Maintenance
5-6
IC-SA-1511 (02/2014)
V/LNV Series Manual
5.13.1 — Solenoid Valves
A faint hum from the solenoid is normal when the coil is energized. Should the valve fail to operate, check
that there is voltage at the valve coil. If there is no voltage at the coil, check for loose wiring connections. If
there is proper voltage at the valve coil and the valve still fails to open, replace the coil. Refer to the
manufacturer’s bulletin for the correct procedure in coil replacement.
Should it become necessary to replace the complete valve, be sure that the flow is in the direction of the
arrow on the valve body.
Test for gas leaks and check valve action several times to ensure proper operation before attempting to
relight the burner.
5.13.2 — Motorized Main Gas Valves
Should the valve fail to operate, check for voltage at the valve. Make certain that the main shutoff cock is
closed prior to testing. The actuator is not field repairable nor should it be disassembled. Replace the
actuator if the valve fails to operate.
After replacement, cycle the valve with the fuel shutoff to determine that it opens and closes. If the valve
has a visual indicator, observe its position for correct operations.
5.14 — Electrical System
Because of the many types of flame safeguard systems applicable to this equipment, complete
descriptions of all burner electrical systems are beyond the scope of this manual. An individual electrical
schematic drawing is shipped with each burner and complete operation and troubleshooting instructions
are available from the various flame safeguard system manufacturers.
5.14.1 — Electric Motors
Motor supply voltage must not vary more than 10 percent from nameplate ratings. At initial startup and at
least once a year thereafter, check the motor current with a meter while the burner is in high-fire position. If
the reading exceeds the nameplate rating plus service factor, determine the cause and correct it immedi-
ately. In dusty locations, clean the motor regularly to assure adequate cooling. Lubricate in accordance
with the manufacturer's instructions.
5.15 — Checking Flame Failure
5.15.1 — Pilot Flame Failure
1.
Shut off the main fuel supply and close the gas pilot shutoff cock.
2.
The pilot ignition circuit will be energized at the end of the pre-purge period. There should be an ignition
spark, but no flame. Since there is no flame to be detected, the program relay will signal the condition.
3.
The ignition circuit will de-energize and the control will lock out on a safety shutdown and the flame
failure light will be activated.
4.
The blower will run through post-purge and stop. Turn the burner switch off and reset the safety switch.
Re-open the gas pilot shutoff cock and re-establish main fuel supply.