What terminals do you wire a humidifier to?

Use 18-2 low voltage wire as directed in the humidistat or humidifier instructions. Everything should be labeled on the humidistat. Two terminals will connect to the humidistat and two will go to the control board.

How do you wire a humidifier?





Quote from the video:
Quote from Youtube video: Using our 22 or 18 gauge two-conductor wire which is provided by yourself is going to be hooked into this little panel. Here two of the terminals are for 24 volts AC which would be out of the furnace.

Can you wire humidifier to W and C?

I don’t have a 24v transformer, so I hooked up the humidifier using the W and C terminals. It does work, but only when the air is being actively heated. It turns off when the heat distinguishes. At this point, the fan still runs to circulate the heated air that’s already in the ducts.

How do you wire a humidifier solenoid on a furnace?

Quote from the video:
Quote from Youtube video: And the common terminals where you draw the 24 volts ac when the thermostat calls. For humidity then I ran high temp 105 degrees C wire from the furnace.

What color is humidifier wire?

R: Power (usually has a red wire) C: Common. W: Heating (usually a white wire) Y: Cooling (usually a yellow wire)

How is a humidistat wired?





Grab one humidistat lead and one black-colored low-voltage wire strand. Twist the ends together with pliers. Screw a wire nut over this pair of wires. The interchangeable humidistat leads, the two short pieces of wire extending from the rear of the humidistat, can connect to either black-colored low-voltage wire.

Should humidifier be connected to hot or cold water?

The humidifier works better with hot water, so avoid connecting it to the cold water line.

How do you install a transformer humidifier?

Quote from the video:
Quote from Youtube video: First turn off the power to the furnace. Next rotate the knobs securing the blower chamber panel on the furnace.

Should a humidifier be installed on the supply or return?

Proper installation



One of the most common questions is where to mount it — on the return or supply side. For most types of humidifiers, it really doesn’t matter, notes Lewis. “The furnace has a negative pressure on the return air and a positive pressure on the warm air side.

What does a solenoid do on a humidifier?



What Is a Solenoid? The solenoid is an electrically actuated valve that allows water to flow to the humidifier and is controlled by the humidistat—a sensor that operates like a temperature thermostat but is designed to sense humidity.

How do I add a humidifier to my furnace?

Fast and easy way to install a furnace humidifier to increase your home comfort

  1. Step 1 – Marking & Cutting the Hole. …
  2. Step 2 – Mark & Cut Outline of the Humidistat. …
  3. Step 3 – Install Electrical for the home Humidifier. …
  4. STEP 4 – Connect The Furnace Bypass Humidifier. …
  5. STEP 5 – Install Water Line to The Humidifier.


How do I check the voltage on my humidifier solenoid?



Quote from the video:
Quote from Youtube video: Turn your humidistat all the way to the highest setting while the furnace is running. Test with your voltmeter. To determine if the valve is getting around 24 volts.

Is RC and C wire the same?

The C and Rc wires are not the same. To install this thermostat you should follow the exact same wiring of the previous thermostat.

What color is the C wire?

Blue wires

Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.

What are common wires?



The common wire is normally the white wire, at least in the United States, and is often called the neutral wire. It’s also called common because all circuits in the house typically have the white wires tied together, which means every circuit has that wire in common.

What color wire goes to Common?

White. The “common” is the “neutral” or “ground” wire, depending on the type of circuit. In normal US residential wiring, you’ll have a black “hot” wire, a white “neutral” or “common” wire, and a green or bare “ground” wire.

What are the 3 types of wiring connection?

The electric power line enters our house through three wires- namely the live wire, the neutral wire and the earth wire.

What Colour is the common wire?

“COM” or “Common” is the terminal to which the live core wire is attached – this is the brown wire (formerly red).

Do red and black wires go together?



These wires are typically used for switch wiring as well as the interconnection between smoke detectors hard-wired into the power system. You can link two red wires together, or you can link a red wire to a black wire. Since red wires conduct current, they are considered hot.

What Colour is live and neutral?

Plug wiring colours

Wire Colour
Live Brown
Neutral Blue
Earth Yellow and Green