TrueSTEAM™

About your new humidifier

Congratulations on your new humidifier. Your Honeywell TrueSTEAM direct-injection humidifier provides the high performance and efficiency of steam humidification with easier maintenance than traditional humidifiers.

Benefits

• Actually controls your equipment for maintaining desirable humidity levels in your home year-round.
• Requires less water, reducing usage up to 70% when compared to flow-through humidifiers.

TrueSTEAM comes with one of the following control packages:

VisionPRO IAQ Total Comfort System YTH9421C1002

• Controls both temperature and TrueSTEAM.
• Sensor for displaying outdoor temperature.
• Intuitive user interface for easy 7-day temperature programming.
• Easy-to-read backlit digital display.
• Maintenance and service reminders.
• Controls other air quality equipment when you're ready.

TrueIAQ Digital Control DG115EZIAQ

• Automatic adjustments maintain ideal humidity.
• Sensor for displaying outdoor temperature and humidity.
• Shows actual humidity and desired setting.
• Maintenance and service reminders.
• Controls other air quality equipment when you're ready.

Manual Control H8908ASPST

• Manual control with intuitive comfort settings.
• Integrated humidity chart for accurate control in changing conditions.

Maintaining ideal humidity

Optimal Relative Humidity (RH) is defined by industry experts* as between 40-60% RH on an average annual basis, and 35% during the heating season in dry climates. An environment with too little humidity leaves the body vulnerable to viruses and bacteria, and can cause woodwork in the house to shrink and crack. On the other hand, too much humidity creates ideal conditions for mold and mildew growth.

Proper indoor humidity can also help you save money on energy bills. When maintained properly, your equipment won't have to run as much because humidified air feels warmer in the winter.

Humidity Impact Chart

A chart illustrating the impact of relative humidity on various factors, including bacteria, viruses, fungi, mites, respiratory infections, allergic rhinitis and asthma, chemical interactions, and ozone production. It highlights an "OPTIMUM ZONE" for humidity levels, typically recommended between 40-60% RH for optimal indoor conditions.

TrueSTEAM function and operation

Your TrueSTEAM humidifier provides the highest capacity and most efficient steam humidification for whole-house residential applications.

LED light feedback allows you to monitor performance, giving you total control and peace of mind.

True steam provides your home with high-capacity true humidity, while using up to 70% less water than flow-through humidifiers.

Key Features

• Snap-lock latch: Allows for quick, easy maintenance.
• Sediment screen: Keeps the tank clean for a longer period of time, reducing maintenance and ensuring optimum performance.
• Automatic operation: Automatically fills with water and drains when needed, so you don't have to remember to do it.
• Patented Condensate Collect Dome and beveled nozzle: Keep water in the tank, delivering only true steam into your duct's airflow.
• HVAC Integration: Wiring to your HVAC equipment allows TrueSTEAM to supply humidity when you need it by turning on your equipment automatically.

Setting the controls

The colder it is outside, the less humidity can be retained by the air. Initially setting your humidistat to ideal comfort levels will help your TrueSTEAM deliver optimal humidification. The table below provides suggested control settings based on outdoor conditions.

You may experience that your home needs humidity levels to be slightly higher or lower than the suggested levels given in the table, in order to prevent window condensation or dryness. This is because your home is unique in size, shape, building tightness, and age. These variables play an active role in how your indoor humidity fluctuates. Use the table as a starting point, but adjust according to your comfort and observations of condensation.

Suggested Humidity Settings by Outdoor Temperature

With automatic controls like TrueIAQ and VisionPRO IAQ, you need only calibrate this setting once. The automatic feature will adjust by itself as outdoor conditions change, based on your initial settings. After setting your auto control to the desired RH% level, check for condensation or frost forming on windows on the first cold day. If present, adjust your frost settings on the control (see control owner's manual if needed).

The Window Frost Protection feature protects your home by limiting humidity output based on outdoor conditions (for example, on colder days, your home can hold less humidity).

Humidity Adjustment Scale

A scale from 1 to 9, indicating "LESS HUMIDITY" (for loose homes/single-pane windows) to "MORE HUMIDITY" (for tight homes/triple-pane windows), used for adjusting frost protection settings.

Frost Settings should be lowered by one value each morning that you see frost or condensation on windows. Allow 24 hours for the adjustment to take affect. Once you have this set to a comfortable level without condensation forming, you will not need to adjust this again. You can adjust your humidity settings without worrying about condensation.

With Manual Humidity Controls—such as the H8908—you will need to adjust your RH% settings each time the outdoor conditions change (more humidity with warmer outdoor conditions, lower humidity with colder conditions). These controls provide accurate operation, but require more hands on adjustment. These controls are a good choice for homeowners who desire continuous interaction with humidity settings.

