A.O. Smith TC-099 - Manual (Page 39)

VF BOILER SERVICE MANUAL
AOS WPC - Tech Training 38 of 72 Ashland City, TN © 2007
Servicing should only be performed by a Qualified Service Agent
PDB - SECTION C
The upper right corner of the PDB contains the following:
J2 Socket (24 VAC Outputs)
• Pin 1 - 24 VAC Hot to MCB J3 Socket
• Pin 2 - 24 VAC Return to MCB J3 Socket
• Pin 3 - Ground to MCB J3 Socket
• Pin 4 - 24 VAC Hot to Stage 2 FCB - N/A on VF boilers.
• Pin 5 - 24 VAC Return to Stage 2 FCB - N/A on VF boilers.
• Pin 6 - N/A
• Pin 7 - N/A
• Pin 8 - 24 VAC Hot to Stage 3 FCB - N/A on VF boilers.
• Pin 9 - 24 VAC Return to Stage 3 FCB - N/A on VF boilers.
• Pin 10 - 24 VAC Hot to Stage 4 FCB - N/A on VF boilers.
• Pin 11 - 24 VAC Return to Stage 4 FCB - N/A on VF boilers.
• Pin 12 - N/A
J1 Socket (100VA Transformer 120 VAC x 24 VAC)
• Pin 1 - 24 VAC Common
• Pin 2 - 24 VAC Hot
• Pin 3 - 120 VAC Hot to Transformer
• Pin 4 - 24 VAC Common
• Pin 5 - 24 VAC Hot
• Pin 6 - 120 VAC Neutral to Transformer
C
3 2 1
6 5 4
9 8 7
12 11 10
J2 Pin Numbers
J2 Socket
24 VAC Outputs
J1 Socket
Transformer
1
2
3 4
5
6