Manual

14
J. Sequence of Operation, Electronic Intermittent
Ignition (EI).
1.
Normal Operation
a. Thermostat calls for heat. Vent Damper opens.
b. Ignition Module energized. Pilot Valve opens.
Igniter energized to ignite Pilot Burner.
c. Sensor proves presence of pilot ame. Main
Valve opens and ignites Main Burners.
d. Call for heat ends. Ignition Module is de-
energized. Main Valve and Pilot Valve close,
extinguishing pilot and main burners. Vent
Damper closes.
2.
Safety Shutdown
a. Limit: Automatically interrupts main burner
operation when water temperature exceeds set
point. Maximum allowable temperature is 250°F.
Circulator continues to operate with call for
heat and Vent Damper closes. Normal operation
resumes when water temperature falls below set
point.
b. Blocked Vent Switch. Automatically interrupts
main burner operation when excessive vent
system blockage occurs. Circulator continues
to operate and Vent Damper remains open with
call for heat. If blocked vent switch is activated
do not attempt to place boiler in operation. The
source of blockage must be corrected by trained
and skilled personnel from a qualied service
agency before resetting switch.
c. Flame Roll-out Switch. Automatically interrupts
boiler operation when ames or excessive heat
are present in vestibule. Circulator continues to
operate and Vent Damper remains open with call
for heat. Control is single use device. If ame
roll-out switch is activated do not attempt to
place boiler in operation. The source of blockage
must be corrected and the ame roll-out switch
replaced by trained and skilled personnel from a
qualied service agency.
d. Sensor: senses pilot ame and causes ignition
module to turn off main burner and pilot burner
gas ow should pilot burner ame extinguish.
Ignition module will try to relight pilot for
approximately 85 seconds after pilot burner
ame is extinguished. If pilot burner ame
can not be reestablished, Ignition Module will
shutdown.
Five to six minutes after shutdown, Ignition
Module automatically restarts ignition sequence.
Sequence continues until pilot burner ame
is reestablished or call for heat ends. Ignition
Module can be manually reset by adjusting
thermostat to end call for heat for one minute.
Circulator continues to operate and Vent Damper
remains open with call for heat.
For Electronic Ignition Troubleshooting Guide,
see Page 22.
Figure 13: Wiring Diagram, Electronic Intermittent Ignition (EI)