Eclipse ThermJet TJSR0020 Installation Manual page 18

Problem
Start-up sequence runs but burner
does not light, continued
The low fire flame is weak or unstable • Low fire adjusted too low
The burner goes off when it cycles to
high fire
The burner is erratic and does not
respond to adjustment
The burner is unstable or produces
soot or smoke
Cannot achieve full capacity
Cannot achieve efficiency
Furnace not balanced
18
Possible Cause
Not enough gas:
• Gas valve not open
Not enough gas:
• Air in the gas line
• Not enough gas
• Not enough air
• Insufficient air (flame too rich)
• Flame signal weak
• Internal damage to the burner. Some
parts inside the burner may be loose or
dirty
• The air/gas ratio is out of adjustment Measure all the gas pressures and air
• Air filter is blocked
• Gas pressure is too low into the main
gas pressure regulator
• Increased furnace/chamber pressure Re-check setup pressures.
• Poor piping practices
• Too much eductor flow
• Eductor is not adjusted properly
• Insufficient pressure to eductor
Eclipse ThermJet Self-Recuperative, V5, Installation Guide 208, 2/4/2013
Solution
Check wiring to the automatic gas
shutoff valve.
Check output from the flame safeguard
then open the gas cock and purge the
gas line.
Increase low fire gas setting.
Check gas adjustment and modify to
increase gas flow.
Check air adjustment.
Investigate any change, i.e. blocked
filter, loose connections.
Increase air supply piping.
Check air adjustment
Check air filter, clean or replace if
required
Check condition of flame monitoring
device.
Contact your Eclipse Combustion
representative or the Eclipse factory.
pressures, then compare to initial
startup settings and adjust where
necessary.
Clean or replace the air filter.
Adjust gas pressure.
Contact factory
Adjust eductor.
Re-check setup.
Check piping practices and blower
sizing.