Carrier 1-808-427-01 User Manual

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Carrier 1-808-427-01 User Manual

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

 

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

 

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

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 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

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

 

 

Access port J12

To connect a BACview6 Handheld, Virtual BACview, or Field Assistant

Rnet port J13

For SPT sensors and a BACview6 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 SPT Plus or SPT Pro

 

Any of the above combinations, plus a BACview6, but no more than 6 devices

 

total

 

 

 

Comm Option port

For communication with the LonWorks Option Card.

 

 

 

Inputs

12 inputs:

 

 

Inputs 1 - 2:

4-20 mA only

 

Inputs 3, 5, 8, 9:

Binary, 24 Vac

 

Inputs 6 - 7:

Thermistor

 

Inputs 10 - 11:

Thermistor

 

Rnet sensor

 

 

 

Binary outputs

8 relay outputs, contacts rated at 3 A max @ 24 Vac

 

Configured normally open.

 

 

 

Analog output

1 analog output

 

 

AO1: 2 - 10 Vdc or 4-20 mA

 

 

 

Output resolution

10 bit D/A

 

 

 

Real-time clock

Battery-backed real-time clock keeps track of time in event of power failure

 

 

Battery

10-year Lithium CR2032 battery provides a minimum of 10,000 hours of

 

data retention during power outages

 

 

Protection

Incoming power and network connections are protected by non-replaceable

 

internal solid-state polyswitches that reset themselves when the condition

 

that causes a fault returns to normal. The power, network, and output

 

connections are also protected against voltage transient and surge events.

 

 

Status indicators

LED's indicate status of communications, running, errors, power, and digital

 

outputs

 

 

 

Environmental operating

-40 to 158°F (-40 to 70°C), 10–95% relative humidity, non-condensing

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)

 

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 RTU Open before wiring it. Failure to follow this warning could cause electrical shock, personal injury, or damage to the controller.

4

RTU Open

Installation

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).

Field-supplied hardware

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

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.

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.

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 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).

Using the rooftop equipment control power transformer

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.

Using an auxiliary control power transformer

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

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 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.

To set the RTU Open's communications protocol and baud rate

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.

Wiring the RTU Open to the MS/TP network

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.

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

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

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

J4

- 5 & 6

N/A

 

 

 

 

OAQ

33ZCT56CO2

 

 

 

 

 

 

 

Space Relative Humidity

33ZCSENCO2 w/

 

 

 

 

 

 

 

 

33ZCASPCO2

 

 

 

 

 

 

 

 

33ZCSENSRH-01

 

 

 

 

Input 2

AI

4-20 mA

CO2

33ZCT55CO2

J4

- 2 & 3

N/A

 

 

 

 

OAQ

33ZCT56CO2

 

 

 

 

 

 

 

Space Relative Humidity

33ZCSENCO2 w/

 

 

 

 

 

 

 

 

33ZCASPCO2

 

 

 

 

 

 

 

 

33ZCSENSRH-01

 

 

 

 

Input 3

BI

24 Vac

Compressor Safety **

N/A

J1

- 2

J5 - 5 & 6

 

 

 

 

Fan Status

33CSAS-01

 

 

***

 

 

 

 

Filter Status

33CSFS=01

 

 

 

 

 

 

 

Remote Occupancy

Field-supplied

 

 

 

 

 

 

 

Door Contact

Field-supplied

 

 

 

 

 

 

 

 

 

 

 

 

 

Input 4

BI

24 Vac

Safety Chain *

N/A

J1

- 9

N/A

 

Input 5

BI

24 Vac

Fire Shutdown **

Field-supplied

J1

- 10

J5 - 3 & 4

 

 

 

 

Fan Status

33CSAS-01

 

 

***

 

 

 

 

Filter Status

33CSFS-01

 

 

 

 

 

 

 

Remote Occupancy

Field-supplied

 

 

 

 

 

 

 

Door Contact

Field-supplied

 

 

 

 

Input 6

AI

10K

Supply Air Temperature

33ZCSENSAT

J2

- 1 & 2

N/A

 

 

 

Thermistor

 

33ZCSENDAT

 

 

 

 

Input 7

AI

10K

Outside Air Temperature

33ZCSENOAT

J2

- 3 & 2

N/A

 

 

 

Thermistor

 

 

 

 

 

 

Input 8

BI

24 Vac

Enthalpy **

33SENTHSW

J2

- 6 & 7

J5 - 1 & 2

 

 

 

 

Fan Status

33CSAS-01

 

 

***

 

 

 

 

Filter Status

33CSFS-01

 

 

 

 

 

 

 

Remote Occupancy

Field-supplied

 

 

 

 

 

 

 

Door Contact

Field-supplied

 

 

 

 

Input 9

BI

24 Vac

Humidistat **

TSTATCCPLH01-B

J5

- 7 & 8

N/A

 

 

 

 

Fan Status

33CSAS-01

 

 

 

 

 

 

 

Filter Status

33CSFS-01

 

 

 

 

 

 

 

Remote Occupancy

Field-supplied

 

 

 

 

 

 

 

Door Contact

Field-supplied

 

 

 

 

Input 10

AI

10K

Space Temperature

33ZCT55SPT 33ZCT56SPT

J20 - 1 & 2

N/A

 

 

 

Thermistor

 

33ZCT59SPT

 

 

 

 

Input 11

AI

100K

Space Temperature

33ZCT56SPT 33ZCT59SPT

J20 - 3 & 4

N/A

 

 

 

Thermistor

Setpoint Adjust

 

 

 

 

 

