Junkers Zsb 14-3c - Boiler modulation how to set? Junkers Cerapur ZSB 14-3c

Hello. I have the furnace zsb 14-3c and cw400 module. Hot water radiators and underfloor. On the module I have information that the boiler power is 33% or 1/3 of the power, i.e. 4.5 kW. That's a lot considering that in papers and on the Internet they write about 2.9-3 kW. How can this be changed?

To change this, you must enter the oven settings and reduce the minimum fan speed.

I'll do it from cw400?

daro31ie wrote:

To change this, you must enter the oven settings and reduce the minimum fan speed.

rado084 wrote:

I'll do it from cw400?

Interesting theories!

Colleague, ask a professional to set the boiler correctly.

rado084 wrote:

Hello. I have the furnace in the Soviet Union 14-3c

rado084 wrote:

in papers and on the Internet he writes about 2.9-3 kW min.

In what papers?

hemicznyali wrote:

In what papers?

Friend, e.g. on the producer's website. I have exactly ZSB 14-3CE, I don't know what it is different ...:
http://www.junkers.pl/produkty/kotly/kotly-kondensacyjne/cerapur-smart-3ce.html

In addition, I would like to ask ... Gas consumption from 25.10.2016 to today (including the first heating, which was about 66 m3 of gas, walked 24 hours a day) is: 1018 (minus 50 m3 for the first start-up that gives 968 m3). Number of days 116 without first start. From my calculations the consumption is about 8.3 m3 per day. DHW set at 46 degrees, lowering to 38 for the night (the stove lowers to 15 degrees I don't know why ...). Biawar Quattro 140 L container. I attach photos from the value of the stove / burner:



I set my own heating curve, the influence of room temperature (I do not know what it is), etc. Heating circuit 1 is radiators, OG2 is floor heating. I attach photos from the settings:


Heating curve of radiators:


Floor curve:


The house has 150 m2 of usable space with a garage.
Ground floor:
One 120 cm v22 kermi radiator in the garage, 80 cm boiler room.
Living room + kitchen + hall 44 m2 - floor heating
Windbreak 4.5 m2 - underfloor + 60 cm radiator - 550 watts
Room ground floor 12 m2 - radiator 140 cm 1,460 watt
Bathroom 2.7 m2 - under floor + ladder radiator 400 watt

Floor:
Room 1 - 8.4 m2, 120 cm radiator, 1200 watt (balcony + slope window)
Room 2 - 14, 2 heater 100 cm 1100 watt (balcony + polar window)
Room 3 - 12 m2, 140 cm radiator, 1400 watt (2 windows)
hallway - 2.55 m2 floorboard
Bathroom upstairs - 7.20 m2 floorboard + towel rail radiator 700 watt
Laundry room - 12.5 m2 floorboard + ladder radiator 700 watt + 100 cm heater 1000 watt.

Please advise how to set the boiler correctly. In general it is cooler at the top than below.
What is the Temp gr. frost protection? What is the impact of continuous boiler setting below a certain temperature?
Can a minimum boiler operation of 33% affect higher gas consumption? For my mind, then, the stove would turn on ... Do I think right? Thank you and best regards

I would add that I live in Ostrołęka, Masovian Voivodeship.

rado084 wrote:

What is the Temp gr. frost protection? What is the impact of continuous boiler setting below a certain temperature?
Can a minimum boiler operation of 33% affect higher gas consumption? For my mind, then, the stove would turn on ... Do I think right?

rado084 wrote:

From my calculations the consumption is about 8.3 m3 per day.

Such wear at this surface, I think there is not much to save from, but only lower the temperature at home.
When the boiler works at a lower power for longer, its efficiency is higher when it comes to gas consumption, but here we also have electricity consumption by the pump running almost all the time!
If we knew how much we would save on one and how much we would add on the other, then probably boiler manufacturers would not earn that much. If you have instructions, everything is described in terms of frost protection, I will certainly not explain it more precisely.
The manual is not easy reading!

Thank you for your response. And please explain why when it reduces the temperature of hot water to 39 degrees it (useful temperature 46 degrees and reduction to 39 degrees, at night too much) on the regulator writes that the reduction rate is 39 and the set 15 degrees. However, when I set a 40 degree reduction, then it shows ok, i.e. the set temperature and a reduction of 40 degrees. Why is this happening?

rado084 wrote:

And please explain why when it reduces the temperature of hot water to 39 degrees it (usable temperature 46 degrees and reduction to 39 degrees, at night too much) on the regulator writes that the reduction rate is 39 and the set 15 degrees

I would have to sit at the regulator for a moment and analyze what you wrote, but unfortunately I'm out of the house and it won't work out of it. I do not want to make it up, I have a manual but it is not all the best of the so-called ground. I won't be home until Tuesday or Wednesday.
Best regards and enjoy reading.

hemicznyali wrote:

When the boiler works at a lower power for longer, its efficiency is higher when it comes to gas consumption, but here we also have electricity consumption by the pump running almost all the time!

The CH pump probably takes 20W per hour. However, I don't know how much the whole stove is. Because that's how the fan works.

I have to call a service technician because I noticed that, for example, DHW is 20 degrees, it does not heat it immediately, but heats it by 10 degrees and switches to CO and after 10 minutes CWU again and again until the desired DHW temperature is reached. Somewhere I saw that you can set priority but I don't remember where in cw400. It burns fuel for free because the stove heats up to 67 degrees and in a moment it cools down to the temperature of CO ...

rado084 wrote:

I have to call a service technician because I noticed that, for example, DHW is 20 degrees, it does not heat it immediately, but heats it by 10 degrees and switches to CO, and after 10 minutes DHW again and again until the desired DHW temperature is reached

The instructions are the answer to this problem.
Before you call a serviceman, I recommend reading, boiler instructions and CW400, it is a pity the money is all you can do on your own.

Thanks to you, I have also found it in the manual, but I do not understand something or I do not know ... Since the church is still switching between hot water and what is not uneconomical? After all, it raises the temperature to 67 and immediately lowers ...

Someone will write eco about it is it so economical?

in my opinion in eco mode there are larger temperature differences that do not have much influence on comfort. But it saves because the burner is less frequent but it stays on longer.

Returning to the topic ... What does position mean:
Influence of room temperature on a scale of 1 to 10k and correction of room temperature on a scale of 0 to 10k. How is this

The so-called. spare mode is some paranoia, probably the automation designer at Bosch had a bad day .... lol

Question Influence of room temperature on a scale of 1 to 10 and correction of room temperature on a scale of 0 to 10k.

The influence of room temperature, i.e. RA (Raumaufschaltung) gently shifts the heating curve that is already set on the weather-compensated control unit if the room temperature deviates from the setpoint.
This parameter should not be interpreted as the temperature value in K, i.e. in degrees - it is only a factor in the controller. 1 is OK and it's better not to change it.
Correction is a correction of the room sensor command. To set it correctly you need to have an accurate and checked electronic temperature meter

Added after 38 [minutes]:

The so-called. spare mode is some paranoia, probably the automation designer at Bosch had a bad day .... lol

Question Influence of room temperature on a scale of 1 to 10 and correction of room temperature on a scale of 0 to 10k.

The influence of room temperature, i.e. RA (Raumaufschaltung) gently shifts the heating curve that is already set on the weather-compensated control unit if the room temperature deviates from the setpoint.
This parameter should not be interpreted as the temperature value in K, i.e. in degrees - it is only a factor in the controller. 1 is OK and it's better not to change it.
Correction is a correction of the room sensor command. To set it correctly you need to have an accurate and checked electronic temperature meter