Temperature Setting for Gas Combi Oven: Minimum Temperature, Rust Prevention, Night Shut-off

How to set the minimum temperature on the gas combi oven (natural gas) so that it is not eaten by rust and that it does not burn too much gas. Is it possible to turn off such a furnace at night in order to save gas? It is mainly about the transitional period.
Regards: MS

Install the room controller and the temperature should be set to about 70 degrees Celsius. The boiler power setting remains, because often 21-23 kW is an exaggeration.

And how many kW does the boiler have and how many meters it heats?

70 ° is probably a big exaggeration, the room controller does. I have 50 ° on the stove and room control set, and the stove can start up even in August with an open window and on cool mornings.

This is an exaggeration, because the best parameters for the boiler heats up faster and the controller will cut it off itself.

The temperature in the installation should be appropriately selected to the prevailing external conditions and the insulating properties of the building. Too high means excessive chimney losses. Too low is the lesser evil, it is too cold. The room thermostat is like a brake in a car, nobody keeps the gas on the floor and the speed is regulated by the brake. The room thermostat primarily protects the rooms against overheating, especially in transitional periods, ie when it gets warm unannounced, and lowers the temperature during, say, the night and when everyone goes to work, school, etc. As for faster heating at a higher temperature. circuit, I will use the analogy of the car again. Pushed the gas to the metal every time you start driving will surely give us the result of frequent visits to the gas station. greetings

Regarding the car, at which engine speed we have the lowest fuel consumption - at the highest torque and these are not idle engine revolutions.

maria35 wrote:

How to set the minimum temperature on the gas combi oven (natural gas) so that it is not eaten by rust and that it does not burn too much gas. Is it possible to turn off such a furnace at night in order to save gas? It is mainly about the transitional period.
Regards: MS

The temperature must be set in such a way that for a given building, installed radiators and weather, it is sufficient for the desired thermal comfort. If there are thermostatic valves in the system, when the temperature in the rooms is reached, the radiators will stop receiving heat and the boiler will turn off. Therefore, the temperature control in the circuit is not related to the gas consumption. Unless you set it too low, it will be too cold at home and you will use less gas. Turning off at night will do nothing - the boiler has to make up for the loss during the day. If you want to save, just turn the thermostats on the radiators at night

As for the car, the car goes downhill and downhill.

The presentation of the car clearly illustrates how the boiler operating temperature should be set. The engine can rotate up to about 6500 rpm, and while driving normally, we oscillate so that the revolutions in each gear are max 4000 rpm, i.e. 2/3 maximum. Same with gas stove 2/3 max. boiler temperature. The rest should be handled by the room temperature sensor and the outside temperature sensor.

I have a heating surface of 120 m, a 24 kW boiler.
Everything is correct. I know that too high temperature in the boiler means additional losses. I mean the lowest temperature. What should it be so that no water would drip and the boiler would not be eaten by rust. Before the season I cleaned the boiler and it was more rusty than dirty. When I had an oil burner, the boiler was quite dirty with oil combustion products, not rust, now the opposite is true. I have a room controller and thermostats on the radiators installed. Another question is whether by reducing the temperature in the rooms at night, should you also reduce the temperature on the stove?

The question is why, the room regulator will turn it off by itself. I suggest reducing the power to what (up to 12-15 kW) if there is such an option on the boiler plate, temp. 60-70. In the room with the regulator, turn the radiator thermostat up to max.

I am just starting to work with a condensing gas furnace
single-function and if the DHW supply temperature is set to a higher value
I set the heating supply temperature to 35 degrees. and so far it's ok
I just don't know what will happen when the frost starts - big tests so far
but in any case, you can see that the condensation in the oven works, because it is quite a lot
the water flows from the furnace all the time and so far, at the current temperature, 8-12 degrees Celsius on the day.
for kitchen, hot water and heating I use 3.5-4.5 m3 of gz50 a day in a building of 610 m3
cubature of 12 cm of insulated polystyrene and 21 cm of wool on the attic
and the new building has only been inhabited for 20 days

interjects - it seems to me that the power of the boiler should not be maximum - rather at 2/3 of the power. Why heat the chimney?
Select the water temperature in the installation according to the external conditions - the colder it is outside, the higher the temperature.
I do this:
- outside approx. 5 degrees -> water 40 degrees
- outside approx. 0 degrees -> water 45 degrees
- outside approx. -5 degrees -> water 55 degrees
- even colder - water 63 degrees

But it depends on radiators, insulation and other things ..
In my opinion, it is best to observe the breaks and the duration of the stove's operation .. If the stove is only turned on for about 30 minutes and it is enough to heat the house, I reduce the temperature by 5 degrees of water ...
I try to keep the stove running for at least 1 to 1.5 hours and then the same or longer break ...

And it is not better to install a weather forecast, it is easier and more pleasant.

aqueduct, not everyone can afford it, but it is easier and nicer for sure

I read it, but tell me what is the room regulator is set to 20 C, the pic has water of 70 C and the radiator by the boiler, i.e. the kitchen hot but only the top, the bathroom hot all over, the room where the regulator burns but only the top? am I picking on?

reduce water on the stove - too much ..
As for the radiators: they are difficult to heal from a distance ..
Maybe the air in the kitchen?
Check and bleed ...

