Keystoker.Do I Need a Check Flow Vavle?

by posting those pictures, you tell me you still don't understand what you or your plumber did when you incorrectly connected to the existing system

The pictures you post are all fine and good - maybe even nice work - if the far boiler connections were not so wrong

In the world I live in - sorry to report
there is no one quick fix to make this right
Pumping that near boiler piping around the coal boiler only sets up a propitiatory loop that simply moves energy in that loop- The energy has no reason to move out of it - only a marginal amount will ever escape to the load. Further - simply shutting off that incorrect pump will not fix the problem because the near piping of the coal boiler is too small.

If there was a valve on the supply side of the coal boiler you might experiment with choking that GPM and maybe that could reestablish a gravity flow to the load

Maybe but then you run other risks - no don't do that...

Any update on this problem yet?

I'm not a boiler tech. I think you need the check valve to stop the cool water from flowing back into the boiler after the stat was satisfied. This would cause the boiler to fire again because of the low setting. Yes I think you need it unless you have two zones.

My ka6 is set up for buck wheat coal. The red nut is adjusted for the coal you use. My small fan is max open with 3 " outside air piping. My timer is one pin @ 0 10 20. My aquastat is 190 high 140 low dif 20. I have a new chimney two stories high. And my bypass stat is at 210.

If you get the plumbing correct the Keystoker will work.

Sting wrote:by posting those pictures, you tell me you still don't understand what you or your plumber did when you incorrectly connected to the existing system

The pictures you post are all fine and good - maybe even nice work - if the far boiler connections were not so wrong

In the world I live in - sorry to report
there is no one quick fix to make this right
Pumping that near boiler piping around the coal boiler only sets up a propitiatory loop that simply moves energy in that loop- The energy has no reason to move out of it - only a marginal amount will ever escape to the load. Further - simply shutting off that incorrect pump will not fix the problem because the near piping of the coal boiler is too small.

If there was a valve on the supply side of the coal boiler you might experiment with choking that GPM and maybe that could reestablish a gravity flow to the load

Maybe but then you run other risks - no don't do that...

You can say that again Sting. I don't see an expansion tank.......the vent pipe upstairs is probably still open , probably limit discs in the rad. valves..........etc. etc. etc.