vaderle
2021-02-01 15:16:14
- #1
Hello everyone,
we moved into our house in the summer (150m² townhouse made of 16cm aerated concrete prefabricated parts + ETICS insulation). For hot water generation (heating + domestic water) we have an air-to-water heat pump from Vaillant. It is the VWL 55/5 AS 230V S2 with outdoor and indoor units. Outside, the fan with the compressor is located.
On cold days - when the system runs more frequently - we have now noticed that we can hear the system (when the compressor is running) in all rooms (a humming). It makes no difference whether I open or close doors/windows. Therefore, I assume that this humming is transmitted through the walls (structure-borne sound). In the utility room (where the indoor unit is located) and outside, I have noticed the strongest vibrations in the pipes of the cooling circuit. All other components apparently generate hardly any vibrations. When you touch these pipes, you can feel the vibration. When the fluid is not flowing or the compressor is not running, of course you don’t feel anything. Then it is quiet in the house.
The outdoor unit is mounted on the facade (see photos). It stands on dampers. The mentioned pipes run from inside through the house wall to the outside (see photos). I noticed that the holes where the pipes were pulled through were simply closed with concrete (see photos). I see no special channel to prevent contact between pipe and concrete. Therefore, I assume that the vibrations from the pipe are transmitted directly to the wall.
Would you also consider this the cause?
Finding a solution: I was thinking about placing the indoor unit on a mat and additionally wrapping the already white-insulated coolant pipes (see photos) with soundproofing material. Do you think that would help? Or is the core of the problem the passage from inside to outside? I also thought about whether placing the outdoor unit on a concrete base would help. But as long as these white pipes have direct contact with the concrete elements, the problem will remain.
How do your coolant hoses run from inside to outside?
we moved into our house in the summer (150m² townhouse made of 16cm aerated concrete prefabricated parts + ETICS insulation). For hot water generation (heating + domestic water) we have an air-to-water heat pump from Vaillant. It is the VWL 55/5 AS 230V S2 with outdoor and indoor units. Outside, the fan with the compressor is located.
On cold days - when the system runs more frequently - we have now noticed that we can hear the system (when the compressor is running) in all rooms (a humming). It makes no difference whether I open or close doors/windows. Therefore, I assume that this humming is transmitted through the walls (structure-borne sound). In the utility room (where the indoor unit is located) and outside, I have noticed the strongest vibrations in the pipes of the cooling circuit. All other components apparently generate hardly any vibrations. When you touch these pipes, you can feel the vibration. When the fluid is not flowing or the compressor is not running, of course you don’t feel anything. Then it is quiet in the house.
The outdoor unit is mounted on the facade (see photos). It stands on dampers. The mentioned pipes run from inside through the house wall to the outside (see photos). I noticed that the holes where the pipes were pulled through were simply closed with concrete (see photos). I see no special channel to prevent contact between pipe and concrete. Therefore, I assume that the vibrations from the pipe are transmitted directly to the wall.
Would you also consider this the cause?
Finding a solution: I was thinking about placing the indoor unit on a mat and additionally wrapping the already white-insulated coolant pipes (see photos) with soundproofing material. Do you think that would help? Or is the core of the problem the passage from inside to outside? I also thought about whether placing the outdoor unit on a concrete base would help. But as long as these white pipes have direct contact with the concrete elements, the problem will remain.
How do your coolant hoses run from inside to outside?