38
Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-14. Hi-limit switch
Part#
ͻഩϯϭϵϭϰϯͲϮϮϴ;DϮϭϮͿ
240 (T-H3J) /340 (T-H3S) models
ͻഩϯϭϵϭϰϯͲϬϵϱ;<EϯϰͿ
540 (T-H3) models
Unit Part#
#412
Function
ͲĂƐĞĚŽŶďŝͲŵĞƚĂůƚŚĞƌŵĂůĞdžƉĂŶƐŝŽŶ͘
ͲĞƚĞĐƚƐĞdžĐĞƐƐŝǀĞůLJŚŝŐŚǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞŝŶƉŝƉĞƐŽĨƚŚĞŚĞĂƚĞdžĐŚĂŶŐĞƌ͘
ͲĨƚĞƌĚĞƚĞĐƚŝŽŶ͕ĐŽŵŵƵŶŝĐĂƚŝŽŶďĞƚǁĞĞŶƚŚĞĐŽŵƉƵƚĞƌďŽĂƌĚĂŶĚŐĂƐ
valves are severed, shutting down the water heater instantly. The "111" or
"121" error codes will display.
Failure events
1.
hŶĂďůĞƚŽĚĞƚĞĐƚĞdžĐĞƐƐŝǀĞůLJŚŝŐŚǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞƐŝĨƐǁŝƚĐŚĨĂŝůƐΗĐůŽƐĞĚΗ͘
Ϯ͘ŽŶƚŝŶƵŽƵƐĚĞƚĞĐƚŝŽŶŽĨĞdžĐĞƐƐŝǀĞůLJŚŝŐŚǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞƐ;ƌĞŐĂƌĚůĞƐƐ
ŽĨǁŚĂƚƚŚĞĂĐƚƵĂůǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞŝƐͿŝĨƐǁŝƚĐŚĨĂŝůƐΗŽƉĞŶΗ͘
Effects on the water heater
if hi-limit switch fails
ϭ͘hŶĂďůĞƚŽƐŚƵƚĚŽǁŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌŝĨƚŚĞǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞĨƌŽŵƚŚĞ
ŚĞĂƚĞdžĐŚĂŶŐĞƌĞdžĐĞĞĚƐϭϴϱȗ&;ϴϱȗͿŽƌϭϵϰȗ&;ϵϬȗͿ͘
EŽƚĞ͗dŚĞŽƵƚůĞƚĂŶĚŚĞĂƚĞdžĐŚĂŶŐĞƌƚŚĞƌŵŝƐƚŽƌƐĂůǁĂLJƐĂĐƚĂƐďĂĐŬƵƉ
ŚŝͲůŝŵŝƚĚĞƚĞĐƚŽƌƐƚŽĚĞƚĞĐƚĞdžĐĞƐƐŝǀĞůLJŚŝŐŚǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞƐ
ŝŶƚŚĞŚĞĂƚĞdžĐŚĂŶŐĞƌ͘
Ϯ͘dŚĞǁĂƚĞƌŚĞĂƚĞƌŝƐĂůǁĂLJƐƐŚƵƚĚŽǁŶŝŵŵĞĚŝĂƚĞůLJĂĨƚĞƌƚŚĞŝŐŶŝƚŝŽŶ
process, and either the "111" or "121" error code will display.
Error codes when hi-limit
switch fails
111
121
The water heaters don't have the "141" error code that was used in our
previous models. This error code is now replaced by the "111" and the
"121" error codes.
Diagnostic
ϭ͘sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐ͘WŽƐƐŝďŝůŝƚLJĂůƐŽŝŶĐůƵĚĞƐ
ƐĐĂůĞĚĞƉŽƐŝƚƐŝŶƐŝĚĞƚŚĞŚĞĂƚĞdžĐŚĂŶŐĞƌ͘
Ϯ͘ŚĞĐŬǀŽůƚĂŐĞƐĂŶĚƌĞƐŝƐƚĂŶĐĞ͗ƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐƐŚŽǁŶďĞůŽǁ͘
Color / Number of wires
Blue-Blue
>ĞƐƐƚŚĂŶϭ͘Ϭɏ
Checkpoint
C1
When detecting temperature of the hi-limit switch exceeds the activation temperature
ĞŝƚŚĞƌϭϴϱȗ&;ϴϱȗͿŽƌϭϵϰȗ&;ϵϬȗͿ͕ƚŚĞƌĞƐĞƚďƵƚƚŽŶƚƌŝƉƐĂŶĚƐǁŝƚĐŚŐŽĞƐƚŽK&&ŵŽĚĞ͘
Deactivation: to reset switch back to ON mode, press the reset button
US-603
K
85
5/8" (15 mm)
1-1/4" (33 mm)
"85" mark
A
A
H
S
I
ϮϰϬ;dͲ,ϯ:ͿͬϯϰϬ;dͲ,ϯ^ͿŵŽĚĞůƐ
540 (T-H3) models
Reset Button
ĐƚŝǀĂƚŝŽŶƚĞŵƉ͗фϭϴϱȗ&;ϴϱȗͿ
ĐƚŝǀĂƚŝŽŶƚĞŵƉ͗фϭϵϰȗ&;ϵϬȗͿ
1-1/4" (31 mm)
1-1/4" (31 mm)
5/8" (16 mm)
Reset Button