ᐅ Underfloor heating with an air-to-water heat pump. House gets too warm when the sun is shining.
Created on: 4 Dec 2019 14:18
C
chewbacca123
Hello everyone,
I have a general question.
We moved into our new build four months ago. The living area on the ground floor has three large floor-to-ceiling windows facing south. We have underfloor heating and an air-to-water heat pump.
It provides a really comfortable temperature inside the house, but we have a problem – whenever the sun is shining in winter, even if it’s -2°C (28°F) outside, the temperature suddenly rises to 24°C (75°F) in the living room. It gets uncomfortably warm in here, and the underfloor heating can’t be turned down quickly.
Should we assume that the large floor-to-ceiling windows are responsible for the heat gain? A photo of the south-facing side of the house is attached.
What would you do – always lower all the blinds as soon as sunlight is forecast? That seems quite annoying...
We have motorized blinds controlled by Somfy. Would you consider buying a sensor that automatically lowers the blinds at a certain temperature?
Thanks in advance for your replies.
I have a general question.
We moved into our new build four months ago. The living area on the ground floor has three large floor-to-ceiling windows facing south. We have underfloor heating and an air-to-water heat pump.
It provides a really comfortable temperature inside the house, but we have a problem – whenever the sun is shining in winter, even if it’s -2°C (28°F) outside, the temperature suddenly rises to 24°C (75°F) in the living room. It gets uncomfortably warm in here, and the underfloor heating can’t be turned down quickly.
Should we assume that the large floor-to-ceiling windows are responsible for the heat gain? A photo of the south-facing side of the house is attached.
What would you do – always lower all the blinds as soon as sunlight is forecast? That seems quite annoying...
We have motorized blinds controlled by Somfy. Would you consider buying a sensor that automatically lowers the blinds at a certain temperature?
Thanks in advance for your replies.
So, last night there was another disruption with defrost cycle 760. The whole house is getting cooler, losing about 1 degree.
Today, I switched the variable speed pump from automatic to manual. Now it runs at 1500 liters per hour instead of 800 liters per hour. This also doubles the flow rate in the bathroom.
I’m curious to see what will happen. Maybe the whole system will break down now.
I’ve read in another forum about pump voltage values—10 volts nominal and 3 volts effective. I don’t see anything like that on my system, and there is no option to adjust it.
It would be great if someone could check the menu to see what options they have under variable speed pump settings, or if you can find this voltage setting anywhere?
Today, I switched the variable speed pump from automatic to manual. Now it runs at 1500 liters per hour instead of 800 liters per hour. This also doubles the flow rate in the bathroom.
I’m curious to see what will happen. Maybe the whole system will break down now.
I’ve read in another forum about pump voltage values—10 volts nominal and 3 volts effective. I don’t see anything like that on my system, and there is no option to adjust it.
It would be great if someone could check the menu to see what options they have under variable speed pump settings, or if you can find this voltage setting anywhere?
A
Alessandro12 Jan 2021 09:46Which settings can you select on the pump?
Shouldn't it modulate directly along with the heat pump?
Shouldn't it modulate directly along with the heat pump?
Alessandro schrieb:
What settings can you choose on the pump?
Shouldn't it modulate automatically together with the heat pump? I can set it to automatic, so it modulates accordingly. But in my opinion, that doesn't work for me because the flow rates are too low.
That's why I have now set it to manual, with 100% max and 40% min.
