Honeywell Humidifier HM506H8908 - TrueSTEAM Humidifier 6 Gal Manual

The Honeywell HM506H8908 TrueSTEAM Humidifier is a 6-gallon whole-home steam humidifier designed for forced-air heating systems. It features automatic humidity control, a built-in humidistat, steam distribution technology, easy installation with included mounting brackets, low maintenance with self-cleaning cycles, 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 and Usage 8. Maintenance & Cleaning 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Steam Generator, Control Panel, Humidistat, Mounting Brackets, Water Inlet Valve, Drain Valve, Steam Hose, and Power Cord.

Feature	Description
Steam Generator	Produces clean, mineral-free steam for humidification
Control Panel	Digital display with humidity settings and status indicators
Built-in Humidistat	Automatically monitors and adjusts humidity levels
Mounting Brackets	For secure installation on wall or near HVAC system
Water Inlet Valve	Connects to home water supply for automatic refill
Drain Valve	For periodic flushing and maintenance
Steam Hose	Distributes steam to HVAC ductwork
Power Cord	120V AC connection for operation
Self-Cleaning Cycle	Reduces mineral buildup automatically
Low Water Detection	Alerts when water level is insufficient

Installation

Unpack and inspect all components. Ensure installation location is near HVAC system and water supply.

Mount unit: Use included brackets to mount on wall near HVAC return duct.
Connect water supply: Attach water inlet valve to cold water line using 1/4" tubing.
Connect drain line: Attach drain hose to drain valve and route to floor drain.
Connect steam hose: Attach to steam outlet and route into HVAC supply duct.
Electrical connection: Plug into dedicated 120V outlet (15 amp circuit recommended).
Connect control wires: Link to HVAC system for automatic operation with furnace fan.

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

First-Time Setup

After installation, power on the humidifier and configure initial settings.

Power on: Plug in unit; control panel will illuminate.
Set desired humidity: Use up/down buttons to set target humidity (30-60% recommended).
Configure fan control: Set to work with HVAC fan (continuous or intermittent).
Run initial cycle: Unit will fill with water and begin steam production.
Check for leaks: Inspect all connections during first operation cycle.

CAUTION! Do not set humidity above 60% to prevent condensation issues.

Specifications

Model: HM506H8908 TrueSTEAM Humidifier
Capacity: 6 gallons per day (maximum output)
Water Connection: 1/4" compression fitting for cold water supply
Power Requirements: 120V AC, 60Hz, 15 amps
Humidity Control: Digital humidistat with 5% to 90% RH range
Steam Output: Adjustable from 1 to 6 gallons per day
Dimensions: 15" H x 10" W x 8" D
Weight: 18 lbs (empty)
Operating Temperature: 40°F to 120°F
Warranty: 5-year limited warranty

Controls and Settings

Control Panel Features: Power Button, Humidity Up/Down, Mode Select, Reset Button, Status LEDs.

Display Indicators: Current Humidity, Set Humidity, Service Needed, Low Water, Power On.

Settings Menu: Humidity Set Point (30-60% recommended), Fan Control (Continuous/Intermittent), Self-Cleaning Interval (1-30 days), Output Level (1-6 gallons/day), System Test Mode.

Advanced Settings: Installer menu for calibration and diagnostic functions (accessed by holding buttons).

Connecting to HVAC System

Proper integration with HVAC system ensures optimal performance.

Turn off power to HVAC system before making connections.
Connect control wires: Use included 2-conductor wire to connect to furnace control board.
Steam distribution: Insert steam hose into supply duct (6-12 inches from furnace).
Water supply: Connect to cold water line with shut-off valve accessible.
Drain connection: Ensure proper slope for drain hose to prevent standing water.

Tip: Install a water filter in supply line to reduce mineral buildup.

Operation and Usage

Automatic operation based on humidistat settings and HVAC system status.

Normal operation: Unit operates when furnace fan runs and humidity is below set point.
Steam production: Water is heated to create steam, which is injected into ductwork.
Cycle completion: Unit drains and refills between cycles to minimize mineral concentration.
Self-cleaning: Automatic flush cycle based on usage or time interval.
Seasonal use: Adjust humidity set point lower in summer, higher in winter.
Vacation mode: Set to lower humidity or turn off when away for extended periods.

WARNING! Never operate without proper water supply or with blocked drain line.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

Monthly: Check and clean water filter if installed.
Quarterly: Inspect steam hose for mineral deposits; clean if necessary.
Annually: Perform manual cleaning of steam generator chamber.
Drain valve: Open periodically to flush out sediment.
Exterior: Wipe with damp cloth; do not use harsh chemicals.

CAUTION! Always disconnect power before performing any maintenance. Allow unit to cool before cleaning.

Regulatory Information

UL Listed: Meets UL 507 standard for electric humidifiers. FCC Part 15: Class B digital device compliant. CSA Certified: Meets Canadian safety standards. EPA Registration: Not required for this type of humidifier. For support, visit www.honeywellhome.com or contact 1-800-468-1502. Copyright © Honeywell International Inc.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No steam production	Power, water supply, or control issue	Check power connection; verify water supply is on; check control settings.
Low humidity reading	Sensor location or calibration	Ensure humidistat is not near moisture source; recalibrate if needed.
Water leakage	Loose connections or faulty valve	Tighten all connections; replace water inlet valve if leaking.
Mineral buildup	Hard water or infrequent cleaning	Install water softener; increase cleaning frequency; use descaling solution.
Unit not responding	Power issue or control board fault	Check circuit breaker; reset unit; contact service if problem persists.
Error code displayed	Various system faults	Refer to error code chart in manual; perform recommended reset procedure.

Reset Procedure: Hold Power and Down buttons for 10 seconds to reset control board.

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