RTU Open
Installation and Start-up Guide
CARRIER CORPORATION ©2010
A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No. 11-808-427-01 · 11/19/2010
Table of Contents |
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Introduction.................................................................................................................................................................. |
1 |
What is the RTU Open controller? ...................................................................................................................... |
1 |
Specifications ........................................................................................................................................................ |
3 |
Safety considerations........................................................................................................................................... |
4 |
Installation ................................................................................................................................................................... |
5 |
Field-supplied hardware ...................................................................................................................................... |
5 |
To mount the RTU Open....................................................................................................................................... |
6 |
To wire the controller for power.......................................................................................................................... |
7 |
Using the rooftop equipment control power transformer ................................................................... |
7 |
Using an auxiliary control power transformer...................................................................................... |
8 |
To set the RTU Open's address........................................................................................................................... |
9 |
To set the RTU Open's communications protocol and baud rate............................................................... |
10 |
Wiring the RTU Open to the MS/TP network................................................................................................. |
10 |
Wiring specifications ........................................................................................................................... |
11 |
To wire the controller to the network ................................................................................................. |
11 |
Wiring inputs and outputs ................................................................................................................................ |
12 |
Input wiring specifications .................................................................................................................. |
13 |
Inputs ................................................................................................................................................... |
13 |
Binary outputs ..................................................................................................................................... |
14 |
Analog output ...................................................................................................................................... |
14 |
To wire inputs and outputs ................................................................................................................. |
14 |
Wiring sensors to inputs ................................................................................................................................... |
18 |
Field-supplied sensor hardware ......................................................................................................... |
19 |
Wiring an SPT sensor .......................................................................................................................... |
20 |
Rnet wiring specifications........................................................................................................ |
20 |
To wire the SPT sensor to the controller ................................................................................. |
21 |
Wiring a Supply Air Temperature sensor............................................................................................ |
21 |
Wiring specifications ................................................................................................................ |
22 |
To wire the SAT sensor to the controller ................................................................................. |
22 |
Wiring a Duct Air Temperature sensor ............................................................................................... |
22 |
Wiring specifications ................................................................................................................ |
22 |
To wire a duct sensor to the controller ................................................................................... |
23 |
Wiring an Outdoor Air Temperature sensor ....................................................................................... |
23 |
Wiring specifications ................................................................................................................ |
23 |
To wire an OAT sensor to the controller .................................................................................. |
23 |
Wiring a CO2 sensor............................................................................................................................ |
24 |
Wiring specifications ................................................................................................................ |
24 |
To wire the CO2 sensor to the controller ................................................................................ |
24 |
Wiring an Outdoor Air Quality sensor ................................................................................................. |
25 |
Wiring specifications ................................................................................................................ |
26 |
To wire the OAQ sensor to the controller ................................................................................ |
26 |
Wiring a Relative Humidity sensor ..................................................................................................... |
26 |
Wiring specifications ................................................................................................................ |
27 |
To wire the RH sensor to the controller................................................................................... |
27 |
Wiring a Humidistat............................................................................................................................. |
27 |
Wiring specifications ................................................................................................................ |
27 |
To wire a humidistat to the controller ..................................................................................... |
28 |
Wiring an enthalpy switch................................................................................................................... |
28 |
Wiring specifications ................................................................................................................ |
28 |
To wire an enthalpy switch (outdoor air) to the controller ..................................................... |
29 |
To wire an enthalpy switch (differential) to the controller...................................................... |
30 |
RTU Open |
i |
Table of Contents |
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Wiring a status switch......................................................................................................................... |
31 |
Wiring specifications ................................................................................................................ |
31 |
To wire a status switch to the controller ................................................................................. |
32 |
Wiring a compressor safety ................................................................................................................ |
32 |
Wiring specifications ................................................................................................................ |
32 |
To wire a compressor safety input to the controller............................................................... |
33 |
Wiring an occupancy switch or door contact ..................................................................................... |
33 |
Wiring specifications ................................................................................................................ |
33 |
To wire an occupancy switch or door contact......................................................................... |
34 |
Start-up....................................................................................................................................................................... |
