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Purge Cycle Feature
The CSC400 incorporates a feature that allows the user to enable a Purge Cycle when the Start button is pushed or when the
Remote Start/Stop terminal is toggled. The Purge Cycle On/Off and Purge Cycle duration time options are set through the
Configuration Menu Options (see page 32).
Inter-Purge Cycle Feature (Between Ignition Trials)
The "Int-Purge" Time feature allows the user to add additional time between each ignition trial. Purge Cycle does not have to
be enabled to use this feature.
TC3 Auxiliary High Temperature Shutdown
An option to have TC3 used as an additional auxiliary high-temperature shutdown is provided. TC2 is normally the high-
temperature shutdown thermocouple, but TC3 may be used as a backup as well by setting this option to "Yes".
Low Temperature Shutdown/Alarm
The Low Temperature Shutdown/Alarm option is provided as a method of detecting Main solenoid valve freeze-off if the fuel
gas is composed of very "wet" gas (high water content). Once the selected process temperature (TC1/2/3) rises above the
"Low Temp SD/ALM" setpoint, a flag is triggered so that an Alarm or shutdown trips if this temperature then falls below this
setting. Note that for this Low Temp Alarm or shutdown feature to trip, the measured temperature needs to fall below the Low
Temp setpoint minus the deadband used for the selected thermocouple.
For example: TC1 deadband = 2, TC3 deadband = 4, Low Temp Alarm is set to monitor both TC1 and TC3. To trip this alarm
on TC1, the TC1 temp would need to fall below (Low Temp setpoint - 2). To trip this alarm on TC3, the TC3 temp would
need to fall below (Low Temp setpoint - 4).
Dual TC1/TC2 Difference Shutdown
The Dual TC1/TC2 Difference Shutdown feature is used as a safety feature to sense an issue with a thermocouple. Both
thermocouples need to be close to each other to ensure the burner keeps operating. If the difference between TC1 and TC2
(using a dual thermocouple) is greater than 10°C, issue a shutdown because there's an issue with either thermocouple wires
melting or a short in a thermocouple at the junction point.
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