Can't figure this 3 wire system out or find anything in postal about it

Honeywell T3 Thermostat Wiring

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Honeywell Lyric T5 Thermostat Heat Pump Wiring Diagram - Collection

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How to install your automatic lyric thermostat

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Honeywell Programmable Thermostat Rth2300b Wiring Diagram - 4K
Honeywell Programmable Thermostat Rth2300b Wiring Diagram - 4K

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This is how i wired my Honeywell Lyric T5. It operates the heat just
This is how i wired my Honeywell Lyric T5. It operates the heat just

Honeywell Lyric T5 Thermostat Heat Pump Wiring Diagram - Collection
Honeywell Lyric T5 Thermostat Heat Pump Wiring Diagram - Collection

How To Install Your Automatic Lyric Thermostat - Chapter 3 - YouTube
How To Install Your Automatic Lyric Thermostat - Chapter 3 - YouTube

Installing New Thermostat Wiring : Help With Honeywell T5 Lyric Install
Installing New Thermostat Wiring : Help With Honeywell T5 Lyric Install

Room thermostat wiring diagrams for HVAC systems
Room thermostat wiring diagrams for HVAC systems

HONEYWELL HOME T3 THERMOSTAT WIRING CONNECTIONS AND SETUP - YouTube
HONEYWELL HOME T3 THERMOSTAT WIRING CONNECTIONS AND SETUP - YouTube

Honeywell Lyric Thermostat Wiring - Thermostat Wiring Guide For
Honeywell Lyric Thermostat Wiring - Thermostat Wiring Guide For

Can't figure this 3 wire system out or find anything in postal about it
Can't figure this 3 wire system out or find anything in postal about it