35 |
Service Test......................................................................................................................................................... |
36 |
Configuring the RTU Open's properties .......................................................................................................... |
37 |
Unit Configuration properties ............................................................................................................. |
37 |
Setpoint properties.............................................................................................................................. |
39 |
Service Configuration properties........................................................................................................ |
40 |
Sequence of Operation ............................................................................................................................................. |
42 |
Occupancy........................................................................................................................................................... |
42 |
Supply fan ........................................................................................................................................................... |
43 |
Cooling................................................................................................................................................................. |
43 |
Economizer ......................................................................................................................................................... |
44 |
Power Exhaust.................................................................................................................................................... |
44 |
Unoccupied Free Cooling .................................................................................................................................. |
45 |
Optimal Start ...................................................................................................................................................... |
45 |
Enthalpy control ................................................................................................................................................. |
46 |
Indoor Air CO2 .................................................................................................................................................... |
46 |
Heating ................................................................................................................................................................ |
47 |
Heat Pump operation........................................................................................................................................ |
48 |
Dehumidification ............................................................................................................................................... |
48 |
Demand Limit..................................................................................................................................................... |
49 |
Door switch ......................................................................................................................................................... |
49 |
Remote occupancy............................................................................................................................................ |
49 |
Fire Shutdown .................................................................................................................................................... |
49 |
Compressor Safety ............................................................................................................................................ |
49 |
Fan Status........................................................................................................................................................... |
50 |
Filter Status ........................................................................................................................................................ |
50 |
Alarms ................................................................................................................................................................. |
50 |
Linkage................................................................................................................................................................ |
53 |
Linkage Air Source Modes................................................................................................................................ |
54 |
Troubleshooting ......................................................................................................................................................... |
55 |
Serial number..................................................................................................................................................... |
55 |
LED's .................................................................................................................................................................... |
55 |
Replacing the RTU Open's battery .................................................................................................................. |
56 |
Compliance ................................................................................................................................................................ |
57 |
FCC Compliance................................................................................................................................................. |
57 |
CE Compliance ................................................................................................................................................... |
57 |
BACnet Compliance........................................................................................................................................... |
57 |
Appendix A: RTU Open Points/Properties .............................................................................................................. |
58 |
Status................................................................................................................................................................... |
58 |
Unit Configuration.............................................................................................................................................. |
59 |
Setpoints ............................................................................................................................................................. |
61 |
Alarm Configuration .......................................................................................................................................... |
65 |
Service Configuration........................................................................................................................................ |
66 |
Maintenance....................................................................................................................................................... |
68 |
Alarms ................................................................................................................................................................. |
70 |
ii |
RTU Open |
|
Table of Contents |
Linkage................................................................................................................................................................ |
71 |
I/O Points............................................................................................................................................................ |
71 |
Appendix B: Single Point Linkage and Device Address Binding ............................................................................ |
73 |
Single Point Linkage ......................................................................................................................................... |
73 |
Device Address Binding .................................................................................................................................... |
74 |
Index ........................................................................................................................................................................... |
75 |
RTU Open |
iii |
The RTU Open controller is available as an integrated component of a Carrier rooftop unit, or as a fieldinstalled retrofit product. Its internal application programming provides optimum rooftop performance and energy efficiency. RTU Open enables the unit to run in 100% stand-alone control mode or it can communicate to the Building Automation System (BAS).
On board DIP switches allow you to select the baud rate and choose one of the following protocols:
•BACnet
•Modbus
•Johnson N2
•LonWorks
Carrier’s diagnostic display tools such as BACview6 Handheld or Virtual BACview can be used with the RTU Open controller via the J12 Access Port. See illustration on the following page.
