AIRSTAGE VRF Technical Reference
VRF - master Indoor unit
Master Indoor Unit operation and mode selection
For applicable AIRSTAGE J-Series and V-Series reverse cycle VRF heat pump systems.
On these systems, one indoor unit is selected as the Master Indoor Unit. The Master Indoor Unit determines the operating mode for the VRF system. Mode selection must therefore be made from the controller connected to the Master Indoor Unit.
How the system works
- One indoor unit is selected to determine the system operating mode.
- To change the operating mode, use the controller for the Master Indoor Unit.
- When using a controller connected to another indoor unit, the Mode setting is locked and cannot be changed.
- Settings other than operating mode, such as temperature and fan speed, can still be adjusted independently at the individual indoor unit controllers.
Mode button locked?
This is expected when the controller is not connected to the Master Indoor Unit. To change between Auto, Cool, Dry or Heat, use the Master Indoor Unit controller.
This is expected when the controller is not connected to the Master Indoor Unit. To change between Auto, Cool, Dry or Heat, use the Master Indoor Unit controller.
Changing the operation mode
| Step | Action |
|---|---|
| 1 | Go to the controller for the Master Indoor Unit. |
| 2 | Press Mode. |
| 3 | Select the required mode: Auto, Cool, Dry or Heat. |
| 4 | The system mode will change and the other indoor units will operate within the mode available for that system condition. |
| 5 | Adjust temperature, fan speed and other permitted settings at each indoor unit controller as required. |
To change the operating mode again later, return to the Master Indoor Unit controller and repeat the process.
Mode compatibility across indoor units
| Master Indoor Unit mode | Other indoor units |
|---|---|
| Heat | Can operate in Heat or be turned Off. |
| Cool | Can operate in Cool or Dry, or be turned Off. |
| Dry | Can operate in Cool or Dry, or be turned Off. |
| Auto | The Master Indoor Unit determines whether the system operates in heating or cooling, and the other indoor units follow the resulting system mode. |
Important: The system operating mode must remain consistent, but individual indoor units can still have their own temperature, fan speed and other available settings.
Record the Master Indoor Unit
For easier future operation, record the location of the Master Indoor Unit and its controller:
| Master Indoor Unit location | |
| Controller location |
Applicable series and models
| Series | Outdoor unit / condenser models |
|---|---|
| J-II Outdoor Units | AJYA36LALH, AJYA45LALH, AJYA54LALH |
| J-IIS Outdoor Units | AJT040LCLAH, AJT045LCLAH, AJT054LCLAH |
| J-IVS Outdoor Units | AJT040LCLBH, AJT045LCLBH, AJT054LCLBH AJT040LCLCH, AJT045LCLCH, AJT054LCLCH |
| J-III Outdoor Units | AJY040LBLAH, AJY045LBLAH, AJY054LBLAH |
| J-IV Outdoor Units | AJY040LBLBH, AJY045LBLBH, AJY054LBLBH AJT040LBLCH, AJT045LBLCH, AJT054LBLCH |
| J-IIIL Condensers | AJY072LELAH, AJY090LELAH, AJY108LELAH AJY126LELAH, AJY144LELAH |
| J-IVL Condensers | AJY072LELBH, AJY090LELBH, AJY108LELBH AJY126LELBH, AJY144LELBH |
| V-II Condensers | AJYA72LALH, AJYA90LALH, AJY108LALH AJY126LALH, AJY144LALH |
| V-III Condensers | AJY072LALBH, AJY090LALBH, AJY108LALBH AJY126LALBH, AJY144LALBH |
Controller instructions
For detailed instructions on the buttons, menus and functions of the installed controller, refer to the Operation Manual supplied with the indoor unit/controller.
AIRSTAGE VRF technical reference | Reverse Cycle VRF Heat Pump Mode Control