Operation - Weil-McLain GOLD CGt Manual

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
9a
Operation — sequence
1. Read Operating instructions
information is also located on a label on the inside
of the boiler jacket door panel. Notice that either
the room thermostat or the tankless heater low limit
control can cause a call for heat.
. Raise room thermostat (or raise setting of tankless
heater low limit control) to call for heat.
Circulator energizes.
3. If limit circuit is closed, the
inducer starts. After pressure switch proves proper
airflow, control module initiates 10-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.
Figure 28 Control module sequence of operation — status light indications
34
9c During main burner operation:
in Section . This 5.
a. Control module monitors pilot flame current.
b.
6. In the event the
module closes the pilot and main gas valves, but keeps the inducer
operating for 15-second postpurge.
7. Lower
control setting) to stop call for heat. Pilot and main gas valves close
— Inducer operates for 15-second postpurge — Circulator shuts off.
8. Boiler is now in the
9. Repeat
10. Return
11. Set thermostat heat anticipator setting as instructed in
page 35.
main valve closes, spark generator activates and sequence returns
to step 4 .
If power is interrupted , control system
gas valves and restarts at step
limit control shuts down the boiler
— The circulator continues to operate.
room thermostat setting (or lower tankless heater low limit
off cycle .
through several times to verify operation.
steps 1 6
the thermostat or tankless heater low limit to normal setting.
If signal is lost
shuts off pilot and main
1 when power is restored.
— The control
Figure 29
Part Number 550-110-290/0107
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