Weil-McLain CGS-4E 9a Operation - sequence, GOLD CGs-4E Gas-FiredWater Boiler - Boiler Manual

GOLD CGs-4E Gas-Fired Water Boiler — Boiler Manual

9a Operation — sequence

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 airflow, 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 fire for the first 60 seconds of main flame.

6.During main burner operation:

a.Control module monitors pilot flame 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.

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Part number 550-110-282/1108