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Central Heating Pipes Knocking Near Differential Valve When Stove Cools to 36°C

cris93 27765 26
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 11143610
    cris93
    Level 9  
    Hello everyone. I have the following problem and I have not found a clear answer what to do. Well, the point is that when the stove goes out, at a temperature of about 36 degrees, it starts knocking and jerking the tubes (as if it would break them immediately). I think the sound is coming from the differential valve. I am asking for advice on what to do in this situation. I would like to add that I do not know much about this field :D
    I am throwing in pictures of the layout in the basement. Central Heating Pipes Knocking Near Differential Valve When Stove Cools to 36°C Central Heating Pipes Knocking Near Differential Valve When Stove Cools to 36°C Central Heating Pipes Knocking Near Differential Valve When Stove Cools to 36°C Central Heating Pipes Knocking Near Differential Valve When Stove Cools to 36°C Central Heating Pipes Knocking Near Differential Valve When Stove Cools to 36°C Central Heating Pipes Knocking Near Differential Valve When Stove Cools to 36°C
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  • #2 11143743
    MARCIN.SLASK
    Home appliances specialist
    The check valve (pump differential) is supposed to be vertical and I see it horizontally mounted.
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  • #3 11143855
    cris93
    Level 9  
    so you mean the one right above the pump? he is upright :D I guess you meant it should be horizontal :D unless it is about some other valve and I misunderstood.
  • #4 11144720
    Ireneusz Oleksiak
    Level 2  
    The green valve in the first photo should be vertical and in line with the arrow.
    Regards
    irek
  • #5 11144919
    mikee82
    Level 12  
    If there is a symptom of "jerking" with the pipes, and the knocking occurs when the temperature of the heating medium changes, it is most likely caused by the thermal operation of the pipes.
  • #6 11145014
    cris93
    Level 9  
    knocking and jerking of pipes occur together in a pair. but as I wrote, it seems to me that this valve jerks them so much. what do you recommend to do? can it somehow be repaired or something additional to be installed?
  • #7 11146196
    malez4
    Level 23  
    Rebuild the system so that the differential valve (green) works in a vertical configuration - above the boiler outlet, and the circulating pump - vertically upwards above the boiler outlet (the check valve after the pump may be, but not necessarily, It can be replaced without draining the system). Lots of space, so it shouldn't be a problem. There was knocking and jerking from the very beginning, whether it appeared after reworking the installation.
  • #8 11146947
    cris93
    Level 9  
    It appeared after replacing the boiler and the installation ... The installation was copper from the beginning .. There was no differential valve in the previous installation .. What if the differential valve was removed? Does it play an important role? What do you think about such an idea?
  • #9 11147044
    Polon27
    Level 18  
    Hello. The task of the differential valve is to pass the gravity circulation when the pump stops generating overpressure and stops closing it. This happens when the pump is switched off, e.g. due to a power cut. The best version of the assembly was given by a colleague malez4 and this is how it should be installed, although some valves can also be mounted horizontally. In general, it is better to have such a valve in the pipeline, do not remove it. This knock is a certainty that this is the valve. You write that this happens when the boiler is put out. This is where the pump probably turns off and clicks. After a while, when the temperature of "stationary" water in the boiler increases, the pump is turned on again, after a while, when it pumps the water, it turns off again, etc. .... It generates a knocking every time. Read the hysteresis of the pump controller. It should be at least 5 degrees.
  • #10 11147148
    cris93
    Level 9  
    Only when I turn off the stove, it stops knocking ... Sometimes it can knock for a few minutes .. When it goes out during the day, no problem because you can go down and turn it off .. The worst thing is at night then it knocks so much that it wakes everyone in the house; /
    The only thing I found about the hysteresis is the hysteresis of the boiler and the boiler. But I can change this in the furnace settings .. The boiler hysteresis is 5 degrees. I would like to add that the boiler is R-ECO M26
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  • #11 11147943
    Ireneusz Oleksiak
    Level 2  
    The green valve in the first photo is a check valve to be installed vertically in line with the arrow on it.
    Each material, when it cools down, shrinks (reduces its volume). When pipes get hot, they also "puff" because they expand. The water also reduces its volume as it cools down and in this case it returns and causes the valve to knock, but if the valve was vertical, it would not knock, because it would close and the water would return to the furnace through the lower entrance of the furnace. But is this valve at the exit of the furnace or at the return? ... should be at the hot water outlet of the stove
  • #13 11148013
    cris93
    Level 9  
    it is installed at the exit of hot water from the stove. What if you were to look for a differential valve that could work in the level mentioned in the previous post? such an exchange would give something?
    here they write about this product that it can work horizontally:
    http://www.tech-pol.pl/produkty.html

