A.O. Smith 100 Series Service Handbook page 34

PDB - SECTION D
See Figure 21 on page 28 for location of this section on the PDB.
The upper right corner of the PDB contains the J3 Socket and the JP1 jumper. The J3 Socket is described
here. The JP1 jumper is described on page 33.
• J3 Socket (120 VAC Outputs)
• Pin 1 - 120 VAC Hot to Combustion Blower Assembly 3 Pin Socket (see Figure 4 on page 10)
• Pin 2 - 120 VAC Neutral to Combustion Blower Assembly 3 Pin Socket (see Figure 4 on page 10)
• Pin 3 - Earth Ground to Combustion Blower Assembly 3 Pin Socket (see Figure 4 on page 10)
• Pin 4 - 120 VAC Hot to MCB J1 Socket Pin 1 (see Figure 15 on page 22)
• Pin 5 - 120 VAC Neutral to MCB J1 Socket Pin 2 (see Figure 15 on page 22)
• Pin 6 - Earth Ground to MCB J1 Socket Pin 3 (see Figure 15 on page 22)
• Pin 7 - Not Used
• Pin 8 - Not Used
• Pin 9 - Not Used
• Pin 10 - Not Used
• Pin 11 - Not Used
• Pin 12 - Not Used
• Pin 13 - Not Used
• Pin 14 - Not Used
• Pin 15 - Safety Ground for BMI (Building Management Interface) option
32
D
15
12
14 11
13
J3 10
Servicing should only be performed by a Qualified Service Agent
3
9 6
8 5 2
1
7 4
115 VAC
Output
Figure 25
JP1