between Samples (Seconds) set to the default, or adjust it if needed. Most often, Time Between Samples (Seconds) can be left on the default (60 seconds). Increase the value if the damper Stroke Time (Seconds) is longer than that of a typical unit. For Auto Learn Enable, select ON. Select Save. See the Date of Last Learn and the OAT When Learned once Learning Mode has run automatically. The damper characterization data can be calculated and entered manually if the ΔT is unlikely to remain greater than the Min Delta Temp for the duration of Learning Mode.
• Page 11: Setting up an AFMS allows control of outside air flow and mixed air temperature. To control outside air flow, select the Configure tab and choose OA FLOW CTRL from the Control Mode dropdown menu. Enter an Outside Air Flow Setpoint in CFM and select Save. The outside air damper will modulate to maintain the Outside Air Flow Setpoint. If Enable Low Limit is ON and the mixed air temperature reaches the Low Temp Limit, the damper will modulate toward closed to prevent freezing. To control mixed air temperature, select Configure and choose MAT CTRL from the Control Mode dropdown menu. Enter a Mixed Air Temp Setpoint and select Save. The outside air damper will modulate to maintain the Mixed Air Temp Setpoint. To command a damper position, select Configure and choose DMPR POSITION CTRL from the Control Mode dropdown menu. Enter an Outside Air Damper Setpoint (0–100% open) and select Save. The control modes will only be active when the served space is occupied if an occupancy sensor is used.
• Page 12: The AFMS controller will command the damper to the outside air damper setpoint. If enable low limit is on and the mixed air temperature reaches the low temp limit, the damper will modulate toward closed to prevent freezing of the equipment. This control mode will only be active when the served space is occupied. To enable pass through, select configure from the tabs that appear. From the control mode drop-down menu, select pass through and then select save. The external controller will be allowed to control the damper actuator if the AFMS controller is wired to one. This control mode will only be active when learn damper span and learning mode are off. The enable low limit and low temp limit do not apply when in pass through. Ensure the external controller has its own low limit and other safeties configured to prevent equipment damage.
• Page 13: Monitoring with an AFMS Accessing Monitoring Select the Monitor tab. The AFMS controller's current outside air CFM calculation displays here. Normal = No faults are detected. Service = One or more faults are detected. The saved Control Mode displays here. The damper's percentage open displays here. If an occupancy sensor is used and the served space is vacant, UNOCCUPIED will display. Fault = The outside air temperature sensor is missing or shorted. Fault = The return air temperature sensor is missing or shorted. Fault = The mixed air temperature sensor is missing or shorted. If the saved Control Mode is DMPR POSITION CTRL, FAULT will display if the damper position is more than 15% off from the Outside Air Damper Setpoint.
• Page 14: If the saved control mode is MAT CTRL, FAULT will display if mixed air temp is more than 15°F off from the mixed air temp setpoint for longer than the stroke time. This indicates that the damper is not moving properly. The calculation of the airflow based on the damper characterization data has differed from the calculation using the current temperatures by more than the tolerance for longer than 10 minutes. Ensure that the equipment is in the same physical condition as it was when learning mode was run. The damper is modulating toward closed to prevent freezing of the equipment because the mixed air temp is lower than the low temp limit. Either the mixed air temp is higher than the low temp limit, or enable low limit is set to OFF.
• Page 15: Accessing the damper characterization table Manually entering damper characterization data can be calculated and entered manually in the AFMS Table. This should only be done if the ΔT is unlikely to be greater than the Min Delta Temp for the duration of Learning Mode. For reliability, running Learning Mode at a later available time is still recommended. Accessing the AFMS Table requires selecting the Tune tab. The AFMS Table includes percentage of supply airflow that is outside airflow at the given outside air damper position. The pressure differential at the given outside air damper position is also included in the AFMS Table. Calculating the damper characterization data involves using the %OA equation found in ASHRAE Standard 111, section 7.6.3.3.
• Page 16: Getting started on page 3 provides initial setup instructions. Refer to page 11 for guidance on controlling airflow with an AFMS. Instructions for setting the outside air damper positions are detailed on page 11. Page 13 contains information on monitoring with an AFMS and locating sensor readings. Verification of damper characterization data is necessary if discrepancies arise. Measurements for damper characterization must use NIST-traceable instruments. Follow the method outlined in ASHRAE Standard 111 for verification procedures. Details for manually entering damper characterization data can be found on page 15.
• Page 17: Important notices regarding trademarks, patents, terms of use, copyright, and disclaimers are included in this document. KMC Conquest™, KMC Controls®, and the KMC logo are registered trademarks of KMC Controls, Inc. All rights are reserved. The material in this document is for information purposes only and is subject to change without notice. KMC Controls, Inc. makes no representations or warranties with respect to this document. Specifications and design are subject to change without notice.