RTU Open |
1 |
Introduction
2 |
RTU Open |
RTU Open driver |
drv_rtuopn_std |
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Power |
24 Vac ±10%, 50–60 Hz |
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20 VA power consumption (26 VA with BACview attached) |
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26 Vdc (25 V min, 30 V max) |
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Single Class 2 source only, 100 VA or less |
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Access port J12 |
To connect a BACview6 Handheld, Virtual BACview, or Field Assistant |
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Rnet port J13 |
For SPT sensors and a BACview6 in any of the following combinations, wired |
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in a daisy-chain configuration: |
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• 1 SPT Plus or SPT Pro |
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• 1–4 SPT Standards |
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• 1–4 SPT Standards, and 1 SPT Plus or SPT Pro |
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Any of the above combinations, plus a BACview6, but no more than 6 devices |
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total |
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Comm Option port |
For communication with the LonWorks Option Card. |
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Inputs |
12 inputs: |
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Inputs 1 - 2: |
4-20 mA only |
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Inputs 3, 5, 8, 9: |
Binary, 24 Vac |
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Inputs 6 - 7: |
Thermistor |
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Inputs 10 - 11: |
Thermistor |
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Rnet sensor |
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Binary outputs |
8 relay outputs, contacts rated at 3 A max @ 24 Vac |
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Configured normally open. |
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Analog output |
1 analog output |
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AO1: 2 - 10 Vdc or 4-20 mA |
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Output resolution |
10 bit D/A |
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Real-time clock |
Battery-backed real-time clock keeps track of time in event of power failure |
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Battery |
10-year Lithium CR2032 battery provides a minimum of 10,000 hours of |
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data retention during power outages |
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Protection |
Incoming power and network connections are protected by non-replaceable |
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internal solid-state polyswitches that reset themselves when the condition |
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that causes a fault returns to normal. The power, network, and output |
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connections are also protected against voltage transient and surge events. |
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Status indicators |
LED's indicate status of communications, running, errors, power, and digital |
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outputs |
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Environmental operating |
-40 to 158°F (-40 to 70°C), 10–95% relative humidity, non-condensing |
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range |
NOTE Controllers should be mounted in a protective enclosure. |
Vibration during operation: all planes/directions, 1.5G @ 20–300 Hz
Shock during operation: all planes/directions, 5G peak, 11 ms
Shock during storage: all planes/directions, 100G peak, 11 ms
RTU Open |
3 |
Introduction
Overall dimensions |
A: |
6-1/2 in. (16.5 cm) |
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B: |
6-1/2 in. (16.5 cm) |
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Mounting dimensions |
7 mounting holes in various positions |
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Panel depth |
2-1/2 in. (6.4 cm) |
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Weight |
11.2 oz (0.32 kg) |
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BACnet support |
Conforms to the Advanced Application Controller (B-AAC) Standard Device |
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Profile as defined in ANSI/ASHRAE Standard 135-2004 (BACnet) Annex L |
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Listed by |
UL-873, FCC Part 15-Subpart B-Class A, CE EN50082-1997 |
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Disconnect electrical power to the RTU Open before wiring it. Failure to follow this warning could cause electrical shock, personal injury, or damage to the controller.
4 |
RTU Open |
To install the RTU Open:
1Mount the controller (page 6).
2Wire the controller for power (page 7).
○Using the rooftop equipment control power transformer (page 7).
○Using an auxiliary control power transformer (page 8).
3Set the controller's address (page 9).
4Wire inputs and outputs (page 12).
5Wire sensors to the controller (page 18).
An RTU Open retrofit installation may require the following field-supplied components:
•wiring harness: Part #OPN-RTUHRN
•transformer – 24 Vac, 20 VA minimum
•wiring
Application-dependent components:
•carbon dioxide sensors
•damper/damper actuator
•differential pressure switch
•enthalpy switch
•fan status switch
•door switch
•fan section door switch
•relative humidity sensor
•remote occupancy contact
•smoke detector
•temperature sensors
RTU Open |
5 |
Installation
When you handle the RTU Open:
•Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.
•Do not touch components or leads.
•Handle the board by its edges.
•Isolate from high voltage or electrostatic discharge.
•Ensure that you are properly grounded.
When you mount the RTU Open:
•Do not locate in an area that is exposed to moisture, vibration, dust, or foreign material.
•Follow NEC and local electrical codes.
•Do not obstruct access for unit maintenance.
•Protect from impact or contact during unit maintenance.
