G
G77x Intermittent Pilot Ignition Controls Technical Bulletin
3
The following definitions describe operating conditions:
•
Prepurge--Initial time delay between thermostat contact closure and
trial for ignition.
•
Trial for Ignition--Period during which the pilot valve and spark are
activated, attempting to ignite gas at the pilot burner. The control
attempts to prove flame at the pilot burner within the trial-for-ignition
time.
•
Run--Pilot and main gas valves remain energized and spark is turned
off after successful ignition.
•
Shutoff--Pilot gas did not ignite within the trial-for-ignition time. The
control de-energizes the spark circuit and pilot valve, and enters
automatic recycle period.
•
Automatic Recycle--If shutoff occurs, the control delays for a specific
recycle delay period before beginning another trial for ignition (models
with recycle only).
•
Interpurge--Period between trials for ignition when both the gas valve
and spark are deactivated to allow unburned gas to escape before the
next trial. Interpurge occurs between unsuccessful trials on a multi-trial
control or after a flameout (if the control has an interpurge).
•
Ignition Lockout--Pilot gas did not ignite within the final
trial-for-ignition time. Open thermostat contacts for 30 seconds, then
close, to restart the sequence of operation. (Models with an optional
Light-Emitting Diode (LED) will flash the LED to indicate ignition
lockout.)
•
Flameout--Loss of proven flame.
•
Hard Lockout--The control detected a fault. Open thermostat contacts
for 30 seconds, then close to restart the sequence of operation. (Models
with an optional LED will turn off the LED to indicate a hard lockout.)
Operating
Mode
Definitions
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