Honeywell DH90A1007 - Whole House Dehumidifier Dehumidifier manual

The Honeywell DH90A1007 is a whole-house dehumidifier designed for residential use, capable of removing up to 90 pints of moisture per day. It features automatic humidity control, a built-in condensate pump, digital controls with a display, washable air filter, continuous drain option, and compatibility with standard ductwork. Ideal for basements, crawl spaces, and large living areas to improve indoor air quality and comfort. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Drainage 7. Operating Modes 8. Maintenance 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Digital control panel, built-in condensate pump, washable air filter, duct collars (supply and return), humidity sensor, continuous drain port, and front grille for easy access.

Feature	Description
Digital Control Panel	LCD display for humidity setting, fan speed, and system status
Built-in Condensate Pump	Pumps water vertically up to 15 feet for flexible drainage
Washable Air Filter	Captures dust and particles; reusable after cleaning
Duct Collars	Standard 8-inch ducts for integration into HVAC system
Humidity Sensor	Automatically monitors and adjusts to set humidity level
Continuous Drain Port	For gravity drain option using 5/8" ID hose
Front Grille	Removable for easy filter access and maintenance
Auto Restart	Resumes previous settings after power outage
Fan Speed Control	Adjustable between low and high settings
Filter Alert Indicator	LED light reminds when filter needs cleaning

Installation

Unpack and inspect contents. Ensure installation location is level, with adequate clearance for airflow and service access.

Choose location: Install in a conditioned space (basement, utility room) near a drain and power outlet.
Duct connections: Attach supply and return ducts to collars using foil tape or clamps.
Electrical connection: Plug into dedicated 115V, 15A grounded outlet. Do not use extension cord.
Drainage setup: Connect hose to pump outlet or continuous drain port; route to drain or outside.

WARNING! Unit is heavy; use two people for lifting. Ensure all duct connections are airtight to prevent moisture loss.

First-Time Setup

Power on dehumidifier; follow initial setup steps on digital display.

Set desired humidity: Use UP/DOWN buttons to select 35% to 80% RH (recommended 45-50%).
Select fan speed: Choose LOW for quiet operation or HIGH for maximum moisture removal.
Test condensate pump: Pour water into drain pan to ensure pump activates and drains properly.
Check airflow: Ensure return and supply ducts are unobstructed.

CAUTION! Allow unit to sit upright for 24 hours if transported horizontally before powering on.

Specifications

Model: Honeywell DH90A1007
Moisture Removal: 90 pints per day (at 80°F, 60% RH)
Airflow: Up to 300 CFM
Duct Size: 8-inch round collars
Power Requirements: 115V, 60Hz, 7.5A
Operating Range: 55°F to 90°F
Humidity Control: 35% to 80% RH, ±5% accuracy
Pump Capacity: Lifts up to 15 feet vertically
Dimensions (HxWxD): 24.5" x 19.5" x 19.5"
Weight: 92 lbs
Refrigerant: R-410A

Controls and Settings

Access settings via digital control panel on front of unit.

Control Panel: POWER button, UP/DOWN buttons, FAN SPEED button, FILTER RESET button, LCD display.

Humidity Setting: Adjust between 35% and 80% RH. Fan Speed: Toggle between LOW and HIGH. Filter Alert: LED illuminates when filter needs cleaning; press FILTER RESET after cleaning. Pump Status: Display shows "Pump" when active. Continuous Operation: Hold DOWN button for 3 seconds to enable/disable continuous run mode.

Connecting Drainage

Two drainage options: condensate pump or continuous gravity drain.

Pump drainage: Connect 5/8" ID vinyl tubing to pump outlet; route to drain or outside.
Gravity drain: Connect hose to continuous drain port; ensure downward slope to drain.
Test drainage: Pour 2 cups of water into drain pan to verify proper flow.

Tip: Use insulated tubing in cold spaces to prevent condensation freeze-up.

Operating Modes

Supports automatic humidity control, continuous operation, and fan-only mode.

Automatic mode: Unit cycles on/off to maintain set humidity level (default).
Continuous mode: Runs constantly regardless of humidity; useful for rapid drying.
Fan-only mode: Circulates air without dehumidifying (accessed via special sequence).
Pump operation: Automatically activates when water reaches certain level in pan.
Defrost cycle: Automatically initiates if coil temperature drops below 40°F.

WARNING! Do not operate below 55°F ambient temperature without low-temperature kit (sold separately).

Maintenance

Regular maintenance ensures optimal performance and longevity.

Clean air filter every 3 months or when Filter Alert light illuminates.
Inspect drain lines quarterly for clogs or kinks.
Clean evaporator and condenser coils annually with soft brush.
Check duct connections yearly for air leaks.

Care & Cleaning

Unplug unit before cleaning. Use damp cloth for exterior; vacuum filter with soft brush attachment.

CAUTION! Do not use harsh chemicals, steam, or high-pressure water on coils or electrical components.

Regulatory Information

UL Listed. Meets EPA refrigerant standards. FCC Part 15 Class B compliant. Copyright © Honeywell International Inc. For support, visit www.honeywellhome.com or contact 1-800-468-1502. This product contains R-410A refrigerant; proper disposal required by certified technician.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Unit not powering on	Power source/breaker	Check outlet; reset circuit breaker; ensure plug is fully inserted.
Not removing moisture	Filter/ducts/temperature	Clean filter; check for blocked ducts; ensure room temp above 55°F.
Water not draining	Pump/clogged line	Check pump operation; clear drain line of obstructions; ensure proper slope.
Loud noise	Loose parts/fan	Tighten access panels; check for debris in fan wheel; ensure unit is level.
Display shows "Error"	Sensor/component fault	Power cycle unit; check sensor connections; call service if persistent.

Reset: Unplug for 60 seconds, then restart.

Service: 1-800-468-1502; www.honeywellhome.com