INSTALLATION LOCATION RECOMMENDATIONS
Thermostat should be mounted:
Do not mount thermostat:
OUTDOOR TEMPERATURE SENSOR (INCLUDED)
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.
Heat pump models can use the outdoor temperature to effectively utilize the heat pump:
Indoor Air Quality functions can use the outdoor temperature sensor to:
Outdoor temperature sensor should be mounted:
REMOTE TEMPERATURE SENSOR (OPTIONAL)
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.
Remote temperature sensor should be mounted:
Do not mount remote sensor:
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.
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.
Wire specifications:
18-24 gauge thermostat wire
Installation notes:
CONVENTIONAL HEAT/COOL WIRING DIAGRAMS
HEAT PUMP WIRING DIAGRAMS
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.
Note: Thermostat reboots within 10 seconds after switch position is changed.
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.
CHANGE SYSTEM SETTINGS
HVAC INSTALLER SYSTEM SETTINGS TABLE
The following table contains the system settings and their details. Default settings are shown in bold. Some settings are only available dependent upon the value of other settings.
System setting | Description | factory default setting (bold) and setting range |
00 . Equipment Type | Equipment type set by SW1 . | Heat /Cool Heat Pump |
31 . Reversing Valve | Selects O or B operation. | O – On in cooling B – On in heating |
01 . Control Setup | Used to lockout heating or cooling outputs. (Only available in Heat/Cool mode .) | Heat and Cool Heat Only Cool Only |
02. Number of Stages | Number of equipment stages. | One Two |
03. Aux Heat Stages | Number of auxiliary heat equipment stages. | One Two |
04 . Temperature Scale | Set the thermostat to Fahrenheit or Celsius mode. | fahrenheit Celsius |
05. 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/Oil Heat (equipment controls fan) Electric Heat (thermostat controls fan) |
06. Extended Fan – Heat | Extends fan operation after heat call ends. | Disable Enable (90 second extension) |
07. Extended Fan – Cool | Extends fan operation after cool call ends. | Disable Enable (90 second extension) |
08 . Internal Temp Sensor Offset | Field adjustment of internal temperature sensor. | 0° (no offset applied) -4°F to +4°F (-2°C to +2°C) |
35 . Internal RH Sensor Offset | Field adjustment of internal RH sensor. | 0 (no offset applied) -5% to +5% |
09 . Auto Changeover | Enable or disable auto changeover mode . | Disable Enable |
26 . Deadband | Auto Changeover mode deadband . | 3°f (2°C) 2°F to 9°F (1°C to 5°C) |
10 . Remote Sensor | Select if remote sensor is attached . | No Yes |
11 . Outdoor Sensor | Select if outdoor sensor is attached or not . | No Yes |
12. Compressor Min Off Time | Minimum off time for compressor protection. | 5 minutes 1 to 5 minutes |
13. Heating Min Off Time | Minimum off time for heating. | 2 minutes 1 to 5 minutes |
14. Equipment Min On Time | Minimum on time for heating and cooling. | 2 minutes 1 to 5 minutes |
15 . Auto Changeover Time | Minimum time between heating and cooling calls. | 4 minutes 1 to 5 minutes |
16. First Stage Differential | 1st stage differential . | 1°f (0.5°C) 1°F to 9°F (0.5°C to 4.5°C) |
17 . Second Stage Differential | 2nd stage differential . | 1°f (0.5°C) 1°F to 9°F (0.5°C to 4.5°C) |
18 . Third Stage Differential | 3rd stage differential . | 1°f (0.5°C) 1°F to 9°F (0.5°C to 4.5°C) |
System setting | Description | factory default setting (bold) and setting range |
19. Fourth Stage Differential | 4th stage differential . | 1°f (0.5°C) 1°F to 9°F (0.5°C to 4.5°C) |
20. Heat Blast | Enables the Heat Blast feature. | Disable Enable |
21. Blast Offset | Amount of heating when Heat Blast is initiated. | 3°f (2°C) 3°F to 5°F (2°C to 3°C) |
22. Screen Lockout | Screen lockout level . (Override lockout by holding [MENU] for 7 seconds.) | Off Part Full |
23. Partial Lockout Type | Select lockout type . (Only available when screen lockout is set to partial .) | fan/Mode/Setpt Fan/Setpoints Setpoints Only |
24. Max Temp Setpoint Change In Lockout | Select temperature setpoint limits . (Only available when screen lockout is set to partial .) | 3 degrees 0 to 20 degrees |
41. 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 |
25 . Stage Rate | Accumulation of equipment run time in equipment staging determination . 1 = more rapid staging of equipment (comfort) 5 = slower staging of equipment (economy) | 2 1 to 5 or “OFF” to ignore accumulated run time . |
27 . Progressive Recovery | Enable or disable progressive recovery . | Disable Enable |
