KMC Controls BAC-5901C-AFMS User manual

Airflow Measurement System
Installation Guide
Contents
Example Diagrams .................................................2
Standard Application .......................................2
Outdoor Air Damper Pressure Assist Application..2
Return Air Damper Pressure Assist Application....3
Mounting the System Components ...........................4
Mounting the Controller ...................................4
Mounting the Inclinometer................................5
Mounting the Supply Airflow Pickup Tubes..........6
Mounting Pickup Tubes for Pressure Assist.........8
Mounting the Pressure Transducer(s)...............10
Mounting the OAT, RAT, and MAT Sensors .........11
Mounting a Proportional Actuator ....................13
Connecting System Components to the Controller ....14
Connecting the Airflow Pickup Tubes ...............14
Connecting the Inclinometer ...........................15
Connecting the Outside Air Temperature Sensor.15
Connecting the Return Air Temperature Sensor ..16
Connecting the Mixed Air Temperature Sensor...16
Connecting the Proportional Actuator...............17
Connecting Networks...........................................18
Connecting an Ethernet Network......................18
Connecting an MS/TP Network ........................18
Connecting Power ...............................................20
Connecting Power to the Controller..................20
Connecting Power to the Inclinometer ..............20
Connecting Power to the Pressure Transducer(s)20
Connecting Power to the Proportional Actuator..21
Controller Power and Communication Status ...........22
Controller MS/TP Network Isolation Bulbs...............23
Wiring Diagrams..................................................24
Input/Output Objects/Connections .........................30
Configuring and Operating ....................................30
Important Notices................................................31
KMC Controls, 19476 Industrial Drive, New Paris, IN 46553 /877-444-5622 /Fax: [phone] /www.kmccontrols.com

Standard Application
Example Diagrams
REVISE
Outdoor Air Damper Pressure Assist Application
TrueFit Airflow Measurement System Installation Guide 2925-019-05C

Return Air Damper Pressure Assist Application
TrueFit Airflow Measurement System Installation Guide 3925-019-05C

Mounting the System Components
Mounting the Controller
NOTE: Mount the controller inside a metal enclosure for RF shielding and physical protection.
NOTE: To mount the controller with screws on a flat surface, complete the steps in On a Flat Surface Or to
mount the controller on a 35 mm DIN rail (such as integrated in an HCO-1103 enclosure), complete
the steps in On a DIN Rail.
On a Flat Surface
1. Position the controller on a flat surface so that the color-coded terminal blocks 1are easy to access for
wiring after the controller is mounted.
NOTE: The black terminals are for power. The green terminals are for inputs and outputs. The grey
terminals are for communication.
2. Screw a #6 sheet metal screw through each corner 2of the controller.
12
12
On a DIN Rail
1. Position the DIN rail 3so that the color-coded terminal blocks are easy to access for wiring after the
controller is mounted.
2. Pull out the DIN latch 4until it clicks once.
3. Position the controller so that the top four tabs 5of the back channel rest on the DIN rail.
4
5
3
TrueFit Airflow Measurement System Installation Guide 4925-019-05C

