Operating Mode Definitions - Johnson Controls G76 Series Installation Sheets Manual

Operating
Mode
Definitions
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 main gas valve and spark
are energized in an attempt to ignite gas at the main burner. The control
attempts to prove flame at the main burner within the trial-for-ignition
time.
• Run--Main gas valve remains energized and spark is turned off after
successful ignition.
• 100% Shutoff--For controls with automatic recycle, main gas did not
ignite within the trial-for-ignition time. The control de-energizes the
spark circuit and main valve.
• Automatic Recycle--If 100% 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 loss of proven flame (flameout).
• Ignition Lockout--Main gas did not ignite within the final
trial-for-ignition time. Open the 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 the 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.)
G—G76x Direct Spark Ignition Controls Technical Bulletin 3