Greenheck AMD-xx-TD Series Dampers (478799 IOM). - Manual (Page 4)

4
AMD-xx-TD’s Ordered with a Factory Supplied Controller
When you order a factory supplied controller, it comes with a Greenheck exclusive VAFB24-BAC-GTD actuator
which has the controller integrated inside of it. The actuator/controller is configured by the factory at the time
the unit is ordered for either analog or BACnet operation. This selection is made by setting the Setpoint Source
datapoint to Local AI or BACnet. A complete list of the all the BACnet datapoints is listed in Table 1 (page 7).
AMD-xx-TD Series Dampers with an Analog Factory Supplied Controller
Figure 2 shows field wiring for an AMD-xx-TD ordered with a factory supplied controller configured for analog
operation.
Units ordered without a factory supplied controller
are supplied with a standard modulating actuator.
The Vari-Green transmitter and actuator are wired to
a factory supplied terminal block. Figure 1 shows the
field wiring side of the terminal block.
AMD-xx-TD Series Dampers without a Factory Supplied Controller
The 0-10 VDC analog output at terminals 3 and
4 comes from the Vari-Green transmitter and is
proportional to the velocity going through the
AMD-xx-TD. A 10 VDC signal represents the
maximum velocity that was selected at the time the
unit was ordered. The selected maximum velocity
and the area of the AMD-xx-TD are listed on a label
adjacent to the terminal block. An example of how
you can determine the velocity and/or cfm going
through the unit is shown below.
Example 1: Determine the CFM from a 24 in.
x 24 in. AMD-xx-TD (area of 4 ft 2 ) with a selected
maximum velocity of 2,000 fpm and a voltage reading
across terminals 3 and 4 of 3.5 VDC.
1 2 3 4 5 6 9 7 8
S
S
~



24VAC
0-10VDC Output
Proportional to
Flow
Control
Signal to
Actuator
AMD-XX-TD w/o Factory
Supplied Controller
Factory Installed
Terminal Block
On multiple section high dampers, the
actuators on the sections without the
terminal block will need to be field wired
into Terminals 1, 2, & 5
*** ***
1 2 3 4 5 6 9 7 8
S
S
~
 

24VAC
Factory Installed
Terminal Block
0-10 VDC Output
Proportional to
Flow
0-10VDC
Input
Setpoint
AMD-XX-TD w/Analog
Factory Supplied
Controller
Figure 1
Figure 2
Measured Velocity = Max Velocity * (Measured Voltage / 10)
Measured Velocity = 2,000 * (3.5 / 10)
Measured Velocity = 700 fpm
and
Measured CFM = Measured Velocity * Area
Measured CFM = 700 fpm * 4 ft2
Measured CFM = 2,800 cfm