What does the thermostat tell a HVAC fan to turn on?
What does the thermostat tell a HVAC fan to turn on?
The thermostat is what tells these separate systems to work together. In normal operation, when your thermostat is set to “auto,” it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached.
How does the HVAC blower hook up to the thermostat?
There is no other way to get power to the blower. Thus there has to be a short in the thermostat wiring between the furnace and my thermostat. Tracing the wiring – I find that there is a midline splice in the line, that is used to tie in the A/C compressor to the circuit.
Why does my furnace not turn on when the AC is on?
It sounds silly, but mistakes happen, and the furnace won’t turn on if the indoor air temperature is warmer than the thermostat’s temperature setting. Likewise, the air conditioner won’t turn on if the indoor air temperature is cooler than the thermostat’s temperature setting.
When does the HVAC fan turn on and off?
In normal operation, when your thermostat is set to “auto,” it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached. In many systems, the blower fan runs a minute or so before heating or cooling begins and ends to get air flowing.
How can I Turn my furnace back on after turning it off?
Leave the power to the furnace on. Go to the thermostat and turn it to OFF and the fan to AUTO. Then go to the furnace and turn the power to the furnace off for 30 seconds. After that, turn power to the furnace back on and go back to the thermostat. Set the thermostat to HEAT and the fan to AUTO.
There is no other way to get power to the blower. Thus there has to be a short in the thermostat wiring between the furnace and my thermostat. Tracing the wiring – I find that there is a midline splice in the line, that is used to tie in the A/C compressor to the circuit.
It sounds silly, but mistakes happen, and the furnace won’t turn on if the indoor air temperature is warmer than the thermostat’s temperature setting. Likewise, the air conditioner won’t turn on if the indoor air temperature is cooler than the thermostat’s temperature setting.
The thermostat is what tells these separate systems to work together. In normal operation, when your thermostat is set to “auto,” it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached.