Weil-McLain GOLD CGI-4E - Manual (Page 38)

GOLD CGi-4E Gas-Fired Water Boiler — Boiler Manual
38
Part Number 550-110-711/1108
Operation — sequence
9a
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
and spark generator is turned off. Control module 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 CGi-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 as instructed in Figure
31 , page 40.