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.
2.
Raise
heater low limit control) to call for heat.
3.
Inducer and circulator energize.
switch proves proper airflow, control module
initiates 10-second prepurge.
4.
Control module sparks
valve in main gas valve.
a. If 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
flame current, spark generator is turned off and
main valve opens.
5.
During main burner operation:
a. Control module monitors pilot flame current.
Figure 28 Control module sequence of operation — status light indications
Steps
(Following step 8, cycle goes back to step 1.)
1. Standby
· Waiting for call for heat
2. Call for heat
· Circulator on
· Blower on
3. High limit circuit
· Limit controls closed
· Rollout TFE contacts closed
· Ambient temperature switch closed
4. Pressure circuit
· Pressure switch contacts closed
· Prepurge for 10 seconds
5. Pilot flame proven *
· Gas valve open
· Pilot remains on
· Boiler producing heat
6. Limit cycle
· Limit circuit open
· Gas valve closed
7. Flame outage *
· Flame out
· Boiler recycles
8. Thermostat and tankless heater
low limit satisfied
· Circulator off
· Blower postpurge
9. Circulator exercise routine
· Circulator turns on for 30 seconds
if boiler not operated for 30 days
* If pilot flame is not proven in 15 seconds, control module will flash the FLAME light, but will continue indefinitely with attempts to light the pilot burner.
The control module will not lockout on a failure to establish flame. It will lockout if line voltage polarity is reversed, stray voltage is sensed on thermostat
line, pressure switch sticks closed or fails to make within 5 minutes or if flame is sensed when it shouldn't be there. The boiler will reset after these lockouts
if any of the following occurs:
• 1 hour waiting period
34
on page 36. This
room thermostat (or raise setting of tankless
the pilot and opens pilot
light within 15 seconds, pilot
does not
light and control module senses
does
• Opening and closing of thermostat circuit
If signal is lost
activates and sequence returns to step
b.
If power is interrupted
pilot and main gas valves and restarts at step
when power is restored.
6. In the event the
— The control module closes the pilot and main
gas valves, but keeps the inducer operating for 15-
After pressure
second postpurge.
— The circulator continues to operate.
7.
Lower
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
9.
Repeat

operation.

10.
Return
normal setting.
11. Set thermostat heat anticipator setting as instructed
in
Figure 29
Call for POWER TSTAT
heat? CIRC
NO
YES
YES
YES
YES
YES
YES
NO
NO
or
• Removal of 120 VAC power for at least 45 seconds.
, main valve closes, spark generator
, control system
limit control shuts down the boiler
room thermostat setting (or lower tankless
.
off cycle
steps through several times to verify
1 6
the thermostat or tankless heater low limit to
, page 35.
LIMIT PRESS FLAME
SWITCH
= "ON" = "OFF"
Part Number 550-110-290/0501
.
4
shuts off
1
Timing
—
—
—
10 sec
15 sec
—
—
15 sec
30 sec
029007