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240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-7. Heat exchanger
Part#
*See the table below
Unit
Part#
#401
Function
Absorbs heat from combustion and transfer it to water through the heat
exchanger pipes.
Failure events
1. Clogged heat exchanger fins and/or cracks on the heat exchanger walls.
2. Leaking exhaust gas.
3. Improper heat transfer can cause the water in heat exchanger to boil.
Effects on the water heater
if the heat exchanger fails
1. Water leakage from the heat exchanger.
2. Exhaust gas leakage (if this occurs, an overheat cutoff fuse is in place to
detect this event and immediately stop the water heater from operating)
3. Abnormal sounds during combustion .
Error codes when
the heat exchanger fails
N/A
Diagnostic
1. Visual inspection: soot deposits, cracks on the heat exchanger walls, and/
or water leakage from the heat exchanger.
2. In the event of abnormal sounds during combustion:
A. Inspect for soot buildup inside the heat exchanger.
B. Inspect for scale buildup inside the heat exchanger pipes. Scale
buildup obstructs proper heat transfer to the water, thereby
overheating the heat exchanger and causing damage.
Color / Number of wires
N/A
Checkpoint
N/A
Part #
Model
319143-525
EK198
240 Indoor (T-H3J-DV) / 340 (T-H3S-DV)
319143-526
EK199
240 Outdoor (T-H3J-OS) / 340 (T-H3S-OS)
319143-527
EK200
540 Indoor (T-H3-DV)
319143-528
EK206
540 Outdoor (T-H3-OS)
*
NOTE:
Pictures are on the following page