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Posted by Stan on January 31, 2012 at 07:55:22:
Hello;
I'm running an early sixties Homart cast iron boiler w/ tankless coil.
The "Triple Hot Water Control", model # 541.9166 is wired; the left hand switch controlling the circulator, only, the right hand switch controlling the burner.
I understand that the right hand switch is a High Limit switch and is supposed to be a safety, to prevent a burner runaway.
The LH switch is a double throw switch. Should I wire it in series with the high limit switch? If
I do that, how should the Adjustable Differential be set?
Reason I'm asking is that the burner short cycles because the RH switch's trip points are so close with no adjustable hysteresis.
The wiring / adjustment card is missing from the cover, have only the single sheet with specifications.
Question, does the Differential adjustment offset the low point, or the high?
Thanks for any help, especially a pointer to a correct wiring diagram and setup info.
Stan