Specifications

39
A. O. Smith Water Products Service Handbook
Ashland City, Tennessee 2005
©
Training Department
IGNITION CONTROL CIRCUIT BOARD CONNECTIONS
CN1 - Line Voltage
pin 1 = L1 (120 VAC)
pin 2 = Nuetral
pin 3 = GND - Green
CN17 - Combustion Blower
pin 1 = 120 VAC output - Black
pin 2 = Neutral - White
pin 3 = GND - Green
CN4 - Transformer
pin 1 = L1 (no connection necessary)
pin 2 = Neutral (no connection necessary)
pin 3 = Ground White/Black
pin 4 = 24 VAC Black/White
CN5 - 120 VAC
pin 1 = 120V Igniter - Orange
pin 2 = Ground (this is required) - Orange
CN6 - Flame Sense
pin 1 = Flame sense rod connection - Brown
CN13 - Gas Valve
pin 1 = Not used
pin 2 = Not used
pin 3 = 24 VAC to gas valve - Yellow/Blue
pin 4 = Not used
pin 5 = Not used
pin 6 = GND to gas valve (Ground) - Red/Yellow
CN15 - Gas Valve Power -
Power to next Stage ICB
pin 1 = 24 VAC - Blue/White - To ICB Gas Valve Relay Contacts
pin 2 = GND - White/Blue
CN16 - Gas Valve Power - Power from previous Stage ICB
pin 1 = 24 VAC - Blue/White - From ICB Gas Valve Relay Contacts
pin 2 = GND - White/Blue
CN11 - CCB to ICB Serial Comunications Cable
pin 1 = Not used
pin 2 = GND
pin 3 = RXD (receive lead) - Received Lead
pin 4 = TXD (transmit lead) - Transmit Lead
pin 5 = GND
pin 6 = Not used
CN12 - CCB to ICB Serial Communications
Cable
pin 1 = Not used
pin 2 = GND
pin 3 = RXD
pin 4 = TXD
pin 5 = GRD
pin 6 = Not used