Honeywell TrueSTEAM User manual

Must be installed by a trained, experienced technician
Read these instructions carefully. Failure to follow these instructions
can damage the product or cause a hazardous condition.
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About your new humidifier
TrueSTEAM controls ...............................................................................................1
Maintaining ideal humidity......................................................................................2
TrueSTEAM function and operation .......................................................................3
Setting the controls.................................................................................................4
Maintenance and operation
LED light indicators.................................................................................................5
Cleaning and maintenance .....................................................................................6
Seasonal or vacation maintenance ........................................................................8
Troubleshooting and repair
Homeowner troubleshooting ..................................................................................9
Limited warranty....................................................................................................10
Read and save these instructions.
Need Help?
For assistance with this product please visit http://yourhome.honeywell.com
or call Honeywell Customer Care toll-free at 1-800-468-1502
Table of contents
® U.S. Registered Trademark.
Patents pending.
Copyright © 2007 Honeywell International Inc. All rights reserved.

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About your new thermostat
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:
About your new humidifier
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.

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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 proper-
ly, your equipment won’t have to run as much because humidified air feels warmer in the winter.
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TrueSTEAM function and operation
Your TrueSTEAM humidifier provides the highest capacity and most efficient steam humidifica-
tion for whole-house residential applications.
The patented Condensate
Collect Dome and beveled nozzle
keep water in the tank, delivering
only true steam into your duct’s
airflow.
Sediment screen
keeps the tank clean
for a longer period of
time, reducing main-
tenance and ensuring
optimum perfor-
mance.
Wiring to your HVAC equipment
allows TrueSTEAM to supply humidity
when you need it by turning on your
equipment automatically.
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.
Snap-lock latch allows
for quick, easy main-
tenance.
Automatically fills with
water and drains when
needed, so you don’t have
to remember to do it.

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With automatic controls like TrueIAQ and VisionPRO
IAQ, you need only calibrate this setting once. The
automatic feature will adjust by itself as outdoor condi-
tions change, based on your initial settings. After set-
ting 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).
Frost Settings should be lowered by one value each morning that you see frost or condensa-
tion 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 con-
ditions, lower humidity with colder conditions). These con-
trols provide accurate operation, but require more hands on
adjustment. These controls are a good choice for homeown-
ers who desire continuous interaction with humidity settings.
Setting the controls
The colder it is outside, the less humidity can be retained by the air. Initially setting your humidi-
stat to ideal comfort levels will help your TrueSTEAM deliver optimal humidification. The table
below provides suggested control settings based on outdoor conditions.
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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 dry-
ness. 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 start-
ing point, but adjust according to your comfort
and observations of condensation.
Outdoor
Temperature
Recommended RH %
Setting
-20°F (-29°C) 15%
-10°F (-23°C) 20%
0°F (-18°C) 25%
10°F (-12°C) 30%
20°F (-7°C) 35%
>20°F (-1°C) 40%

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About your new thermostatLED 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 but-
tons 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 that the humidifier is
ready for operation.
Humidifying indicates that steam is being delivered to the home.
Clean Tank: This LED blinks to indicate the TrueSTEAM is draining when
you press the EMPTY button. When the light is on solid (not blinking), the
tank is empty and safe to remove for cleaning.
Call Service is a fault indicator. Call your HVAC technician to service the
humidifier. HVAC technicians: Refer to page 12 for fault identification and
troubleshooting.
Press Reset will blink when power is applied or reapplied (upon initial
installation or after cleaning). This is a stand-by mode to ensure water
lines are hooked up properly before unit resumes operation. This will blink
for 5 minutes before going to system ready. The 5-minute default can be
overriden by the installer by pressing the RESET button.
Press Empty will blink to indicate that the water tank needs cleaning. Push
the EMPTY button to drain the tank for safe removal and cleaning.
Reset Button If the Press Reset light is blinking, press the RESET button to
override the 5-minute delay at startup. If the Call Service LED is on (fault is
present), press/release the RESET button to blink a diagnostic code on the
Call Service LED. Press/Hold the button for 5 seconds to clear all faults and
reset “Clean Tank”timers. If the Press Empty LED is blinking, press/hold the
RESET button for 5 seconds to turn off the Press Empty LED and restart the
Clean tank timer.
Empty Button Press and hold for 3 seconds to drain the tank of water for
service. Do this before servicing the tank and internal parts.
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Cleaning and maintenance
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.
To clean TrueSTEAM:
1. Press the EMPTY button. Wait for the CLEAN TANK light to be on solid (not blinking).
Maintenance is made simple with the TrueSTEAM—just remove the water tank for cleaning.
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Wait
(approximately 15 minutes)
Go to Step 2
Drain Operation
•Auto flushing is configurable to 10, 20 or 30 hours of operational time (heating element
active).
•During auto flushing, cold water will enter the tank to lower water temperature below 140°F
(60°C) before draining.
•During manual flush (performed by pressing the EMPTY button) initial water temperature
may be above 140°F (60°C). Ensure drain outlet is not exposed and use caution when
pressing the EMPTY button, and do NOT attempt to remove the tank with water in it.
•Manual flush takes approximately 15 minutes to empty the tank completely.
CAUTION
Hot water temperature above 140°F (60°C) can cause burns from scalding.

