We have installed a Fujitsu AOU48RLXFZ1 outdoor unit on the exterior wall of our house. There are 6 indoor units connected to this outdoor unit. This is in San Francisco Bay Area.
When the outdoor unit is running, it creates a significant amount of vibration and noise. Although there are vibration dampening neoprene pads under the feet (between unit feet and wall bracket), it still vibrates the whole wall when it runs on high. It is also very loud behind it. I measured about 72dB at low frequencies (~125Hz) at about 3 feet distance from the back of the unit. The compressor seems to be source of all vibration. The fan is very quiet. Condenser seems to have a high level of low frequency noise. The mix of vibration and low frequency noise is very irritating. I can hear the noise behind 3 walls in the next room.
The first question is whether this is normal. The outdoor unit is mounted on wall brackets and the space between the back of the outdoor unit and the wall is about 12 in.
When I checked the compressor inside the unit, I saw that the compressor is sitting on rubber isolation feet. However, the bolts are not tightened to press the compressor to the rubber feet. There is a 3/8-in gap between the nut/washer and the compressor feet (which sits on rubber isolation feet). Does it need to be tightened?
Another observation: The rubber feet under the compressor seems to dampen the vibration that travels through the compressor feet. However, anything that touches compressor body vibrates a lot. And the whole outdoor unit vibrates with it, includes electrical wires and copper lineset connected to the outdoor unit.
When the outdoor unit is running, it creates a significant amount of vibration and noise. Although there are vibration dampening neoprene pads under the feet (between unit feet and wall bracket), it still vibrates the whole wall when it runs on high. It is also very loud behind it. I measured about 72dB at low frequencies (~125Hz) at about 3 feet distance from the back of the unit. The compressor seems to be source of all vibration. The fan is very quiet. Condenser seems to have a high level of low frequency noise. The mix of vibration and low frequency noise is very irritating. I can hear the noise behind 3 walls in the next room.
The first question is whether this is normal. The outdoor unit is mounted on wall brackets and the space between the back of the outdoor unit and the wall is about 12 in.
When I checked the compressor inside the unit, I saw that the compressor is sitting on rubber isolation feet. However, the bolts are not tightened to press the compressor to the rubber feet. There is a 3/8-in gap between the nut/washer and the compressor feet (which sits on rubber isolation feet). Does it need to be tightened?
Another observation: The rubber feet under the compressor seems to dampen the vibration that travels through the compressor feet. However, anything that touches compressor body vibrates a lot. And the whole outdoor unit vibrates with it, includes electrical wires and copper lineset connected to the outdoor unit.