826081-XIM-C-0214
Johnson Controls Unitary Products
15
Optional Economizer And Power Exhaust Damper Set
Point Adjustments And Information
Remove the economizer access panel from the unit. Loosen
but do not remove the two panel latches. Locate the
economizer control module, where the following adjustments
will be made.
Check that the damper blades move smoothly without binding;
carefully turn the Minimum Position Adjusting screw (found on
the damper control module) fully clockwise and then set the
thermostat indoor fan switch to the on position and then off, or
energize and de-energize terminals “R” to “G”.
Minimum Position Adjustment
With thermostat set to indoor fan on position, or terminals “R” to
“G” energized, turn the Minimum Position Adjusting screw
(located on the damper control module) counterclockwise until
the desired minimum damper position has been attained.
Enthalpy Set Point Adjustment
The enthalpy set point may now be set by selecting the desired
setpoint shown in the Enthalpy Setpoint Adjustment 7. Adjust
as follows:
• For a single enthalpy operation carefully turn the set point
adjusting screw (found on the damper control module) to
the “A”, “B”, “C” or “D” setting corresponding to the
lettered curve of the Enthalpy Setpoint Adjustment 7.
• For a dual enthalpy operation, carefully turn the set point
adjusting screw fully clockwise past the “D” setting.
Power Exhaust Damper Setpoint (With Or Without Power
Exhaust)
• With no power exhaust option, adjust the Exhaust Air
Adjustment Screw fully clockwise.
• With power exhaust option, each building pressurization
requirement will be different. The point at which the power
exhaust comes on is determined by the economizer
damper position (Percent Open). The Exhaust Air
Adjustment Screw should be set at the Percent Open of
the economizer damper at which the power exhaust is
needed. It can be set from 0 to 100% damper open.
Indoor Air Quality
Indoor Air quality (indoor sensor input): Terminal AQ accepts a
+2 to +10 Vdc signal with respect to the (AQ1) terminal. When
the signal is below it's setpoint, the actuator is allowed to
modulate normally in accordance with the enthalpy and mixed
air sensor inputs. When the AQ signal exceeds it's setpoint
setting and there is no call for free cooling, the actuator is
proportionately modulated from the 2 to 10 Vdc signal, with 2
Vdc corresponding to full closed and 10 Vdc corresponding to
full open. When there is no call for free cooling, the damper
position is limited by the IAQ Max damper position setting.
When the signal exceeds it's setpoint (Demand Control
Ventilation Setpoint) setting and there is a call for free cooling,
the actuator modulates from the minimum position to the full
open position based on the highest call from either the mixed
air sensor input or the AQ voltage input.
• Optional CO
2
Space Sensor Kit Part # 2AQ04700324
• Optional CO
2
Unit Sensor Kit Part # 2AQ04700424
Replace the economizer access panel.
Extreme care must be exercised in turning all
setpoint, maximum, and minimum damper posi-
tioning adjustment screws to prevent twisting
them off.
