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Modeꢀ 8620 Thermostat with  
Event-based Air Cꢀeaninꢁ and  
Humidity or Ventiꢀation Controꢀ  
Safety &  
Installation  
Instructions  
READ AND SAVE THESE INSTRUCTIONS  
TAblE Of CONTENTS  
INSTAllATION  
SETUp & TESTINg  
Installation location recommendations . . . . . .  
Outdoor temperature sensor (included) . . . . . .  
Remote temperature sensor (optional) . . . . . .  
Thermostat mounting . . . . . . . . . . . . .  
Power & reset options . . . . . . . . . . . .  
Wiring terminal . . . . . . . . . . . . . . .  
2
2
3
3
4
4
Equipment type selection switch (SW1) . . . . .  
Installer setup menu . . . . . . . . . . . . .  
Change system settings . . . . . . . . . . . .  
HVAC installer system settings table . . . . . . 8-9  
Indoor Air Quality system settings tables . . . . 10  
Air cleaning sytem settings table . . . . . . 10  
7
7
7
Humidifier system settings table . . . . . . .  
Dehumidifier system settings table . . . . . .  
10  
11  
WIRINg DIAgRAMS  
Ventilation system settings table . . . . . . 11-12  
Climate map for ASHRAE fresh air setup . . . . 12  
Removal of Indoor Air Quality control buttons . . 13  
Conventional heat/cool single transformer . . . .  
Conventional heat/cool two transformer . . . . . 5  
Heat pump single transformer . . . . . . . . .  
Heat pump two transformer . . . . . . . . . .  
Indoor Air Quality equipment – dehumidifier  
Indoor Air Quality equipment – humidifier  
5
5
5
6
6
6
System test menu . . . . . . . . . . . .  
System test tables . . . . . . . . . . . .  
13-14  
15-16  
REfERENCES  
Indoor Air Quality equipment – ventilation . . . .  
Quick reference to controls & display . . . . . .  
Troubleshooting . . . . . . . . . . . . . .  
Error codes . . . . . . . . . . . . . . . .  
17  
18  
19  
Thermostat features . . . . . . . . . . . . 19  
Specifications . . . . . . . . . . . . . . . 20  
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INSTAllATION  
INSTAllATION  
INSTAllATION lOCATION RECOMMENDATIONS  
Thermostat shouꢀd ꢂe mounted:  
REMOTE TEMpERATURE SENSOR (OpTIONAl)  
Do not mount thermostat:  
A remote temperature sensor can be used if the thermostat has to be mounted in a concealed location A 8051 flush  
mount or 8053 surface mount remote temperature sensor can be attached to the T1 and T2 terminals and mounted  
in a recommended area The remote sensor must be enabled in the installer setup menu When the remote sensor is  
installed it overrides the internal sensor  
On an interior wall, in a frequently occupied space.  
Approximately 5‘ above floor.  
• Behind doors, in corners or other dead air spaces.  
• In direct sunlight, near lighting fixtures, or other  
appliances that give off heat  
At least 18” from outside wall.  
Remote temꢃerature sensor shouꢀd ꢂe mounted:  
On an interior wall, in a frequently occupied space.  
Do not mount remote sensor:  
On an outside or unconditioned area wall.  
Thermostat can be mounted to a vertical junction box.  
• Behind doors, in corners or other dead air spaces.  
In the flow of a supply register, in stairwells, or near  
outside doors  
• Approximately 5‘ above floor.  
• At least 18” from outside wall.  
• In direct sunlight, near lighting fixtures, or other  
appliances that give off heat  
On a wall with concealed pipes or ductwork.  
On an outside or unconditioned area wall.  
Using less than 300’ of wire.  
OUTDOOR TEMpERATURE SENSOR (INClUDED)  
• In the flow of a supply register, in stairwells, or near  
outside doors  
Outdoor temperature can be measured by attaching the included 8052 sensor to the S1 and S2 terminals The  
outdoor sensor must be enabled in the installer setup menu  
On a wall with concealed pipes or ductwork.  
Near 120 VAC lines.  
Heat ꢃumꢃ modeꢀs can use the outdoor temꢃerature to eꢄꢄectiveꢀy utiꢀize the heat ꢃumꢃ:  
When the outdoor temperature is less than the Low Balance Point, the heat pump will be locked out and only  
auxiliary heating will be used.  
When the outdoor temperature is higher than the High Balance Point, the auxiliary heating will be locked out and  
only the heat pump will be used to provide heating  
Indoor Air Quaꢀity ꢄunctions can use the outdoor temꢃerature sensor to:  
Control humidification setpoint based on outdoor temperature to prevent condensation  
Lock out humidification for temperatures over 60°F or below -30°F.  
Lock out ventilation based on high and/or low outdoor temperatures.  
Display outdoor temperature on thermostat.  
I2  
C
I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2  
Outdoor temꢃerature sensor shouꢀd ꢂe mounted:  
THERMOSTAT MOUNTINg  
On side of building out of direct sunlight (north side recommended).  
Above snow line.  
1
2
Remove the rear mounting plate from the thermostat  
Pull wires through the opening on the back of the  
thermostat  
At least 3’ away from exhaust vents and condensing lines.  
