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8
WIRING
DIAGRAM (US4040)
US4040/US4140
1
For communication wiring, use 3-con-
ductor, twisted/shielded 22 AWG.
6
GND terminal is used for self powered
4-20mA inputs and outputs.
2
Control signals may be up to nominal
28 VAC from equipment transformer.
7
4-20mA transmitter, sensor input wiring 18
AWG, twisted, shielded pair. AI1 is shown as
Self-Powered sensor. This input can be used
for either 2-wire or self powered.
3
24 VAC transformer. See powering
instructions
8
4-20 mA output 600 ohm max. Do not power
actuator with power from the thermostat. The
thermostats are half-wave rectified, whereby
the power ground is common with the signal
ground.
4
Dry contact. Must not be powered.
5
For sensor input wiring, use 2-conduc-
tor, twisted/shielded 18 AWG.
9
Unused terminal on this model.
Figure 1b
