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ST-292V2 Wireless Thermostat: Optimal Hysteresis Range for Vaillant Stove & 56m2 Heating Area

ewjp 28176 14
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What hysteresis setting should I use on an ST-292V2 wireless thermostat for a Vaillant gas boiler heating about 56 m² with radiators?

For a radiator system, start with about 0.5–1.0°C hysteresis, not 0.2°C, because too small a band makes the boiler switch on and off too often [#16229342][#16229819][#16251664] If the system is underfloor heating, a smaller hysteresis can be used, but for radiators the valves should be fully open or removed to avoid interference [#16229342][#16229819] It is also worth checking gas consumption at two different settings on similar days, since the best value depends on the installation and comfort level [#16234133] One reply also notes that the room thermostat location matters and that there should be no thermostatic heads in the room where it is installed [#16251664]
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  • #1 16229290
    ewjp
    Level 11  
    Posts: 11
    Rate: 8
    Hello. I have a ST-292V2 wireless controller. It has a hysteresis range of 0.2-4 degrees. I have gas heating, Vaillant stove to heat about 56m2. I have a problem with choosing the right hysteresis, so that the thermal comfort is economically and comfortably maintained. Do you set a small (0.2) or larger hysteresis? I am asking for help and greetings.
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  • #2 16229342
    andrzej lukaszewicz
    Level 42  
    Posts: 7034
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    With radiators set higher, for example, + -0.5 degrees. With floor lower. If you have set the boiler, the boiler turns on and off very often, which is unfavorable for it.
  • #3 16229373
    ewjp
    Level 11  
    Posts: 11
    Rate: 8
    radiators have plates
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  • #4 16229819
    ls_77
    Level 38  
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    For the radiator system, something about +/- 0.5 to +/- 1.0.
    There is nothing too low because the boiler will be clocked. A little bigger will allow him to work longer, but with this size you can turn off faster (boiler thermostat) anyway. There is also nothing to set too much, because the temperature fluctuation will be noticeable.
    Of course, the heads on the radiators open to full or not removed at all.
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  • #5 16229896
    ewjp
    Level 11  
    Posts: 11
    Rate: 8
    I have an oversized boiler, it will turn off the boiler faster like a room controller with a large difference between switching on and switching off about 1 st. Probably shutting down the boiler three times before it reaches the set room temperature or is it supposed to be?
  • #6 16230766
    andrzej lukaszewicz
    Level 42  
    Posts: 7034
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    Rate: 2120
    This is to reduce the temperature on the boiler or use the weather sensor and experiment with the curves.
  • #7 16230893
    ewjp
    Level 11  
    Posts: 11
    Rate: 8
    Do you really want to reduce the temperature on the boiler, or rather increase, because the heaters I have selected at 75st. Power.
  • #8 16231670
    andrzej lukaszewicz
    Level 42  
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    Rate: 2120
    It's probably at -20 degrees outside, teaz is 0 degrees, so you can boldly diminish the temp.
    It is like you would drive around the city from lights to lights 100km / h - sharp starting and braking, and the one who is driving 40km / h is next to you at the traffic lights, only commutes later as you wait anyway. Theoretically, there is such a speed, while the slower one will not stop at all, because if he travels slowly he will get to the next lights and he will be "green".
    Who do you think will consume more fuel and brakes?
  • #9 16232083
    ewjp
    Level 11  
    Posts: 11
    Rate: 8
    You are right Mrs. Andrzej, only at low temper. on the stove I will have more boiler starts + burner block before it reaches the set room temperature. Will it not affect gas consumption? Currently, I have set the temp 58st., Hysteresis 0.4, the stove starts 4 times (clocks) before it is turned off by the room controller.
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  • #10 16234133
    andrzej lukaszewicz
    Level 42  
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    In practice, it proposes to check the consumption of gas at two different temperature settings, eg during the day, two consecutive similar "temperature" days.
  • #11 16251664
    hemicznyali
    Level 15  
    Posts: 115
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    ewjp wrote:
    I have an oversized boiler

    What is this boiler, maybe it has a maximum power limit, and the temperature should be set to the design temperature. Hysteresis approx. 1 degree if it is possible to control the pump run-out time, then you should experiment with these settings.
    If, on the other hand, it is not possible to limit the power, the setting of a higher flow temperature will still be more economically advantageous in spite of everything.
    And Mr. Andrzej probably had power in mind.
    The installation location of the room thermostat is also very important, remembering that in the room where it is installed there can not be thermostatic heads on the valves.
  • #12 16251697
    ewjp
    Level 11  
    Posts: 11
    Rate: 8
    hello p.hemicznyali boiler is Vaillant Atmotec Pro Vuw 200-3 MH with an open combustion chamber I have limited power to a minimum of 8kw but it is too big to my surface (55m2) temp set to 60st. I do not know if it's good ? pump overrun 3 min, burner lock at 60st.6 minutes or the computational temperature is the one for which the radiators were selected
  • #13 16251755
    hemicznyali
    Level 15  
    Posts: 115
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    With this surface, about 6kW should be enough, it is not so bad when the outside temperature is around -25 degrees worse when it is around 0.
    How old is this boiler?
    You could figure something out, but unfortunately in this forum such advice is not welcome so I will stop.
    I will look for documentation if I find something to this appeal.
  • #14 16251786
    ewjp
    Level 11  
    Posts: 11
    Rate: 8
    hemicznyali wrote:
    With this surface, about 6kW should be enough, it is not so bad when the outside temperature is around -25 degrees worse when it is around 0.
    How old is this boiler?
    You could figure something out, but unfortunately in this forum such advice is not welcome so I will stop.
    I will look for documentation if I find something to this appeal.


    the boiler uses the 2nd season thanks to something e-mail please
  • #15 21757778
    michalbirecki
    Level 1  
    Posts: 1
    >>16232083 Definitely too high a temperature, set 45°C.
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Topic summary

LABEL_AI_GENERATED
Discussion about choosing the hysteresis setting for an ST-292V2 wireless room thermostat used with a Vaillant gas boiler heating about 55–56 m². The advice is to use a moderate hysteresis rather than the minimum value: around ±0.5 to ±1.0 °C for radiator systems, because too small a hysteresis causes frequent boiler cycling, while too large a value increases noticeable room temperature swings. The boiler’s flow temperature, burner lockout, pump overrun, and possible power limitation were also discussed as factors affecting efficiency and comfort. It was suggested to test gas consumption under different temperature settings and to keep radiator thermostatic heads fully open or removed in the room with the thermostat.
AI summary based on the discussion. May contain errors.
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