ᐅ Wolf ventilation system CWL-2 325 insufficient airflow amount
Created on: 3 Sep 2024 21:59
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ParadiddelP
Paradiddel3 Sep 2024 21:59Good evening,
a ventilation system from the company Wolf, model CWL-2 325, was installed in our new build.
We moved into the house in June 2024 and are disappointed with the performance of the ventilation system.
The company that installed the ventilation system visited again and found that less air was reaching the rooms than was set. Although the system was set to deliver 160 m³/h (94 CFM), only about 120 m³/h (71 CFM) actually reaches the rooms.
In some rooms, only about 7 m³/h (4 CFM) arrives, even though 20 m³/h (12 CFM) is specified in the ventilation plan.
The company could not really help us and referred us and our general contractor to Wolf.
We face the risk that if this is not a warranty case, we will have to cover the service visit costs ourselves. The basic service charge at Wolf alone is almost €500, plus hourly rates and so on.
It is unclear to us whether the cause of the missing airflow lies with the ventilation unit itself or with the duct system to the rooms. In the latter case, it would not be a warranty issue for Wolf.
We are uncertain how to proceed.
We also noticed something else about the ventilation system that does not seem quite right.
At an outdoor temperature of 13.7°C (56.7°F) at 7:30 in the morning, the supply air temperature was 22.6°C (72.7°F), and the exhaust air temperature was 14.9°C (58.8°F). Could the supply and exhaust air temperatures have been swapped? The bypass was open.
If so, this would definitely be a warranty case, and Wolf would not come out for no reason.
a ventilation system from the company Wolf, model CWL-2 325, was installed in our new build.
We moved into the house in June 2024 and are disappointed with the performance of the ventilation system.
The company that installed the ventilation system visited again and found that less air was reaching the rooms than was set. Although the system was set to deliver 160 m³/h (94 CFM), only about 120 m³/h (71 CFM) actually reaches the rooms.
In some rooms, only about 7 m³/h (4 CFM) arrives, even though 20 m³/h (12 CFM) is specified in the ventilation plan.
The company could not really help us and referred us and our general contractor to Wolf.
We face the risk that if this is not a warranty case, we will have to cover the service visit costs ourselves. The basic service charge at Wolf alone is almost €500, plus hourly rates and so on.
It is unclear to us whether the cause of the missing airflow lies with the ventilation unit itself or with the duct system to the rooms. In the latter case, it would not be a warranty issue for Wolf.
We are uncertain how to proceed.
We also noticed something else about the ventilation system that does not seem quite right.
At an outdoor temperature of 13.7°C (56.7°F) at 7:30 in the morning, the supply air temperature was 22.6°C (72.7°F), and the exhaust air temperature was 14.9°C (58.8°F). Could the supply and exhaust air temperatures have been swapped? The bypass was open.
If so, this would definitely be a warranty case, and Wolf would not come out for no reason.
R
RotorMotor4 Sep 2024 10:01Could the airflow simply be a measurement inaccuracy?
Otherwise, check/measure at the manifold.
Why are you referring to the manufacturer?
The contractual partner is the general contractor, right?!
Are you sure the bypass was open?
The readings don’t seem to indicate that.
Otherwise, check/measure at the manifold.
Why are you referring to the manufacturer?
The contractual partner is the general contractor, right?!
Are you sure the bypass was open?
The readings don’t seem to indicate that.
P
Paradiddel4 Sep 2024 15:26Hello,
The company that installed the system informed us that the 40m3/h (24 cfm) are missing after they took measurements with a suitable device. Measuring directly at the distribution manifold is a good idea, but then we would need such a measuring device again.
We have already contacted the general contractor, but they refer to the information from the company that installed the system, stating that it is operating without faults. The system doesn’t have any obvious defect; it just has such a low effect, which was confirmed by the measurements.
I believe the bypass was open; it was actually open the whole summer when I checked. Attached are photos from another day when the bypass was definitely open. What measurement values would be typical for an open bypass?
Thanks!
The company that installed the system informed us that the 40m3/h (24 cfm) are missing after they took measurements with a suitable device. Measuring directly at the distribution manifold is a good idea, but then we would need such a measuring device again.
We have already contacted the general contractor, but they refer to the information from the company that installed the system, stating that it is operating without faults. The system doesn’t have any obvious defect; it just has such a low effect, which was confirmed by the measurements.
I believe the bypass was open; it was actually open the whole summer when I checked. Attached are photos from another day when the bypass was definitely open. What measurement values would be typical for an open bypass?
Thanks!
Do you have a CWL-2 325 in the left- or right-handed version? We received the wrong version, so the supply and exhaust air connections were swapped. I noticed this before the final acceptance. The specialist company installed it exactly according to the plan but did not check its functionality. They wouldn’t have noticed the mistake otherwise.
I have the left-handed version (identifiable by the "L").
From the manual:
Regarding temperatures:
When the bypass is open (i.e., no heat exchanger), the supply air temperature is almost exactly the indicated outside temperature.
When the bypass is closed (heat exchanger active), the exhaust air temperature is close to the outside temperature.
I have the left-handed version (identifiable by the "L").
From the manual:
Regarding temperatures:
When the bypass is open (i.e., no heat exchanger), the supply air temperature is almost exactly the indicated outside temperature.
When the bypass is closed (heat exchanger active), the exhaust air temperature is close to the outside temperature.
P
Paradiddel5 Sep 2024 21:19Hello Sysrun80,
Great, that was my big hope—to find someone here with the same device 🙂
I had already suspected the left and right versions when I looked at the manual.
We have the following unit:
CWL-2-325 4/0 L - LN, so the left version as well, and on the left side, the air continues into the individual rooms or back again. That should be correct.
Very interesting about the temperatures.
What is your supply air temperature with the bypass closed? Is it also approximately the same as the exhaust air and outside air, or is it more like ours (with the bypass open) and higher?
Unfortunately, I won’t be home until the end of next week; otherwise, I would close the bypass right away and see what happens to the temperatures.
Great, that was my big hope—to find someone here with the same device 🙂
I had already suspected the left and right versions when I looked at the manual.
We have the following unit:
CWL-2-325 4/0 L - LN, so the left version as well, and on the left side, the air continues into the individual rooms or back again. That should be correct.
Very interesting about the temperatures.
What is your supply air temperature with the bypass closed? Is it also approximately the same as the exhaust air and outside air, or is it more like ours (with the bypass open) and higher?
Unfortunately, I won’t be home until the end of next week; otherwise, I would close the bypass right away and see what happens to the temperatures.
P
Paradiddel13 Sep 2024 21:56Good evening,
I have now also run the ventilation system with the bypass closed. The exhaust air temperature is around room temperature rather than outside air temperature; I have attached some pictures. It seems that something is not quite right with the device, if I am seeing this correctly.
I wonder if this could be the reason why the system has a lower airflow rate than expected, or if perhaps only the sensors are swapped?
I have now also run the ventilation system with the bypass closed. The exhaust air temperature is around room temperature rather than outside air temperature; I have attached some pictures. It seems that something is not quite right with the device, if I am seeing this correctly.
I wonder if this could be the reason why the system has a lower airflow rate than expected, or if perhaps only the sensors are swapped?
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