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Need advice ... What settings for a pellet boiler?

published: 02/03/18, 06:21
by Phil532140
Hello everybody.
I just bought a house. The latter is equipped with a Hapéro HP2 pellet boiler. So far it worked pretty well ... And this week the -8 ° C ext made me look at the settings. Because instead of 19 ° setpoint we were closer to 17 ° ... Impossible to do more.
The boiler "goes out" on a v3v which supplies the circulator then the radiator circuit.
This circulator operates when the temperature of the water leaving the valve 3v is greater than 55 °.
The problem is that if I need (we can talk about the heating curve later ...) water 65 ° to get my 19 °, the circulator starts when the water is to 55 ° and, instead of sending a water to 65 °, it sends it to 55 ° ... It's as if the boiler did not have time to heat up ...
So I changed the parameter 55 ° (which triggers the circulator), I put 65 °. I feel like it works a little better but I would like to have your opinion.
I'm also thinking about the speed of the circulator?
What do you think ?

For the heating curve I have:
-10 ° => 80
20 ° => 35
Min 35 water temp

This is an old house very long to heat that has a renovated part better isolated. Thermostats equip the radiators (except in the old part which rarely reaches the set temperature)
For you, is this curve good?

Thank you for your feedback
Philippe.

Re: Need advice ... What settings for a pellet boiler?

published: 02/03/18, 16:52
by Philippe Schutt
Hello,

Can you provide a diagram? Is there not a circulator in the boiler with a thermostatic V3V?
Your motorized V3V is open wide with -8V outside?

And finally:
what does your DPE say and how powerful is your boiler?

Re: Need advice ... What settings for a pellet boiler?

published: 02/03/18, 18:07
by Phil532140
Hello Philippe,
Thank you for your answer.
I do not have a diagram but a photo:

Image

https://photos.google.com/share/AF1QipM ... o1NGFfRzl3

I do not know what's inside the boiler ...
Yes the V3V is fully open when the demand is felt
The boiler has a power of 15 KW

For the ECD which figures are important?
Average annual heating consumption: 16500 kWh PCI granules
Housing is rated C (Like what DPE is anything ...)

I hope this will allow you to analyze.
Philippe.

Re: Need advice ... What settings for a pellet boiler?

published: 02/03/18, 18:47
by sicetaitsimple
Hi,

it's very basic as a question and you'll excuse me if you've done it, but have you done a test by opening all thermostatic faucets thoroughly?

Re: Need advice ... What settings for a pellet boiler?

published: 02/03/18, 19:25
by Phil532140
Sic'etait simple ... It's worse ... I thought precisely cut some radiators in the unused rooms if the power is not enough ... I'm good?

Re: Need advice ... What settings for a pellet boiler?

published: 02/03/18, 19:35
by sicetaitsimple
Phil532140 wrote:Sic'etait simple ... It's worse ... I thought precisely cut some radiators in the unused rooms if the power is not enough ... I'm good?


No, I do not think so!

I was talking about a test to see. Your radiators can be globally or occasionally undersized, it happens. And your thermostatic valves will at best do nothing (stay fully open) in the event of extreme cold, but often "restrict" the flow a little because they do not feel the "real temperature" in the room if it is rather cold.

The purpose of the test is to maximize the flow of water to verify that your boiler follows by working longer on for example one hour.

Easy to check with a little time and a timer.

Re: Need advice ... What settings for a pellet boiler?

published: 02/03/18, 20:53
by sicetaitsimple
Complement: in other words, depending on the size of the radiator and the part concerned (exposure, insulation), it is not necessarily abnormal to adjust the thermostatic valve on 23 ° (for example) to obtain 20 ° C when it does very cold outside. Just know it, they are still very rustic devices, very practical especially to maintain unoccupied parts at temperate temperatures but relatively low.

Now the boiler must follow. 15kW it's not huge. Your house does what surface, and what year of construction?

Re: Need advice ... What settings for a pellet boiler?

published: 03/03/18, 06:19
by Phil532140
My house is 150 m2. 1 old part (70m2) of before 1948 (as they say ...) and another new part (80m2), contiguous to the premiere of 2000. A single window on the north side, the rest of the openings to the south and west.
I'm afraid the boiler is not powerful enough. But I will have to deal with it for the moment. In your opinion what should be the mini power? And are the values ​​of my heating curve correct?

Re: Need advice ... What settings for a pellet boiler?

published: 03/03/18, 10:14
by sicetaitsimple
Phil532140 wrote: In your opinion what should be the mini power? And are the values ​​of my heating curve correct?


Regarding the heating curve, if you say that in the old part in normal (not very cold weather) you generally do not get to get the desired temperature, it is that you would be interested in the up a little.

For boiler power, it really depends on the house. Here is a link to a small simulator, without any guarantee!

https://elyotherm.fr/puissance-chauffage

Re: Need advice ... What settings for a pellet boiler?

published: 03/03/18, 10:32
by dirk pitt
it is far from being a trivial problem and above all, it is difficult to identify the cause. it is not at all sure that your problem is a power problem. I warn against the overpowering of granulated boiler because it is often worse than not enough power.

in the first place, the fact that your circulator is cutting below a certain value, it is just to protect your boiler from cold returns.
to increase this value to 65 ° will better protect the boiler but that's all.
the first thing is to analyze whether what you see is a transient or stabilized phenomenon.
indeed, your description resembles a fairly classic transient phenomenon:
the boiler is below the circulator threshold and rises in temperature
the temperature passes the threshold and the circulator turns
too much energy suddenly in the radiator network
the boiler temperature goes down and goes back below the threshold
the circulator cuts itself,
etc.
As a result, the radiator network sees only intermittent "flashes" of heat and the required temperature is never established in a stable manner.
if that's what happens, I suggest 2 things:
1: you decrease the flow of your circulator to the mini
2: If you have a manual valve on the radiator return, you close it partially, which creates a backpressure and reduces the flow.
it should already be much better.