Owner’s Guide
TrueIAQ®
Digital IAQ Control
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About TrueIAQ®
The TrueIAQ® monitors and automatically adjusts operation of your whole-house humid-
ifier, dehumidifier, ventilator, or bath fan.
Maintaining proper indoor humidity minimizes the potential for unhealthy airborne pol-
lutants to grow. Having too little humidity can leave you vulnerable to infections and
uncomfortable dry skin. Too much humidity creates ideal breeding grounds for mold,
mildew and dust mites. Humidified air also feels warmer in the winter, and dry air feels
cooler in the summer.
TrueIAQ can adjust humidity with or without dependency on HVAC equipment opera-
tion. If you have both a humidifier and dehumidifier installed, the TrueIAQ can automati-
cally change over to the appropriate equipment based on your comfort settings and the
changing outdoor conditions.
TrueIAQ can also deliver fresh air with or without dependency on HVAC equipment
operation. Today’s building codes require homes to be built more tightly for energy effi-
ciency, but that tightness can also trap indoor air pollutants, such as cooking odors,
cleaning agents, radon, and carbon dioxide/monoxide. TrueIAQ provides cost-effective
ventilation in accordance to industry standards. In addition, the TrueIAQ can be pro-
grammed to deliver ventilation during set times of the day or night.
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Operation
TrueIAQ® can be used to control the humidity levels in your home, and control fresh air
intake in accordance to industry recommendations (ASHRAE 62.2).
Comfort Settings: Feedback
on your indoor IAQ conditions.
Indoor Conditions: Actual
indoor temperature and
humidity.
Outdoor Conditions1: Actual
outdoor temperature and
humidity.
In
%
Programmable Clock:
Displays time and allows
IAQ equipment programming
based on time.
6840
7655
Out
%
PM
:
12 15
Maintenance Reminders:
Notifies you when your equip-
ment needs service.
Equipment Operation:
Displays what equipment is
operating at a given time.
Done: Saves changes.
More: Advances between
installed IAQ equipment control
options.
Toggle Arrows: Changes the
comfort levels of your IAQ
equipment operation.
M24931
1
Actual outdoor temperature and humidity will only be displayed if the outdoor sensor is installed.
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Display screen reference
Wet: Indoor
humidity levels are
above 60% RH.
Window Frost: The control is
protecting your home against too
much humidity based on outdoor
conditions. Humidity levels in your
home may not reach your desired
RH% setting as a result.
Dry: Indoor humidity levels
are below 20% relative
humidity (RH.)
In
%
Indoor temperature
and humidity.
6840
7655
:
12 15
Out
%
Outdoor temperature
and humidity.
De Humidify: If “Humidify” is dis-
played, the control is calling for
more humidity. If “DeHumidify” is
displayed, the control is calling for
humidity removal.
PM
Ventilate: Fresh air ventilation
is on.
M24932
Service Reminders: All are timer-based
and will be displayed to indicate what
service is needed.
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Changing humidifier settings
Note: These items will appear only if a humidifier is installed on your system.
1. Set humidifier by pressing UP/DOWN arrows.
35 %
Tables below are recommended initial humidity settings based on
outdoor temperature. If window frost setting (see next page) is not
being used, the humidity setting should be adjusted manually when
outdoor conditions change.
Humidify
Set
M24831
Red font is
blinking on
screen.
Outdoor Temp.
-20°F (-29°C)
0°F (-18°C)
Setting
15%
25%
20°F (-7°C)
35%
If both humidifier (hum) and dehumidifier (dehum) are installed:
Dehum setpoint can only be equal to or higher than Hum setpoint. If equal, equipment
changeover will be at least 5% higher (dehum) or lower (hum).
If not equal, changeover occurs at setpoint plus 2% RH (control’s deadband).
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Changing humidifier settings
2. Press “More” to enter Window Frost Protection. Use the UP/DOWN
arrows to set frost protection level.
Window Frost
LESS HUMIDITY
MORE HUMIDITY
7
Humidify
LOOSE HOME/SINGLE-PANE WINDOWS
TIGHT HOME/TRIPLE-PANE WINDOWS
1
2
3
4
5
6
7
8
9
M24830
On the first cold day after TrueIAQ® is installed, look for condensation
on windows. If present, lower Frost Protection by one. Once set for your
home, Frost Protection does not need to be changed again.
M24832
3. Press “More” again to enter operation style. Press the UP/DOWN
arrows to set.
Auto
Off
Humidify
•
•
“Auto” runs humidifier automatically according to settings.
“Off” turns the humidifier off.
M24833
4. Press “Done” to save settings, or “More” to enter dehumidifier
settings.
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Changing dehumidifier and ventilation settings
Note: These items will appear only if a dehumidifier is installed. If both a humidifier
and dehumidifier are installed, these settings will appear after pushing “More” from the
humidifier operation style screen.