Using less than 300’ of wire.  
3
Position and level the mounting plate of the thermostat  
on wall and mark the hole locations with a pencil  
Do not route wires along 120 VAC lines.  
4
5
6
. Drill 1/4” holes and insert supplied anchors  
drywall only)  
(
. Place mounting plate over anchors, insert and tighten  
screws  
Seal wire entry holes to prevent drafts affecting  
temperature readings  
I2  
C
I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2  
2
3
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INSTAllATION  
INSTAllATION  
pOWER & RESET OpTIONS  
CONVENTIONAl HEAT/COOl WIRINg DIAgRAMS  
SINglE TRANSfORMER (USE JUMpER WIRE)  
The thermostat is dual power It can either be AC or  
battery powered, or both (to provide backup power for  
the clock). Batteries are optional if your thermostat was  
wired to run on AC power when installed  
TWO TRANSfORMERS (REMOVE JUMpER WIRE)  
RESET  
BUTTON  
For heat pump systems the C terminal must be connected  
to the common of the 24VAC transformer in order for the  
system fault and emergency heat indicators to operate  
The thermostat has a memory backup that saves the  
thermostat settings in case of a power interruption The  
system settings will be retained but the clock will reset  
after 90 seconds with no battery or AC power  
The reset button located under the battery cover can  
be used to reset the thermostat to factory defaults The  
system settings will also be reset to default  
Note: The reset button is disabled when the thermostat  
is removed from the wall for programming  
I2  
C
I1 O/B Y Y2  
G
RC R W2 W  
L
S2 S1 T1 T2  
I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2  
WIRINg TERMINAl  
HEAT pUMp WIRINg DIAgRAMS  
SINglE TRANSfORMER (USE JUMpER WIRE)  
I1 & I2 – Indoor Air Quality control output  
TWO TRANSfORMERS (REMOVE JUMpER WIRE)  
C – Common (optional when powered by batteries)  
O/b – Reversing valve  
I2  
C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2  
Y – 1st stage cooling / compressor  
Y2 – 2nd stage cooling / compressor  
g – Fan  
1
RC – 24VAC supply cooling  
1
R – 24VAC supply heating  
Wire sꢃeciꢄications:  
8-24 gauge thermostat wire  
W2 – 2nd stage heat / auxiliary  
1
W – 1st stage heat / auxiliary  
l – System fault indicator (optional) (heat pump only)  
S1 & S2 – outdoor temperature sensor (included)  
T1 & T2 – remote temperature sensor (optional)  
Instaꢀꢀation notes:  
Ensure power at the HVAC equipment is off.  
Loosen screw terminals, insert stripped wire and  
1
Jumper between RC & R is used in single transformer systems  
I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2  
I2  
C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2  
re-tighten  
(
see wiring diagrams).  
Push the excess wire back into the opening and plug  
the wall opening to prevent drafts  
4
5
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INSTAllATION  
SETUp & TESTINg  
INDOOR AIR QUAlITY EQUIpMENT WIRINg DIAgRAMS  
EQUIpMENT TYpE SElECTION SWITCH (SW1)  
This thermostat has the option of being used in heat  
pump or heat/cool systems Switch SW1 located on the  
back of the thermostat’s face is used to select this option.  
This setting is displayed in the Installer System Settings  
under Equipment Type  
DEHUMIDIfIER WIRINg  
HUMIDIfIER WIRINg  
SW1  
HEAT/COOL  
HEAT PUMP  
HC  
HP  
Note: Thermostat reboots within 10 seconds after switch  
position is changed  
HC  
HP  
INSTAllER SETUp MENU  
HOW TO ENTER THE INSTAllER SETUp MENU AND SElECT EQUIpMENT TO SETUp:  
In the Installer Setup, HVAC or Indoor Air Quality setup can be selected. If Indoor Air Quality setup is selected, the  
user can then select to set up Air Cleaning, Humidification, Dehumidification or Ventilation.  
I2  
C
I1 O/B Y Y2  
G
RC R W2 W  
L
S2 S1 T1 T2  
I2 C I1 O/B Y Y2 G RC R W2 W L S2 S1 T1 T2  
press [MODE] to set system to OFF.  
press [MENU] to enter main menu  
press  
or  
to adjust the option.  
press [MENU] to exit.  
VENTIlATION WIRINg  
press and hoꢀd [SETUp] for seven seconds, [INSTAll  
SETUp] appears  
press [NEXT] to select option  
If IAQ (Indoor Air Quality) was selected, press  
or  
press [INSTAll SETUp] to enter installer setup menu  
to adjust the Outdoor Sensor setting or IAQ (Indoor  
Air Quality) option  
press [NEXT] to select Outdoor Sensor setting or IAQ  
(
Indoor Air Quality) option  
System Settings can now be changed  
I2  
C
I1 O/B Y Y2  
G
RC R W2 W  
L
S2 S1 T1 T2  
CHANgE SYSTEM SETTINgS  
press [NEXT] or [bACK] to page through the settings  
SETTING  
DESCRIPTION  
SETTING  
NUMBER  
Note: The I1/I2 output is a dry contact closure The humidifier wiring diagram assumes the control is powering a  
solenoid valve The dehumidifier wiring diagram is for a normally open dry contact input The ventilation diagram  
assumes the control is for a normally closed damper. Please see the individual humidifier, dehumidifier or ventilation  
installation instructions for product specific wiring details  
press  
or  
to adjust the setting.  
