ᐅ Setting Up Gas Condensing Boiler Junkers Cerapurmodul ZBS 14

Can no one help further?

Why don’t you contact the company that installed it? They should be able to explain and adjust it for you. Once they have done that, the problem should be resolved.

Did you remove the drop?

Nordlys schrieb:
Why don’t you call the company that installed it? They should be able to explain and adjust it for you. Once they’ve done that, problem solved.

At the beginning, they set up the heating so it was comfortably warm and that was it. Now I want to optimize it for energy consumption, but of course, I will involve them again.

I also disabled the setback for 4 days without any improvement; on the contrary.

Now I have set it to automatic, meaning no foot or end point adjustments, just controlled by the outdoor temperature.

Let’s see what happens.

I’m struggling with this too...

I have a Vaillant gas boiler (VC 156/5-7) without solar support.
We have a pretty high gas consumption for a new build (23,000 kWh in the first year for about 190 m² (2,045 sq ft), built in 2017 according to the energy saving regulations with controlled residential ventilation and heat recovery, room temperatures around 22°C (72°F), 2 persons).

Also, since moving in, I have been discussing with the heating technician and electrician because the hot water circulation pump only runs at low outdoor temperatures. But then it runs constantly. When it’s warm outside, it doesn’t run at all.
The heating technician says it must be incorrectly connected, while the electrician checked and claimed everything was fine.

Since I wasn’t getting anywhere with them, I took matters into my own hands:

First, I found out our heating curve was set to 1.2. I’m now experimenting with it; the day before yesterday I started at 0.35 and 20°C (68°F), and right now I’m at 0.40 and 21°C (70°F).

Next, I disassembled the boiler to check the wiring on the control board.
Initially, I was interested in the Vaillant internet gateway but didn’t order it because of the price.
Now that I opened the boiler, the first thing I noticed was the gateway is already factory-installed! :O
It needs to be connected to the heating bus (E-Bus), power supply, and internet.
My electrician connected it to the bus but didn’t plug in the power supply, and there was no network cable either.
After I did that myself, the gateway started working. Incredible.

In the process, I also checked the circulation pump, and of course, I discovered it was not correctly connected, even though the electrician claimed twice that it was.
After switching it to the correct connector, the pump finally works properly.
You’d think an electrician should be able to read a wiring diagram correctly...

Long story short:

If your heating technician has set it up like this, don’t expect them to come back and set everything up properly.
They should have done that the first time if they knew what they were doing...

Just experiment yourself; it’s really not rocket science.
Turn all room thermostats to full heat (mine is 24°C (75°F)), lower the heating curve slope, and see if you reach the target temperatures. If not, gradually increase it and adjust the setpoint level.

Here’s the rule of thumb:

• If the room temperature is generally too low: increase the level
• If the room temperature is particularly too low on cold days: increase the slope
• If the room temperature is too low during transitional seasons but sufficient on cold days: increase the level and decrease the slope
• If the room temperature is too high during transitional seasons but sufficient on cold days: decrease the level and increase the slope

This is how I am approaching the whole thing now.
I created an Excel spreadsheet where I document several values every two hours during the day (setpoint/actual temperature of 4 rooms + 2 bathrooms, outdoor temperature, etc.).
This way, you can better track when it didn’t work well and adjust the slope or level of the heating curve accordingly.

Good luck with it.

I have been using an Excel sheet since the beginning of January. However, I can only record the data once in the evening.

What I cannot do is turn all the thermostats fully up in every room. In the bathroom, it is set to the maximum (level 6).