We highly recommend that you mount the RTU Open in the unit control panel!
6 |
RTU Open |
Screw the RTU Open into an enclosed panel using the mounting slots on the cover plate. Leave about 2 in. (5 cm) on each side of the controller for wiring.
CAUTIONS
○The RTU Open is powered by a Class 2 power source. Take appropriate isolation measures when mounting it in a control panel where non-Class 2 circuits are present.
○Do not power pilot relays from the same transformer that powers the RTU Open.
○In most cases, the RTU Open will be powered from the control power transformer provided with the rooftop equipment. If you must use a separate control power transformer, additional precautions must be taken to ensure that the auxiliary transformer is in-phase with the rooftop equipment’s control power transformer. See Using an auxiliary control power transformer (page 8).
1Remove power from the 24 Vac transformer.
2Remove connector assembly from RTU Open's J1 connector.
RTU Open |
7 |
Installation
3If the rooftop equipment has thermostat connection terminals, connect wiring harness J1 wire 1 to R, and J1 wire 3 to C. Alternately, connect the control power transformer wires to J1 connector wires 1 (24 Vac) and 3 (Gnd).
4Apply power to the rooftop equipment.
5Measure the voltage at the RTU Open’s J1 terminals 1 and 3 to verify that the voltage is within the operating range of 21.6–26.4 Vac.
6Attach harness to RTU Open connector J1.
NOTE The harness and connector are keyed and must be oriented properly for correct installation.
7Verify that the Power LED is on and the Run LED is blinking.
If you use a separate control power transformer, it is essential that the auxiliary transformer and the rooftop transformer are in-phase. You must verify this prior to connecting the auxiliary transformer to the RTU Open.
Follow these steps:
1Verify the available primary voltage at the rooftop equipment.
2Remove power from the rooftop equipment and install the appropriate auxiliary transformer. Follow the manufacturer’s installation instructions.
3Ground one leg of the auxiliary transformer’s secondary wiring.
4Apply power to the rooftop equipment. Measure the potential between the rooftop equipment control power and auxiliary transformer's secondary hot (non-grounded) legs. If the voltage measured is less than 5 volts, the transformers are in-phase; proceed to step 7. If you measure a voltage greater than 24 Vac, then the phases are reversed.
5Correct the phase reversal by either of the following methods:
○Remove the ground from the secondary at the auxiliary transformer and connect it to the other secondary
○Reverse the primary wiring at the auxiliary transformer
6Repeat step 4 to rewire.
7Remove connector assembly from RTU Open's J1 connector.
8Connect the auxiliary transformer wires to J1 wires 1 (24 Vac) and 3 (Gnd).
9Apply power to the transformer.
10Measure the voltage at the RTU Open’s J1 - 1 and 3 to verify that the voltage is within the operating range of 21.6–26.4 Vac.
11Attach harness to RTU Open's connector J1. See illustration below.
NOTE The harness connectors are keyed and must be oriented properly for correct installation.
12Verify that the Power LED is on and the Run LED is blinking.
8 |
RTU Open |
Optional
*Safety chain devices, field-installed - normally closed. Apply 24 Vac to this terminal (jumper from J1 - 1 to J1 - 9) where no safety devices are installed.
**Fire shutdown device, field-installed, configurable as normally open or closed
***Enthalpy switch, field-installed - configurable as normally open or closed
The RTU Open's two rotary switches determine the RTU Open's MAC address when it is placed on an MS/TP network. The rotary switches define the MAC address portion of the RTU Open's BACnet device instance number, which is composed of the MS/TP network number and the MAC address. They also set the slave address on a Modbus or N2 network when less than 100. See the RTU Open Integration Guide for additional information on integration.
CAUTION The MAC address of the controller must be unique on its network.
RTU Open |
9 |
Installation
1Turn off the RTU Open's power. The controller reads the address each time you apply power to it.
2Using the rotary switches, set the MSB (SW1) (10's) switch to the tens digit of the address, and set the LSB (SW2) (1's) switch to the ones digit.
