ᐅ Setting Up Gas Condensing Boiler Junkers Cerapurmodul ZBS 14

Hello everyone,

we need your help or advice again. After living in the house for about 2 months and starting to familiarize myself with the heating system, I noticed that the boiler cycles very frequently, and I can’t really get it under control.

A brief overview of the conditions: we have about 150m2 (1,615 ft2) heated by underfloor heating connected to a "Junkers Cerapurmodul zbs 14/100 s3 ma 23" boiler.

I have set the base point at 27°C (81°F) and the return point at 46°C (115°F). The thermostat in the living room is set to level 4 out of 6, and the temperature is around 21°C (70°F)—not overly warm, but comfortably cozy (occasionally we use the fireplace).

Now, regarding the issue: we have about 100 to 150 burner starts per day. I’ve read from others that they only have about 5 to 10. What could be wrong here? By the way, we have experienced outdoor temperatures ranging from +5°C to -10°C (41°F to 14°F) in the last 4 weeks.

Try disabling the nighttime setback. With FHZ systems, it’s nonsense and causes erratic behavior because it’s too slow to handle that.

We only have the hot water set to 45°C (113°F), not 60°C (140°F). I’m not concerned about legionella, and a large part of the heating system turning on is because it tries to keep the water at 60°C (140°F). For the rest, you should ask the person who installed it. I think you confused the system.

I have switched to continuous operation and will monitor it throughout this week.

However, I will not let the domestic hot water temperature drop below 60°C (140°F).

Set the mode to Auto instead of Heating.

Min temp -20°C (−4°F)
And instead of Foot Point/End Point, select the Underfloor Heating mode

Honestly, I don’t know where I quickly set the heating mode.

Also, I would like to know where I can set the underfloor heating mode.

Thank you

Our system is always humming quietly in the background. K