Weil-McLain GOLD CGI 550-110-710/0107 - Manual (Page 37)

Part Number 550-110-710/0107
3
GOLD CGi Gas-Fired Water Boiler — Boiler Manual
Operation — sequence
9a
Figure 30 Control module sequence of operation — status light indications
1. Read Operating instructions on page 40. This
information is also located on a label on the inside
of the boiler jacket door panel.
. 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 pre-
purge.
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. During main burner operation:
a. Control module monitors pilot flame current.
If signal is lost , main valve closes, spark gen-
erator 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.
6. 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.
. Lower room thermostat setting to stop call for
heat. Thermostat is satisfied — Pilot and main gas
valves are closed — Inducer operates for 15-second
postpurge — Circulator is shut off.
8. Boiler is now in the off cycle .
9. Repeat steps 1 through 6 several times to verify
operation.
10. Return the thermostat to normal setting.
11. Set thermostat heat anticipator setting as instructed
in Figure 32 , page 39.