EXAMPLE To set the RTU Open’s address to 01, point the arrow on the MSB (SW1) switch to 0 and the arrow on the LSB (SW2) switch to 1.
3Turn on the RTU Open's power.
NOTE The factory default setting is "00" and must be changed to successfully install your RTU Open.
RTU Open's SW3 DIP switches are used to set the controller's protocol and baud rate. The protocol and speed selection is determined by the network on which the controller will be installed. For Carrier BACnet implementations, select MS/TP @ 76.8 k as follows:
1Power down the RTU Open. The controller reads the protocol and baud rate each time you apply power to it.
2Set SW3 DIP switches 1, 2, and 4 to On to configure the controller for BACnet MS/TP and 76.8 k baud.
3 Power up the RTU Open.
NOTE Other protocols and baud rates are available. See the RTU Open Integration Guide for additional instructions.
The RTU Open communicates using BACnet on an MS/TP network segment communications at 9600 bps, 19.2 kbps, 38.4 kbps, or 76.8 kbps.
Wire the controllers on an MS/TP network segment in a daisy-chain configuration.
10 |
RTU Open |
Install a BT485 on the first and last controller on a network segment to add bias and prevent signal distortions due to echoing.
See the MS/TP Networking and Wiring Installation Guide for more details.
Cable: |
22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire |
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Maximum length: |
2000 feet (610 meters) |
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1Pull the screw terminal connector from the controller's power terminals labeled Gnd and 24 Vac or Hot.
2Check the communications wiring for shorts and grounds.
3Connect the communications wiring to the BACnet port’s screw terminals labeled Net +, Net -, and
Shield.
NOTE Use the same polarity throughout the network segment.
4Verify that the MSTP jumper is set to MSTP.
5Set DIP switches 1 and 2 to the appropriate baud rate. See the MSTP baud diagram on the RTU Open. The default baud rate is 76.8 kbps.
NOTE Use the same baud rate for all controllers on the network segment.
6Insert the power screw terminal connector into the RTU Open's power terminals.
7Verify communication with the network by viewing a module status report.
RTU Open |
11 |
Installation
RTU Open Inputs and Outputs Table
Channel |
Type |
Signal |
Function |
Part Number |
Wire/Terminal |
Alternate |
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Number |
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Numbers |
Terminals |
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Input 1 |
AI |
4-20 mA |
CO2 |
33ZCT55CO2 |
J4 |
- 5 & 6 |
N/A |
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OAQ |
33ZCT56CO2 |
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Space Relative Humidity |
33ZCSENCO2 w/ |
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33ZCASPCO2 |
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33ZCSENSRH-01 |
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Input 2 |
AI |
4-20 mA |
CO2 |
33ZCT55CO2 |
J4 |
- 2 & 3 |
N/A |
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OAQ |
33ZCT56CO2 |
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Space Relative Humidity |
33ZCSENCO2 w/ |
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33ZCASPCO2 |
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33ZCSENSRH-01 |
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Input 3 |
BI |
24 Vac |
Compressor Safety ** |
N/A |
J1 |
- 2 |
J5 - 5 & 6 |
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Fan Status |
33CSAS-01 |
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*** |
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Filter Status |
33CSFS=01 |
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Remote Occupancy |
Field-supplied |
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Door Contact |
Field-supplied |
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Input 4 |
BI |
24 Vac |
Safety Chain * |
N/A |
J1 |
- 9 |
N/A |
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Input 5 |
BI |
24 Vac |
Fire Shutdown ** |
Field-supplied |
J1 |
- 10 |
J5 - 3 & 4 |
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Fan Status |
33CSAS-01 |
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*** |
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Filter Status |
33CSFS-01 |
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Remote Occupancy |
Field-supplied |
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Door Contact |
Field-supplied |
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Input 6 |
AI |
10K |
Supply Air Temperature |
33ZCSENSAT |
J2 |
- 1 & 2 |
N/A |
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Thermistor |
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33ZCSENDAT |
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Input 7 |
AI |
10K |
Outside Air Temperature |
33ZCSENOAT |
J2 |
- 3 & 2 |
N/A |
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Thermistor |
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Input 8 |
BI |
24 Vac |
Enthalpy ** |
33SENTHSW |
J2 |
- 6 & 7 |
J5 - 1 & 2 |
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Fan Status |
33CSAS-01 |
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*** |
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Filter Status |
33CSFS-01 |
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Remote Occupancy |
Field-supplied |
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Door Contact |
Field-supplied |
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Input 9 |
BI |
24 Vac |
Humidistat ** |
TSTATCCPLH01-B |
J5 |
- 7 & 8 |
