The new Aprilaire # 58 automatic humidifier control works in conjunction with your furnace to control the operation of the humidifier. The control senses indoor RH and outdoor temperature and automatically adjusts the operation time of the humidifier to provide the optimum humidity level in the home. The digitial readout on the control displays the RH level inside the cold air return. Can also be used in manual mode when it is not possible to run wire to outdoor sensor. MOUNTS ON RETURN DUCTWORK
New lighted display includes indoor relative humidity readout, service indicator light, water panel change light, and "on" indicator light
NOTE: control must be continously powered for proper functionality - separate 24 volt transformer may be required.
In order for the humidifier to operate, the furnace blower must be running and the humidifier control must be calling for humidity. There are several different ways to detect blower operation - see installation instructions for details. 24 VAC is also required between W/G and Cf terminals. See support addendum for details.
TYPICAL WIRING - USING FURNACE TERMINALS TO DETERMINE BLOWER OPERATION
Ordered the mod..#58 humidifier controller and only one minor problem. With the 3+ feet of snow in the Chicago area the outside thermistor was impossible to install, that's not the minor problem. I attached the manual resister to temporally checkout the unit. My humidifier is an old model 112 Aprilaire, it would not work per setup instructions. A short phone call solved the problem. The internal switch had to be put in the A position. The instructions with the control show the switch in the B position for mod.112 and that in the wrong position may damage the unit. This setting is apparently determined by the age of the humidifier, not clear in the instructions.
Everything works fine now. When the weather permits I will install the outside thermistor.
1/11/2011
5.0
Does what it is supposed to do
By sabfish
from Chevy Chase, MD
Pros
Clear display
Easy to install
Cons
Best Uses
Comments about Aprilaire #58 Humidistat:
The advice on the website aided the installation
12/30/2010
5.0
A great upgrade
By danno
from fond du lac,wi
About Me Handyman
Pros
Durable
Energy Efficient
Cons
Best Uses
Whole House Humidifiers
Comments about Aprilaire #58 Humidistat:
old controller died,$10(approx) more for this unit is well worth it.Had to run 24 v constant power to control,which is worth it since it has diagnostics&status indicators.
3/5/2010
5.0
Excelent Product
By Dustin
from Eyota, MN
About Me Homeowner
Pros
Ease of Use
No guessing
Set and forget
Cons
Light stays on
Best Uses
Whole House Humidifiers
Comments about Aprilaire #58 Humidistat:
Manual humidistats required us to make adjustments every couple of days depending on the weather. We have a lot of wood in the house so we need to keep the moisture level as high as possible. As it would get colder during the night or even during some of the days we had to adjust the humidistats to keep the water from condensing on the windows. With the #58 we just set it and made small adjustments so there wouldn't be any condensation on the windows. If it gets warmer or colder outside, we don't have to do a thing anymore.
2/19/2010
(1 of 1 customers found this review helpful)
5.0
Fried 1st One!
By Eggs
from Ottumwa, IA
About Me Homeowner
Pros
Holds Humidity Levels
Cons
Best Uses
Whole House Humidifiers
Comments about Aprilaire #58 Humidistat:
Works perfectly unless you hook up a furnace's HUM terminal directly to humidistat terminals. Doesn't appreciate 120V coming into a 24V circuit. Pops, sparks and dies! New one works flawlessly and holds the humidity level set, unlike the manual models I have had in the past.
2/15/2010
4.0
good replacement for my original part
By creek man
from St. Leonard Maryland
About Me Homeowner
Pros
Cons
Doesn't Fit
Best Uses
Whole House Humidifiers
Comments about Aprilaire #58 Humidistat:
this was a replacement for another "aprilaire" 600 which was a new heat pump installation. The 600 model was exposed and only last 3-4years.
2/4/2010
5.0
Poifect!
By Barry
from Tyngsboro, MA
About Me Homeowner
Pros
Durable
Easy Install
Energy Efficient
Cons
Best Uses
Whole House Humidifiers
Comments about Aprilaire #58 Humidistat:
Simple directions, easy install replacement for original AprilAire humidistat.
Although packaged for installation by a HVAC technician, it's simple enough to do if you have a basic understanding of making electrical connections, a basic toolkit (drill, 3/4" bit, screwdrivers) plus some simple supplies (2-conductor wire, wire caps, zip ties, self-tapping screws).
2/3/2010
4.0
Good Product
By Ken
from Rochester, NY
About Me Handyman, Homeowner
Pros
Cons
Doesn't Fit
Best Uses
Whole House Humidifiers
Comments about Aprilaire #58 Humidistat:
I replaced a manual Aprilaire controller and had to cover a large rectangular hole in the duct with sheet metal and drill a smaller hole for the new #58 unit to fit. The #58 comes with a thermistor, so I didn't have to buy one separately which I did because the literature didn't say what was included in the box. Other than that, the installation went smoothly and I'm happy with the product. I'd recommend the #58 to anyone handy enough to patch and drill sheet metal.
1/31/2010
5.0
Great Humidistat
By Jeff
from Canton, MI
About Me Handyman, Homeowner
Pros
Energy Efficient
Good Fit
Cons
Best Uses
Whole House Humidifiers
Comments about Aprilaire #58 Humidistat:
This Humidistat works great with my General Filters whole house humidifier. I had the older model auto stat at my old house and when we moved this was a no brainer upgade. With this humidistat and the sensor mounted outside you won't have to worry about those windows getting wet or the house getting to dry. This thing works and it make life alot easier.
1/29/2010
5.0
Excellent replacement
By Shaun
from Saint John, IN
About Me Handyman, Homeowner
Pros
Accurate
Durable
Energy Efficient
Good Fit
Cons
Installation
Best Uses
Whole House Humidifiers
Comments about Aprilaire #58 Humidistat:
My aprilaire humidifier/humidistat that was installed along with my furnace in a our new home in 2007 started malfunctioning by making the home overly humid in the cold winter months. I live in northwest Indiana (Chicago area) in a very well insulated home with R50+ total in attic and R20+ total in walls, and on brutally cold days the windows and walls would be dripping with moisture. I found that the cheap aprilaire mechanical humidistat would not correctly determine the humidity level in the house, it seemed that it would only turn on or off manually around 30% humidity. I replaced it with the #58 humidistat along with the outdoor sensor, which was a pain to run the wiring, but was well worth the trouble. My home is more comfortable than it ever has been in the winter. I have the dial set in the middle number of the normal range. It keeps at a 30-40% level mainly except for 0 degree or lower nights where the humidity level may decline. I love the "set it and leave it" mentality it provides and it makes adjustments automatically according to outdoor temperature.
