Honeywell Humidifier HM506DG115 - Furnace Humidifier, 2000 Sq Ft Manual

The Honeywell HM506DG115 is a bypass flow-through humidifier designed for installation on warm air furnace systems to add moisture to dry indoor air. It covers up to 2000 square feet, features automatic humidistat control, a water panel evaporator, and a drain system. This manual covers safety, installation, operation, maintenance, and troubleshooting for optimal performance.

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 Seasonal Use 8. Maintenance 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Humidifier cabinet, Automatic Humidistat, Water Panel Evaporator, Bypass Damper, Drain Hose, Installation Template.

Feature	Description
Coverage Area	Up to 2000 square feet
Humidistat	Automatic digital control with relative humidity display
Water Panel	Evaporator pad for efficient moisture transfer
Bypass Design	Uses furnace air flow; no separate fan required
Drain System	Includes drain hose and saddle valve for water supply
Installation	Mounts on furnace supply or return plenum
Power	24V AC from furnace transformer
Indicator Lights	Power, Call for Humidity, Service Required
Materials	Durable plastic cabinet, corrosion-resistant components
Warranty	Limited 5-year warranty

Installation

Unpack and inspect all parts. Ensure furnace is off before beginning.

Select Location: Mount on warm air supply plenum (recommended) or return air duct.
Cut Opening: Use template to mark and cut hole for humidifier.
Mount Cabinet: Secure cabinet to plenum with provided screws.
Connect Water: Install saddle valve on cold water line; connect tubing to humidifier.
Connect Drain: Attach drain hose to humidifier and route to floor drain.
Install Bypass Duct: Connect duct between supply and return plenums; install damper.
Wire Humidistat: Connect 24V wires to furnace transformer and humidifier solenoid.

WARNING! Turn off furnace power and water supply before installation. Follow local plumbing and electrical codes.

First-Time Setup

After installation, power on furnace and humidifier.

Set Humidistat: Adjust desired humidity level (typically 35-45% RH).
Test Operation: Run furnace; check water flow to panel and drain.
Check for Leaks: Inspect all water connections.
Calibrate (if needed): Compare humidistat reading with calibrated hygrometer.

CAUTION! Ensure bypass damper is open during heating season. Keep area around humidifier clear.

Specifications

Model: HM506DG115
Type: Bypass Flow-Through Furnace Humidifier
Coverage: Up to 2000 sq ft (average home)
Output: Up to 0.5 gallons per day (dependent on conditions)
Voltage: 24V AC (powered from furnace transformer)
Water Connection: 1/4" OD copper tubing with saddle valve
Drain: 5/8" ID hose
Dimensions (Cabinet): Approximately 14" H x 10" W x 6" D
Weight: 5 lbs (empty)
Operating Conditions: For use with forced air furnaces only

Controls and Settings

Digital Humidistat: Mount on return air duct or in living space.

Controls: Power Button, Up/Down Buttons (set desired RH%), Display (shows current and set humidity).

Settings: Desired Humidity (adjust 15-60% RH), Fan Delay (adjusts post-furnace run time), Calibration (adjust reading if needed). Operation Modes: Automatic (humidistat controls based on outdoor temperature), Manual (continuous operation). Indicator Lights: Green (Power), Yellow (Call for Humidity), Red (Service/Check Water Panel).

Connecting to HVAC System

Bypass Installation: Requires duct between supply and return plenums.

Ensure furnace is off at circuit breaker.
Install humidifier on warm air supply plenum.
Connect bypass duct to return air plenum.
Install damper in bypass duct to control air flow.
Wire humidistat to furnace control board and humidifier solenoid valve.

Tip: Position humidifier downstream from furnace heat exchanger for best performance.

Operation and Seasonal Use

Designed for use during heating season when indoor air is dry.

Heating Season: Set desired humidity (usually 35-45%). Humidifier runs when furnace runs and humidity is below set point.
Summer/Off-Season: Turn off humidistat. Close bypass damper. Shut off water supply at saddle valve.
Automatic Operation: Humidistat monitors indoor humidity and activates solenoid valve when needed.
Manual Override: Can run continuously for quick humidity boost (monitor for over-humidification).

WARNING! Do not operate without water panel installed. Excessive humidity can cause condensation on windows.

Maintenance

Regular maintenance ensures efficient operation and prevents mineral buildup.

Monthly: Check water panel for scale; replace if heavily mineralized.
Seasonal: Replace water panel at start of each heating season.
Annual: Clean humidifier cabinet; check drain hose for clogs; inspect saddle valve.
As Needed: Calibrate humidistat if reading seems inaccurate.

Note: Maintenance frequency depends on water hardness. Use genuine Honeywell replacement parts.

Care & Cleaning

Turn off power and water before cleaning.

Cabinet: Wipe with damp cloth; do not use harsh chemicals.
Drain Hose: Remove and flush with water if clogged.
Water Panel Tray: Remove mineral deposits with vinegar solution if needed.
Exterior: Dust humidistat display with soft cloth.

CAUTION! Never use abrasive cleaners. Ensure all parts are dry before reassembly.

Regulatory Information

UL Listed. CSA Certified. Complies with applicable US and Canadian safety standards. Manufactured for residential use. 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 humidity output	Water valve not opening	Check power to solenoid; ensure water supply is on; replace water panel.
Water leaking	Loose connections or clogged drain	Tighten all fittings; clear drain hose; ensure proper slope.
Humidistat not working	Power or wiring issue	Check 24V connection; reset circuit breaker; verify settings.
Mineral buildup	Hard water	Replace water panel more frequently; consider water softener.
Musty odor	Dirty water panel or standing water	Replace water panel; clean tray; ensure proper drainage.
Bypass air flow weak	Damper closed or duct restricted	Open bypass damper; check for obstructions in duct.

Reset: Turn humidistat off and on. Check furnace filter (dirty filter reduces air flow).

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