Carrier 11-808-427-01 User Manual

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Page 1

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Page 2

Page 3

Introduction .................................................................................................................................................................. 1

Installation ................................................................................................................................................................... 5

Table of Contents

What is the RTU Open controller? ...................................................................................................................... 1

Specifications ........................................................................................................................................................ 3

Safety considerations........................................................................................................................................... 4

Field-supplied hardware ...................................................................................................................................... 5

To mount the RTU Open ....................................................................................................................................... 6

To wire the controller for power.......................................................................................................................... 7

Using the rooftop equipment control power transformer ................................................................... 8

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 ................................................................................................. 11

Wiring specifications ........................................................................................................................... 11

To wire the controller to the network ................................................................................................. 11

Wiring inputs and outputs ................................................................................................................................ 12

Input wiring specifications .................................................................................................................. 13

Inputs ................................................................................................................................................... 14

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 ............................................................................................ 22

Wiring specifications ................................................................................................................ 22

To wire the SAT sensor to the controller ................................................................................. 22

Wiring a Duct Air Temperature sensor ............................................................................................... 22

Wiring specifications ................................................................................................................ 23

To wire a duct sensor to the controller ................................................................................... 23

Wiring an Outdoor Air Temperature sensor ....................................................................................... 23

Wiring specifications ................................................................................................................ 24

To wire an OAT sensor to the controller .................................................................................. 24

Wiring a CO2 sensor ............................................................................................................................ 24

Wiring specifications ................................................................................................................ 25

To wire the CO2 sensor to the controller ................................................................................ 25

Wiring an Outdoor Air Quality sensor ................................................................................................. 26

Wiring specifications ................................................................................................................ 27

To wire the OAQ sensor to the controller ................................................................................ 27

Wiring a Relative Humidity sensor ..................................................................................................... 27

Wiring specifications ................................................................................................................ 28

To wire the RH sensor to the controller................................................................................... 28

Wiring a Humidistat ............................................................................................................................. 28

Wiring specifications ................................................................................................................ 29

To wire a humidistat to the controller ..................................................................................... 29

Wiring an enthalpy switch ................................................................................................................... 29

Wiring specifications ................................................................................................................ 30

To wire an enthalpy switch (outdoor air) to the controller ..................................................... 30

To wire an enthalpy switch (differential) to the controller...................................................... 32

RTU Open i

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Table of Contents

Start-up ....................................................................................................................................................................... 36

Sequence of Operation ............................................................................................................................................. 43

Troubleshooting ......................................................................................................................................................... 56

Compliance ................................................................................................................................................................ 58

Appendix A: RTU Open Points/Properties .............................................................................................................. 59

Wiring a status switch ......................................................................................................................... 32

Wiring specifications ................................................................................................................ 32

To wire a status switch to the controller ................................................................................. 33

Wiring a compressor safety ................................................................................................................ 33

Wiring specifications ................................................................................................................ 33

To wire a compressor safety input to the controller ............................................................... 34

Wiring an occupancy switch or door contact ..................................................................................... 34

Wiring specifications ................................................................................................................ 34

To wire an occupancy switch or door contact ......................................................................... 35

Service Test ......................................................................................................................................................... 37

Configuring the RTU Open's properties .......................................................................................................... 38

Unit Configuration properties ............................................................................................................. 38

Setpoint properties.............................................................................................................................. 40

Service Configuration properties ........................................................................................................ 41

Occupancy ........................................................................................................................................................... 43

Supply fan ........................................................................................................................................................... 44

Cooling ................................................................................................................................................................. 44

Economizer ......................................................................................................................................................... 45

Power Exhaust .................................................................................................................................................... 46

Unoccupied Free Cooling .................................................................................................................................. 46

Optimal Start ...................................................................................................................................................... 46

Enthalpy control ................................................................................................................................................. 47

Indoor Air CO2 .................................................................................................................................................... 47

Heating ................................................................................................................................................................ 48

Heat Pump operation ........................................................................................................................................ 49

Dehumidification ............................................................................................................................................... 49

Demand Limiting ............................................................................................................................................... 50

Door contact ....................................................................................................................................................... 50

Remote occupancy ............................................................................................................................................ 50

Fire Shutdown .................................................................................................................................................... 50

Compressor Safety ............................................................................................................................................ 50

Fan Status ........................................................................................................................................................... 51

Filter status ......................................................................................................................................................... 51

Alarms ................................................................................................................................................................. 51

Linkage ................................................................................................................................................................ 53

Linkage Air Source Modes ................................................................................................................................ 55

Serial number ..................................................................................................................................................... 56

LED's .................................................................................................................................................................... 56

Replacing the RTU Open's battery .................................................................................................................. 57

FCC Compliance ................................................................................................................................................. 58

CE Compliance ................................................................................................................................................... 58

BACnet Compliance........................................................................................................................................... 58

Status................................................................................................................................................................... 59

Unit Configuration .............................................................................................................................................. 60

Setpoints ............................................................................................................................................................. 63

Alarm Configuration .......................................................................................................................................... 67

Service Configuration ........................................................................................................................................ 68

Maintenance ....................................................................................................................................................... 70

Alarms ................................................................................................................................................................. 71

ii RTU Open

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Table of Contents

Appendix B: Single Point Linkage and Device Address Binding ............................................................................ 75

Index ........................................................................................................................................................................... 77

Linkage ................................................................................................................................................................ 73

I/O Points ............................................................................................................................................................ 73

Single Point Linkage ......................................................................................................................................... 75

Device Address Binding .................................................................................................................................... 76

RTU Open iii

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What is the RTU Open controller?

J12

Introduction

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 BACview®6 Handheld or Virtual BACview can be used with the RTU Open controller via the

Access Port. See illustration on the following page.

