AERCO SWDW68 U-Tube Double-Wall Heaters w/ECS - Manual (Page 99)

HE-111 APPENDIX B
Rev B Mar 2013 B-3
NOTE: This drawing is only applicable for newer units built WITHOUT the voltage regulator, which are those units with a serial number of H-10-325 and ABOVE.
Figure B-1b. DW-Series Heat Exchanger Wiring Diagram (S/N H-10-325 and Above)