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Posted by Harold hydronicnetwork.net on January 16, 2004 at 07:20:14:
In Reply to: Re: oil control relay posted by george on January 16, 2004 at 03:53:43:
If you short the TT terminals be sure to take the thermostat wires off so you don't 'bounce' the voltage and harm the thermostat. Yes, a thermostat is a 'jumper' that closes a set of contacts, much like putting a wire across TT.
FF is for the flame detector (cad cell) usually yellow wires into the burner to 'see' the flame.