Aprilaire 8870 User Manual

Operating Instructions
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Aprilaire
®
Communicating Thermostat
Model 8870
CAUTION: Do not set to OFF mode during periods when
freezing temperatures could occur.
Thank you for your recent purchase of an Aprilaire
®
Communicating Thermostat. With this
purchase, you have invested in the highest quality thermostat currently available.
This Model 8870 Communicating Thermostat operates similarly to a conventional thermostat but
has the unique capability of being controlled, either locally or remotely (from a home automation
system). The Model 8870 thermostat is capable of integration into your home automation system
or independently operated with the Aprilaire Model 8825 System Controller.
Note: This manual covers basic operation of the thermostat,
which may be altered by the home automation system setup.

Aprilaire 8870 Specifications

General

Product Type	Thermostat
Display	Color touchscreen
Wi-Fi	Yes
Humidity Control	Yes
Programmable	Yes
Programmability	7-day programmable
Energy Saving Features	Energy Star Certified
Connectivity	Wi-Fi
Temperature Control	Precise temperature control
Mounting	Wall-mounted
Compatibility	Works with most HVAC systems
Power Source	Hardwired
Stages	2 Heat / 2 Cool

Summary

Getting Familiar with the Aprilaire Thermostat

Message Display

Describes display types including permanent and temporary messages for status and user information.

Control Buttons Overview

Explains the function of the Scroll/Set-Up, Mode, Adjust, Fan, and Enter buttons.

Main Display Elements

Details components and status indicators on the main display like mode, set points, fan, and temperature.

Operating the Thermostat

Select the Mode

Explains how to choose operating modes: OFF, COOL, HEAT or COOL, EM. HEAT, and HEAT.

Setting Temperatures

Details how to adjust heating and cooling setpoints using the Up/Down buttons.

Fan Operation

Describes fan control options: continuous (FAN ON) or only during heating/cooling calls.

Backlight Operation

Explains how the backlight functions, including its activation and duration.

Network Override

How to take the thermostat offline from the automation system.

Clearing Temporary Messages

How to acknowledge and clear temporary flashing messages.

Thermostat Set-Up

Accessing Set-Up Features

Instructions on how to enter the thermostat's setup menu by pressing specific buttons.

Network Override Set-Up

Enables or disables the ability to override the automation system.

Thermostat Button Lockout

Disables or limits the functionality of thermostat buttons.

Security Set-Up

Prevents unauthorized access to Thermostat Set-Up menus by setting a code.

Communications Set-Up

Configures thermostat address and optimizes communication timing.

Temperature Set-Up

Adjusts temperature differentials and display temperature offset.

Backlighting Set-Up

Controls backlight behavior, including when it turns on and its brightness.

Balance Point Set-Up

Limits heat pump operation based on outdoor temperature, requires optional module.

Display Set-Up

Configures temperature scale (°C/°F) and display options for settings and time.

In Case of Power Failure

Power Interruption Handling

Explains thermostat behavior and system operation during power outages.

Cleaning the Thermostat

Instructions for cleaning the thermostat surface with water or mild cleaner.

Warranty

Electronic Thermostat Limited Warranty

Details the five-year limited warranty for defects in materials and workmanship.