ᐅ Air-to-water heat pump combined with underfloor heating is not functioning properly
Created on: 22 Sep 2021 15:34
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_Ugeen_
Hello everyone,
We moved into our single-family house in the middle of the year and are now using our air-to-water heat pump (Daikin Altherma 3 R ECH2O) for the first time. In the rooms, we decided against the standard analog controllers and chose digital controllers instead. After several discussions with Daikin and the controller manufacturer, I now understand that a valve is only opened or closed when I want to increase the temperature or not.
With the Daikin system, I can set a target room temperature. According to Daikin, this target value does not represent the minimum temperature per room but rather the "preheating value," if I understand correctly. This value was previously set at 23°C (73°F).
In the bedroom, I set the digital controller so that heating only starts when the temperature drops below 18°C (64°F). Despite this setting, the room temperature has always been 22-23°C (72-73°F), although the digital controller shows that heating is off. After changing the target room temperature from 23 to 21°C (73 to 70°F), it got a bit cooler. However, in the bathroom, heating is supposed to activate below 23°C (73°F). The temperature there is 22°C (72°F), and the digital controller indicates that heating is active. Yet, the room does not get warmer, and the floor heating does not noticeably warm up either.
Conclusion: I still have not understood the logic behind the target room temperature setting. In our previous apartment, we also had underfloor heating with analog controllers that I could adjust higher or lower. That worked wonderfully, and I felt like I could control the temperature. Here, with the air-to-water heat pump, I don’t have that feeling. Also, the towel warmers do not get truly warm (only lukewarm), which Daikin says is normal even when the dial is set to 5. This is apparently because it is a low-temperature heat pump. Without the electric booster to warm the towel warmers, they are essentially ineffective. Is this normal? Could there be an error, or do I need to use completely different settings?
If anyone has experience with this topic, I would greatly appreciate your feedback. At the moment, I feel a bit lost on this subject.
We moved into our single-family house in the middle of the year and are now using our air-to-water heat pump (Daikin Altherma 3 R ECH2O) for the first time. In the rooms, we decided against the standard analog controllers and chose digital controllers instead. After several discussions with Daikin and the controller manufacturer, I now understand that a valve is only opened or closed when I want to increase the temperature or not.
With the Daikin system, I can set a target room temperature. According to Daikin, this target value does not represent the minimum temperature per room but rather the "preheating value," if I understand correctly. This value was previously set at 23°C (73°F).
In the bedroom, I set the digital controller so that heating only starts when the temperature drops below 18°C (64°F). Despite this setting, the room temperature has always been 22-23°C (72-73°F), although the digital controller shows that heating is off. After changing the target room temperature from 23 to 21°C (73 to 70°F), it got a bit cooler. However, in the bathroom, heating is supposed to activate below 23°C (73°F). The temperature there is 22°C (72°F), and the digital controller indicates that heating is active. Yet, the room does not get warmer, and the floor heating does not noticeably warm up either.
Conclusion: I still have not understood the logic behind the target room temperature setting. In our previous apartment, we also had underfloor heating with analog controllers that I could adjust higher or lower. That worked wonderfully, and I felt like I could control the temperature. Here, with the air-to-water heat pump, I don’t have that feeling. Also, the towel warmers do not get truly warm (only lukewarm), which Daikin says is normal even when the dial is set to 5. This is apparently because it is a low-temperature heat pump. Without the electric booster to warm the towel warmers, they are essentially ineffective. Is this normal? Could there be an error, or do I need to use completely different settings?
If anyone has experience with this topic, I would greatly appreciate your feedback. At the moment, I feel a bit lost on this subject.
R
RotorMotor8 Oct 2021 11:30Why is it so important to you to have one or more cooler rooms in the house?
A
Alessandro8 Oct 2021 11:33Snowy36 schrieb:
But a quick question: with which system does it cost me more money to run inefficiently?
I had the impression that increasing the supply temperature by 2 degrees or having a poorly adjusted setting for underfloor heating and an air-to-water heat pump causes higher costs than with gas? As a general rule, you can expect about a 2.5% increase in costs for each degree Celsius with the heat pump.
Electricity for the heat pump currently costs 21c/kWh.
RotorMotor schrieb:
Why is it so important for you to have one or more cooler rooms in the house?Well, I don’t want it to be 22 degrees in the bedroom. It also gets warm there very quickly due to the sun. In the office, 21 degrees is enough for me as well. I find anything above 23 degrees too warm at home, even though my wife probably feels differently.R
RotorMotor8 Oct 2021 11:35_Ugeen_ schrieb:
Well, I don’t want 22 degrees Celsius (72°F) in the bedroom. The sun also makes it warm quite quickly. 21 degrees Celsius (70°F) is enough for me in the office as well. I find anything above 23 degrees Celsius (73°F) too warm at home. Although my wife probably thinks differently. Then just set the whole house to 22 degrees Celsius (72°F) and the bedroom to 21 degrees Celsius (70°F).
That shouldn’t be a problem, right?
Oh, and is your bedroom on the sunny side?
In that case, it’s not really the heating’s fault...
RotorMotor schrieb:
Then just set the whole house to 22°C (72°F) and the bedroom to 21°C (70°F).
That shouldn’t be a problem, right?
Oh, is your bedroom on the sunny side?
In that case, the heating can’t really be blamed... Somehow the thermostats aren’t working very well. The thermostat in the bedroom is set to 18°C (64°F), but we still have 21-22°C (70-72°F). I would prefer it to be around 19-20°C (66-68°F).
The bedroom struggles with the afternoon sun. Even when the blinds are down in summer, it heats up quite quickly to a maximum of 25-26°C (77-79°F). I think in the long run we won’t be able to avoid installing an air conditioner. Honestly, I expected more from the cooling function of the air-to-water heat pump. That was actually the main reason for our purchase.
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