Rnet

AI

 

Zone Temperature

SPS / SPPL / SPP

J13 - 1, 2, 3, 4

N/A

 

 

 

 

 

 

 

 

 

 

AO - 1

AO

Economizer

Economizer

Actuator-Field-supplied

J2

- 5 & 4

N/A

 

AO - 2

AO

N/A

Not used

N/A

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

N/A

J11 - 4 & 6

N/A

 

12

 

 

 

 

 

 

RTU Open

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 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 wiring specifications

Input

Maximum length

Minimum gauge

Shielding

 

 

 

 

Thermistor

1000 feet

22 AWG

Unshielded

 

(305 meters)

 

 

 

 

 

 

4-20 mA

3000 feet

22 AWG

Unshielded

 

(914 meters)

 

 

 

 

 

 

 

1000 feet

22 AWG

Unshielded

Binary input

(305 meters)

 

 

 

 

 

 

SPT (RNET)

500 feet

22 AWG

Unshielded

 

(152 meters)

4 conductor

 

 

 

 

 

Inputs

These RTU Open inputs accept the following signal types:

 

These

Support this

 

 

inputs...

signal type...

Description

 

 

 

 

1, 2

4-20 mA

The input resistance on the positive (+) terminal is 250 Ohms.

 

 

 

The Aux Power Out terminal is capable of supplying 24 Vdc to

 

 

 

a 4-20 mA transducer, but the total current demanded must

 

 

 

not exceed 40 mA. If the voltage measured from the Aux

 

 

 

Power Out terminal to Gnd is less than 18 Vdc, you need to

 

 

 

use an external power supply.

 

 

 

 

3, 5, 8, 9

Binary (24 Vac)

24 Vac voltage, resulting in a 25 mA maximum sense current

 

 

 

when the contacts are closed

 

 

 

 

6, 7, 10

Thermistor

10 kOhm at 77° F

 

 

 

 

11

100k Potentiometer

Typically used for 33CZT56SPT Setpoint Offset Potentiometer

 

 

 

 

RTU Open

 

13

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 the controller to the controlled device

Resistance (Ohms) of the chosen wire gauge

Maximum current (Amps) the controlled device requires to operate

Analog output

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.

To wire inputs and outputs

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

 

 

Filter Status

 

 

Remote Occupancy

 

 

Door Contact

5

Fire Shutdown

Fan Status

 

 

Filter Status

 

 

Remote Occupancy

 

 

Door Contact

8

Enthalpy Switch

Fan Status

 

 

Filter Status

 

 

Remote Occupancy

 

 

Door Contact

 

 

 

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.

Wiring sensors to inputs

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.

Field-supplied sensor hardware

The RTU Open controller is configurable with the following field-supplied sensors:

Sensor

Part numbers

Notes

 

 

 

Space temperature sensor

SPS, SPPL, SPP, 33ZCT55SPT,

 

(page 20)

33ZCT56SPT, 33ZCT59SPT

 

 

 

 

Supply air temperature sensor

33ZCSENSAT

Factory-installed

(page 21)

 

 

 

 

 

Duct air temperature sensor

33ZCSENDAT

 

(page 22)

 

 

 

 

 

Outdoor air temperature sensor

33ZCSENOAT

Factory-supplied with Economizer

(page 23)

 

 

 

 

 

CO2 sensor (page 24)

33ZCSENCO2, 33ZCT55CO2,

Required only for demand control

 

33ZCT56CO2

ventilation - a dedicated 24-vac

 

 

transformer is required

 

 

 

Outdoor air quality sensor (page

33ZCTSENCO2

Optional with demand control

25)

 

ventilation

 

 

 

Duct relative humidity sensor

33ZCSENDRH-01

 

(page 26)

 

 

 

 

 

Space relative humidity sensor

33ZCSENSRH-01

 

(page 26)

 

 

 

 

 

Humidistat (page 27)

TSTATCCPLH01-B

 

 

 

 

CO2 aspirator box (page 24)

C33ZCCASPCO2

Required for CO2 return duct/outside

 

 

air applications

 

 

 

Outdoor air enthalpy switch

33CSENTHSW

 

(page 28)

 

 

 

 

 

Return air enthalpy sensor

33CSENTSEN

Optional with

(page 28)

 

33CSSENTHSW

 

 

 

Filter status switch (page 31)

33CSFS-01

 

 

 

 

Fan status switch (page 31)

33CSAS-01 or field-supplied

 

 

 

 

For specific details about sensors, see the Carrier Sensors Installation Guide.

RTU Open

19

Installation

Wiring an SPT sensor

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

 

 

 

 

SPT Standard

SPS

Local access port

 

 

No operator control

 

 

 

 

SPT Plus

SPPL

Slide potentiometer to adjust setpoint

 

 

• MANUAL ON button to override schedule

 

 

• LED to show occupied status

 

 

Local access port

SPT Pro

SPP

LCD display

 

 

• MANUAL ON button to override schedule

 

 

• WARMER and COOLER buttons to adjust setpoint

 

 

• INFO button to cycle through zone and outside air temperatures,

 

 

setpoints, and local override time

 

 

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.

Rnet wiring specifications

NOTE Use the specified type of wire and cable for maximum signal integrity.

Description

4 conductor, unshielded, CMP, plenum rated cable

 

 

Conductor

18 AWG

 

 

Maximum length

500 feet (152 meters)

 

 

Recommended coloring

Jacket: White

 

Wiring: Black, white, green, red

 

 

UL temperature rating

32–167°F (0–75°C)

 

 

20

RTU Open

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