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OV500 SERIES RACK OVEN - SERVICE PROCEDURES AND ADJUSTMENTS
FLAME SENSE LOCATION
1. Flame sensor is located at the bottom of the
burner assembly.
2. Flame sensor is positioned at the lower edge of
the last end shot burner.
3. Flame sensor should be parallel to the face of
the burner and horizontal to the lower edge.
FLAME SENSE CURRENT TEST
Flame sense current is rectified through the flame
from ground to sensor. A minimum flame sense
current is necessary to keep ignition system from
lockout.
1. Disconnect flame sensor wire from ignition
control module at S2 terminal.
2. Connect multi meter black lead to terminal S2
on the ignition control module and red lead to
flame sensor lead wire.
NOTE: Flame sense current can also be checked at
flame sensor wire connection.
3. Turn oven power on and set controller to call for
heat.
4. Meter reading should be a steady 1.0
microamps or higher. If not, troubleshoot flame
sense circuit.
NOTE: If reading is below 0 microamps reverse
meter leads and take another reading.
COMBUSTION ANALYSIS
1. Verify the manifold pressure as outlined under
BURNER ADJUSTMENTS.
2. Insert combustion analyzer meter 8" into air
sampling tube at 300EF. (149°C.) for
combustion tests.
DUAL POINT VENTING
F25361 (January 2010) Page 38 of 60