Weil-McLain CGA25SPDN Boiler User Manual


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Part Number 550-101-009/0107
37
GOLD CGa Gas-Fired Water Boiler — Boiler Manual
Figure 24 Ignition control module sequence of operation — status light indications
Operation — spark-ignited pilot boilers9a
Follow all procedures given in this manual and operating
instructions when operating the boiler. Failure to do so
could result in severe personal injury, death or substantial
property damage.
1. 3TANDBYWith no call for heat, the vent damper and circulator are de-energized.
.OGASmOWSTOPILOTORMAINGASVALVE
2.
#ALLFORHEAT(thermostat circuit closes):
A 6ENTDAMPERANDCIRCULATORENERGIZEDIFPILOTSTATUSACCEPTABLE6ENT
damper drives open. When vent damper end switch makes circuit, igni-
tion control begins pilot ignition attempt.
b. Ignition control checks for false flame signal: If ignition control senses
pilot signal when no pilot gas should be present, control will lockout,
requiring reset procedure as given in
&IGURE
3. 0ILOTIGNITION#ONTROLMODULESPARKSTHEPILOTANDOPENSPILOTVALVEINMAIN
gas valve.
a. If pilot does light and control module senses flame current, spark
generator is turned off and main valve opens.
b. If pilot does not light within 15 seconds, pilot valve is closed and
SPARKGENERATORISTURNEDOFF#ONTROLMODULEWAITSMINUTESTHEN
attempts to ignite pilot again. This cycle will continue indefinitely if
pilot ignition control does not sense pilot flame.
4. -AINBURNEROPERATION
A #ONTROLMODULEMONITORSPILOTmAME
current. If signal is lost, main valve closes,
spark generator activates and sequence
returns to step 4.
b. If power is interrupted, control system
shuts off pilot and main gas valves and
restarts at step 1 when power is restored.
c. In the event the limit control shuts down
the boiler — The control module closes
the main gas valve, but keeps the circula-
tor operating and the vent damper open.
5. 4HERMOSTATSATISlED (thermostat circuit opens)
0ILOTANDMAINGASVALVESARECLOSED6ENT
damper is de-energized, and cycles to closed posi-
TION#IRCULATORISSHUTOFF
 "OILERISNOWINTHESTANDBYMODE
7. Thermostat anticipator setting: Set thermostat
heat anticipator as instructed in
&IGUREB, page

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