Aprilaire 448 manual

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 Mode................[...]

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 the Aprilaire Humidifier Contr ol to “OFF” or lowest setting before servicing Genuine Replacement Water Panel evaporators are available from your i[...]

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 proper relative humidity all during the heating season. It is very possible that you have questions concerning your new humidifier ?[...]

- 2 - 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 a[...]

II. OPERA TING 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 Contr ol needs to be set initially to match [...]

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 ou[...]

- 5 - Manual Mode: (Automatic Mode – see pg 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 exam- ple, with an outdoor temperature of 20° the correct setting will be 35% relative humidity. [...]

- 6 - To check the humidifier operation, set the knob to “test”, make sure that the water saddle valve is open and that there is electricity to the unit. Generally, the furnace blower motor must be operating for the Aprilaire Humidifier to function. After the humidifier has oper- ated for one minute and water is entering the unit and coming out[...]

- 7 - 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 occa[...]

- 8 - IV . ANNUAL MAINTENANCE For best performance, we recommend that you r eplace 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.apri[...]

- 9 - Inspection and Service Instructions 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, Servic[...]

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. 1. Note humidistat or control setting and turn dial to the “Off” position. 2. Disconnect electrical power and turn off water supply. 3. Remove two a[...]

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 fra[...]

- 12 - 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 evaporative assembly (4[...]

- 13 - 1. Note humidistat or control setting and turn dial to the “OFF” position. 2. Turn off water supply. 3. Press the tabs in the latches on the top and bottom of front cover (1) and pull cover off base with both hands. Set aside. 4. Carefully pull the plastic feed tube (2) out of the nozzle (3) at the top of the Water Panel evaporative asse[...]

4 5 6 7 8 9 1 2 3 - 14 - 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[...]

- 15 - 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 exclu[...]

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[...]

SERVICE AND WA TER P ANEL REPLACEMENT RECORD Date Dealer Name[...]

DP #10005406 Printed in U.S.A. P.O. BOX 1467 • MADISON, WI 53701-1467 Products For Better Indoor Air Quality ™[...]