Carrier SPS - Typical Power Wiring Diagrams for Duct RH and Outdoor RH Sensors

Relative Humidity sensors
46 Carrier Sensors
Typical power wiring diagrams for Duct RH and Outdoor RH sensors
Power supply Power supply
Controller
Gnd In1 In2 In3
-VDC+
VAC/
VDC
4-20
mA
VAC/
VDC
4-20
mA
VAC/
VDC
0-10
V
0-10
V
Gnd
VAC/
VDC Gnd
RH Transmitter #1
RH Transmitter #1
RH Transmitter #1RH Transmitter #2
DC power, 2-wire 4–20 mA current output
Controller
Gnd In1 In2 In3
-VDC+
DC power, 3-wire 0–10 Vdc output
Controller
Gnd In1 In2 In3
AC power, 3-wire 0–10 Vdc output
CAUTION If using a 24 Vac transformer, use an isolated transformer. If sharing the transformer with your
controller or another device, be sure to connect all of the devices with the proper polarity, since most
controllers are earth grounded. Failure to do so could cause a ground loop that could damage the devices.