Aprilaire 550 Owner's Manual
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Aprilaire 550 Owner's Manual

Aprilaire automatic humidifiers owner's manual
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See also: Service Manual
Automatic Humidifiers
Owner's Manual
For Models 400, 550, 600 & 700
Includes Safety & Operating Instructions
and Warranty Information
READ AND SAVE THESE INSTRUCTIONS

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Questions and answers

Terry Narine
February 3, 2025

I have an older Aprilaire 550. It's leaking at the bottom of the unit. I have changed the panel and cleaned out the distribution tray. But this hasn't stopped the leaking. The unit doesn't appear to come with any sort of water sensor float. Looking for a solution.

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1 comments:
Mr. Anderson
February 10, 2025

Possible solutions for a leaking Aprilaire 550 unit after changing the panel and cleaning the distribution tray include:

1. Check Water Panel Orientation – Ensure the new water panel is installed correctly with the colored spot facing up.
2. Inspect the Scale Control Insert – Clean any calcium buildup and ensure it is properly seated.
3. Verify Proper Assembly – Ensure all components, including the distribution tray and feed tube, are securely in place.
4. Examine the Drain Hose – Remove, flex, and flush it to clear any blockages before reattaching.
5. Check for Excess Buildup – Clean out any remaining mineral deposits that could be causing overflow.
6. Ensure Even Water Flow – The textured surface of the water panel should be correctly positioned to distribute water evenly.

If the issue persists, further inspection of the feed nozzle and strainer screen may be necessary.

This answer is automatically generated

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Summary of Contents for Aprilaire 550

  • Page 1 Automatic Humidifiers Owner’s Manual For Models 400, 550, 600 & 700 Includes Safety & Operating Instructions and Warranty Information READ AND SAVE THESE INSTRUCTIONS...

  • Page 2: Table Of Contents

    • Manual Mode ......... .6 Operating Instructions – Model 550 ......8 Effect of Water Characteristics .

  • Page 3: Introduction

    However, if you still have difficulty in obtaining a replacement Water Panel evaporator, use the dealer locator in our web site (www.aprilaire.com) or look in the Yellow Pages under Humidifying Apparatus or Heating & Air Conditioning Contractors. Purchase only genuine Aprilaire Water Panels to maintain performance.

  • Page 4: Principle Of Operation

    It is designed to be completely opened or closed. The minerals and solid residue not trapped by the replaceable Water Panel evaporator are flushed down the drain. In the Models 550, 600 and 700. The drain also eliminates the problems caused by stagnant water. This is the most effective and least expensive method to dispose of trouble-causing minerals.
  • Page 5 Aprilaire Humidifier under most operating conditions, has this humidifying capacity. Trouble-free performance and minimum maintenance are assured by the design features of the Aprilaire Humidifier. All unit housing parts that come in contact with water are non-metal and will never rust or corrode. Neither heat nor water will affect them under normal operating conditions.

  • Page 6: Operating Instructions - Model 400, 600 & 700

    Control – Automatic and Manual. An explanation of both modes follows: Automatic Mode: (Manual Mode-see pg 6) Your Aprilaire Humidifier Control is installed in the cold air return duct. During the first heating season, your Humidifier Control needs to be set initially to match your home’s condition.
  • Page 7 Aprilaire Humidifier. Your Aprilaire Automatic Humidifier, is a high precision system that will accurately maintain the relative humidity in your home. For every 1° change in outdoor temperature, the control will automatically adjust the...

  • Page 8: Relative Humidity

    “5” on the dial range, then the RH in your home is 35%. Manual Mode: (Automatic Mode – see pg 4) Your Aprilaire Humidifier Control is installed in the cold air return. It is important to anticipate a drop in outdoor temperature and reduce the setting accordingly to avoid excessive condensation.
  • Page 9 The furnace blower motor must be operating and the furnace calling for heat for the Aprilaire Humidifier to function. Note: Turning the knob to “Test/Reset” resets the “Change Water Panel” internal timer. After the...

  • Page 10: Operating Instructions - Model 550

    On occasion, indoor moisture producing activities such as clothes drying, cooking, showers, etc., may raise the relative humidity level higher than it should be, even though the Aprilaire Humidifier is not operating. Telltale indications, again, are condensation or frost on cold surfaces such as windows, doors, walls, etc.

  • Page 11: Annual Maintenance

    1. For Models 400, and 600 close the bypass damper which is a part of the unit, with the use of the small damper handle. For the Model 550, close the bypass damper which is installed in the bypass pipe.

  • Page 12: Periodic Preventative Maintenance

    VIII. PERIODIC PREVENTATIVE MAINTENANCE NOTE: Periodic inspection and preventive maintenance of your total heating system is important for efficient and safe operation. Your heating contractor should include humidifier service at the same time. All models are equipped with an in-line water strainer and orifice as shown below.

  • Page 13: Maintenance Instructions

    8. Slide a new Aprilaire no. 45 water panel into the scale control insert/float chamber. Snap the distribution tray back on the scale control insert.

  • Page 14: Model 600

    Inspect Water Panel evaporator (Stock No. 35 for Model 600) and substitute a new Genuine Aprilaire Water Panel if necessary. Slide the Water Panel back into the scale control insert with the colored spot up and snap the distribution tray back into place.

  • Page 15: Model 700

    Inspect the Water Panel evaporator (Stock No. 35) and replace with a new Genuine Aprilaire Water Panel if necessary. Slide the Water Panel evaporator back into the scale control insert with the colored spot up and snap the distribution tray (4) back into place.

  • Page 16: Model 550

    Inspect the Water Panel evaporator (Stock No. 10 for Model 550) and substitute a new one if necessary. Slide the pad back into the insert frame with color mark up and snap the distributor tray back into place.

  • Page 17: Limited Warranty

    LIMITED WARRANTY Your Research Products Corporation Aprilaire Humidifier unit is ® expressly warranted for one (1) year from date of installation to be free from defects except, however, for the disposable Water Panel which will have to be replaced from time to time depending upon the amount of use.
  • Page 18 For the best in indoor air quality, ask your heating and cooling contractor about these fine Aprilaire products, or visit us at www.aprilaire.com to solve your Indoor Air Comfort needs. Aprilaire ®...

  • Page 19: Replacement Record

    SERVICE AND WATER PANEL REPLACEMENT RECORD Date Dealer Name - 17 -...

  • Page 20: Research Products Corporation

    WARRANTY REGISTRATION Please… Take a few minutes to visit us on-line at www.aprilaire.com to register your Aprilaire product. If you do not have on-line access, please mail a postcard with your name, address, phone number, product purchased and date of purchase to: Research Products Corporation P.O.

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