Honeywell Home DR90A1000 True Whole House Dehumidifier Installation Guide

DR90A1000
PROFESSIONAL INSTALLATION GUIDE.

NOTE: The DR90A1000 and DR90VPIAQ models are obsolete.

INCLUDED IN THIS BOX

Tools required to install DR90

• 3/8-in. hex drive
• Drill or duct cutting tool
• Wire stripper/cutter
• Standard screwdriver
• Duct tape
• 10-in. round duct and starter collar
• 18-22 gauge, 5 band thermostat wire
• 1/2-in. diameter drain line (8 ft.)
• 1/2-in. drain clamps (2)

Options

• 1/2-in. drain p-trap (may be required by local code)
• Drain pan

| A.DR90 (1)
B.10-in. duct collar (1)
C.6-in. duct collar (1)
D.MERV 11 Filter (1)
E.Filter Door (1)
F.Installation Guide
G1.Prestige Comfort System (wireless)
G2.TruelAQ
G3.H8908 Manual Dehumidistat
G4.VisionPRO IAQ control (included with
DR90VPIAQ)
---|---

Installation Checklist

Included in This Box
A. DR90A1000 (1)
B. 10-in. duct collar (2)
C. 6-in. duct collar (1)
D. MERV 11 Filter (1)
E. Filter Door (1)
F. Installation Guide
Control Options (Sold separately)
G1. Prestige Comfort System
G2. True IAQ
G3. H8908 Manual Dehumidistat
G4. VisionPro IAQ Control (included with DR90VPIAQ)
Tools Required (Not Supplied)

• 3/8-in. hex drive

• Drill or duct cutting tool

•  Wire stripper/cutter

• Standard screwdriver

• Duct tape

• 10-in. round duct and starter collar

• 18-22 gauge, 5 band thermostat wire

• 1/2-in. diameter drain line (8 ft.)

• 1/2-in. drain clamps (2)
  Options

• 1/2-in. drain p-trap (may be required by local code)

• Drain pan

Warning: Installation must be performed by a qualified service technician and must comply with local codes. Remove power to the device before installing or servicing the
device.
Failure to connect the device according to these instructions may result in damage to the device or the controls.

• The DR90 is designed to be installed indoors in a space that is protected from rain and flooding.
• Install the unit with space to access the front panel for maintenance and service.
• Avoid directing the discharge air at people, or over the water in pool areas.
• If used near a pool or spa, be certain there is no chance the unit could fall into the water or be splashed, and that it is plugged into a ground fault interrupt (GFI) outlet.
• To ensure quiet operation, do not place the device directly on the structural supports of the home.
• A drain pan must be placed under the unit if installed above a living area or above an area where water leakage could cause damage.

**?**NEED HELP? For assistance with this product please visit http://customer.resideo.com   or call Customer Care toll-free at 1-800-468-1502.
Read and save these instructions.

About the DR90 Dehumidifier

The DR90 ensures the home is maintained at proper humidity levels through its high performance and efficiency.

Benefits

• Removes up to 90 pints of water per day from the indoor air
• Built-in fresh air supply
• Energy Star Rated

Maintaining Ideal Humidity

Dew points and relative humidity (RH) affect the way your body senses heat. Higher humidity levels cause the air to feel much hotter than the actual temperature. When maintained properly, your cooling equipment may not run as much because dehumidified air feels cooler.
Ideal humidity is defined by industry experts* as being between 40-60% on an average annual basis.

WHAT THE AIR FEELS LIKE
HOW HOT THE HEAT-HUMIDITY COMBINATION MAKES IT FEEL.
EXAMPLE: AIR AT 90ºF WITH 50% RH FEELS LIKE 96ºF TO THE HUMAN BODY!

When indoor humidity exceeds 60%, the home is more susceptible to mold and mildew growth. DR90 safeguards against excessive humidity in the home year- round.
*American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE).

