Typical Power Wiring Diagrams For Duct Rh And Outdoor Rh Sensors - Carrier SPS Installation Manual

Relative Humidity sensors

Typical power wiring diagrams for Duct RH and Outdoor RH sensors

DC power, 2-wire 4–20 mA current output
Power supply
-VDC+
Gnd In1 In2 In3
Controller
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.
46
RH Transmitter #1 RH Transmitter #2
VAC/ 4-20 VAC/
VDC mA VDC
AC power, 3-wire 0–10 Vdc output
4-20
mA
RH Transmitter #1
VAC/
VDC Gnd
Gnd In1 In2 In3
DC power, 3-wire 0–10 Vdc output
RH Transmitter #1
Power supply
VAC/
-VDC+
VDC
Gnd In1 In2 In3
Controller
0-10
V
Controller
Carrier Sensors
0-10
Gnd V