Weil-McLain CGS-4E Boiler User Manual


  Open as PDF
of 64
 
Part number 550-110-282/1108
32
GOLD
CGs-4E Gas-Fired Water Boiler — Boiler Manual
Operation — sequence9a
1. Read appropriate Operating instructionsinSection9c.
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airow,control
module initiates a 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andsparkgeneratoristurnedoff.Controlmod-
ule initiates a 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. TheCGs-4Etimerrelaydelayshighrefortherst60seconds
of main flame.
6. During
main burner operation:
a. Controlmodulemonitorspilotame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.
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
—Induceroperatesfor15-secondpostpurge—Circulator
is shut off.
9. Boilerisnowinthe
off cycle.
10.
Repeat steps 1 through 6 several times to verify operation.
11.
Return the thermostat to normal setting.
12.Setthermostatheatanticipatorsettingto0.4amps,adjusted
for gas valve and control current.
 previous next