Aprilaire 700 And Goodman GMV90905DXA

WGFA

Does anyone have some info on how to hook the Aprilaire 700 to my goodman GMV90905DXA? I hooked it up to R and C it just runs constantly. Any help would be greatly appreciated. Thanks CJ

bigjohnsons34

there's a couple of ways to wire it you can either wire it to (w and c ) then it will only come on with a call for heat or it should of come with a transformer with the humidifer and on the main controll board you'll see a terminal marked (hum) hook it up to that and common and then wire the low voltage through the humidastat... good luck its pretty easy to do

rakes9720

There is a short, cut brown wire in the burner compartment that comes off the low pressure switch (upper right just below the burners). You are supposed to strip that wire and connect your humidifier 24Vac hot line to that and somehow run it out of the furnace, then connect the 24Vac common line to the C screw terminal on the furnace control board.

WARNING: Only use the hum terminal on the furnace control board if your humidifier runs 120Vac! Since it worked when connected to R and C, it runs on 24Vac, and connecting to this terminal will probably destroy the humidifer, electricute you, or start a fire.

Read the furnace installation book, it has some information on this