Indoor Air Quality Wiring Diagrams; Indoor Air Quality Wiring With Separate Transformers; Indoor Air Quality Wiring With A Single Transformer; Power & Reset Options - Aprilaire 8840 Safety & Installation Instructions

INDOOR AIR QUALITY WIRING DIAGRAMS

INDOOR AIR QUALITY WIRING WITH SEPARATE TRANSFORMERS

HUM
DHnc
DH com
DH no
VNT
EAC
Note: Outputs are 24VAC dry contact . Refer to individual product installation instructions for more details .

INDOOR AIR QUALITY WIRING WITH A SINGLE TRANSFORMER

HUM
DH
nc
DH com
DH no
VNT
EAC
Note: Outputs are 24VAC dry contact . Refer to individual product installation instructions for more details .
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TRANSFORMER
HUMIDIFIER
DEHUMIDIFIER
TRANSFORMER
NORMALLY
CLOSED DAMPER
TRANSFORMER
PILOT RELAY FOR
120 VAC TO EAC
HUMIDIFIER
TRANSFORMER
DEHUMIDIFIER
NORMALLY
CLOSED DAMPER
PILOT RELAY FOR
120 VAC TO EAC
POWER & RESET OPTIONS
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 .
SETUP & TESTING

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) .
• If you have a USB drive with installer setup
files on it, insert it into the USB connector
(on the lower left corner) to import a file .
• Or press skip to proceed with the Installer
Setup Wizard .
Note: Installer setup files can be created from
the Export Setup option found under Installer
Menu > Installer Tools > Export Setup .

HVAC INSTALLER SYSTEM SETTINGS TABLES

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
Connection Type Selects if the thermostat connects with an automation
system or an Aprilaire account .
Installer Temperature Scale This selection only effects the installer setup menus .
Contractor Information Input Enter contractor's contact information .
Factory default setting
(bold) and setting range
Automation System
Aprilaire Cloud
Fahrenheit
Celsius
Company, Phone, Email, Web
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