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The honeywell prestige, like most other thermostats has the arangement below. When the R / Rc connection link is removed, can R & W be considered an isolated contact? Ie, if I allready power the stat from C and Rc with one transformer, I would asume there is no need to worry about R & W getting any juice from C or Rc correct? I wish these things were like Tekmar where you put 24 volts in to light it up but then have a completely seperate relay to do with what you want.
C ------O COMMON A/C X FORMER
R ------O POWER HEATING
Rc ------O POWER COOLING
W -------O HEAT
Y -------O COOL
G -------O FAN RELAY