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Maintenance
1300003 (EN)
44
Ignition System Checks
Step 1:
Check igniter wire harness.
Make sure:
a. Ignition cable does not run in contact with any
metal surfaces.
b. Connections to the ignition module and to the
igniter or igniter-sensor are clean and tight.
c. Ignition cable provides good electrical
continuity.
Step 2:
Check ignition system grounding. Nuisance
shutdowns are often caused by a poor or erratic
ground.
a. A common ground is required for the module,
igniter, flame sensor and main burner.
•
Check for good metal-to-metal contact
between the igniter bracket and the main
burner.
•
Check the ground path from the GND
(Burner) terminal on the module to the
main burner. Make sure connections are
clean and tight. If the wire is damaged or
deteriorated, replace with proper wire.
Refer to
Electrical Connection
section. A
temporary leadwire connection between
the GND (BURNER) terminal and the
main burner can help confirm a ground
path problem.
•
Check the temperature at the igniter
ceramic or flame sensor insulator.
Excessive temperature permits leakage to
ground. Contact a qualified service person
if the temperature exceeds rating of igniter
or sensor.
•
If flame sensor or bracket is bent out of
position, restore to the correct position.
•
Replace the igniter and sensor or igniter-
sensor with an identical unit if the insulator
is cracked.
Step 3:
Check the flame sensing circuit.
a. Make sure the burner flame is capable of
providing a good rectification signal.
b. Make sure about 3/4 to 1 inch of the flame
sensor or igniter-sensor is continuously
immersed in the flame for the best flame
signal.
c. Check for excessive (above 1000°F [538°C])
temperature at the ceramic insulator on the
flame sensor. Excessive temperature can
cause a short to ground.
d. Check for cracked igniter-sensor or sensor
ceramic insulator, which can cause short to
ground, and replace unit if necessary.
•
Make sure electrical connections are clean
and tight. Replace damaged wire with
moisture-resistant No. 18 wire rated for
continuous duty up to 221°F (105°C).
e. If the igniter is other than a Norton 201 or
271, make sure it meets the following
specifications:
•
Igniter must reach 1832°F (1000°C) within
34 seconds with 102 VAC applied.
•
Igniter must maintain at least 500M ohm
insulation resistance between the igniter
leadwires and the igniter mounting
bracket.
•
Igniter must not develop an insulating
layer on its surface (over time) that would
prevent flame sensing.
•
Igniter surface area immersed in flame
must not exceed one-fourth of the
grounded area immersed in flame. This
would prevent flame sensing.
•
Igniter current draw at 132 VAC must not
exceed 5A.