Honeywell Humidifier HM509H8908 - TrueSTEAM 9 Gal Manual

The Honeywell HM509H8908 TrueSTEAM is a 9-gallon whole-house steam humidifier designed for residential forced-air heating systems. It features automatic humidity control, digital display, easy installation, low maintenance, and compatibility with most HVAC systems. 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 to HVAC System 7. Operation 8. Maintenance 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Steam generator, Control panel with digital display, Humidistat, Water valve, Drain valve, Installation kit.

Feature	Description
Steam Output	Up to 9 gallons per day
Control Panel	Digital display with touch controls
Automatic Humidity Control	Maintains set humidity level automatically
Installation Flexibility	Can be installed on supply or return duct
Water Treatment System	Reduces scale buildup
Drain Valve	For easy flushing and maintenance
Safety Features	Overheat protection, low water detection
Compatibility	Works with most forced-air heating systems
Power Requirements	120V AC, 60Hz
Warranty	Limited 5-year warranty

Installation

Unpack and inspect all components. Ensure proper tools and materials are available.

Choose installation location: Near HVAC system with access to water supply and drain.
Mount unit: Secure to wall or floor using provided brackets.
Connect water supply: Use 1/4" copper tubing to connect to cold water line.
Connect to HVAC: Install steam distribution tube into ductwork.
Electrical connection: Connect to dedicated 120V circuit.
Drain connection: Connect drain hose to suitable drain location.

WARNING! Installation should be performed by qualified HVAC technician. Ensure power is disconnected during installation.

First-Time Setup

After installation, complete initial setup and configuration.

Power on unit: Turn on circuit breaker.
Initial fill: Unit will automatically fill with water for first use.
Set humidity level: Use control panel to set desired humidity (30-60% recommended).
Calibrate humidistat: Follow on-screen prompts if needed.
Test operation: Verify steam production and proper drainage.

CAUTION! Do not operate without proper water connection. Ensure drain line is properly installed.

Specifications

Model: HM509H8908 TrueSTEAM
Capacity: 9 gallons per day
Voltage: 120V AC, 60Hz
Current: 15 Amps
Water Connection: 1/4" copper tubing
Drain Connection: 3/4" hose
Dimensions: 15" H x 12" W x 8" D
Weight: 25 lbs
Operating Temperature: 40-120°F
Humidity Range: 15-65% RH
Warranty: 5 years limited

Controls and Settings

Control Panel Features: Digital display, Humidity set buttons, Mode selection, Diagnostic display.

Basic Controls: POWER, Humidity UP/DOWN, MODE, DIAGNOSTIC, RESET.

Settings Menu: Humidity set point, Fan delay, Diagnostic mode, Factory reset. Advanced Settings: Scale control settings, Drain cycle frequency, Service reminders.

Connecting to HVAC System

Proper connection to HVAC system is critical for optimal performance.

Turn off HVAC system and disconnect power.
Locate installation point on ductwork (supply side recommended).
Cut 6" diameter hole for steam distribution tube.
Insert and secure distribution tube.
Connect steam hose from humidifier to distribution tube.
Ensure all connections are airtight.

Tip: Install at least 6 feet from cooling coil to prevent condensation issues.

Operation

Automatic operation maintains set humidity level.

Set desired humidity: Use UP/DOWN buttons (30-60% recommended for winter).
Unit monitors humidity: Automatically activates when humidity drops below set point.
Steam generation: Heats water to create steam, injects into ductwork.
Cycle completion: Shuts off when humidity reaches set point.
Drain cycle: Automatically flushes mineral deposits periodically.

WARNING! Do not set humidity too high in cold weather to prevent window condensation.

Maintenance

Regular maintenance ensures optimal performance and longevity.

Monthly: Check and clean water panel if equipped.
Quarterly: Perform manual drain cycle to flush minerals.
Annually: Descale heating chamber (more frequently in hard water areas).
Seasonal: Shut down and drain for summer if not used.
Filter replacement: Replace water filter every 6-12 months.

Care & Cleaning

Always disconnect power before cleaning.

Exterior: Wipe with damp cloth, mild detergent if needed.
Water reservoir: Drain completely, wipe clean.
Heating chamber: Use approved descaling solution annually.
Drain line: Flush with clean water to prevent clogging.

CAUTION! Never use harsh chemicals or abrasives. Do not submerge unit in water.

Regulatory Information

UL Listed. CSA Certified. FCC Part 15 Compliant. Manufactured to meet applicable safety standards. Copyright © Honeywell International Inc. For technical support, visit www.honeywellhome.com or contact 1-800-468-1502. Keep this manual for future reference.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No steam production	Power, water supply	Check circuit breaker; verify water valve is open; check for error codes.
Low humidity	Settings, scale buildup	Increase humidity setting; descale heating chamber; check duct connections.
Error code displayed	Various faults	Refer to error code chart in manual; reset unit if applicable.
Water leakage	Loose connections	Tighten all water connections; check drain hose for proper installation.
Unit cycling frequently	Scale buildup, oversized	Descale unit; verify proper sizing for home square footage.
Unusual noises	Mineral buildup	Perform drain cycle; descale heating chamber.

Reset Procedure: Press and hold RESET button for 5 seconds.

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