Have an older (80s) Lennox heat pump with the original thermostat with dual mercury bulbs. The Honeywell RTH3100C looks like it should work as a replacement, but the Lennox thermostat has terminals labelled V R F M L A Y and X. The Honeywell manual doesn't list these, even in the "less common wire designations" table. What is the correct mapping to the RTH3100C terminals: E Aux Y G O L R B, and C
SOURCE: Replaced Bryant T-stat model TSTATBBNB001 with Honeywell t-stat
Hello,You forgot to wire the O terminal w1 witch is the reversing valve.It is important to check if old stat is using O or B in witch case B terminal=w1 leaving O unused.
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