SECTION 3.0: Installation
3.1 INSPECTION
Carefully remove the Vari-Green probe(s) or station and transmitter from the shipping container and inspect for any
damage.
IMPORTANT: All Vari-Green transmitters are factory configured with the application specific duct size
and flow rate information. The transmitter and probes or flow station are tagged with matching ESID and/
or customer specific identification. Matching the systems as configured by the factory will reduce the
installation and start-up labor required.
Review the Factory Set-Up Information Sheet provided separately and verify that the W.O. # and serial # match
those on the Vari-Green
system.
Verify that the configuration recorded on the Factory Set-Up Information Sheet is
correct for your application. If any damage has occurred in transit or the factory set-up configuration is incorrect for
your application, please contact Greenheck at 1-800-717-6540.
3.2 INSTALLATION LOCATION GUIDELINES
The standard version of the Vari-Green transmitter and probe connection heads have a NEMA 1 enclosure rating
suitable for clean and dry indoor locations. For additional protection, an enclosure with an adequate NEMA rating
may be required.
The ambient temperature of the selected mounting location must be between -20°F and 140°F. Consideration should
be given to units exposed to direct sunlight.
The selected mounting location should be rigid and free of vibration.
3.3 TRANSMITTER PLACEMENT AND MOUNTING
For placement of transmitter, see instruction manual at www.greenheck.com, 478799 AMD-XX-TD IOM.
3.4 POWER and SIGNAL CONNECTIONS
NOTE:
The Vari-Green transmitter terminal connections for power and signal wire are labeled on the board for
installation convenience. Power wiring is located at terminal strip J4. Signal wiring is located at terminal strip J1.
The REMOVABLE* terminal strips for power and signal are located in the lower portion of the transmitter and are
accessible by opening the hinged cover. (See figure
below
for the exact location of the terminal strips.) Two conduit
openings are provided in the bottom of the transmitter enclosure; one for power and one for signal wiring.
Recommended wire gauge (14 AWG is the maximum wire gauge - no more than two wires recommended per
terminal):
Power wire = 14 AWG to 18 AWG
Signal wire = 14 AWG to 22 AWG
* To aid in the wiring of both power and signal wires, J1 and J4 are removable by pulling the terminal strip straight
up and off the circuit board. Once wiring has been completed, replace the terminal strip by aligning it with the
receptacle and inserting firmly.
WARNING: The Vari-Green transmitter is a low voltage device (24V AC/DC). Connecting the transmitter to
high voltage power (e.g. 110 VAC) may cause damage and will void the warranty.
Power Connections:
Terminal J4, pin 1 for Line, pin 2 for Neutral and pin 3 for Ground. See figure below for details.
The Vari-Green can be powered by either 24VAC providing 20-28VAC or 24VDC providing 20-40VDC.
CAUTION: The earth ground is required on all Vari-Green transmitter installations. Omitting the connection to
earth ground could result in poor performance and may void the warranty.
Analog Outputs:
Terminal J1; AO1 pins 1 and 2; AO2 pins 3 and 4. Pins 2 and 4 are for the common wire of the
respective output. See figure below for details.
Vari-Green® Transmitter
4
®