Control Options

The DR90 may be used with one of the following external controls:

| Prestige™ Comfort System
• Controls both heating/cooling and dehumidification.
• Shows actual and desired humidity on an intuitive digital display.
• Wireless sensor for displaying outdoor temperature and humidity.
• Maintenance and service reminders.
• High definition color display.
---|---
| VisionPRO IAQ Total Comfort System (YTH9421C1010)
• Controls both heating/cooling and dehumidification.
• Sensor included for displaying outdoor temperature.
• Intuitive user interface for easy 7-day temperature programming.
• Easy-to-read backlit digital display.
• Maintenance and service reminders.
• Controls other indoor air quality equipment.
| TrueIAQ Digital Control (DG115EZIAQ)
• Automatic adjustments maintain ideal humidity.
• Sensor for displaying outdoor temperature and humidity.
• Shows actual and desired humidity settings.
• Advanced ventilation programming includes economizing and extreme condition shutdown.
• Maintenance and service reminders.
• Controls other indoor air quality equipment.
| Manual Dehumidistat (H8908DSPST) and Automatic Ventilation Controls (W8150A1000)
• Manual humidity control with intuitive comfort settings.
• Integrated humidity chart for accurate control in changing outdoor conditions.
• Automatic W8150 ventilation control to ASHRAE standard, or for continuous operation.

Specifications

Install DR90 according to National Electric Codes.

Home Size (square ft [m])| **Dehumidifier Capacity Required to Maintain Desired Indoor RH*
---|---
60% RH Indoor
(pints/day)| 50% RH Indoor
(pints/day)| 40% RH Indoor
(pints/day)**
2080 (193.2)| 49-54| 55-58| 71-78
2600 (241.5)| 61-68| 65-72| 90-97
3120 (289.9)| 75-82| 79-86| 95-110

• Based on extreme climates where outdoor humidity is 70-90% RH. For less extreme climates, larger homes can be adequately served with less capacity. Actual requirements  may vary.

Dimensions in inches and (mm):

Product weight: 92.2 lbs. (41.8 kg)
Shipping weight: 102 lbs. (46.3 kg)
Shipping dimensions: 21.5 in. H x 18.5 in. W x 40.2 in. L
Media Filter: MERV 11, 13.75 in. H x 13.75 in. W x .75 in. D
Drain connection: 3/4-in. threaded female NPT connection, with attached 3/4-in. male connection.
Duct connections: 10-in. round inlet and outlet. 6-in. supply inlet. ABS plastic, compatible for connection to rigid or flexible ducting with sheet metal screws and/or tape.
Cabinet: 20 gauge galvanized steel powder-coat painted.
Insulation: R value 1
Compressor: Rotary-style, 6.8 KBTU
Refrigerant: R-410A, 1.0 lbs.
Operating Temp Range (outside cabinet): 34ºF to 135ºF (1.1ºC to 57.2ºC)
Operating Humidity Range: 0-99% RH

Airflow versus external static pressure (0–1 in. [0 – 25.4 mm] water pressure) with collars attached

Input ratings

• Electrical input voltage: 120 VAC, 60 Hz nominal
• Input current: 6.7 amps

Output ratings

• Power transformer to R/C terminals: 24 VAC, 0.85 A
•  Energy Performance: 2.5 liters (5.3 pints) per kilowatt hour (KWH)

Standards and approval body requirements
ETL Tested per standard UL 474 ducted dehumidifier.
ENERGY STAR rated.

Install to Fit Your Application

Flex duct is recommended in connecting to the DR90 collars to reduce vibration noise.

Duct Sizing: Use a minimum 10-in. diameter round for duct lengths up to 25 ft. Minimum 12-in. required for lengths longer than 25 ft. Duct branches from the main inlet/exhaust should be minimum of 10-in. round for 2-3 branches, and 12-in. round or larger for 4 branches or more.
For the optional fresh air ventilator port, use 6-in. round, insulated duct for lengths up to 50 ft.
Use 8-in. round duct for more than 50 ft. of if more than 100 CFM is required. Isolated Areas: Effective dehumidification may require ducting to isolated or stagnant air flow areas.

Electrical requirements: 115 VAC outlet. Ground fault interrupter (GFI) recommended.

Main Return to Main Return

Ideal when…

• Running DR90 with A/C operation.
• Minimizing discharge air temperature (DAT) increase is preferred.
• Space dictates.

Main Return to Main Supply

Ideal when…

• Running DR90 opposite A/C operation.
  Running with A/C operation requires a damper on the exhaust port to minimize backdraft when DR90 is not on but A/C is.

