Ruskin TDFi-RT Manual

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Air Quality Solutions
Installation and Maintenance Manual
Model: TDFi-RT
Fan Inlet Airflow and Temperature Measurement Station
Electronic Thermal Dispersion Sensing Technology
ALL STATED SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE OR OBLIGATION

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Contents
APPLICATIONS.............................................................................................................................3
CONFIGURATIONS........................................................................................................................4
INSTALLATION ............................................................................................................................. 7
IDENTIFYING LOCATION TO MOUNT HOST MONITOR BOX (REMOTE OR LOCAL HOST) .............10
LOCATING THE BOOM ARM AND SENSOR ON THE FAN INLET ...................................................10
CONNECTING THE SENSOR CABLE ASSEMBLY TO THE HOST OR CLIENT MONITOR BOX........... 13
WIRING...................................................................................................................................... 13
WIRING CONNECTIONS..............................................................................................................14
HOST AND REMOTE HOST MONITOR BOX ................................................................................ 15
HOST AND REMOTE HOST MONITOR BOX FEATURES................................................................ 15
CLIENT MONITOR BOX FEATURES.............................................................................................. 16
Configure Settings At Power-Up (if not already configured or Factory Default was performed) .................................... 17
Resetting Factory Default Fan Configurations - Supervisor Menu .................................................................................18
FAN CALIBRATION PROCEDURES................................................................................................ 19
For Single Fan or Fans of Various Diameters .................................................................................................................19
For Fan Arrays of Same Diameter..................................................................................................................................20
TROUBLESHOOTING .................................................................................................................. 22
MAINTENANCE .......................................................................................................................... 26
REPAIR INFORMATION ............................................................................................................... 26

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APPLICATIONS
The Ruskin model TDFi-RT (Thermal Dispersion Fan inlet – Real Time) fan inlet airflow measuring system uses thermal dispersion
technology to measure and average the airflow velocity and temperature from fan inlet sensors mounted on the fan inlet bell, providing
accurate and repeatable airflow measurement from 0 to 10,000 fpm (0 to 50.8 mps) within ±3% accuracy. The TDFi-RT sensing probes
can be installed in retrofit applications or specified on new construction projects.
The factory-assembled TDFi-RT system includes the HOST monitor box, CLIENT monitor box(es) as applicable based on the system
configuration, sensor Boom Arm assemblies, and communication cable(s) which are connected to each CLIENT box.
Each fan inlet sensor measures flow and temperature, sending this information to a Host or Client monitor box which provides airflow and
air temperature information on an LCD screen. The HOST sends the average flow and average temperature of all sensors and fans to the
BAS through two analog outputs (4-20mA or 2-10VDC) or for each fan through BACnet MS/TP protocol.
The TDFi-RT provides effective airflow measuring on individual fans, fans of differing diameters, and fan arrays when installed in accordance
with the information contained in this manual. Acceptable fan types include Centrifugal, Plenum, and Axial.
TDFi-RT Advanced Thermal Dispersion Fan Inlet
Airflow & Temperature Measuring Station
Installation Instructions
Refer to the Ruskin.com website for the most up-to-date version of this document.
HOST Monitor Box CLIENT Monitor Box
M8 Connection for Sensor Cable
Assemblies on each Monitor Box.
NOTE: As the Remote Host boxes will
not have Sensor Cable Assemblies
connected, M8 connectors will come
with a protective cap to cover the
openings.
Communication Cable (Power/Data)
NOTE: Quantity shipped is based on number
of Client Monitor Boxes required per system.
Sensor Cable Assemblies
NOTE: Quantity shipped is based on
Customer’s selection of 1 or 2 sensors per fan.

