Questions & Answers for: Aprilaire humming

Aprilaire 550 doesn't seem to be getting power checked the connections where the wires from the transformer connect to the circuit board inside the furnace and don't seem to have power. The furnace is

Aprilaire 600 valve won't open?? help I have 24 volts going into the controller, the light is on.There is no power coming out and telling the valve to open. If I hook those wires directly to the ...

aprilair model 760 does not go on I have relaced the solenoid,cleaned the water feed line, but the unit will not go on.Does anyone have any ideas If you replaced the solenoid yourself make sure that ...

New Aprilaire 700 - loud hi pitched whistle I just had an Aprilaire 700 installed on my 90k hi eff furnace (new last year). I keep hearing a hi pitched whistle when the humidifier goes on. Trying to ...

When I turn on the humidifier it shuts off the furnace The furnace only shuts off when humidity drops to the level that the humidifier has to turn on. some one has the humidifier hooked up to the R ...

Function of HUM terminal on 1Source Panel Can someone please explain what the HUM terminal does on a 1Source panel? I measured ~120V from it, however, was wondering if it only gives 120V when the ...

Instructions manual seems to imply that two 24 Vac (10VA) transformers are required if the HUM or ECA terminal is used to power the automatic digital control. HUM or ECA terminals are 120 volts. The ...

Why two 24 Vac on aprilaire 700's control unit? Aprilaire 700's control unit has terminals marked R, C, A, B, ODT, W/G, Cf, and H. The schematics indicate that A, C are connected to a 24Vac ...

connecting an Aprilaire 700M to my HVAC system. I do not have the wiring diagram for the fan control board for the HVAC system. Aprilaire diagram says to wire the 120VAC to 24 VDC transformer to the ...

Have a aprilair 550 for some time. Installed a new Lennox G61MP furnace and the technitions failed to reconnect the wiring that powers the humidifier. Need wiring schematic. Does humidifier ...