MINIMUM POSITION ADJUSTMENT
With thermostat set to indoor fan on position, or termi- nals “R” to “G” energized, turn the Minimum Position Adjusting screw (located on the damper control mod- ule) counterclockwise until the desired minimum damper position has been attained.
ENTHALPY SET POINT ADJUSTMENT
The enthalpy setpoint may now be set by selecting the desired setpoint shown in the Enthalpy Setpoint Adjust- ment Figure 4. Adjust as follows:
•For a single enthalpy operation carefully turn the setpoint 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 Figure 4.
•For a dual enthalpy operation, carefully turn the setpoint adjusting screw fully clockwise past the “D” setting.
POWER EXHAUST DAMPER SETPOINT (WITH OR WITH- OUT POWER EXHAUST)
•With no power exhaust option, adjust the Exhaust Air Adjustment Screw fully clockwise.
•With power exhaust option, each building pressur- ization 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 accor- dance 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 propor- tionately modulated from the 2 to 10 Vdc signal, with 2 Vdc corresponding to full closed and 10 Vdc corre- sponding 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 modu- lates from the minimum position to the full open posi- tion based on the highest call from either the mixed air sensor input or the AQ voltage input.
•Optional CO2 Space Sensor Kit Part # 2AQ04700324
•Optional CO2 Unit Sensor Kit Part # 2AQ04700424 Replace the economizer access panel.
12 | Johnson Controls Unitary Products |