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The unique design of the TDFi-RT ensures minimal pressure drop by using less hardware across the fan inlet. The TDFi-RT’s principle of
operation is to monitor the airflow using either one or two thermal dispersion sensors at a location in the fan’s inlet where the air entering
velocity through the fan changes as the fan speed increases or decreases. While the TDFi-RT will display an airflow when initially installed,
it is critical that the calibration process be completed using actual system airflows which will then automatically compensate for slight
differences in installation locations, different fan types, and installed system effects.
Upon completion of the calibration process, the TDFi-RT will accurately display and track airflow throughout the fan’s complete range of
operating airflows.
NORTH AMERICAN EMISSIONS COMPLIANCE
United States
This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when this equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely
to cause harmful interference, in which case the user will be required to correct the interference at his/her own expense.
Canada
This Class (A) digital apparatus meets all the requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil
numérique de la Classe (A) respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
CONFIGURATIONS
Shown below are a few examples of typical installations with the various components of the system called out. Each TDFi-RT can be
configured for installation on up to 16 fans, utilizing 1 or 2 sensors per fan. Each configuration example below displays 2 sensors per fan.
IMPORTANT: It is critical that the calibration process be completed using actual system airflows
IMPORTANT!
The HOST must be located external to the air
stream. The interface must be accessible during
normal operation & field calibration.
CONFIGURATION:
1 FAN / 2 SENSORS PER FAN I&M: Figure 1
* (2) Sensor Cable Assemblies per Fan
(25’ lengths is Standard)

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IMPORTANT!
The Remote HOST must be located external to
the air stream. The interface must be
accessible during normal operation & field
calibration.
IMPORTANT!
The HOST must be located external to
the air stream. The interface must be
accessible during normal operation &
field calibration.
* (2) Sensor Cable Assemblies
per Fan (10 ft or 25 ft options)
10 ft Standard
** Remote Host Power/Data
Cable Assemblies
(10’, 25’ & 50’ options)
* (2) Sensor Cable Assemblies per
Fan. 25 ft Standard for HOST; 10 ft or
25 ft options for CLIENT
(10 ft is Standard)
** Client Power/Data
Cable Assembly. 25’ Standard
for HOST-to-CLIENT connection
I&M: Figure 2
I&M: Figure 3
CONFIGURATION:
1 FAN / 2 SENSORS PER FAN
With Remote Host
CONFIGURATION:
2 FAN / 2 SENSORS PER FAN

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IMPORTANT!
The Remote HOST must be located external to
the air stream. The interface must be
accessible during normal operation & field
calibration.
* (2) Sensor Cable Assemblies
per Fan (10 ft or 25 ft options)
10 ft Standard
** Client Power/Data Cable
Assembly. (18 in, 32 in, 44 in,
50 in, 10 ft, and 25 ft options)
*** Remote Host Power/Data
Cable Assemblies
(10 ft, 25 ft, and 50 ft options)
CONFIGURATION:
2 FAN / 2 SENSORS PER FAN
With Remote Host I&M: Figure 4
I&M: Figure 5
IMPORTANT!
The HOST must be located
external to the air
stream. The interface must be
accessible during
normal operation & field
calibration.
* (2) Sensor Cable Assemblies
per Fan. 25 ft Standard for
HOST; 10 ft or 25 ft options for
CLIENT (10 ft is Standard)
** Client Power/Data Cable
Assembly. 25 ft Standard for
HOST-to-CLIENT connection
*** Client Power/Data
Cable Assembly.
(18 in, 32 in, 44 in, 50 in,
10 ft, and 25 ft options)

