Watts AERCO SmartPlate SP23 - Page 92

SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 8 – CORRECTIVE MAINTENANCE
OMM-0069_0H • SP-100 • 1/30/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 92 of 134
STEP-DOWN TRANSFORMER REPLACEMENT Instructions
VIEW D - D
INTERIOR BACK WALL
7
TERMINAL
BLOCK TB-1
1
TEMPERATURE
CONTROLLER
L
N
G
V+
V-
1A
1B
3A
3D
OVERTEMP SWITCH
7 8 9 10 11
1 2
7 8 9 10 11
1 2
7 8 9 10 11
1 2
3
3
3
2
BOILER WATER TEMP
IN
OUT
VIEW C – C
FRONT PANEL – VIEWED FROM BACK
24 VAC
TRANSFORMER
Figure 8-30. ECS/SP Control Box Assembly 69096 (Sheet 2 of 2)