I'd previously asked if I could swap my wires from the 4 wire communicator to the larger board and was told I could. I finally found time to do it. However, as I was preparing to move the wires, I found there are 2 wires per post. A post has 2 green wires, B has 2 yellow, C has 2 white, and D has 2 red. I followed the wires and they go under my floor and I assume over to my pump that is outside. The other set of wires runs to the thermostat. If I'm swapping these wires to the main board do I move both wires or do I leave the ones that go to the pump and just move the thermostat wires? Hopefully all that makes sense.
Swapping to Hive thermostat. 4 wire communicator has 2 wires per post
hvacthermostat
Related Solutions
You moved the Green to C on one end but the picture with the transformer in the top left shows Green still on G there it should be on C.
The picture below you would pull the green wire off of Green at both the stat and furnace and move it to C/Common, then you jumper Yellow to Green at the furnace.
Since your question relates to "future proofing," it all depends on where you think thermostat technology is headed. These days, I would not ever install less than 18/7 thermostat wire if I had a choice. This also happens to be the number of wires that you need for your setup if you tie your humidifier common to the system common and use the ecobee3 "1-wire configuration" for the accessory setup instead of using the 2-wire configuration that assigns the accessory terminals as independent dry contacts.
The future is probably digital. If you want to cover all likely residential possibilities then pull two cables, an 18/8 thermostat wire and a CAT5 (or better) network wire.
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Best Answer
Leave the wires to the heatpump where they are at
Your system, instead of running Y, O/B, and C wires to the outdoor unit to control it, simply puts the compressor controller on the same ABCD bus that is used to connect the indoor unit to the matching (communicating) thermostat. As a result, when you remove the thermostat wires from the ABCD bus, you need to leave the wires to the heatpump in place, so that the indoor and outdoor units can talk to each other.