46
Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-21. Surge box
Part#
ͻഩϯϭϵϭϰϯͲϱϮϮ
(EK163)
Unit Part#
#121
Function
WƌŽƚĞĐƚƐƚŚĞƵŶŝƚĨƌŽŵŚŝŐŚǀŽůƚĂŐĞĂŶĚͬŽƌŚŝŐŚĞůĞĐƚƌŝĐĐƵƌƌĞŶƚĐĂƵƐĞĚďLJ
lightning.
dŚĞƌĞĂƌĞϮƚLJƉĞƐŽĨƐƵƌŐĞĂďƐŽƌďĞƌƐŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘^ƵƌŐĞĂďƐŽƌďĞƌ
A is activated by voltage higher than 220 V, the other one is activated by
voltage higher than 680 V.
Failure events
ϭ͘KƉĞŶͲĨĂŝůƵƌĞŽĨƚŚĞĂďƐŽƌďĞƌĂŶĚͬŽƌĨƵƐĞ͘
Ϯ͘^ŚŽƌƚͲĨĂŝůƵƌĞŽĨƚŚĞĂďƐŽƌďĞƌ͘
Effects on the water heater
if the surge box fails
ϭ͘hŶĂďůĞƚŽƉƌŽƚĞĐƚƚŚĞĐŽŵƉƵƚĞƌďŽĂƌĚŝĨŚŝŐŚǀŽůƚĂŐĞŐĞƚƐĂƉƉůŝĞĚƚŽƚŚĞ
unit. The computer board can short out, stopping all operations.
2. The unit cannot operate because the absorber shorted out, causing the
ĨƵƐĞƚŽďƌĞĂŬŽƉĞŶ͘
Error codes when the surge
box fails
N/A
Diagnostic
ϭ͘sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ďƵƌŶŵĂƌŬƐŽŶĐŽŵƉŽŶĞŶƚƐĂŶĚͬŽƌĐŽŶŶĞĐƚŝŽŶͬ
ďƌĞĂŬĂŐĞŽĨǁŝƌĞƐ͘
Ϯ͘ŚĞĐŬƌĞƐŝƐƚĂŶĐĞĂŶĚǀŽůƚĂŐĞ͗ƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐƐŚŽǁŶďĞůŽǁ͘
Color / Number of wires
White-Black
108 to 132 VAC
Checkpoint
A1, A2
^ƵƌŐĞĂďƐŽƌďĞƌ͗ϲϴϬs
&ƵƐĞ͗ϱ
^ƵƌŐĞĂďƐŽƌďĞƌ͗ϮϳϬs
2-3/4" (70 mm)
31/32" (25 mm)
1/2" (13.6 mm)
1-3/4" (43.2 mm)
3-3/4" (95 mm)