60%
1. Set dehumidifier by pressing the UP/DOWN arrows. RH% will change
in increments of five.
DeHumidify
2. Press “More” to enter operation style. Press the UP/DOWN arrows to
set.
Set
M24834
•
“Auto” runs dehumidifier automatically according to your RH%
settings.
Auto
Off
DeHumidify
•
“Off” turns the dehumidifier off.
3. Press “Done” to save settings, or “More” to enter ventilation settings.
M24835
Note: These items will appear only if a ventilator is installed.
Time On
Ventilate
1. Use the UP/DOWN arrows to run ventilation temporarily. Range is
from 20 to 480 minutes, in 20-minute increments.
0020
2. Press “More” again to enter operation style.
M24836
•
•
•
“Auto” runs ventilation according to installer settings.
“ON” runs ventilation continuously.
Auto
On Off
“OFF” turns ventilation off. In this mode, ventilation will only
Ventilate
run if turned on by a remote switch.
3. Press “Done” to save settings, or “More” to enter time settings.
M24837
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Changing time of day and service timers
:
12 00
Set
1. Press “More.” Adjust hour using the the UP/DOWN
arrows.
2. Press “More.” Adjust minutes using the UP/DOWN
arrows.
3. Press “Done” to save settings.
M24934
:
12 00
Set
Service Timers
Service timers appear when the humidifier, dehumidifier,
ventilator, air filter, and/or UV bulbs need service. Your HVAC
technician will set these timers during installation.
M24935
Resetting Service Timers
Press and hold the DOWN arrow for 5 seconds to reset your
service timers.
M24933
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Installation
CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or
equipment damage. Disconnect power before beginning installation.
1. Turn system power off.
2. Choose a location. TrueIAQ® can be mounted to a wall or directly to the return duct.
ELE
CTR
ON
IC
A
IR
C
LEA
NER
M24787
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Installation
3. Loosen the cover screw.
4. Separate the front housing from the base.
M24814
5. For wall mounting, run wires through
the back hole to the terminals. Wire
size for all connectors:
2 x 18 AWG to 1 X 22 AWG.
Install the mounting plate using two
screws.
M24818
A
6. For duct mounting, (A) snap out side wall clip and attach
as shown. Run wires through the side wall hole, under
the clip, to the terminals. (B) Snap in sensor cap.
7. Reinstall the front housing on the power base, and
secure with screw.
Note: If duct mounted, ensure sensor cap tip aligns with
air flow in duct.
8. Apply power to the system.
M24854
B
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Wiring
Pin
Pin description
Pin capacity
R
24V supply. Must be common to G output. 24Vac±20% 1.5
amp max
C
24V supply common.
24Vac±20%
Sensor Communication and supply bus to remote 24Vdc 64mA max
sensors (sensor pins not polarized).
out
Sensor
Switch Override switch input. Active when R is
applied
24Vac±20%,
10mA max in
24Vac±20%,
W
W input to sense when the thermostat is
calling for heat. Active when R is applied. 10mA max in
G input to sense fan calls. Active when R is 24Vac±20%,
applied. Fan output to activate system fan. 10mA max in
G
R8222 Isolation Relay may be required if G
is not isolated through the thermostat.
24Vac from R,
1Amp max out
24Vac from R,
1Amp max out
Vent 1
Vent 2
Dry contact output. Opens the vent
damper of an HRV or the bathroom fan
and Damper.
Dehum 1 Dry contact output. Starts the
24Vac from R,
1Amp max out
24Vac from R,
1Amp max out
Dehumidifier or an alternate fan speed.
Dehum 2
Hum 1
Hum 2
Dry contact output. Starts the Humidifier.
M24819
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Wiring
Wiring TrueIAQ® with a non-powered humidifier.
+
–
R
24V
TRANSFORMER
C
THERMOSTAT
R
C
W
Y
SENSOR
SENSOR
SWITCH
W
TrueIAQ
In
%
68 40
Out
%
7655
PM
:
1215
G
G
HVAC
HE225
BYPASS
HUMIDIFIER
VENT
VENT
DEHUM
DEHUM
HUM
HUM
M27340
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Wiring
Wiring TrueIAQ® with a
powered humidifier.
HVAC
W
TrueIAQ
In
%
68 40
Out
%
HUM
HUM
24V
7655
R
C
Y
G
PM
:
1215
24V
24V
24V
HUM
HUM
C
RECOMMENDED
PRESSURE
SWITCH
GT
R
RT
GF
EXT
R
Rc
W
Y
G
FACTORY
INSTALLED
JUMPER
TrueSTEAM - INTERNAL
THERMOSTAT
NOTE: IF PRESSURE SWITCH IS USED, ENSURE DIP 5 IS IN ON POSITION. M27341
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Wiring
Wiring TrueIAQ® with a dehu-
midifier and ventilation damper.