RTU Open 1

Page 8

Introduction

2 RTU Open

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Specifications

J12

J13

Driver drv_rtuopn_std

Power 24 Vac ±10%, 50–60 Hz

20 VA power consumption (26 VA with a BACview device attached) 26 Vdc (25 V min, 30 V max) Single Class 2 source only, 100 VA or less

Access port

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

Rnet port

For SPT sensors and a BACview6 device 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 BACview

device, 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 transient excess voltage/surge events lasting no more than 10 msec.

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

outputs

RTU Open 3

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Introduction

NOTE

Safety considerations

Environmental operating range

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

Overall dimensions A:

Mounting dimensions 7 mounting holes in various positions

Depth 1-11/16 in. (4.3 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

6-1/2 in. (16.5 cm) 6-1/2 in. (16.5 cm)

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

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Field-supplied hardware

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 8). ○ 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).

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

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Installation

To mount the RTU Open

We highly recommend that you mount the RTU Open in the unit control panel!

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.

6 RTU Open

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To wire the controller for power

CAUTIONS

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.

• 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.

• Carrier controllers can share a power supply as long as you:

○ Maintain the same polarity ○ Use the power supply only for Carrier controllers

• The RTU Open has an operating range of 21.6 Vac to 26.4 Vac. If voltage measured at the RTU Open's

input terminals is outside this range, the RTU Open may not work properly.

○ 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).

RTU Open 7

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Installation

Using the rooftop equipment control power transformer

NOTE

Power

Run

Using an auxiliary control power transformer

must

NOTE

Power

Run

1 Remove power from the 24 Vac transformer. 2 Remove connector assembly from RTU Open's 3 If the rooftop equipment has thermostat connection terminals, connect wiring harness

wire 3 to C. Alternately, connect the control power transformer wires to J1 connector wires 1 (24

and

connector.

wire 1 to R,

Vac) and 3 (Gnd).

4 Apply power to the rooftop equipment. 5 Measure the voltage at the RTU Open’s

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

The harness and connector are keyed and must be oriented properly for correct installation.

7 Verify that the

LED is on and the

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

verify this prior to connecting the auxiliary transformer to the RTU Open.

Follow these steps:

1 Verify the available primary voltage at the rooftop equipment. 2 Remove power from the rooftop equipment and install the appropriate auxiliary transformer. Follow the

manufacturer’s installation instructions.

3 Ground one leg of the auxiliary transformer’s secondary wiring. 4 Apply 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.

5 Correct 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

6 Repeat step 4 to rewire. 7 Remove connector assembly from RTU Open's 8 Connect the auxiliary transformer wires to

connector.

wires 1 (24 Vac) and 3 (Gnd).

9 Apply power to the transformer. 10 Measure the voltage at the RTU Open’s

- 1 and 3 to verify that the voltage is within the operating

range of 21.6–26.4 Vac.

11 Attach harness to RTU Open's connector

The harness connectors are keyed and must be oriented properly for correct installation.

12 Verify that the

LED is on and the

. See illustration below.

LED is blinking.

8 RTU Open

Page 15

Optional

To set the RTU Open's address

CAUTION

* Safety chain devices, field-installed - normally closed. Apply 24 Vac to this terminal

(jumper from

** 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.

The MAC address of the controller must be unique on its network.

- 1 to

- 9) where no safety devices are installed.

RTU Open 9

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Installation

off

MSB (SW1) (10's

LSB (SW2) (1's

EXAMPLE

MSB (SW1

LSB (SW2

CAUTION

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

SW3

NOTE

1 Turn 2 Using the rotary switches, set the

the RTU Open's power. The controller reads the address each time you apply power to it.

To set the RTU Open’s address to 01, point the arrow on the

arrow on the

) switch to the ones digit.

) switch to 1.

) switch to the tens digit of the address, and set the

) switch to 0 and the

3 Turn on the RTU Open's power.

The factory default setting is 00 and must be changed to successfully install your RTU Open.

RTU Open's 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:

1 Power down the RTU Open. The controller reads the protocol and baud rate each time you apply power to

2 Set

it.

DIP switches are used to set the controller's protocol and baud rate. The protocol and speed

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.

Other protocols and baud rates are available. See the RTU Open Integration Guide for additional

instructions.

10 RTU Open

Page 17

Wiring the RTU Open to the MS/TP network

Wiring specifications

To wire the controller to the network

Gnd

24 Vac

Hot

Net +, Net -

Shield

NOTE

MSTP

NOTE

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.

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

Maximum length: 2000 feet (610 meters)

1 Pull the screw terminal connector from the controller's power terminals labeled 2 Check the communications wiring for shorts and grounds. 3 Connect the communications wiring to the BACnet port’s screw terminals labeled

Use the same polarity throughout the network segment.

4 Verify that the 5 Set 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.

Use the same baud rate for all controllers on the network segment.

jumper is set to

and

, and

RTU Open 11

Page 18

Installation

Wiring inputs and outputs

RTU Open Inputs and Outputs Table

Channel Number

Type

Signal

Function

Part Number

Wire/Terminal Numbers

Alternate Terminals

Input 1

4-20 mA

CO2

33ZCT55CO2

33ZCSENSRH-02

N/A

Input 2

4-20 mA

CO2

33ZCT55CO2

33ZCSENSRH-02

J4 -

N/A

Input 3

24 Vac

Compressor Safety **

N/A

J1 -

Input 4

24 Vac

Safety Chain *

N/A

Input 5

24 Vac

Fire Shutdown **

Field-supplied

Input 6

10K

Supply Air Temperature

33ZCSENSAT

J2 - 1 & 2

N/A

Input 7

10K

Outside Air Temperature

33ZCSENOAT

N/A

Input 8

24 Vac

Enthalpy **

33SENTHSW

Input 9

24 Vac

Humidistat **

--HL—38MG-029

N/A

Input 10

10K

Space Temperature

33ZCT55SPT 33ZCT56SPT

J20 - 1 & 2

N/A

Input 11

100K

Space Temperature Setpoint Adjust

33ZCT56SPT 33ZCT59SPT

J20

N/A Rnet

AI Zone Temperature

SPS / SPPL / SPP

J13

N/A

AO - 1

Economizer

Actuator-Field-supplied

N/A

AO - 2

N/A

Not used

N/A

J22

N/A

BO - 1

N/A - Relay

Fan (G)

N/A

6 Insert the power screw terminal connector into the RTU Open's power terminals. 7 Verify communication with the network by viewing a module status report.

