THERMOSTAT INSTALLATION LOCATION RECOMMENDATIONS
The thermostat should be mounted:
Do not mount the thermostat:
Note: Installer must touch a grounded metal object before handling the equipment control module to avoid potential damage due to electrical discharge.
Equipment control module should be mounted:
Do not mount equipment control module:
The equipment control module has the following features to simplify mounting and wiring and provide for a clean and neat installation.
Installation Steps
Wire specifications:
18-24 gauge thermostat wire
Installation notes:
A remote temperature sensor can be used for control if the thermostat is to be mounted in a concealed location or a remote sensor can be averaged with the thermostat sensor to control a large space. An 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, and once enabled will override or be averaged with the thermostat’s internal temperature sensor, based on the setting.
Remote temperature sensor should be mounted:
Do not mount remote sensor:
Wire specifications:
18-24 gauge thermostat wire
Installation notes:
Outdoor temperature can be measured by installing an 8052 sensor to the ODT terminals and enabling the outdoor sensor in the installer setup menu. When an outdoor sensor is installed, the features below will be enabled.
In heat pump mode the outdoor temperature sensor can be used to efficiently utilize an air source heat pump:
Indoor Air Quality functions can use the outdoor temperature sensor to:
Outdoor temperature sensor should be mounted:
Return air temperature can be measured by attaching an 8052 sensor to the RAT terminals. The return sensor must be enabled in the installer setup menu. The return air temperature sensor provides protection in the event that the equipment control module loses connection with the thermostat. In the event that the thermostat connection is lost, the equipment control module will use the return air temperature sensor to maintain a temperature greater than 40°F and less than 100°F.
Leaving air temperature can be measured by attaching an 8052 sensor to the LAT terminals. The leaving air temperature sensor measurement is displayed during the installer test for diagnostic purposes.
IMPORTANT
Do not mount the sensor in direct line of sight of the heat exchanger, cooling coils, or UV lights as this may cause the sensor to report false temperature readings.
CONVENTIONAL HEAT/COOL SINGLE TRANSFORMER (USE JUMPER)
CONVENTIONAL HEAT/COOL TWO TRANSFORMERS (REMOVE JUMPER)
HEAT PUMP SINGLE TRANSFORMER (USE JUMPER WIRE)
HEAT PUMP TWO TRANSFORMER (REMOVE JUMPER WIRE)
INDOOR AIR QUALITY WIRING WITH SEPARATE TRANSFORMERS
Note: Outputs are 24VAC dry contact. Refer to individual product installation instructions for more details.
INDOOR AIR QUALITY WIRING WITH A SINGLE TRANSFORMER
Note: Outputs are 24VAC dry contact. Refer to individual product installation instructions for more details.
The equipment control module is powered from 24VAC. The thermostat is powered from the equipment control module. In the case of power loss the thermostat will maintain the clock for 24 hours. The thermostat has a memory backup that saves the thermostat settings in case of power interruption.
The factory reset is located in the Installer Tools option of the Installer Menu. See Installer System Settings section for details.
INSTALLER SETUP WIZARD
The first time the thermostat is powered up (or after a factory reset) it will enter the Installer Setup Wizard. All installer settings can be set in this process. The installer settings are also accessible in the MENU by pressing the Contractor Info button for 10 seconds.
Import USB settings will be the first screen that you see (the button will be grayed out until a USB drive is inserted).
The following tables contain the system settings and their details. Default settings are shown in bold. Some settings are only available dependent upon the value of other settings.
