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240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
10-8. Secondary heat exchanger
Part#
*See the table below
Unit
Part#
#401
Function
Absorb latent heat from exhaust gas and transfer the water through the
secondary heat exchanger pipes, which can improve heat efficiency of the
unit by approximately 12%.
Failure events
1. Water leakage from the secondary heat exchanger.
2. Leaking exhaust gas.
Effects on the water heater
if the secondary heat
exchanger fails
1. Water leakage from the secondary heat exchanger.
2. Exhaust gas leakage
3. Abnormal sounds during combustion
Error codes when
the secondary heat
exchanger fails
N/A
Diagnostic
1. Visual inspection: soot deposits, cracks on the secondary heat exchanger
walls, and/or water leakage from the secondary heat exchanger.
2. In the event of abnormal sounds during combustion:
Inspect for soot buildup inside the secondary heat exchanger.
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