Greenheck Sure-Aire 386719 User manual

®
Sure-Aire™ Flow Monitoring System 1
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Document 1021624
Sure-Aire™ Electronics
User and Service Manual
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
Sure-Aire™ Electronics Features:
• LCD display with user-friendly touch panel interface
• NEMA-4 / IP56 enclosure rating
• Factory calibrated
• Programmable elevation
• English or metric readings
• 24 VAC / DC or 100-240 VAC 50 / 60Hz input voltage
• Part numbers and pressure ranges:
386719 – 0-4.15 in. wg
386720 – 0-8.30 in. wg
386721 – 0-22.14 in. wg
386722 – 0-41.52 in. wg
386723 – 0-83.14 in. wg
386724 – 0-138.40 in. wg
• Isolated output, linear to differential pressure or
volume
4-20 mA
2-10 VDC
• Communication protocols
BACnet MSTP
Modbus
• Temperature compensation for air density
Tools Required
• Four (4) #8-32 screws
• 1/4-inch nylon tubing (length dependent on
distance between fan and Sure-Aire electronics,
maximum 75 feet (23 m) each line)
• Sensor wiring for temperature sensor (if
temperature sensor is being used)
Pressure ranges reflect differential pressures between
the fan inlet and inlet cone, not system static
pressure.
Flow Accuracy – Within +/-3.0% of actual flow
Transducer in Electronics
• Accuracy +/- 0.5% of full scale at 77ºF (25ºC)
• Pressure limit: 70 psi (1938 in. wg)
• Thermal effects: 0.015%/°F (0.027%/°C) from -13°
thru 185°F (25° thru 85°C)
Label Information
WARNING
Improper installation, adjustment, alterations,
service or maintenance may cause injury and / or
property damage, as well as possibly void the
factory warranty. No person may install, operate,
or maintain a Sure-Aire™ electronics without first
being fully trained and qualified in the installation,
operation and maintenance, and carefully reading and
understanding the contents of this manual. If you have
any questions about these instructions, contact your
local representative.
CAUTION
Risk of electrical shock! More than one disconnect
switch may be required to de-energize the equipment
before servicing.

Sure-Aire™ Flow Monitoring System2
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This instruction manual provides installation, operating, maintenance, and other information for the Sure-Aire™
electronics.
Receiving
Upon receiving the electronics, check to ensure all items are accounted for by referencing the packing list. Inspect
each crate or carton for shipping damage before accepting delivery. Alert the carrier of any damage detected. The
customer will make notification of damage (or shortage of items) on the packing list and all copies of the bill of lading
which is countersigned by the delivering carrier. If damaged, immediately contact your local sales representative.
Any physical damage to the unit after acceptance is not the responsibility of the manufacturer.
Unpacking
Verify that all required parts and the correct quantity of each item have been received. If any items are missing,
report shortages to your local representative to arrange for obtaining missing parts.
Storage
Electronics are protected against damage during shipment. If the electronics cannot be installed and operated
immediately, precautions need to be taken to prevent deterioration during storage. The user assumes responsibility
of the electronics and any accessories while in storage. The manufacturer will not be responsible for damage during
storage. These suggestions are provided solely as a convenience to the user.
The ideal environment for the storage of electronics is indoors, above grade, in a low humidity atmosphere which
is sealed to prevent the entry of blowing dust, rain or snow. Temperatures should be evenly maintained between
30°to 110°F (-1° to 43°C). Wide temperature swings may cause condensation and “sweating” of metal parts. All
accessories must be stored indoors in a clean, dry atmosphere.
Removing from Storage
As electronics are removed from storage to be installed in their final location, they should be protected and
maintained in a similar fashion until the control goes into operation. Environmental Operation Range: -4°to 140°F
(-20° to 60°C).
1. Mount the electronics in the vertical plane using
four(4) #8-32 screws, field supplied. Open the front
cover by unscrewing the two captive thumb screws
to gain access to the four mounting locations.
Note: Mount the Sure-Aire™ electronics within
75feet of the fan.
WARNING
When wiring the electronics, you must follow industry
standard practices for controls and protect against
electrostatic discharge (ESD). Failure to exercise good
ESD practices may cause damage to the electronics.
General Information
Installation
4-5/32 in.
(105.6 mm)
5-3/8 in.
(136.5 mm)
3-9/32 in.
(83.3 mm)
5 in.
(127 mm)
2. Use 1/4-inch nylon tubing to connect the
corresponding High (H) and Low (L), 1/4-inch
quick connect, pressure ports of the Sure-Aire™
electronics to the high and low pressure ports on the
fan.
3. Connect supply power:
Two input power options are available: 24 VAC/DC
or 100-240 VAC. The wiring for each can be seen
on page 4. For liquid tight applications, use only
1/2-inch liquid tight conduit.
Power connection
High (H)
Low (L)
Wiring connection

