Question about Aprilaire 550 Humidifier

1 Answer

I have an Aprilaire 550 hooked up to my furnace,

I have an Aprilaire 550 hooked up to my furnace. I have lived in the home for 3 yrs but never used it. I thought I would give it a try. I cleaned the unit out and replaced the water pad inside. I turned the humidity up to about 25% and I heard the water start run into the unit. The problem is that the unit runs constantly, even when the furnace is not running. I don't believe that it should be running when the furnace is not on. What do you believe the problem is?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 111 Answers

In order for the humidifier to come on with the heater there has to be a temperature sense curuit to turn it on/off at a certain temp, the humidity curcuit on the unit will turn it off at set %

Posted on Jan 31, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have an Aprilaire 550 model. I just noticed that it is not turning off when the furnace turns off. Please advise


Do you have a current sensing relay or sail switch hooked up to it? If not than you need either one of theses to turn on and off the humidifier when the furnace's blower motortruns on and off. I will post a pic of both robhvac47_1.jpg CURRENT SENSING RELAY.


robhvac47_2.jpg SAIL SWITCH

Dec 25, 2010 | Aprilaire 550 Humidifier

1 Answer

Loud vibrating noise when the furnace blower starts up.


Try closing damper slightly between humidifier and furnace????

Feb 03, 2010 | Aprilaire 550 Humidifier

1 Answer

How much water should be draining from Aprilaire 550?


thats too much.. and a waste of water... you should install a good ball valve water shutoff inline and let it trickle.. ideally, it should be net zero water wastage but there's always a bit.. my water take-off drain runs about once every 5hrs and its about a litre (its siphoning water out of the combustion chamber as well as the waste water from the humidifier.. (you can get those ball valves at homedepot for about 6bucks -- they're usually compression fittings as well)

Jan 11, 2010 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 550 makes extremely loud grinding noise when turned on


yes it should be bypass but solenoid could be trying to open but the voltage to it may be to low if you have 24v ac power at the 2 small wires. but to change shut down power to furnace and water to humidifier.you loosen the 2 compression nuts unwire they cant be reversed so dont worry then 2 mounting screws then reverse to install

Dec 17, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire


Commonly outdoor wood boilers use a hot water coil mounted in the ductwork above your furnace. In this application the Ruud furnace is still using its blower assembly to circulate the warm air from the boiler to your home. If this is the case. Have your heating guy install a #50 relay on the furnaces blower motor to activate your much needed humidifier. If this is not the case and your Ruud furnace is totally independent of the boiler. Still install the #50 relay in the furnace and manualy activate the fan only feature on your thermostat.
Good luck
HVAC Teacher

Feb 21, 2009 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 550 has exploded with water


No water should not just sit there in the system. It is supposed to recirculate itself. You should really call a tech out and have them check your system.

Feb 11, 2009 | Aprilaire 550 Humidifier

1 Answer

Hooking up a used 550 to a new 80% trane UD-R9V,


In this situatioin you'll eed a second transformer 110volt to 24 volt to relay from w to common to operate only when furnace being called for.

Feb 07, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 600 bypass water flow rate


The water is only dispensing over the evaporator pad while the furnace is in the heating mode. When the furnace finishes cycling the humidifier will also stop.

Mar 04, 2008 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 550 doesn't seem to be getting power


See if you have a screw marked EAC This to power an Electronic Air Cleaner unlike the HUM it also gets 120VAC only when the fan comes on. Not sure what make of furnace you have but if your heat is working OK don'tn change the control board the can be very expensive. there are other ways to wire humidifiers without using the HUN screw

Dec 23, 2007 | Aprilaire 550 Humidifier

Not finding what you are looking for?
Aprilaire 550 Humidifier Logo

258 people viewed this question

Ask a Question

Usually answered in minutes!

Top Aprilaire Humidifiers Experts

paulcarew

Level 3 Expert

2458 Answers

jdthefixer

Level 3 Expert

744 Answers

Mack Baxter

Level 3 Expert

381 Answers

Are you an Aprilaire Humidifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...