Honeywell DR90A3000 - User Manual

Questions and Answers

L
Leah WallaceJul 27, 2025
What to do if my Honeywell Dehumidifier is removing less water than expected?
- B
  Brenda MorrisonJul 27, 2025
  If your Honeywell Dehumidifier isn't removing as much water as you expect, several factors could be at play. The air temperature or humidity might have dropped, or the humidity meter or thermometer you're using might be out of calibration. The unit may have entered a defrost cycle, or the air filter could be dirty. Other potential causes include a defective defrost thermostat, low refrigerant charge, air leaks, a defective compressor, restrictive ducting, or an open optional Condensate Pump Safety Switch.
D
Dale FloydJul 31, 2025
What to do if my Honeywell Dehumidifier is not dehumidifying?
- L
  lynn44Jul 31, 2025
  If your Honeywell Dehumidifier isn't dehumidifying, and neither the fan nor the compressor are running while the ventilation timer is off, first ensure the unit is plugged in and the outlet has power. The humidity control might be set too high or be defective. There could also be a loose connection in the internal or control wiring, a defective compressor relay, a defective control transformer, or an open optional Condensate Pump Safety Switch.
A
Andrea RoblesAug 4, 2025
Why is my Honeywell DR90A3000 evaporator coil frosted?
- M
  Mary GutierrezAug 4, 2025
  If the evaporator coil of your Honeywell Dehumidifier is continuously frosted and the dehumidifying capacity is low, the defrost thermostat may be loose or defective. Alternatively, there could be a low refrigerant charge, or the air filter(s) might be dirty, restricting airflow.
D
dramirezAug 9, 2025
Why does my Honeywell DR90A3000 Dehumidifier compressor cycle on and off too frequently?
- L
  lynchdeannaAug 9, 2025
  If the fan runs when dehumidification is needed and the ventilation control is off, but the compressor cycles on and off too frequently on your Honeywell Dehumidifier, it could be due to a low ambient temperature or humidity causing the unit to cycle through defrost mode. A defective compressor overload, a defective compressor, or a defective defrost thermostat could also be responsible. Additionally, check for dirty air filters or restricted airflow, a low refrigerant charge causing the defrost control to cycle, or a bad connection in the compressor circuit.
A
Austin JonesAug 13, 2025
Why is my Honeywell DR90A3000 fan running but the compressor is not?
- B
  Bailey ValdezAug 13, 2025
  If the fan of your Honeywell Dehumidifier runs when dehumidification is needed, but the compressor doesn't, and the ventilation control is off, the issue could stem from a defective compressor run capacitor, a bad connection in the compressor circuit, a defective compressor overload, or a defective compressor itself. Other possibilities include an open defrost thermostat or an open optional Condensate Pump Safety Switch.
M
Matthew TurnerAug 17, 2025
Why is my Honeywell DR90A3000 Dehumidifier not providing ventilation?
- R
  Robert FrenchAug 17, 2025
  If your Honeywell Dehumidifier isn't providing ventilation, check the control wire connections, including those at the fresh air damper. A defective fresh air damper could also be the cause. Additionally, ensure the air intake is clean and free from obstructions by cleaning the outside intake hood.
K
kellyclarkAug 21, 2025
What to do if the fan on my Honeywell Dehumidifier does not run with ventilation?
- D
  Danielle BakerAug 21, 2025
  If the fan on your Honeywell Dehumidifier doesn't run when ventilation is activated, but the compressor runs briefly and cycles on and off with the humidity control turned on, check for a loose connection in the fan circuit. Make sure no obstruction prevents the fan from rotating. The fan itself, the fan relay, or the fan capacitor could also be defective.

Summary

Product Components and Installation Essentials

Included in This Box

Lists the components that come with the dehumidifier unit.

Optional External Controls

Details compatible control systems sold separately.

Required Installation Tools

Lists the necessary tools for proper installation.

Installation Options

Outlines optional accessories for installation.

Safety Precautions

Installation Warning

Emphasizes that installation must be done by a qualified technician and power must be removed.

About Your Dehumidifier

Product Overview

Details the DR90/DR120A3000 dehumidifier's purpose and benefits.

Maintenance Schedule

Outlines the maintenance sections available in the manual.

Installation Guide

Refers to the installation sections in the manual.

