Does this dehumidifier control measure the humidity from the control itself or from the dehumidifier it’s wired to?

It measures humidity where it is located. However, there is no "set point" on the dehumidifier control. You can only set it to remove more or less humidity. The aprilaire dehumidifier I had it hooked to broke in 2 1/2 years. Aprilaire covered it under warentee; however, you have to get an AC technician to certify it is broke before they will replace it. It cost me $150 to have it certified as broke. I had to uninstall it and they sent me a new one. I put the new one in and it broke in about 2 or 2 1/2 years. I gave it to an AC technician. They fixed it and it broke again in 2 to 2 1/2 years. However, he could not fix it as Aprilaire does not sell a lot of replacement parts and the ones they sell are incredibly expensive. Oh, I installed this dehumidifer control and it broke in about 1 1/2 years. Might want to consider installing a different brand of dehumidifier and dehumidifier control.

Will this work on an 1830 ?

The 76 dehumidifier control will work with our 1830 as either Remote or External. Aprilaire Tech Support Team

I have the aprilaire 1850. i need to know exactly what kind of low voltage wire to use to connect the dehumidifier unit to the external control.

There is special wire that is sold for use with an air conditioning or furnace thermostat. The outside of the wire is typically brown. The internal wires are color coded. This wire is sold with 4 wires or 6 wires. The 6 wire one is more expensive. You need 4 wires. So go to any Lowes, Homedepot, Ace Hardware, etc. and you can find it. It is sold by the foot, or sometimes in pre-cut lengths. The dehumidifier has a main control panel. As you are looking at the intake air side of the dehumidifier, it is located on the left top just below the knob that allows you to adjust the humidity setting. On this control panel, in the lower left is a terminal block, for wires. The connection points are labeled A, B, +, -. On the external control there is a terminal block with connections labeled A, B, +, -. The wires will be color coded. So, pick a color. For example, pick red and hook it to the A terminal on the dehumidifier, and the A terminal. Pick another color like yellow. Hook the yellow wire on the B at the unit and on the B at the control. This is a low voltage (24 v) low current application. Therefore, this wire is designed to do exactly what you want it to do. You might want to consider not buying the external control. I had two of these. They do not last long, like a couple of years. You can only set them for wetter or dryer. You cannot set them at a specific set point. So, if you want 55% humidity in your house you cannot set the controller at 55%. You have to increase and decrease, on the controller, the amount of "wetness" you desire. The knob on the dehumidifier does the same thing. The return air, which is at the same humidity as your house gets pulled across a sensor in the dehumidifier. This knob adjusts the wetness of the air just like the one you mount in the room. Also, if you read the reviews on the 1850, this dehumidifier only lasts 2 to 3 years. So, within 2 or 3 years you most like will be replacing either the dehumidifier or the controller. I purchased an Ultra-Aire dehumidifier after 2 of the Aprilaire dehumidifiers broke within about a 6 year period. In my opinion, the Ultra-Aire is a much nicer dehumidifier and it last longer than the Aprilaire. Moreover, the Ultra-Aire has a remote controller that allows you to set the exact humidity you want.

ASIN	B00QW2BLSA
Best Sellers Rank	#195,245 in Kitchen ( See Top 100 in Kitchen ) #573 in Cooling Dehumidifiers
Brand	Aprilaire
Brand Name	Aprilaire
Color	White
Colour	White
Customer Reviews	4.3 out of 5 stars 333 Reviews
Global Trade Identification Number	00686720000768
Included Components	Remote Controller
Item Dimensions D x W x H	2.2D x 10.8W x 7.2H centimeters
Manufacturer	Aprilaire
Material	Plastic
Model Name	76
Model Number	76
Number of Speeds	1
Number of speeds	1
Operation Mode	Continuous
Other Special Features of the Product	Digital Display
Part Number	76
Product dimensions	2.2D x 10.8W x 7.2H centimeters
Recommended Uses For Product	Commercial
Recommended uses for product	Commercial
Special features	Digital Display
UPC	686720000768
Unit Count	1 Count
Voltage	24 Volts (AC)
Wattage	120 watts

Aprilaire 76 Digital Wall Mount Dehumidifier Control

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