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.
TrueSTEAMTM
Operating Manual
69-2035EFS-01

About your new humidifier
TrueSTEAM controls........................................................................................ 1
Maintaining ideal humidity .............................................................................. 2
TrueSTEAM function and operation ............................................................... 3
Setting the controls......................................................................................... 4
Specifications .................................................................................................. 5
Maintenance and operation
LED light indicators.................................................................................................6
Cleaning and maintenance .....................................................................................7
Seasonal or vacation maintenance ........................................................................8
DIP switch setting ...................................................................................................9
Troubleshooting and repair
Parts list.................................................................................................................10
Homeowner troubleshooting ................................................................................11
Professional HVAC technician troubleshooting...................................................12
Limited warranty....................................................................................................16
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For assistance with this product please visit http://yourhome.honeywell.com
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Table of contents
® U.S. Registered Trademark.
Patents pending.
Copyright © 2007 Honeywell International Inc. All rights reserved.

TrueSTEAM Direct-Injection Humidifier
1 69-2035EFS—01
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.

Operating Manual
69-2035EFS—01 2
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.
* American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE)
M24780
0 10 20 30 40 50 60 70 80 90 100
OPTIMUM
ZONE
Bacteria
Viruses
Fungi
Mites
Respiratory
Infections
Allergic Rhinitis
and Asthma
Chemical
Interactions
Ozone
Production
ASHRAE recommeded winter design level

TrueSTEAM Direct-Injection Humidifier
3 69-2035EFS—01
M24784
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.

Operating Manual
69-2035EFS—01 4
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.
M24830
123456789
LESS HUMIDITY
LOOSE HOME/SINGLE-PANE WINDOWS
MORE HUMIDIT
Y
TIGHT HOME/TRIPLE-PANE WINDOWS
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%

TrueSTEAM Direct-Injection Humidifier
5 69-2035EFS—01
Install TrueSTEAM according to National Electric Codes.
Capacity:
HM512: 12 gallons per day (gpd) (45 liters per day [lpd])
HM509: 9 gpd (34 lpd)
HM506: 6 gpd (23 lpd)
Humidified Area:
House Description Air Changes Per Hour HM512 HM509 HM506
Loose Two 2000 sq. ft. 1300 sq. ft. 1000 sq. ft.
Average One 2500 sq. ft. 1800 sq. ft. 1500 sq. ft.
Tight One-half 3000+ sq. ft. 2500 sq. ft. 2000 sq. ft.
Weight:
Model Empty Filled with Water
HM512 9 lbs. 15 lbs.
HM509 9 lbs. 14.5 lbs.
HM506 8 lbs. 12 lbs.
Dimensions: 11-1/4 in. W x 19 in. H x 9 in. D
Humidifier Operating Temperature Range: 34ºF–104ºF (1.1ºC–40ºC)
Remote Hose/Nozzle Operating Temperature Range: -50ºF–250ºF (-46ºC–121ºC). Meet this spec-
ification if purchasing hose off-the-shelf.
Operating Humidity Range: 0–95% RH, non-condensing
Drain Hose Operating Temperature Range: 34ºF–212ºF (1.1ºC–100ºC)
Electrical Ratings and Tolerances
Specifications
Input Ratings
• Power Supply: 120VAC +10/ -15%, 60Hz
- HM512: 1440W at 120VAC at full load
- HM509: 1200W at 120VAC at full load
- HM506: 840W at 120VAC at full load
• HM512: 12A, 120VAC
• HM509: 10A, 120VAC
• HM506: 7A, 120VAC
• 15A, 120VAC interlock switch
• Thermostat/HVAC power monitor (R to
C): 10mA resistive at 24VAC
• Field wiring terminals: 18–22 ga. solid
• HVAC power/airflow monitor: 10 mA
resistive at 24 VAC
Output Ratings
• Relay output contacts:
- Fan: 1.5A full load, 7.5A locked rotor
at 24VAC
- Heat and Backup: 15A resistive at
120VAC
• Fill Solenoid: 0.1A at 120VAC, 0.5 PF
• Drain Solenoid: 0.1A at 120VAC, 0.5PF
• Humidistat output contacts: 10mA
resistive at 24VAC
• Humidistat power supply: 100mA at
24VAC
Standards & Approval Body Requirements
Underwriters Laboratories: UL998, File no. E185662.
Federal Communications Commission: Class B compliance, File no. YU555.
Tested to ARI standard 610 and ASHRAE 62.2 for performance rating of central system humidi-
fier for residential applications. Intended to be used in accordance with the National Electrical
Code (NEC), ANSI/NFPA 70, and the rules of the Canadian Electrical Code (CEC), Part 1, C22.1.

Operating Manual
69-2035EFS—01 6
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 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 will drain the tank of water when pushed. Do this before
servicing the tank and internal parts.
POWER
HUMIDIFYING
CLEAN TANK
CALL SERVICE
PRESS RESET
PRESS EMPTY
RESET
EMPTY
SEE LABEL BELOW !
M24763

TrueSTEAM Direct-Injection Humidifier
7 69-2035EFS—01
About your new thermostatCleaning 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).
2. Turn the manual shut-
off valve at the bottom
of the tank to the
“Unlock” position.
Maintenance is made simple with the TrueSTEAM—just remove the water tank for cleaning.
EMPTY
M24774
CLEAN TANK
(BLINKING LIGHT)
M24775
M24777
M24778
M24779
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.
M24776
CLEAN TANK
(ON SOLID)
Wait Go to Step 2

Operating Manual
69-2035EFS—01 8
About your new thermostat
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.
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.
Cleaning and maintenance
M24856
M24857
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.
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.