| How it Works
The 75F Outside Air Optimization (OAO) kit includes a 75F economizer controller, CO2 sensor, Mixed Air Temperature (MAT) sensor, two 10K thermistors for SAT and OAT, and cloud computing software with predictive analytics that provide optimum positioning of the outside air damper on package HVAC units throughout the year using demand controlled ventilation (DCV) and differential enthalpy. Economizer logic is enhanced by predictive analytics to yield increased energy savings and comfort.
Disconnect power. 18AWG T-stat wire is recommended. Follow the wiring diagram above to wire the controller, economizer actuator, CO2 sensor, MAT sensor, OAT, and RAT sensors.
Powering the Controller. To power the controller, use 18/2AWG run from the 24VAC transformer using the same polarity as any of the other devices connected to that transformer.
Wiring the CO2 Sensor. Using 18/3AWG run from the CO2 Mounting location to the 75F OAO controller and wire according to the wiring diagram in Fig.6.
Placement of the MAT Thermistor. Connect the stripped wire of the thermistor to the controller as shown in Fig.6 Using the provided bracket, mount the MAT sensor near the intake of the blower.
Wiring the Actuator. Use 18/3AWG T-stat wire to connect the 75F controller to the actuator motor. Connect the terminals for Power, Ground, and Signal (+), Fig.7.
Pair the Smart Node to a zone that has been preconfigured or create and configure a zone yourself through Setup > Floor Plan on the CCU.
Once power is supplied to the system and all Smart Nodes are displaying the default room.
- Disconnect the tablet from the CM and carry it with. Pairing will be performed using Bluetooth.
- Press the right button on the Smart Node OAO until you reach advertising mode.
On the tablet choose the OAO Zone under System Devices and press “Pair Module.” Pairing process will start.
Follow the pairing steps on the Smart Node and press Pair.
The tablet will request a PIN. Enter the PIN displayed on the Smart Node OAO in the zone you are pairing.
- Pairing process will take a few more seconds and then complete displaying “Success” on the screen. After a few more seconds the Smart Node will display the new zone name. The tablet will not display any zone data until it is reconnected to the CM where it will communicate over a 900Mhz channel.
| CONFIGURATION / CONFIRMATION
Once paired, ensure that the sensors are reading accurately. To do this go to the Central Control Unit (CCU) or the 75F installer app on iPhone or Android device.
Test the OAO actuator. To do this from the CCU (can also be done from the 75F Installer app) go to Setup > Settings > Damper Testing. Run the damper to 100% open. Verify at the actuator that the outside damper is 100% open. **It may take up to 90 seconds from the time you make the change for the damper to move. Run the actuator to 50% and ensure the outside damper closes to 50% open. If the damper fails to meet one or both tests, you may need to readjust the damper arm positions.
To test the actuator from the Smart Node, press the right button twice to reach the “Outputs” page. Go down to Analog 1. Press the right to highlight the output voltage. From here, you can force the output to the desired signal. Response should be immediate.