28. 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 ignore |
29. High Balance Point | Outdoor temperature high balance point . (This option is only displayed if the outdoor sensor is enabled .) | 65°f (18°C) 40°F to 85°F(3°C to 18°C) or OFF to ignore |
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) Non-Prog |
32 . Events Per Day | Number of program events per day. | four Two |
33 . 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 |
37 . HVAC Service Reminder | The period for displaying the “HVAC Service Reminder” message. | Off 1 to 12 months or “Off” to disable |
38. Constant Backlight | Enable constant, low intensity backlight when 24VAC is present . | Disable Enable |
39. Backlight Intensity | Backlight intensity as a percentage of full on. | 100 Percent 0 to 100 Percent |
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) |
INDOOR AIR QUALITY SYSTEM SETTINGS TABLES
The following tables contain the Indoor Air Quality system settings and their details. Default settings are shown in bold. Some settings are only present dependent upon the value of other settings.
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.
Please refer to the Model 8620 Owner’s Manual for further information about thermostat features.
Air Cleaning System Settings Table
System setting | Description | factory default setting (bold) and setting range |
Air Cleaner Installed | Selects if an air cleaner is installed. (If set to no, no other air cleaning settings will be available .) | No Yes |
Change Air Filter Reminder | The period for displaying the “Change Air Filter” message. | Off 1 to 12 months or “Off” to disable |
Humidifier System Settings Table
Note: A humidifier can only be installed if ventilation is not installed and dehumidifier control is not set to whole home.
System setting | Description | factory default setting (bold) and setting range |
Humidifier Installed | Selects if a humidifier is installed. (If set to no, no other humidifier settings will be available .) | No 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. (Auto mode is only available if outdoor sensor is set to yes .) | Auto Manual |
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 |
Humidifier Operation | Selects when humidification is allowed to occur relative to heating and fan operation . | Heat Only Heat or Fan Forces Fan |
Change Water Panel Reminder | Selects the when the “Change Water Panel” message is displayed . | Off 1 Per Season 2 Per Season 300 Hours 600 Hours |
Reminder Month (Change Water Panel Reminder set to 1 per Season)
First Reminder Month (Change Water Panel Reminder set to 2 per Season) | Change Water Panel Reminder set to 1 per Season: Determines the month the “Change Water Panel” message is displayed .
Change Water Panel Reminder set to 2 per Season: Determines the first month the “Change Water Panel” message is displayed . | October November December January February March April May June July August September |
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 April May June July August September |
Dehumidifier System Settings Table
Note: Dehumidifier control can only be set to whole home if ventilation and humidification are not installed.
System setting | Description | factory default setting (bold) and setting range |
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 |
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 |
Lockout Dehumidifier During Cooling | Selects if dehumidification is disabled during a cooling call . (Only available if dehumidifier control is set to whole home .) | No Yes |
Dehumidifier Forces Fan | Select if dehumidification can turn on the fan . (Only available if dehumidifier control is set to whole home .) | No Yes |
Dehumidifier Service Reminder | The period for displaying the “Dehum Service Reminder” message. (Only available if dehumidifier control is set to whole home .) | Off 1 to 12 months or “Off” to disable |
Dehumidifier Overcooling Limit | 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) 1°F to 3°F (0.5°C to 1.5°C) |
Dehumidify in Vacation Mode | Selects if dehumidification with the air conditioner is done in Vacation Mode. (Only available if dehumidifier control is set to air conditioner . | No Yes |
Vacation Dehumidifier Low Temp Limit | Sets the lowest temperature the air conditioner will cool to meet RH setpoint in Vacation Mode. (Only available if dehumidifier control is set to air conditioner .) | 75°f (24°C) 70°F to 85°F (21°C to 29°C) |
Ventilation System Settings Table
Note: Ventilation can only be installed if humidification is not installed and dehumidifier control is not set to whole home.
