Fulton VMP Hot Water (VMPW) - Manual (Page 41)

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SECTION 4
VMPW-IOM-2012-1001
MAINTENANCE
4-11
Troubleshooting Gas Fired Boilers
Problem Potential Cause Potential Remedy
Poor Combustion
Refractories
Check refractories to see if they are cracked or
broken in pieces. Replace as necessary.
Not Enough Air/Build-Up on Fan
Wheel (Rich; Burner Hums)
Check CO2/O2 levels. If rich, disassemble fi lter
housing and gas train. Look inside inlet to the
fan. If there is build-up on the fan blades, clean
fan. Recheck the CO2/O2 and adjust gas valve as
necessary for all combustion points.
Fuel Valve Adjusted Too High
(Rich; Burner Hums)
Check CO2/O2 levels. Check gas pressure at
outlet of valve. If the pressure is too high, make
an adjustment at the valve. Be sure to check all
combustion points.
Too Much Air (Lean; Unstable
Flame)
Check fan discharge pressure. If too high,
adjust damper. Check CO2/O2 levels and adjust
gas valve as necessary. Be sure to check all
combustion points.
Gas Valve Adjusted Too Low
(Lean; Unstable Flame)
Check CO2 and O2 levels. Check pressure at outlet
of the valve. If too negative, adjust gas valve as
necessary.
Draft
Check draft with a gauge. Draft should be a -.02
in to -.04 in wc with burner off or -.04 in to -.06 in
when operating. May need to install a barometric
damper.
Dirty Flue
Check fl ue for carbon buildup or blockage. Clean
fl ue passages with brush.
Negative Room Pressure
Make sure no exhaust fans are running in the
boiler room.
Burner back fi res
Refractories
Check refractories to see if they are cracked or
broken in pieces. Replace as necessary.
Ignition Electrodes
Check electrodes for carbon buildup and clean if
necessary. Check for proper adjustment. Readjust
if necessary. Check for cracks in porcelain; if found
replace.
UV Scanner
Check for debris on fl ame scanner and clean as
needed. Check for proper location of detector.
Draft
Check draft with a gauge. Draft should be a -.02
in to -.04 in wc with burner off or -.04 in to -.06 in
when operating. May need to install a barometric
damper.
Negative Room Pressure
Make sure no exhaust fans are running in the
boiler room.