Hvac - Is there any risk of running both the fan and furnace at - What i'm finding ordinary is while the heating kicks on, it activates one after the other of the fan. But i can nevertheless flip the fan on whilst the furnace is jogging. Is the secondary fan the blower motor for the furnace and is there any hazard of walking both the fan and furnace at the identical time. When the fan turn on the thermostat is switched to the on position, the thermostat energizes the g terminal. This tells the furnace to show the blower motor on. If the furnace is ready with a multi-velocity motor, the motor will generally be in excessive speed when the g terminal is energized.
While in cooling mode, the furnace doesn't generally do a great deal in any respect. While the thermostat is too warm, it typically energizes each the y and g terminals (if you're the use of a warmness pump, the o and/or b terminals could also be energized). The y terminal tells the condensing unit (or heat pump) to turn on, whilst the g terminal tells the furnace to show on the blower (once more, at excessive pace).