Question about Aprilaire 550 Humidifier
I am not getting water to the unit. I removed the water line and it is not clogged so it has to be the unit. What is the likely problem?
Was having a similar problem. Disconnected the source line and opened saddle valve. I was getting water to the solenoid but nothing out the other side. My humidistat doesn't have a "test" setting, it's either off or the highest humidity. I held the outbound line in my hand and experimented with adjusting both sadlle valve and humidistat. I didn't get any water until I opened the saddle valve MUCH further than I thought was necessary and turned the humidistat to near the highest setting. Once I had water coming though I experimented with the setting on the humidistat, turning it off and then slowly increasing the humidity until the solenoid clunked and water started coming out. I would recommend anyone having this same problem to open the saddle valve all the way (I was surprised how many turns that took) and set the humiditstat to it's highest setting.
Posted on Apr 17, 2009
I have similar problem and need more or further ideas. Saddle vale is open and water is getting to solenoid, but not through it. I have simple dial humidistat and when i do turn this I hear a click at the humidistat but don't really hear anything at the solenoid or the furnace.
Questions now that I read this are: does the furnace need to be on and blowing for the value to open and the water to flow? Is there anything else I should check? I suspect I have dirt clogging the coil area in the furnance because I do have to reset a breaker every now and then. The humidifier has always worked until this winter. Troubleshooting found the saddle value closed so i opened that. Just not seeing water get through. Don't want to spend $50 bucks on a solenoid when so many here have said it did not help. fear it is something else.
Posted on Jan 24, 2008
Did you just install this unit, or has it been working for a while and just stopped?
1. If you just installed it, the solenoid wires (yellow) must be hooked up to switch in when you have a call for heat.
a) use a current sense relay OR
b) connect 120V & neutral to "HUM" terminal and neutral on heater control board.
2. If it has worked before, maybe the saddle valve is plugged. Turn the "T" handle all the way clockwise, then all the way out CCW. You can hear the water start flowing. Loosen compression fitting at solenoid valve to make sure water is getting there.
3) Also, you must supply 24V to the circuit to open the solenoid valve. Check your wiring. It depends on the model what way to wire it and I cannot go into that here.
4) Testing: Turn off humidistat control. Turn on heat, wait for blower to come on. Turn humidistat control to test posn. Solenoid valve should click. This will put water into top of Aprilaire tray, after few minutes it will dribble out bottom clear vynl tube to the
Posted on Dec 19, 2007
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