N/A |
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Fan Status |
33CSAS-01 |
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Filter Status |
33CSFS-01 |
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Remote Occupancy |
Field-supplied |
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Door Contact |
Field-supplied |
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Input 10 |
AI |
10K |
Space Temperature |
33ZCT55SPT 33ZCT56SPT |
J20 - 1 & 2 |
N/A |
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Thermistor |
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33ZCT59SPT |
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Input 11 |
AI |
100K |
Space Temperature |
33ZCT56SPT 33ZCT59SPT |
J20 - 3 & 4 |
N/A |
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Thermistor |
Setpoint Adjust |
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Rnet |
AI |
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Zone Temperature |
SPS / SPPL / SPP |
J13 - 1, 2, 3, 4 |
N/A |
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AO - 1 |
AO |
Economizer |
Economizer |
Actuator-Field-supplied |
J2 |
- 5 & 4 |
N/A |
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AO - 2 |
AO |
N/A |
Not used |
N/A |
J22 - 1 & 2 |
N/A |
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BO - 1 |
BO |
N/A - Relay |
Fan (G) |
N/A |
J1 |
- 4 |
N/A |
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BO - 2 |
BO |
N/A - Relay |
Heat 2 (W2) Output |
N/A |
J1 |
- 5 |
N/A |
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BO - 3 |
BO |
N/A - Relay |
Heat 1 (W1) Output |
N/A |
J1 |
- 6 |
N/A |
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BO - 4 |
BO |
N/A - Relay |
Cool 2 (Y2) Output |
N/A |
J1 |
- 7 |
N/A |
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BO - 5 |
BO |
N/A - Relay |
Cool 1 (Y1) Output |
N/A |
J1 |
- 8 |
N/A |
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BO - 6 |
BO |
N/A - Relay |
Humidi-MiZer™ |
N/A |
J11 - 7 & 8 |
N/A |
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BO - 7 |
BO |
N/A - Relay |
Reversing Valve |
N/A |
J11 - 4 & 6 |
N/A |
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12 |
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RTU Open |
Channel |
Type |
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Signal |
Function |
Part Number |
Wire/Terminal |
Alternate |
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Number |
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Numbers |
Terminals |
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BO - 8 |
BO |
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N/A - Relay |
Power Exhaust |
N/A |
J11 - 1 & 3 |
N/A |
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Legend |
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AI - |
Analog Input |
AO - |
Analog Output |
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BI - |
Digital Input |
BO - |
Digital Output |
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* 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 utilized. See To wire inputs and outputs (page 14) 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 (OPN-RTUHRN). See To wire inputs and outputs (page 14) for additional information.
Input |
Maximum length |
Minimum gauge |
Shielding |
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Thermistor |
1000 feet |
22 AWG |
Unshielded |
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(305 meters) |
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4-20 mA |
3000 feet |
22 AWG |
Unshielded |
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(914 meters) |
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1000 feet |
22 AWG |
Unshielded |
Binary input |
(305 meters) |
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SPT (RNET) |
500 feet |
22 AWG |
Unshielded |
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(152 meters) |
4 conductor |
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These RTU Open inputs accept the following signal types:
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These |
Support this |
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inputs... |
signal type... |
Description |
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1, 2 |
4-20 mA |
The input resistance on the positive (+) terminal is 250 Ohms. |
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The Aux Power Out terminal is capable of supplying 24 Vdc to |
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a 4-20 mA transducer, but the total current demanded must |
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not exceed 40 mA. If the voltage measured from the Aux |
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Power Out terminal to Gnd is less than 18 Vdc, you need to |
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use an external power supply. |
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3, 5, 8, 9 |
Binary (24 Vac) |
24 Vac voltage, resulting in a 25 mA maximum sense current |
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when the contacts are closed |
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6, 7, 10 |
Thermistor |
10 kOhm at 77° F |
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11 |
100k Potentiometer |
Typically used for 33CZT56SPT Setpoint Offset Potentiometer |
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RTU Open |
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13 |
Installation
The RTU Open has 8 binary outputs. You can connect each output to a maximum of 24 Vac/Vdc. Each output is a dry contact rated at 3 A, 24 V maximum, and is normally open.
