Loading ...
Loading ...
Loading ...
Part Number 550-142-302/0520
CGi
SERIES 4 — GAS-FIRED WATER BOILER — Boiler Manual
38
Operation — sequence (continued)
9a
— The circulator continues to operate.
7.
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 40.
Figure 30
STEPS
Call for
Heat?
POWER TSTAT
CIRC
LIMIT PURGE FLAME LWCO
Timing
1. Standby
• Waiting for call for heat
NO —
2. Call for heat
• Circulator on
YES —
3. Limit circuit
• Limit controls closed
• Rollout TFE contacts closed
YES
—
4. Inducer
• Inducer turns on
YES
—
5. Pressure circuit
• Pressure switch contacts closed
• Prepurge for 10 seconds
YES
35
sec
6. Flame proven *
• Gas valve open
• Ignitor remains on
• Boiler producing heat
YES
15
sec
7. Limit cycle
• Limit circuit open
• Gas valve closed
YES
—
8. Flame outage *
• Flame out
• Boiler recycles
YES
—
9. Thermostat satisfied
• Circulator off
NO
15
sec
10. Circulator exercise routine
• Circulator turns on for 30 seconds if
boiler not operated for 30 days
NO
30
sec
11. LWCO circuit
• LWCO circuit open
YES/NO —
= ON
= OFF
•
Loading ...
Loading ...
Loading ...