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Fri Oct 9 19:15:57 EDT 2015

Thermostat connector

B  black wire
O
G
Y  
W  yellow wire
-  not used
R  \
RC /


R and RC are bridged.
60Hz, 27V between B and Y.

B is 24V "neutral"

This is a 2-wire system from an old mercury thermostat.
Connecting black and yellow gives about 0.1A current.


https://wiki.xtronics.com/index.php/Thermostat_signals_and_wiring
https://www.youtube.com/watch?v=CLBPsdATeZg


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