If you put a three wire stat on a two wire system, what makes you think "fan
set to auto" will do any good?
Christopher A. Young
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I have a old two wire furnace system with a Honeywell T87F1818 3. Can I
replace it with a Honeywell T87F1800 3. And just keep to unit set to heat
and not cool and the fan set to auto?
On Thu, 24 Jan 2013 15:16:47 -0800 (PST), email@example.com wrote:
it with a Honeywell T87F1800 3. And just keep to unit set to heat and not cool
and the fan set to auto?
It should work fine. Also take a look at the back of the thermostat
and see if there is three screws, if so loosen the screws and the sub
base will come off and the front art of the thermostat will be like
the one that you are relacing.
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