Echo 8870 Connect The Control Wires To The Hvac/Zone System And Thermostats, Step

Step 5

CONNECT THE CONTROL WIRES TO THE HVAC/ZONE SYSTEM AND THERMOSTATS

A qualified HVAC technician should perform this step to ensure proper termination.

1.Make sure the HVAC system power is off.

2.The Thermostat Installation Instructions show wiring diagrams for several different HVAC equipment types. Use DIAGRAMS 1 & 2 as a reference only. Use color coding where possible.

DO NOT TURN ON

THE HVAC SYSTEM

POWER YET!

DIAGRAM 1 – Typical Heating / Cool Wiring Schematic

MULTI-STAGE FURNACE	USE 18-20 GA. THERMOSTAT CABLE. NUMBER OF CONDUCTORS
	REQUIRED DEPENDS ON THE HVAC SYSTEM BEING CONTROLLED

	2ND STAGE		Y2
2ND		COOL
STAGE			W2
HEAT	1ST STAGE
		COOL	Y1
	1ST
	STAGE		W1
	HEAT
FAN			G
RELAY
	24		C
	VAC		R
L2	120	L1		C	RC
	VAC			R
					RH
				RSR
MULTI-STAGE A/C				RSC	R.V.-Cool (O)
				RSB	G
	2ND			RSA
			Y2		HUM W1
	STG			REF	DEH Y1
	COOL			B-
1ST					W2
				B+
STG			Y1		Y2
COOL				A-
			C	A+
				R.V.-Heat (B)

CAUTION!	REFER TO THE THERMOSTAT INSTALLATION SHEET FOR
	INTERNAL SCHEMATIC, THERMOSTAT CHECK-OUT
ENSURE HVAC SYSTEM POWER	PROCEDURES AND OTHER HVAC WIRING DETAILS
IS OFF BEFORE WIRING

DIAGRAM 2 – Typical Heat Pump Wiring Schematic

USE 18-20 GA. THERMOSTAT CABLE. NUMBER OF CONDUCTORS REQUIRED DEPENDS ON THE HVAC SYSTEM BEING CONTROLLED

CAUTION!

ENSURE HVAC SYSTEM POWER

IS OFF BEFORE WIRING

INDOOR BLOWER/HEAT UNIT

2ND
STAGE		W2
AUX.
HEAT
	1ST
	STAGE	W1
	AUX.
FAN	HEAT
		G
RELAY
	24	C
	VAC	R

L2		L1
	120

VAC

REFER TO THE THERMOSTAT INSTALLATION SHEET FOR INTERNAL SCHEMATIC, THERMOSTAT CHECK-OUT PROCEDURES AND OTHER HVAC WIRING DETAILS

OUTDOOR HEAT PUMP UNIT

REV		1ST
VALVE		STG
HEAT	COMP.			DEFROST			SERVICE
	2ND		REV
	STG		VALVE
	COMP.		COOL
B	Y2	Y1	O		W1	C	L	R

C		RC
R
		RH
RSR
RSC	R.V.	-Cool (O)
RSB
		G
RSA
		HUM W1
REF
		DEH Y1
B-
		W2
B+
		Y2
A-

A+

R.V.-Heat (B)

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