Johnson Controls System 450 Series Installation Instructions

System 450™ Series Control Modules with Relay Outputs Installation Instructions 3
Table 1: System 450 Terminal Wiring Information
Label Terminal Function Wire Sizes
24V Accepts 24 VAC supply power, when a C450YNN power module is not connected,
and provides power terminal for 24 VAC (humidity) sensors.
0.08 mm
2
to 1.5 mm
2
28 AWG to 16 AWG
5V Provides 5 VDC power for active sensors.
Sn-1, Sn-2,
Sn-3
Accepts passive or active (0–5 VDC) input signals from sensors.
Note: You must position the Active/Passive Sensor Jumper (Figure 3 and
Figure 6) correctly for each sensor in your control system before operating the
system. See Setting Active/Passive Sensor Jumpers for more information.
C
(Three
Terminals)
Provide low-voltage Common connections for 24 VAC power and passive or active
sensors connected to the 5V, Sn1, Sn2, and Sn3 terminals.
Note: The three C terminals are connected internally and can be connected to
ground in the field.
LNC1, LNC2 Connects control circuit to the Normally Closed (N.C.) contact on the SPDT relay.
0.08 mm
2
to 2.5 mm
2
28 AWG to 14 AWG
LNO1, LNO2 Connects control circuit to the Normally Open (N.O.) contact on the SPDT relay.
LC1, LC2
Connects line (power) to Common (C) on the SPDT
1
relay.
1. See Internal SPDT Relay insert in Figure 2 for more System 450 relay contact and terminal information. See Technical
Specifications for SPDT relay electrical ratings.
Figure 2: C450CxN-2 Wiring Terminals
Sn2
C
Sn3
5V
24V
C
Sn1
C
Common (C) terminals
are connected
internally.
Internal
SPDT Relay
Normally Closed/Off
Position
LNC1 LNO1 LC1
Supply Power and
Control Sensor Terminals
Low Voltage (<30 V)
Dry-Contact, Line-Voltage
Relay Output Terminals
(See
for Electrical Ratings.)
Technical Specifications
6-Pin
Module
Connector
Some models have
a second output relay
and terminal block labeled
LNC2, LNO2, and LC2.
FIG:sys450_rly_cntrl_wir
Note:
not
The relay output terminals connect to an internal SPDT
relay and do supply any power to the application.

Johnson Controls System 450 Series Specifications

General

Brand	Johnson Controls
Model	System 450 Series
Category	Control Unit
Language	English