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You are here: Using The System > AHU > AHU First-time Setup > 3. Channel Setup: Inputs

Configure Analogue Inputs

  1. Auto Discover WEMScontroller3.
  2. Run Channel Setup Wizard To Configure Analogue Outputs.
  3. Run AHU Discover Wizard.
  4. Configure AHU Control Points.
  5. Assign A Schedule To The AHU.

This guide covers the first-time setup of an AHU, and assumes that a WEMScontroller3 has already been through Auto Discover and had its analogue outputs set up.

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  1. Select the channel type as Analogue Input in order to configure the inputs.

Any analogue inputs could be used at this point, i.e. it's not essential to use the analogue inputs of the WEMScontroller3; however, as the device has 2 spare analogue inputs, it's easiest to use them for this purpose.

  1. Select Multifunction Sensor 1, and then click Next.

  1. Select Temperature Sensor, and then click Next.

  1. Choose the properties for the channel, and then click Next.

ClosedView/hide channel property definitions

  • Desired Range: Only applicable when reading a 0–10 voltage in the analogue input. This is the maximum value of the unit being measured or what the reading will be at 10 volts. Example: for a CO2 sensor that reads 0–2000 ppm (parts per million), the desired range would be set to 2000. The unit depends on what is being measured.
  • Desired Offset: Only applicable when reading a 0–10 voltage in the analogue input. This is the minimum value of the unit being measured or what the reading will be at 0 volts. Usually set to 0 unless the lowest reading is not 0. The unit depends on what is being measured
  • Desired Sample Rate: The number of seconds between each read of the analogue value being measured (temperature, light etc.).
  • Desired Average Value: The number of analogue reads over which the average is calculated. Example: a temperature sensor will read every 5 seconds and then after 30 readings it will display the average temperature of those 1–30 readings. When the next sample read comes in (reading 31) it will then average readings 2–31 so it becomes a rolling average. These average values are not visible in the system. The calculations and data are kept locally on the device PCB.

  1. Set the Object type to Supply Air Temp, and then click Next.

  1. Choose a location, and then click Next.

  1. Click Next to the confirmation message.

  1. Click Next to begin configuring the next channel.

  1. Set the channel type to Analogue Input.
  2. Select Multifunction Sensor 2, and then click Next.

  1. Select Temperature Sensor, and then click Next.

  1. Choose the properties for the channel, and then click Next.

ClosedView/hide channel property definitions

  • Desired Range: Only applicable when reading a 0–10 voltage in the analogue input. This is the maximum value of the unit being measured or what the reading will be at 10 volts. Example: for a CO2 sensor that reads 0–2000 ppm (parts per million), the desired range would be set to 2000. The unit depends on what is being measured.
  • Desired Offset: Only applicable when reading a 0–10 voltage in the analogue input. This is the minimum value of the unit being measured or what the reading will be at 0 volts. Usually set to 0 unless the lowest reading is not 0. The unit depends on what is being measured
  • Desired Sample Rate: The number of seconds between each read of the analogue value being measured (temperature, light etc.).
  • Desired Average Value: The number of analogue reads over which the average is calculated. Example: a temperature sensor will read every 5 seconds and then after 30 readings it will display the average temperature of those 1–30 readings. When the next sample read comes in (reading 31) it will then average readings 2–31 so it becomes a rolling average. These average values are not visible in the system. The calculations and data are kept locally on the device PCB.

  1. Set the Object type to Return Air Temp, and then click Next.

  1. Choose a location, and then click Next.

  1. Click Next to the confirmation message.

  1. Click Finish to exit the wizard.

The Channel Setup Wizard is now complete and control is returned to the Floorplan.

In order for the AHU to function, the system will need to be configured with an Outside Air Temp sensor. A wireless outside air sensor is required for this role (e.g. the ASD09N4O or ASD09N4OL), which can be discovered and configured via the usual Auto Discover wizard.

Before moving on to run the AHU Discover Wizard, it's recommended to hide the extraneous new icons that will have appeared on the Floorplan. If this is not immediately apparent, exiting and re-entering the user interface will cause the Floorplan to refresh and display the new icons. To remove the extraneous icons, do the following:

Go to Edit | SMARTobject Visibility, and hide all AHU-related items except for Return Air Temp, as this is the only value that is likely to be of interest once the AHU is operational. Hide the following items by clicking on them to set their value to false:

Next Step

The Auto Discover and Channel Setup of the WEMScontroller3 is now complete.

The next step is to Run The AHU Discover Wizard.

WEMS User Guide version 4.0 20150130.
This guide relates to features up to and including 1.18.0.3