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

Heating, insulation, ventilation, VMC, cooling ... short thermal comfort. Insulation, wood energy, heat pumps but also electricity, gas or oil, VMC ... Help in choosing and implementation, problem solving, optimization, tips and tricks ...
Did67
Moderator
posts: 20362
Registration: 20/01/08, 16:34
Location: Alsace
x 8684

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

Yes, the room sensor shifts on a parallel. But suddenly, your foot is wrong.
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Phil532140
I learn econologic
posts: 39
Registration: 01/03/18, 14:49

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

Dirk,
I'm not very good at maths ...
Can you give me the calculation formula to find the theoretical water T ° from these values:
[A] = -10 (mini winter t °)
[B] = 79 (t ° of water at -10)
[C] = 19 (min summer t)
[D] = 36 (t ° of the water for 19 °)
[F] = 20 (no heating temperature)
[G] = 25 (min t ° of water)

Philippe.
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dirk pitt
Econologue expert
posts: 2081
Registration: 10/01/08, 14:16
Location: isere
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## Re: Need advice ... What settings for a pellet boiler?

second math course: equation of a straight line.
coef director (slope) = m = (Yb-Ya) / (Xb-Xa)
intercepted = Ya-mXa
in your case: slope = -1.48
origin = 64.1
with that, you can calculate the theoretical start time for all ext temp.
for example: if temp ext = 5 °
start time = -1.48 * 5 + 64.1 = 56.7
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Phil532140
I learn econologic
posts: 39
Registration: 01/03/18, 14:49

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

Thank you it's true that in the second I preferred English
Aie aie ... The maths and me ... on the ordinate at the origin I find 50.83 and not 64.1, there's something I did not get it?
And the set temperature does not enter the formula?
Phil.
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Phil532140
I learn econologic
posts: 39
Registration: 01/03/18, 14:49

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

And while I am there, I will also like to understand the role of the minimum water temperature in the calculation of the flow temperature. If we increase this min T ° we increase the starting t °? This is the parallel?
Goods.
Philippe.
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Did67
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posts: 20362
Registration: 20/01/08, 16:34
Location: Alsace
x 8684

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

To my knowledge, she does not intervene.

Min temp, like "max" temp, are in fact limits. If the calculation gives values ​​going above or below, the value is not taken into account. When the limits are reached, either the start is limited to the maximum (eg to prevent heated floors from "overheating"). Either the heating stops (mini), because we estimate that we are wasting energy (circulators, etc.) for something that is no longer useful
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Phil532140
I learn econologic
posts: 39
Registration: 01/03/18, 14:49

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

Thank you Did67 for this answer. Dirk pitt can you tell me how you find 64.1?
And why the setpoint does not enter the calculation?
Unless I do not understand everything ;-)
Thank you very much.
Philippe.
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sicetaitsimple
Econologue expert
posts: 9276
Registration: 31/10/16, 18:51
Location: Lower Normandy
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## Re: Need advice ... What settings for a pellet boiler?

You can write it differently:

Tdpart = 36 + 1,48 * (19-Text)

The set temperature (19 or 20 ° C that you wish to have inside), or rather the difference between the temperature observed and this set temperature, intervenes in correction of this basic curve, in more or less . That's why it's best to disable it to do the exercise suggested above by Dirk Pitt.
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Phil532140
I learn econologic
posts: 39
Registration: 01/03/18, 14:49

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

Ok in this case for 2.9 ° outside, I must have for a slope of 1.43 with 18 ° requested:

36+1.43*(18-2.9) = 58.34

Off the boiler sends me a starting T ° calculated 44 ° ... But the house is good to 18 ° ... I do not understand
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Phil532140
I learn econologic
posts: 39
Registration: 01/03/18, 14:49

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

Thank you all.
In fact, I really have the impression that my boiler is not powerful enough. Still unable to deliver 60 ° (Departure setpoint) this morning (it tops out at 47 ° at the start) ... In addition, after a few cycles it stops (It displays STOP ... It must estimate that the difference between the Departure temperature and return temperature allow it and that she can "live" on her reserve?) Do you have any idea?
Otherwise ... In short we will do with waiting to change or find a complementary solution when the T ° is less than 5 °
0 x

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