General System Settings Table
System setting | Description | Factory default setting (bold) and setting range |
Connection Type | Selects if the thermostat connects with an automation system or an Aprilaire account . | Automation System Aprilaire Cloud |
Installer Temperature Scale | This selection only effects the installer setup menus . | Fahrenheit Celsius |
Contractor Information Input | Enter contractor’s contact information . | Company, Phone, Email, Web |
Thermostat System Settings Table
System setting | Description | Factory default setting (bold) and setting range |
Equipment Type | Note: Equipment Type related settings will return to defaults if this is changed . | Heat/Cool Heat Pump |
Control Setup | Used to lockout heating or cooling outputs . (Heat/Cool mode only .) | Heat & Cool Heat Only Cool Only |
Heat Pump Auxiliary Type | Selects auxiliary type . (Heat Pump mode only .) | Gas/Oil Heat Electric Heat |
Fan Control In Heating | Selects thermostat or equipment to control the fan in heating . (Heat/Cool mode only .) | Gas/Oil Heat Electric Heat |
Number of Compressor Stages | Select number of compressor stages . (Heat Pump mode only .) | One Two |
Number of Auxiliary Heat Stages | Select number of auxiliary heat stages . (Heat Pump mode only .) | One Two |
Number of Stages of Heat | Select number of heat stages . (Heat/Cool mode only .) | One Two Three |
Number of Stages of Cool | Select number of cool stages . (Heat/Cool mode only .) | One Two Three |
Remote Temperature Sensor Installed? | Select if the remote sensor is attached, and uses backup, or is averaged with built-in . | No Yes Yes (fallback built-in) Yes (average w/built-in) |
Return Air Temperature Sensor Installed? | Select if return air temperature sensor is attached or not . | No Yes |
Outdoor Temperature Sensor Installed? | Select if outdoor sensor is attached or not . | No Yes Automation |
Display Support Modules | Select if support module values are displayed on Monitored Climate screen under Status . | No Yes |
Number of Controlling Support Modules Temp | Select number of sensors configured to be controlling temperature . | 0-8 |
Number of Controlling Support Modules RH | Select number of sensors configured to be controlling RH . | 0-4 |
Schedule | Enables or disables programmable schedule . | Enabled Disabled |
Progressive Recovery | Enables or disables progressive recovery . | Enabled Disabled |
Display Away Button? | Away allows the user to set the thermostat to a predefined setpoint using a single button press . The predefined setpoints can be selected in the User Settings . | No Yes |
Display Heat Blast Button? | Select if the Heat Blast button is displayed . | No Yes |
Blast Offset | Amount of heating when Heat Blast is initiated . | 3°F (1.5°C) 4°F (2°C) 5°F (2 .5°C) |
System setting | Description | Factory default setting (bold) and setting range |
Extended Fan – Heat | Extends fan operation after heat call ends . | Disabled Enabled |
Extended Fan – Cool | Extends fan operation after cool call ends . | Disabled Enabled |
Auto Changeover | Enable or disable Auto Changeover mode . | Disabled Enabled |
DeadBand | Auto Changeover mode deadband . | 3°F (1.5°C) 2 to 9°F (1 to 4 .5°C) |
Auto Changeover Time | Minimum time between heating and cooling calls . | 4 Minutes 1 to 5 Minutes |
Internal Temperature Sensor Offset | Field adjustment of controlling temperature sensors . | 0°F (0°C) -4 to 4°F (-2 to +2°C) |
Internal RH% Sensor Offset | Field adjustment of internal RH sensor . | 0 -5 to 5 |
Equipment Minimum On Time | Minimum on time for heating and cooling . | 2 Minutes 1 to 5 Minutes |
Heating Minimum Off Time | Minimum off time for heating . | 2 Minutes 1 to 5 Minutes |
Compressor Minimum Off Time | Minimum off time for compressor protection . | 5 Minutes 1 to 5 Minutes |
Outdoor Temperature High Balance Point | Enable or disable high balance point (Available if ODT is installed .) | Enabled Disabled |
Select High Temperature Balance Point | If outside temperature is above the high balance point the aux heat operation is not allowed . (Available if high balance point is enabled .) | 65°F (14.5°C) 0 to 80°F (-18 to 22°C) |
Outdoor Temperature Low Balance Point | Enable or disable low balance point (Available if ODT is installed .) | Enabled Disabled |
Select Low Temperature Balance Point | If outside temperature is below the low balance point the compressor operation is not allowed . (Available if low balance point is enabled .) | 20°F (-8°C) 0 to 60°F (-18 to 12°C) |
Stage Rate | Accumulation of equipment run time in staging determination . | Enabled Disabled |
Factor | 1 = more rapid staging of equipment (comfort), 5 = slower staging of equipment (economy) . | 2 1 to 5 |
First Stage Differential | First stage differential . | 1°F (0.5°C) 1 to 9°F (0 .5 to 4 .5°C) |
Second Stage Differential | Second stage differential . | 1°F (0.5°C) 1 to 9°F (0 .5 to 4 .5°C) |
Third Stage Differential | Third stage differential . | 1°F (0.5°C) 1 to 9°F (0 .5 to 4 .5°C) |
Fourth Stage Differential | Fourth stage differential . | 1°F (0.5°C) 1 to 9°F (0 .5 to 4 .5°C) |
Service HVAC Reminder | The period for displaying the “HVAC Service reminder” message . | Disabled Enabled |
Number of Months for Recurrence | Select number of months for displaying reminder . | 12 Months 1 to 12 Months |
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 an outdoor temperature sensor (recommended) enables additional Indoor Air Quality functionality.