Hello ... I will step up with one question.

How is it more economical to heat with a single-purpose condensate?

-reduce its power, but it will heat for a long time, e.g. every 35-40C
if
- more power but shorter operation of the stove, e.g. 55-60C

sivvusek wrote:

Hello ... I will step up with one question.

How is it more economical to heat with a single-purpose condensate?

-reduce its power, but it will heat for a long time, e.g. every 35-40C
if
- more power but shorter operation of the stove, e.g. 55-60C

It's definitely the first.

That's one more question ...

Central heating pump speed (gear)

Better weaker and longer flow time with colder return and longer furnace operation time ...
if...
medium or maximum pump, i.e. faster circulation, shorter operation time of the furnace but warmer return.

Single-function condensate stove.

Not exactly like that. Regulation of the pump rotational speed allows flexible selection of its performance in a limited range. A small and not too extensive installation is enough on the 1st, the larger on the 2nd and the large on the 3rd. It is known that increasing the flow velocity also increases the noise level of the installation. The return temperature should also not be too low (dew point and corrosion). When a differential valve is used in coal-fired furnaces, it sometimes happens that the pump only closes the flow on the differential on the 3rd.

I also have this question. I have 70 degrees on the gas one
and the carbon thermometer shows 55 degrees or does it mean that I have 15 degrees
losses through the heat exchanger ??
Question 2. At night I am set to 16/17 degrees and on 18/19, even after 5 hours of continuous heating, I will not reach 20 degrees during the day. It is a new installation. The house is partially insulated. It seems strange to me.

Hello.
A simple question turned into an off topic discussion.
1. As the description shows, you have a boiler with a gas burner. (You did not specify the boiler type) In this case, you need to install a thermostat that will turn on the pump when the boiler temperature reaches around 35 ° C. This is the boiler's dew point. This protects against condensation in the combustion chamber. A steel boiler requires a higher temperature than a cast iron one.
You can also install a thermostat with a range of 40 - 80 degrees Celsius. Then the thermostat will not allow the boiler to cool down during standstill. The room thermostat is the next adjustment item. And here my predecessors are right.
2. In condensing boilers, the best effect is obtained with the lowest possible return temperature. The boiler condenses at a return temperature of about 50 degrees C.
This can be achieved by:
- oversizing of radiators,
- low flow velocity,
- appropriate selection of the supply temperature.
All this should be selected at the design stage.
Installing a condensing boiler without preparing the installation for it is pointless.
Uniform water distribution in the system is controlled by thermostatic valves with pre-regulation or by valves on the heater return. All radiators should have the same temperature when the boiler flow temperature is constant. The further from the boiler, the greater the flow and the lower the supply temperature (losses).
greetings

Ferroli boiler with lock combustion chamber F24, the pump activation sensor is. room thermostat as well. Is it quite important not to cool the coal boiler? >? Does this mean that I have to maintain a constant pace 24 / h a day?

Sorry. The entry about the oil burner confused me. I thought it was the same boiler.
Solid fuel boilers have different rules. Here, too, it is worth installing a thermostat to start the pump.
In gas boilers, the so-called weather conditions, corrosion of the exchanger is caused, among others, by a too lean mixture (excess air). Check the gas consumption on the meter in relation to the set power. From 1 m3 of GZ 50 gas we have 9.5 kW of power. Measure the number of liters of gas in 36 seconds and multiply by 3600. This will give you the consumption in m3 / h. At this power, it should consume about 25 l. This is an approximate measurement. You will accurately adjust the analyzer will burn.

Added after 3 [minutes]:

Sorry. Multiply the result by 100.

Hello. I would like to add to the topic.
Two weeks ago I fired the De Ditrich MCRIIT 24 Kw stove, single-function condensate with a 120 l tank. And I have a problem with the temperature at home. I have the water in the DHW set at 47 degrees. But if I do not heat, I have cold or lukewarm radiators on the floor.
The floor on the top will not budge. The ground floor of the radiators is slightly warm, the floor heating is ok. 120m2 is not done ...
Anyway, I have a cold at home ... The worst on the floor, the difference between the bottom is even 2 degrees.
I have a room regulator in the living room plus a weather sensor outside ... Thermostats in radiators open to max.
I don't know what to do ... maybe someone made something wrong ...?

Please help

Maybe. Take the room thermostat to cooler rooms, and in these, set the thermostatic heads to the desired temperature. Besides, maybe your heating curve is too low.

Hello.

I am a new person on the forum but have been watching them for several weeks because I have huge problems with my stove, and I decided to ask.

This year, I moved home ;-)

I have problems with heating this house, what is the problem? Initially, there was a gravitational system here, but I added a pump, I also put in an electronic thermostat (measuring the temperature in the room) and everything would be ok if it were not for the fact that the stove, even if I asked it, begged, threatened to be nervous, does not want to exceed 58 degrees Celsius. Every day I need a slightly higher temperature, up to 80 degrees because I have very large non-tightness related to the windows. Can anyone tell me how to force the stove to higher temperatures?

What fuel is this stove for?