Dehumidifier Benefits and Humidity Science

Key Product Benefits

Lists the advantages of using the DR90/DR120A3000.

Ideal Humidity Levels

Explains the importance of maintaining proper humidity for comfort and efficiency.

Humidity Impact on Perceived Temperature

Illustrates how humidity affects how hot the air feels.

Environmental Health Zones

Shows recommended humidity levels for various health and environmental factors.

External Control System Compatibility

Prestige IAQ Kit

Describes the features and capabilities of the Prestige IAQ Kit.

VisionPRO or Prestige Thermostat

Details the VisionPRO/Prestige thermostat's compatibility and features.

HumidiPRO Digital Control

Explains the functions of the HumidiPRO digital humidity control.

TruelAQ Digital Control

Outlines the features of the TruelAQ digital control.

Manual Dehumidistat and Automatic Ventilation Controls

Describes manual humidity control with automatic ventilation.

DR90 Model Specifications

Dehumidifier Capacity Requirements

Specifies required capacity based on home size and desired RH.

Physical Dimensions and Airflow

Details unit dimensions and airflow performance.

Electrical and Performance Ratings

Lists input/output ratings and energy performance.

Certifications and Standards

Covers ETL listing and ENERGY STAR rating.

DR120 Model Specifications

Dehumidifier Capacity Requirements

Specifies required capacity based on home size and desired RH.

Physical Dimensions and Airflow

Details unit dimensions and airflow performance.

Electrical and Performance Ratings

Lists input/output ratings and energy performance.

Certifications and Standards

Covers ETL listing and ENERGY STAR rating.

Installation Configuration Options

Duct Sizing Guidelines

Provides recommendations for duct diameter and length.

Dedicated Return to Main Supply Setup

Describes a specific ducting configuration for installation.

Main Return to Main Supply Setup

Describes an alternative ducting configuration.

Electrical Requirements

Details the necessary electrical connections and recommendations.

Advanced Installation Configurations and Plumbing

Main Return to Main Return Setup

Describes a ducting setup for running with A/C.

Dedicated Return to Dedicated Supply Setup

Outlines a setup for non-HVAC ducted systems.

Plumbing Requirements

Details how to connect the drain line and water trap.

Unit Terminals and Wiring

Terminal Block Description

Explains the function of each terminal on the unit.

Prestige Thermostat Wiring Diagram

Illustrates how to wire the unit with a Prestige thermostat.

Advanced Wiring Configurations

HumidiPRO Digital Humidity Controller Wiring

Shows wiring for the HumidiPRO controller.

Ducted Operation with External Humidity Control Wiring

Wiring for external humidity control in ducted systems.

Ducted Operation with External Humidity and Ventilation Control Wiring

Wiring for external humidity and ventilation control.

Smart Control Wiring Diagrams

TruelAQ Dehumidistat Wiring

Wiring diagram for the TruelAQ dehumidistat.

VisionPRO IAQ Wiring

Wiring diagram for the VisionPRO IAQ system.

Post-Installation Checks and Maintenance

Checkout Procedure

Steps to verify the unit is operating correctly after installation.

Annual Cleaning Procedure

Instructions for routine cleaning to maintain efficiency.

Technical Details and Troubleshooting

Refrigeration System Overview

Explains how the dehumidifier's refrigeration system works.

Troubleshooting Common Problems

Provides steps to resolve typical issues.

Advanced Troubleshooting Guidance

Fan and Compressor Operation Issues

Addresses problems with fan or compressor cycling.

Evaporator Coil and Unit Performance Issues

Covers issues like frosting or low capacity.

Unit Test Procedures

Outlines tests to diagnose unit problems.

DR90 Parts Identification

DR90 Base and Accessory Parts List

Lists components and their part numbers for the DR90.

DR120 Parts Identification

DR120 Base and Accessory Parts List

Lists components and their part numbers for the DR120.

Warranty Information

5-Year Limited Warranty Terms

Outlines the product's warranty coverage and limitations.

Honeywell DR90A3000 Specifications

General

Model	DR90A3000
Type	Dehumidifier
Capacity	90 pints per day
Energy Star Certified	Yes
Voltage	115 V
Operating Temperature Range	41°F to 95°F
Power Supply	115V, 60 Hz
Drainage	Gravity drain or manual drain
Humidity Control Range	35% to 80% RH
Water Removal System	Pump