ProThermostats.com > Aprilaire #4655 Humidistat

Aprilaire #4655 Humidistat

Aprilaire #4655 Humidistat

About This Product

MFG: Aprilaire
MFG#: 4655
Our#: 171317
The Aprilaire 4655 Humidistat is designed for low voltage service to control humidification equipment. An increase in relative humidity expands the nylon ribbon which opens the control switch to stop operation of the humidifier. A decrease in relative humidity reverses the process and closes the control switch.  Can be wall mounted or mounted on return plenum.  Includes plenum cutout template (4 5/32" X 2 7/16").  For duct mount, locate at least 6" upstream of humidifier, humidifier bypass ductwork or fresh air intake ductwork.

Specifications

Range - 15% to 50%

Operating Differential - 8% RH Maximum

Dimensions - 5 1/8" W X 3 3/8" H X 1 15/16" D

Electrical Data -

SPST Switch
2 Wires
24 VAC
Max. Load (contacts) - 5.2 Amps

For use with models: 110, 112, 220, 224, 350, 360, 400, 440, 445, 445A, 448, 500, 550, 558, 560, 560A, 568, 600, 700, 760, 760A and 768

ProThermostats.com Price:

$35.26

Regular $49.95, You Save $14.69 (29%)
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REVIEW SNAPSHOT®

by PowerReviews
Aprilaire #4655 Humidistat
 
4.3

(based on 55 reviews)

91%

of respondents would recommend this to a friend.

Pros

  • Good size/fit (16)
  • Adjustable settings (14)
  • Easy to use (10)
  • Energy efficient (9)
  • Durable (8)

Cons

  • Not durable (4)

Best Uses

  • Whole house humidifiers (29)
  • Dry winter (14)
    • Reviewer Profile:
    • Homeowner (48), Avid do-it-yourselfer (6)

Reviewed by 55 customers

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3.0

Fine Replacement but...

By HKS

from Saratoga Springs, NY

About Me Homeowner

Verified Buyer

Pros

    Cons

    • Not Durable

    Best Uses

    • Whole House Humidifiers

    Comments about Aprilaire #4655 Humidistat:

    This was easy to replace, and is now working just fine, but I am disappointed that the humidistat needed to be replaced after just 3 years.

     
    5.0

    As Advertised!

    By Andy

    from Lenexa, KS

    About Me Homeowner

    Verified Buyer

    Pros

    • Good Fit

    Cons

      Best Uses

      • Whole House Humidifiers

      Comments about Aprilaire #4655 Humidistat:

      Was the exact product I needed. Arrived as expected and installed easily. Now the whole house humidifier is working perfectly!

       
      5.0

      I definitely recommend!

      By Michael

      from Arvada, Co

      About Me Homeowner

      Verified Buyer

      Pros

        Cons

          Best Uses

          • Whole House Humidifiers

          Comments about Aprilaire #4655 Humidistat:

          Easy to install! Keeps the humidity at a constant 40%.

          I didn't exactly follow the instructions when installing on the intake duct
          of the furnace. The old nonworking humidistat required a smaller opening. I didn't use the supplied template to cut a larger opening. I duct taped the opening shut and then used only two screws (in the top) to mount the 4655 humidistat onto the outside of the intake duct. The bottom of the 4655 humidistat angels out at the bottom allowing air flow.

           
          1.0

          Aprilaire 4655 Humidistat Review

          By tweetsteves

          from Minneapolis, MN

          About Me Homeowner

          Verified Buyer

          Pros

            Cons

            • Not Durable

            Best Uses

            • Whole House Humidifiers

            Comments about Aprilaire #4655 Humidistat:

            This model fails every 2 to 3 years. The new one I just purchased seems to have a new design. Hopefully this one will last longer.

            I like the web site and the order was handled promptly.

             
            4.0

            Works Well So Far.

            By Swamp Fox

            from Monument, CO

            About Me Homeowner

            Verified Buyer

            Pros

            • Constant Humidity
            • Energy Efficient
            • Works well

            Cons

            • Doesn't Fit

            Best Uses

            • Whole House Humidifiers

            Comments about Aprilaire #4655 Humidistat:

            I have only had it installed a couple of weeks, but so far, so good. Back to a very comfortable house in a cold, dry climate. I knew it would be smaller than the original and the hole in the return would be too large. I just removed the humidistat from the frame and put it in the old frame. In warm weather, I can do the sheet metal repair so that the new frame will fit perfectly.

             
            5.0

            I received exactly what I ordered

            By Bogeyman

            from Wichita kansas

            Verified Buyer

            Comments about Aprilaire #4655 Humidistat:

            My original humidistat failed and purchased this as a replacement. I received this in a matter of days and took about 5 minutes to install. This was the same unit that was recommended by my hvac company I use for service. It cost less than half the price I was going yo pay locally. I will definitely buy from here in the future! I would recommend to anyone

             
            4.0

            Surprisingly accurant !

            By Doug

            from Lancaster PA

            About Me Homeowner

            Verified Buyer

            Pros

            • Good Replacement

            Cons

              Best Uses

              • Whole House Humidifiers

              Comments about Aprilaire #4655 Humidistat:

              Replaced a failing humidifier control for our furnace -- New one was a good replacement and looked exactly like the original; and it fit perfectly in the opening in the air duct.

              (1 of 1 customers found this review helpful)

               
              5.0

              Worked perfectly!

              By NotHandyPeopleByAnyStretch

              from Madison, WI

              About Me Homeowner

              Verified Buyer

              Pros

                Cons

                  Best Uses

                  • Whole House Humidifiers

                  Comments about Aprilaire #4655 Humidistat:

                  We bought this to replace an old gold humidistat that was probably from the 80s or earlier. The knob on the old unit was broken off and couldn't be repaired. The new unit is slightly bigger but we made it fit. It took us a long time to figure out that the two posts for wires simply made a circuit and there wasn't a positive or negative. Either that or we got lucky with the first combination we tired. At any rate, once we finished deliberating about positive and negative posts, it took about 10 minutes to install it. It probably would go faster if someone with ANY amount of experience was doing it. But, we managed to get it on and running and not electrocute ourselves, so it's a win!

                  (1 of 2 customers found this review helpful)

                   
                  4.0

                  Simple-good product

                  By tom

                  from pa

                  About Me Homeowner

                  Verified Buyer

                  Pros

                    Cons

                    • Doesn't Fit

                    Best Uses

                    • Whole House Humidifiers

                    Comments about Aprilaire #4655 Humidistat:

                    Had to make a metal back plate to fit the existing hole. Saw that a back plate used to be offered but no longer available. Easy wiring job. Talked to tech support-very helpful. Would buy again

                     
                    5.0

                    Perfect Replacement

                    By drmikeb

                    from Summit, NJ

                    About Me Homeowner

                    Verified Buyer

                    Pros

                    • Fast Easy Replacement
                    • Works Fine

                    Cons

                      Best Uses

                        Comments about Aprilaire #4655 Humidistat:

                        Original humidistat died after 10 years. This OEM replacement was very good price, works fine. Some minor duct cutting required from original.

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