SETTING  
OPTIONS  
press [DONE] to save and exit, or [CANCEl] to exit  
without saving  
The thermostat will discard changes and exit if nothing  
is pressed within 60 seconds  
To reset the installer settings to the default, reset  
the thermostat by pressing the [RESET] button for 5  
seconds  
6
7
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SETUp & TESTINg  
SETUp & TESTINg  
HVAC INSTAllER SYSTEM SETTINgS TAblE  
HVAC INSTAllER SYSTEM SETTINgS TAblE (CONTINUED)  
The following table contains the system settings and their details Default settings are shown in ꢂoꢀd Some settings  
are only available dependent upon the value of other settings  
factory deꢄauꢀt settinꢁ (ꢂoꢀd)  
and settinꢁ ranꢁe  
System settinꢁ  
Descriꢃtion  
1
2
2
2
9. Fourth Stage Differential 4th stage differential  
1°f (0.5°C)  
factory deꢄauꢀt settinꢁ (ꢂoꢀd)  
1
°F to 9°F (0.5°C to 4.5°C)  
System settinꢁ  
Descriꢃtion  
and settinꢁ ranꢁe  
0. Heat Blast  
Enables the Heat Blast feature.  
Disaꢂꢀe  
Enable  
0
3
0
0 Equipment Type  
1 Reversing Valve  
1 Control Setup  
Equipment type set by SW1  
Heat /Cooꢀ  
Heat Pump  
1. Blast Offset  
2. Screen Lockout  
Amount of heating when Heat Blast is initiated.  
Screen lockout level (Override lockout by holding  
3°f (2°C)  
Selects O or B operation.  
O – On in cooling  
B – On in heating  
3
°F to 5°F (2°C to 3°C)  
Oꢄꢄ  
Part  
Full  
Used to lockout heating or cooling outputs. (Only  
available in Heat/Cool mode )  
Heat and Cooꢀ  
Heat Only  
Cool Only  
[
MENU] for 7 seconds.)  
2
3. Partial Lockout Type  
Select lockout type (Only available when screen  
lockout is set to partial )  
fan/Mode/Setꢃt  
Fan/Setpoints  
0
0
0
0
2. Number of Stages  
3. Aux Heat Stages  
4 Temperature Scale  
Number of equipment stages.  
One  
Two  
Setpoints Only  
Number of auxiliary heat equipment stages.  
Set the thermostat to Fahrenheit or Celsius mode.  
One  
Two  
2
4
2
4. Max Temp Setpoint  
Change In Lockout  
Select temperature setpoint limits (Only available 3 deꢁrees  
when screen lockout is set to partial )  
0 to 20 degrees  
fahrenheit  
Celsius  
1. Max Dehum Setpoint  
Change In Lockout  
Select dehumidification setpoint limits (Only  
available when screen lockout is set to partial )  
5 percent RH  
0 to 15 Percent RH  
5. Heat/Cool: Fan Control  
in Heating  
Heat Pump: Auxiliary  
Equipment Type  
Heat/Cool: Determines if the thermostat or  
equipment controls the fan in heating  
Heat Pump: Auxiliary Equipment type.  
gas/Oiꢀ Heat (equipment controls fan)  
Electric Heat (thermostat controls fan)  
5 Stage Rate  
Accumulation of equipment run time in equipment  
staging determination  
2
1 to 5 or “OFF” to ignore accumulated  
1
5
= more rapid staging of equipment (comfort)  
= slower staging of equipment (economy)  
run time  
0
0
0
3
0
2
1
1
1
1
1
1
1
1
1
6. Extended Fan – Heat  
Extends fan operation after heat call ends.  
Extends fan operation after cool call ends.  
Field adjustment of internal temperature sensor.  
Disaꢂꢀe  
Enable (90 second extension)  
2
7 Progressive Recovery  
Enable or disable progressive recovery  
Disable  
Enaꢂꢀe  
7. Extended Fan – Cool  
Disaꢂꢀe  
Enable (90 second extension)  
2
8. Low Balance Point  
Outdoor temperature low balance point (This  
option is only displayed if the outdoor sensor is  
enabled )  
20°f (-6°C)  
10°F to 50°F (-12°C to 9°C) or OFF to  
8 Internal Temp Sensor  
Offset  
(no offset applied)  
-4°F to +4°F (-2°C to +2°C)  
ignore  
2
9. High Balance Point  
Outdoor temperature high balance point (This  
option is only displayed if the outdoor sensor is  
enabled )  
65°f (18°C)  
5 Internal RH Sensor Offset Field adjustment of internal RH sensor.  
0 (no offset applied)  
40°F to 85°F(3°C to 18°C) or OFF to  
-
5% to +5%  
ignore  
9 Auto Changeover  
6 Deadband  
Enable or disable auto changeover mode  
Auto Changeover mode deadband  
Disaꢂꢀe  
Enable  
30. Program Format  
Select weekly program format  
7-Day (Mon, Tue, Wed, Thu, Fri, Sat, Sun)  
5/1/1 (weekdays, Saturday and Sunday)  
5
/2 Weekdays (weekdays and weekends)  
3°f (2°C)  
Non-Prog  
2
°F to 9°F (1°C to 5°C)  
3
3
2 Events Per Day  
Number of program events per day.  
