Echo 8870 User Manual

 

Model 8870 Thermostat

RS-422 Communicating Thermostat controls single 

or multi-stage heat/cool or heat pump HVAC systems.

Model 8811 Protocol Adapter

Use to convert RS-485 communication signal from Aprilaire 

Communication System to RS-232 communication signal 

readable by host computer. Supports up to 32 thermostats.

Model 8061 and 8062 Support Modules

Up to four can be connected to a single thermostat 

to sense temperature or relative humidity at a 

location remote from the thermostat.

Model 8818 Distribution Panel

Switches in the Distribution Panel allow power or 

communications to be turned off at each individual 

thermostat to make installation and troubleshooting easy.

COMPONENTS YOU WILL NEED… (see ILLUSTRATION 1)

• One Aprilaire

®

Model 8870 Communicating Thermostat for each

zone or single zone HVAC system

• One Aprilaire Model 8818 Distribution Panel per eight (8)

thermostats in the system

• One Aprilaire Model 8811 Protocol Adapter per 32 thermostats

or one per Model 8823 system controller

• 4 to 8 conductor thermostat cable depending on equipment

stages (18 – 20 gauge)

• Category 5 communication wire (4-pair twisted cable)

• One 24V AC transformer, ungrounded (part number 8027) per

8818 Distribution Panel

• RS-232 or RS-485 based automation system such as the

Aprilaire Model 8823 System Controller

• OPTIONAL: Aprilaire Model 8061 Temperature Support Module

or Model 8062 Temperature/Humidity Support Module

• Small flat head screwdriver for terminal

screws (1/8” wide tip)

• Medium size flat/phillips head screwdriver for

component mounting screws

• Volt/ohm meter

• Computer with available com port (RS-232)

and terminal emulator such as HyperTerminal
(for system checkout)

• Wire strippers

• Small level (use to mount components level,

required for appearance only)