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After the installation described in this document is complete, please refer to the TDFi-RT Technical Bulletin for information regarding
configuration options.
The Technical Bulletin document can be viewed or downloaded at this location: http://www.ruskin.com/model/tdfi-rt
The Technical Bulletin document can also be viewed via the QR code shown below:
INSTALLATION
Warning: Risk of Electric Shock Disconnect power supply before making electrical connections. Contact with components
carrying hazardous voltage can cause electrical shock and may result in severe personal injury or death.
Only a qualified service technician should install this system. To avoid unsatisfactory operation or damage to the product, strictly follow
the instructions provided and do not substitute parts. Damage to the product resulting from not following the instructions or using
unauthorized parts may be excluded from the manufacturer’s warranty coverage.
IMPORTANT: In addition to these instructions, the installation contractor shall comply with all local and International codes and standards
to ensure proper and safe installation.
Software Configuration Information for Commissioning:
Unpacking the Advanced Thermal Dispersion Fan Inlet Airflow Measuring System
Remove the thermal dispersion sensor cable assemblies, monitor boxes, power/data cabling, and any accessories from the shipping
containers and inspect for damage prior to installation. The contents of each shipping box will satisfy the requirements for each air
measurement station on your order. If the components necessary for one air measurement station of your order can not safely be placed
into a single shipping box, an additional box(es) will be included with all boxes for a single air measurement station banded together at
the factory to simplify the process of receipt inspection.
Note: care should be taken to keep all Host monitors, Client monitors, and sensor cable assemblies for each system together, especially
if there are multiple air measurement stations.
I&M: Figure 6
* (2) Sensor Cable Assemblies
per Fan (10 ft or 25 ft options)
10 ft Standard
** Client Power/Data
Cable Assemblies.
(18 in, 32 in, 44 in, 50 in,
10 ft, and 25 ft options)
*** Remote Host Power/Data
Cable Assemblies
(10 ft, 25 ft, and 50 ft options)
IMPORTANT!
The Remote HOST must be
located external to the air
stream. The interface must
be accessible during normal
operation & field calibration.
CONFIGURATION:
3 FAN / 2 SENSORS PER FAN
With Remote Host

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REMOTE HOST COMMUNICATIONS CABLE (if REMOTE HOST option is selected and if configuration includes a Client
monitor box.)
1. Available in 10 ft, 25 ft, and 50 ft lengths; 10 ft is Standard.
2. REMOTE HOST communication cable connects the remote host with the nearest Client box; if applicable.
3. REMOTE HOST Monitor box does not include sensor Boom Arm Assemblies. All sensors will be connected to Client monitor boxes.
CLIENT COMMUNICATION CABLE
1. Available in 18”, 30”, 44”, 50”, 10ft, and 25ft lengths; 50” is Standard
2. CLIENT communication cables connect one Client monitor box to another Client monitor box and also from the local HOST monitor
box to the nearest Client monitor box.
3. For applications which include a local HOST monitor box and one or more Client monitor boxes, one 25ft length of power/data
(communication) cable will be provided as Standard to connect the local HOST monitor box to the nearest Client monitor box.
SENSOR CABLE ASSEMBLY (For local HOST or CLIENT Monitor Boxes)
1. Available with 1 or 2 per HOST/CLIENT Monitor Box
2. Available in 10ft or 25ft lengths.
NOTE: Sensor Cable Assemblies for local HOST monitor boxes are provided in 25ft lengths, as Standard.
3. Each sensor cable assembly includes two (2) mounting clamps (Standard)
HOST Monitor Box or REMOTE HOST Monitor Box
The Ruskin TDFi-RT system includes the following standard or
optional components/configurations:

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1. 1 sensor housing assembly per sensor cable assembly.
2. The sensor housing assembly is shipped with the sensor opening positioned properly on the boom arm. However, the sensor housing
can be rotated on the boom arm in the field ± 90° from the factory-set position to ensure the airflow passes directly through the
sensor opening in its final install position.
3. Airflow can pass through either side of the sensor opening.
MONITOR BOX ENCLOSURE
1. Available with NEMA 1 (Standard) or NEMA 4 (Optional)
2. Applies to all REMOTE HOST, HOST, and CLIENT Monitor Boxes
ACCESSORIES
1. Optional - Cord Grips (2)
TRANSFORMER
1. Optional: ZG-X40 (24VAC, 40VA)
2. Optional: IAQ080 (24VAC, 100VA)
SENSOR HOUSING ASSEMBLY