    Added after 5 [minutes]:

    it seems to me that the system is closed .. and the boiler is solid fuel
    but I forgot to write about one thing. the boiler is in the basement and on the ground floor and on the 1st floor I have all these collectors installed, so if there is no electricity, the system does not work by gravity anyway because it does not push water through these collectors .. so I have to turn off the stove so that it does not burst the system or connect the pump to the generator ..
    I attach a photo of the collector on the 1st floor: Central Heating Pipes Knocking Near Differential Valve When Stove Cools to 36°C
  • #14 11148861
    MARCIN.SLASK
    Home appliances specialist
    cris93 wrote:

    it seems to me that the system is closed .. and the boiler is solid fuel
    but I forgot to write about one thing. the boiler is in the basement and on the ground floor and on the 1st floor I have all these collectors installed, so if there is no electricity, the system does not work by gravity anyway because it does not push water through these collectors .. so I have to turn off the stove so that it does not burst the system or connect the pump to the generator ..


    The layout must be rebuilt. Provide emergency power to the pump. When there is no electricity, and there is no gravity water circulation, the stove will quickly boil water. It can be even seconds (depending on how much it is burning).
    Although there is some safety valve?
  • #15 11149008
    cris93
    Level 9  
    there is a safety valve .. it blows water on the basement in case of something ... it will probably be the reconstruction of the system with the 6th ... so only the reconstruction of the system is possible?
  • #16 11149885
    malez4
    Level 23  
    There is not much to rebuild with this system and it is worth doing it almost at no cost. As for the emergency power supply, it is some used UPS and a passed car battery.
  • #17 11151318
    malez4
    Level 23  
    Author's words "system through collectors does not work by gravity". So why the differential valve?
  • #18 11152416
    cris93
    Level 9  
    I don't know why they installed it ... they knew about the collectors .. can it be unscrewed if it is unnecessary ??
  • #19 11162128
    cris93
    Level 9  
    someone will answer
  • #20 11162159
    malez4
    Level 23  
    Rebuild the circuit and throw away the differential valve.
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  • #21 11163118
    cris93
    Level 9  
    What if, in place of the differential valve and these tees, put a pump there and get rid of this section, where is the pump now? such a modification can be?
  • #22 11163435
    k0s10r
    Level 19  
    tweak the layout first for safety and then worry about the rest. You're sleeping on the bomb!
  • #23 11163520
    cris93
    Level 9  
    reworking the UPS by adding a car battery to it ... so it will last longer if necessary ... and the modification that I proposed could be or not?
  • #24 11167395
    saskia
    Level 39  
    Draw a diagram of this circuit so that you know what is what and where.

    The reason for the knocking may be the boiler itself. As you write, it started to knock after installing the boiler, so it is possible that it is the "hammer".
  • #25 11171381
    pablowp1
    Level 23  
    From my assessment it appears that the differential valve is knocking, which - as someone has already written - is not needed. Well, it's not because you have collectors, so forget about gravity. Take that green out, make the installation safer and then nothing will wake you up and you will get rid of the bomb in the basement.
  • #26 11171613
    cris93
    Level 9  
    safer ?? more specifically something can be written about this safer installation?
  • #27 11174118
    k0s10r
    Level 19  
    Open circuit, nothing is safer.

Topic summary

The discussion revolves around a problem with knocking and jerking noises in central heating pipes when the stove shuts off at around 36 degrees Celsius. Users suggest that the issue may stem from the differential valve, which should ideally be installed vertically to prevent such noises. The knocking is attributed to thermal expansion and contraction of the pipes and water, exacerbated by the valve's position. Recommendations include rebuilding the system layout to ensure proper valve orientation, considering the removal of the differential valve, and ensuring the system has an emergency power supply to prevent overheating during power outages. The importance of maintaining a safe installation is emphasized, particularly in systems with solid fuel boilers and collectors that do not allow for gravity circulation.
Summary generated by the language model.
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