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STEP 8
Main Flame Lights Turns On
STEP 9
Burner lights off and stays on
STEP 10 Check combustion at high
fire with VFD at 60Hz
STEP 10
Check combustion at low
fire with VFD at min. Hz
YES
NO
YES
NO
YES
NO
YES
NO
Check current at igniter. Requires 3.0
amps for proof for reliable ignition.
YES
Replace ignition control
• Adjust low fire gas pressure setting on Siemens 1 to 1 air gas actuator
• Check for gas tightness at fittings on Low Gas & High Gas connections at
actuator
• Check flame sensor for cracks in the insulator or continuity to ground
• Check for incoming gas pressure
• Adjust the air proving switch. Turn counter-clockwise to reduce sensitivity
• Adjust Min. Hertz on AC Tech VFD
Adjust inline trim valve and reseal
Adjust low fire screw on actuator
NO
Replace igniter
46
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