Specifications

37
A. O. Smith Water Products Service Handbook
Ashland City, Tennessee 2005
©
Training Department
CENTRAL CONTROL CIRCUIT BOARD CONNECTIONS
CCB1000-000 Connector Pin-Out
CN1 - Boiler Inlet/Outlet Temperature probes
pins 1 & 2 = Outlet probe - Blk/Grn and Blue/Green
pins 3 & 4 = Inlet probe- Blue and Blue
CN2 - Tank temperature probe
pin 1 = Thermistor - Yellow
pin 2 = Thermistor - Yellow
CN3 - External Thermostat
pin 1 = TSTAT (low side) - Blue/Black
pin 2 = Not used
pin 3 = 24VAC to TSTAT - Black/White
CN4 - Display Board
CN5 - RS-232 Serial Communications Cable
pin 1 = CTS
pin 2 = RTS
pin 3 = RXD
pin 4 - TXD
pin 5 = GND
pin 6 = Not used
pin 7 = GND
pin 8 = 22-30 VDC
CN6 - CCB to ICB Communications - Cable
pin 1 = Not used
pin 2 = GND
pin 3 = RXD
pin 4 = TXD
pin 5 - GND
pin 6 = Not used
CN7 - Line Voltage Input
pin 1 = L2 (120 VAC) - Black
pin 2 = Neutral - White
pin 3 - Ground - Green
CN8 - Transformer
pin 1 = L1 (no connection necessary)
pin 2 = Neutral (no connection necessary)
pin 3 =
Ground - White/Black
pin 4 = 24 VAC - Black/White
CN9 & CN10 - Fuse
CCB1000-000 Connector Pin-Out
CN11 - 24 VAC Outputs
pin 1 = Alarm output - Yellow/Brown
pin 2 = Alarm ground - White/Black
pin 3 = Power vent output - Red/White
pin 4 = Power vent ground - White/Black
pin 5 = LWCO output (unswitched) - Yellow/Violet
pin 6 = LWCO ground - White/Black
pin 7 = Not used
pin 8 = Not used
CN12 - 120VAC Outputs
pin 1 = To Circulation Pump Contactor Coil - Purple
pin 2 = Not used
pin 3 = To Circulation Pump Contactor Coil - White
pin 4 = To IRI Gas Valve Contactor Coil*
pin 5 = To IRI Gas Valve Contactor Coil
pin 6 = Not used
*Industrial Risk Insurance
CN13 - Limit Switches
pin 1 = 24 VAC power to limit switches - Blk/Wht
pin 2 = From High Gas Switch 1 - White/Red
pin 3 = From High Gas Switch 2 - Yellow/Green
pin 4 = From High Gas Switch 3 - White/Violet
pin 5 = From High Gas Switch 4 - Yellow/Black
pin 6 = From Lo
w Gas Switch - Red/Green
pin 7 = From Flow Switch - White/Green
pin 8 = From LWCO Switch - White/Brown
pin 9 = From IRI Gas Valve Switch - White/Yellow
pin 10 = Ground (this is required) - Green
CN14 - Limit Switches
pin 1 = 24 VAC power to limit switches - Blk/Wht
pin 2 = 24 VDC power to high limit switch - Red
pin 3 = From High Limit Switch - Red
pin 4 = From Power Vent Switch - Yellow/Red
pin 5 = Fro Air Switch 1 - Black/Yellow
pin 6 = From Air Switch 2 - Red/Blue
pin 7 = From Air Switch 3 - Blue/Yellow
pin 8 = From Air Switch 4 - Black/Red
pin 9 = From blocked Flue Switch - Blue/Red
pin 10 = Not used
pin 11 = Not used
pin 12 = Ground (this is required) - Green
CN15 - Gas Valve Power (24 VAC)
pin 1 = 24 VAC to ICB Gas Valve Relay Contacts -
Blue/White
pin 2 = Ground (this
is required) - White/Blue
These connect to Terminal Board strips on the drop down panel - See page 17`.
Note: Solid colors are 120VAC circuits.
Stripped colors are 24VAC circuits.