four  
Two  
0 Remote Sensor  
1 Outdoor Sensor  
Select if remote sensor is attached  
Select if outdoor sensor is attached or not  
No  
Yes  
3 Reset Service Reminders Clears the Change Air Filter and HVAC and  
Dehumidifier Service reminders if they are active  
and resets the start date to the current date  
Clears the Change Water Panel reminder if it is  
active. If the reminder is set to timed, the clock  
will be reset  
No  
Yes  
No  
Yes  
2. Compressor Min Off Time Minimum off time for compressor protection.  
5 minutes  
1
to 5 minutes  
3. Heating Min Off Time  
4. Equipment Min On Time  
5 Auto Changeover Time  
6. First Stage Differential  
Minimum off time for heating.  
2 minutes  
to 5 minutes  
1
37 HVAC Service Reminder  
38. Constant Backlight  
39. Backlight Intensity  
The period for displaying the “HVAC Service  
Reminder” message.  
Oꢄꢄ  
1 to 12 months or “Off” to disable  
Minimum on time for heating and cooling.  
2 minutes  
to 5 minutes  
1
Enable constant, low intensity backlight when  
Disaꢂꢀe  
Enable  
2
4VAC is present  
Minimum time between heating and cooling calls. 4 minutes  
1
to 5 minutes  
Backlight intensity as a percentage of full on.  
100 Percent  
0
to 100 Percent  
1st stage differential  
1°f (0.5°C)  
1
°F to 9°F (0.5°C to 4.5°C)  
40 Auto Daylight Savings  
Enable or disable auto daylight savings  
Off  
March (second Sunday in March to the  
first Sunday in November)  
April (first Sunday in April to the last  
Sunday in October)  
7 Second Stage Differential 2nd stage differential  
8 Third Stage Differential 3rd stage differential  
1°f (0.5°C)  
°F to 9°F (0.5°C to 4.5°C)  
1
1°f (0.5°C)  
°F to 9°F (0.5°C to 4.5°C)  
1
8
9
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SETUp & TESTINg  
SETUp & TESTINg  
INDOOR AIR QUAlITY SYSTEM SETTINgS TAblES  
Dehumidiꢄier System Settinꢁs Taꢂꢀe  
Note: Dehumidifier control can only be set to whole home if ventilation and humidification are not installed  
The following tables contain the Indoor Air Quality system settings and their details Default settings are shown in  
oꢀd Some settings are only present dependent upon the value of other settings  
factory deꢄauꢀt settinꢁ (ꢂoꢀd)  
System settinꢁ  
Descriꢃtion  
and settinꢁ ranꢁe  
The use of the included outdoor temperature sensor (recommended) enables additional Indoor Air Quality functionality  
If the outdoor temperature sensor was not enabled in the HVAC system settings, HVAC system setting 11, outdoor  
sensor, will be presented prior to entering the Indoor Air Quality system settings.  
Dehumidifier Control  
Selects method of dehumidification.(If set to none, no  
other dehumidifier settings will be available )  
None (no dehumidification installed)  
Whole Home  
Air Conditioner  
Please refer to the Model 8620 Owner’s Manual for further information about thermostat features.  
Air Cꢀeaninꢁ System Settinꢁs Taꢂꢀe  
Humidity Setpoint Deadband Select the minimum difference between the humidifier 10 Percent RH  
and dehumidifier setpoints (Only available if  
humidifier mode is set to manual and dehumidifier  
control is set to air conditioner Available in both  
set-ups )  
10 to 20 Percent RH  
factory deꢄauꢀt settinꢁ (ꢂoꢀd)  
and settinꢁ ranꢁe  
System settinꢁ  
Descriꢃtion  
Lockout Dehumidifier During Selects if dehumidification is disabled during a cooling No  
Air Cleaner Installed  
Selects if an air cleaner is installed. (If set to no, no other  
air cleaning settings will be available )  
No  
Yes  
Cooling  
call (Only available if dehumidifier control is set to  
whole home )  
Yes  
Change Air Filter Reminder The period for displaying the “Change Air Filter” message.  
