READ AND SAVE THESE INSTRUCTIONS ® AUTOMATIC HUMIDIFIER The Best Cure For Dryness® OWNER’S MANUAL FOR MODELS 448, 558, 568, 600, & 700 Includes Safety, Operating and Maintenance Instructions and Warranty TABLE OF CONTENTS PAGE Introduction ................................................Inside Front Cover Principle of Operation ............................................................1 Operating Instructions •Automatic Mode................................................................
WARNING! 120 volts may cause injury from electrical shock. Disconnect power and shut off water supply before servicing. CAUTION! Sudden operation may cause personal injury or property damage. Turn the Aprilaire Humidifier Control to “OFF” or lowest setting before servicing INTRODUCTION Thank you for your recent Aprilaire Humidifier purchase. We sincerely appreciate your business and are pleased to add your name to our growing list of customers.
I. PRINCIPLE OF OPERATION With your purchase of a humidification system, you have invested in a humidifier that operates on the evaporative principle – nature’s own way of adding moisture – and will provide the proper relative humidity all during the heating season. It is very possible that you have questions concerning your new humidifier – questions on what it can do for you, and what you should do to receive maximum benefits from it. This booklet is intended to help you do exactly that.
There are some homes where drain facilities are not accessible or available. For these situations, or where high water hardness is not a problem, specially designed Aprilaire Humidifiers, Models 448 and 445, are available, incorporating a water recirculating system. Capacity is high because an average-size home (10,000 cu. ft.) requires the addition of approximately 9 gallons of water per day to maintain 35% relative humidity when the outside temperature is 20°.
II. OPERATING INSTRUCTIONS There are 2 possible modes of operation of your Aprilaire Humidifier Control and an explanation of both modes follows: Automatic Mode: (Manual Mode-see pg 5) Your Aprilaire Humidifier Control is installed in the cold air return. During the first heating season, your Humidifier Control needs to be set initially to match your home’s condition. Please follow these steps when adjusting your control (refer to Figure A). 1.
(Figure A) 7 6 5 s Te t NOR MA L The relative humidity in your home will now be accurately controlled to meet your needs and should not need further adjustment during future heating seasons. Make note of the dial setting in the event you temporarily move the knob when performing annual maintenance of the Aprilaire Humidifier 4 Off 3 2 1 Humidity Level Your Aprilaire Automatic Humidifier, is a high precision system that will accurately maintain the relative humidity in your home.
(Table 2) % Relative Humidity Guide Dial Setting Outdoor Temperature (ºF) -10 0 10 20 30 40 1 10 10 10 15 20 25 2 10 10 15 20 25 30 3 10 15 20 25 30 35 4 15 20 25 30 35 40 5 20 25 30 35 40 45 6 25 30 35 40 45 45 7 30 35 40 45 45 45 As an example, if the outdoor temperature is 20º F, and, following step 3, the humidifier turns off at “5” on the dial range, then the RH in your home is 35%.
(Table 3) Outdoor-Indoor Relative Humidity Outside Temperature Recommended RH +40° 45% +30° 40% +20° 35% +10° 30% 0° 25% –10° 20% –20° 15% The humidistat is a precision instrument that can be used to determine the RH accurately in your home during the winter. Turn the dial to the lower setting, then reverse the dial direction slowly until you hear the solenoid valve “click on”. At this point, read the RH on the dial. This will be very close to the actual RH in your home.
Additional Information Be sure to keep fireplace dampers closed when not in use. They provide an excellent escape route for heat, as well as humidity. Humidity is lost at an even faster rate than heat because water vapor tends to seek its own level and your humidifier would not be able to replace it even when running at full capacity. On occasion, indoor moisture producing activities such as clothes drying, cooking, showers, etc.
IV. ANNUAL MAINTENANCE For best performance, we recommend that you replace the water panel evaporator in your Aprilaire Humidifier annually. • Call the installer of your Aprilaire Humidifier. This information is often found on your equipment. • Call your heating and air conditioning dealer. • Use our “Dealer Locator” at: www.aprilaire.com • Look in the Yellow Pages under Humidifying Apparatus or Heating & Air Conditioner Contractors.
Inspection and Service Instructions OUTLET COMPRESSION NUT ORIFICE SOLENOID VALVE INLET IN-LINE STRAINER INLET COMPRESSION NUT 1. Disconnect electrical power to the furnace and shut off water supply. 2. Disconnect the water line at the inlet compression nut. 3. Remove the in-line strainer from inside the inlet side of the valve by using a small nail or wire. 4. Flush the in-line strainer clean or replace with a new strainer, Service Department, Part No. 4004. 5.
MODEL 448 MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 448 WARNING! 120 volts may cause serious injury from electrical shock. Disconnect power and shut off water supply before servicing. 5 2 3 4 1 1 1. 2. 3. 4. 5. Cover Knob Top Cover Feed Nozzle Distribution Tray Metal Frame MODEL 448 1. Note humidistat or control setting and turn dial to the “Off” position. 2. Disconnect electrical power and turn off water supply. 3.
MAINTENANCE INSTRUCTIONS FOR MODELS 448 RESERVOIR PUMP SECTIONS WARNING! 120 volts may cause serious injury from electrical shock. Disconnect power and shut off water supply before servicing. IMPORTANT: Clean and refill reservoir, hose, pump and float every 30 days during heating season. 1. 2. 3. 4. Pump Impellor Cap Cap Sides Impellor Cap Flow Control Opening 5. Float 6. Arm Mechanism 3 2 2 5 4 6 1 A. TO CLEAN RESERVOIR 1. Hold bottom of reservoir (IT IS FILLED WITH WATER) and loosen retainer knob.
MODELS 558-568 MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODELS 558-568 CAUTION! Sudden operation may cause personal injury or property damage. Turn humidistat or control to “off” or lowest setting before servicing. 3 5 6 1 4 8 7 2 1. 2. 3. 4. 9 5. 6. 7. 8. 9. Front Cover Feed Tube Nozzle Water Panel Evaporative Assembly Distribution Tray ”V” Notches Water Panel Scale Control Insert Drain Hose 1. Note humidistat or control setting and turn dial to the “OFF” position. 2.
MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 600 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. MODEL 600 CAUTION! Sudden operation may cause personal injury or property damage. Turn humidistat or control to “off” or lowest setting before servicing. Front Cover Feed Tube Nozzle Water Panel Evaporative Assembly Distribution Tray “V” Notches Water Panel Scale Control Insert Drain Hose Integral Damper 1. Note humidistat or control setting and turn dial to the “OFF” position. 2. Turn off water supply. 3.
MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 700 MODEL 700 WARNING! 120 volts may cause serious injury from electrical shock. Disconnect power and shut off water supply before servicing. 5 3 1 1. 2. 3. 4. 5. 6. 7. 8. 9. Front Cover Base Water Panel Distribution Tray ”V” Notches Water Panel Scale Control Insert Drain Hose Power Cord 4 6 7 2 8 9 1. Note humidistat or control setting and turn dial to the “OFF” position. 2. Disconnect electrical power and turn off water supply. 3.
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.
® THE BEST IN INDOOR AIR COMFORT The Aprilaire Indoor Air Comfort System is an integrated group of air quality enhancement products designed to work with your heating and cooling system to make your home more comfortable. 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.
SERVICE AND WATER PANEL REPLACEMENT RECORD Date Dealer Name
P.O. BOX 1467 • MADISON, WI 53701-1467 Products For Better Indoor Air Quality™ DP #10005406 Printed in U.S.A.
