No.
System
Cause
Correction
High CO at low fire (con’t)
High stack draft (especially at low fire)
Stabilize draft
(firing gas)
Poor air flow distribution (off center flame)
Adjust air straightener blade
Diffuser not in optimum position
Adjust diffuser position in or out
Fluxuating gas pressure (regulator not holding pressure)
Check regulator pressure, sensing line
and supply pressure: sized properly
10
Gas combustion noise
Input too low for burner components
Check input, compare to rating label
(rumbling)
Improper excess air
Readjust excess air
Fluxuating gas pressure (regulator not holding pressure)
Check regulator pressure and supply
High stack draft (especially at low fire)
Stabilize draft
Diffuser not in optimum position
Adjust diffuser position in or out
Poor air flow distribution (off center flame)
Adjust air straightner blade
11
Oil combustion smoking
Oil nozzle dirty or plugged
Clean oil nozzle
Improper excess air
Readjust excess air
Input too low for burner components
Check input, compare to rating label
High stack draft (especially at low fire)
Stabalize draft
Incorrect nozzle position
Adjust the nozzle to diffuser position
Fluxuating oil pressures (regulator not holding)
Check regulator pressure and oil supply
Poor air flow distribution (off center flame)
Adjust air straightner blade
Too much FGR (if equipped)
Reduce FGR rate
12
Fuel-Air-Ratios are
Linkage flexing
Realign linkage, straighten rods
not consistent
Linkage slip
Check linkage and tighten all joints
Fuel cam screws have moved
Replace fuel cam
Fuel line plugged
Check and clean lines, strainers & filters
Fuel supply pressure changing
Check and/or replace pressure regulator
Combustion air temperature changed
Retune burner
Draft condition changed
Check draft and outlet damper
Plugged or leaky FGR line
Clean / repair
Gas control valve - low fire stop not set
Adjust low fire stop
13
Fuel-Air-Ratios have changed Linkage wear
Check linkage and tighten all joints
over time
Fuel cam screws have moved
Replace fuel cam
Air damper seal worn
Replace air damper seals
Fuel lines plugged
Check and clean lines, strainers & filters
Fuel control valve worn
Replace fuel control valve
Gas orifices or gas manifold plugged
Clean and/or replace
Combustion air temperature changed
Retune burner
Draft condition changed
Check draft and outlet damper
Vessel plugged
Clean vessel
Plugged or leaky FGR valve
Clean / repair
14
Cannot obtain capacity on
Wrong spring range in regulator
Install higher spring range
gas
Too many elbows before control valve
Rework piping to reduce elbows
Gas line too small, high pressure drop
Use larger pipe size
Supply pressure lower then stated
Increase supply pressure
Supply pressure drops too low at high fire
Use larger gas line sizes / orifice in
service regulator
Regulator too small for flow and pressure
Change regulator
15
Cannot obtain rated input on
Oil nozzles plugged
Replace nozzles
oil firing (pressure atomized)
By-pass seal on nozzle leaking
Replace nozzles
Page 54
JBE(X) Manual
Section H - Troubleshooting