Oꢄꢄ  
Dehumidifier Forces Fan  
Select if dehumidification can turn on the fan (Only  
No  
1
to 12 months or “Off” to disable  
available if dehumidifier control is set to whole home ) Yes  
Dehumidifier Service  
Reminder  
The period for displaying the “Dehum Service  
Reminder” message. (Only available if dehumidifier  
control is set to whole home )  
Oꢄꢄ  
Humidiꢄier System Settinꢁs Taꢂꢀe  
1 to 12 months or “Off” to disable  
Note: A humidifier can only be installed if ventilation is not installed and dehumidifier control is not set to whole home  
Dehumidifier Overcooling  
Selects the amount of overcooling that can occur  
for dehumidification (Only available if dehumidifier  
control is set to air conditioner )  
3°f (1.5°C)  
factory deꢄauꢀt settinꢁ (ꢂoꢀd)  
Limit  
1°F to 3°F (0.5°C to 1.5°C)  
System settinꢁ  
Descriꢃtion  
and settinꢁ ranꢁe  
Humidifier Installed  
Selects if a humidifier is installed. (If set to no, no other  
humidifier settings will be available )  
No  
Yes  
Auto  
Manual  
Dehumidify in Vacation  
Mode  
Selects if dehumidification with the air conditioner is  
No  
done in Vacation Mode. (Only available if dehumidifier Yes  
Humidifier Mode  
Selects auto or manual mode Auto mode controls humidity  
based on the humidity setting and outdoor temperature  
Manual mode controls humidity based on the %RH setpoint.  
control is set to air conditioner  
Vacation Dehumidifier Low  
Temp Limit  
Sets the lowest temperature the air conditioner will cool 75°f (24°C)  
to meet RH setpoint in Vacation Mode. (Only available if 70°F to 85°F (21°C to 29°C)  
dehumidifier control is set to air conditioner )  
(Auto mode is only available if outdoor sensor is set to yes )  
Humidity Setpoint  
Deadband  
Select the minimum difference between the humidifier  
and dehumidifier setpoints (Only available if humidifier  
mode is set to manual and dehumidifier control is set to air  
conditioner Available in both set-ups )  
10 Percent RH  
10 to 20 Percent RH  
Ventiꢀation System Settinꢁs Taꢂꢀe  
Note: Ventilation can only be installed if humidification is not installed and dehumidifier control is not set to whole home  
Humidifier Operation  
Selects when humidification is allowed to occur relative to  
heating and fan operation  
Heat Onꢀy  
Heat or Fan  
Forces Fan  
factory deꢄauꢀt settinꢁ (ꢂoꢀd)  
System settinꢁ  
Descriꢃtion  
and settinꢁ ranꢁe  
Change Water Panel  
Reminder  
Selects the when the “Change Water Panel” message is  
Oꢄꢄ  
Fresh Air Vent Installed Selects if ventilation is installed  
No  
displayed  
1 Per Season  
(
If set to no, no other ventilation settings will be available.)  
Yes  
2
3
6
Per Season  
00 Hours  
00 Hours  
Fresh Air Forces Fan  
Fresh Air Setup  
Selects if ventilation forces the fan on  
No  
Yes  
Reminder Month (Change  
Change Water Panel Reminder set to 1 per Season:  
Octoꢂer  
Selects if ventilation is configured through the ASHRAE setup  
or Timed. If ASHRAE setup is selected, the hourly ventilation  
time will be calculated using the ASHRAE recommendations  
If Timed set-up is selected, the hourly ventilation time will be  
determined based on the Fresh Air Time value.  
Timed  
ASHRAE  
Water Panel Reminder set Determines the month the “Change Water Panel” message November  
to 1 per Season)  
is displayed  
December  
January  
February  
March  
April  
First Reminder Month  
Change Water Panel Reminder set to 2 per Season:  
Determines the first month the “Change Water Panel”  
message is displayed  
(
Change Water Panel  
Fresh Air Time  
Selects how many minutes per hour that ventilation will be  
active (Only available if fresh air setup is set to timed )  
30 MIN/HR  
0 to 60 MIN/HR  
Reminder set to 2 per  
Season)  
May  
High Limit Outdoor  
Temp  
Selects if ventilation is disabled if the outdoor temperature  
No  
June  
exceeds the outdoor high limit. (Only available if fresh air setup Yes  
July  
is set to timed and an outdoor temperature sensor is installed )  
August  
September  
Outdoor High Limit  
Sets the high temperature limit for ventilation (Only available if 100°f (38°C)  
high limit outdoor temp set to yes )  
Second Reminder Start  
Month  
Determines the second month the “Change Water Panel”  
message is displayed (Only available when Change Water  
Panel Reminder set to 2 per Season )  
October  
November  
December  
January  
February  
March  
90°F to 100°F (32°C to 38°C)  
Low Limit Outdoor Temp Selects if ventilation is disabled if the outdoor temperature  
No  
exceeds the outdoor low limit. (Only available if fresh air setup Yes  
is set to timed and an outdoor temperature sensor is installed )  
Outdoor Low Limit  
High Limit Indoor RH  
Indoor RH Limit  
Sets the low temperature limit for ventilation (Only available if 10°f (-11°C)  
low limit outdoor temp set to yes )  
-10°F to 30°F (-23°C to -1°C)  
April  
May  
Selects if ventilation is disabled if the indoor RH exceeds the  
