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

A C Wiring Colors

3-phase wiring, colors, and configurations Thermostat wiring wire heat color diagram pump air nest guide common goodman colors honeywell code labels heater aruf handler wires

Electrical colors wiring usesi different Defining the different electrical wiring colors Carrier thermostat wiring color code

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

Conditioning thermostat

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

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Carrier Thermostat Wiring Color Code
Carrier Thermostat Wiring Color Code

Defining the Different Electrical Wiring Colors - USESI
Defining the Different Electrical Wiring Colors - USESI

3-Phase Wiring, Colors, and Configurations | Vertex CC
3-Phase Wiring, Colors, and Configurations | Vertex CC

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