46
40004
4
3
TC2 temp setpoint (deg F)
Writing a value to TC2 in degrees F,
also writes to the TC2 degrees C
register (after conversion)
40050
50
49
TC3 temp setpoint (deg C)
40051
51
50
TC3 temp setpoint (deg F)
40149
149
148
TC1 temp setpoint (deg C), IGN2
Writing a value to TC1, Igniter 2 in
degrees C, also writes to the TC1, IGN2
degrees F register (after conversion)
40150
150
149
TC1 temp setpoint (deg F), IGN2
Writing a value to TC1, Igniter 2 in
degrees F, also writes to the TC1, IGN2
degrees C register (after conversion)
Additional CSC400 Feature Details
Latched versus Unlatched Shutdowns
Opening of any switch attached to the Shutdown inputs will shut off the ignition module and de-energize all six valve outputs
(Pilot, Main, TMain for IGN1 and IGN2). If the S/D Latch menu option for any shutdown is in "Unlatched S/D" mode, the
CSC400 will attempt to restart ignition (on enabled ignitors) when any switch attached to the Shutdown inputs clears. If the
S/D Latch menu option is in "Latched S/D" mode for a selected shutdown, this set of shutdown terminals will prevent the
system from automatically restarting after it detects any interruption in continuity on these input terminals. If a latched
shutdown trips, then resets itself, the CSC400 will detect this, prevent the system from automatically restarting, and alert the
user on the LED display (and via Modbus) as to which shutdown caused the latch out.
Intermittent (Pilotless) or Continuous Pilot Feature
The CSC400 incorporates a feature that allows the user to select between Pilotless/Intermittent Pilot (I) or Continuous pilot (C)
modes for burner control using the menu system. This option is set through the Configuration Menu Options (see page 32).
Intermittent / Pilotless Pilot (I)
The ACL CSC400 controller provides the Intermittent/Pilotless Pilot feature for applications where a continuous pilot may not
be desirable. The pilot output (on enabled Ignitors) is only energized when the controller is calling for heat (the measured
temperature on thermocouple 1 is below the TC1 setpoint temperature). In this case, the pilot turns on, then after 10 seconds
the Main and T/Main outputs become energized. This allows for a low fire start through the main burners or a pilot/main start
where an individual pilot and main are used. This is only initiated if the Start button has been pressed (or Modbus Start
command received) and all shutdowns and POC are closed.
Continuous Pilot (C)
When Continuous Pilot (C) is selected via the Configuration Menu option, the pilot output (on enabled Ignitors) becomes
energized when the CSC400 has been started and all shutdowns and POC are clear and permissive, regardless of whether the
controller is calling for heat.
Once the Pilot turns on, 10 seconds later the Main and T/Main solenoid outputs become energized, if calling for heat. When
the TC1 setpoint is reached, the T/Main output turns off and the Pilot and Main solenoid outputs stay energized.