4. Lower the controller against the DIN rail.
5. Push in the DIN latch 6to engage the rail.
NOTE: To remove the controller, pull the DIN latch until it clicks once and lift the controller off the DIN rail.
6
Mounting the Inclinometer
NOTE: If the outside air damper has vertical-axis damper blades, you will first need to install an HLO-1050
Linkage Kit on the outside air damper. (See the HLO-1050 Linkage Kit Installation Guide.) Then
continue below.
1. Position the inclinometer on a horizontal-axis outside air damper blade so that the wire is parallel with the
blades and the arrow on the inclinometer sticker points up.
KMC Conquest Airflow Measurement System
Model: BAC-9311C(E)
CREATION DATE: FILENAME:
REVISION DATE:
DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553
PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2021
KMC CONQUEST AIRFLOW MEASUREMENT SYSTEM W/BAC-9311
AFMS-9311C-1-SUBMITTAL
9/1/21
NOTES:
1. Controller settings must be initially set using
an STE-9XX1.
2. See the AFMS Selection, Installtion and
Application Guides for additional installation
details.
3. See www.kmccontrols.com for accessories
and additional details.
HL
HL
H
L
H
L
AIRFLOW
TUBE
POLY
TUBING
SUPPLY
DUCT
AIRFLOW
TUBE
AIRFLOW
TUBE
SUPPLY
DUCT
SUPPLY
DUCT
AIRFLOW
TUBE
NOTE: If the unit has more than one outside air damper, mount the inclinometer on a horizontal-axis return
air damper blade. (However, if the unit also has more than one return air damper, an AFMS cannot
be installed.)
2. Attach the inclinometer to the damper blade with two #8 sheet metal screws.
3. Route the cord away from the damper so that it will not bind the damper.
4. Route the cord to the controller.
NOTE: Attach adequate strain relief (e.g. with wire ties) if needed to prevent the inclinometer from
accidentally being pulled off of the damper blade during equipment maintenance.
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Mounting the Supply Airflow Pickup Tubes
There must be enough pressure flow pickup tubes must installed, for the size of the opening, to get an
accurate average value for the air-stream. Multiple pickup tubes (at least 2) connected in a parallel pitot array
are recommended.
The supply air pressure flow pickup tubes can be installed in one of three ways:
yOn the Supply Air Fan Bell (using SSS-1112/3/4) on page 6.
yOn the Supply Air Fan Bell (using SSS-1115/6/7) on page 6.
yIn the Supply Air Duct (using SSS-101x) on page 6.
On the Supply Air Fan Bell (using SSS-1112/3/4)
1. Position the pickup tubes’ mounting foot on the edge of the fan bell so that the ends of the tubes are
pointing toward the center of the fan inlet.
NOTE: All pickup points must be within the air-stream for accurate averaging of the differential pressure
flow. If the pickup tubes are too long, use a shorter model.
2. Attach the tubes to the fan bell using two self-tapping screws inserted through the 3/16” mounting holes.
3. Repeat steps 1 to 2 to mount the remaining pickup tubes.
On the Supply Air Fan Bell (using SSS-1115/6/7)
1. Position the pickup tubes so that the mounting feet span the fan inlet and all pickup points are within the
air-stream.
NOTE: All pickup points must be within the air-stream for accurate averaging of the differential pressure
flow. If the pickup tubes are too long, use a shorter model.
2. Attach the first mounting foot to the fan bell using two self-tapping screws inserted through the 3/16”
mounting holes.
3. Attach the second mounting foot to the opposite edge of the fan bell (or the strut) using two self-tapping
screws inserted through the 3/16” mounting cutouts.
4. Repeat steps 1 to 3 to mount the remaining pickup tubes.
In the Supply Air Duct (using SSS-101x)
NOTE: The pressure flow pickup tubes should be mounted in filtered air in the location of laminar flow,
which is about 6 straight duct diameters down the air duct.
1. Determine the duct’s flow direction and install the pickup tubes based on the flow arrow imprint.
NOTE: The pickup tubes must be mounted with the arrow pointing in the direction of the airflow.
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2-3/4” (70 mm)
3-1/2” (89 mm)
7/16” (11 mm)
1/4” (6 mm) thick foam gasket
1-1/2”
(38 mm)
for SSS-101x
or
1-1/4”
(32 mm)
for SSS-100x
3-5/32”
(80 mm) for SSS-10x2
5-13/32”
(137 mm) for SSS-10x3
7-21/32” (195 mm) for SSS-10x4
9-29/32”
(252 mm) for SSS-10x5
1/4" nipple
(SSS-100x)
for 3/8" OD
polyethylene
tubing or
3/16" nipple
(SSS-101x) for
1/4" OD tubing
Mounting Holes, 3/16” (5 mm)
2. Cut a 7/8” hole in the duct to accept the pickup tubes.
1-3/8” (35 mm) 1-3/8” (35 mm)
Drill two holes for self-tapping screws inserted through
the pickup tubes’3/16” (5 mm) mounting holes.
Cut 7/8”
(22 mm)
diameter
3. Attach the pickup tubes to the duct using two self-tapping screws inserted through the 3/16” mounting
holes.
4. Repeat steps 1 to 3 to mount the remaining pickup tubes.
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Mounting Pickup Tubes for Pressure Assist
Mounting for OAD Pressure Assist
Complete these additional steps only if installing a BAC-5901C-AFMS or BAC-5901CE-AFMS for an OAD
pressure assist application. (See the KMC AFMS Selection Guide for details.)
Mounting the First Airflow Pickup Tube
1. Find a location for the first pickup tube outside of the outside air damper, in a location without turbulent
flow from the incoming outside air-stream.
NOTE: For example, in a corner under the outside air intake hood. (See the drawing above.)
2. Determine the airflow direction in order to install the pickup tube so that the FLOW arrow imprint is
perpendicular to the direction of the airflow (for static pressure measurement).
NOTE: In this case, the FLOW arrow imprint can point either up or down. Mark the SSS-10xx to assure
others that this perpendicular orientation is indeed the intended orientation.
3. Cut a 7/8” (22 mm) hole in the duct to accept the pickup tube.
4. Attach the pickup tube to the sheet metal using two self-tapping screws inserted through the 3/16” (5 mm)
mounting holes.
Mounting the Second Airflow Pickup Tube
1. Find a location for the second pickup tube in the mixed air chamber, in a location without turbulent air flow.
NOTE: For example, in a corner of the mixed air chamber just inside of the outside air damper. (See the
drawing above.)
2. Determine the airflow direction in order to install the pickup tube so that the FLOW arrow imprint is
perpendicular to the direction of the airflow (for static pressure measurement).
NOTE: In this case, the FLOW arrow imprint can point either up or down. Mark the SSS-10xx to assure
others that this perpendicular orientation is indeed the intended orientation.
3. Cut a 7/8” (22 mm) hole in the duct to accept the pickup tube.
4. Attach the pickup tube to the sheet metal using two self-tapping screws inserted through the 3/16” (5 mm)
mounting holes.
TrueFit Airflow Measurement System Installation Guide 8925-019-05C