LED light indicators

The LED light panel on the TrueSTEAM lets you know that the humidifier is operating correctly, when maintenance is needed, and when it is safe to remove the tank for cleaning. The push buttons allow the tank to be drained for cleaning, and quickly return to operation when the tank is reattached to the humidifier.

• Power: Indicates the TrueSTEAM is plugged in and ready for operation.
• Humidifying: Indicates that steam is being delivered to the home.
• Clean Tank: Blinks when draining (via EMPTY button). Solid light indicates the tank is empty and safe to remove.
• Call Service: A fault indicator. Contact your HVAC technician.

Control Buttons

• Press Reset: Blinks during initial power-up or after cleaning, indicating a standby mode. Can be overridden by pressing the RESET button.
• Press Empty: Blinks to indicate the water tank needs cleaning. Press to drain the tank.
• Reset Button: Overrides the 5-minute delay, displays diagnostic codes for "Call Service" faults, clears faults, and resets "Clean Tank" timers.
• Empty Button: Press and hold for 3 seconds to drain the tank for service.

Diagram: Illustration of the TrueSTEAM unit's control panel showing the LED indicators and buttons.

Cleaning and maintenance

Maintenance is made simple with the TrueSTEAM—just remove the water tank for cleaning.

⚠️ Warning: Scalding hazard. Do not attempt to remove the humidifier from the mounting bracket during operation, or the humidifier's water tank when full of water. The heating element could be hot when tank is removed. Failure to comply could result in severe scalding or death.

❗ CAUTION: Hot water temperature above 140°F (60°C) can cause burns from scalding.

Drain Operation

• Auto flushing is configurable to 10, 20, or 30 hours of operational time.
• During auto flushing, cold water lowers the temperature below 140°F (60°C) before draining.
• During manual flush (pressing EMPTY button), initial water temperature may be above 140°F (60°C). Ensure drain outlet is not exposed and use caution. Do NOT remove the tank with water in it.
• Manual flush takes approximately 15 minutes to empty the tank completely.

To clean TrueSTEAM:

1. Press the EMPTY button. Wait for the CLEAN TANK light to be solid (not blinking).
2. Turn the manual shut-off valve at the bottom of the tank to the "Unlock" position.
3. Grip the white water valve arm and slide it back within the bracket to disengage from the tank.
4. Firmly grip the tank bottom. Push down the cover's safety button and pull the latch forward to release the tank. (Note: Latch does not come off humidifier with tank.)
5. Use tap water to flush loose minerals from the tank. The sediment screen at the tank's bottom is removable. For a more thorough cleaning, soak tank in warm, soapy water, then rinse clean. Tank is also dishwasher-safe.
6. Carefully rub minerals off the heating element and reservoir walls. Scouring pads suitable for non-stick pots or pans are suitable for cleaning.

Once clean, reattach the tank by securing the latch. Engage the water valve to the cam shaft and "Lock" the shut-off valve. The "Press Reset" light will blink at start-up. Push the RESET button to ready the humidifier.

Seasonal or vacation maintenance

The TrueSTEAM has built-in intelligence to shut down when humidity is not needed for an extended period. After 48 hours of inactivity, it drains its tank and remains empty until needed again, preventing water stagnation.

Maintenance Steps:

1. Follow steps 1-6 in the Cleaning section at least once per year, or when the Press Empty light blinks.
2. Clear ventilation holes in the humidifier's cover.
3. Clear the water drain tube.
4. Ensure the water tank gasket seal is not cracked or split before reattaching the tank.
5. Check that the humidifier is still level.

Extended Vacation

When leaving for extended vacations, it is recommended to turn off the humidifier's water supply and humidity control. Upon return, turn on the water supply and reset the humidity control to a comfortable position.

Homeowner troubleshooting

If you have difficulty with TrueSTEAM, try the following suggestions. Most problems can be corrected quickly and easily.

Troubleshooting Table

5-year limited warranty

Honeywell warrants this product to be free from defects in the workmanship or materials, under normal use and service, for a period of five (5) years from the date of purchase by the consumer. If at any time during the warranty period the product is determined to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell's option).

If the product is defective:

• Return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
• Call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you.

This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.

Honeywell's sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.

THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE FIVE-YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

This warranty gives you specific legal rights, and you may have other rights which vary from state to state.

For any questions concerning this warranty, please write Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502. In Canada, write Retail Products ON15-02H, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V4Z9.

Contact Information

Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
http://yourhome.honeywell.com

Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9

Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.

® U.S. Registered Trademark. © 2007 Honeywell International Inc. Patents pending.