Surge Box - A.O. Smith 240 T-H3J Service Manual

10-21. Surge box

Part#
Function
Failure events
Effects on the water heater
if the surge box fails
Error codes when the surge
box fails
Diagnostic
Color / Number of wires
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
(EK163)
lightning.
A is activated by voltage higher than 220 V, the other one is activated by
voltage higher than 680 V.
unit. The computer board can short out, stopping all operations.
2. The unit cannot operate because the absorber shorted out, causing the
White-Black 108 to 132 VAC
46
Page
CONFIDENTIAL
Unit Part#
N/A
Checkpoint
3-3/4" (95 mm)
2-3/4" (70 mm)
Ver. 1.00
#121
A1, A2