halmi schrieb:
@Bookstar did you reduce many loops? What software version is your machine running?All loops are open. The software version is the latest, installed two weeks ago. I will upload a csv here.| 12.01.2021 | 10:12 |
| System status: | |
| Heat pump type | LWA 12 |
| Heat pump type | HDT_9 |
| Software version | V3.85.6 (r6445) |
| Bivalence stage | 1 |
| Operating mode | Heating |
| Actual power | 6.69 kW |
| Defrost requirement | 6.9% |
| Last defrost | |
| System settings: | |
| Utility lockout | without external heat source |
| Room sensor | No |
| Integration | Return line |
| Mixing circuit 1 | No |
| Fault | without external heat source |
| Domestic hot water 1 | Sensor |
| Domestic hot water 3 | without external control input |
| Domestic hot water 4 | Setpoint |
| Domestic hot water 5 | with external heating element |
| DHW + heat pump max | 0.0 h |
| Pump optimization | Yes |
| Access | Customer |
| Pressure monitoring | On |
| Heating circuit control | Outdoor reset |
| Mixing circuit 1 control | Outdoor reset |
| Boost heating | with mixing |
| Electric anode | No |
| Heating limit | Yes |
| Remote maintenance | Yes |
| Pump optimization time | 10 min |
| TDI message | Yes |
| Release external heat source | 60 min |
| DHW reheating | No |
| Max reheating DHW | 5.0 h |
| Smart Grid | No |
| Mixing circuit 1 control | fast |
| Compressor heating | Yes |
| Temperatures: | |
| Return limit | 45.0°C (113°F) |
| Hysteresis heating circuit | 1.5 K (2.7°F) |
| Hysteresis DHW | 5.0 K (9.0°F) |
| Max temperature difference TR | 7.0 K (12.6°F) |
| Release external heat source | -2.0°C (28°F) |
| TDI target temperature | 60.0°C (140°F) |
| Max outdoor temperature | 40.0°C (104°F) |
| Min outdoor temperature | -20.0°C (-4°F) |
| Setback up to | -20.0°C (-4°F) |
| Hysteresis mixing circuit | 2.0 K (3.6°F) |
| Max domestic hot water temperature | 60.0°C (140°F) |
| Min return setpoint temperature | 15.0°C (59°F) |
| Pump efficiency: | |
| Heat distribution system | Underfloor heating / radiant heating |
| Heating control | Manual |
| Nominal heating output | 100% |
| Minimum heating output | 60% |
| DHW control | Automatic |
| Cooling temperature difference | 5.0 K (9.0°F) |
| Additional heat source 1 | |
| Type | Heating element |
| Function | Heating and DHW |
| Position | Integrated |
| Output | Out 1 |
| Pump pre-run: | |
| Pump pre-run external control input | 60 s |
| Priorities: | |
| Domestic hot water | 1 |
| Heating | 2 |
| Swimming pool | 3 |
| System configuration: | |
| Heating | Yes |
| Domestic hot water | Yes |
| FlexConfig: | |
| OUT 2 | ZIP |
| OUT 3 | FP1 |
| Heating curves for heating | 27.5°C (81.5°F) |
| Operating hours information: | |
| Operating hours compressor 1 | 5689 h |
| Compressor 1 impulses | 6327 |
| Average runtime compressor 1 | 00:53 |
| Operating hours external heat source 1 | 100 h |
| Operating hours heat pump | 5689 h |
| Operating hours heating | 4867 h |
| Operating hours domestic hot water | 816 h |
| Temperature information: | |
| Flow temperature | 28.1°C (82.6°F) |
| Return temperature | 25.3°C (77.5°F) |
| Return temperature setpoint | 26.6°C (79.9°F) |
| Hot gas temperature | 62.3°C (144.1°F) |
| Outdoor temperature | -3.1°C (26.4°F) |
| Average temperature | -4.7°C (23.5°F) |
| Actual domestic hot water | 48.0°C (118.4°F) |
| Target domestic hot water | 48.0°C (118.4°F) |
| Heat source inlet | -2.6°C (27.3°F) |
| Max flow temperature | 60.0°C (140°F) |
| Compressor intake | -3.1°C (26.4°F) |
| Compressor heating | 51.3°C (124.3°F) |
| Superheat | 7.5 K (13.5°F) |
| Target superheat | 7.1 K (12.8°F) |
| Flow sensor 1 | 19.0°C (66.2°F) |
| Flow sensor 2 | 24.5°C (76.1°F) |
T
T_im_Norden12 Jan 2021 10:17Do I understand this correctly:
Heating system minimum output 60%?
Does that mean the minimum heating capacity is 60%?
If so, reduce it to 20% or something like that.
Heating system minimum output 60%?
Does that mean the minimum heating capacity is 60%?
If so, reduce it to 20% or something like that.
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