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User Guide for KMC CONTROLS models including: TRF-5901C-AFMS TrueFit Airflow Measurement System, TRF-5901C-AFMS, TrueFit Airflow Measurement System, Airflow Measurement System, Measurement System, System

  SELECTION GUIDE for TrueFit Airflow Measurement System

Controller: TrueFit Airflow Measurement System, BACnet AAC, Clock, MSTP | KMC Controls

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Airflow Measurement System


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TrueFit AFMS Selection Guide AG230816B 
Airflow Measurement System
Selection Guide
For estimation, try the AFMS Selection Assistant interactive form, a companion to this selection guide.
Contents
Introduction ...............................................................................1 Example Diagrams.......................................................................2 Selecting an AFMS Controller (with inclinometer).............................4 Selecting Flow Pickup Tubes.........................................................5 Selecting Pressure Transducers ....................................................6 Selecting the Mixed Air Temperature Sensor ...................................7 Selecting the Outside Air Temperature Sensor .................................7 Selecting the Return Air Temperature Sensor ..................................7 Selecting a Proportional Actuator ..................................................8 Selecting an HLO-1050 Linkage Kit ................................................8 Selecting Tools for Configuration and Operation...............................9 Support .....................................................................................9
Introduction
The TrueFit Airflow Measurement System (AFMS) reliably provides accurate outside, return, and supply airflow data for monitoring and control. The system delivers accurate, repeatable results on 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 out-
side or return air damper blade · If only vertical damper blades, one HLO-1050 Linkage Kit · At least two airflow pickup tubes installed in a pitot array duct on the supply
fan inlet, in the supply air duct · If a TRF-5901C(E)-AFMS is used, one pressure transducer · If pressure assist measurements are needed (see Considerations on page 4),
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 for outside, mixed, and return air · One proportional actuator mounted on the damper shaft
KMC Controls, 19476 Industrial Drive, New Paris, IN 46553 / 877-444-5622 / Fax: 574-831-5252 / www.kmccontrols.com

Example Diagrams
Standard Application
OAD (Outside Air Damper) PA (Pressure Assist) Application
2

RAD (Return Air Damper) PA (Pressure Assist) Application
3

Selecting an AFMS Controller (with inclinometer)
Considerations
Does the unit have any of these non-standard features?:
· A relief fan that is variable speed, or is operating independent of mixed air damper position
· A return fan that is not controlled by a supply fan / return fan offset · A bypass damper utilized to bypass a heat recovery system · Return VAV boxes · Supply to return bypass (typically found in zone damper applications, or where a
bypass damper is used in place of a VFD) · Outside and return air dampers that modulate independently · More than one outside air damper
If yes, the pressure of the unit's mixed and/or return air sections may change. In that case, select a TRF-5901C(E)-AFMS for (OAD or RAD) pressure assist measurements.

TRF-5901C-AFMS (inclinometer included)
TRF-5901CE-AFMS (inclinometer included)

Is customizable programming needed?
If the capability to program the controller for other functions in addition to airflow measurement is needed, select a TRF-5901C(E)-AFMS. The inputs and outputs of a TRF9311C(E)-AFMS will be used by the components of the airflow measurement system. Therefore, it must be solely dedicated to airflow measurement.

TRF-9311C-AFMS (inclinometer included)

Where will the controller be mounted?
If the controller will be mounted more than 20 feet from the location of the airflow pickup tubes (see Selecting Flow Pickup Tubes on page 5), select a TRF-5901C(E)-AFMS. A pressure transducer can be mounted closer to the pickup tubes, then wired over a greater distance to the controller. (See Selecting Pressure Transducers on page 6.)

TRF-9311CE-AFMS (inclinometer included)

MODEL

APPLICATIONS

INPUTS

OUTPUTS

FEATURES

Customizable

Pressure Sensing

Real Time Clock (RTC)

Network

Airflow Measurement Programming

TRF5901CAFMS

10 total:
· 2 analog (room sensor port)
· 8 universal

8 universal:
· Software configurable as analog or

inputs (software

binary



configurable as · Override

TRF-

analog, binary, or

boards give

5901CE-

accumulator on

additional

AFMS

RTU

terminals)

options

TRF9311CAFMS
TRF9311CE-
AFMS

AHU
unit ventilator

1 air pressure sensor and 8 (total) standard:
· 2 analog (room sensor port)
· 6 universal inputs (software configurable as analog, binary, or accumulator on

