ACL CSC400 Installation And Operation Manual page 17

B ("RS485 B –" or "D1 B-")
Isolated GND (or common
GND)
Due to the potential for large amounts of noise on the Modbus communication cable, the "Isolated Ground" terminal is
connected to earth ground on the CSC400 board to improve noise immunity.
Refer to the "Modbus/RS-485 Cable Connections – Field Installations" section on page 39
or the document "CSC400_Modbus_Installation_Manual.pdf" for more details on additional
Modbus registers, programming, testing, and troubleshooting.
Ignition Module 1 and 2 Inputs & Outputs
The four terminals marked as "To Igniter 1" on the main circuit board need to be wired directly to the ACL Ignition Module if
Ignitor 1 is enabled in the menu system. The four terminals marked as "To Igniter 2" on the main circuit board need to be
wired directly to the ACL Ignition Module if Ignitor 2 is enabled in the menu system. This provides two-way communication
between the CSC400 and the ignition module(s), creating a complete combustion safety control and burner ignition system.
(See wiring diagram).
As shown in the Ignition Module Power Flow Diagram above, the "P"ower outputs to the ignition modules can be interrupted
by eleven methods (shutdowns, on/off switches, temperature relays, solid-state control relays).
Due to the fact that the two ignitors are independently controlled, a disabled ignitor does not need to have a jumper installed
between the "P" and "V" terminals to ensure that the enabled ignitor still works.
All of the below signals need to be attached between the CSC400 and Ignition Module 1 for the burner system to work
properly when Ignitor 1 is enabled. The Pilot GND signal is used to connect the ground wire attached to the Pilot assembly
ground lug to the ground of the CSC400.
"IGN 1"
Terminal
Number
58
59
60
61
62
All of the below signals need to be attached between the CSC400 and Ignition Module 2 for the burner system to work
properly when Ignitor 2 is enabled. The Pilot GND signal is used to connect the ground wire attached to the Pilot assembly
groung lug to the ground of the CSC400.
A
C
Designation Description
P Power (12VDC)
A Alarm
V Valve
GND Ground
Pilot GND Ground to Pilot
Ground lug
connection
D0 Inverting, Transceiver Terminal
0, V0 voltage (V0 > V1 for binary
0 (ON) state
Common Signal and Optional Power
Supply common ground
Ignition Module Direction
Wiring Harness
Color
Red Power output to Ignition
Module
Blue Input signal from Ignition
Module (12VDC level)
Brown Input signal from Ignition
Module (12VDC level)
Yellow Ground
N/A Ground
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