Sure-Aire™ Flow Monitoring System 3
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4. Optional Wiring Connections:
4.1 Analog Output Signal:
Both 4-20mA and 2-10VDC are available. Connect signal wire into corresponding terminals on block TB3. If
using 4-20mA, a load resistor between 200 and 900 ohms is required, field supplied. If two or more outputs
share a common connection, a signal isolator may be required.
Update settings within electronics (see page7): Use the touch screen to select the 4-20mA or 2-10 VDC
output signal via the setup menu.
4.2. Network Protocol:
Both BACnet MSTP and Modbus RTU are enabled. Connect appropriate wiring to block TB3. Adjust switch,
SW1, to 2-wire (left) or 4-wire (right) as required. Reference network protocol section for more information.
Update settings within electronics (page7):
Switch SW1: 2-Wire / 4-Wire
Select:
• Left Position = 2-Wire
• Right Position = 4-Wire
4.3. Temperature Density Compensation:
Temperature compensation can adjust airflow calculation based on changing airstream temperatures. If
temperature compensation is not used, the air density value will be a function of standard air (70°F / 21°C).
The supplied sensor measures the exterior temperature of the ductwork, only screw holes are required.
Mount the sensor in contact with the ductwork.
Wire the temperature sensor into corresponding terminals on block TB3 (wiring supplied by others).
Update settings within electronics (page5): In the setup menu change Temperature Compensation to “Yes”.
Confirm that this is set to “Yes”.
5. Close and tighten screws on cover:
When the required preceding steps are complete, make sure the front cover is properly aligned to the housing
and the two captive thumb screws are securely tightened.
Installation (continued)
Wiring Diagram

Sure-Aire™ Flow Monitoring System4
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Air Flow Units: Press “Edit” to change Air Flow Units.
Press “Prev” or “Next” to adjust, then press Enter to
store the value.
• CFM (default)
• m³/hr
• m³/min
Pressure Units: Press “Edit“ to change pressure units.
Press “Prev“ or “Next“ to adjust, then press “Enter“ to
store the value.
• In. wg (default)
• Ft wg
• mm wg
• cm wg
• PSI
• In. Hg
• mm Hg
• mBar
• Pa
• kPa - kilopascals (1kPa = 1000 Pa)
• hPa - hectopascals (1hPA = 100 Pa)
• Oz. In.
Temperature Compensation: Press “Edit“ to change
Temperature Compensation. Press “Prev“ or “Next“ to
adjust, then press “Enter“ to store the value.
• Yes (default)
• No
Note: If temperature compensation is set to “No“, the
air density will be a function of standard temperature
(70°F / 21°C).
Analog Output Signal: Press “Edit“ to change Output
Signal type. Press “Prev“ or “Next“ to adjust, then press
“Enter“ to store the value.
• 4-20 mA (default)
• 2-10 VDC
Linearize By: Press “Edit“ to change the linearization
settings. The electronics will linearize the electronics
output with respect to this setting.
• Flow (default)
• Pressure
Note: The maximum measurable flow rate will
automatically calculate based on the electronics
settings. The maximum flow rate is displayed on the
screen.
Navigation Buttons
The electronics is equipped with a touchscreen LCD
display. There are 4 navigation buttons on the bottom
of the screen. Button names will change based on the
parameter you are in (i.e. “Setup” will change to “Home”
and “Home” will change to “Edit”).
Home Screen
To view the different settings use the “Up” and “Down”
buttons to scroll through the list. To adjust settings,
press “Setup” and scroll through the settings. Below is
information on the adjustable settings.
Settings Menu
Home Screen: Top/Bottom View: Press “Edit“ to
change Main Display Value. Press “Prev“ or “Next“ to
adjust what reading displays on the Home screen, then
press “Enter“ to store the value.
• Flow (default)
• Pressure
• Temperature
• Air density
• Output signal (default bottom display)
• Velocity
• None
Measurement System: Press “Edit“ to change the
measurement system units. Press “Prev“ or “Next“ to
adjust, then press “Enter“ to store the value.
• English (default)
• Metric
K-Factor: Press “Edit“ to change K-Factor. Press “Inc“
or “Dec“ to adjust, then press “Enter“ to store the value.
• 200 to 30,000
Elevation: Press “Edit“ to change elevation. Press “Inc“
or “Dec“ to adjust, then press “Enter“ to store the value.
• 0 - 10,000 ft
(0 ft default)
Outlet Area: Press “Edit“ to change the stack outlet
area. Press “Inc“ or “Dec“ to increase or decrease the
area, respectively. Then press “Enter“ to store the value.
• 0-10 Ft²
Display Brightness: Press “Edit“ to change brightness.
Press “Inc“ or “Dec“ to adjust, then press “Enter“ to
store the value.
• 10 - 100%
(80% default)
Greenheck
Sure-Aire V 2.00
0.0010 CFM
3.96 mA
Setup Up Down Home
Display Setting Options and Setup
WARNING
Due to load resistance change from product to
product, it may be necessary to recalibrate the
4-20mA electronics. See 4-20 mA transducer
calibration procedure.

