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For help with any of the steps explained in this manual that cover the installation or configuration of the
Model 8825 System Controller, please do not call your distributor. Instead, please contact Aprilaire
Technical Support, at (888) 782-8638.
1. Model 8825 System Controller
2. Power supply
3. Installation, Configuration and User Manual
4. One standard Cat5 Ethernet cable to connect the System Controller to a local area network
5. One crossover Cat5 Ethernet cable to connect the System Controller directly to a computer
network port
6. One Cat5 RS-485 serial communication pigtail cable to connect the System Controller to the
Distribution Panel
These instructions assume that you have already installed the thermostat(s) and wired them to the
Distribution Panel according to the installation instructions (Document DP 10005754).
The Distribution Panel documentation explains the installation, and further describes the process for
testing the thermostat network.
IMPORTANT NOTE: Set the ID for the thermostats to consecutive numbers beginning at 1.
IMPORTANT NOTE: If you would like to view the outside temperature on the main page and in the
histories shown by the System Controller, YOU MUST setup the outside temperature as remote sensor
#1 on thermostat #1. Refer to the installation instructions (listed below in Other Useful Documents) for
details on installing a remote temperature sensor and setting the thermostat ID.
The following documents will help you install and setup the Model 8870 Thermostat(s) and the Model
8818 Distribution Panel(s).
Installation Instructions, Model 8870 (Document #B2202660)
Installation Instructions 8061 & 8062 TT Support Module (Document #B2202777)
Communicating Thermostat System Installation Manual (Document #DP10005754)
Operating Instructions, Aprilaire Communicating Thermostat Model 8870 (Document #B2202659)
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