DIYbanter - View Single Post - Programmable Thermostat wiring question -rth7500

wrote:
Travis,
Thank you, sir. It appears to be working and the house is still
standing :-)

I do have a question...when a terminal is designated "Y6," is that
terminal "Y" or "6" or is it considered a specific "Y6" value? Just
curious.

Glad to hear all is OK, Dave.

I can't see your thermostat from here, but on the WR instruction sheet the
terminals are just labeled 4, 5, and 6. So let's assume your WR thermostat
labels mean "Y" and "6".

The "Y" terminal is classically used to enable the compressor (cooling)
circuit. In the case of the Honeywell thermostat it is also the 'call for
heat satisfied' side of the SPDT relay, which is why it works in your
application.

Travis