I recently had a L7224U Aquastat (Honeywell's replacement for L8124)installed on a Weil-Mclean Oil Burner. I have had some difficulty in setting the proper temperature limits. This boiler provides space heat as well as Domestic Hot Water. The boiler manufacturer reccomends the following settings:
High Limit = 200 F
Low Limit = 190 F
High Limit Differential = 15 F
Low Limit Differential = 10 F
With these settings, the circulator control does not seem to operate properly as there is a lot of jitter in the control (burner comes on and off with very small changes in temperatures, every 1-3 seconds).
The tech sheet states that "setting the Low Limit less than the High Differential below the High Limit *is not allowed* as improper circulator and Zone Control functions could result". I beleive the Boiler Manufacturer's reccomendation cause this state to exist.
Has anyone had experience with this particular controller. It does not seem that the old L8124 settings trasfer directly.
I don't think there is anything wrong with the controller, or the temp probe, its just a matter of setting the correct limits.