KMC CONTROLS BAC-5901AC-AFMS BACnet AAC Airflow Measurement System Instruction Manual

BAC-5901AC-AFMS BACnet AAC Airflow Measurement System

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Airflow Measurement System
AFMS Controller, Sensors, and Actuator

DESCRIPTION

HOW IT WORKS

Building wellness and indoor air quality assurance is the current industry focus. Fresh air exchanges with conditioned outside air are a fundamental component of all major IAQ strategies. However, reliably measuring outdoor air can be challenging in many equipment types.
The KMC Airflow Measurement System (AFMS) reliably provides accurate outside, return, and supply airflow data for monitoring and control. The system delivers accurate, repeatable results on nearly any type of equipment, without the traditionally expected mechanical limitations, performance issues, or ongoing maintenance issues.
The system consists of the following components, installed on an AHU, RTU, or unit ventilator:
· One controller with airflow measurement programming
· One inclinometer (included with the controller) mounted on a horizontal outside or return air damper blade
· If only vertical damper blades, one HLO-1050 Linkage Kit
· At least two flow pickup tubes installed in the supply air duct, or on the fan inlet
· If a BAC-5901AC(E)-AFMS is used, one pressure transducer
· If pressure assist measurements are needed (for units with changing pressure in mixed and/or return air sections, or for units with more than one outside air damper), one additional pressure transducer, connected to two additional flow pickup tubes that are mounted on both sides of either the outside air damper or return air damper.
· Three temperature sensors (STE-1400 Series), for outside, mixed, and return air
· One proportional actuator mounted on the damper shaft

The system determines the proportion of outside versus return airflow with Characterized Airflow Performance®. The AFMS controller’s programming generates a characterization curve using a Learning Mode sequence. It does this by leveraging the relationship between the inclinometer and a mixed air equation from ASHRAE Standard 111. During Learning Mode, the damper is positioned at several points (gradually increased percentages of open, as measured by the inclinometer). At each point, the airflow and temperature readings are allowed to stabilize before being sampled and averaged. The controller uses those readings and the mixed air equation to calculate the fraction of OA/RA at each point. The results are recorded in a damper characterization table. Thereafter, the sensors are no longer needed to measure the airflow, but are left in place for fault detection and later recalibration.
FEATURES
· Measurements of outside, return, and supply airflow accurate within three percent
· Sensor and system fault detection for Title 24 compliance · Installs without restrictions of installation location
· Reduced system maintenance requirements
· AHU, RTU, and unit ventilator applications
· Applicable to both VAV and CAV systems
· Learning Mode started locally or remotely
· Four control modes: outside airflow, mixed air temperature, damper position, and pass through
· Interoperability with any BACnet open automation system

(See the KMC AFMS Selection Guide for details.)

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

EXAMPLE DIAGRAMS
Standard Application
REVISE
OAD Pressure Assist Application
2

RAD Pressure Assist Application

COMPONENTS

AFMS Controller with Inclinometer

Transducer (for BAC-5901AC(E)-AFMS only)

BAC-5901AC-AFMS

BACnet controller with real-time clock, MS/TP communication port, AFMS programming (standard and pressure assist), and inclinometer

BAC-5901ACE-AFMS BACnet controller with real-time clock, two Ethernet communication ports, AFMS programming (standard and pressure assist), and inclinometer

BAC-9311AC-AFMS

BACnet controller with real-time clock, MS/TP communication port, standard AFMS programming, and inclinometer

Select at least one.

TPE-1475-21 TPE-1475-22*

Low Pressure Transducer, -2 to +2′ wc
Low Pressure Transducers, ­10 to +10 or 0 to 10 wc

* Requires KMC Connect and technical support to configure.

MAT, RAT, and OAT Sensors
STE-14xx or similar 10,000 ohm, Type III thermistor, temperature sensor

BAC-9311ACE-AFMS

BACnet controller with real-time clock, two Ethernet communication ports, standard AFMS programming, and inclinometer

Proportional Actuator
similar to MEP-4xxx Proportional actuator, 25 to 180 inlb., fail-safe and non-fail-safe

Flow Pickup Tubes

Linkage Kit

Select at least two. SSS-1x1x

Select one if the unit has vertical-axis damper blades.

