MAXFire
®
Series 100 Gas Igniters Manual
372001-04 Rev. C
9
Section 7 Maintenance
The following components of the MAXFire
®
igniter require periodic maintenance. Proper care of these
components ensures long and reliable service.
WARNING:
On pressurized furnace applications take precautions prior to removing the igniter to ensure
hot furnace gases do not escape from the boiler possibly creating a hazard. Forney recommends use of
aspirators on all igniters installed on pressurized furnaces.
7.1 Guide Tube
During a planned boiler outage inspect the furnace end of the guide tube for overheating. If evidence of
overheating is present, the igniter may be inserted too far forward with respect to the main burner. Refer
to the Installation section for instructions on igniter placement. If the problem persists, contact Forney for
assistance.
7.2 Igniter
The igniter internals should be removed from the guide tube every 12 months or during a scheduled boiler
outage and examined as follows.
1.
Close the manual gas shutoff valve in line with this igniter.
2.
Disconnect the gas line from the inlet to the gas tube.
3.
Disconnect the electrical cable from the HESI or HTSI.
4.
Remove the guide tube clamp from the igniter head.
5.
Inspect the HESI or HTSI electrode for any buildup of deposits. Refer to the HESI or HTSI Service
Manuals for maintenance requirements of the spark rod.
6.
Carefully remove the internal components of the igniter from the igniter guide tube. If evidence of
heat distortion is observed, the flow of cooling air to the igniter may be impaired, or the igniter may
be positioned too far forward in the burner. Make the necessary adjustments to airflow or igniter
positioning.
7.
Unscrew the orifice tube assembly from the gas tube. Examine the orifices for evidence of clogging
or accumulation of debris. Use a soft wire to clean the orifices as required.
8.
After inspecting and cleaning, reassemble the igniter, connect fuel line, electrical cables, and adjust
valves to proper positions.
