I have an AprilAire 550A with a broken humidistat. I thought I saw that the #4655 replacement humidistat would work with the 550A. Wrong! There are 6 areas for wires to connect in the old (broken) humidistat, and the new one (#4655) only has two because it is manual and doesn't connect to the outside probe, etc. What do I do now? I can't seem to find a 550A replacement.
I believe they just updated model number descriptions. The basic design of that humidifier hasn't changed much over the years. I would go to their website and look for the one that is simiar to your model and get the humidistat for it. They are pretty basic devices as far as what the humidistats do. 24v power and common
SOURCE: Aprilaire 550 humidifier
Did you clean the orfice ? It is located on bottom of solenoid. It is plastic with a very small hole.The hole gets plugged and you can clean it or buy a nw one for 50 cents.
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SOURCE: he 260a wiring w/humidistat
try this forum...there are wiring diagrams posted there:
http://forum.doityourself.com/humidifiers-dehumidifiers-130/
SOURCE: Wiring issue with the Honeywell HE360A Humidifier
Maybe I can help. this is 24v so it doestn't matter which wire goes where so here goes. 2 wires from humidistat go to furnace, split one of the wires(not both) so they reach the yellow wires on the humidifier. with marettsconnect one of the split wires to one of the yellow wires. do the same to the other split wire and yellow wire. what you should get is one wire from humidistat to furnace then one wire from humidifier to humidistat and one from humidifier to furnace. hope this helps
SOURCE: Solenoid won't open--voltage drops when connected to humidistat
The coil may shorting out the 24vac supply to the solenoid. Recommend replacing soleniod.
Normally you should be able to read the 24vac across the solenoid when energized.
The other option is to get a 120vac to 24vac transformer and test the solenoid. This way you will know if the solenoid is the cause or the 24vac source is the problem.
SOURCE: My Aprilaire 700 does not seem to be working. The
you can bypass the humidistat by shorting the 2 brown wires on the bottom of the humidifier. just remove the 2 wire nuts and touch the 2 together (just 24v)if it comes on then there is a control problem with the humidistat or wiring if it doesnt come on the control board or transformer may be bad or you dont have 120v to the humidifier on the plug. also make sure your furnace blower is running cause the hum cant come on if its wired properly unless the fan is running. you also may want to go to www.aprilaire.com and get a maintenace kit from their online store. it comes with pad and new hose along with a couple other things.
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