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APPLICATION
THEORY OF
OPERATION
The ACL 5100 combustion safety controller is designed to ignite and prove a
continuous pilot while monitoring and annunciating multiple heater shutdowns for
all types of gas fired heaters and industrial sized burner applications.
The ACL 5100 utilizes a single ignitor/flame rod to provide both flame
acknowledgment and ignition at the pilot tip. When the ACL 5100 starts its
ignition sequence, fuel gas travels to the pilot tip where the ignitor/flame rod is
located and sparking. Once the gas is lit, the flame becomes a current path for
flame acknowledgment and the unit stops sparking. After the pilot has been
proven for 20 seconds (factory set) the ACL 5100 will allow gas to the main
burner.
If the pilot flame is extinguished, the current path is broken and the ignitor/flame
rod starts sparking within 1 second to attempt to re-light the pilot. The main is
shut off during this re-light period. If a flame is not established within the 5
second sparking period, the controller will immediately drop the output to
solenoid #1 pilot gas valve. The controller will attempt to light 2 more times with
15 seconds between each trial when equipped with three trial ignition module. If
the flame is still not lit, the flame fail alarm will be indicated by a continuous
alarm light.
If any of the shutdowns are tripped, the controller will not attempt any re-light,
and solenoid outputs will de-energize immediately. A shutdown will then be
indicated by the flashing alarm light. The shutdown must be cleared before the
controller will allow an ignition cycle.
The controller also has a power fail indicator to determine brownouts or power
disconnection and this is indicated by a flashing system on light after power has
been restored.
ACL 5100 Combustion Safety Controller
ACL 5100 Combustion Safety Controller
2
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