FULTON VMP40 Installation, Operation And Maintenance Manual page 52

Troubleshooting Gas-Fired Boilers
PROBLEM CAUSE
Ignition Failure 1. Power Supply
2. Ignition Electrodes
3. Transformer
4. Flame Safeguard Control
5. Faulty Air Switch
6. Gas Valve Sticking (Pilot)
7. Gas Supply
8. Loose wire connection
Flame Failure 1. Power Supply
2. Gas Supply
3. Ignition Electrodes
4. Primary Air Adjustment
5. UV Scanner Adjustment
6. Flame Safeguard Control
7. Loose wire at fuel valve circuit
8. Contact open on air
9. Scanner wiring reversed
Burner Cut-Off 1. Power Supply
2. Gas Supply
3. Ignition Electrodes
4. Air Switch
5. Gas Valve Sticking (Pilot)
6. Weak Amplifier
7. Weak Pilot
8. Faulty Liquid Level Control
9. Dirty or defective UV Scanner
safety switch
at panel box.
REMEDY
Check fuse or circuit breaker. Reset or replace, as necessary.
Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustment. Readjust if necessary.
Check for cracks in porcelain. If found,replace.
Check voltage between transformer leads at terminal block to be sure
transformer is being powered.
Check voltage between ignition terminal and neutral.
Check must be made before control locks out on safety.
If no power, replace control.
Check for bad air switch by jumpering the two air switch leads at the
terminal block. If the boiler starts and runs with these terminals
jumpered, the air switch should be replaced.
Check for dirt in valve or orifice and clean if necessary.
Check for faulty actuator or valve and replace if necessary.
Check for gas pressure and for intermittent supply problems.
Gas pressure for natural gas should be 3-1/2" W.C. plus fan pressure
at the elbow to the burner and 7" to 11" W.C. at the head of the train.
Check connections to all components.
Check fuse or circuit breaker. Reset or replace, as necessary.
Check for gas pressure and for intermittent supply problems.
Gas pressure for natural gas should be 3-1/2" W.C. plus fan pressure
at the elbow to the burner and 7" to 11" W.C. at the head of the train.
Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustment. Readjust if necessary.
Check for cracks in porcelain; if found, replace.
Check air adjustment.
Check for dirt on flame scanner and clean.
Check for proper location of detector.
Check voltage at terminal leading to main gas valve. If no power,
replace the control.
Tighten wiring connections.
Adjust to proper setting.
Change to correct terminals.
Check fuse or circuit; reset or replace, as necessary.
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.
Check electrodes for carbon buildup and clean if necessary.
Check for proper adjustment Readjust if necessary.
Check for cracks in porcelain; if found replace.
Check for bad air switch by jumpering the two air switch leads at the
terminal block. If the boiler starts and runs with these terminals
jumpered, the air switch should be replaced.
Check for dirt in valve or orifice and clean if necessary.
Check for faulty actuator or valve and replace if necessary.
Replace.
Adjust to larger pilot by adjusting pilot gas pressure regulator.
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.
Clean or replace.
Maintenance
41
VMP IOM