The smallest 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. The Water Panel evaporator, designed especially for uniform, high evaporation, along with the Scale Control Inser

9. Reinstall the water panel evaporator assembly into the humidifier. Take care not to over- bend the water level sensor assembly. Push the top of the water panel evaporator assembly firmly back until it snaps into place. 10. Push the end of the feed tube back firmly into the distribution tray. Reset the damper to desired position. Replace the front cover. 11. Turn on the water supply. 12. Check system operation: Humidifier Control: (Automatic or Manual) Check system operation and reset change w

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. These parts should be inspected and cleaned periodically to assure continued proper unit performance. INSPECTION AND SERVICE INSTRUCTIONS IN-LINE STRAINER 1. Disconnect electrica

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. With this purchase, you have invested in the highest quality equipment currently available. Research Products

Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 II. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 III. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Installation of External Mount Rooftop Units (Models 1952 & 1953) . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Installation of Internal Mount Rooftop Units (Model 1972) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

For multiple lamps, the reading would be a multiple of this value, i.e., with two lamps installed, the amp reading will be at least 300 mA. f. If the lamp is operating correctly, remove the ammeter from the wiring and put back any access panels that were removed during this procedure. If the lamp is not operating correctly, refer to the ‘Troubleshooting’ section of this manual. Note: If other electrical components or accessories share the same circuit as the UV lamp(s), the current draw will be

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................................................................3 •Manu

Please proceed as shown on page 7 to obtain service parts and/or replacement Water Panel® evaporators. Now, please take a few minutes and read the appropriate section of this booklet. This will familiarize you with the benefits you will receive from the equipment you just purchased and help you understand the routine maintenance that will be required. Be sure to register your warranty with us for our records and your protection. You may do so by returning the Warranty Information Card to us, or

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. Pump Impellor Cap 2. Cap Sides 3. Impellor 4. Cap Flow Control Opening 5. Float 6. Arm Mechanism 6 2 1 3 4 52 A. TO CLEAN RESERVOIR 1. Hold bottom of reservoir (IT IS FILLED WITH WATER) and loosen retainer knob.Carefully lower reservoir, disengaging from metal frame. 2. Empty water, remove partition and reservoir liner. 3. Clean or repla

5. Remove the black plastic distribution tray (5) from the evaporative assembly by unsnapping the white plastic holding strips from the tabs at the end of the tray. Lightly scrape out any calcium deposits and clean the “V” notches (6), but do not scrape off the granular coating from the bottom. This textured surface helps ensure even water flow for maximum performance. See page 2 if removed. 6. Slide the Water Panel evaporator (7) out from the white plastic Scale Control Insert (8). Clean the Sc