Installation of Honeywell RTH8500 thermostat - Wiring

snakedjip · 2007-07-20T17:30:28+00:00

Hi,I currently have a Robertshaw 300-208 thermostat running my Luxaireheat-pump and (some other brand) electric furnace as auxiliary heat.I just bought the Honeywell RTH8500 thermostat to replace it.There are two labels on the Robertshaw thermostat which do notcorrespond to any label referred by the installation manual for theHoneywell thermostat : "24V" and "24V(c)".I've included pictures of the current wiring. Because some of thelabels are hidden in the pictures, here's a top-to-bottom list:W1Y1GR24V24V(c)OBHere are the pictures:Can anyone tell me which of my wires I should connect to whichterminal on the Honeywell ?Thanks.

Jul 20, 2007 21 Replies

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bud-- 19 years ago

Still no explanation of the error in my 2nd post.

Still no useful information for the OP.

Still a troll

-- bud--

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bud-- 19 years ago

Lost in the noise.

It is likely that Robertshaw 24(c) - blue wire - would connect to Honeywell C. (If Honeywell had a functional description of the terminals, as Robertshaw does, it would be clear.)

As trader describes it, this is a very useful feature.

-- bud--

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