OAQ Space Relative Humidity

33ZCT56CO2 33ZCSPTCO2 w/

33ZCASPCO2

- 5 & 6

2 & 3 OAQ Space Relative Humidity

33ZCT56CO2 33ZCSPTCO2 w/

33ZCASPCO2

Thermistor

Fan Status Filter Status Remote Occupancy Door Contact

CRSTATUS005A00 CRSTATUS005A00 Field-supplied Field-supplied

33ZCSENDAT

CRSTATUS005A00 CRSTATUS005A00 Field-supplied Field-supplied

- 9

- 10

- 3 & 2

- 6 & 7

- 7 & 8

- 5 & 6

***

- 3 & 4

***

- 1 & 2

***

12 RTU Open

Thermistor

33ZCT59SPT

- 3 & 4

- 1, 2, 3, 4

- 5 & 4

- 1 & 2

- 4

Page 19

Channel Number

Type

Signal

Function

Part Number

Wire/Terminal Numbers

Alternate Terminals

BO - 2

N/A - Relay

Heat 2 (W2) Output

N/A

BO - 3

N/A - Relay

Heat 1 (W1) Output

N/A

BO - 4

N/A - Relay

Cool 2 (Y2) Output

N/A

BO - 5

N/A - Relay

Cool 1 (Y1) Output

N/A

BO - 6

N/A - Relay

Humidi-MiZer™

N/A

J11

N/A

BO - 7

N/A - Relay

Reversing Valve

N/A

J11

N/A

BO - 8

N/A - Relay

Power Exhaust

N/A

J11

N/A

Legend

Safety Chain Feedback

Run Enabled

Input wiring specifications

Input

Maximum length

Minimum gauge

Shielding

- Analog Input

- Digital Input

* safeties are utilized. See To wire inputs and outputs (page terminations.

** Default input function

*** Parallel screw terminal at J5 (J5 - 1 = J2 - 6, J5 - 3 = J1 - 10, J5 - 5 = J1 - 2) may be used in place of the associated flying leads at the harness (Part #OPN-RTUHRN). See To wire inputs and outputs (page

- Analog Output

- Digital Output

- 24 Vac required at this wire to provide

14) for additional information on the RTU Open wiring harness assembly

status. Provide a jumper from J1 - 1 to

14) for additional information.

- 5

- 6

- 7

- 8

- 7 & 8

- 4 & 6

- 1 & 3

- 9 if no

Thermistor 1000 feet

(305 meters)

4-20 mA 3000 feet

(914 meters)

Binary input

1000 feet (305 meters)

SPT (RNET) 500 feet

(152 meters)

22 AWG Unshielded

22 AWG

Unshielded

4 conductor

RTU Open 13

Page 20

Installation

Inputs

These inputs...

Support this signal type...

Description

Binary outputs

NOTE

Analog output

To wire inputs and outputs

These RTU Open inputs accept the following signal types:

1, 2 4-20 mA The input resistance on the positive (+) terminal is 250 Ohms.

3, 5, 8, 9 Binary (24 Vac) 24 Vac voltage, resulting in a 25 mA maximum sense current

6, 7, 10 Thermistor 10 kOhm at 77° F

11 100k Potentiometer Typically used for 33CZT56SPT Setpoint Offset Potentiometer

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

• Acceptable voltage drop in the wire from the controller to the controlled device

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.

when the contacts are closed

Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length.

• 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.

1 Turn off the RTU Open's power. 2 Connect the input wiring to the screw terminals on the RTU Open.

3 Turn on the RTU Open's power.

14 RTU Open

Page 21

AO - 1

0 - 10 Vdc/4-20 mA

Battery Jumper

In (Do not remove)

Format Jumper*

Out

Input 11 mA Jumper

Out (mA not utilized on this channel)

Input 11 Thermistor

In (default position)

Input 10 mA Jumper

Out (mA not utilized on this channel)

Input 10 Thermistor Jumper

In (default position)

4 Set the appropriate jumpers on the RTU Open.

J3 W1 W2

*Formatting the controller may result in lost information and should only be done under the guidance of Carrier Control Systems Support.

RTU Open 15

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

Page 22

Installation

J4 Inputs

1 Turn off the RTU Open's power. 2 Connect 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).

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:

16 RTU Open

Page 23

Compressor Safety

Fan Status

Fire Shutdown

Fan Status

Enthalpy Switch

Fan Status

HumidiStat

Fan Status

Door Contact

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).

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

Filter Status Remote Occupancy Door Contact

J11 Outputs

Filter Status Remote Occupancy Door Contact

Filter Status Remote Occupancy

RTU Open 17

Page 24

Installation

Wiring sensors to inputs

NOTE

ELECTRICAL SHOCK HAZARD

NOTE Output relay contacts rated at 3A, 24V maximum. Install pilot relays required by application.

J20 Analog Inputs 10 and 11 are reserved for a 10k Ohm space temperature sensor with an

NOTE

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.

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.

1 Pass the control wires through the hole provided in the corner post. 2 Feed the wires through the raceway to the RTU Open. 3 Connect the wires to the removable Phoenix connectors. 4 Reconnect the connectors to the board (where removed).

For rooftop unit installation, see the base unit installation instructions.

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.