TH8110U
Rc C
1
R
W
Y
G
TrueIAQ
R
C
W
Y
R
C
In
%
68 40
Out
%
OUTDOOR
SENSOR
(PROVIDED)
SENSOR
SENSOR
SWITCH
W
7655
HVAC
PM
:
1215
G
G
VENT
VENT
DEHUM
DEHUM
HUM
EARD-6
DH90 DEHUMIDIFIER
GRAY DAMPER CONTROL
HUM
(NOT USED)
RED +24VAC POWER
YELLOW
COMPRESSOR
CONTROL COMM.
BLUE FAN AND
COMPRESSOR CONTROL
GREEN FAN ONLY
CONTROL
1
IF A THERMOSTAT OTHER THAN A TH5110, TH5220, TH5320, TH6110,
TH6220, TH6320, TH8110, TH8320 OR TH8321 IS USED, A RELAY MAY BE
REQUIRED TO ISOLATE THE G WIRE.
M27390
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Wiring
Wiring TrueIAQ® with a
humidifier and HRV/ERV
ventilator.
TH8110U
Rc C W
R
Y
G
1
TrueIAQ
R
C
W
Y
R
C
In
%
6840
Out
%
OUTDOOR
SENSOR
SENSOR
SENSOR
SWITCH
W
7655
HVAC
PM
:
1215
(PROVIDED)
G
ERV/HRV
G
RED
VENT
VENT
DEHUM
DEHUM
HUM
BLACK
GREEN
HE265
2
HUM
C
R
24 VOLT/40VA
TRANSFORMER
L2
L1
1
2
IF A THERMOSTAT OTHER THAN A TH5110, TH5220, TH5320, TH6110, TH6220,
TH6320, TH8110, TH8320 OR TH8321 IS USED, A RELAY MAY BE REQUIRED TO
ISOLATE THE G WIRE.
FOR WIRING OF HUMIDIFIER OTHER THAN THE HE265 READ THE INSTALLATION
M27391
INSTRUCTIONS.
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Wiring
Wiring TrueIAQ® with a non-
powered humidifier, ventila-
tion damper, and an auxiliary
exhaust fan.
TH8110U
1
R
Rc C
W
Y
G
TrueIAQ
R
C
W
Y
R
C
In
%
68 40
Out
%
OUTDOOR
SENSOR
(PROVIDED)
SENSOR
SENSOR
SWITCH
W
7655
HVAC
PM
:
1215
G
G
VENT
VENT
DEHUM
DEHUM
HUM
EARD-6
HE265
2
HUM
EXHAUST FAN
BLACK
WHITE
L1
W
Y
R
C
120 VOLT POWER
L2
G
YELLOW
BLACK
3
R8239 FAN CENTER RELAY
1
IF A THERMOSTAT OTHER THAN A TH5110, TH5220, TH5320, TH6110, TH6220, TH6320, TH8110, TH8320
OR TH8321 IS USED, A RELAY MAY BE REQUIRED TO ISOLATE THE G WIRE.
2
FOR WIRING OF HUMIDIFIER OTHER THAN THE HE265 READ THE INSTALLATION INSTRUCTIONS.
IF A RELAY OTHER THAN THE R8239 IS USED, A DEDICATED TRANSFORMER WITH AT LEAST 40 VA IS
REQURED TO POWER THE HE265 AND EARD. IF AN R8239 IS USED (AS SHOWN IN THIS DIAGRAM) NO
3
ADDITIONAL TRANSFORMER IS REQURED.
M27392
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Mounting the outdoor sensor
1. Do not mount on the south side of the house or in direct exposure to sunlight.
2. Keep at least 4 feet away from exhaust
vents.
3. If in an air intake, place 1 foot closer to
outside wall.
4. Place at least 6 inches higher than
possible snow buildup.
5. Do not route sensor wire near high
voltage wires.
Note: The sensor can be extended using
18-gauge wire.
M24821
M24822
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Advanced HVAC installer setup instructions
1. Press and hold the UP/
DOWN arrows for 3 seconds.
2. Press “More” to advance to the
next setup option. See table on
next page.
M24823
M24824
3. Use the UP/DOWN arrows to
select options. See table on next
page.
4. Press “Done” at any time to save and
return to the home screen.
M24825
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Advanced programming
To be used by qualified HVAC technician.
