Re: Are Sierra thermostats OK?

[amuller]

The last post I wrote disappeared, which happens about 25% of the time on this board. I must be doing something wrong. It wasn’t valuable enough to do over, but I do have another thought:

If part of the flow control action is that the poppet bears on the inside of the cover plate when the stat opens, it makes sense that the stat would have, and need, a poppet spring-loaded onto the spindle. I don’t believe the Sierra SS state I put in has that feature. Unless there is equivalent flexibility built into the stat in some other way, it seems to me that the new Sierra state is not equivalent to the original in two ways: (1) lack of a slot in the poppet, and (2) lack of spring loading of same.