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No.
System
High CO at low fire (con't)
8
Gas combustion noise
(rumbling)
9
Fuel-Air-Ratios are
not consistent
10
Fuel-Air-Ratios have changed
over time
11
Cannot obtain capacity
SG Manual
G. TROUBLESHOOTING (continued)
Cause
High stack draft (especially at low fire)
Poor air flow distribution (off center flame)
Diffuser not in optimum position
Fluxuating gas pressure (regulator not holding pressure)
Input too low for burner components
Improper excess air
Fluxuating gas pressure (regulator not holding pressure)
High stack draft (especially at low fire)
Diffuser not in optimum position
Poor air flow distribution (off center flame)
Linkage flexing
Linkage slip
Fuel cam screws have moved
Fuel line plugged
Fuel supply pressure changing
Combustion air temperature changed
Draft condition changed
Gas control valve - low fire stop not set (if used)
Linkage wear
Fuel cam screws have moved
Air damper seal worn
Fuel lines plugged
Fuel control valve worn
Gas orifices or gas manifold plugged
Combustion air temperature changed
Draft condition changed
Vessel plugged
Wrong spring range in regulator
Too many elbows before control valve
Gas line too small, high pressure drop
Supply pressure lower then stated
Supply pressure drops too low at high fire
Regulator too small for flow and pressure
Page 17
Correction
Stabilize draft
Adjust air straightener blade
Adjust diffuser position in or out
Check regulator pressure, sensing line
and supply pressure: sized properly
Check input, compare to rating label
Readjust excess air
Check regulator pressure and supply
Stabilize draft
Adjust diffuser position in or out
Adjust air straightener blade
Realign linkage, straighten rods
Check linkage and tighten all joints
Replace fuel cam
Check and clean lines, strainers & filters
Check and/or replace pressure regulator
Retune burner
Check draft and outlet damper
Adjust low fire stop
Check linkage and tighten all joints
Replace fuel cam
Replace air damper seals
Check and clean lines, strainers & filters
Replace fuel control valve
Clean and/or replace
Retune burner
Check draft and outlet damper
Clean vessel
Install higher spring range
Rework piping to reduce elbows
Use larger pipe size
Increase supply pressure
Use larger gas line sizes / orifice in
service regulator
Change regulator
Troubleshooting
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