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UNIT LOW VOLTAGE CONNECTIONS
NS18AT
BLUE
Page 12 of 17
C
WIRE NUTS
A
CUTOUT WITH
GROMMET
B
24V CONTROL
WIRES
24VAC Control Wiring Diagrams (Field Installed)
THERMOSTAT
5
NS18AT
BLUE
Air handler shipped with jumpers installed between W1 and W2
1
and W2 and W3.
R connection required for air conditioner with LSOM.
2
L connection wired on units with LSOM.
3
Remove jumper for 2-stage cooling.
4
Clip onboard Y1 to Y2 for 2-stage cooling.
5
NOTE - Refer to furnace, blower coil and accessory instructions for
additional wiring configurations with other optional controls.
FIGURE 14. Typical Control Wiring
HIGH VOLTAGE FIELD WIRING
FACTORY WIRING
LOW VOLTAGE (24V) FIELD WIRING
WIRE RUN LENGTH
LESS THAN 100' (30 METERS)
MORE THAN 100' (30 METERS)
A.
Run 24VAC control wires through cutout with grommet.
B.
Run 24VAC control wires through wire tie.
C.
Make 24VAC control wire connections using field-provided wire
nuts.
D.
Tighten wire tie to security 24V control wiring.
NOTE - FOR PROPER VOLTAGES, SELECT THERMOSTAT WIRE (CONTROL WIRES)
GAUGE PER TABLE ABOVE.
D
NOTE - WIRE TIE PROVIDES LOW VOLTAGE WIRE STRAIN RELIEF AND MAINTAINS
TIGHTEN
SEPARATION OF FIELD-INSTALLED LOW-AND HIGH-VOLTAGE CIRCUITS.
WIRE TIE
NOTE - DO NOT BUNDLE ANY EXCESS 24VAC CONTROL WIRES INSIDE CONTROL
BOX.
FIGURE 13
NS18AT
BLUE
THERMOSTAT
2
NS18AT
RED
3
BROWN
4
BLUE
Y2
Issue 2227
AWG# INSULATION TYPE
18
TEMPERATURE RATING
16
35ºC MINIMUM.
THERMOSTAT
5
THERMOSTAT
1
5
508277-01G / 31-5000716
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