ᐅ Setting the Heating System Correctly

Hello,

this is the first winter in my newly built house,
so I am starting to optimize the heating system.

I have installed the Buderus Logaplus package W22
GB172-14, G20, WU160W, RC300 package with an outdoor temperature sensor.
The house is completely equipped with underfloor heating with 10cm (4 inches) pipe spacing, triple-glazed windows, exterior walls consisting of 24cm (9.5 inches) Poroton bricks plus 16cm (6 inches) external thermal insulation composite system (ETICS).

Now my question is how to best set up the heating system, unfortunately I did not receive any instruction from my heating engineer.

Let me first give you some data.

Maximum flow temperature: 50°C (122°F)
Heating setpoint: 22°C (72°F)
Lowering temperature: heating off
Summer mode from 13°C (55°F)
Domestic hot water: 55°C (131°F)
Circulation pump switching frequency: 3/hour
Burner starts: 5247 (since mid-February)
Burner runtime: 2387 hours (since mid-February)

Service menu:

Menu 1:
1.7d. 0: no external flow temperature sensor connected

Menu 2:
2.1A: 14 kW
2.1B: 15 kW
2.1C: 2: Constant pressure 200 mbar
2.1E: 4: Intelligent heating pump shutdown...
2.1F: 0: Heating pump and 3-way valve (internal)
2.3b: Time interval between burner switch-off and switch-on 10 minutes
2.3C: Temperature interval for burner switch-off and switch-on 6 K
2.3F: Hot water keep-warm duration 1 minute
2.9F: Heating pump post-run time 3 minutes
2.CE: Number of starts of circulation pump 3 min on, 17 min off

Menu 3:
3.1A: 14 kW maximum heating output
3.1B: 15 kW maximum domestic hot water output
3.2b: 50°C (122°F) maximum flow temperature
3.3d: 3.2 kW minimum nominal heat output

These are the details I know, I hope I didn’t overwhelm you too much.

I would appreciate any advice.

Thank you very much

I would call the plumber and ask him to please adjust the device... sorry, speaking from experience!

What I notice is hot water at 55 degrees Celsius (131°F)? That does not kill Legionella, and I don’t want to bathe in water that warm. So, reduce it to a maximum of 45 degrees Celsius (113°F); that’s enough.

Then heating at 22 degrees Celsius (72°F) — what does that mean? Where is it measured?

I have set every thermostat in the rooms to about 23-24 degrees Celsius (73-75°F) and adjust the temperature directly at the heat pump to the current 23 degrees Celsius (73°F) because we have a baby. Otherwise, I would set it directly to 21 degrees Celsius (70°F).
Adjusting takes 1-2 days due to the system’s inertia.

I forgot to mention that there is an RTH in every room.

I assume 22 degrees Celsius (72°F) is the desired temperature. I think it adjusts the flow temperature based on the outdoor temperature sensor.

I would like to call the heating company, but we had some disagreements towards the end, so I’m not eager to contact them.

tomtom79 schrieb:
What I notice is hot water at 55 degrees? That doesn’t kill legionella, and I don’t want to bathe in 55-degree water, so reduce it to a maximum of 45 degrees, that’s enough.

Of course, the water is then mixed down to the desired temperature.
However, I still find 55 degrees for an air-to-water heat pump quite high; it is likely a waste of energy or may not even be reached due to the temperature difference (and possibly triggers the electric heating element).

It was even set to 60 degrees beforehand, but I read that legionella bacteria are only killed at temperatures above 55 degrees.