18 RTU Open

Page 25

Field-supplied sensor hardware

Sensor

Part numbers

Notes

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

Space temperature sensor (page 20)

Supply air temperature sensor

SPS, SPPL, SPP, 33ZCT55SPT, 33ZCT56SPT, 33ZCT59SPT

33ZCSENSAT Factory-installed

(page 22)

Duct air temperature sensor

33ZCSENDAT

(page 22)

Outdoor air temperature sensor

33ZCSENOAT Factory-supplied with Economizer

(page 23)

CO2 sensor (page 24) 33ZCSENCO2, 33ZCT55CO2,

33ZCT56CO2

Required only for demand control ventilation - a dedicated 24-vac transformer is required

Outdoor air quality sensor (page

26)

Duct relative humidity sensor

33ZCTSENCO2 Optional with demand control

ventilation

33ZCSENDRH-02

(page 27)

Space relative humidity sensor

33ZCSENSRH-02

(page 27)

Humidistat (page 28) --HL—38MG-029

CO2 aspirator box (page 24) 33ZCASPCO2 Required for CO2 return duct/outside

air applications

Outdoor air enthalpy switch

33CSENTHSW

(page 29)

Return air enthalpy sensor (page 29)

33CSENTSEN Optional with

33CSSENTHSW

Filter status switch (page 32) CRSTATUS005A00

Fan status switch (page 32) CRSTATUS005A00 or field-

supplied

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

RTU Open 19

Page 26

Installation

Wiring an SPT sensor

Sensor

Part #

Features

SPT Standard

• Local access port

SPT Plus

• Slide potentiometer to adjust setpoint

Local access port

SPT Pro

• LCD display

Local access port

Rnet

NOTES

NOTE

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:

SPS

• No operator control

SPPL

• MANUAL ON button to override schedule

• LED to show occupied status

•

SPP

• 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

•

You wire SPT sensors to the RTU Open's

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 BACview

devices, but no more than 6 devices total

• If you have 2 BACview

devices, the second BACview6 device 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 BACview devices, you must give each a unique address on the Rnet. See the

BACview Installation and User Guide.

Rnet wiring specifications

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

UL temperature rating 32–167°F (0–75°C)

20 RTU Open

Wiring: Black, white, green, red

Page 27

Outer Jacket

Inner insulation

.25 in. (.6 cm)

NOTE

Connect this wire...

To this terminal...

Voltage 300 Vac, power limited

Listing UL: NEC CL2P, or better

To wire the SPT sensor to the controller

1 Partially cut, then bend and pull off the outer jacket of the Rnet cable(s). Do not nick the inner insulation.

Strip about .25 inch (.6 cm) of the inner insulation from each wire.

2 Wire each terminal on the sensor to the same terminal on the controller. See diagram below.

Carrier recommends that you use the following Rnet wiring scheme:

Red

Black

White

Green

+12V

Rnet-

Rnet+

Gnd

RTU Open 21

Page 28

Installation

Wiring a Supply Air Temperature sensor

Wiring a Duct Air Temperature sensor

Part #33ZCSENSAT

The RTU Open requires a temperature sensor installed in the supply air stream. The Supply Air Temperature (SAT) sensor is used when the rooftop unit is equipped with electric heating.

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

If >100 ft (30.5 meters) 22 AWG, shielded

Maximum length: 500 feet (152 meters)

To wire the SAT sensor to the controller

1 Connect the wiring harness (Part #OPN-RTUHRN). For details, see To wire inputs and outputs (page 14). 2 Wire the sensor to the wiring harness. See diagram below. 3 Connect to

wires 1 and 2.

4 Verify your sensor readings.

Part #33ZCSENDAT

The RTU Open requires a temperature sensor installed in the supply air stream. The Duct Temperature (DAT) sensor is generally used when the rooftop unit is NOT equipped with electric heating.

22 RTU Open

Page 29

NOTE

Wiring an Outdoor Air Temperature sensor

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

Maximum length: 500 feet (152 meters)

To wire a duct sensor to the controller

1 Connect the wiring harness (Part#OPN-RTUHRN). For details, see To wire inputs and outputs (page 14). 2 Wire the sensor to the wiring harness. See diagram below. 3 Connect to 4 Verify your sensor readings. 5 Drill .25" diameter hole. Pass sensor leads through bushing and insert assembly into hole. Secure leads

to ductwork with aluminum tape.

wires 1 and 2.

If >100 ft (30.5 meters) 22 AWG, shielded

Sensor termination requires installation of RTU Open wiring harness assembly (Part #OPN-RTUHRN).

Part #33ZCSENOAT

Outdoor Air Temperature (OAT) is required to utilize all of the RTU Open’s features. OAT may be provided by a local sensor (shown below) or a linked sensor in another controller. See Single Point Linkage (page 75).

RTU Open 23

Page 30

Installation

Wiring a CO2 sensor

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

If >100 ft (30.5 meters) 22 AWG, shielded

Maximum length: 500 feet (152 meters)

To wire an OAT sensor to the controller

wires 3 and 4.

Part #33ZCSPTCO2LCD-01 (Display model) Part #33ZCSPTCO2-01 (No display)

Part #33ZCT55CO2 (No display) Part #33ZCT56CO2 (No display)

A CO

sensor monitors carbon dioxide levels. As CO2 levels increase, the RTU Open adjusts the outside air

dampers to increase ventilation and improve indoor air quality. A CO mounted in a return air duct. Duct installation requires an Aspirator Box Accessory (Part #33ZCASPCO2).

The sensor has a range of 0–2000 ppm and a linear 4-20 mA output. The CO2 sensor’s power requirements exceed what is available at J4 - 1 and 4. Provide a dedicated 24Vac transformer or DC power supply

sensor can be wall-mounted or

24 RTU Open

Page 31

Wiring diagram for #33ZCSPTCO2:

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

Maximum length: 500 feet (152 meters)

To wire the CO2 sensor to the controller

1 Wire the sensor to the controller. See appropriate diagram below. 2 Install a field-supplied dedicated 24 Vac transformer or DC power supply. 3 Wire the sensor to the controller.