Sure-Aire™ Flow Monitoring System 5
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Network Protocol: See page 7. Select the appropriate protocol, baud rate and network address.
Go to Network Protocol - Optional for detailed instructions.
Defaults
Load Factory Defaults: Press “Edit“ to load factory defaults. Press “Prev“ or “Next“ to select “Yes“,
then press “Enter“.
• No (default)
• Yes (changes all settings to factory default)
Load Customer Defaults: Press “Edit“ to load customer defaults. Press “Prev“ or “Next“ to select “Yes“,
then press “Enter“.
• No (default)
• Yes (loads all customer default settings)
Save Customer Defaults: Press “Edit“ to save current electronics settings as the customer default.
Press “Prev“ or “Next“ to select “Yes“, then press “Enter“.
• No (default)
• Yes (saves current settings as the customer default)
Display Setting Options and Setup (continued)
Network Protocol - Optional
Greenheck’s Sure-Aire™ electronics has the ability to connect to a customer’s Building Automation System (BAS)
through the on-board RS-485 port. The electronics can be configured as either BACnet MS/TP or Modbus RTU
Slave. When in the display menu, scroll through the options until the Network Protocol screen. Pressing edit will
permit changing the network protocol type and associated data. This information should be set to match the BAS.
BACnet MS/TP Server
When the electronics is configured for BACnet, it will
expose a total of eight (8) objects on the network.
BACnet MS/TP Server Device Settings
Setting Value
Baud Rate Set to match BMS
Parity No Parity (1 Stop Bit)
APDU Timeout (ms) 1000
Number of APDU Retries 3
Max Master Address 127
Max Info Frames 1
Modbus RTU Slave
When the electronics is configured for Modbus, it will
expose a total of seven (7) registers on the network. The
Modbus RTU Slave settings and list of registers can be
seen below.
Modbus RTU Slave Device Settings
Setting Value
Baud Rate Set to match BMS
Parity No Parity (1 Stop Bit)
Timeout (ms) 0
Response Delay (ms) 0
BACnet MS/TP Server Objects
Object Name Object Type Data Type Units
Sure-Aire™ Device Object N/A N/A
K-Factor Analog Input 16-Bit
Unsigned None
Elevation Analog Input 16-Bit
Unsigned None
Outlet Area Analog Input 32-Bit Floating
Point None
Flow
Temperature Analog Input 16-Bit Signed None
Pressure Analog Input 32-Bit Floating
Point None
Volume Analog Input 32-Bit Floating
Point None
Velocity Analog Input 32-Bit Floating
Point None
Modbus RTU Slave Registers
Register Name Register Type Data Type Units
K-Factor Input Register 16-Bit
Unsigned None
Elevation Input Register 16-Bit
Unsigned None
Outlet Area Input Register 16-Bit
Unsigned None
Flow
Temperature Input Register 16-Bit Unsigned None
Pressure Input Register 16-Bit
Unsigned None
Volume Input Register 16-Bit
Unsigned None
Velocity Input Register 16-Bit
Unsigned None
NOTE
All of the objects / registers that are exposed on the network do not have a unit associated with them. The units of
the values exposed on the network will be based on the units that are selected on the Sure-Aire™ electronics.

Sure-Aire™ Flow Monitoring System6
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Greenheck’s Sure-Aire™ differential pressure electronics provides either a 2-10 VDC or 4-20 mA analog output
signal. The output signal can be configured linearly proportional to either the pressure range or the flow within the
setup. The ranges for Greenheck’s Sure-Aire™ electronics are listed by model on cover.
Contact factory for monitor part number and pressure range if retrofitting.
Transducer by Third Party or Manual Calculation
Flow Rate Equation
The volumetric flow through the fan (cfm) can be calculated from the equation:
where K is the K-Factor for the specific fan model and size, ΔP is the measured differential pressure across the inlet
cone (in. wg), and is the density of air (lb/ft3).
CFM = K
ΔP

