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Posted by Craig M on October 29, 2008, 10:21 am
Check out this website, you may find a answer there in the forurm
http://www.hvacmechanic.com/
check it out, worth a shot
> Basic homeowner question here so be gentle...
> I'm replacing the old murcury thermostat with a programmable digital to
> hopefully same some $$ on oil. It is a very basic system - oil fired
> boiler with baseboard heat; one zone; no A/C; no fans etc. The old (and I
> mean old) wiring is two wires, white & black. From what I can gather, one
> wire goes to the Rh terminal for "Heating power supply and one wire
> connects to W terminal for "Heating Signal". Questions is, does it matter
> which wire goes to which terminal?? The old thermostat has no markings in
> regards to what the wires or terminals represent so I can't copycat the
> instillation. My gut says white wire to Rh for power and black to W but
> I'd prefer not to have my gut destroy my $5000 boiler.
>
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> I'm replacing the old murcury thermostat with a programmable digital to
> hopefully same some $$ on oil. It is a very basic system - oil fired
> boiler with baseboard heat; one zone; no A/C; no fans etc. The old (and I
> mean old) wiring is two wires, white & black. From what I can gather, one
> wire goes to the Rh terminal for "Heating power supply and one wire
> connects to W terminal for "Heating Signal". Questions is, does it matter
> which wire goes to which terminal?? The old thermostat has no markings in
> regards to what the wires or terminals represent so I can't copycat the
> instillation. My gut says white wire to Rh for power and black to W but
> I'd prefer not to have my gut destroy my $5000 boiler.
>