If >100 ft (30.5 meters) 22 AWG, shielded

RTU Open 25

Page 32

Installation

Wiring diagram for #33ZCT55/56CO2:

Wiring an Outdoor Air Quality sensor

Part #33ZCSPTCO2LCD-01 (Display model) Part #33ZCSPTCO2-01 (No display)

An outdoor air quality (OAQ) sensor monitors outside air carbon dioxide levels. The RTU Open uses this information, in conjunction with a CO An OAQ sensor is typically duct-mounted in the outside air stream. Duct installation requires an Aspirator Box Accessory (Part #33ZCASPCO2).

sensor, to adjust the outside air dampers to provide proper ventilation.

26 RTU Open

Page 33

Wiring diagram for #33ZCSENCO2:

NOTE

Wiring a Relative Humidity sensor

NOTE

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

Maximum length: 500 feet (152 meters)

To wire the OAQ sensor to the controller

1 Wire the sensor to the controller. See appropriate diagram below. 2 Install a field-supplied dedicated 24 Vac transformer or DC power supply. 3 Apply power and verify sensor readings.

If >100 ft (30.5 meters) 22 AWG, shielded

Sensor may be terminated at Input 1 or 2.

Wall sensor - Part #33ZCSENSRH-02 Duct sensor - Part #OPNSENRH-02

The Relative Humidity (RH) sensor may be used for zone humidity control (dehumidification) when applied to a Carrier rooftop unit equipped with the Humidi-MiZer™ option. On units not equipped for dehumidification, the sensor monitors humidity, but provides no control.

You cannot use a relative humidity sensor when using both a CO2 and OAQ sensor on the controller.

RTU Open 27

Page 34

Installation

NOTE

Wiring a Humidistat

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

If >100 ft (30.5 meters) 22 AWG, shielded

Maximum length: 500 feet (152 meters)

To wire the RH sensor to the controller

1 Strip the outer jacket from the cable for at least 4 inches (10.2 cm). Strip .25 inch (.6 cm) of insulation

from each wire.

2 Wire the sensor to the controller. See diagram below. 3 Apply power and verify sensor readings.

Sensor may be terminated at Input 1 or 2.

Locally Purchased

A humdistat may be used for zone humidity control (dehumidification) when applied to a Carrier rooftop unit equipped with the Humidi-MiZer™ option. On units not equipped for dehumidification, the humidistat will indicate a high humidity condition only.

28 RTU Open

Page 35

NOTE

Wiring an enthalpy switch

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

Maximum length: 500 feet (152 meters)

To wire a humidistat to the controller

1 Strip the outer jacket from the cable for at least 4 inches (10.2 cm). Strip .25 inch (.6 cm) of insulation

from each wire

2 Wire the humidistat to the controller. See diagram below. 3 Apply power and verify sensor readings.

If >100 ft (30.5 meters) 22 AWG, shielded

Humidistat may be return duct or space mounted.

Outdoor Air - Part #33CSENTHSW

Return air - Part #33CSENTSEN

The 33CSENTHSW is an outdoor air enthalpy switch/receiver. This control determines the suitability of the outdoor air as a cooling source, based on the heat content of the air. Differential enthalpy control requires installing a 33CSENTSEN enthalpy sensor in the rooftop unit's return air duct.

RTU Open 29

Page 36

Installation

Wiring diagram for a field-installed enthalpy switch:

NOTES

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

If >100 ft (30.5 meters) 22 AWG, shielded

Maximum length: 500 feet (152 meters)

To wire an enthalpy switch (outdoor air) to the controller

An enthalpy switch is typically mounted in the outdoor air inlet.

• Factory-installed enthalpy switches terminate at

wires 6 (switch input) and 7 (24 Vac).

• Input channel must be configured for the enthalpy contact (N.O. or N.C.) that you use.

30 RTU Open

Page 37

Wiring diagram for factory-installed enthalpy switch:

NOTE

Factory-installed enthalpy switches terminate at J2 wires 6 (switch input) and 7 (24 Vac).

RTU Open 31

Page 38

Installation

Wiring diagram for optional enthalpy sensor mounted in the return air for differential enthalpy:

Wiring a status switch

Dirty Filter

Fan Running

To wire an enthalpy switch (differential) to the controller

Filter - Part #CRSTATUS005A00 or field-supplied

Fan status - Part #CRSTATUS005A00 or field-supplied

Filter and/or fan status switches may be installed to provide a

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

Maximum length: 500 feet (152 meters)

indication or

If >100 ft (30.5 meters) 22 AWG, shielded

status.

32 RTU Open

Page 39

NOTES

Fan Status, Filter Status, Remote

Occupancy,

Door Contacts

Wiring a compressor safety

To wire a status switch to the controller

• Binary inputs 3, 5, 8, and 9 are configurable and may be used for

• Follow device manufacturer's installation and operating instructions.

This is typically provided by the manufacturer with the rooftop equipment. A compressor safety status may be monitored if available.

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

Maximum length: 500 feet (152 meters)

, if they have not already been used for their default functions.

If >100 ft (30.5 meters) 22 AWG, shielded

RTU Open 33

Page 40

Installation

NOTES

Wiring an occupancy switch or door contact

To wire a compressor safety input to the controller

• An isolation relay may be required if the RTU Open is powered separately from the equipment's control

power circuit.

• Follow device manufacturer's installation and operating instructions.

Occupancy switch - field-supplied

Door contact - field-supplied

Occupancy or door contact switches may be installed to provide an alternate means of occupancy determination or heating and cooling lockout. See Sequence of Operation (page 43) for additional details.

Wiring specifications

Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded

If >100 ft (30.5 meters) 22 AWG, shielded

Maximum length: 500 feet (152 meters)

34 RTU Open

Page 41

NOTES

Fan Status, Filter Status, Remote

Occupancy

Door Contacts

To wire an occupancy switch or door contact

• Binary Inputs 3, 5, 8, and 9 are configurable and may be used for

• Follow device manufacturer's installation and operating instructions.

, or

- provided they have not been utilized for their default functions.

RTU Open 35

Page 42

Start-up

This interface...

