Overview
In certain installations, outdoor units may exhibit vibration that is not necessarily indicative of a fault. This can be a normal characteristic of the unit’s design and the surrounding installation conditions. Every installation environment is unique, and multiple factors can influence vibration and noise levels.
Contributing Factors
The following elements can significantly affect the perceived vibration or noise output:
Mounting configuration – the type and rigidity of the surface the unit is installed on.
Building materials – structures with lightweight framing or metal cladding may transmit vibration more readily.
Refrigerant pipework – excessive tension, unsupported spans, or incorrect routing can amplify vibration.
Pipe length and layout – longer runs or tight bends may alter vibration transmission paths.
Environmental and site conditions – including resonance through walls, decks, or roof spaces.
Recommended Action
If vibration is present at the outdoor unit, mounting isolation is recommended to minimise transfer into the building structure. Suitable vibration isolation mounts should be installed beneath the outdoor unit.
Approved Isolation Mounts
The following Embleton rubber feet are recommended for use with Fujitsu General outdoor units:
| Part Number | Description | Rating | Typical Application |
|---|---|---|---|
| TV414-33 | NR1 – Blue Single Deflection | 17 kg | Light domestic units |
| TV412-34 | NRD1 – Blue Double Deflection | 17 kg | Enhanced isolation where required |
| TV412-02 | NR1 – White Single Deflection | 25 kg | Ducted and small VRF units |
| TV412-03 | NR1 – Red Single Deflection | 40 kg | Compressor side of ducted and small VRF units |
Note: It is recommended to use the white and red mounts for ducted and smaller VRF systems. The red mount should be positioned on the compressor side of the unit to provide additional load-bearing capacity and vibration control.
Summary
Vibration in outdoor units is often installation-related and can typically be mitigated through the correct use of isolation mounts and careful attention to site conditions. Ensuring proper mounting practices will maintain system performance and customer satisfaction without unnecessary component replacement.