Need advice on thermostat wiring for carrier Furnace and AC

Old 02-13-15, 02:11 PM
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Need advice on thermostat wiring for carrier Furnace and AC


I have:

Carrier 58MN7A Furnace (two stage)
Carrier 24ANB6 A/C (I think is single stage only based on only having three wires going to it)

I am wiring in a new thermostat and have a question about the wiring.

My question is for the A/C wiring in particular.

The MB in the Carrier Furnace has a connector for Y/Y2 and Y1
The MB in the Carrier A/C has a connector for only Y

Is it wrong to connect both the Y/Y2 and Y1 wires to the Thermostat?

Connecting the wire makes the system think I have dual stage cooling... but I wasn't sure if this is for fan control or something else and that I need to have a dual stage A/C unit for this.

Your help is greatly appreciated.


Old 02-13-15, 04:56 PM
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Here is a link to the A/C installation manual. Toward the end it show thermostat wiring.

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