OMM-0153_E
• 5/11/2023 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 25 of 124
CENTURION Installation, Operation & Maintenance Manual
SECTION 2: INSTALLATION
2.10.1 I/O Board Connections
The I/O board contains the terminals listed below, arranged on removable, named connector
strips J3 through J7 and J14, plus Molex connectors for unit harnesses. The maximum gauge
of wires connecting to the I/O board is 14.
J24
NOTE:
To facilitate making connections these strips can be lifted off the I/O board. The entire
strip is then remounted on the I/O board after all connections have been made. If a connector
strip is removed, it must be re-mounted in its original orientation (connecting wires arranged
around the
outside
perimeter of the I/O board).
Connector Strip J3 Terminals
Pin #
Name
Description
1
2
Outside Temp +
Outside Temp -
Reserved for future use.
3
Shield
Connection to the shield from any cable.
4
5
Supply
Supply Header
–
Connection to the Supply Header temperature sensor (2 wire sensor P/N
24410C
, or 4 wire sensor P/N
61058C
) for:
•
Solar/Waste Heat application
•
Booster heat application
Typically used on Manager and Backup Manager units.
6
Remote Analog In + Connection to the Analog Remote Signal if
Operating Mode
=
Remote
Setpoint
. Used on Manager and Backup Manager units.
7
Remote Analog In
–
8
Shield
Connection to the shield from any cable.
9
PWM Input +
Reserved for future use.
10
PWM Input
–
11
BLR V.S. Pump +
Reserved for future use. Water Heater Variable Speed Pump. Connection
for the VFD signal to the pump,
12
BLR V.S. Pump
–
13
BST/WHM RS485 +
Dedicated to internal communication between units in WHM system. ACS
(legacy) panel should also be connected to this terminal.
14
RS485 Iso Gnd
15
BST/WHM RS485 -
12 V
Ground
J9
AC Hot
AC Neutral
Neutral
Ignition
Transformer
Current Sense
Line Voltage
Ignition
Transformer