T-stat replacement help

Old 01-24-14, 10:11 AM
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T-stat replacement help

I need some help with a T-stat replacement. I have an old White Rogers thermostat that I'm replacing with a Honeywell WiFi and I need a c wire

The old thermostat has the following:

Connection / Wire
R / Red
W / White
Y / Yellow
G / Green
N/A / Blue

The blue wire not connected to the T-stat or furnance.

At the furnace board (Bryant 359AAV) I have:

Furnace / Wire from T-Stat / Wire from A/C
R / Red / N/A
C / N/A / Red
W / White / N/A
Y / Yellow / Yellow
G / Green / N/A
HUM24VAC / N/A / N/A

My plan is to connect the extra blue wire to the C terminal on the new T-stat. My confusion is at the control board.. should it connect to the C terminal or the Hum 24VAC terminal?

Thanks for the help
Old 01-24-14, 12:44 PM
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Join Date: Oct 2009
Location: Texas
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Connect blue to the furnace C terminal and stat C terminal.

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