S_t_e_p_h_a_n
2020-12-26 14:34:57
- #1
Hello everyone,
I have a gas boiler and underfloor heating in my house (built in 2005). The flow temperature is about 30 degrees.
I had a pump from Grundfos (I also estimate from 2005), it always made hissing noises, allegedly was not running properly anymore and was replaced by the plumber.
All rooms in my house still got warm.
I now have a new pump from Grundfos again (also Alpha1 25-60/180) and my living room no longer gets warmer than 20 degrees, although 22-23 degrees are set. Behind the pump, 30 degrees are still displayed.
The new pump was installed backwards because the plug otherwise did not fit, see photos. No idea if it might be rotating backwards.
I didn't hear the old pump at all, except for occasional hissing noises. The new pump is very loud, depending on the setting.
I couldn’t make sense of the manual either. There are three settings with three levels each. See photos.
The photos always show the level with the highest setting.
Does anyone maybe have an idea how I should set the settings? Is it normal that the newest pump is the loudest? I have other pumps installed that run without any noise.
You can listen to the hissing noises here: [MEDIA=youtube]ZOalD_niKyg[/MEDIA]
Merry Christmas and thanks in advance
Stephan



I have a gas boiler and underfloor heating in my house (built in 2005). The flow temperature is about 30 degrees.
I had a pump from Grundfos (I also estimate from 2005), it always made hissing noises, allegedly was not running properly anymore and was replaced by the plumber.
All rooms in my house still got warm.
I now have a new pump from Grundfos again (also Alpha1 25-60/180) and my living room no longer gets warmer than 20 degrees, although 22-23 degrees are set. Behind the pump, 30 degrees are still displayed.
The new pump was installed backwards because the plug otherwise did not fit, see photos. No idea if it might be rotating backwards.
I didn't hear the old pump at all, except for occasional hissing noises. The new pump is very loud, depending on the setting.
I couldn’t make sense of the manual either. There are three settings with three levels each. See photos.
The photos always show the level with the highest setting.
Does anyone maybe have an idea how I should set the settings? Is it normal that the newest pump is the loudest? I have other pumps installed that run without any noise.
You can listen to the hissing noises here: [MEDIA=youtube]ZOalD_niKyg[/MEDIA]
Merry Christmas and thanks in advance
Stephan