Voltage and Amperage Signal
If using the analog signal linear to flow, the max flow is automatically calculated based on the pressure range and
K-factor input into the electronics. The max value is displayed in the setup menu.
If output signal is linear to pressure, the corresponding equations are used to calculate the flow.
Calculating flow for 2-10 VDC output signal:
Calculating flow for 4-20 mA output signal:
CFM = K
(V - 2) Pmax
8

CFM = K
(mA - 4) Pmax
16

Analog Output Signal - Optional
K Constant dependent on fan model and size (see page 9)
Pmax Maximum pressure of electronics (in. wg)

Airstream air density (lbs/ft³)
V Output voltage of 2-10 VDC signal
mA Output current of 4-20 mA signal

Sure-Aire™ Flow Monitoring System 7
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Recalibration Procedure
The electronics are calibrated per order at the factory. Under certain circumstances, there may be a discrepancy
of calibration once installed on site. The following procedure is used to re-calibrate the pressure trandsucer within
the electronics. In the event an error occurs trying to re-calibrate, the tranducer parameters can be re-set to factory
settings using “Load Factory Settings” within the setup menu.
Equipment
Digital multimeter.
Vacuum pressure device with gauge (only needed if calibrating upper range).
200-900 ohm resistor (only needed if calibrating using 4-20 mA).
Procedure
1. Remove power to the electronics.
2. Remove any wires connected on the analog outputs.
3. Remove tubing from Sure-Aire™ electronics box, box uses push-to connect fittings.
4. Connect multimeter to analog points on terminal strip. If calibrating using 4-20 mA, a series load resistor
between 200 and 900 ohms is required.
5. Set multimeter to the correct measurement units, VDC or mA.
6. Apply power to the Sure-Aire™ electronics.
7. Press the “Setup“ button on the LCD panel.
8. Verify the analog signal is setup for your measurement and that the signal is linear to Differential Pressure.
9. Go to the “Trans Min/Trans Max” screen. Record the values for each. It is correct that the trans min value is
higher than the trans max value.
10. Press “Enter / Edit”.
11. With all tubing removed, adjust the trans min value up/ down until the multimeter reads either 2 VDC or 4 mA.
12. Press “Next” if only calibrating low value. Press “Enter” to complete.
13. To calibrate upper range, apply the pressure device to the high port and pull vacuum to maximum pressure on
Sure-Aire™ label.
14. Adjust the trans mix value up/down until the multimeter reads either 10 VDC or 20 mA.
15. Press “Enter” to store the new value.
16. Press “Exit” to return to the main screen.
17. Optional: go to “Save Customer Defaults” and save for future resetting to the changes.

1021624 • Sure-Aire™ User and Service Manual, Rev. 1, October 2020 Copyright 2020 © Greenheck Fan Corporation8
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
®
Phone: [phone] • Fax: [phone] • Parts: 800.355.5354 • E-mail: [email protected] • Website: www.greenheck.com
Our Commitment
AMCA Publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans, provides
additional safety information. This publication can be obtained
from AMCA International, Inc. at www.amca.org.
Greenheck’s Sure-Aire™ Flow Monitoring System catalog
provides additional information describing the equipment, fan
performance, available accessories, and specification data.
K-Factors
Size APD Size APH / APM
HPA AFDW / BIDW FJI QEI / QEID
USF-500
& Vektor-C
series
Vektor-H series Vektor-M series
315 257 7 not applicable not applicable 179 not applicable 179 not applicable not applicable
355 329 8 not applicable not applicable 179 not applicable 179 not applicable not applicable
400 406 9 not applicable not applicable 179 408 179 248 not applicable
450 536 10 not applicable not applicable 179 not applicable 179 202 not applicable
500 652 12 355 592 244 408 244 296 not applicable
560 847 13 not applicable 701 not applicable not applicable 296 351 not applicable
630 1053 15 355 861 366 603 366 not applicable 526
16 421 1062 not applicable 724 443 531 634
18 517 1083 542 897 542 787
20 617 1301 651 1088 651 not applicable 955
22 759 1610 805 1321 805 1161
24 913 1964 976 1631 976 1436
27 1105 2369 not applicable 1962 1186 not applicable 1729
30 1355 2928 not applicable 2400 1464 2116
33 1625 3540 not applicable 2923 1771 not applicable 2581
36 1967 4336 not applicable 3576 2167 3154
40 2361 5259 not applicable 4331 2635 not applicable 3825
44 2854 6440 not applicable 5318 3220 not applicable 4698
49 3411 7808 not applicable 6525 3905 not applicable 5766
54 4121 9571 not applicable 7891 4786 not applicable 6975
60 4972 11707 not applicable 9648 5855 not applicable not applicable
66 5960 14166 not applicable not applicable 7084 not applicable not applicable
73 7276 17330 not applicable not applicable 8667 not applicable not applicable