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IDENTIFYING LOCATION TO MOUNT HOST MONITOR BOX (REMOTE OR LOCAL HOST)
Once it is determined that all components are accounted for, the first step is to select the location where the HOST Monitor box (User
Interface) will be mounted. This location must be external to the fan plenum area so that the user interface is easily accessible and viewed
while the fan(s) are in operation. Access doors that would affect airflow through the fan(s) must be closed and all fan guards and safety
guards must be in place during the calibration process while the fan(s) are in operation.
The menu buttons on the HOST Monitor box (User Interface) must be accessible during the setup and calibration process while the fan(s)
are run through their full range of airflows. If the airflow measurement station was supplied with a local HOST monitor box with either
one (1) or two (2) sensor cable assemblies, select a location for the HOST monitor box that is within the length of sensor cable(s) supplied
with the sensor cable assembly. The local HOST will come with sensor cable assembly lengths of 25ft, as Standard.
Unlike a HOST monitor box, a CLIENT monitor box can be installed inside the fan plenum area (in closer proximity to the fans). Depending
on the number of fans and the equipment supplied, the TDFi-RT can be installed with one or two sensors per fan for any number of fans
that make up an array. Use two sensors on a single inlet fan (SWSI) or a dual inlet fan (DWDI). On dual inlet fans (DWDI), only two sensors
are required and are to be mounted on the “non-pulley” side of the fan.
A REMOTE HOST, when supplied with CLIENT box(es) can be installed remotely up to 500ft away and connected to the CLIENT using
a twisted shielded pair network wire suitable for Modbus type networks or use Connect-Air part number W24182P-2306BL with
communications and power in one cable.
LOCATING THE BOOM ARM AND SENSOR ON THE FAN INLET
Inspect the fan inlet opening to ensure no obstructions or irregularities interfere with installation of the sensors. When the TDFi-RT
configuration includes a HOST and CLIENT monitor box(es), the CLIENT monitor box(es) are intended to be installed in the fan plenum
areas and wired to a local or remote HOST monitor box. All monitor boxes (HOST and CLIENT) must be mounted away from VFD drives
and as far as possible from high voltage wiring. Boxes must be mounted on on a solid, secure surface that is free from vibrations.
Mount the boom arm onto the face of the fan (inlet bell/flare) using the vibration dampening loop clamps supplied (two clamps included
per sensor cable assembly). Space the clamps on boom arm according to the table below to minimize to minimize effects of vibration on
the sensor housing assembly.
NOTICE: Locate the local HOST within reach of the sensor cable assembly that is mounted to the fan inlet. Sensor cable assembly
lengths of 25 ft are provided as Standard for the local HOST monitor box.
WARNING
Do NOT install HOST or CLIENT monitor boxes near VFD drives or near high voltage wiring.
!
Fan Inlet Diameter (D) 10" up to 22" Above 22"
thru 28"
Above 28"
thru 34"
Above 34"
thru 40"
Above 40"
thru 46"
Above 46"
thru 48"
Minimum / Default
Boom Arm Length (L) 6" 8" 10" 12" 14" 16"
Minimum Clamp Spacing 3" 3" 4" 4" 5" 6"

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The sensor should be cantilevered into the airstream such that the sensor opening is positioned on the circumference of an imaginary
circle that measures two-thirds of the fan’s inlet diameter (D). Adjust the boom arm assembly so that the sensor is as deep into the throat
of the fan inlet as possible without interfering with the operation of the fan. When properly installed, the sensor should be positioned a
distance of one-sixth of the fan inlet diameter (D) from the edge of the fan inlet. (Y = 1/6 x D)
For example, when mounting a boom arm assembly onto a fan with an 18 inch diameter inlet (D), the sensor should be located 3
inches (18 ÷ 6 = 3) from the internal edge of the fan inlet.
NOTE: Locating the sensor within ±1 inch of the ideal ‘Y’ position is acceptable for achieving proper airflow measuring performance.
For installations that will include one sensor per fan, the boom arm assembly can be mounted at any location around the circumference
of the fan. Position the sensor at a 90° angle (perpendicular) to the tangent of the fan’s circumference.
X = Distance between centerline of fan and recommended sensor placement = 1/3 0f Fan Inlet Diameter ‘D’
Y = Distance from edge of Fan Inlet Diameter to the recommended sensor placement = 1/6 of Fan Inlet Diameter ‘D’
Fan Inlet Diameter
‘D’
‘Y’
‘Y’
‘X’
‘X’
Sensor Boom
Arm Assembly
Edge of Inlet ‘Flare’ Flat Face of Fan Inlet