Please refer to the Model 8840 Owner’s Manual for further information about thermostat features.
Note: Refer to manuals for humidifier, dehumidifier, air cleaner, and ventilation products for recommended installation and operation.
Humidifier System Settings Table
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 |
Display Button? | Note: Only available if Humidifier Installed is set to No . | Yes No |
Outdoor Temperature Sensor Installed? | Select if outdoor sensor is attached or not . | No Yes |
Humidifier Mode | Auto: Controls based on setting and outdoor temperature . Manual: Controls based on RH% setpoint . (Auto mode is only available if Outdoor sensor is set to Yes .) | Automatic Manual |
Allowed Humidifier Operation | Selects when humidification is allowed to occur relative to heating and fan operation . | Heat Only Heat or Fan Forces Fan |
Humidity Deadband | Select the minimum difference between the humidifier and dehumidifier setpoints . (Only available if both a humidifier and dehumidifier are installed .) | 10% 10 to 20% |
Humidifier Reminder | Selects when the “Change Water Panel” message is displayed . | Off 300h Valve 600h Valve 1 per season 2 per season |
Single or First Reminder Appears | Determines the month the first (or only) “Change Water Panel” message is displayed . | October November December January February March April May June July August September |
Second Reminder Appears | Determines the month the second “Change Water Panel” message is displayed . | October November December January February March April May June July August September |
Dehumidifier System Settings Table
System setting | Description | Factory default setting (bold) and setting range |
Dehumidifier Type Installed? | Selects if a dehumidifier is installed . (If set to None, no other dehumidifier settings will be available .) | None Whole Home Air Conditioner |
Display Button? | Note: Only available if Dehumidifier Installed is set to None . | Yes No |
Disable Dehumidification During Cooling? | Selects if a dehumidifier is disabled during a cooling call . | Yes No |
Dehumidifier Forces Fan? | Selects if dehumidification can turn on the fan . | Yes No |
Dehumidifier Overcooling Limit | Selects the amount of overcooling that can occur for dehumidification . (Only available if dehumidifier type is set to Air Conditioning .) | 1°F (0 .5°C) 2°F (1°C) 3°F (1.5°C) |
Dehumidifier Reminder | The period for displaying the “Dehumidification Service Reminder” message . | Disabled Enabled |
Number of Months for Recurrence | Select number of months for displaying reminder . | 12 Months 1 to 12 Months |
Dehumidify in Vacation Hold? | Selects if dehumidification with the air conditioner is done in vacation mode . | No Yes |
Vacation Hold Low Temperature Limit | Sets the lowest temperature the air conditioner will cool to, to meet RH setpoint in Vacation Mode . (Only available if dehumidifier type is set to Air Conditioning .) | 75°F (24°C) 70 to 85°F (21 to 29 .5°C) |
Humidity Deadband | Select the minimum difference between the humidifier and dehumidifier setpoints . (Only available if both a humidifier and dehumidifier are installed .) | 10% 10 to 20% |
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 cleaner settings will be available .) | No Yes |
Display Button? | Note: Only available if Air Cleaning Installed is set to No . | Yes No |
Air Cleaner Reminder | The period for displaying the “Change Air Filter” message . | Disabled Enabled |
Number of Months for Recurrence | Select number of months for displaying reminder . | 12 Months 1 to 12 Months |
Fresh Air System Settings Table
System setting | Description | Factory default setting (bold) and setting range |
Fresh Air Installed? | Select if ventilation is installed . (If set to No, no other ventilation settings will be available .) | No Yes |
Display Button? | Note: only available if Fresh Air Installed is set to No . | Yes No |