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2. Turn the manual shut-
off valve at the bottom
of the tank to the
“Unlock”position.
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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.
3. Grip the white water
valve arm and slide it
back within the bracket
to disengage from the
tank.
Cleaning and maintenance
5. Use tap water to flush loose minerals
from the tank. Sediment screen at
tank's bottom is removable. For a more
thorough cleaning, soak tank in warm,
soapy water, then rinse clean. Tank is
also dishwasher-safe.
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6. Carefully rub minerals off of the heating
element and reservoir walls. Scouring
pads suitable for non-stick pots or pans
are suitable for cleaning the TrueSTEAM
reservoir walls and components within the
tank.
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Sediment screen
Once clean, reattach 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.

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Seasonal or vacation maintenance
TrueSTEAM has the built-in intelligence to shut down when humidity is not needed for an
extended period. After 48 hours of inactivity, TrueSTEAM will drain its tank and remain empty
until it is needed again. This prevents water from stagnating within the tank. There are a few
house-cleaning steps to follow to keep your TrueSTEAM at peak efficiency:
1. Follow steps 1–6 in the Cleaning section on pages 7–8 at least once per year, or when the
Press Empty light is blinking.
2. Clear ventilation holes in the humidifier’s cover.
3. Clear the water drain tube.
4. Make sure the water tank gasket seal is not cracked or split before reattaching the
humidifier water tank.
5. Check that the humidifier is still level.
Extended Vacation
When you leave on extended vacations, it is recommended you turn off the humidifier’s water
supply and turn off the humidity control. When you return, turn on the humidifier water supply and
reset your humidity control to a comfortable position.

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Homeowner troubleshooting
If you have difficulty with TrueSTEAM, please try the following suggestions.
Most problems can be corrected quickly and easily.
Problem Look For What to Do
Low humidity Humidifier heater is
not operating
•Confirm that power light is on.
•Set the humidistat higher.
•Check that the furnace power is on.
•Reset your circuit breaker or check for blown fuse.
•If fault persists, turn humidistat off, unplug unit,
reset circuit breaker and call a professional HVAC
contractor.
Rapid air changes.
Drafts (cold air
is dry and is an
added load for the
humidifier)
•Keep doors and windows closed.
•Close fireplace damper when not in use.
•Keep exhaust fan running time to a minimum.
•Seal around doors and windows.
High Humidity Condensation on
walls
•Turn off the humidity control until condensation is
completely evaporated. Lower humidistat setting to
prevent reoccurance of condensation (see pages 2–4
for controlling humidity levels).
Heavy
condensation on
windows
•Turn humidity control down low enough to eliminate
condensation caused by moisture from bathing,
mopping, cooking, etc. If moisture persists, more
ventilation is needed.
Call for
Service LED
is blinking
TrueSTEAM has
detected one of 15
system faults.
•Press Reset button.
•If fault persists, turn off power supply to the
humidifier, and turn back on.
•If fault persists, call a professional HVAC contractor.

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
® U.S. Registered Trademark.
© 2007 Honeywell International Inc.
Patents pending.
69-2035EFS—03 M.S. Rev. 11-07
Automation and Control Solutions
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
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 deter-
mined to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option).
If the product is defective,
(i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
(ii) 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.
If you have 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.