Mounting for RAD Pressure Assist
Complete these steps only if installing a BAC-5901C-AFMS or BAC-5901CE-AFMS for a RAD pressure assist
application. (See the KMC AFMS Selection Guide for details.)
Mounting the First Airflow Pickup Tube
1. Find a location for the first pickup tube near the return air damper, on the damper’s upstream side.
2. Determine the airflow direction in order to install the pickup tube so that the FLOW arrow imprint is
perpendicular to the direction of the airflow (for static pressure measurement).
NOTE: In this case, the FLOW arrow imprint can point either up or down (in a horizontal duct), or either left
or right (in a vertical duct).
NOTE: It is recommended that a marking be applied to the SSS-10xx to assure others that this
perpendicular orientation is indeed the intended orientation.
3. Cut a 7/8” (22 mm) hole in the duct to accept the pickup tube.
4. Attach the pickup tube to the sheet metal using two self-tapping screws inserted through the 3/16” (5 mm)
mounting holes.
Mounting the Second Airflow Pickup Tube
1. Find a location for the second pickup tube near the return air damper, on the damper’s downstream (i.e.
mixed air) side.
2. Determine the airflow direction in order to install the pickup tube so that the FLOW arrow imprint is
perpendicular to the direction of the airflow (for static pressure measurement).
NOTE: In this case, the FLOW arrow imprint can point either up or down (in a horizontal duct), or either left
or right (in a vertical duct).
NOTE: It is recommended that a marking be applied to the SSS-10xx to assure others that this
perpendicular orientation is indeed the intended orientation.
3. Cut a 7/8” (22 mm) hole in the duct to accept the pickup tube.
4. Attach the pickup tube to the sheet metal using two self-tapping screws inserted through the 3/16” (5 mm)
mounting holes.
TrueFit Airflow Measurement System Installation Guide 9925-019-05C