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When installing one sensor per fan of a fan array, mount the boom arm assemblies at alternating positions from one fan to another. For
example, one boom arm assembly should be mounted on the left side of the fan #1 (from 6 o’clock position to the 12 o’clock position)
and the boom arm assembly on an adjacent fan #2 should be mounted on the right side of the fan (from 12 o’clock position to the 6
o’clock position).
For installations that include two sensors per fan, the sensors should be located 180° apart from each other…when possible. For fans with
top or bottom airflow discharge locations, the ideal sensor location would be at the 3 o’clock and 9 o’clock positions; and for fans with
left or right airflow discharge locations, the 12 o’clock and 6 o’clock locations would be ideal. However, any point on the circumference
of the fan will be acceptable if the ideal position is not possible due to interference.
Avoid placement of the sensors downstream from objects that are present in the airstream at the fan inlet. Airstream disturbance
should be avoided to achieve a stable and repeatable airflow measurement by positioning the sensors as far as possible from existing
obstructions (turbulence) in the air entering flow pattern.
The design of the TDFi-RT will fully compensate during the calibration process for normal variance in sensor placement. However, it is
critical that the sensor opening is positioned correctly after the boom arm assembly has been secured so that you can see directly through
the sensor into the fan.

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CONNECTING THE SENSOR CABLE ASSEMBLY TO THE HOST
OR CLIENT MONITOR BOX
With power OFF, connect the fan inlet sensor to the ports on the HOST or CLIENT monitor
box marked EJ-1 and EJ-2. To plug in the sensor cable, match up the black arrow on the
monitor box label with the arrow on the cable over-mold.
After the connector pins of the cable are aligned with the socket, insert the cable pins
into the socket. The knurled ring can then be rotated clockwise to tighten and secure the
cable to the socket connection. Finger-tighten only to avoid damage to the components.
When connected properly using only finger-tight torque, the connection will prevent
moisture from entering the connector and the sensors from becoming accidentally
disconnected from the monitor box.
WIRING
Comm Cable Specifications
For ease of installation, Connect-Air part number W24182P-2306BL with communications
and power in one cable is recommended. Alternatively, use a twisted shielded pair 24
AWG low capacitance wire communications cable and an 18 AWG power cable.
Note: Do not kink the supplied blue interconnection wires. In an exposed or conduit
installation, the wiring minimum bend radius is 1.5 inches (38 mm).
Sensor Cable Assemblies
Note: Do not kink or pinch the supplied white sensor cabling as this will affect
performance. Do not apply tensile stress to the cabling as this could lead to damage
of the cable-sensor connection and ultimately lead to sensor failure. Care should be
taken to ensure the cabling does not exceed the minimum bend radius (especially at the
point where the cable enters the boom arm (see below) as this could result in damage
to the wire insulator and sensor failure. In an exposed or conduit installation, the wiring
minimum bend radius is 1.5 inches (38 mm).
Failure to install the sensor cable assembly completely and fully into the EJ-1/EJ-2 socket will result in failed calibrations and system
configuration.
IMPORTANT: Improper sensor installations will result in FAILED calibrations!

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Typical Wiring Configuration
CLIENT Monitor Box
CLIENT Monitor Box
HOST Monitor Box
Fan
Network
Power
Power
Power
Shield Out
Analog out
Fan
Network
Fan
Network
WIRING CONNECTIONS
IMPORTANT: Do not run the probe wiring in the same conduit as other AC power wiring or with wiring used to supply highly inductive
loads, such as motors, contactors, and relays. Fluctuating, erratic, and inaccurate signal levels are possible when AC power wiring is
present in the same conduit as the signal lines. Run the wiring away from variable frequency drives or broadcast antennas.
Host 24VAC
24H
24H
24H
24H
24H
24H
Probe
Network
Shield
COM
D- D-
A- A-
D+
+
+
+
-
-
-
D+
B+ B+
BACNET
OUT
OUT
OUT
OUTIN
IN
IN
IN
24G
24G
24G
24G
24G
24G
BAS
White
White
Black
Black
Black
Black
Shield Gnd 1-end only
Shield Gnd 1-end only
Red
Red
A01 A02 A03
Shield
Shield D-
D- D+
D+
D-
D- D+
D+
Client 0
Client F