indoor RH limit (Only available if fresh air setup is set to timed ) Yes  
No  
June  
July  
Sets the high indoor RH limit for ventilation (Only available if  
high limit indoor RH is set to yes )  
60%  
50% to 70%  
August  
September  
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SETUp & TESTINg  
SETUp & TESTINg  
Ventiꢀation System Settinꢁs Taꢂꢀe (continued)  
REMOVAl Of INDOOR AIR QUAlITY CONTROl bUTTONS  
factory deꢄauꢀt settinꢁ (ꢂoꢀd)  
and settinꢁ ranꢁe  
If any of the Indoor Air Quality control features are not installed, the corresponding button can be removed using the  
following procedure:  
System settinꢁ  
Descriꢃtion  
Number of Bedrooms  
Selects the number of bedrooms to be used for the ASHRAE  
3 bedrooms  
calculation (Only available if fresh air setup is set to ASHRAE ) 1 to 6 Bedrooms  
Steꢃ 1: Verify the specific Indoor Air  
Quality control feature is not  
installed in the installer set-up  
Number of Occupants  
Home Size  
Selects the number of occupants to be used for the ASHRAE  
4 Occuꢃants  
calculation (Only available if fresh air setup is set to ASHRAE ) 1 to 10 Occupants  
INDOOR  
(
see pages 10-12)  
AIR QUALITY  
CONTROL  
Selects the home size to be used for the ASHRAE calculation  
Only available if fresh air setup is set to ASHRAE )  
2500 SQ fT  
1000 to 5000 SQ FT  
(
Steꢃ 2: From the home screen (see  
page 17), ꢃress and hoꢀd the  
IAQ button for 7 seconds  
BUTTONS  
Fresh Air CFM  
Select Climate  
Selects the ventilation CFM to be used for the ASHRAE  
60 CfM  
calculation (Only available if fresh air setup is set to ASHRAE ) 30 to 200 CFM  
Selects the climate to be used for the ASHRAE calculation  
Normaꢀ  
Very Hot/Humid  
Very Cold  
Steꢃ 3: The message center will  
display REMOVE BUTTON and  
the options of NO and YES  
(
Only available if fresh air setup is set to ASHRAE ) To  
determine what region you are in, refer to the map below.  
ASHRAE Cycle Time  
Displays the Fresh Air Time calculated by the ASHRAE  
standard (Only displayed if fresh air setup is set to ASHRAE )  
Minutes/Hour  
(
NO will be flashing).  
Steꢃ 4: press  
or to select YES  
Steꢃ 5: press [DONE]  
Steꢃ 6: The button is now removed  
Note: Once the button is removed it can be brought back by installing the corresponding Indoor Air Quality feature  
Note: In ASHRAE set-up temperature and humidity limits are disabled  
Note: Refer to manuals for humidifier, dehumidifier, air cleaner and ventilation products for recommended  
installation and operation  
(
see pages 10-12)  
ClIMATE MAp fOR ASHRAE fRESH AIR SETUp  
SYSTEM TEST MENU  
The system test menu is used to test a system after installation The outputs of the thermostat can be manually  
activated to test their function The instructions below show how to enter the test mode and turn outputs on and off  
HOW TO ENTER THE SYSTEM TEST MENU:  
SYSTEM TEST STEpS  
VERY COlD  
press [MODE] to set system to off  
Heating equipment test  
Cooling equipment test  
press and hoꢀd [fAN] and [MODE] for three seconds  
to enter system test mode  
Fan equipment test  
Humidification equipment test  
Dehumidification equipment test  
Ventilation equipment test  
The first screen of the installer test displays the  
equipment configuration  
press [NEXT] to enter the first installation test or  
[
CANCEl] to exit.  
HUMIDITY  
TEMPERATURE  
VERY HOT/HUMID  
OUTDOOR  
TEMPERATURE  
EQUIPMENT  
CONFIGURATION  
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SETUp & TESTINg  
SETUp & TESTINg  
SYSTEM TEST MENU (CONTINUED)  
SYSTEM TEST TAblES  
Each equipment test will begin with the selection of turning on the output or stage as shown below  
Heat / Cooꢀ Heatinꢁ Equiꢃment Test  
press  
or  
to change the selection  
Heat Tyꢃe  
W
ON  
ON  
W2  
Y
Y2  
g
press [NEXT] to accept the selection and proceed to the next step.  
Gas  
Gas  
1st Stage Test  
2nd Stage Test  
ON  
If YES is selected, the thermostat will test the corresponding output. If NO is selected, the thermostat will proceed  
to the next step.  
Electric  
Electric  
1st Stage Test  
2nd Stage Test  
ON  
ON  
ON  
ON  
ON  
HUMIDITY  
Heat pumꢃ Heatinꢁ Equiꢃment Test (Eꢀectric Heat)  
TEMPERATURE  
O/b set to  
Comꢃressor  
Staꢁes  
Aux  
OUTDOOR  
TEMPERATURE  
Staꢁes  
W
W2  
Y
Y2  
O
b
g
EQUIPMENT TEST  
SELECTION  
1
1
1
1
1st Stage Test  
2nd Stage Test  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
TEST TO BE RUN  
2
2
2
1
1
1
1st Stage Test  
2nd Stage Test  
3rd Stage Test  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
1
1
1
2
2
2
1st Stage Test  
2nd Stage Test  
3rd Stage Test  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
While the equipment test is active the corresponding test information will be shown  
2
2
2
2
2
2
2
2
1st Stage Test  
2nd Stage Test  
3rd Stage Test  
4th Stage Test  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
press [NEXT] to accept the selection and proceed to the next test selection.  
