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Installing the RTU Open
RTU Open v3
CARRIER CORPORATION ©2019
Installation and Start-up Guide
All rights reserved
14
Channel
Number
Type
Signal
Function
Part Number
Wire and
Terminal
Numbers
Alternate
Terminals
AO - 2
AO
0-10 Vdc or
2-10 Vdc
Variable Frequency Drive
Field-supplied
J22
- 1 & 2
N/A
BO - 1
BO
N/A - Relay
Fan (G)
N/A
J1
- 4
N/A
BO - 2
BO
N/A - Relay
Heat 2 (W2) Output
N/A
J1
- 5
N/A
BO - 3
BO
N/A - Relay
Heat 1 (W1) Output
N/A
J1
- 6
N/A
BO - 4
BO
N/A - Relay
Cool 2 (Y2) Output
N/A
J1
- 7
N/A
BO - 5
BO
N/A - Relay
Cool 1 (Y1) Output
N/A
J1
- 8
N/A
BO - 6
BO
N/A - Relay
Humidi-MiZer™
N/A
J11
- 7 & 8
N/A
BO - 7
BO
N/A - Relay
Reversing Valve / High
Speed Fan / Y3
N/A
J11
- 5 & 6
N/A
BO - 8
BO
N/A - Relay
Power Exhaust
N/A
J11
- 2 & 3
N/A
Legend
AI
- Analog Input
AO
- Analog Output
BI
- Digital Input
BO
- Digital Output
*
Safety Chain Feedback
- 24 Vac required at this wire to provide
Run Enabled
status. Provide a jumper from
J1
- 1 to
J1
- 9
if no safeties are used. See
To wire inputs and outputs
(page 16) for additional information on the RTU Open wiring harness
assembly terminations.
**
Default input function
***
Parallel screw terminal at
J5
(
J5
- 1 =
J2
- 6,
J5
- 3 =
J1
- 10,
J5
- 5 =
J1
- 2) may be used in place of the associated flying
leads at the harness (Part# OPN-RTUHRN). See
To wire inputs and outputs
(page 16) for additional information.
****
Binary Input 9: Integrated Gas Control reports status and if the flame is present.
1
N.C. contact must be used as a primary safety device for approved fire shutdown operation. N.O. contact for monitoring only.
2
If a function other the default is used, do NOT connect wires from J1-x.
Input wiring specifications
Input
Maximum length
Minimum gauge
Shielding
Thermistor
1000 feet
(305 meters)
22 AWG
Unshielded
4-20 mA
3000 feet
(914 meters)
22 AWG
Unshielded
Binary input
1000 feet
(305 meters)
22 AWG
Unshielded
ZS sensors
Wireless Adapter for
wireless sensors
Equipment Touch
TruVu™ ET Display
See
Wiring devices to the RTU Open's Rnet port
(page 22).
Summary of Contents for RTU Open v3
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