Provides a...

i-Vu Open

Field Assistant

Virtual BACview

BACview6 Handheld

BACview6

Start-up

To start up the RTU Open, you need one of the following user interfaces to the controller. These items let you access the controller information, read sensor values, and test the controller.

software Permanent interface

software -

runs on a laptop connected to controller's Local Access port

software -

1, 2

runs on a laptop connected to controller's Local Access port

keypad/display device -

connects to controller's Local Access port

1, 2

keypad/display device

connected to controller's Rnet port

Requires a USB Link (Part #USB-L).

See the BACview Installation and User Guide for instructions on connecting and using the above items.

Temporary interface

Permanent interface

36 RTU Open

Page 43

Service Test

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Configuration > Service Configuration > Service Test HOME > CONFIG > SERVICE > TEST

Service Test

Fire

Safety Chain

Service Test Default Value

Enable

Disable

NOTES

Service Test

Binary Service Test

Default Value

Enable

Disable

Analog Service Test

Default

Value

Service Test

Disable

0.00 Compressor 2 Test

Service Test

Disable

Service Test functions

Fan Test

Supply Fan

Service Test

Default Value

Disable

Compressor 1 Test

Supply Fan

Compressor 1 Test

Enable

Compressor 2 Test

Compressor 1 Test

Enable

Compressor 2 Test

Reversing Valve Test

Dehumidification Test

Heat 1Test

Heat 2Test

BACview:

exhaust fans, economizer, and dehumidification. It is highly recommended to use system start-up and during troubleshooting. See Appendix A: Points/Properties (page

can be used to verify proper operation of compressors, heating stages, indoor fan, power

59) for more

information.

differs from normal operation as follows:

• Outdoor air temperature limits for cooling circuits, economizer, and heating are ignored.

• Normal compressor time guards and other staging delays are ignored.

• Alarm statuses (except

and

) are ignored, but all alarms and alerts are still broadcast on

the network, if applicable.

can be turned on or off from a BACview device, Field Assistant, or the i-Vu application. Select

to turn on and

to turn off.

•

• The output of the

• It is recommended to return every

(unless that test variable must be active to test a subsequent function, as in

• All outputs return to normal operation when

mode is password-protected when accessed from a BACview device.

allows testing of each controller output.

functions are on when the

is controlled by the percentage (0-100%) entered into the

is set to

variable to

is set to

and off when set to

after testing each function

• Use

simultaneously with other

• Use

output will be activated and deactivated in conjunction with this output. Leave

• Use

Compressor 1 output first.

to activate and deactivate the

modes even with its

to activate and deactivate the Compressor 1 (BO - 5) output. The

is required.

to activate and deactivate the Compressor 2 (BO - 4) output. Always test the

(BO - 1) output. Note that this output may enable

output must be set to

set to

for

function.

• Use the

to activate and deactivate the reversing valve (BO - 7) output.

at initial

• Use the

to activate and deactivate the Humidi-MiZer™ (BO - 6) output. The Supply

Fan output will be activated and deactivated in conjunction with the Dehumidification Test output.

• Use

RTU Open 37

to activate and deactivate the Heat 1 (BO - 3) output. The Supply Fan output is activated

and deactivated in conjunction with the

to activate and deactivate the Heat 2 (BO - 2) output. The Supply Fan output is activated

and deactivated in conjunction with the

output.

Page 44

Start-up

Power Exhaust Test

Economizer Test

Analog Output 2 Test

Disable

0.00

Service Test

Disable

Configuring the RTU Open's properties

Unit Configuration properties

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Configuration > Unit Configuration HOME > CONFIG > UNIT

Point Name/Description

Default/Range

Fan Mode

Auto Continuous

Always On

Occupancy Source

Always Occupied BACnet Schedule

BAS On/Off Remote Occ Input

Input 1 Function

• Use

to set the (AO - 1) economizer output to any value from 0 to 100% of configured

to activate and deactivate the power exhaust (BO - 8) output.

output (2-10 Vdc or 4-20 mA).

•

(AO - 2) is currently unused and does not require testing.

• Service Test mode does not timeout. Return all test variables to

or cycle power to the RTU Open to return to normal operation.

To start up the RTU Open, you must configure certain points and properties. Appendix C is a complete list of all the points and properties, with descriptions, defaults, and ranges. These properties affect the unit operation and/or control. Review and understand the meaning and purpose of each property before changing it.

• Unit Configuration properties (page 38)

• Setpoint Configuration properties (page 40)

• Service Configuration properties (page 41)

See Appendix A (page 59) for a complete list of the controller's points/properties.

. Set

BACview:

– The supply fan's operating mode.

Options:

- The fan cycles on/off in conjunction with heating or cooling.

- The fan runs continuously during occupancy & intermittently during

unoccupied periods with heating or cooling.

- The fan runs continuously regardless of occupancy or calls for heating and

cooling.

- The method that the controller uses to determine occupancy.

Options:

= Controller operates continuously as occupied.

= Controller follows a schedule set up in the i-Vu application or Field

Assistant.

= Occupancy is set over the network by another device or a third party BAS.

= Occupancy is set by a remote contact.

– The type of sensor (4-20 mA) connected to terminals J4 – 4, 5, & 6. D:

Continuous

Auto Continuous Always On

Always Occupied

Always Occupied BACnet Schedule BAS On/Off Remote Occ Input

No Sensor

No Sensor IAQ Sensor OAQ Sensor Space RH Sensor

38 RTU Open

Page 45

Point Name/Description

Default/Range

Input 2 Function

Input 3 Function

Input 3 Switch Configuration

No Function Compressor Safety Fan Status Filter Status Remote Occupancy Door Contact

Input 3

Switch Configuration

Input 5 Function

Input 5 Switch Configuration

No Function Fire Shutdown Fan Status Filter Status Remote Occupancy Door Contact

Input 5

Switch Configuration

Input 8 Function

Input 8 Switch Configuration

No Function Enthalpy Switch Fan Status Filter Status Remote Occupancy Door Contact

Input 8

Switch Configuration

Input 9 Function

Input 9 Switch Configuration

No Function Humidistat Fan Status Filter Status Remote Occupancy Door Contact

– The type of sensor (4-20 mA) connected to terminals J4 – 1, 2, & 3. D:

– The usage of Input 3. You must also set

Options:

– The input is not used.