Mounting the Pressure Transducer(s)
NOTE: Complete these steps only if using a BAC-5901C(E)-AFMS controller.
NOTE: Avoid locations with severe vibrations or excessive moisture. The enclosure has a standard 1/2-inch
conduit opening and may be installed with either a conduit coupler or a cable-gland-type fitting.
CAUTION
Do not use in explosive or hazardous environments, with combustible or flammable gasses, as
a safety or emergency stop device, or in any other application where failure of the product could
result in personal injury.
1. Ensure there is enough space around the unit to make the pressure and electrical connections.
2. Use screws threaded through the case’s mounting holes to fasten the assembly to a location near the array
of pressure flow pickup tubes. Do not over-tighten.
3. If additional pressure flow pickup tubes were installed at the outside air damper or return air damper
location for pressure assist measurements, repeat steps 1 and 2 for a second pressure transducer located
near those pickup tubes.
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Mounting the OAT, RAT, and MAT Sensors
STE-1411/12/13/14 Bendable Copper Sensor
Use a bendable copper sensor for easily-accessible mixed air sections and outside air hoods. If the mixed
air section is not easily accessible, a flexible cable sensor may be used. If the unit does not have an easily-
accessible outside air hood, a rigid steel probe may be used.
Use
Tie Wraps
to Secure
Tubing
6"
Min.
Bend
Radius
1. Cut a hole in the mixed air chamber of the unit large enough to feed the copper probe from the back of the
enclosure.
2. Insert the sensor probe into the mixed air chamber, bend the probe tubing to cover the air path, and secure
as needed.
NOTE: Maintain a minimum bend radius of six inches to prevent damage to the wires or sensors.
3. Fasten the enclosure to the unit by drilling holes in the side of the unit and threading screws through the
mounting holes in the case.
4. For the cable leading to the AFMS controller, attach conduit to the 1/2” NPT threaded connection hole at
the bottom of the enclosure as needed.
5. Open the cover by pulling slightly on the latch on the right side of the enclosure while pulling on the cover.
STE-1415/6/7 Flexible Cable Sensor
A flexible cable sensor may be used if the mixed air section is not easily accessible.
Use
Tie Wraps
to Secure
Cable
2"
Min.
Bend
Radius
1. Cut a hole in the mixed air chamber of the unit large enough to feed the sensor cable from the back of the
sensor enclosure.
TrueFit Airflow Measurement System Installation Guide 11 925-019-05C

2. Insert the sensor cable into the mixed air chamber, stringing the cable to cover the air path, and secure as
needed.
NOTE: The flexible cable can be easily shaped to fit any duct size but observe a minimum bend radius of
two inches to prevent damage to wires or sensors.
3. Fasten the enclosure to the unit by drilling holes in the side of the unit and threading screws through the
mounting holes in the case.
4. For the cable leading to the AFMS controller, attach conduit to the 1/2” NPT threaded connection hole at
the bottom of the enclosure as needed.
5. Open the cover by pulling slightly on the latch on the right side of the enclosure while pulling on the cover.
STE-1404/05 Rigid Steel Probe
Use a rigid probe for the return air duct. A rigid probe may also be used for the outside air duct, but only if the
unit does not have an easily-accessible outside air hood.
10’
3.05 m
2.80“
71.1 mm
2.20“
63.5 mm
Various Probe Lengths
1.10“
27.9 m
m0.25“
6.35 mm
STE-1401/1405
(No Enclosure)
1. Locate the sensor in a straight section of duct, away from heating, cooling, or humidifier sources.
2. Cut a 1/4-inch hole for the probe in the side of the duct as well as smaller holes for screws at the
appropriate locations.
3. Insert the probe and fasten the assembly to the duct using screws threaded through the mounting holes in
the housing.
4. Open the sensor cover (STE-1404 only) by pulling slightly on the latch on the right side of the enclosure
while pulling on the cover.
5. For the cable leading to the AFMS controller, attach conduit to the 1/2” NPT threaded connection hole at
the bottom of the enclosure as needed.
TrueFit Airflow Measurement System Installation Guide 12 925-019-05C