ON  
ON  
ON  
ON  
ON  
Note: System Variable 31, O/B operation selects O or B.  
HUMIDITY  
TEMPERATURE  
Heat pumꢃ Heatinꢁ Equiꢃment Test (gas Heat)  
OUTDOOR  
TEMPERATURE  
O/b set to  
Comꢃressor  
Staꢁes  
Aux  
Staꢁes  
W
W2  
Y
Y2  
O
b
g
1
1
1
1
1st Stage Test  
2nd Stage Test  
ON  
ON  
ON  
ON  
EQUIPMENT TEST  
SELECTION  
OUTPUT STATUS  
ON  
TEST THAT  
IS ACTIVE  
2
2
2
1
1
1
1st Stage Test  
2nd Stage Test  
3rd Stage Test  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
1
1
1
2
2
2
1st Stage Test  
2nd Stage Test  
3rd Stage Test  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
2
2
2
2
2
2
2
2
1st Stage Test  
2nd Stage Test  
3rd Stage Test  
4th Stage Test  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
ON  
Note: System Variable 31, O/B operation selects O or B.  
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SETUp & TESTINg  
QUICK REfERENCE TO CONTROlS & DISplAY  
SYSTEM TEST TAblES (CONTINUED)  
HOME SCREEN  
ROOM TEMPERATURE  
CURRENT DAY OUTDOOR TEMPERATURE ROOM RELATIVE HUMIDITY  
TEMPERATURE SETTING  
Heat / Cooꢀ Cooꢀinꢁ Equiꢃment Test  
AIR CLEANING BUTTON  
W
W2  
Y
Y2  
g
FAN MODE  
BUTTON  
(
ENTERS EVENT-BASED AIR  
1
st Stage Test  
ON  
ON  
ON  
ON  
CLEANING CONTROL SCREEN)  
2
nd Stage Test  
ON  
FAN MODE  
SETTING  
HUMIDITY CONTROL BUTTON  
(ENTERS HUMIDITY CONTROL  
SCREEN)  
Heat pumꢃ Cooꢀinꢁ Equiꢃment Test  
SYSTEM MODE  
BUTTON  
FRESH AIR BUTTON (ENTERS  
VENTILATION CONTROL SCREEN)  
O/b set to  
W
W2  
Y
Y2  
O
b
g
SYSTEM MODE  
SETTING  
TEMPERATURE ADJUSTMENT  
INDICATORS SHOW THROUGH HOUSING  
HEAT pUMp ONlY  
EMERGENCY HEAT OR  
AUXILIARY HEAT (RED)  
1
st Stage Test  
ON  
ON  
ON  
ON  
ON  
ON  
2
nd Stage Test  
ON  
EQUIPMENT  
STATUS  
Note: System Variable 31, O/B operation selects O or B.  
SYSTEM FAULT (YELLOW)  
MESSAGE  
CENTER  
fan Equiꢃment Test  
(
SCROLLING TEXT)  
HOLD BUTTON  
W
W2  
Y
Y2  
g
(
SETS OR CLEARS HOLD)  
ON  
LOW BATTERY  
INDICATOR  
CURRENT TIME & DATE MAIN MENU BUTTON  
HEAT BLAST BUTTON  
Humidiꢄication Equiꢃment Test  
I1/I2  
g
NOTE: BACKLIGHT IS ACTIVATED WITH FIRST BUTTON PRESS AND AUTOMATICALLY TURNS OFF.  
ON  
ON  
Dehumidiꢄication Equiꢃment Test  
Ventiꢀation Equiꢃment Test  
MAIN MENU  
I1/I2  
g
ON  
ON  
I1/I2  
g
ON  
ON  
SET VACATION HOLD  
HOLD–TO TIME AND DATE)  
SET SCHEDULE  
BUTTON  
(
SET CURRENT  
TIME AND DATE  
CLEAN SCREEN  
DONE BUTTON  
(
LOCKOUT TOUCH  
(
EXIT MENU)  
SCREEN FOR 30  
SECONDS)  
USER SYSTEM SETTINGS  
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TROUblESHOOTINg  
ERROR CODES  
If the thermostat enters an error mode, all outputs are turned off. The thermostat attempts to recover every 10 minutes.  
If the error does not clear, use the reset button. This will return all settings back to factory default.  
DISplAY IS blANK  
HEAT pUMp ISSUES COOl AIR IN HEAT MODE,  
OR WARM AIR IN COOl MODE  
Check circuit breaker and reset if necessary.  
Check System Setting 31 (O/B Operation) to make  
sure the reversing valve operation matches the heat  
pump  
Error code  
Messaꢁe  
Error Descriꢃtion  
Make sure power switch at heating & cooling  
system is on  
01  
Open temperature sensor circuit  
Shorted temperature sensor circuit  
Error in permanent memory  
“SENSOR ERROR”  
“EEPROM ERROR”  
Make sure furnace door is closed securely.  
