GOLD CGt Gas-Fired Water Boiler — Boiler Manual
34
Part Number
550-110-290/0107
Operation — sequence
9a
Figure 28
Control module sequence of operation — status light indications
1.
Read Operating instructions
in Section
9c
. This
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.
3.
Circulator energizes.
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.
5.
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.
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.
7.
Lower
room thermostat setting (or lower tankless heater low limit
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
off cycle
.
9.
Repeat
steps
1
through
6
several times to verify operation.
10.
Return
the thermostat or tankless heater low limit to normal setting.
11. Set thermostat heat anticipator setting as instructed in
Figure 29
,
page 35.
