Echo 8870 - Manual (Page 9)

RC
RH
G
W2
C
RSC
RSA
RSB
RSR
R
REF
Y2
B-
B+
A-
BLU/WHT
ORG/WHT
BLU
GRN
ORG
BRN
BRN
GRN
BLU/WHT
ORG/WHT
BLU
ORG
BRN
GRN
BLU/WHT
ORG/WHT
BLU
ORG
BRN
GRN
BLU/WHT
ORG/WHT
BLU
ORG
RC
RH
G
W2
C
RSC
RSA
RSB
RSR
R
REF
Y2
B-
B+
A-
BLU/WHT
ORG/WHT
BLU
GRN
ORG
BRN
RC
RH
G
W2
C
RSC
RSA
RSB
RSR
R
REF
Y2
B-
B+
A-
BLU/WHT
ORG/WHT
BLU
GRN
ORG
BRN
7.5VAC
XFMR
40VA
XFRMR
ORG/WHT
BLU/WHT
RED/WHT
BLK/WHT
2-WIRE TSTAT
CABLE
ORG/WHT
ORG BLU
BLU/WHT
ORG
BLU/WHT
CAT-5
ORG/WHT
BLU
RSR
RSA
T2
T1
RSB
RSC
T3
T4
GRN
BRN
BLU
ORG
BRN
BLU
ORG
GRN
2-WIRE TST
A
T
CABLE
Model 8811 PROTOCOL ADAPTER
Model 8061 OR 8062 SUPPORT MODULE
Model 8870 THERMOSTAT
Model 8870 THERMOSTAT
Model 8870 THERMOSTAT
Model 8051
FLUSH MOUNT
SENSOR
AUTOMATION
SYSTEM
Model 8027 PLUG-IN
TRANSFORMER
Model 8818
DISTRIBUTION PANEL
RX TX
DATA
RS-232
RX TX
ENABLE
RS-485
RX TX
DATA
RS-485
POWER
Model 8811 Protocol Adapter
Power
7.5VAC RS-485 RS-485 RS-232
A+
A+
A+
CA
T
-5
CA
T -5
CA
T
-5
CA
T -5
DEH Y1
HUM W1
DEH Y1
HUM W1
DEH Y1
HUM W1
R.V.-Cool (O) R.V.-Cool (O)
R.V.-Heat (B) R.V.-Heat (B)
R.V.-Cool (O) R.V.-Cool (O)
R.V.-Heat (B) R.V.-Heat (B)
R.V.-Cool (O) R.V.-Cool (O)
R.V.-Heat (B) R.V.-Heat (B)
B+ B- REF A-
RC
A+
A-
B+
B-
R
C
A+
A-
B+
B-
R
C
A+
A-
B+
B-
R
C
A+
A-
B+
B-
A
B
A+
OFF ON
OFF ON
OFF ON
OFF ON
OFF ON
OFF ON
OFF ON
OFF ON
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
PWR
PWR
PWR
PWR
PWR
PWR
PWR
PWR
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
MAIN
PWR
ON OFF R C
24VAC
FUSE
SP
ARE FUSE
R
CA
+
A-
B+
B-
R
CA
+
A-
B+
B-
R
CA
+
A-
B+
B-
R
CA
+
A-
B+
B-
7
COMMUNICATION SYSTEM WIRING
DIAGRAM 3 shows all communication system wiring with terminations. Steps 6 through 8 provide additional
detail for each wiring step.
DIAGRAM 3 – System Communication Wiring