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Yes, its a T636 OB. Thanks.

I'm trying to replace my old honeywell (t636) thermostat with a Sunvic TLX 7501 digital thermostat. The current wiring has a brown going into 1, a black going into 2, and a brown going into 3. It is also earthed. Am I able to just use the same wiring? Is this an industry standard? or do I...