• Space dictates.

Dedicated Return to Main Supply

Dedicated Return to Main Return

Ideal when…

• Drying a specific conditioned or unconditioned area, such as attic, basement, or crawl space.
• Running with A/C operation.
• Minimizing DAT is preferred.

Plumbing

Connect 1/2-in. drain tube to male connection drain outlet. Secure drain tube to the connector with a hose clamp.
Run drain hose continuously downhill to an approved drain or condensate pump.

Terminal Description

CAUTION: Low voltage hazard.
Can cause equipment damage.
Disconnect HVAC equipment before beginning installation.

• NOTE: The outer screws on the terminal block secure the block to the chassis. They are not used for wiring.
  A .wiring terminal block is located on the side panel of the unit.
  The four terminals for the terminal block (reading from left to right in the photo) are:
  DHUM: Compressor and fan operation for dehumidification
  R: DR90 24V output
  FAN: Fan activation only for ventilation
  C: DR90 24V output
  External 24V devices can be powered from R and
  C. terminals (20VA max.).

Wiring

Wire the DR90 according to the diagram that applies to your desired operation.

Follow this diagram for ducted operation with external humidity control.

Follow this diagram for ducted operation with external humidity and ventilation control.

Follow this diagram if using DR90 with a powered dehumi distat such as TrueIAQ (DG115EZIQ).

M29842

1. IF A THERMOSTAT OTHER THAN A TH5110, TH5220, TH5320, TH6110, TH6220, TH6320, TH8110, TH8320, OR TH8321 IS USED, A RELAY MAY BE REQUIRED TO ISOLATE THE G WIRE.
2. PROGRAM ISU SETTING 60 TO Ø TO FORCE SYSTEM FAN ON WITH DEHUMIDIFICATION CALL.

Follow this diagram if using DR90 with a VisionPRO IAQ.

Checkout

Apply power to DR90. Turn the humidity control to a low RH% level to initiate a dehumidification call.
Confirm that the DR90 compressor and fan turn on. The furnace blower will also turn on to circulate air. This will take up to two minutes. Be sure to turn the control to the desired RH% or to Off when checkout is complete.

MAINTENANCE

Cleaning

On an annual basis, maintenance is required to ensure DR90 runs at peak efficiency.

1. Unplug DR90 before beginning service.
   Remove the magnetic filter door.

2. Remove filter (50049536-003) and replace with new filter.

3. Remove the panels on each side of the DR90. Using a damp cloth, wipe excess dust and debris from the blower, refrigerant coils, and compressor coils. Reattach cabinet panels when finished.

4. Check the drain connection and drain line to ensure it is clear of debris and sludge. Ensure all hose connections are secure once maintenance of the drain lines is complete.

5. When service is complete, initiate a call for dehumidification and check that the compressor and fan activate. If using the VisionPRO IAQ or TrueIAQ controls, reset maintenance reminders.

Technical Description

DR90 uses a refrigeration system similar to an air conditioner to remove heat and moisture from incoming air and add heat to the air that is discharged. The hot, high-pressure refrigerant gas is routed from the compressor to the condenser coil. The refrigerant is cooled and condensed by giving up its heat to the air that is about to be discharged from the unit. The refrigerant liquid then passes through a filter drier and capillary tubing which causes the refrigerant pressure and temperature to drop. It next enters the evaporator coil where it absorbs heat from the incoming air and evaporates. The evaporator operates in a flooded condition, which means that all the evaporator tubes contain liquid refrigerant during normal operation. A flooded evaporator should maintain nearly constant pressure and temperature across the entire coil, from inlet to outlet.

Troubleshooting

CAUTION: Servicing the DR90 with its high-pressure refrigerant system and high voltage circuitry presents a health hazard that could result in death, serious bodily injury,  and/or property damage. Service should only be performed by a qualified service technician.

