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Posted by Dave on January 22, 2006 at 11:18:17:
In Reply to: a few minor problems after our repiping posted by Dave on January 22, 2006 at 08:57:18:
After I posted the first post, I went around the house and checked all the zones. The attic air handler had been off for over an hour and the pipes were hot.
So it seems like we're getting flow through all the zones even when the individual zone pumps are not on.
Each zone has a separate flowcheck valve just beyond the pump, but there are no checks in individual returns. I then went to the basement and touched the pipes for the attic air handler. The supply pipe is hotter than the return. So it seems to me like water is moving through the pumps in a forward flow even when the pumps are off.
Our ergomax circuit is as follows. The 001 pumps water from the bottom of the tank into the boiler inlet The pipe is all 2" copper except where it goes through the pump and also where it tees with the return header pipe from the house about 6" from the bottom of the tank.
The water coming out of the boiler flows through 2" pipe and then through a 2" swingcheck before coming up to the top of the tank and teeing with the supply header pipe (1.5") (about 8" from tank inlet). Then the 1.5 " pipe continues to another tee at the actual inlet of the tank where we have an air removal device.
The supply manifold pipe (also 1.5") travels vertically and about 2 feet up the makepwater is piped into it.
The supply pipe then turns 90 degrees and runs horizontally across ceiling. About a fott after that 90 degree bend is the Spirovent with the expansion tank on the bottom. then the supply pie continues past each zone pump before deadending.
The return manifold piping is exactly as before the repipe work.
Do you have any ideas why all zones remain hot even when pumps are not running?
Thanks.
Dave