Setup functions
Settings & Options (factory default in bold)
1=Fahrenheit; 2=Celcius
0=Not installed
10
Temperature Display
Frost Protection
15
1=Frost Protection OFF
2=Frost Protection ON
5%-80% in 5% increments; 40%
20
25
Humidity High Limit
Humidifier Operation
0=Hum only while heat on
1=Hum only while fan on 3=Hum operates indepen-
dent of fan
2=Hum forces fan on
30
35
Programmed Humidity
Program Start Time
(appears only if ISU30=1) 11:00 PM
0=OFF; 1=ON
15 min increments
40
45
Program End Time
(appears only if ISU30=1) 7:00 AM
DEHUM Terminal
Equipment Type
15 min increments
0=No Dehum (low speed vent)
1=Dehum only
50
55
60
High Dehum Limit
Low Dehum Limit
Dehumidifier Operation
35%-80%, in 5% increments
35%-80% in 5% increments
0=Dehum forces fan on
1=Dehum operates independent of fan
Set between -5% to 5% to recalibrate humidity sensing
0=OFF (no offset)
65
80
Humidity Display Offset
Hum Service Timer
0,1,3,6,12 (months continuous)
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Advanced programming
Setup functions
Settings & Options (factory default in bold)
0,1,3,6,12 (months intermittent)
Hum Water Filter Service 0,1,3,6,12 (months intermittent)
85
90
95
100
105
Hum Service Timer
Air Filter Service Timer
Vent Filter Service Timer
Vent Service Type
0,1,3,6,12 (months continuous)
0,1,3,6,12 (months continuous)
0=Clean ventilation filter
1=Change ventilation filter
110
115
UV Bulb Service Reminder 0,6,12,24 (months continuous)
Vent Options
0=No vent installed
1=Ventilation using VENT contacts
2=Ventilation using VENT contacts for high speed and
DEHUM contacts for low speed (only if dehum not
installed)
3=Ventilation using VENT contacts and DEHUM contacts
activated together (auxiliary ventilation device such as
exhaust fan)
120
Vent Operation
0=Vent forces HVAC fan on
1=Vent operates independent of HVAC fan
0=OFF; 1=ON
125
130
Programmed Vent
Program Start Time
15 min increments
135
(appears only if ISU125=1) 9:00 AM
ASHRAE: # of Bedrooms 1-6 bedrooms; 2
140
145
ASHRAE: Home’s Sq Ft
10=1,000 Sq Ft; up to 50=5,000 Sq Ft
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Advanced programming
Setup functions
Settings & Options (factory default in bold)
150
ASHRAE: CFM Setting
3=30 CFM; 4=40 CFM, up to 20=200 CFM
00; 30%–95%. (00 setting runs to ASHRAE 100%)
0=Auto vent regardless of outdoor conditions
1=Off at 75°F dew point or 99°F air temp
155
160
Maximum Vent
Vent Shut-offs
2=Low speed at 65°F dew point or 85°F air temp. Off at
75°F dew point or 99°F air temp
Note: If option 1 or 2 is selected, then ASHRAE 62.2
Standard will not be met.
165
Dehumidification Via
Fresh Air Ventilator
0=Do not use ventilation for dehum
1=Allow vent for dehum per outdoor conditions.
With dehum installed, control to setpoint. Without
dehum installed, control to the Hum setpoint +10%
(max 60%).
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Environmental standards/life expectancy
TrueIAQ® Control and Outdoor Sensor
Power Supply
•
Operating/Storage temp: -40°F to
120°F (-40°C to 50°C)
•
24Vac ± 20% 50, 60Hz (TrueIAQ
control)
•
•
Condensation Protection: 0-100%
Operating RH%: 0% to 99% non-
condensing (TrueIAQ). Outdoor sensor
protected from condensation.
Temp reading range: -40°C to 50°C
(-40°F to 122°F)
Temp accuracy within range: 0.4°C
(0.72°F)
Humidity reading range: 5% to 95%
Humidity temp accurate reading range:
-20°C to 50°C (-17°F to 122°F)
Humidity accuracy over that range:
±4.5%
Maximum real time clock drift over 1
year: 7 minutes
Vertical mount to cover one gang box
Flame Rating: UL94V-0
RoHS compliant
Relay life: 100,000 cycles at 1A 24Vac
•
24Vdc 2-wire over communication bus,
not polarized (outdoor sensor)
Protected against voltage spikes
Not protected against over voltage
connection (ex 120 or 240V)
All setup parameters are stored
indefinitely
•
•
•
•
•
In the Event of Power Failure
•
•
•
Real-time clock is maintained for 4
hours
All outputs are deactivated
All setup parameters are stored
indefinitely
•
•
•
•
Mechanical Design
•
•
•
•
Dimensions: 2-3/4” W x 4-3/4” H x 7/8” D
(TrueIAQ control); 2-3/4” W x 3-3/4” H x 7/8”
D (Outdoor sensor)
Weight: .35 lbs (TrueIAQ control); .15 lbs
(Outdoor sensor)
Temperature Unit Display: °C/°F
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5-year limited warranty
Honeywell warrants this product, excluding battery, 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 prod-
uct is determined 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.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
® U.S. Registered Trademark.
© 2008 Honeywell International Inc.
Patents pending.
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
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