Mounting a Proportional Actuator
Complete these steps only if there is not a proportional actuator already mounted on the correct damper for
the application needed:
• For standard or OAD applications, mount the proportional actuator on the outside air damper (or,
alternatively, on the return air damper, if it moves together with the outside air damper).
• For RAD pressure assist applications, mount the proportional actuator on the return air damper (or,
alternatively, on an outside air damper that moves together with the return air damper).
For instructions on how to mount your particular model of MEP-series proportional actuator:
1. Select the appropriate link from the list, or search for it on the KMC Controls website:
• MEP-4552
• MEP-4952
• MEP-7552
2. Access the installation guide found on that model’s product page.
3. Follow the instructions for mounting, on the appropriate damper for the application needed:
• For standard or OAD pressure assist applications, mount the proportional actuator on the outside air
damper (or, alternatively, on the return air damper, if it moves together with the outside air damper).
• For RAD pressure assist applications, mount the proportional actuator on the return air damper (or,
alternatively, on an outside air damper that moves together with the return air damper).
TrueFit Airflow Measurement System Installation Guide 13 925-019-05C

Connecting System Components to the Controller
Connecting the Airflow Pickup Tubes
For a BAC-5901C(E)-AFMS
Use appropriately sized polyethylene tubing for the pressure connections. The length of the tubing should not
be longer than necessary. Arrange the tubing to minimize stress on the connections and prevent kinking.
Connecting the Supply Airflow Pickup Tubes to the Pressure Transducer
1. With tubing, connect the Port Hs of all the pickup tubes in parallel in a loop, then connect to the High input
on the supply air pressure transducer.
2. With tubing, connect the Port Ls of all the pickup tubes in parallel in a loop, then connect to the Low input
on the supply air pressure transducer.
Connecting the Airflow Pickup Tubes for OAD Pressure Assist Applications
Complete these steps if two additional SSS-1000 series pickup tubes were installed at the location of the
outside air damper for pressure assist.
1. For the pickup tube mounted outside of the outside air damper, connect one of its ports, with tubing, to the
High input on the transducer used for pressure assist.
NOTE: It does not matter, in this application, which pickup tube port (Hor L) is connected to the
transducer’s High input.
2. For the pickup tube mounted inside of the outside air damper, connect one of its ports, with tubing, to the
Low input on the transducer used for pressure assist.
NOTE: It does not matter, in this application, which pickup tube port (Hor L) is connected to the
transducer’s Low input.
NOTE: The other ports of the two pickup tubes are left unconnected and open to air.
Connecting the Airflow Pickup Tubes for RAD Pressure Assist Applications
Complete these steps if two additional SSS-1000 series pickup tubes were installed at the location of the return
air damper for pressure assist.
1. For the pickup tube mounted on the upstream side of the return air damper, connect one of its ports, with
tubing, to the High input on the transducer used for pressure assist.
NOTE: It does not matter, in this application, which pickup tube port (Hor L) is connected to the
transducer’s High input.
2. For the pickup tube mounted on the downstream (i.e. mixed air) side of the return air damper, connect one
of its ports, with tubing, to the Low input on the transducer used for pressure assist.
NOTE: It does not matter, in this application, which pickup tube port (Hor L) is connected to the
transducer’s Low input.
TrueFit Airflow Measurement System Installation Guide 14 925-019-05C

NOTE: The other ports of the two pickup tubes are left unconnected and open to air.
Connecting the Pressure Transducer(s) to the Controller
1. Connect the signal wire from OUT on the supply air pressure transducer to UI9 on the controller.
2. If installing a second transducer for (OAD or RAD) pressure assist applications, connect the signal wire
from OUT on the second transducer to UI10 on the controller.
For a BAC-9311C(E)-AFMS
NOTE: Use 1/4 inch (6.35 mm) FR tubing. Tubing should not be longer than 20 feet (6 meters).
1. Remove the black shipping plugs from the PRESSURE SENSOR ports.
2. With tubing, connect the Port Hs of all the pickup tubes in parallel in a loop, then connect to the HIGH
7
port on the controller. (See Wiring Diagrams on page 24.)
3. With tubing, connect the Port Ls of all the pickup tubes in parallel in a loop, then connect to the LOW
8
port on the controller. (See Wiring Diagrams on page 24.)
8
7
Connecting the Inclinometer
1. Connect the inclinometer’s yellow signal wire to UI7 on the controller.
2. Connect the inclinometer’s green signal wire to UI8 on the controller.
3. Connect the inclinometer’s blue ground wire to GND (between UI7 and UI8) on the controller.
4. Connect the inclinometer’s red power wire to either UO8 (for a BAC-5901C[E]-AFMS) or U10 (for a BAC-
9311C[E]-AFMS).
Connecting the Outside Air Temperature Sensor
NOTE: Use 18 to 24 AWG shielded wiring for all connections. Do not locate the device wires in the same
conduit with wiring used to supply inductive loads such as motors.
1. Bring the cable that will go to the AFMS controller through the bottom hole.
2. Make connections to the two wire leads with either butt-splices or solder. (Using wire nuts is not
recommended.)
TrueFit Airflow Measurement System Installation Guide 15 925-019-05C

