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Check Valve Noise: Do I even need it ?
Now that my Viessmann has been up and running with all the radiant connected -- only noise heard is a slight in line check valve rattle on the secondary loop pump. The top one above the LLH. The system uses two pumps -- two identical Alpha II (the smaller size). Don't have the water to the building connected yet -- so the loop for the DHW is not operational (3 speed pump). These are the small valves that come with the pumps
Why would it be making noise and do I even need it ? How much ghost flow would I get w/o it? It's running with constant circulation and when the DHW would call the boiler loop pump to the LLH is off as well (with a cv) ?
The mechanical room is spaced challenged. Here is the system. Two of the four manifolds are in there and it shares the space with the generator control and all the electrical panels. This room is within the living space next to a bathroom .... I'm not sure anyone but me will ever even hear it.
I currently have both pumps on "auto" and the boiler loop seems to settle around 3/4 GPM .... the other pump is normally "HI". I have tried different settings for both (the picture shows it in III) .... the system pump needs to be in auto or III to keep the flow up.
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