To size output wiring, consider the following:
•Total loop distance from the power supply to the controller, and then to the controlled device
NOTE Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length.
•Acceptable voltage drop in the wire from the controller to the controlled device
•Resistance (Ohms) of the chosen wire gauge
•Maximum current (Amps) the controlled device requires to operate
The RTU Open has 1 analog output that supports voltage or current devices. The controlled device must share the same ground as the controller and have input impedance of 500 Ohms maximum for the 4-20 mA mode on AO - 1.
1Turn off the RTU Open's power.
2Connect the input wiring to the screw terminals on the RTU Open.
3Turn on the RTU Open's power.
4Set the appropriate jumpers on the RTU Open.
J3 |
AO - 1 |
0 - 10 Vdc/4-20 mA |
W1 |
Battery Jumper |
In (Do not remove) |
W2 |
Format Jumper* |
Out |
W3 |
Input 11 mA Jumper |
Out (mA not utilized on this channel) |
W4 |
Input 11 Thermistor |
In (default position) |
W5 |
Input 10 mA Jumper |
Out (mA not utilized on this channel) |
W6 |
Input 10 Thermistor Jumper |
In (default position) |
*Formatting the controller may result in lost information and should only be done under the guidance of Carrier Control Systems Support.
14 |
RTU Open |
Optional
*Safety chain devices, field-installed - normally closed. Apply 24 Vac to this terminal (jumper from J1 - 1 to J1 - 9) where no safety devices are installed.
**Fire shutdown device, field-installed, configurable as normally open or closed
***Enthalpy switch, field-installed - configurable as normally open or closed
J4 Inputs
1Turn off the RTU Open's power.
2Connect the input and output wiring to the screw terminals on the RTU Open.
NOTE When utilizing the controller's 24 Vdc auxiliary power out, the total current demand for these two input channels must not exceed 40 mA (100mA per channel).
RTU Open |
15 |
Installation
NOTE J4 Analog Inputs 1 and 2 may be set for the following device types:
○IAQ Sensor
○OAQ Sensor
○Space RH Sensor
J5 Inputs
The terminals for Inputs 3, 5, and 8 are available for use in place of the flying wire leads at Molex connectors J1 and J2 identified below:
NOTE J5 binary inputs 3, 5, and 8 are the same input channels as:
○J1 wire 2, J5 - Input - 3 (Compressor Safety)
○J1 wire 10, J5 - Input - 5 (Fire Shutdown)
○J2 wire 6, J5 - Input - 8 (Enthalpy Switch).
16 |
RTU Open |
These terminals are available for use in place of the flying wire leads at Molex connectors J1 and J2. Binary inputs are configurable and may be used for the following functions:
Input |
Default input function |
Additional functions |
3 |
Compressor Safety |
Fan Status |
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Filter Status |
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Remote Occupancy |
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Door Contact |
5 |
Fire Shutdown |
Fan Status |
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Filter Status |
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Remote Occupancy |
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Door Contact |
8 |
Enthalpy Switch |
Fan Status |
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Filter Status |
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Remote Occupancy |
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Door Contact |
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9 |
HumidiStat |
Fan Status |
Filter Status
Remote Occupancy
Door Contact
J11 Outputs
RTU Open |
17 |
Installation
NOTE Output relay contacts rated at 3A, 24V maximum. Install pilot relays required by application.
NOTE J20 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.
You may wire various sensors to the RTU Open's inputs. See the table below for details.