No dehumidification. Neither fan nor compressor run and the
The ventilation timer is OFF.| 1. Unit unplugged or no power to the outlet.
2. Humidity control set too high or defective.
3. Loose connection in internal or control wiring.
4. Defective Compressor relay.
5. Defective control transformer.
6. Optional Condensate Pump Safety Switch open.
No dehumidification. Compressor does not run but fan runs when
there is a call for dehumidification and the ventilation control is OFF.| 1.Defective compressor run capacitor.
2. Bad connection in compressor circuit.
3. Defective compressor overload.
4. Defective compressor.
5. Defrost thermostat open.
6. Optional Condensate Pump Safety Switch open.
Defective compressor run capacitor.
2. Bad connection in compressor circuit.
3. Defective compressor overload.
4. Defective compressor.
5. Defrost thermostat open.
6. Optional Condensate Pump Safety Switch open.| 1. Low ambient temperature and/or humidity causing the unit to cycle
through defrost mode.
2. Defective compressor overload.
3. Defective compressor.
4. Defrost thermostat defective.
5. Dirty air filter(s) or airflow restricted.
6. Low refrigerant charge, causing defrost control to cycle.
7. Bad connection in compressor circuit.
Fan does not run with ventilation activated.  Compressor runs briefly
but cycles on & off with humidity control turned to ON.| 1. Loose connection in fan circuit.
2. Obstruction prevents fan rotation.
3. Defective fan.
4. Defective fan relay.
5. Defective fan capacitor.
Evaporator coil frosted continuously, low de-humidifying capacity.| 1. Defrost thermostat lose or defective.
2. Low refrigerant charge.
3. Dirty air filter(s) or airflow restricted.
Unit not providing ventilation.| 1. Check control wire connections (check connections at fresh air damper
also).
2. Defective fresh air damper.
3. Dirty air intake. Clean outside intake hood.
Unit removes some water, but not as much as expected.| 1. Air temperature and/or humidity have dropped.
2. Humidity meter and or thermometer used are out of calibration.
3. Unit has entered defrost cycle.
4. Dirty air filter.
5. Defective defrost thermostat.
6. Low refrigerant charge.
7. Air leak such as loose cover or ducting leaks.
8. Defective compressor.
9. Restrictive ducting.
10. Optional Condensate Pump Safety Switch open.
Unit Test to determine the problem:| 1. Detach field control wiring connections from the main unit.
2. Connect the R and FAN contacts from the main unit together; only the
impeller fan should run. Disconnect the wires.
3. Connect the R and DHUM contacts from the main unit together; the
compressor and impeller fan should run.
4. If these tests work, the main unit is working properly. You should check
the control panel and field control wiring for problems next.
5. Remove the control panel from the mounting box and detach it from the
field-installed control wiring. Connect the blue, yellow, and green wires
from the control panel directly to the corresponding colored pigtails on
the main unit. Leave the violet, white, and red wires disconnected!
6. Turn on the humidity control. The compressor and impeller fan should
run.
7. If these tests work, the problem is most likely in the field control wiring.

Refrigerant Charging

If the refrigerant charge is lost due to service or a leak, a new charge must be accurately weighed in. If any of the old charges is left in the system, it must be recovered before weighing in the new charge. Refer to the unit nameplate for the correct charge weight and refrigerant type.

Compressor/Capacitor Replacement

This compressor is equipped with a two-terminal external overload and a run capacitor, but no start capacitor or relay.

Parts List

5-Year Limited Warranty

Resideo warrants this product to be free from defects in workmanship or materials, under normal use and service, for a period of five (5) years from the date of first purchase by the original purchaser. If at any time during the warranty period the product is determined to be defective due to workmanship or materials, Resideo shall repair or replace it  (at Resideo’s option).
If the product is defective,
(i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
(ii) call Resideo Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Resideo Return  Goods, 1985 Douglas Dr. N., Golden
Valley, MN 55422, or whether a replacement product can be sent to you.
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Resideo that the defect was caused by damage that occurred while the product was in the possession of a consumer.
Resideo’s sole responsibility shall be to repair or replace the product within the terms stated above.
RESIDEO SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES  RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDE MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES,  INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE FIVE YEAR
DURATION OF THIS

WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write esideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.

Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
https://customer.resideo.com
69-2407EFS—02 M.S. Rev. 07-21 | Printed in the United State

www.resideo.com

© 2021 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates.

Read User Manual Online (PDF format)

Download This Manual (PDF format)

Download this manual  >>