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HOST AND REMOTE HOST MONITOR BOX
HOST AND REMOTE HOST MONITOR BOX FEATURES
IMPORTANT: The HOST provides two 4-20mA signals to building automation systems. Do not apply loop power to the HOST or
REMOTE HOST monitor boxes. The system requires a two-wire power connection and separate two-wire connections for each analog
output. Analog outputs are isolated from power; therefore, 3 wire connections will NOT work correctly.
Callout Feature Description
1 Reset Cycle power to the device without unplugging it. A power cycle is required to reset overload
protection and output short circuit.
2 499 Ohm Resistor(s)
To convert the output from 4-20mA to a 2-10VDC output, install a 499 ohm resistor across the
+ and - terminals of the A01 or A02 output. Two 499 ohm resistors are taped to the inside of
each Host enclosure.
Analog Output
1. Carefully remove the top of the Phoenix Contact screw terminal connector and insert the wires. Tighten the terminals and reconnect
them to the monitor board.
2. Connect the 4-20mA analog flow output (A01: Pos and Com) and the 4-20mA analog output factory default temperature (A02:
temperature output) from the HOST to the building automation system.
Note: The factory default flow output is A01. Either output A01 or A02 can be configured for temperature or flow, or both can be
configured for temperature and/or flow.
Probe Network
Connect the Shield, D-, and D+ from the HOST monitor to the CLIENT monitor using the approved communications wire. A03 is not used
at this time.
Note: The two D- and the two D+ connections are electrically identical.
BACnet Output
1. Carefully remove the top of the Phoenix Contact screw terminal connector and insert the wires. Tighten the terminals and reconnect
them to the controller board.
2. Connect the BACnet output (A- and B+) from the HOST to a BACnet network.
3. Connect the shield wire from the HOST to the Shield terminal.
Note: The two A- connections and the two B+ connections are electrically identical.
Not Shown: Two (2) 499 Ohm
resistors in plastic bag secured to
the inside of the HOST monitor box.

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Power
1. Carefully remove the top of the Phoenix Contact screw terminal connector and insert the wires. Tighten the terminals and reconnect
them to the controller board.
2. Connect the 24VAC from power source to the HOST; and daisy chain the power from monitor box to monitor box.
3. Connect the 24VAC hot wire to the HOST monitor box terminal labeled 24H.
4. Connect the 24VAC common wire to the HOST monitor box terminal labeled 24G.
Note: The two 24H connections are electrically identical; and the two 24G connections are also electrically identical.
Network
1. Carefully remove the top of the Phoenix Contact screw terminal connector and insert the wires. Tighten the screw terminals and
reconnect them to the circuit board.
2. Connect the probe network terminal from the HOST to the network terminals in the CLIENT monitor box.
a. The shield only connects on one end.
b. Connect the 24 AWG black wire from the HOST monitor box terminal labeled Network D- to the CLIENT monitor box terminal
labeled Network D-.
c. Connect the 24 AWG white wire from the HOST monitor box terminal labeled D+ to the CLIENT monitor box terminal labeled
Network D+.
3. Connect additional CLIENT monitor boxes in a daisy-chain series.
Note: The last client in each airflow measuring station can have the end of line (EOL) switch set for the network (switch 3; see Figure X).
If the HOST is connected to a BACnet network interface and the Advanced Thermal Dispersion Airflow Measuring System is at the end of
line in the BACnet network, set the BACnet EOL switch to 1 ON (shown in the OFF position in Figure X).
CLIENT MONITOR BOX FEATURES
Callout Feature Description
1 Reset Cycle power to the device without unplugging it.
2Monitor Box Address
Rotary Switch
Sets the address for each Client monitor box on the network. The rotary switch is set at the
factory for each system. Note: Duplicate addresses are not allowed on the network. HOST
monitor box does not require or have an address.

