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CGi-4E Gas-Fired Water Boiler — Boiler Manual
38
Part Number 550-110-711/1108
Operation — sequence9a
1. Read Operating instructions on page 41. This information is
also located on a label on the inside of the boiler jacket door
panel.
2.
Raise room thermostat to call for heat.
3.
Circulator energizes. If limit circuit is closed, the inducer
starts. After pressure switch proves proper airflow, control
module initiates 30-second prepurge.
4.
Control module sparks the pilot and opens pilot valve in
main gas valve.
a. If pilot
does not light within 15 seconds, pilot valve is closed
andsparkgeneratoristurnedoff.Controlmoduleinitiatesa
15-second postpurge, then starts a new cycle.
b. If pilot
does light and control module senses flame current,
spark generator is turned off and main valve opens.
5. TheCGi-4Etimerrelaydelayshighrefortherst60seconds
of main flame.
6.
During main burner operation:
a. Controlmodulemonitorspilotamecurrent.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.
7. In the event the
limit control shuts down the boiler — The
control module closes the pilot and main gas valves, but keeps
the inducer operating for 15-second postpurge.
— The circulator continues to operate.
8.
Lower room thermostat setting to stop call for heat. Ther-
mostat is satisfied — Pilot and main gas valves are closed
—Induceroperatesfor15-secondpostpurge—Circulator
is shut off.
9. Boilerisnowinthe
off cycle.
10.
Repeat steps 1 through 6 several times to verify operation.
11.
Return the thermostat to normal setting.
12.Setthermostatheatanticipatorsettingasinstructedin
Figure
31
, page 40.