Johnson Controls C450CCN-2 Technical Bulletin

Table 7: System 450 wiring terminals and wire sizes
Terminal block type Terminal label Terminal function Wire sizes
LNC1, LNC2 Connects equipment control circuit to the
line-voltage normally closed (LNC) contact
on the SPDT relay.
LNC2 terminals are only on control and
expansion modules with two output relays.
LNO1, LNO2 Connects equipment control circuit to the
line-voltage normally open (LNO) contact on
the SPDT relay.
LNO2 terminals are only on control and
expansion modules with two output relays.
Line-voltage output
relay terminal blocks
Control and expansion
modules with relay
output
LC1, LC2 Connect line power to the line-voltage
common (LC) on the SPDT relay so that
the control module can switch line voltage
to the LNC or LNO terminals to energize
connected equipment control circuits.
LC2 terminals are only on control and
expansion modules with two output relays.
0.08 mm
2
to 2.50 mm
2
28 AWG to 14 AWG
240 VAC Left terminal is for one 240 VAC supply
power lead.
No label on the
middle terminal
Middle terminal is the common connection
for either the 120 VAC or 240 VAC supply
power lead.
Line-voltage supply
power terminal block
Power modules only
120 VAC Right terminal is for one 120 VAC supply
power lead.
0.34 mm
2
to 2.50 mm
2
22 AWG to 14 AWG
Figure 6 shows the location of and designations for the wiring terminals on a C450YNN power
module. provides descriptions, ratings, requirements, and recommended wire sizes for a C450YNN
power module.
Figure 6: C450YNN power module
Table 8: C450YNN power module
Callout Description
1 High-voltage supply power terminals
23System 450 Series C450CCU Condensing Unit Control System Technical Bulletin

Johnson Controls C450CCN-2 Specifications

General

Brand	Johnson Controls
Model	C450CCN-2
Category	Control Unit
Language	English