Fulton VMP Hot Water (VMPW) - Manual (Page 40)

© The Fulton Companies 2012
MAINTENANCE
VMPW-IOM-2012-1001
SECTION 4
4-10
Troubleshooting Gas Fired Boilers
Problem Potential Cause Potential Remedy
Burner Cut-Off / Ignition
Failure/ Flame Failure
Power Supply
Check fuse or circuit; reset or replace, as
necessary.
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.
Check for gas pressure and for intermittent
supply problems. Gas pressure for natural
gas should be 4 in to 11 in wc at the head of
the train.*
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.
Bad Air Switch
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.
Dirty or defective UV Scanner
Check for debris on fl ame scanner and clean or
replace as needed. Ensure scanner is properly
located.
Transformer
Check voltage between transformer leads at
terminal block to be sure transformer is being
powered.
Flame Safeguard Control
Check voltage between ignition terminal and
neutral. Check must be made before control locks
out on safety. If no power, replace control.
Contact open on air safety
switch
Adjust to proper setting
Loose Wire Connection Check connections to all components.
Scanner wiring reversed at panel
box
Change to correct terminals.
Protectorelay
Check voltage between pilot terminal and
ignition terminal. Check must be made before
control locks out on safety. If zero voltage, clean
relay contacts and recheck for power. If no power,
replace control.
* For natural gas fi red boilers. Refer to the test fi re sheet for all other fuels.