Hello,
I just purchase an Aprilaire 500a whole home humidifier. While I wait for it to be delivered, I have been familiarizing myself with the installation process. I'm looking at the wiring section and I have a few questions for those who can help. The typical wiring for this unit is to use a 24v transformer off a 110v line. The problem I'm running into is my furnace ( A Lennox CBX27UH-024-230-6-02 Electric Furnace) is on 240v. I don't have any other nearby outlets, so I would have to run a dedicated 110v line just to control the unit.
I've been doing some research and on the inside of my furnace there is a 24v terminal (R) and a common (C). My question is can I just wire my humidifier directly to those terminals for constant power and forego installing the transformer all together? The thing that has me second guessing is a note in the instructions not to wire the transformer into the blower circuit. I think I'm OK, but the text is bold and scary so I figured I'd ask before assuming .
My second question is the humidifier control panel calls for a 24v accessory line to be wired into the panel ( I'm guessing some sort of sensing signal?). The directions say to look for a "HUM", "ACC", or "EAC" terminal. Just looking at the schematics my unit doesn't appear to have those terminals. There is however a "ECON" terminal. Would this stand for "External Connection"? It seems to be wired to the 24v and the blower terminal which leads me to believe its only energized when the blower comes on ( correct?). So would this suffice as the 24v acc line I can use? Should I test this terminal with a multimeter while the furnace is running to verify 24v?
I have attached the wiring diagrams below for both the humidifier and the furnace. Thanks for any help !
I just purchase an Aprilaire 500a whole home humidifier. While I wait for it to be delivered, I have been familiarizing myself with the installation process. I'm looking at the wiring section and I have a few questions for those who can help. The typical wiring for this unit is to use a 24v transformer off a 110v line. The problem I'm running into is my furnace ( A Lennox CBX27UH-024-230-6-02 Electric Furnace) is on 240v. I don't have any other nearby outlets, so I would have to run a dedicated 110v line just to control the unit.
I've been doing some research and on the inside of my furnace there is a 24v terminal (R) and a common (C). My question is can I just wire my humidifier directly to those terminals for constant power and forego installing the transformer all together? The thing that has me second guessing is a note in the instructions not to wire the transformer into the blower circuit. I think I'm OK, but the text is bold and scary so I figured I'd ask before assuming .
My second question is the humidifier control panel calls for a 24v accessory line to be wired into the panel ( I'm guessing some sort of sensing signal?). The directions say to look for a "HUM", "ACC", or "EAC" terminal. Just looking at the schematics my unit doesn't appear to have those terminals. There is however a "ECON" terminal. Would this stand for "External Connection"? It seems to be wired to the 24v and the blower terminal which leads me to believe its only energized when the blower comes on ( correct?). So would this suffice as the 24v acc line I can use? Should I test this terminal with a multimeter while the furnace is running to verify 24v?
I have attached the wiring diagrams below for both the humidifier and the furnace. Thanks for any help !