Fresh Air Setup Type | ASHRAE: hourly ventilation time will be calculated using the ASHRAE recommendations . Timed: hourly ventilation time will be determined based on the Fresh Air Time value . | Timed ASHRAE |
Number of Bedrooms | Selects the number of bedrooms to be used for the ASHRAE calculation . | 3 1 to 6 |
Number of Occupants | Selects the number of occupants to be used for the ASHRAE calculation . | 4 1 to 10 |
Fresh Air Time | Selects how many minutes per hour that ventilation will be active in Timed setup type . | 30m 5 to 55m |
Home Size | Selects the home size to be used for the ASHRAE calculation . | 2500 sqft 1000 to 5000 sqft |
Fresh Air CFM Delivered | Selects the ventilation CFM to be used for the ASHRAE calculation . | 60 CFM 30 to 200 CFM |
Indoor RH% High Limit | Selects if ventilation is disabled if the indoor RH exceeds the indoor RH limit . (Only available if Fresh Air Setup is set to Timed .) | Disabled Enabled |
RH% | Sets the high indoor RH limit for ventilation . (Only available if Fresh Air Setup is set to Timed .) | 60% 50 to 70% |
Outdoor Temperature Sensor Installed? | Select if outdoor sensor is attached or not . | No Yes |
Calculated Minutes Per Hour | Displays the Fresh Air Time calculated by the ASHRAE standard . | 15 to 60 Minutes |
Outdoor Temperature Low Limit | Selects if ventilation is disabled if the outdoor temperature exceeds the outdoor low limit . (Only available if an outdoor temperature sensor is installed .) | Disabled Enabled |
Temperature | Sets the low temperature limit for ventilation . (Only available if an outdoor temperature sensor is installed .) | 10°F (-12°C) -10 to 40°F (-24 to 4 .5°C) |
Outdoor Temperature High Limit | Selects if ventilation is disabled if the outdoor temperature exceeds the outdoor high limit . (Only available if an outdoor temperature sensor is installed .) | Disabled Enabled |
Temperature | Sets the high temperature limit for ventilation . (Only available if an outdoor temperature sensor is installed .) | 100°F (38°C) 90 to 105°F (32 to 40 .5°C) |
Fresh Air Forces Fan | Selects if ventilation forces fan on . | Yes No |
Fresh Air Reminder | The period for displaying the “Fresh Air Service Reminder” message . | Disabled Enabled |
Number of Months for Recurrence | Select number of months for displaying reminder . | 12 Months 1 to 12 Months |
The Installer Test can be accessed from the Installer Menu. All equipment outputs that are configured in the installer settings can be turned on and off for testing equipment. Minimum on and off times are not enforced while in this mode.
The 8840 can be connected to a Wi-Fi network either at the thermostat or another Wi-Fi device with a web browser.
HOME SCREEN
MAIN MENU
INSTALLER MENU
DISPLAY IS BLANK
If Power LED is not illuminated at the equipment control module check the following:
THE HEATING SYSTEM DOES NOT RESPOND (“HEATING” APPEARS ON SCREEN)
THE COOLING SYSTEM DOES NOT RESPOND (“COOLING” APPEARS ON SCREEN)
FAN DOES NOT TURN ON IN A CALL FOR HEAT
HEAT PUMP ISSUES COOL AIR IN HEAT MODE, OR WARM AIR IN COOL MODE
HEAT/COOL BOTH ON AT SAME TIME
HEATING EQUIPMENT IS RUNNING IN COOL MODE
“HEATING” IS NOT DISPLAYED
“COOLING” IS NOT DISPLAYED
Environment | |
Temperature (shipping) | -30° to 150°F (-34° to 65°C) |
Temperature thermostat (operating) | 32° to 120°F (0° to 48°C) |
Temperature equipment control module (operating) | 32° to 158°F (0° to 70°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 |
Control | |
Outdoor, Remote, Leaving and Return temperature sensor | Maximum distance: 300 feet |
Room temperature measurement | Display range: 32° to 99°F (0° to 40°C) |
Return and Leaving temperature measurement | Display range: -40° to 160°F (-40° to 71°C) |
Outdoor temperature measurement | Display range: -40° to 130°F (-40° 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 . |
Download Manual:
Aprilaire 8840 Automation Thermostat Installation Instruction
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Aprilaire 8840 Automation Thermostat Owner Manual
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