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RTU Open
RTU Open
Installation and Start-up Guide
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
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Table of Contents Introduction .................................................................................................................................................................. 1 What is the RTU Open controller? ...................................................................................................................... 1 Specifications ..............................................................................................................................
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Table of Contents Wiring a status switch ......................................................................................................................... 31 Wiring specifications ................................................................................................................ 31 To wire a status switch to the controller ................................................................................. 32 Wiring a compressor safety ...................................
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Table of Contents Linkage ................................................................................................................................................................ 71 I/O Points ............................................................................................................................................................ 71 Appendix B: Single Point Linkage and Device Address Binding ........................................................................
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Introduction What is the RTU Open controller? The RTU Open controller is available as an integrated component of a Carrier rooftop unit, or as a field- installed 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 followi
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Introduction 2 RTU Open
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Specifications RTU Open driver drv_rtuopn_std Power 24 Vac ±10%, 50–60 Hz 20 VA power consumption (26 VA with BACview attached) 26 Vdc (25 V min, 30 V max) Single Class 2 source only, 100 VA or less 6 Access port J12 To connect a BACview Handheld, Virtual BACview, or Field Assistant 6 Rnet port J13 For SPT sensors and a BACview in any of the following combinations, wired in a daisy-chain configuration: • 1 SPT Plus or SPT Pro • 1–4 SPT Standards • 1–4 SPT Standards, and 1 S
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Introduction Overall dimensions A: 6-1/2 in. (16.5 cm) B: 6-1/2 in. (16.5 cm) Mounting dimensions 7 mounting holes in various positions Panel depth 2-1/2 in. (6.4 cm) Weight 11.2 oz (0.32 kg) BACnet support Conforms to the Advanced Application Controller (B-AAC) Standard Device Profile as defined in ANSI/ASHRAE Standard 135-2004 (BACnet) Annex L Listed by UL-873, FCC Part 15-Subpart B-Class A, CE EN50082-1997 Safety considerations Disconnect electrical power to the R
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Installation To install the RTU Open: 1 Mount the controller (page 6). 2 Wire the controller for power (page 7). ○ Using the rooftop equipment control power transformer (page 7). ○ Using an auxiliary control power transformer (page 8). 3 Set the controller's address (page 9). 4 Wire inputs and outputs (page 12). 5 Wire sensors to the controller (page 18). Field-supplied hardware An RTU Open retrofit installation may require the following field-supplied components: • wir
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Installation To mount the RTU Open 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. •
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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. To wire the controller for power 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
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Installation 3 If 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). 4 Apply power to the rooftop equipment. 5 Measure 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. 6 Attach harness to RTU Open connector J1. NOTE The harness and connecto
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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 To set the RTU Open's address The RTU Open's two rotary switches determine the RTU Open's MAC address when it is placed on an MS/TP netw
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Installation 1 Turn off the RTU Open's power. The controller reads the address each time you apply power to it. 2 Using 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. 3 Turn on the RTU Open's power. NOTE The factory default setting is "00" and must be cha
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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. Wiring specifications Cable: 22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire Maximum length: 2000 feet (610 meters) To wire the controller to the network 1 Pull the screw terminal connector from the controller's power terminals la
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Installation Wiring inputs and outputs RTU Open Inputs and Outputs Table Channel Type Signal Function Part Number Wire/Terminal Alternate Number Numbers Terminals Input 1 AI 4-20 mA CO2 33ZCT55CO2 N/A J4 - 5 & 6 33ZCT56CO2 OAQ 33ZCSENCO2 w/ Space Relative Humidity 33ZCASPCO2 33ZCSENSRH-01 Input 2 AI 4-20 mA CO2 33ZCT55CO2 N/A J4 - 2 & 3 33ZCT56CO2 OAQ 33ZCSENCO2 w/ Space Relative Humidity 33ZCASPCO2 33ZCSENSRH-01 Input 3 BI 24 Vac Compressor Safety ** N/A J1 - 2 J5 -
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Channel Type Signal Function Part Number Wire/Terminal Alternate Number Numbers Terminals BO - 8 BO N/A - Relay Power Exhaust N/A J11 - 1 & 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 utilized. See To wire inputs and outputs (page 14) for additional information on the RTU Open wiring harn
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Installation Binary outputs 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 t
