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Aprilaire 112 - page 1
READ AND SA VE THESE INSTRUCTIONS Includes Safety , Operating and Maintenance Instructions and W arranty T ABLE OF CONTENTS PAGE Introduction ................................................Inside Front Cover Principle of Operation ............................................................1 Operating Instructions •Automatic Humidifier Control.. ...
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Aprilaire 112 - page 2
W ARNING! 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. T urn humidistat or Automatic Humidifier Control, to “OFF” or lowest setting before servicing Replacement Water Panel evaporators are available from your ...
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Aprilaire 112 - page 3
I. PRINCIPLE OF OPERA TION 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 pr oper r elative humidity all during the heating season. It is very possible that you have questions concerning your new humidifie ...
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Aprilaire 112 - page 4
- 2 - not trapped by the replaceable W ater Panel evaporator are flushed down the drain. 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. There ar e some homes wher e drain facilities are not accessi- ble or available. For these situations ...
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Aprilaire 112 - page 5
II. OPERA TING INSTRUCTIONS Automatic Humidifier Control: (Manual humidistat-see pg 5) Your Automatic Humidifier Control is installed in the cold air return. During the first heating season, your Automatic Humidifier Control needs to be set initially to match your home’s condition. Please follow these steps when adjusting your control (refer to F ...
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Aprilaire 112 - page 6
Your Aprilaire Automatic Humidifier, is a high precision system that will accurately maintain the relative humidity in your home. For every 1º change in outdoor temperature, the control will automatically adjust the indoor relative humidity (RH) by 1 ⁄ 2 %. If you would like to determine the RH in your home, follow these steps: 1. Determine the ...
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Aprilaire 112 - page 7
- 5 - Manual Humidistat: (Automatic Humidifier Control – see pg 3) Y our new Aprilaire Humidifier is controlled by a humidistat installed either in the living area or in the cold air r eturn. It is important to anticipate a drop in outdoor temperatur e and reduce the setting accordingly to avoid excessive condensation. For example, with an outdoo ...
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Aprilaire 112 - page 8
- 6 - T o check the humidifier operation, set the humidistat above the click point, make sure that the water saddle valve is open and that there is electricity to the unit. Generally , with all models except the 350 and 360 Aprilaire Humidifiers, the furnace blower motor must be operating for the Aprilaire Humidifier to function. After the humidifi ...
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Aprilaire 112 - page 9
- 7 - either case, the W ater Panel evaporator is usually changed once a year . In the Models 448 and 445 Aprilaire Humidifiers, these solids will build up on the evaporator surface, in the reservoir and pump section. This is why proper maintenance is important and necessary . Service hot water , 140 ° maximum, is recom- mended with drain type uni ...
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Aprilaire 112 - page 10
- 8 - Inspection and Service Instructions 1. Disconnect electrical power to the furnace and shut off water supply. 2. Disconnect the water line at the inlet com- pression nut. 3. Remove the in-line strainer from inside the inlet fitting by using a small nail or wire. 4. Flush the in-line strainer clean or replace with a new strainer, Service Depart ...
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Aprilaire 112 - page 11
- 9 - MODELS 558-550-568-560 1. Note humidistat or control setting and turn dial to the “ OFF ” position. 2. Turn off water supply. 3. At the side of the unit opposite the airflow duct pull front cover (1) off hold- ing with both hands and set aside. 4. Carefully pull the plastic feed tube (2) out of the nozzle (3) at the top of the Water Panel ...
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Aprilaire 112 - page 12
- 10 - MODELS 768-760 1. Note humidistat or control setting and turn dial to the “ OFF ” position. 2. Disconnect electrical power and turn off water supply. 3. Unlatch humidifier cover assembly (1) from base assembly (2) at the bottom of the cover, lift, and set aside. 4. Pull out the evaporative assembly (3) by grasping at the top and tipping ...
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Aprilaire 112 - page 13
MODELS 440-448-445 MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 440 CAUTION! Sudden operation may cause personal injury or property damage. Turn humidistat to “off” or lowest setting before servicing. 1. Note humidistat setting and turn dial to the “ Off ” position. 2. Remove two aluminum knobs (1), swing up and remove top cover ...
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Aprilaire 112 - page 14
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 replace reservoir liner. Reinstall partition in liner. To replace reservoir, hook back of reservoir over lip of dark metal fr ...
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Aprilaire 112 - page 15
- 13- 1. Disconnect electrical power and turn off water supply. 2. Remove screws of the inlet grille (1). The grille can now be removed from the metal housing (8). 3. Lift the complete plastic framed evaporative section out of the humidifier housing. 4. To remove the distribution tray (2) from evaporative assembly (9), push down on tray and pull ou ...
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Aprilaire 112 - page 16
- 14 - MODELS 110-112 1. Disconnect electrical power and turn off water supply. 2. Disconnect: a) 120 volt electrical service. b) Copper water supply line (1) & feed tube (2). c) Drain line. d) 24 volt leads. 3. Turn two swing locks (3), one at either side of lower housing off humidifier flange. 4. Lift humidifier straight up until bottom of un ...
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Aprilaire 112 - page 17
- 15 - MODEL 220-224 1. Turn off water supply and turn down humidistat. 2. Remove three “ Z ” clips (1) that hold top half of unit to furnace plenum. 3. Slide off four closure clips (2 & 3) that hold two halves of unit together. 4. Loosen compression fitting (4) on copper feed tube (6) and remove. 5. Remove top screw holding sheet metal elb ...
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Aprilaire 112 - page 18
- 16 - LIMITED WARRANTY Your Research Products Corporation Aprilaire ® Humidifier unit is expressly warranted for one (1) year from date of instal- lation 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. Research Products Corporation ’ s exc ...
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Aprilaire 112 - page 19
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 y ...
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Aprilaire 112 - page 20
SERVICE AND WA TER P ANEL REPLACEMENT RECORD Date Dealer Name DP #10003882 5.9.00 Printed in U.S.A. P.O. BOX 1467 • MADISON, WI 53701-1467 Products For Better Indoor Air Quality ™ ...
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