Henny Penny PFG-691, Technical Manual

Page: 49 / 184

Model 691
2-31
2-31. FLAME SENSOR
The flame sensor should glow a bright red when pilot is lit and
ASSEMBLY
allows gas control valve to open. If it does not sense a flame, it
shuts down the gas control valve.
Replacement 1. Remove electrical power supplied to the unit.
To avoid electrical shock or property damage, move the
power switch to OFF and disconnect main circuit
breaker, or unplug cord at wall receptacle.
2. Remove the control panel as discussed in he Complete
Control Panel-Henny Penny Section.
3. Pull the wire off the terminal of the flame sensor.
4. Using Phillips head screwdriver, remove the screw securing
the flame sensor assembly, and remove assembly from unit.
5. Replace with new assembly in reverse order. Make sure
the flame sensor has 1/4” (6.3 mm) gap between it and the
pilot hood.
2-32. IGNITOR AND FLAME
For proper function of the ignitor and flame sensor, it is
critical
SENSOR ADJUSTMENT
that they are adjusted properly. Flame rectification, from the
flame sensor to the module, must at least be 1.3 microamps.
See photos.
Ground Rod Flame Sensor Flame Sensor
1/8 in. (.32 cm)
1/4 in.
(.63 cm)
Spark Electrode Spark Electrode
If the burner assembly is removed from the fryer to install
and adjust the parts, once the assembly is re-installed, check
the spacing of the components again.
Sept. 2004