There are dip switches on the Uni match feeder that change the dwell and feed times. Also this feeder comes with orifices that control rate of flow through it. There are 3 sizes of rubber discs meant… (View Post)
Rollout and draft switch generally not seen until late 80s. See this a lot. If I replace a gas valve on pre-safety switch unit I add both to burner circuit as a rule. There is some scary antique gas … (View Post)
Just saw the Vitocrossal in the viessman truck. Pretty sure the model is brand new this year. Nice boiler. All set up to pipe like a conventional boiler with no added exterior pri/sec. Easy burner cl… (View Post)
Black iron bypass energized with fresh water between backflow and pressure redux valve should be copper. Wonder what the logic on the backflow relief air gap is. As mentioned black iron out of relief… (View Post)