Pickup tubes, 3-5/32 to 9-29/32 in.

HLO-1050

(80 to 252 mm) length, with one to

six pickup points

3

Accessory: Linkage Kit, AFMS

CONTROLLER SPECIFICATIONS
For more specifications, see the related data sheets for each of the system’s components.
Airflow Measurement Accuracy
±3% of reading. May be field calibrated.

Environmental Limits

Operating Shipping Humidity

32 to 120° F (0 to 49° C) ­40 to 160° F (­40 to 71° C) 0 to 95% relative humidity (non-condensing)

Communications

MS/TP (optional)

One EIA-485 port (removable terminal block) for BACnet MS/TP, operating at 9.6, 19.2, 38.4, 57.6, 76.8, or 115.2 kilobaud; max. length of up to 4,000 feet (1,200 meters) of 18 AWG shielded twisted-pair, no more than 51 pf/ft (167 pf/m); use repeaters for longer distances

Ethernet (optional) NFC

On “E” models only, two 10/100BaseT Ethernet connectors for BACnet IP, Foreign Device, and Ethernet 802.3 (ISO 8802-3); segmentation supported; up to 328 ft (100 m) between controllers (using T568B Category 5 or better cable)
NFC (Near Field Communication) up to 1 inch (2.54 cm) from the top of the enclosure

Room sensor

Modular STE connection jack for STE-9000 series digital sensors and STE-6010/6014/6017 analog sensors

Auxiliary

One serial port with mini Type B connector (reserved for future use)

Installation
Power Supply voltage
Required power
Wire size

24 VAC (50/60 Hz) or 24 VDC; ­15%, +20%; Class 2 only; non-supervised (all circuits, including supply voltage, are power limited circuits)
BAC-5901C(E)-AFMS: 14 VA, plus external loads
BAC-9311C(E)-AFMS: 8 VA, plus external loads
12­24 AWG, copper, in a removable screw terminal block

Warranty, Protocol, and Approvals

Warranty KMC Limited Warranty 5 years (from mfg. date code)

BACnet Protocol Standard
Type

Meets or exceeds the specifications in ANSI/ASHRAE BACnet Standard 135-2010 for Advanced Application Controllers
BTL-certified as a B-AAC controller type

Regulatory Approvals

UL
BTL CE RoHS 2 FCC

UL 916 Energy Management Equipment listed
UL 864 Smoke Control Equipment listed (UUKL), 10th edition–for smoke control applications, see Smoke Control Manual for KMC Conquest Systems, P/N 000-035-18)
BACnet Testing Laboratory listed as Advanced Application Controller (B-AAC)
CE compliant
RoHS 2 compliant
FCC Class A, Part 15, Subpart B and complies with Canadian ICES-003 Class A*

*Complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. (NFC operation meets FCC compliance while the controller is in an unpowered state.)

4

Configuring and Operating

PROCESSES

BAC5051(A)E
router

Ethernet controller1
served
web pages

CONFIGURATION TOOLS

ConquestTM

KMC

NetSensor

ConnectTM or TotalControlTM

KMC
ConvergeTM for Niagara Workbench

KMC Commander®2

KMC
Connect LiteTM
(NFC) app3

Selecting the application

Configuring communication

Setting AFMS parameters

Calibrating sensors

Starting Learning Mode

Controlling airflow

Monitoring operation & faults

1 Ethernet (E) models with the latest firmware can be configured with a web browser from pages served within the controller. 2 KMC Commander’s AFMS module currently supports the standard AFMS application only.

3 Near Field Communication via enabled smart phone or tablet running the KMC Connect Lite app.

SUPPORT
Additional resources for installation, configuration, application, operation, programming, upgrading, and much more are available on the KMC Controls website (www.kmccontrols.com). Log-in to see all available files.

© 2025 KMC Controls, Inc.

Specifications and design are subject to change without notice

925-025-22A

Documents / Resources

KMC CONTROLS BAC-5901AC-AFMS BACnet AAC Airflow Measurement System [pdf] Instruction Manual BAC-5901AC-AFMS BACnet AAC Airflow Measurement System, BAC-5901AC-AFMS, BACnet AAC Airflow Measurement System, AAC Airflow Measurement System, Airflow Measurement System, Measurement System

References

• User Manual