Have a new evaporator to install, and directions on box say to "1. Note Humidifier Control setting and turn dial to "OFF" position." ... however, there is no dial, at least, not on the outside. What do I do?
Humidifiers - Aprilaire - 550 Humidifier
Answers & Comments
They are talking about the Humidistat which is separate to the Humidifier. Turn the power off to the furnace and that will disconnect any power to the humidifier. Turn the water off to the Humidifier if you have to remove it from the plentum. Then go ahead and install your new evaporator. If you are looking for the humistat follow the T-stat wire and see where it goes from the water valve of the humidifier...... But they may not have installed one and are useing a different way to turn the Humidifier on in the heating cycle.....