AIRSTAGE VRF Technical Reference
Low Noise Mode
Outdoor unit noise reduction, operating priorities and configuration
For supported Fujitsu General AIRSTAGE VRF systems
Overview: Low Noise Mode reduces outdoor unit sound levels during selected operating periods. It is intended for nighttime operation and installations in residential, urban or other noise-sensitive environments.
Important: Low Noise Mode may reduce available system capacity. Configuration must be completed by appropriately qualified personnel using the applicable outdoor unit service documentation.
1. Features of Low Noise Mode
| Feature | Details |
|---|---|
| Automatic noise reduction | Uses optical sensors to monitor environmental conditions and automatically adjust outdoor unit operation for reduced noise. Both operational-priority and noise-priority settings are supported. |
| Selectable reduction levels | Level 1: -3 dB Level 2: -5 dB |
| Nighttime optimisation | Designed to reduce outdoor unit sound levels during nighttime operation and minimise disturbance. |
| Selectable operating priorities | Quiet Priority Mode: Prioritises lower sound levels with a possible reduction in performance. Capacity Priority Mode: Balances sound reduction with maintaining higher operating performance. |
2. Typical use cases
Residential areas
Helps reduce nighttime disturbance and supports installations where lower outdoor sound levels are required.
Helps reduce nighttime disturbance and supports installations where lower outdoor sound levels are required.
Urban environments
Suitable for densely populated areas, sites surrounded by buildings or locations close to roads.
Suitable for densely populated areas, sites surrounded by buildings or locations close to roads.
Noise-sensitive zones
Applicable to sites such as schools, hospitals, offices and other locations where reduced sound levels are beneficial.
Applicable to sites such as schools, hospitals, offices and other locations where reduced sound levels are beneficial.
3. Configuration
- Access the outdoor unit PCB settings.
Locate the outdoor unit printed circuit board and identify the applicable function or DIP switch settings. - Select the required noise reduction level using Mode No. 42.
Setting Result 00 Level 1: -3 dB 01 Level 2: -5 dB - Select the required operation pattern using Mode No. 40.
Setting Result 00 Quiet Priority Mode 01 Capacity Priority Mode - Confirm and activate the settings.
Save the selected settings in accordance with the applicable outdoor unit service procedure.
Model verification required: Function numbers and available settings can vary by product series. Confirm compatibility and the correct configuration procedure in the service manual for the installed outdoor unit before making changes.
4. Reference image
