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Trouble shooting:
There are three factors to operate the gas burner properly:
1. Electricity {(main Power 120V/60 Hz /1 Ph)( secondary 24V)}
2. Gas flow (Incoming pressure should be 10" w.c. with proper gas line without pressure drop
during burner operation).
3. Combustion air.
Check these three items properly before proceeding in detail for other problems.
Condition
1. Burner motor runs and:
No flame after pre-purge & no fuel indicator (where
applicable)
No flame, fuel indicator on (where applicable),
faulty ignition transformer or spark separately
Fenwal control defective after above tests.
2. Burner locks out after 4 seconds
Polarity reversed
Bad earth grounding
Gas pressure is too low
3. Pulsation at start
Gas pressure is too high.
Blocked Flue
4. Pulsation during operation
Burner is not correctly adjusted.
The burner is dirty.
Defective chimney
5. Burner locks out
Ionization current is too low.
6. The CO content is too high
Excess air is too high or too low.
The gas holes are clogged.
The fresh air intakes are too small.
The burner head is out of position.
7. Condensation in the heat exchanger
Firing Rate is too low.
Solutions
Check 24V feed to airflow switch & after airflow
switch to control. Fix or replace the airflow switch.
If there is no secondary power, then replace the
24Vtransformer.
Check ignition transformer, electrode, cracked
electrode or gap. Fix or replace.
Replace
First, check ionization electrode, ionization cable
(for cracks) and boot. Fix as needed.
Check power feed for broken polarity
Fix the ground wire
Check the gas pressure and adjust to proper pressure
First, check the burner head location with respect to
the end of the flame tube. Adjust as necessary.
Use manometer and readjust the pressures.
Check draft and clear flue of foreign materials.
Readjust with combustion analyzer.
Clean the burner.
Check and change if necessary with liners.
Check current. Minimum 0.8 micro amps. Check
position of ionization electrode and the condition of
the cable.
Adjust air shutter.
Clean them.
Check and readjust.
Check and readjust.
Increase the firing rate so that the stack temperature
o
is 350
F or HIGHER. Insulate the chimney.
13
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