10 total:
· 6 triacs (binary)
· 4 universal (software configurable as analog or binary)

terminals)

4

External

Integrated

MS/TP Ethernet

standard airflow measurement, OAD pressure assist, and RAD pressure assist application programming

MS/TP Ethernet

standard airflow measurement application

Selecting Flow Pickup Tubes
Options for Installation Location
The array of supply airflow pickup tubes can be installed in one of two places:
· At the supply air fan inlet · At least six straight duct widths down the supply air duct
If pressure assist measurements are needed (see Considerations on page 4) two additional flow pickup tubes must be installed, one on either side of the outside air damper (for OAD pressure assist) or return air damper (for RAD pressure assist).
Arrangement in Parallel Array
The pickup points must be arranged in a parallel array that evenly covers the area of the supply air duct or fan inlet, similar to what is show below:

Determining the Number of Pickup Points
1. Measure the duct or fan inlet:
· For a rectangular or square duct, measure the length of the longest side.
· For a circular duct or the supply fan inlet, measure the diameter.
2. Consult one of the tables below to determine the total minimum number of pickup points needed:

FOR A RECTANGULAR OR SQUARE DUCT

If the longest side is less than Total minimum number of

or equal to:

pickup points needed is:

4 inches

2

15 inches

3

24 inches

4

35 inches

5

48 inches

6

63 inches

7

80 inches

8

99 inches

9

100 inches or greater

10

traverse on round and square duct areas

FOR A CIRCULAR DUCT OR THE FAN INLET

Duct diameter

Total minimum number of pickup points needed:

<10 inches

6

10 inches

10

rectangular duct array

rounodundducdtuacrtray 5

Selecting the Tubes

Select multiple airflow pickup tubes (at least two) from below that are the maximum length that will fit in the space and total to at least the minimum number of pickup points needed:

SSS-101x models have 3/16" connections for 1/4" OD polyethylene tubing and flat mounting flanges for installation in ducts (or on fan inlets that have struts):

SSS-111x models have 3/16" connections for 1/4" OD polyethylene tubing and right-angled mounting feet for installation on the supply air fan bell.

SSS-1012 SSS-1013 SSS-1014 SSS-1015

One pickup point, 80 mm (about 3") length tubes
Two pickup points, 137 mm (about 5.5") length tubes
Three pickup points, 195 mm (about 8") length tubes
Four pickup points, 252 mm (about 10") length tubes

Single mounting foot:

SSS-1112 SSS-1113 SSS-1114

One pickup point, 80 mm (about 3") length tubes
Two pickup points, 137 mm (about 5.5") length tubes
Three pickup points, 195 mm (about 8") length tubes

Dual mounting feet:

SSS-1115 SSS-1116 SSS-1117

Four pickup points, five sections*, 315 mm (about 13") length tubes
Five pickup points, six sections*, 395 mm (about 15.5") length tubes
Six pickup points, seven sections*, 457 mm (about 18") length tubes

*NOTE: The extra section connects the tubes to the second mounting foot, which mounts to the other end of the fan bell (or a midway strut).

Selecting Pressure Transducers
NOTE: Select pressure transducers for a TRF-5901C(E)-AFMS only. TRF-9311C(E)-AFMS have differential air pressure ports, so a pressure transducer is not necessary to connect the flow pickup tubes.

For the standard airflow measurement application, select one pressure transducer.

For airflow measurement applications with pressure assist, select two pressure transducers.

MODEL NUMBER
TPE-1475-21 TPE-1475-22

INPUT PRESSURE RANGES (SELECTABLE)
­2 to +2" or 0 to 2" wc (­0.5 to +0.5 kPa or 0 to 0.5 kPa) ­10 to +10 or 0 to 10 wc (­2.5 to +2.5 kPa or 0 to 2.5 kPa)

6

Selecting the Mixed Air Temperature Sensor
Averaging sensors are necessary to minimize errors due to stratification or poor airflow mixing in the mixed air chamber. It is recommended to install the largest averaging sensor that the equipment will accommodate. Copper sensors are recommended when the mixed air section is easily accessible. If not easily accessible, a cable sensor can be used.