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Power
Note: Each CLIENT monitor box requires power and can be powered from the same source as the HOST monitor box. Observe polarity to
prevent a direct short. Two power connections are provided and are electrically the same. These connections can be used interchangeably
to connect additional CLIENT monitor boxes.
1. Carefully remove the top of the Phoenix screw terminal connector and insert the wires. Tighten the screw terminals and plug into to
the circuit board.
2. Connect the 18 AWG copper red wire from the HOST monitor box terminal labeled 24H to the CLIENT monitor box terminal labeled
24H.
3. Connect the 18 AWG copper black wire from the HOST monitor box terminal labeled 24G to the CLIENT monitor box terminal labeled
24G.
Completing the Wiring
When the HOST and CLIENT monitor box wiring is complete, apply power to the system.
When power is applied, the firmware version number will be displayed along with the number of Monitor boxes (MON) and the total
number of sensors.
Example:
Configure Settings At Power-Up (if not already configured or Factory Default was performed)
Example: Config System?
»Select YES
Number of Fans?
»Select the Number of Fans
Number of Sensors per Fan?
»Select the Number of Sensors per Fan
Enter to Configure (Fan 1, Fan 2, etc.)
»Assign the appropriate Monitor Box with the associated Fan Number
Confirm this information is correct for the airflow measurement system installed. If it is incorrect, check all network wiring and CLIENT
address dial settings. Confirm that no two CLIENT monitors are set for the same address. Each CLIENT address setting must be unique on
the network to work correctly. The HOST monitor box address is hard-coded and does not need to be changed or addressed. Confirm the
connections are made to the network and are not to the BACnet or analog output connections on the HOST. After the device warms up,
the temperature and flow readings will be displayed.
IMPORTANT: Confirm the connections are made to the network and are not to the BACnet or analog connections on the HOST. After
the device warms up, the temperature and flow readings will be displayed.
Refer to the TDFi-RT Advanced Thermal Dispersion Fan Inlet Airflow Measuring System TECHNICAL BULLETIN for detailed configuration
instructions. http://www.ruskin.com/model/tdif-rt
The next screen will then populate with the number of Monitors and Total Sensors that the system has identified.
Example:
FACTORY CONFIGURATION NOTE: Each airflow measuring station is factory configured for the equipment included. If necessary,
the display will prompt user to enter the number of fans and the number of sensors per fan. If the airflow measuring station is NOT
configured or a ‘Factory Defaults’ has been performed, a manual configuration will be required.

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Resetting Factory Default Fan Configurations - Supervisor Menu
Example: Enter the Supervisor Menu
»Select ‘Fan Array Config’
• Number of Fans
› If necessary, using the UP or DOWN buttons to match the correct number of fans in the system.
• Number of Sensors per Fan
› If necessary, using the UP or DOWN buttons to correct number of sensors per fan.
• Set Fan Sensors
› If necessary, using the UP or DOWN buttons to correct the associated fan number with its respective
Monitor box.
CONFIGURATION NOTE: Select Monitor #. This can be MON H for the HOST box or hex address MON 0 through MON F for CLIENT
box(es).
NOTE: The HOST monitor box is a hard-coded address in firmware. Changing the rotary switch address selector in the HOST enclosure
is NOT REQUIRED.
The serial number on the outside of the CLIENT box ends with the factory preset rotary’s address. Addresses can be changed if necessary,
using the Rotary switch in the CLIENT enclosures only.
With boom arms mounted, sensors properly located within fan inlet, and the configuration process noted above completed, the TDFi-RT
will display an increasing airflow when the fan speed is increased.
The airflow displayed is only an indication of changing airflow and is not an accurate airflow measurement until the calibration
steps have been successfully completed at known airflows.