0
2
If thermostat is battery powered, make sure fresh AA  
alkaline batteries are correctly installed  
HEAT/COOl bOTH ON AT SAME TIME  
04  
Check SW1 (Equipment Type), to make sure it is set  
to match the installed heating/cooling equipment  
TEMpERATURE SETTINgS DO NOT CHANgE  
(
see page 8)  
Make sure heating and cooling temperatures are set to  
acceptable ranges:  
THERMOSTAT fEATURES  
Check to make sure heating and cooling wires are  
not shorted together  
Indoor air quality control.  
• Dual power option (24VAC or battery).  
Heat: 40° to 90°F (4° to 32°C).  
Cool: 50° to 99°F (10° to 37°C).  
Humidification automatic or manual control  
Front battery door access for fast, easy replacement.  
HEATINg EQUIpMENT IS RUNNINg IN  
COOl MODE  
– Dehumidification  
– Event-Based air cleaning  
• Displays room temperature, room humidity,  
temperature setting, and outdoor temperature.  
HEATINg SYSTEM DOES NOT RESpOND  
– Ventilation with temperature and humidity limits  
Check SW1 (Equipment Type), to make sure it is set  
to match the installed heating/cooling equipment  
(see page 8)  
(
“HEATINg” AppEARS ON SCREEN)  
Temperature control.  
• Air filter, humidifier, dehumidifier, and HVAC service  
reminders  
Check for 24VAC at the equipment on the secondary  
side of the transformer between power and  
common. If voltage is not present, check the heating  
equipment to find the cause of the problem  
Heat Blast raises the room temperature 3°F to 5°F.  
• Programmable fan control with fan circulation mode.  
Large touch screen with adjustable backlight –  
constant backlight option available  
HEATINg” IS NOT DISplAYED  
• Easy to use temperature control can override program  
schedule at any time  
Check for 24VAC between the heat terminal (W)  
and the transformer common. If 24VAC is present,  
the thermostat is functional Check the heating  
equipment to find the cause of the problem  
• Check Installer System Setting number 01  
Message center provides feedback and instructions.  
(Control Setup) is set correctly  
Progressive recovery ensures proper temperature at  
7 day programmability or separately programmable  
weekday/weekend schedules  
the start of a program event  
Change the System Mode to Heat, and set  
the temperature level above the current room  
temperature  
• Built in compressor protection prevents damage to  
your equipment  
Thermostat can be removed from the wall for easy  
programming (batteries must be installed)  
Check for loose or broken wires between the  
thermostat and the heating equipment  
System test mode.  
COOlINg” IS NOT DISplAYED  
COOlINg SYSTEM DOES NOT RESpOND  
Check Installer System Setting number 01  
(
“COOlINg” AppEARS ON SCREEN)  
(
Control Setup) is set correctly  
Check for 24VAC at the equipment on the secondary  
side of the transformer between power and  
common. If voltage is not present, check the cooling  
equipment to find the cause of the problem  
Change the System Mode to Cool, and set  
the temperature level below the current room  
temperature  
Check for 24VAC between the cooling terminal (Y)  
and the transformer common. If 24VAC is present,  
the thermostat is functional Check the cooling  
system to find the cause of the problem  
HUMIDIfIER DOES NOT OpERATE IN  
AUTO MODE  
Check Installer System Setting number 11 (Outdoor  
Sensor) is set to yes  
Check for loose or broken wires between the  
thermostat and the cooling equipment  
Verify that the outdoor sensor is functioning  
correctly If the sensor is functioning correctly the  
outdoor temperature will display in the outdoor  
temperature location (see Home Screen on page 17  
for the location)  
fAN DOES NOT TURN ON IN A CAll fOR HEAT  
Check System Setting 05 (Fan Control), to make sure  
the fan control is properly set to match the type of  
system (see page 8)  
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SpECIfICATIONS  
Environment  
Operating: 32° to 120°F (0° to 48.9°C)  
Shipping: -30° to 150°F (-34.4° to 65.5°C)  
Temperature  
Relative humidity  
Operating: 5% to 90% R H (non-condensing)  
Eꢀectricaꢀ  
Operating voltage  
Current  
24VAC (18 – 30VAC)  
Maximum: 2.5A (total), 1.0A (single output)  
Maximum surge current: 5A  
Dual power Can be battery or 24VAC powered  
Power supply  
When both the sources are available, battery will be used as  
back up power  
Battery power: AA size alkaline battery x 2  
Battery life: Approximately 1 year  
Battery power  
Thermaꢀ  
Outdoor & Remote temperature sensor  
Room temperature measurement  
Outdoor temperature measurement  
Maximum distance: 300 feet  
Display range: 32° to 99°F (0° to 40°C)  
Display range: -20° to 130°F (-30° to 55°C)  
Heat: 40° to 90°F (4° to 32°C)  
Cool: 50° to 99°F (10° to 37°C)  
Setpoint temperature range  
Setpoint humidity range  
Humidification: 10% to 50% R H  
Dehumidification: 40% to 90% R H  
P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357  
www.aꢃriꢀaireꢃartners.com  
1
0009857 4 12  
U.S. Patent Number 8,146,376 (and other patents pending)  
© 2012 Aprilaire – A division of Research Products Corporation  
B2205748A  
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