Greenheck IAQ-42 (467954) - Manual (Page 4)

4
Basic Setup
1. Locate the serial number label on both the damper and control box. Make sure that the control box and
damper with the same serial number are wired together. Mount the control box higher than the damper to
avoid condensation from running back into the pressure transducer.
2. Wire the actuator terminals to the control box terminal strip as shown in figure 1.
• Wire the actuator power, actuator terminals 1 and 2, to the control box terminals labeled 1 and 2
respectively.
• Wire the actuator position command, actuator terminal 3, to the control box terminal labeled 3.
• Wire the actuator position feedback, actuator terminal 5, to the control box terminal labeled 8.
3. Wire the temperature sensor, located in the 4 x 2 J-box mounted on the damper sleeve, to the control box
terminals labeled 9 and 10 as shown in figure 1.
4. Plumb the air pressure pickups from the damper to the control box as shown in figure 1. Make sure that the
air pressure pickup fitting labeled “High Pressure” is plumbed back to the control box fitting labeled “High
Pressure”. Likewise, the air pressure pickup fitting labeled “Low Pressure” should be plumbed back to the
control box fitting labeled “Low Pressure”.
5. Wire the airflow setpoint command (+) to control box terminal 6 and the airflow setpoint command ground (-)
to control box terminal 7. Note: The control signal source must have an impedance of less than 2,000 ohms.
Note: Step 6 is only applicable if it necessary to override the normal airflow control mode and put the damper
into position control mode.
6. Wire a dry contact closure that will determine the mode of operation that the damper is in across control
box terminals labeled 11 and 12. (If this circuit is open the damper will be in airflow control mode. If the
circuit is closed the damper will be in position control mode.)
Airflow Control Mode (Normal Operation)
The damper will be in airflow control mode when there is an open circuit between control box terminals 11 and
12. In this mode of operation the damper will modulate open and closed based on the 0-10 Vdc flow setpoint
signal sent to control box terminals 6 and 7. The 0-10 Vdc flow setpoint will linearly modulate the airflow rate
going through the damper between 0 and 2,000 fpm. The correct flow setpoint signal can be calculated based
on the following formula:
C = Q / (200*A)
Where:
Q= Desired Airflow (cfm)
C= Flow Setpoint (Vdc)
A= Face Area of the damper (ft2)
Example: the building desires 6,000 cfm through a 24”x24” IAQ-42
A= (24*24)/144 = 4 ft2
C=6,000 / (200 * 4) =7.5 Vdc
Setup and Operation for IAQ-42's With Factory Supplied Controller