41
LDAP-IOM (01-22) 207733-A
Heat Exchanger Maintenance
NOTES:
• Each heat section is equipped with a TCORE
2
® heat exchanger.
• Inspection of the lower portion of the heat exchanger is done with the burner removed. Refer
to the
section for information on inspecting the lower portion of the heat
exchanger.
1 . Remove burner in accordance with
section .
2 . Remove any external dirt or dust accumulation .
3 . Visually inspect heat exchanger for cracks and holes .
4 . If crack or hole is found, replace heat exchanger .
5 . Install burner in accordance with
section .
Ignition System Maintenance
NOTE: Each heat section is equipped with a DSI control module.
•
The DSI control module (circuit board, see
) monitors the operation of the heater including ignition . The
only replaceable component is the 3-amp Type ATC or ATO fuse (color code: violet, PN 201685) . If the fuse is
blown, the problem is most likely an external overload . Correct the problem and replace the fuse .
•
Do not attempt to disassemble the control module . However, check the lead wires each heating season for insulation
deterioration and good connections .
•
For the flame sensor (see
for location), disconnect the wire and remove the screw and the flame sensor .
Clean flame sensor with an emery cloth before reinstalling .
•
Proper operation of the direct spark ignition system requires a minimum flame signal of 1 .0 microamps as measured
by a microampmeter .
⚠ WARNING ⚠
• Due to high voltage on the spark wire and electrode, do not touch when energized.
• IMPORTANT: When re-assembling, the brown ground wire must remain attached to the ignitor.
•
for location), disconnect the wire and remove the screw and ignitor . Clean the ignitor
assembly with an emery cloth before reinstalling . The spark gap (see
) must be maintained to 1/8 inch .
Figure 19. Ignitor Spark Gap
Maintenance of Fan Motor, Fan Blades, and Fan Guard
NOTE: Each heat section is equipped with a fan assembly.
Inspect and clean the motor, fan guard, and blades . Remove any dirt and grease . Take care when cleaning the fan
blades so as prevent causing misalignment or imbalance . Check to ensure that the hub of the fan blades is secure
to the shaft . If necessary, replace the assembly as follows:
1 . If heater has been installed, turn OFF gas and disconnect electric power .
2 . Remove access panel and disconnect fan motor wires, capacitor wires at capacitor, and ground screw .
3 . Remove assembled parts (fan guard, motor, and fan blade) .
4 . Disassemble and replace part(s) as needed .
