Installing the RTU Open
RTU Open v3 CARRIER CORPORATION ©2019
Installation and Start-up Guide All rights reserved
20
J20 Inputs
Analog Inputs 10 and 11 are reserved for a 10k Ohm space temperature sensor with an optional 100k
Ohm offset potentiometer used for setpoint adjustment.
Wiring sensors and switches to the controller
You may wire various sensors to the RTU Open's inputs. See the table below for details.
This document gives instructions for wiring the sensors to the RTU Open. For specific mounting and wiring
instructions, see the Carrier Sensors Installation Guide or the device's Installation and Start-up Guide..
All field control wiring that connects to the RTU Open must be routed through the raceway built into the corner
post. The raceway provides the UL-required clearance between high-and low-voltage wiring.
1 Pass the control wires through the hole provided in the corner post.
2 Feed the wires through the raceway to the RTU Open.
3 Connect the wires to the removable Phoenix connectors.
4 Reconnect the connectors to the board (where removed).
For rooftop unit installation, see the base unit installation instructions.
WARNING Electrical Shock Hazard
Failure to follow this warning could cause personal injury, death, and/or equipment damage.
Disconnect all power to the unit before performing maintenance or service. Unit may automatically start if power is
not disconnected.
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