– Proves supply fan operation.

– Indicates a dirty filter.

– Disables mechanical cooling and electric or gas heating, when active.

terminated at Input

– The usage of Input 5. You must also set

Options:

– The input is not used.

– Fire Safety device status. Inhibits operation when tripped.

– Proves supply fan operation.

– Indicates a dirty filter.

– Disables mechanical cooling and electric or gas heating, when active.

terminated at Input

– Safety device status.

– Sets occupancy using a hardware contact.

– The normal (de-energized) state for the set of contacts

– Sets occupancy using a hardware contact.

– The normal (de-energized) state for the set of contacts

No Sensor

No Sensor IAQ Sensor OAQ Sensor Space RH Sensor

Compressor Safety

No Function Compressor Safety Fan Status Filter Status Remote Occupancy Door Contact

NO/NC (normally open/normally closed)

Fire Shutdown

No Function Fire Shutdown Fan Status Filter Status Remote Occupancy Door Contact

NO/NC (normally open/normally closed)

Options:

terminated at Input

Options:

RTU Open 39

– The usage of Input 8. You must also set

– The input is not used.

– Indicates enthalpy status (high or low).

– Proves supply fan operation.

– Indicates a dirty filter.

– Sets occupancy using a hardware contact.

– The normal (de-energized) state for the set of contacts

– The usage of Input 9. You must also set

– The input is not used.

– Indicates high humidity condition.

– Proves supply fan operation.

– Indicates a dirty filter.

– Sets occupancy using a hardware contact.

Enthalpy Switch

No Function Enthalpy Switch Fan Status Filter Status Remote Occupancy Door Contact

NO/NC (normally open/normally closed)

Humidistat

No Function Humidistat Fan Status Filter Status Remote Occupancy Door Contact

Page 46

Start-up

Point Name/Description

Default/Range

Input 9

Switch Configuration

Space sensor type

Setpoint properties

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Configuration > Setpoints HOME > CONFIG > SETPOINT

Heating

Cooling

Point Name/Description

Default/Range

Occupied Heating

Occupied Cooling

Unoccupied Heating

Unoccupied Cooling

– The normal (de-energized) state for the set of contacts

terminated at Input

- The type of local space temperature sensor. D:

BACview:

Select a color band on the setpoint graph to see the current setpoints in the descriptions below.

and

NO/NC (normally open/normally closed)

T55

T55 T56 (Use for T59) SPT Sensor None

fields. See setpoint

– Green

The heating setpoint the controller maintains while in occupied mode.

– Green

The cooling setpoint the controller maintains while in occupied mode.

– Gray

The heating setpoint the controller maintains while in unoccupied mode.

– Gray

The cooling setpoint the controller maintains while in unoccupied mode.

40 RTU Open

70°F

-40 to 245°F

74°F

-40 to 245°F

55°F

45 to 100°F

90°F

-40 to 245°F

Page 47

Point Name/Description

Default/Range

Optimal Start

Occ Relative Humidity Setpoint

Unocc Relative Humidity Setpoint

DCV Max Ctrl Setpoint

Power Exhaust Setpoint

Configuration >Service Configuration

Economizer Exists

Yes

Configuration >Service Configuration > Continuous Occupied Exhaust

Service Configuration properties

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Configuration > Service Configuration HOME > CONFIG > SERVICE

Point Name/Description

Default/Range

Unit Type

Heat/Cool HP O/B Ctrl

HP Y1/W1 Ctrl

Compressor Stages Economizer Exists

Yes

Reversing Valve Output

O = Reversing Valve

B =

Reversing Valve

Heat Type

Number Of Heat Stages

– The number of hours prior to occupancy, at which the Optimal Start function may begin to adjust the effective setpoints to achieve the occupied setpoints by the time scheduled occupancy begins. Enter 0 to disable Optimal Start.

– The percentage of relative humidity in the space during

occupancy that will energize BO - 6 (Humidi-MiZer™).

– The percentage of relative humidity in the space during

the unoccupied time period that starts the unit and energizes BO - 6 (Humidi-MiZer™).

– The design difference between indoor and outdoor CO2 levels. D:

- The outside air damper position at which the controller energizes the Power Exhaust relay. set to be set to

, and

must be

BACview:

must

4 hr

0 to 4 hr

60%rh

0 to Unoccupied RH Control Setpoint

95%

30 to 100%

650ppm

0 to 9999 ppm

50% Open

20 to 90% Open

– The type of equipment that the RTU Open is controlling.

Options:

– Standard rooftop air handling unit.

– Heat Pump application, uses reversing valve output to control heating and

cooling.

– Carrier Heat Pump application only.

economizer damper.

output on with heating.

– The type of heating that the unit has.

– The number of mechanical cooling stages.

– Set to

to enable economizer control for units equipped with an

output on with cooling. Set to

– The number of heat stages.

Heat/Cool

Heat/Cool HP O/B Ctrl HP Y1/W1 Ctrl

One Stage

One Stage Two Stages

No/Yes

R: O O / B

Electric

Electric/Gas

R: 2 1 /2 /0 (no heating)

RTU Open 41

Page 48

Start-up

Point Name/Description

Default/Range

Continuous Occupied Exhaust

Yes

Power Exhaust Setpoint.

Indoor CO2 Sensor Value @min (ma)

Indoor CO2 Sensor Value @max (ma)

The CO2 value that corresponds to a 20mA input at

Outdoor CO2 Sensor Value @min (ma)

Outdoor CO2 Sensor Value @max (ma)

The CO2 value that corresponds to a 20 mA input

– Configures the exhaust fan control strategy (BO-8). If

the power exhaust runs continuously in occupied mode and is off in unoccupied mode. If

, the power exhaust is controlled by the

– The CO2 value that corresponds to a 4mA input at

the appropriate input channel.