System setting | Description | factory default setting (bold) and setting range |
Fresh Air Vent Installed | Selects if ventilation is installed . (If set to no, no other ventilation settings will be available.) | No Yes |
Fresh Air Forces Fan | Selects if ventilation forces the fan on . | No Yes |
Fresh Air Setup | 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 |
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 |
High Limit Outdoor Temp | Selects if ventilation is disabled if the outdoor temperature exceeds the outdoor high limit. (Only available if fresh air setup is set to timed and an outdoor temperature sensor is installed .) | No Yes |
Outdoor High Limit | Sets the high temperature limit for ventilation . (Only available if high limit outdoor temp set to yes .) | 100°f (38°C) 90°F to 100°F (32°C to 38°C) |
Low Limit Outdoor Temp | Selects if ventilation is disabled if the outdoor temperature exceeds the outdoor low limit. (Only available if fresh air setup is set to timed and an outdoor temperature sensor is installed .) | No Yes |
Outdoor Low Limit | Sets the low temperature limit for ventilation . (Only available if low limit outdoor temp set to yes .) | 10°f (-11°C) -10°F to 30°F (-23°C to -1°C) |
High Limit Indoor RH | Selects if ventilation is disabled if the indoor RH exceeds the indoor RH limit . (Only available if fresh air setup is set to timed .) | No Yes |
Indoor RH Limit | Sets the high indoor RH limit for ventilation . (Only available if high limit indoor RH is set to yes .) | 60% 50% to 70% |
System setting | Description | factory default setting (bold) and setting range |
Number of Bedrooms | Selects the number of bedrooms to be used for the ASHRAE calculation . (Only available if fresh air setup is set to ASHRAE .) | 3 bedrooms 1 to 6 Bedrooms |
Number of Occupants | Selects the number of occupants to be used for the ASHRAE calculation . (Only available if fresh air setup is set to ASHRAE .) | 4 Occupants 1 to 10 Occupants |
Home Size | 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 |
Fresh Air CFM | Selects the ventilation CFM to be used for the ASHRAE calculation . (Only available if fresh air setup is set to ASHRAE .) | 60 CfM 30 to 200 CFM |
Select Climate | Selects the climate to be used for the ASHRAE calculation . (Only available if fresh air setup is set to ASHRAE .) To determine what region you are in, refer to the map below. | Normal Very Hot/Humid Very Cold |
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 |
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.
CLIMATE MAP FOR ASHRAE FRESH AIR SETUP
Removal of Indoor Air Quality Control Buttons
If any of the Indoor Air Quality control features are not installed, the corresponding button can be removed using the following procedure:
Note: Once the button is removed it can be brought back by installing the corresponding Indoor Air Quality feature (see pages 10-12).
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
Heating equipment test Cooling equipment test Fan equipment test Humidification equipment test Dehumidification equipment test Ventilation equipment test
Each equipment test will begin with the selection of turning on the output or stage as shown below.
Press or to change the selection.
Press [NEXT] to accept the selection and proceed to the next step.
If YES is selected, the thermostat will test the corresponding output. If NO is selected, the thermostat will proceed to the next step.
Heat / Cool Heating Equipment Test | ||||||
Heat Type | W | W2 | Y | Y2 | g | |
Gas | 1st Stage Test | ON | ||||
Gas | 2nd Stage Test | ON | ON | |||
Electric | 1st Stage Test | ON | ON | |||
Electric | 2nd Stage Test | ON | ON | ON |
Heat pump Heating Equipment Test (Electric Heat) | |||||||||
Compressor Stages | Aux Stages | W | W2 | Y | Y2 | O/b set to | g | ||
O | b | ||||||||
1 | 1 | 1st Stage Test | ON | ON | ON | ||||
1 | 1 | 2nd Stage Test | ON | ON | ON | ON | |||
2 | 1 | 1st Stage Test | ON | ON | ON | ||||
2 | 1 | 2nd Stage Test | ON | ON | ON | ON | |||
2 | 1 | 3rd Stage Test | ON | ON | ON | ON | ON | ||
1 | 2 | 1st Stage Test | ON | ON | ON | ||||
1 | 2 | 2nd Stage Test | ON | ON | ON | ON | |||
1 | 2 | 3rd Stage Test | ON | ON | ON | ON | ON | ||
2 | 2 | 1st Stage Test | ON | ON | ON | ||||
2 | 2 | 2nd Stage Test | ON | ON | ON | ON | |||
2 | 2 | 3rd Stage Test | ON | ON | ON | ON | ON | ||
2 | 2 | 4th Stage Test | ON | ON | ON | ON | ON | ON |
Note: System Variable 31, O/B operation selects O or B.