MODEL

SENSOR TYPE

PROBE TYPE

PROBE LENGTH

ENCLOSURE

CONNECTIONS*

STE-1411

STE-1412

STE-1414 STE-1413 STE-1415

Duct, Averaging

STE-1416

STE-1417

6 feet (1.8 m)

Copper, bendable

12 feet (3.6 m) 20 feet (6.1 m)

24 feet (7.3 m)

Flexible, FT-6 plenum-rated cable

6 feet (1.8 m) 12 feet (3.6 m) 24 feet (7.3 m)

Plastic, UL94-V0, IP65 (NEMA 4X) ABS

FT-6 plenum-rated, 22 AWG wire leads

Selecting the Outside Air Temperature Sensor
For units with accessible outside air hoods, select an STE-1412 12-foot bendable copper averaging sensor.
For units with inaccessible outside air hoods, or for outside air ducts, select an STE-1404 duct-mounted 12-inch probe with enclosure. (For sheltered tight fits, an STE-1405 duct-mounted 4-inch probe without enclosure can be used.)

MODEL

SENSOR TYPE

STE-1405 STE-1404

Duct, Rigid probe

OA Hoods, STE-1412 Averaging

PROBE TYPE

PROBE LENGTH

ENCLOSURE

1/4-inch OD 4 inches (100 mm) stainless-steel
12 inches (300 mm)

Copper, bendable

12 feet (3.6 m)

None (mounting bracket only)
Plastic, UL94-V0, IP65 (NEMA 4X) ABS

CONNECTIONS
10-ft. FT-6 plenum-rated, 22 AWG cable PVC insulated, 22 AWG, wire leads
FT-6 plenum-rated, 22 AWG, wire leads

Selecting the Return Air Temperature Sensor
When possible, select an STE-1404 duct-mounted 12-inch probe with enclosure. For sheltered tight fits, an STE-1405 ductmounted 4-inch probe without enclosure can be used.

MODEL

SENSOR TYPE

PROBE TYPE

PROBE LENGTH

ENCLOSURE

CONNECTIONS

STE-1405 STE-1404

Duct, Rigid probe

1/4-inch OD stainless-steel

4 inches (100 mm) 12 inches (300 mm)

None (mounting bracket only)
Plastic, UL94-V0, IP65 (NEMA 4X) ABS

10-ft. FT-6 plenum-rated, 22 AWG cable
PVC insulated, 22 AWG, wire leads

7

Selecting a Proportional Actuator
The unit must have a proportional damper actuator for the AFMS to modulate the damper as needed. If the unit does not have a proportional damper actuator already, select one.

MODEL
MEP-4552 MEP-4952

TORQUE*
in-lb. (N·m)
45 (5)
90 (10)

PROPORTIONAL CONTROL

FEEDBACK

0-10 or 2-10 VDC

0/1-5 or 0/2-10 VDC

MEP-7552

180

0-10 VDC, 2-10 VDC,

(20)

or 4-20 mA

*Use the online Actuator Calculator to assist with torque requirements.

FAILSAFE


Selecting an HLO-1050 Linkage Kit
The AFMS controller's inclinometer must be mounted on a horizontal-axis damper blade. For units with vertical-axis damper blades, select an HLO-1050 Linkage Kit. The linkages transfer the damper motion to a surface with a horizontal axis (the kit's inclinometer crankarm), on which inclinometer can then be mounted.
The kit's damper blade crankarm can be mounted to a damper blade or on a jackshaft using its included jackshaft coupler and V-bolt.
If the kit's axle mount shaft cannot be mounted on a unit's damper frame (such as when mounting in a duct), select a VTD-0903 right-angle bracket in addition to the kit.

damper blade mounting

jackshaft mounting

damper blade mounting in a duct with VTD-0903

8

Selecting Tools for Configuration and Operation

The rows in the table below list the processes to set up and operate an AFMS. The columns present the KMC Controls tools that can be used to complete the processes. Consult the table to determine which tools can complete each process and for which AFMS applications.

The user interface and setup requirements of each tool varies. For more information, see each tool's product pages and documents.

PROCESSES
Selecting the application
Configuring communication Setting AFMS
parameters Calibrating sensors

BAC5051(A)E
router
 

Ethernet controller1
served web pages





CONFIGURATION TOOLS

ConquestTM NetSensor

KMC
ConnectTM or TotalControlTM

KMC
ConvergeTM for Niagara
Workbench























KMC Commander®2

KMC
Connect LiteTM (NFC)
app3

  

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 product specifications, installation, configuration, application, operation, programming, upgrading and much more are available on the KMC Controls web site (www.kmccontrols.com). Log in to see all available files.

© 2024 KMC Controls, Inc.

Specifications and design su9bject to change without notice

AG230816B

References

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