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Message
re: Installing a smart thermostat
Posted on 7/23/23 at 8:16 pm to MikeBRLA
Posted on 7/23/23 at 8:16 pm to MikeBRLA
quote:
air handler in the attic which is 110.
Not all of them are like. My HVAC system has a 220V breaker for the outside unit and another 220V breaker for the air handler. If you know how to read a schematic it will show you what voltages are being used. My unit has a step down transformer that is 220 input and 24V output. And that is what powers the control circuit for my unit
2
Posted on 7/23/23 at 10:08 pm to Miketheseventh
quote:
My unit has a step down transformer that is 220 input and 24V output. And that is what powers the control circuit for my unit
Unless the system is very old, the control system will always be 24V, otherwise the wiring to the thermostat would need to be much heavier gauge. The CPT (control power transformer) will be in the furnace in the attic. You can find the small thermostat wire coming out of the furnace and going through your attic and down the wall to thermostat. It will be a brown wire with either 5 or 6 #18 conductors/wires inside. The 24V power to the thermostat is usually the blue wire unless your HVAC installer did something different.
As others suggested, simplest thing is to unplug the furnace in the attic. If you want to chase down the breaker that’s fine too but will take longer.
Posted on 7/24/23 at 4:38 am to Miketheseventh
quote:
Not all of them are like. My HVAC system has a 220V breaker for the outside unit and another 220V breaker for the air handler. If you know how to read a schematic it will show you what voltages are being used. My unit has a step down transformer that is 220 input and 24V output. And that is what powers the control circuit for my unit
Thats how they all work. Gas Furnaces are 120 volt.
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