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1.10.2 ATO (Automatic Top-Off) Board Pin Positions and Harnesses
Connector From/To Harness #
Pin
# Function Voltage
Wire
Color
J8
RTI Add Solenoid
8074671
1 24VAC Ret
24VAC Black
2
3
ATO Pump Relay
4 24VAC Ret
24VAC Black
5
6
7
JIB Reset Switch
8 JIB Low Reset
16VDC
Black
RTI Add Solenoid
9 24VAC
24VAC Red
10
11
ATO Pump Relay
12 24VAC
24VAC Red
13
14
15
JIB Reset Switch
16 Ground
16VDC
Red
J4 (Rear) /
J5 (Front)
Transformer 8074553
1 24VAC Ret
24VAC
Orange
2 24VAC Blue
3
4
5 12VAC Ret
12VAC
Red
6 12VAC Brown
ATO 4 & 5 Battery
Jumper
8074657
7 Jumper
Ohm
Black
8 Jumper Black
J3 - Vat #3
J2 - Vat #2
J1 - Vat #1
ATO RTD
8074655 - Vat #1
8074654 - Vat #2
8074621 - Vat #3
1 DV - Probe Ground
Ohm
White
2 DV - Probe Red
3 FV - Probe Ground White
4 FV - Probe Red
J6 Orange LED 8074555
1 16VDC
16VDC
Black
2 16VDC Ret Red
J7
1
2
3 Ground
4 RB7/DATA
5 RB6/CLOCK
J10
Network Resistor
(pins 2 & 3)
or to next ATO Board (4
& 5 vat units)
8074552
1 Ground Black
2 CAN Lo Red
3 CAN Hi White
4 5VDC+ 5VDC Black
5 24VDC 24VDC Red
6 Ground White
J9 AIF J5 8074546
1 Ground Black
2 CAN Lo Red
3 CAN Hi White
4 5VDC+ 5VDC Black
5 24VDC 24VDC Red
6 Ground White