Figure 4: Wiring the A421 Series Controls using the same power source
to power the control operation and power the controlled equipment
Table 2: A421 Control wiring terminals and wire size information
Terminal
block
Label Description, function, and requirements Wire sizes
LN Line-voltage power source (common): Connect the neutral
wire for 120 VAC supply power applications. Connect the
L1 supply power lead for all 208/240 VAC supply power
applications.
120 V Line-voltage 120 VAC control power (hot): Connect the
120 VAC supply power (hot) for 120 VAC supply power
applications (via jumper from LC in Figure 4).
TB1
120/240
VAC
Models
240 V Line-voltage 240 VAC control power (L2) terminal: Connect
the L2 supply power connection for 208/240 VAC supply
power applications through the jumper from LC. (Figure 4).
28 AWG to
12 AWG
0.08 mm² to
4.0 mm²
LC Line-voltage SPDT relay common contact: Connect power
supply to power the controlled load. Connect 120 VAC
(hot) for 120 VAC applications and L2 for 208/240 VAC
applications.
TB2
LNO Line-voltage SPDT relay normally open contact: Connects
controlled equipment to the line-voltage normally open
(LNO) contact on the SPDT relay. When LC is closed to
LNO, the relay is energized and the green LED is on. The
LNO terminal typically provides power to the controlled
equipment in cooling and heating applications.
28 AWG to
12 AWG
0.08 mm² to
4.0 mm²
7A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide
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