I'm new to the forum, first post, so hello! I'd bother carrier with this, but they're not open till Monday and I'd like some experienced perspectives on this one.
I'm installing a carrier 58MVC 3-stage furnace and a Vision Pro IAQ. The IAQ is capable of 4h/2c stages.
How does one use the thermostat to control the three furnace stages? The docs seem tell me that I'll need to connect it in one of the following ways:
A - Use single heating stage from IAQ, let furnace modulate H, M, L (3 stages, but furnace controlled)
B - Use two heating stages from IAQ, force furnace to L and M (ie just 2 stages, switches set on the board)
C - Use two heating stages from IAQ, force furnace to M and H (ie just 2 stages, switches set on the board)
The terminals on the furnace board are W/W1, and W2. No W3. The IAQ has W1, 2, 3, 4.
As you can see, there seems to be no option to have the stat control the three stages, and I'd prefer that for this application since the IAQ is brainy and it's wired up to an extra remote indoor temp sensor, an outdoor temp sensor, humidifier, dehumidifier (via furnace) and HRV, and I imagine this as the central control of the whole operation so it seems to make most sense to have it decide on furnace stages etc.
Am I missing something obvious here? Are there advantages/disadvantages to having the furnace or the stat control switching stages?
Admittedly, I'm not a pro, my Dad is though (we're doing this together) and he's stumped too (he's not too handy on a computer, so here I am..) Please forgive me if this is an inappropriate post for this forum.