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I have an old two...black/red thermostat wire. Which slot does the black wire go I on the rth6450

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Two wire systems are usually heat only systems. If yours is a heat only system, it will not matter which color goes on a certain terminal, just as long as one goes to RH and one goes to W.

Posted on Dec 08, 2013

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SOURCE: My we Honeywell RTH6450 thermostat does not have

Here's the colour of wires someone else used

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Posted on Nov 26, 2013

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Hook up the red wire to Rh (or Rc if they are jumped together) amd the white wire on W.

For thermostat terminal designation
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Hi, this can be confusing. Be sure you have the power off before you wire it, but first you have to have an elect meter. The 6 wires in the box you will only use 2 of them. Cap the other 4 off. Use the 2 that have the correct voltage across them, 208, 220, 240 volts. The new stat is only set up for 2 hot wires 120 each. That will do it. Not to bad. be careful! Use care. Good Luck, Sincerely,
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red goes to RC and RH, White goes to W, Green goes to G and Blue goes to Y. iam assuming on the old tstat that Red whent to R White went to W Green went to G and Blue went to Y

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From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.

Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.

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