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Humidifiers
Owner's Manual
For Models 400, 500, 600 & 700
Includes Safety & Operating Instructions
and Warranty Information
READ AND SAVE THESE INSTRUCTIONS

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Questions and answers

Russell Franklin Zimmerman
January 20, 2025

WATER IS OVERFLOWING THE FILTER AN COMING ONTO THE FLOOR, TRIED SWITCHING WIRES ON THE CONTROL AN NOT WORKING. I CAN ONLY SET IT ON #1 WITHOUT IT OVERFLOWING.

1 comments:
Mr. Anderson
February 4, 2025

The Aprilaire 600 filter may overflow and cause water to come onto the floor due to blockages or malfunctions. Specifically, issues like the water panel collapsing, deforming, or disintegrating can block the drain, leading to water pooling and spilling onto the floor. Additionally, improper maintenance or mineral buildup could exacerbate the problem by restricting water flow or causing leaks.

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Robert Boyer
February 6, 2025

My 600 series Humidifier drips water constantly!!very frustrating. The plastic hose does not fit tightly in the opening provided. Water constantly drips our around the tube to the floor below. the tub doesn't fit tightly!!

1 comments:
Mr. Anderson
February 10, 2025

If the Aprilaire 600 series humidifier is dripping water constantly around the plastic hose, it may be due to an old or faulty distribution tube. If the humidifier is more than five years old, the distribution tube may need replacement. A worn-out tube can cause excessive water usage and potential leaks. Replacing the tube involves disconnecting it from the solenoid valve and the top clip, then sliding in a new one with a new ferrule nut and ferrule ring.

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Summary of Contents for Aprilaire 600

  • Page 1 Humidifiers Owner’s Manual For Models 400, 500, 600 & 700 Includes Safety & Operating Instructions and Warranty Information READ AND SAVE THESE INSTRUCTIONS...
  • Page 2: Table Of Contents

    ® business and are pleased to add your name to our growing list of customers. You have invested in the highest quality equipment available. Aprilaire manufactures whole-house indoor air quality products and is a recognized leader in the heating and air conditioning industry.
  • Page 3: Principle Of Operation

    The operating principle of your Aprilaire humidifier provides all of these advantages. Here, briefly, is the method: The Aprilaire Humidifier is installed to operate in conjunction with the furnace blower motor. When the Aprilaire Humidifier Control calls for humidity and the blower motor is operating, water flows to the distribution tray located at the top of the humidifier.
  • Page 4 Trouble-free performance and minimum maintenance are assured by the design features of the Aprilaire Humidifier. All humidifier 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 5: Operating Instructions - Models 400, 600 & 700

    TABLE OF CONTENTS OPERATING INSTRUCTIONS – MODELS 400, 600 & 700 There are 2 possible modes of operation of your Aprilaire Humidifier Control – Automatic and Manual. An explanation of both modes follows: Automatic Mode: (Manual Mode-see pg 5) Your Aprilaire Humidifier Control is installed in the cold air return duct.
  • Page 6 Aprilaire Humidifier. 90-1054 Your Aprilaire Automatic Humidifier is a high precision system that will accurately maintain the relative humidity in your home to a maximum of 45% RH and a minimum of 10% RH. For every 1°F change in outdoor...
  • Page 7: Manual Mode

    90-1080 Manual Mode: (Automatic Mode – see page 3) 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. For example, with an outdoor temperature of 20°F the correct setting will be 35% relative humidity.
  • Page 8 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. In addition, at this setting, the humidifier will only operate for 1 minute.
  • Page 9: Operating Instructions - Model 500

    TABLE OF CONTENTS OPERATING INSTRUCTIONS – MODEL 500 Your new Aprilaire Humidifier is controlled by a manual humidistat installed either in the living area or in the cold air return. It is important to anticipate a drop in temperature and reduce the setting accordingly to avoid excessive condensation.
  • Page 10: Annual Maintenance

    TABLE OF CONTENTS ANNUAL MAINTENANCE For best performance, we recommend that you replace the Water Panel evaporator in your Aprilaire Humidifier at least annually with the exception of Model 400 which should be changed twice per heating season. If you have a Humidifier Control equipped with a “Change Water Panel”...
  • Page 11: Periodic Preventative Maintenance

    TABLE OF CONTENTS PERIODIC PREVENTATIVE MAINTENANCE NOTE: Periodic inspection and preventative 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 a water delivery system that includes a water feed tube, in-line water strainer and orifice as shown below.
  • Page 12: Model 400

    Replace tube if it is cracked, brittle, or has been damaged. 9. Slide a new Aprilaire No. 45 Water Panel (7) into the scale control insert/float chamber (8). Snap the distribution tray (5) back on the scale control insert (8).
  • Page 13: Model 500

    Replace the Water Panel evaporator (Stock No. 35 for Model 600 and Stock No. 10 for Model 500) with a new Genuine Aprilaire Water Panel. Slide the Water Panel back into the scale control insert with the colored spot up and snap the distribution tray (5) back into place.
  • Page 14: Model 700

    Replace the Water Panel evaporator (Stock No. 35) with a new Genuine Aprilaire Water Panel. 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 15: Limited Warranty

    TABLE OF CONTENTS 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 16: Thank You

    TABLE OF CONTENTS WARRANTY REGISTRATION 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 installation to: Research Products Corporation, P.O. BOX 1828, Madison, WI 53701 Your Warranty Registration information will not be sold or shared outside of this company.

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