NOTE This document gives instructions for wiring the sensors to the RTU Open. For specific mounting and wiring instructions, see the Carrier Sensors Installation 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.
1Pass the control wires through the hole provided in the corner post.
2Feed the wires through the raceway to the RTU Open.
3Connect the wires to the removable Phoenix connectors.
4Reconnect the connectors to the board (where removed).
18 |
RTU Open |
NOTE For rooftop unit installation, see the base unit installation instructions.
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.
The RTU Open controller is configurable with the following field-supplied sensors:
Sensor |
Part numbers |
Notes |
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Space temperature sensor |
SPS, SPPL, SPP, 33ZCT55SPT, |
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(page 20) |
33ZCT56SPT, 33ZCT59SPT |
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Supply air temperature sensor |
33ZCSENSAT |
Factory-installed |
(page 21) |
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Duct air temperature sensor |
33ZCSENDAT |
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(page 22) |
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Outdoor air temperature sensor |
33ZCSENOAT |
Factory-supplied with Economizer |
(page 23) |
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CO2 sensor (page 24) |
33ZCSENCO2, 33ZCT55CO2, |
Required only for demand control |
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33ZCT56CO2 |
ventilation - a dedicated 24-vac |
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transformer is required |
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Outdoor air quality sensor (page |
33ZCTSENCO2 |
Optional with demand control |
25) |
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ventilation |
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Duct relative humidity sensor |
33ZCSENDRH-01 |
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(page 26) |
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Space relative humidity sensor |
33ZCSENSRH-01 |
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(page 26) |
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Humidistat (page 27) |
TSTATCCPLH01-B |
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CO2 aspirator box (page 24) |
C33ZCCASPCO2 |
Required for CO2 return duct/outside |
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air applications |
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Outdoor air enthalpy switch |
33CSENTHSW |
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(page 28) |
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Return air enthalpy sensor |
33CSENTSEN |
Optional with |
(page 28) |
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33CSSENTHSW |
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Filter status switch (page 31) |
33CSFS-01 |
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Fan status switch (page 31) |
33CSAS-01 or field-supplied |
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For specific details about sensors, see the Carrier Sensors Installation Guide.
RTU Open |
19 |
Installation
The RTU Open is connected to a wall-mounted space temperature sensor to monitor room temperature. An i-Vu Open Control System offers the following SPT sensors:
Sensor |
Part # |
Features |
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SPT Standard |
SPS |
• |
Local access port |
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• |
No operator control |
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SPT Plus |
SPPL |
• |
Slide potentiometer to adjust setpoint |
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• MANUAL ON button to override schedule |
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• LED to show occupied status |
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• |
Local access port |
SPT Pro |
SPP |
• |
LCD display |
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• MANUAL ON button to override schedule |
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• WARMER and COOLER buttons to adjust setpoint |
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• INFO button to cycle through zone and outside air temperatures, |
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• |
setpoints, and local override time |
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Local access port |
You wire SPT sensors to the RTU Open's Rnet port. An Rnet can consist of any of the following combinations of devices wired in a daisy-chain configuration:
•1 SPT Plus or SPT Pro
•1–4 SPT Standards
•1–4 SPT Standards, and 1 SPT Plus or SPT Pro
•Any of the above combinations, plus up to 2 BACview6's but no more than 6 devices total
NOTES
•If you have 2 BACview6's, the second BACview6 must have a separate power supply with the same ground as the controller.
•If the Rnet has multiple SPT Standard sensors, you must give each a unique address on the Rnet. See the Carrier Sensors Installation Guide.
•If the Rnet has multiple BACviews, you must give each a unique address on the Rnet. See the BACview Installation and User Guide.
NOTE Use the specified type of wire and cable for maximum signal integrity.
Description |
4 conductor, unshielded, CMP, plenum rated cable |
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Conductor |
18 AWG |
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Maximum length |
500 feet (152 meters) |
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Recommended coloring |
Jacket: White |
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Wiring: Black, white, green, red |
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UL temperature rating |
32–167°F (0–75°C) |
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20 |
RTU Open |