ᐅ Integrated unit Stiebel Eltron LWZ 504 with central supply air system
Created on: 19 Oct 2014 20:20
D
DJCOON
Hello dear forum members,
Through a variety of professional magazines I ordered for our new build in spring 2015, I came across the air-to-water heat pump LWZ 504 from Stibel Eltron. According to Stibel, this unit offers the following:
"The compact LWZ 504 provides all the comfort expected from an energy-efficient house. The system draws energy for pleasant indoor temperatures and hot water from the outside air. Modern ventilation management ensures that the heat stays inside the building. It recovers up to 90% of the heat from the exhaust air. This allows a comfortable, healthy atmosphere to be combined with high efficiency. The demand-controlled inverter technology also ensures high efficiency. It produces exactly the amount of heat currently needed. High performance values can be achieved even at low temperatures. Energy-saving operation is supported by the modern high-efficiency heating circulation pump and excellent insulation of the hot water storage tank. For those who want to be even more independent from rising energy costs, the LWZ 504 can be operated with self-generated photovoltaic electricity using the appropriate accessories (ISG + SEE). The large, intuitive matrix display ensures that the modern technology in the award-winning design is easy to operate."
Key Features
I understand that this great system naturally comes at a price, but I would like to ask the experts among you—air-to-water heat pump owners as well as heating engineers—for advice or experience with such units. Ideally, it would be great if someone already has this exact pump installed in their basement :-)
Thank you in advance for your responses.
Best regards,
Martin
Through a variety of professional magazines I ordered for our new build in spring 2015, I came across the air-to-water heat pump LWZ 504 from Stibel Eltron. According to Stibel, this unit offers the following:
"The compact LWZ 504 provides all the comfort expected from an energy-efficient house. The system draws energy for pleasant indoor temperatures and hot water from the outside air. Modern ventilation management ensures that the heat stays inside the building. It recovers up to 90% of the heat from the exhaust air. This allows a comfortable, healthy atmosphere to be combined with high efficiency. The demand-controlled inverter technology also ensures high efficiency. It produces exactly the amount of heat currently needed. High performance values can be achieved even at low temperatures. Energy-saving operation is supported by the modern high-efficiency heating circulation pump and excellent insulation of the hot water storage tank. For those who want to be even more independent from rising energy costs, the LWZ 504 can be operated with self-generated photovoltaic electricity using the appropriate accessories (ISG + SEE). The large, intuitive matrix display ensures that the modern technology in the award-winning design is easy to operate."
Key Features
- Excellent suitability for new buildings
- Energy-saving inverter technology
- Ventilation with up to 90% heat recovery
- High domestic hot water comfort with well-insulated 235-liter (62 gallon) storage tank
- Compatible with solar systems
- Stable, sound-optimized housing construction
- Built-in high-efficiency heating circulation pump
I understand that this great system naturally comes at a price, but I would like to ask the experts among you—air-to-water heat pump owners as well as heating engineers—for advice or experience with such units. Ideally, it would be great if someone already has this exact pump installed in their basement :-)
Thank you in advance for your responses.
Best regards,
Martin
haydee schrieb:
Still does not explain the noise levelIt could, though, if the filter causes more resistance, the system might increase power.ares83 schrieb:
It could, if the filter causes more effort, the system increases the output. It hasn’t made a noticeable difference for us. We don’t have the 504 model, but the 604. The filters are the same, and it’s worth trying.
A
A. Rösner6 May 2019 00:44According to the HVAC technician, the filters are installed correctly. He also removed and vacuumed them and explained to me that under no circumstances should they be reversed; after cleaning, they must always be reinstalled with the same side facing up. We have also placed markers on the system to indicate which side should be on top. I have now slightly lowered the domestic hot water temperature to 45 degrees Celsius (113°F). However, this does not affect the ventilation.
I still need to look more closely at the temperatures (floor level, incline, etc.)… it usually takes 2-3 days to notice any real changes.
Overall, I currently consider the entire system to be a complete design failure—the nightmare of owning your own home. Our only option at the moment is to run the heating and ventilation only when we are not at home, but that cannot be a long-term solution. I will get back to you once I have a statement from the installing plumbing company.
Best regards,
A. Rösner
I still need to look more closely at the temperatures (floor level, incline, etc.)… it usually takes 2-3 days to notice any real changes.
Overall, I currently consider the entire system to be a complete design failure—the nightmare of owning your own home. Our only option at the moment is to run the heating and ventilation only when we are not at home, but that cannot be a long-term solution. I will get back to you once I have a statement from the installing plumbing company.
Best regards,
A. Rösner
A. Rösner schrieb:
They are set up here as follows (all are supply air values; exhaust air is each time 20-30m³/h (12-18 cfm) higher):
Level 1: 120m³/h (70 cfm) (intended for nighttime operation)
Level 2: 220m³/h (130 cfm) (intended for daytime operation)
Level 3: 250m³/h (147 cfm) (party level) What is the size of the living area, and how high are the ceilings?
Assuming the required airflow was calculated correctly, in my opinion, the system is unsuitable.
According to the datasheet, the nominal airflow is designed for 240m² (2,583 sq ft) and maximum for 300m² (3,229 sq ft). The general rule of thumb is to operate at a maximum of 50% load, because above that, the system becomes excessively noisy and consumes more power. Unfortunately, no corresponding chart is available that shows this ratio, as some other manufacturers publish.
Based on these values, I believe the integrated ventilation system is suitable for up to 150m² (1,615 sq ft) of ventilated area, assuming standard ceiling heights and an air exchange rate of 0.4/h (nominal ventilation).
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