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IMPORTANT: It is critical that the calibration process be completed using actual system airflows. Individual site Calibration is REQUIRED.
FAN CALIBRATION PROCEDURES
When power is initially applied for the first time, the air measurement station is NOT calibrated. Each TDFi-RT fan inlet airflow measurement
station must be field calibrated by running the fan at one, two, or three known airflow values or using airflow measurements provided by
Test & Balance (T&B) contractor. It is recommended to record damper positions (if applicable) and drive speeds while T&B is on site to
facilitate recalibration anytime measurement equipment must be moved or replaced.
It is necessary to manually go through the following steps to enter calibration mode.
For Single Fan or Fans of Various Diameters
1. Enter the SUPERVISOR Menu
a. Select ‘Field Cal Config’
i. Select Fan #
1. Using the UP or DOWN buttons, select the associated Fan.
i. Using the UP or DOWN buttons, select Field Cal ‘On’
c. Select Use Calc’d Cal?
i. Using the UP or DOWN buttons, select ‘Yes’
d. Select Run Auto Cal
Note: Only the number of selectable Fans on the system can be calibrated. If an expected Fan association is not
present, you will need to configure the Fan using the ‘Fan Array Config’ feature located under SUPERVISOR Settings.
b. Select FCal Enable?

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i. ‘Press Enter to Calibrate’ will be displayed. Press ENTER.
ii. Site ‘Fan Diameter’ will be displayed. Using the UP or DOWN buttons, enter the associated Fan Diameter as measured
where the sensors are installed. Press ENTER.
iii. ‘Calc’d Area’ will be displayed. Press ENTER.
Note: The SqFt value displayed is calculated from the Fan Diameter entered above. Enter a custom SqFt value if different from
the calculated value from the Fan Diameter entry. The HOST will reverse calculate the NEW Fan Diameter if the SqFt is changed
by the user. Changing the SqFt setting will also change the Design Range High value as well for the Flow Analog Output.
e. ‘Select # of Pnts’ is displayed
f. Measured Point 1 is displayed
i. Run the fan at the Minimum Airflow.
1. After the fan has reached the minimum airflow, use the UP or DOWN buttons to select the airflow value of the desired
‘Calibration Points’. Press ‘ENTER’
g. (If applicable) Measured Point 2 is displayed.
i. Run the fan at the Medium Airflow.
1. After the fan has reached the medium airflow measured, use the UP or DOWN buttons to select the airflow value of
the desired ‘Calibration Points’. Press ‘ENTER’
h. (if applicable) Measured Point 3 is displayed.
i. Run the fan at the Maximum Airflow possible.
1. After the fan has reached the highest airflow, use the UP or DOWN buttons to select the airflow value of the desired
‘Calibration Points’. Press ‘ENTER’
i. Using the UP or DOWN buttons, select the number of the desired ‘Calibration Points’. Press ENTER.
Note: 3, 2, or 1 Calibration Points are available for selection.
1-Point is used for fixed speed fans.
2-Point is used with a min airflow (not Zero) and a max airflow.
3-point is used with a min airflow (not Zero ), a medium airflow that is half-way between the min airflow and the max airflow,
and a max airflow. Max airflow is all that the fan can possibly generate if the VFD is being driven past 60Hz.
IMPORTANT: The minimum calibration value is NOT Zero and must be a point to the right of the fan’s performance curve.
CALIBRATION NOTE: If the HOST is the automation interface for more than one airflow measurement station on different AHUs or the
same AHU’s supply and return fans, repeat the steps above for each airflow measurement station.
For Fan Arrays of Same Diameter
1. Enter the SUPERVISOR Menu
a. Select ‘Fan Array Config’
b. Select ‘Fan Array Cal’
i. Site ‘Fan Diameter’ will be displayed. Using the UP or DOWN buttons, enter the array’s fan inlet diameters for one fan as
measured where the sensors are installed. Press ‘ENTER’.
ii. ‘Calc’d Area’ will be displayed. Press ‘ENTER’
Note: The SqFt value displayed is calculated from the fan diameter entered above.
c. ‘Press Enter to Calibrate’ will be displayed. Press ‘ENTER’
d. ‘Select # of Pnts’ is displayed.
i. Using the UP or DOWN buttons, select the number of desired ‘Calibration Points’. Press ‘ENTER’.