NOTE: The two-wire sensor is not polarity sensitive.
3. Plug the conduit with sealant to prevent air infiltration.
4. Swing the door closed until securely latched.
5. If desired for added security, install the two (provided) screws in the door’s integrated screw tabs.
6. Connect the sensor’s signal wire to UI4 on the controller.
7. Connect the sensor’s ground wire to GND (next to UI4) on the controller.
Connecting the Return Air Temperature Sensor
NOTE: Use 18 to 24 AWG shielded wiring for all connections. Do not locate the device wires in the same
conduit with wiring used to supply inductive loads such as motors.
1. Feed the wire that will go to the AFMS controller through the bottom hole (if applicable).
2. Make connections to the two wire leads with either butt-splices or solder. (Using wire nuts is not
recommended.)
NOTE: The two-wire sensor is not polarity sensitive.
3. Plug the conduit with sealant to prevent air infiltration.
4. Swing the door (if applicable) closed until securely latched.
5. If desired for added security (and if applicable), install the two (provided) screws in the door’s integrated
screw tabs.
6. Connect the sensor’s signal wire to UI5 on the controller.
7. Connect the sensor’s ground wire to GND (next to UI5) on the controller.
Connecting the Mixed Air Temperature Sensor
NOTE: Use 18 to 24 AWG shielded wiring for all connections. Do not locate the device wires in the same
conduit with wiring used to supply inductive loads such as motors.
1. Feed the wire that will go to the AFMS controller through the bottom hole.
2. Make connections to the two wire leads with either butt-splices or solder. (Using wire nuts is not
recommended.)
NOTE: The two-wire sensor is not polarity sensitive.
3. Plug the conduit with sealant to prevent air infiltration.
4. Swing the door closed until securely latched.
NOTE: If desired for added security, install the two (provided) screws in the door’s integrated screw tabs.
5. Connect the sensor’s signal wire to UI6 on the controller.
6. Connect the sensor’s ground wire to GND (next to UI6) on the controller.
TrueFit Airflow Measurement System Installation Guide 16 925-019-05C

Connecting the Proportional Actuator
Using an Existing Proportional Actuator
NOTE: Follow the procedure in this section when installing the AFMS into a unit that already has a
proportional actuator, which is controlled by another controller, mounted to the outdoor or return air
damper.
CAUTION
Power off the actuator and the other controller before taking the following steps!
1. Disconnect from the existing actuator the signal wire that comes from the output of the other controller.
2. Disconnect from the existing actuator the ground wire that comes from the other controller.
3. Connect the signal wire (coming from the other controller) to UI3 on the AFMS controller.
4. Connect the ground wire (coming from the other controller) to the GND terminal (next to UI3) on the AFMS
controller.
5. Run a new signal wire – from UO7 on a BAC-5901-AFMS, or from UO9 on a BAC-9311-AFMS – to the signal
terminal on the actuator.
6. Connect the signal common wire of that new (twisted pair) wire to the GND terminal (next to UO7/UO9) on
the AFMS controller.
Using a New Proportional Actuator
For instructions on how to wire your particular model of actuator to the controller:
1. Click on the appropriate model from the list, or search for it on the KMC Controls website:
• MEP-4552
• MEP-4952
• MEP-7552
2. Access the installation guide found on that model’s product page.
3. Follow all instructions on wiring to the controller that apply to your model of actuator.
NOTE: For information on which controller inputs and outputs to wire to, see Wiring Diagrams on page 24
and Input/Output Objects/Connections on page 30.
NOTE: For information on which controller inputs and outputs to wire to, see Wiring Diagrams on page 24
and Input/Output Objects/Connections on page 30.
TrueFit Airflow Measurement System Installation Guide 17 925-019-05C

