Answered: Compatibility question weird wiring - Google Nest Community

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I have no idea what the A+ and B- mean.

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Explained quite well here:
Need Advice on Connecting a Nest Thermostat to My Geothermal Heat Pump System : Nest

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Explained quite well here:
Need Advice on Connecting a Nest Thermostat to My Geothermal Heat Pump System : Nest