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The TH3210 is a heat pump thermostat. Sounds like you do not have a heat pump since you only have 4 wires. You will need the TH3110.
Can you give me model on your outdoor unit?
There should be a model on outdoor unit like S5QDA36 or similar
1. How any low voltage wires go to outdoor unit?
2.Does your outdoor unit normally run in heat mode or just cool?
That is what I suspected. You are not going to be able to use the TH3210 as it is designed for a heat pump. When you call for heat, the compressor is energized.
You will need the TH3110 for your unit or any single stage heat/single stage cool non heat pump thermostat
No problem, If you get the TH31110 you will use R with jumper to RC, G, W and Y.Thanks for letting me work with you.If my answer has been polite, professional,and thorough, please click one of the ratings before you go. If you still need help let me know!.Expert is not paid for assisting you until you rate answer.Feel free to follow up for 30 days at no additional cost. Bonus always appreciated if you feel justified.I am here most everyday if you need assistance with the new thermostat,just let me know.