There are two swing settings on the W-R, jumper selectable. As per
their instructions I have the setting at 1.7 degrees for baseboard.
(For hot air they recommmend 1.)
The heat anticipator is not continuously variable but is jumper
selectable. It is currently set to anticipate.
My GF has been instructed to note carefully when a gross overshoot
next occurs, to note the thermostat readings, and to check to see if
the circulator is running. When she next logs this, I will report
back.




On Sat, 7 Apr 2012 06:44:54 -0700 (PDT), "
wrote:

On Apr 6, 8:57*pm, frank1492 wrote:
Followup note: The burner and the circulator turned on tonight when
the temp and setpoint in the room were the same. After the burner shut
off the circulator continued to run by 3-5 minutes. The actual temp
was then *one degree above the setpoint.
* * *So far I have never seen the burner run without the circulator,
but there may not be enough observations. Will continue to post
periodically. If this were true all the time we would have something.
* * *Comments welcome. (Thanks.)


If it worked as you describe all the time, I'd say that
the heat anticipator setting on the thermostat could
be the problem. The thermostat turned on when
the temp shown was the same as the setpoint.
Internally the thermostat likely knows the temp is
actually 1/2 deg or so lower and so it calls for heat.

IT shuts off when the temp has risen enough, to
say setpoint plus some margin. Then the carryover
heat continues raising the temp and the thermostat
now shows the setpoint +1 deg. Adjusting the
heat anticipator or swing setting in the thermostat
could reduce the upswing.

Bottom line, the above sounds like a system that
is working, but could use adjustment. It's very
different than the other reports of the system
continuing to run and taking the room temp 5
degs above the setpoint. If those huge overshoots
are still occuring, and have occured with 2
thermostats, then you have a problem and it's not
the thermostat or thermostat adjustment.