OPTIONAL POWER EXHAUST/BAROMETRIC RELIEF DAMPER RAIN HOOD
The instructions for the power exhaust/barometric relief damper rain hood can be found in the kit. The exhaust fan, all supporting brackets, angles, and the wiring are factory installed as part of the power exhaust option.
OPTIONAL ECONOMIZER AND POWER EXHAUST DAMPER SET POINT ADJUSTMENTS AND INFORMA- TION
Remove the economizer access panel from the unit. Loosen but do not remove the two panel latches. Locate the economizer control module, where the fol- lowing adjustments will be made.
EXTREME CARE MUST BE EXCERCISED IN TURNING ALL SETPOINT, MAXIMIUM, AND MINIMUM DAMPER POSITIONING ADJUST- MENT SCREWS TO PREVENT TWISTING THEM OFF.
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 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 set point may now be set by selecting the desired setpoint shown in the Enthalpy Setpoint Adjust- ment Figure 9. 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 Figure 9.
•For a dual enthalpy operation, carefully turn the set point adjusting screw fully clockwise past the "D" setting.
POWER EXHAUST DAMPER SETPOINT
With power exhaust option, each building pressuriza- tion requirement will be different. The point at which the power exhaust comes on is determined by the econo- mizer 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.
•For a dual enthalpy operation, carefully turn the set point adjusting screw fully clockwise past the "D" setting.
INDOOR AIR QUALITY AQ
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.
OPTIONAL
Remove the economizer access panel from the unit. Loosen, but do not remove the two panel latches. Locate the economizer actuator, where the following adjustment can be made.
With power exhaust option, each building pressuriza- tion requirement will be different. The point at which the power exhaust comes on is determined by the econo- mizer's outdoor damper position. The actuator's auxil- iary switch adjustment screw should be set at the damper position at which the power exhaust is needed. The adjustment screw can be set between 25 to 85 degrees open.
Replace the economizer access panel.
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