How To Turn On Furnace Humidifier. A comfortable relative humidity for most homes. If it is on the return side, the air would be at room temperature.
First, turn the humidistat on your whole house humidifier to the off position. You set it for the desired humidity level (typically 30 to 45 percent), and when the humidifier reaches that level, the water supply is turned off by the solenoid water valve assembly. Turn your furnace thermostat to heat and turn up to call for heat on the furnace.
When the furnace begins running, the humidistat should call for humidity, the solenoid valve should open, and water should come out of the water inlet tube and drain into the humidifier drain.
First, turn the humidistat on your whole house humidifier to the off position. If you aren’t sure how to cut off the water to your central humidifier, simply find the copper or plastic water line that is connected to your humidifier, follow it back until you find a valve, then turn the. You set a thermostat for a specific temperature, and when that temperature is reached, the furnace turns off. Ensure your humidistat is turned up to the highest setting.