Echo 8870 Diagram 4 Thermostat Communication Wiring, Communication Terminal Definitions

Step 6

CONNECT THE COMMUNICATION AND POWER WIRES TO THE DISTRIBUTION PANEL AND THERMOSTAT

1.MAKE SURE THAT ALL SWITCHES IN THE DISTRIBUTION PANEL ARE OFF!

2.Connect the communication wires. DIAGRAM 4 shows how each thermostat is to be wired to the distribution panel.

•Use the wire colors shown in DIAGRAM 4 to help ensure proper, consistent connections.

3.Connect the REF terminal of each thermostat to the Distribution Panel REF terminals if:

•More than one transformer is used to power the thermostats in the network

•Installation is in an environment that has excessive electromagnetic interference from fluorescent lights, motors, or other EMI generating devices, such as in an industrial or office setting

DIAGRAM 4 – Thermostat Communication Wiring

							GRN/WHT
		A+ A-	B+ B-	REF			A
							B
A+	A					A	A+	ORG
A-	ON	OFF					A-	ORG/WHT
				OFF	ON
B+	B						B+	BLU
						B
B-	ON	OFF					B-	BLU/WHT
				OFF	ON
PWR							R	GRN
R						PWR
C							C	BRN
							A+

See NOTE ON REF WIRE

CAT-5

BRN	C	RC
	R
GRN		RH
	RSR
	RSC	R.V.-Cool (O)
	RSB
		G
	RSA
		HUM W1
GRN/WHT	REF
		DEH Y1
	B-
BLU/WHT		W2
	B+
BLU		Y2
	A-
ORG/WHT
ORG	A+
	R.V.-Heat (B)

COMMUNICATION TERMINAL DEFINITIONS

B+/B- RECEIVE (reference automation system) A+/A- TRANSMIT (reference automation system)

REF	GROUND REFERENCE (see Note)
R	THERMOSTAT VOLTAGE (hot)
C	THERMOSTAT VOLTAGE (common)

NOTE ON REFERENCE WIRE

Connect the REF terminals if:

•More than one transformer is used to power the thermostats in the network

•Installation is in an environment that has excessive electromagnetic interference from fluorescent lights, motors, or other EMI generating devices, such as in an industrial or office setting

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