) Purpose

This article explains how to change indoor unit “Function Settings” using the UTY-RNRT wired remote controller, and provides a reference list of the available function numbers and setting values for ARTH45/54/60KHTA ducted indoor units. Incorrect settings can cause malfunction; apply settings strictly to site conditions.

Installation Manual - UTY-RNRT

Installation Manual - ARTH 45 5…

2) Prerequisites / access

  • Installer password may be required for installer-level menus; default = 0000.


  • Confirm the indoor unit model is ARTH45/54/60KHTA.

  • Identify whether you are setting one indoor unit address or All units.

3) Procedure – Change Function Settings (UTY-RNRT)

  1. From the Monitor Mode screen, open Menu, then navigate to Maintenance.

  2. Select Function Setting (Maintenance → Function Setting).

  3. On the Function Setting screen, touch Address.

  4. Use ▲/▼ to select the indoor unit address to configure (or select “All” to apply to all connected indoor units), then touch OK.

  5. Touch Function No., set the required Function Number with ▲/▼, then touch OK.

  6. Touch Setting No., set the required Setting Value with ▲/▼, then touch OK.

  7. Touch Setting to write the selected Function No. / Setting No. to the selected address(es).

  8. Touch Back to return to the Maintenance screen.

  9. After completing Function Setting, power-cycle the system (OFF → ON).

4) Function Setting Reference – ARTH45/54/60KHTA

4.1 Filter sign

Function 11 – Filter sign interval (default: 03 No indication)

  • 00 = Standard (2500 hours)

  • 01 = Long interval (4400 hours)

  • 02 = Short interval (1250 hours)

  • 03 = No indication (factory setting)

4.2 Room temperature correction (sensor offsets)

These settings apply a correction value relative to the standard setting.

Installation Manual - ARTH 45 5…

Function 30 (Cooling) / 31 (Heating) – Indoor unit sensor correction (default: 00 Standard setting)

  • 00 = Standard setting (factory setting)

  • 01 = 0.0°C

  • 02 = −0.5°C … up to 09 = −4.0°C (More cooling / Less heating)

  • 10 = +0.5°C … up to 17 = +4.0°C (Less cooling / More heating)

Function 35 (Cooling) / 36 (Heating) – Wired controller sensor correction (default: 00 No correction)

  • 00 = No correction (factory setting)

  • 01 = 0.0°C

  • 02 = −0.5°C … 09 = −4.0°C

  • 10 = +0.5°C … 17 = +4.0°C

Note: For wired-controller sensor control, Function 42 must be set to 01 (Both), and the Thermo Sensor icon must be displayed on the controller.

4.3 Static pressure (duct ESP)

Function 26 – Static pressure (default: 31 Standard 60 Pa)

Manual setting (ESP selection):

  • Setting values 06–26 map to 60–260 Pa in 10 Pa increments:

    • 06=60 Pa, 07=70 Pa, …, 26=260 Pa

  • Range of static pressure: 60 to 260 Pa

  • 31 = Standard 60 Pa (factory setting)

  • 32 = Automatic airflow adjustment

Automatic airflow adjustment (Setting 32) – key points:

  • Not usable if there is a booster fan between ducts; ensure ESP is within allowable range.

  • Process summary: set Function 26 to 32, run Fan mode (High), unit runs then stops automatically, then power-cycle, and record the obtained setting value.

4.4 Restart behaviour

Function 40 – Auto restart after power interruption (default: 00 Enable)

  • 00 = Enable (factory setting)

  • 01 = Disable

4.5 Sensor switching (which sensor is active)

Function 42 – Room temperature sensor switching (default: 00 Indoor unit)

  • 00 = Indoor unit (factory setting)

  • 01 = Both

Function 48 – Room temperature sensor switching (Aux.) (default: 01 Wired remote controller)

  • 00 = Both

  • 01 = Wired remote controller (factory setting)

This only works if Function 42 is set to 01 (Both).

4.6 Heating comfort protection

Function 43 – Cold air prevention (default: 00 Enable)

  • 00 = Enable (factory setting)

  • 01 = Disable

4.7 External input control mode

Function 46 – External input control (default: 00 Operation/Stop mode 1)

  • 00 = Operation/Stop mode 1 (factory setting)

  • 01 = (Setting prohibited)

  • 02 = Forced stop mode

  • 03 = Operation/Stop mode 2

4.8 Cooling energy-saving fan control

Function 49 – Indoor unit fan control for energy saving (cooling) (default: 02 Remote controller)

  • 00 = Disable

  • 01 = Enable

  • 02 = Remote controller (factory setting)
    (00 = continuous fan when OD is stopped; 01 = intermittent very low speed; 02 = controlled via remote controller if supported.)

4.9 External output terminal function

Function 60 – External output terminal function (default: 00 Operation status)

  • 00 = Operation status (factory setting)

  • 09 = Error status

  • 10 = Fresh air control

  • 11 = Auxiliary heater

4.10 Auto mode behaviour

Function 68 – Auto mode type (default: 00 Single setpoint)

  • 00 = Single setpoint auto mode (factory setting)

  • 01 = Dual setpoint auto mode

Function 69 – Deadband value (dual setpoint only) (default: 00 = 0°C)

  • 00 = 0°C (factory setting)

  • 01 = 0.5°C, 02 = 1.0°C, …, 09 = 4.5°C