Specifications

ManualsBrandsA.O. Smith ManualsWater Heater1850

A. O. Smith Water Products Service Handbook

Ashland City, Tennessee 2005

Training Department

IGNITION CONTROL BOARD

1 PER STAGE

Each ICB is responsible for a:

• combustion blower

• hot surface igniter

• gas valve

Each ICB will monitor:

• a gas valve

• gas valve relay

• flame sense

• igniter current

Each ICB has changeable jumpers (J24) to provide a unique communication address. Jumpers,

J26, J27, also allow the user to disable the igniter and/or blower if they are not connected to the

ICB. These jumpers also allow selection of 1 or 2 blower speed operation (not used on these

Genesis models). See Page 31.

Flame

Sensor

Hot

Surface

Ignitor

(HSI)

24 VAC

Transformer

Combustion

Blower

Line

Voltage

Gas

Valve

Board to

Board Gas

Valve

Power

To Next

Stage ICB

From

Stage ICB

(To and from

connections

are

interchangable)

J24

J26

J27

(Inside, Around Walls of Cabinet)

1 Board per stage (3 or 4)