Echo Tools YOU will NEED…, Model 8870 Thermostat, Model 8811 Protocol Adapter

Step1

GET ALL THE COMPONENTS YOU WILL NEED

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

TOOLS YOU WILL NEED…

•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)

A+ A- B+ B- REF	A
	B

ILLUSTRATION 1 – System Components

Model 8870 Thermostat

A+ A- B+ B- R C A+ A- B+ B- R C A+ A- B+ B- R C A+ A- B+ B- R C

A

ON OFF

B

ON OFF

PWR

A

ON OFF

B

ON OFF

PWR

A

ON OFF

B

ON OFF

PWR

A

ON OFF

B

ON OFF

PWR

24VAC

C R

SPARE FUSE

FUSE

MAIN

PWR

ON OFF

	A	A+
		-
		A
OFF	ON	B+
	B
		-
		B
OFF	ON	R
	PWR
		C
	A	A+
		-
OFF	ON	A
		B+
	B
		-
OFF	ON	B
		R
	PWR
		C
	A	A+
		-
OFF	ON	A
		B+
	B
		-
OFF	ON	B
		R
	PWR
		C
	A	A+
		-
OFF	ON	A
		B+
	B
		-
OFF	ON	B
		R
	PWR
		C

RS-422 Communicating Thermostat controls single or multi-stage heat/cool or heat pump HVAC systems.

POWER RX TX		RX	TX	RX	TX
	DATA	ENABLE		DATA
	RS-485 RS-485 RS-232
Model 8811 Protocol Adapter
Power
7.5VAC	RS-485		RS-485		RS-232

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 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.

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.

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