ᐅ New pump causes issues, hisses, and room does not warm up properly
Created on: 26 Dec 2020 14:34
S
S_t_e_p_h_a_nS
S_t_e_p_h_a_n26 Dec 2020 14:34Hello everyone,
I have a gas boiler and underfloor heating system in my house (built in 2005). The supply temperature is around 30°C (86°F).
I had a pump from Grundfos (I think also from 2005), which always made a kind of hissing noise, supposedly was not running smoothly anymore, and was replaced by the plumber.
All rooms in my house still heated up properly.
I now have a new pump from Grundfos (again an Alpha1 25-60/180), but my living room no longer warms up above 20°C (68°F), even though it is set to 22-23°C (72-73°F). The temperature behind the pump still shows 30°C (86°F).
The new pump was installed the wrong way around because the plug otherwise didn’t fit, see photos. I have no idea if it might be running in reverse.
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, each with three levels. See photos.
In the photos, the highest setting level is always shown.
Does anyone have an idea how I should set the pump? Is it normal that the newest pump is the loudest? I have other pumps installed that run quietly.
Here you can listen to the hissing noises: [MEDIA=youtube]ZOalD_niKyg[/MEDIA]
Merry Christmas and thanks in advance
S_t_e_p_h_a_n
I have a gas boiler and underfloor heating system in my house (built in 2005). The supply temperature is around 30°C (86°F).
I had a pump from Grundfos (I think also from 2005), which always made a kind of hissing noise, supposedly was not running smoothly anymore, and was replaced by the plumber.
All rooms in my house still heated up properly.
I now have a new pump from Grundfos (again an Alpha1 25-60/180), but my living room no longer warms up above 20°C (68°F), even though it is set to 22-23°C (72-73°F). The temperature behind the pump still shows 30°C (86°F).
The new pump was installed the wrong way around because the plug otherwise didn’t fit, see photos. I have no idea if it might be running in reverse.
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, each with three levels. See photos.
In the photos, the highest setting level is always shown.
Does anyone have an idea how I should set the pump? Is it normal that the newest pump is the loudest? I have other pumps installed that run quietly.
Here you can listen to the hissing noises: [MEDIA=youtube]ZOalD_niKyg[/MEDIA]
Merry Christmas and thanks in advance
S_t_e_p_h_a_n
K
knalltüte26 Dec 2020 15:13Hello, my Grundfos Alpha had to be replaced a few weeks ago after almost exactly 13 years due to an electronic failure. If it ran the wrong way, I don’t think your heating system would work at all 😉
By the way, mine is whisper quiet...
I also believe that the heating system controls the pump. I wouldn’t change anything manually (stage I, II, or III).
Usually, Grundfos pumps come with a “loose” connector! Most likely, the installer just wanted to reuse the old cable because they were too lazy to connect the new one properly. Then it would have fit the right way.
Have you thoroughly bled the system and checked the water pressure? (The heating system is usually located at the lowest point, like a basement, and changing the pump doesn’t necessarily require this, but it might still help). The 23 watts seem quite high to me. I have never seen mine go over 18... My heating system also doesn’t run smoothly with too low pressure and air in the system...
By the way, mine is whisper quiet...
I also believe that the heating system controls the pump. I wouldn’t change anything manually (stage I, II, or III).
Usually, Grundfos pumps come with a “loose” connector! Most likely, the installer just wanted to reuse the old cable because they were too lazy to connect the new one properly. Then it would have fit the right way.
Have you thoroughly bled the system and checked the water pressure? (The heating system is usually located at the lowest point, like a basement, and changing the pump doesn’t necessarily require this, but it might still help). The 23 watts seem quite high to me. I have never seen mine go over 18... My heating system also doesn’t run smoothly with too low pressure and air in the system...
Similar topics