Enabling Wired Controller Temperature Sensing and Display Room Temperature

UTY-RNRUZ5 Wired Remote Controller

 

Purpose

This procedure configures the UTY-RNRUZ5 wired remote controller to use its internal temperature sensor and display room temperature by setting Function Code 42 and Function Code 48 appropriately, followed by a system restart.

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Key Concept (Bot Explanation Friendly)

• Function Code 42 determines which temperature sensor is active

• Function Code 48 determines how sensors are combined or selected

• Without these settings, the system will default to the return air thermistor only

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Preconditions

Before proceeding, confirm:

• UTY-RNRUZ5 wired controller is installed and communicating

• Installer or administrator access is available

• Indoor unit addressing is complete

• System is powered and not in fault

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Step 1: Access Function Settings

1. From the Monitor Screen, touch Menu

2. Navigate to Maintenance

3. Enter the Installer Password

4. Select Function Setting

5. Choose the correct Indoor Unit Address if prompted

This menu allows configuration of indoor unit behavior parameters

Uty-RNRUZ5 Manual

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Step 2: Set Function Code 42 — Enable Wired Controller Sensor

1. Locate Function Code 42

2. Set the value to 01

3. Confirm the setting

What Function Code 42 Does

• 01 = Enables the temperature sensor inside the wired controller

• If Function 42 is not enabled, the system will:

  • Ignore the wired controller sensor

  • Use only the indoor unit return air thermistor for temperature sensing

This step is required anytime the wired controller is expected to sense room temperature.

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Step 3: Set Function Code 48 — Select Sensor Source Logic

1. Locate Function Code 48

2. Set the value to 01

3. Confirm the setting

What Function Code 48 Does

Function Code 48 determines which sensor source is used for control logic.

• 01 = Use the wired controller thermostat only

• Other values (model/system dependent) may allow:

  • Averaging between return air and thermostat

  • Priority selection logic

For applications where room-level accuracy is required, setting 01 ensures control is based strictly on the thermostat location, not the return air temperature.

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Step 4: Restart the System

After setting both function codes:

1. Exit all menus

2. Restart the system by:

   • Cycling power to the indoor unit

   • Or performing system initialization per site procedure

A restart is mandatory for function code changes to take effect.

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Step 5: Verify Operation

After restart:

1. Return to the Monitor Screen

2. Confirm Room Temperature is displayed

3. Verify the reading is reasonable for the space

If room temperature does not appear:

• Recheck Function Codes 42 and 48

• Confirm R.C. Sensor is enabled

• Confirm no central controller restrictions are present

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Quick Bot Summary

• Function 42 = Enables wired controller temperature sensor

• Without Function 42, system uses return air thermistor only

• Function 48 = Selects which sensor controls operation

• 48 = 01 means thermostat only

• System restart is required

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Field Application Note

Using 48 = 01 is recommended when:

• The return sensor is influenced by duct temperature

• The controller is mounted in the true occupied space

• Comfort complaints exist due to return air bias