2017_E_TYPE-HL.doc Page 48 of 55 24-Oct-2017
Note:
1. Large units also have a backup process chamber OTS controller.
2. The process chamber burner motor will run long enough to purge four times the system
volume before the oxidizer burner will fire. This will take between 1-15 minutes depending
on the unit size.
8.5 Oxidizer Burner Motor Fails To Start
The oxidizer burner motor should start. If not:
• Press the high temp safety reset
• Check the electrical power to the oxidizer burner motor.
• Check the proof of closure switch on the main gas valve.
• Did you wait for the purge delay?
• Check the purge delay relay in the electrical panel.
8.6 Oxidizer Burner Motor Starts But Flame Does Not Ignite
• Is the air proving switch-making contact? There is an On/Off indicator on the side of the
switch.
• The air proving switch is a positive/negative pressure actuated switch. Are the 1/4"
aluminum tubes installed properly?
Note: The air-proving switch supplies 120 V of electrical power to the ignition system.
Warning: The electrode and ignition transformer generate 6000 V, 20 mA of electrical
power!
• Is the electrode gapped properly at 1/8" gap? A wider or narrower gap generates a weak
spark.
• Is the electrode arcing? The electrode will only arc for 4 seconds before lockout and is
normally audible when it occurs.
8.7 Electrode Arcs But Pilot Does Not Ignite
• Is the main valve train manual valve open?
• Is the manual pilot line valve on?
• Is the pilot pipe valve on?
• Is the pilot regulator adjusting screw turned at least 3/4 of the way down. A clockwise
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