Connecting Networks
Connecting an Ethernet Network
For “E” models only, connect an Ethernet patch cable to the 10/100 ETHERNET port
9
.
CAUTION
Do NOT plug a cable meant for Ethernet communications into the Room Sensor port! The Room
Sensor port powers a NetSensor. The supplied voltage may damage an Ethernet switch or router.
NOTE: The Ethernet patch cable should be T568B Category 5 or better and a maximum of 328 feet (100
meters) between devices.
9
NOTE: Ethernet-enabled “E” models with the latest firmware can be configured with a web browser from
pages served from within the controller. The controllers have the following default network address
values:
• IP address—192.168.1.251
• Subnet mask—255.255.255.0
• Gateway—192.168.1.1
Connecting an MS/TP Network
1. For a BAC-5901C-AFMS or BAC-9311C-AFMS, connect the BACnet network to the gray BACnet MS/TP
terminal block
10
.
10
NOTE: Use 18 gauge AWG shielded twisted pair cable with maximum capacitance of 51 picofarads per
foot (0.3 meters) for all network wiring (Belden cable #82760 or equivalent).
A. Connect the –A terminals in parallel with all other –A terminals on the network.
B. Connect the +B terminals in parallel with all other +B terminals on the network.
C. Connect the shields of the cable together at each device using a wire nut or the Sterminal in KMC
BACnet controllers.
2. Connect the cable shield to a good earth ground at one end only.
NOTE: For principles and good practices when connecting an MS/TP network, see Planning BACnet
Networks (Application Note AN0404A).
TrueFit Airflow Measurement System Installation Guide 18 925-019-05C

3. If the controller is at either end of a BACnet MS/TP network (only one wire under the terminals), turn the
EOL switch to ON.
NOTE: The EOL switch is shipped from the factory in the OFF position.
TrueFit Airflow Measurement System Installation Guide 19 925-019-05C

Connecting Power
Connecting Power to the Controller
To connect a 24 VAC, Class-2 transformer to the black power terminal block of the controller:
1. Connect the neutral side of the transformer to the controller’s common terminal ⊥ ⊥
11
.
2. Connect the AC phase side of the transformer to the controller’s phase terminal ∼ ∼
12
.
1211
NOTE: Connect only one controller to each 24 VAC, Class-2 transformer with 12–24 AWG copper wire.
NOTE: Use either shielded connecting cables or enclose all cables in conduit to maintain RF emissions
specifications.
NOTE: To use DC power supply instead of AC, see the “Power (Controller) Connections” section of the KMC
Conquest Controller Application Guide.
Connecting Power to the Inclinometer
1. Connect the inclinometer’s red power wire to UO8 for a BAC-5901-AFMS, or UO10 for a BAC-9311-AFMS.
2. Connect the inclinometer’s blue ground wire to GND/SC on the controller.
Connecting Power to the Pressure Transducer(s)
NOTE: Complete these steps only if using a BAC-5901C(E)-AFMS controller.
NOTE: Use at least 22 AWG, shielded, twisted-pair wiring for all connections. Do not locate device wires in
the same conduit with wires supplying inductive loads.
CAUTION
When grounding the secondary of an AC transformer or when wiring multiple devices, ensure that
the circuit ground point is the same on all devices and the controller.
1. Connect the controller’s phase terminal ∼ ∼ to the transducer’s PWR terminal.
2. Connect the controller’s common terminal ⊥⊥to the COM terminal on the transducer.
3. If there is a second transducer for pressure assist applications, repeat steps 1 and 2 for that transducer.
TrueFit Airflow Measurement System Installation Guide 20 925-019-05C