Wiring Diagram - A.O. Smith SERIES 120 Service Handbook

WIRING DIAGRAM

BK
UPPER
PROBE/
ECO
W
LOWER
PROBE
BK - BLACK
BR - BROWN
R - RED
Y
Y - YELLOW
G - GREEN
BL - BLUE
W - WHITE
WARNING
!
Disconnect from electrical supply before servicing unit. Replace all doors and panels
before operating the water heater.
Servicing should only be performed by a Qualifi ed Service Agent
OPERATION AND SERVICE
R
BK
R
BK
Y
THERMOSTAT
R
R
IGNITION BOARD
G
Y
BLOWER PROVER
PRESSURE SWITCH
BL
BR
BK
W
R
R
W
WIRING DIAGRAM FOR BTR 500
WHEN EQUIPPED WITH WHITE-RODGERS IGNITION
BOARD, DIGITAL THERMOSTAT AND CONTROLS.
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED
MUST BE REPLACED USE ONLY TYPE 105 C
THERMOPLASTIC OR EQUIVALENT.
Figure 10
14
INDUCER
TO EARTH
GROUND
R
1a 1 1b
R
NOTE:
Must be properly grounded
IGNITER/FLAME
and have correct polarity
SENSOR
connections.
120 VAC CIRCUIT
FACTORY INSTALLED
BY INSTALLER
HOT 120 VAC
NEUTRAL
EARTH GROUND