Heat pump Heating Equipment Test (gas Heat) | |||||||||
Compressor Stages | Aux Stages | W | W2 | Y | Y2 | O/b set to | g | ||
O | b | ||||||||
1 | 1 | 1st Stage Test | ON | ON | ON | ||||
1 | 1 | 2nd Stage Test | ON | ON | |||||
2 | 1 | 1st Stage Test | ON | ON | ON | ||||
2 | 1 | 2nd Stage Test | ON | ON | ON | ON | |||
2 | 1 | 3rd Stage Test | ON | ON | |||||
1 | 2 | 1st Stage Test | ON | ON | ON | ||||
1 | 2 | 2nd Stage Test | ON | ON | |||||
1 | 2 | 3rd Stage Test | ON | ON | ON | ||||
2 | 2 | 1st Stage Test | ON | ON | ON | ||||
2 | 2 | 2nd Stage Test | ON | ON | ON | ON | |||
2 | 2 | 3rd Stage Test | ON | ON | |||||
2 | 2 | 4th Stage Test | ON | ON | ON |
Note: System Variable 31, O/B operation selects O or B.
Heat / Cool Cooling Equipment Test | |||||
W | W2 | Y | Y2 | g | |
1st Stage Test | ON | ON | |||
2nd Stage Test | ON | ON | ON |
Heat pump Cooling Equipment Test | |||||||
W | W2 | Y | Y2 | O/b set to | g | ||
O | b | ||||||
1st Stage Test | ON | ON | ON | ||||
2nd Stage Test | ON | ON | ON | ON |
Note: System Variable 31, O/B operation selects O or B.
fan Equipment Test | ||||
W | W2 | Y | Y2 | g |
ON |
Humidification Equipment Test | |
I1/ I2 | g |
ON | ON |
Dehumidification Equipment Test | |
I1/ I2 | g |
ON | ON |
Ventilation Equipment Test | |
I1/ I2 | g |
ON | ON |
HOME SCREEN
MAIN MENU
DISPLAY IS BLANK
Temperature settings do not change
Make sure heating and cooling temperatures are set to acceptable ranges:
Heatin g system does not respond
(“HEATING” appears on screen)
Cooling system does not respond
(“COOLING” appears on screen)
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).
Heat pump issues cool air in heat mode, or warm air in cool mode
Check System Setting 31 (O/B Operation) to make sure the reversing valve operation matches the heat pump.
Heat /cool both on at same time
Heatin g equipment is running in cool mode
Check SW1 (Equipment Type), to make sure it is set to match the installed heating/cooling equipment (see page 8).
“HEATING” is not displayed
“COOLING” is not displayed Humidifier does not operate in Auto Mode
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.
Error code | Message | Error Description |
01 | “SENSOR ERROR” | Open temperature sensor circuit |
02 | Shorted temperature sensor circuit | |
04 | “EEPROM ERROR” | Error in permanent memory |
Environment | |
Temperature | Operating: 32° to 120°F (0° to 48.9°C) Shipping: -30° to 150°F (-34.4° to 65.5°C) |
Relative humidity | Operating: 5% to 90% R .H . (non-condensing) |
Electrical | |
Operating voltage | 24VAC (18 – 30VAC) |
Current | Maximum: 2.5A (total), 1.0A (single output) Maximum surge current: 5A |
Power supply | Dual power . Can be battery or 24VAC powered . When both the sources are available, battery will be used as back up power . |
Battery power | Battery power: AA size alkaline battery x 2 Battery life: Approximately 1 year |
Thermal | |
Outdoor & Remote temperature sensor | Maximum distance: 300 feet |
Room temperature measurement | Display range: 32° to 99°F (0° to 40°C) |
Outdoor temperature measurement | Display range: -20° to 130°F (-30° to 55°C) |
Setpoint temperature range | Heat: 40° to 90°F (4° to 32°C) Cool: 50° to 99°F (10° to 37°C) |
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.aprilairepartners.com
U.S. Patent Number 8,146,376 (and other patents pending)
© 2012 Aprilaire – A division of Research Products Corporation
Download manual: Aprilaire 8620 Programmable Thermostat Owner Guide
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