How to Set Up a Grundfos ALPHA2 for Optimal Heating

Learn how to set up your Grundfos ALPHA2 pump for optimal heating system performance. This step-by-step guide will walk you through the different functions and settings of a Grundfos ALPHA2 and show you how easy it is to select select the right variant for your system.

Find out more about the AUTOADAPT feature and see which of the ALPHA2 modes works best for radiator applications and underfloor heating.

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[DummyCrosS]

Not all information I needed, but I still now know how to use this pump. Chart at the end needs to be explained more, for example: what are the last two icons in the application block?

[patissiano]

I have alpha2 and I am using the proportional mode (cause i have radiator and floor heater).
I want to find the most energy efficient settings, my question is: what is the minimum and maximum for water consumption m3/h my Pump should it use.
Let's say, its should not go under x.x m3 and not higher that x.x m3.
Thank you so much for your help.
Br
Ramy

[saleemhussain]

Can we use an App with pump? To control the underground floor heating temperature?

[zuilok]

I have a question. I currently have a normal dumb pump in my heating circuit. Which is controlled by my wood furnace (it turns it on when my furnace heats up and turns it off again when its cold) Would this pump be any benefit in my system or should I just stick with a simple pump?

[RedBoss]

Hello,
i have Alpha2, and its new for me, and i have difficult time to set it up correcly, i have radiators (4pcs) and floor heater (27m2, + - 70m pipes) two pipe system, and by manual i thought its a best constant pressure, but in your video it shows proportional mode for recomended, can you please help me understant this settings? and what would be ideal for me.
Thank you in advance for any help.
Dave.

[giuseppe]

Which application has functions similar to Grundfos go balancing and to work with old water pumps?
I need to enter the size of the radiator, the size of the room, the diameter of the pipes and the temperatures for each radiator ..+ the flow rate

 

To find flow rate I'm looking to measure the watts being consumed by pump, that’ll tell the head of pressure applied, from that the selected curve will show the flow rate available

Is available a software wher is possible to select pump name and wattage and to find flow rate?


What other tools are possible to be used in a old system for troubleshooting...?

[lidamark]

Dear Sir/Madam, I am asking you for the best heating effect with the Ecodan heat pump, should the output from the outdoor unit be higher than the pump's level of operation towards the radiators? Thank you.

[_____Shah_____]

This controls my Heating and water, mode is best please??

[jimmymac]

Ok it looks easy on that pump but l have a 15-50 130 and not the Same settings only pump speed and pressure ?? so l don’t know which it the optimal setting for domestic house heating system, the pump speed is running on 3 line setting yet l still have cold spots in some rads do l need to set the right hand side to cp1 or cp2 to get optimum pressure for the system ???

[roberthuntley]

I've got a question about my Alpha 2 15-60. I've been experimenting with the settings, and using the power display and pump curves to try and estimate the flow rate for my system. My problem is that the flow rate seems relatively constant, whatever I set the pump to. As an example, at Constant Pressure 1 it uses about 20 watts which according to the curve gives approx. 0.7 metres cubed per hour. Raising it to Constant Pressure 2 the power increases to about 34 watts, but according to the curves the flow rate appears to be pretty much the same. Any idea why?

1. Is a tabular, detailed, version of the pump curves available? Trying to read flow rates off of the small image in the instructions is pretty inaccurate.

2. My system is 1992 vintage, with 10 mm microbore pipe to each radiator. Does that imply that the flow rate is going to artificially constrained anyway?

Thanks in advance for any help.

[ZAPHCS]

its winter and my alpha2 is not working i just hear the pump trying to rotate but i get 0w and 0m3/h flow...

[khuantru]

is it recommended to leave the settings to 'auto adapt'?

[jhbonarius]

What if you connect the new pump to mains, you can hear it running, but the display stays dark? (no lights turn on)?
Is the pump defective? I just bought it and spend several hours installing it!?! Please tell me there's a simple fix.

[luckystrike]

So modern boilers have similar technology?
Can this be installed as a second pump on a Vaillant combi boiler for example?

[shashidharreddy]

Can I set the desired flow rate in this pump? I want to use it for my laboratory experiments for precision control flow rates.

[engjds]

Mine has one button, 3 power settting and 3 others (i, ii, iii), any ideas?

[michaelj]

The screen of my pump is just flicking and it is not pumping. Is there a reset option or will this need to be replaced?

[pauldownes]

I am a home owner and so my knowledge about gas central heating systems with radiators is pretty basic. I have had various old radiators replaced with new ones (no changes in the number or configuration of the radiators). The existing boiler (2 years old) and Grundfos ALPHA2 pump are upstairs.

One of the new radiators in the downstairs lounge only heats up 3 of the 5 vertical panels. The other 2 panels remain cold. There are no air locks.
The only way to force this radiator to heat up fully is by turning all the radiators in the house to maximum heat, and once all hot, turning all radiators off (apart from the lounge radiator).

If I turn the Grundfos ALPHA2 pump to the high Constant Speed setting (III) then this also seems to work.

My main question is “Is it okay to have the pump constantly set at this highest circulatory setting?”.
It is obviously using more energy and it is also more noisy.
Will I damage the pump?
Or should this mode only be used to vent the pump?

[konan]

the alpha 2 models are successful, but the ones from L to alpha 3 have a big problem because they no longer have a manual ventilation screw and if the self-ventilation is blocked, it's game over. they make noises like a train in the station and eventually break down. cheaper brands on the market that are all electronic and energy efficient too, it has, and Grundfos doesn't, it seems to me a big minus. and between alpha 2 and alpha 2 L there is a big price difference for having a manual-venting screw

[sploingg]

At 2.04 minutes 8 symbols are shown, please can you carify the meaning of each of them (assumptions are the mother of ....)