Aprilaire 1820 User Manual

Model 1820 Dehumidifier

Owner’s Manual

PLEASE LEAVE THIS MANUAL WITH THE HOMEOWNER

Installed by: _________________________________ Installer Phone: _______________________ Date Installed: _______________

ON/ OFF button

used to turn

dehumidifier on

and off

MODE button

used for optional

ventilation feature

Up/ Down

buttons used to

change humidity

setting

Dehumidifer Control

Inlet Filter Access

Door

Outlet

Drain Power

Switch

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CRAWL SPACE DEHUMIDIFICATION

The Aprilaire® dehumidifier controls the humidity level in your crawl space. A powerful blower inside the dehumidifier draws air into the
cabinet, filters the air and removes moisture, then discharges the dry air into the crawl space. Inside the cabinet, a sealed refrigeration system
removes moisture by moving the air through a series of tubes and fins that are kept colder than the dew point of the incoming air. The dew
point is the temperature at which moisture in the air will condense, much like what occurs on the outside of a cold glass on a hot summer
day. The condensed moisture drips into the dehumidifier drain pan to a drain tube routed to the nearest floor drain or condensate pump. After
the moisture is removed, the air moves through a second coil where it is reheated before being sent back into the space. The air leaving the
dehumidifier will be warmer and drier than the air entering the dehumidifier.

SETTING THE DESIRED HUMIDITY LEVEL

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The dehumidifier on-board control will display the humidity setting when not running, and displays
the measured humidity when running.

The UP and DOWN arrow buttons allow the humidity level to be set from 40% to 80% relative
humidity. Use the ON/OFF button to turn the dehumidifier ON or OFF.

Set the control at 59%RH when first installed. Allow the dehumidifier to run until it reaches the
setting before deciding if you want to change the setting.

• If you prefer the air to be more dry, decrease the humidity setting.

• If you prefer the air to be less dry, increase the humidity setting.

HOW DOES THE DEHUMIDIFIER WORK?

Once per hour the dehumidifier will measure the humidity level of the air and compare it to the humidity setting. If the humidity in your crawl
space is higher than the setting, the dehumidifier will dehumidify the air until the humidity level drops 3%RH below the setting.

When the dehumidifier turns on, the blower circulates the air for 3 minutes before measuring the
humidity level of the air. The on-board control will display AIR SAMPLING, along with the measured
humidity on the control screen.

If the humidity of the air is higher than the setting, the compressor turns on and the control will display
DEHUMIDIFYING, along with the measured humidity on the control screen.

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EXTERNAL CONTROL OPTIONS

Your Aprilaire dehumidifier can be controlled with an optional Aprilaire Model 76 Control. Install the
Model 76 in your living space and make changes to the dehumidifier setting or find out what the humidity
level is in the crawl space from the comfort and convenience of the living space. Refer to the Model 76
Owner’s Manual for operating instructions. Aprilaire owner’s manuals are available at www.aprilaire.com.

If you are interested in having an external control installed, please consult your installing contractor.

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Model 76 Control

MAINTENANCE

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CLEAN OR REPLACE THE AIR FILTER

After initial installation the air filter should be checked and cleaned every 6 months. The CLEAN
FILTER service reminder will display on the on-board control screen every 6 months. To clear the
service message, press the UP and DOWN arrows simultaneously for 3 seconds.

Filter Cleaning Procedure

1. Turn the ON/OFF switch OFF.

2. Remove the filter access door from either side of the dehumidifier.

3. Slide the filter out of the dehumidifier.

4. Flush the filter with warm water and a mild detergent solution.

5. Shake off the excess water from the filter.

6. Replace the filter, making sure the filter is secured in both the top and bottom filter rails.

7. Replace the filter access door.

8. Turn the ON/OFF switch ON.

9. Press the UP and DOWN buttons simultaneously for 3 seconds to clear the service message.

CHECK THE DRAIN

The drain should be checked annually to ensure there are no blockages or air lock in the drain system. If the unit is not draining properly, have it
checked by a qualified service professional.

CAUTION

Do not use spray solvents or cleaners on or near the inlet side of the dehumidifier.

If desired, apply cleaner to a cloth and use to clean the cabinet.

TROUBLESHOOTING

DIAGNOSTIC CODES

The on-board control will display a diagnostic code if an error should occur and service is required.
Contact your installing contractor if E1– E7 or E9 is displayed on the on-board control screen. E8 will be
displayed if the incoming air temperature is below 50°F, above 104°F, or when the dew point is below
40°F. When the incoming air is within the acceptable range, the dehumidifier will resume operation.
If the error persists, contact your installing contractor.

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LIMITED WARRANTY

Your Research Products Corporation Aprilaire® Dehumidifier is expressly warranted for five (5) years from date of installation to be free from defects in materials or workmanship.

Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a replacement for any component which is found to be defective within such
five (5) year period and which is returned not later than thirty (30) days after said five (5) year period by you to either your original supplier or to Research Products Corporation, Madison,
Wisconsin 53701, together with the model number and installation date of the dehumidifier.

THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS
FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE DEHUMIDIFIER ITSELF.

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID FIVE YEAR PERIOD. RESEARCH
PRODUCTS CORPORATION’S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE
AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE
THIS UNIT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR. IF THE LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR,
ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION.

Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above exclusion or limitations
may not apply to you.

This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

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, email address, product purchased, model number, date of purchase and dealer name and address to:

Research Products Corporation, P.O. Box 1467, Madison, WI 53701

Your Warranty Registration information will not be sold or shared outside of this company.

10012342 7.17
B2207620A

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P.O. Box 1467 • Madison, WI 53701-1467 • Phone: [phone] • Fax: [phone] • www.aprilaire.com

Printed in U.S.A.

© 2017 Aprilaire – A division of Research Products Corporation

Model 1820 Dehumidifier

Installation Instructions

SAFETY INSTRUCTIONS

WARNING

1. 120 Volts may cause serious injury from electric shock. Disconnect electrical power before starting installation or servicing.
Leave power disconnected until installation/service is completed.

2. Sharp edges may cause serious injury from cuts. Use care when cutting plenum openings and handling duct work.

3. Dropping may cause personal injury or equipment damage. Handle with care and follow installation instructions.

CAUTION

1. Read all instructions before beginning installation.

2. Improper installation may cause property damage or injury. Installation, service, and maintenance must be performed by a
qualified service technician.

3. Do not use in pool applications. Pool chemicals can damage the dehumidifier.

4. Do not use solvents or cleaners on or near the circuit board. Chemicals can damage circuit board components.

5. Wait 24 hours before running the unit if it was not shipped or stored in the upright position

TABLE OF CONTENTS

Safety Instructions........................................1

Specifications............................................2

Set Up Dehumidifier for Installation ........................2

Packaging Content .......................................2

Duct Collars ............................................2

Location Considerations...................................3

Installation...............................................3

Leveling ...............................................3

Ductwork Installation.....................................3

Drain Tubing and Condensate Pump Installation ...............4

Model 76 – Crawl Space Control and Wiring ................5

READ AND SAVE THESE INSTRUCTIONS

Air Cycling...............................................5

System Set-Up, Check & Start-Up ..........................6

Remote Control – Crawl Space.............................6

Ventilation / Air Cycling...................................7

System Check...........................................7

Crawl Space Using the Dehumidifier Control..................8

Crawl Space Remote Control Using Model 76 .................8

Start-Up ...............................................8

Troubleshooting ..........................................9

Table 1 – Diagnostic Codes ................................9

Table 2 – Troubleshooting Guide...........................10

Service Parts............................................11

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