Static Pressure and Sensor Configuration for Fujitsu Ducted Units Using UTY-RNRUZ5

Applicable to Models: ARU, ADUH, ARUM, ARUH
Controller: UTY-RNRUZ5 (touchscreen wall-mounted wired remote)

Overview

Ducted indoor units require correct static pressure settings for optimal airflow and performance. This is one of the most commonly overlooked setup steps. Static pressure can be configured using several Fujitsu remote controllers (UTY-RSRY, UTY-RVRU/Kogami), but the UTY-RNRUZ5 makes this process simple and intuitive.

This guide walks you through setting static pressure and changing temperature sensing behavior using the UTY-RNRUZ5 controller.

1. Power Down and Connect the Thermostat

• Disconnect power to the indoor unit.

• Connect the UTY-RNRUZ5 to terminals Y1 and Y2.

• Restore power to the system.

• The thermostat will display “Please Wait” with a spinning icon as it boots up.

2. Initial Setup

• After boot-up, you'll be prompted to set date and time (optional—you can skip and do it later).

• Select Residential or Commercial use. This impacts available menu options (e.g., password management).

• Choose your preferred temperature unit (Fahrenheit is most common in the U.S.).

3. Entering the Maintenance Menu

• Once at the main screen, press the Menu button.

• Navigate to the next page, then select Maintenance.

• Choose Function Setting.
  When prompted for a password, enter the default: 0000.

4. Setting Static Pressure – Function Code 26

• Use the up/down arrows to scroll to Function 26.

• This function sets the static pressure level, informing the indoor unit of duct and filter resistance.

• Use your duct design specs and filter pressure drop to choose the correct setting.

Example Settings (Function 26 values may vary by model):

• 00 = Low Static (~0.12 in. WC)

• 01 = Medium Static (~0.36 in. WC)

• 02 = High Static (~0.60 in. WC)

Refer to the installation manual or engineering data for exact values.

• Once the correct value is selected, press Setting, choose your value, then press Change to confirm.

5. Optional: Configure Thermostat as Temperature Sensor

By default, the indoor unit uses its return air sensor for temperature readings. If you'd like to use the wall-mounted thermostat as the sensor or combine both, configure the following:

Function 42 – Sensor Mode

• Navigate to Function 42, press Setting.

• Change value from 00 (default) to:

  • 01 – Averages thermostat and return air sensor.

Function 48 – Thermostat-Only Sensing

• Navigate to Function 48, press Setting.

• Change value from 00 (default) to:

  • 01 – Thermostat only (disables return air sensor).

If using the thermostat as the only sensing device, set both Function 42 and 48 appropriately.

6. Save Settings – Power Cycle the Unit

After making changes:

• Turn off power to the unit at the disconnect or breaker.

• Wait at least 60 seconds.

• Restore power.
  The system will now operate using the new configuration.

7. Enable Thermostat Sensor Display

To confirm the thermostat is sensing room temperature:

• From the main screen, press Menu, navigate to Initial Settings.

• Select R.C. Sensor Setting and change to Used.

• A thermostat icon will now appear at the bottom of the screen, indicating it’s being used as a temperature sensor.

Optional: Show Room Temp on Display

• Go to Display Item Setting (also under Initial Settings).

• Enable the option to show current room temperature on the main screen.

Conclusion

Your static pressure and sensor settings are now complete. These steps ensure proper airflow and accurate temperature control, reducing callbacks and improving system performance. Always refer to the indoor unit’s service manual for recommended pressure values and further customization.