Philtrap
Member
Hope all is well with you guys... I have a quick question...
Here's the deal. See photo for piping set up... Ignore the closely spaced tees and the buffer tank since they're not the problem.
What happens is when the call for heat goes off the zone valve turns off, but the two pumps stay on (system pump and zone circulator) for a little while. Right when the zone valve shuts off there is a banging noise. I'm thinking there it may be one of these two problems:
1) The Diff Bypass valve may need to be adjusted (I did follow the installation instructions when it was installed by waiting for the outflow side to get hot and finding the tipping point). or,
2) the SC pump shown in the diagram should shut off when the call for heat goes off. This may be programed in the boiler...
Any help would be greatly appreciated.
Thanks,
Here's the deal. See photo for piping set up... Ignore the closely spaced tees and the buffer tank since they're not the problem.
What happens is when the call for heat goes off the zone valve turns off, but the two pumps stay on (system pump and zone circulator) for a little while. Right when the zone valve shuts off there is a banging noise. I'm thinking there it may be one of these two problems:
1) The Diff Bypass valve may need to be adjusted (I did follow the installation instructions when it was installed by waiting for the outflow side to get hot and finding the tipping point). or,
2) the SC pump shown in the diagram should shut off when the call for heat goes off. This may be programed in the boiler...
Any help would be greatly appreciated.
Thanks,