FULTON VMP40 - Page 55

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PROBLEM CAUSE REMEDY
Flame Failure 1. Power Supply Check fuse or circuit breaker. Reset or replace, as necessary.
2. Gas Supply Check for gas pressure and for intermittent supply problems.
3. 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.
4. Primary Air Adjustment Check air adjustment. Air may be blowing flame away from burner head.
5. Scanner Check for dirt on flame scanner and clean. Check for proper location
of detector.
6. Flame Safeguard Control Check voltage at terminal leading to main gas valve. If no power,
replace the control.
7. Loose wire at fuel valve circuit Tighten wiring connections.
8. Contact open on air safety switch Adjust to proper setting.
9. Scanner wiring reversed Change to correct terminals.
at panel box
Burner Cut-Off 1. Power Supply Check fuse or circuit; reset or replace, as necessary.
2. Gas Supply Check to be sure main gas cock is not closed.
Check coil in gas valve with OHM meter. Replace if faulty.
Check gas regulator setting and readjust as necessary.
Check inlet gas pressure and increase or decrease as necessary.
3. 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.
4. Scanner Check for dirt on flame scanner and clean.
Check for proper location of detector.
5. Air Switch Check for bad air switch by jumpering the two air switch leads as the
terminal block. If the boiler starts and runs with these terminals
jumpered, the air switch should be replaced.
6. Gas Valve Sticking (Pilot) Check for dirt in valve or orifice and clean if necessary.
Check for faulty actuator or valve and replace if necessary.
7. Weak Amplifier Replace.
8. Weak Pilot Adjust to larger pilot by adjusting pilot gas pressure regulator.
9. Faulty Liquid Level Control Check to see if there is power to terminal number 10 when the sight
glass shows the proper water level. If there is no power at this terminal,
the control is bad and must be replaced.
10. Dirty or defective UV Scanner Clean or replace.
Poor Combustion 1. Refractories Check refractories to see if they are plugged with soot or broken in
pieces. Clean or replace as necessary.
2. Air Adjustment Check CO
2
and O
2
levels. Adjust Gas/Air Ratio.
3. Draft Check draft with a gauge. Draft should be a -.02” to -.04” W.C. with
burner off or -.04” to -.06” when operating. May need to install a
barometric damper.
4. Dirty Flue Check flue for carbon buildup or blockage. Clean flue passages with brush.
5. Negative Room Pressure Make sure no exhaust fans are running in the boiler room.
6. Gas Servo Malset Adjust gas servo setting.
7. Air Servo Malset Adjust air servo setting.
Burner back fires 1. Refractories Check refractories to see if they are plugged with soot or broken in
pieces. Replace as necessary.
2. Ignition Electrodes Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustment. Readjust if necessary.
Check for cracks i nporcelain; if found, replace.
3. UV Scanner Check for dirt on flame scanner and clean.
Check for proper location of detector.
4. Draft Check draft with a gauge. Draft should be a -.02” to -.04” W.C. with
burner off or -.04” to -.06” when operating. May need to install a
barometric damper.
5. Negative Room Pressure Make sure no exhaust fans are running in the boiler room.
VMP IOM
Maintenance