–

the appropriate input channel.

– The CO2 value that corresponds to a 4 mA input

at the appropriate input channel.

–

at the appropriate input channel.

No/Yes

0 ppm

0 to 9999 ppm

2000 ppm

0 to 9999 ppm

0 ppm

0 to 9999 ppm

2000 ppm

0 to 9999 ppm

42 RTU Open

Page 49

Occupancy

Occupied/Unoccupied

Occupied

NOTE

Occupancy Source

Always Occupied

BAS On/Off

Remote Occ Input

Unit Configuration

Occupancy Source

Remote Occ Input

Input Switch Configuration

Remote Occupancy

Sequence of Operation

The RTU Open supports various types of constant volume air source configurations:

• Standard heat/cool unit types with up to 2-stages of mechanical cooling and gas or electric heating

• Heat pump units utilizing a reversing valve output for heating and cooling control

• Heat pump unit (Carrier) with an OEM control board

• Economizer, CO2, Demand Limiting, and RH control strategies are available for appropriately equipped

The RTU Open may operate as part of a linked VVT system or as a stand-alone controller.

units

The RTU Open’s operation depends upon its occupancy state ( operates continuously in the

mode until you configure an occupancy schedule.

). The RTU Open

An occupancy schedule may be:

• A local schedule configured in the controller using a BACview device or Field Assistant

• A BACnet schedule configured in the i-Vu application, networked through an i-Vu Open Router

• A BACnet or local schedule configured for subordinate VVT Zones, networked through an i-Vu Open

Router(s) and employing Linkage

To set up occupancy schedules, consult the documentation for your user interface.

A BACnet schedule, downloaded from the i-Vu application will overwrite a local schedule that was set

up with a BACview device or Field Assistant.

Options:

•

- the following settings determine occupancy. See Unit configuration (page 60).

– Controller operates continuously, regardless of any configured schedule

– Occupancy is set over the network by another device or a third party BAS. Refer to the RTU

Open Integration Guide for additional instructions in communication protocols.

•

configured to receive it. You must set one

– Controller monitors an input contact connected to one of the available binary inputs

and

RTU Open 43

Page 50

Sequence of Operation

Supply fan

Fan Modes

Auto

Continuous

Always On

Fan Off Delay

Fire Shutdown Safety chain SAT SPT

Supply Fan Status

Supply Fan Alarm Service Timer

Cooling

Outdoor Air Temperature

Cooling Lockout Temperature

Supply Air Temperature

Space Temperature

Minimum Cooling SAT

Effective

Cooling Setpoint

The RTU Open supply fan may be configured for 1 of 3

•

- The fan cycles on/off in conjunction with heating or cooling

•

with heating or cooling

•

Occupancy can be determined by Linkage, BACnet schedules, BAS schedules, or in response to a remote occupancy switch.

If the following alarms are active, the fan turns off immediately, regardless of the occupancy state or demand:

•

The RTU Open does not include smoke-control functions such as smoke-purge, zone-pressurization, or smokeventilation. Each of these modes require a field-designed circuit to operate the following, as required by local fire codes:

• RTU supply fan

• RTU economizer

• RTU power exhaust

The RTU Open may be configured to accept a operating. When enabled, a loss or lack of fan status will stop heating and cooling operation.

A generate an alarm when the accumulated runtime exceeds the set threshold.

- The fan runs continuously during occupancy and intermittently during unoccupied periods

- The fan runs continuously regardless of occupancy or calls for heating and cooling

allows the supply fan to continue operating after heating or cooling stops.

alarm

alarms

function is available to track the number of supply fan run hours and

input to provide proof the supply fan is

The RTU Open's application and configuration determines the specific cooling sequence. The RTU Open can control up to two stages of cooling with an additional output for a reversing valve (heat pump applications).

The following conditions must be true for the cooling algorithm to operate:

•

• The indoor fan has been on for at least 30 seconds

• The unit has a valid

• Heat mode is not active and the time guard between modes has expired

• Economizer is active and open > 85% with SAT > (

44 RTU Open

+ 0.5°F, or the Economizer is unavailable

is greater than the

input

setpoint

+ 5°F) and SPT >

Page 51

Space Temperature

Effective Occupied Cooling Setpoint

Effective Unoccupied Cooling Setpoint

Minimum Cooling SAT Setpoint

Supply Air Temperature

Minimum Cooling SAT Setpoint

Compressor 2 Service Alarm Timer

Economizer

Outdoor Air Temperature

Space Temperature

Economizer High

OAT Lockout Temp

Supply Air Temperature

Space Temperature

Vent Dmpr Pos / DCV Min

Pos

Vent Dmpr

Pos / DCV Min Pos

Vent Dmpr Pos / DCV Min Pos

Minimum

Cooling SAT

The cooling relays are controlled by the Cooling Control PID Loop and Cooling Stages Capacity algorithm. They calculate the desired number of stages needed to satisfy the space by comparing the

the:

•

when occupied

when unoccupied

When the cooling algorithm preconditions have been met, the compressors are energized in stages, as applicable. Anti-recycle timers are employed to protect the equipment from short-cycling. There are fixed three-minute minimum on-times, and five-minute off-times for each compressor output.

During compressor operation, the RTU Open may reduce the number of active stages if the rooftop supply air temperature falls below the started again after the normal time-guard period has expired, if the above the

. A compressor staged off in this fashion may be

has increased

functions are available (one for each stage of compression). This function tracks the number of compressor run hours and generates an alarm when the accumulated runtime exceeds the threshold set by the adjustable compressor service alarm timers.

The RTU Open provides an analog economizer output for rooftop units with economizer dampers. Economizer dampers may be used to provide indoor air quality control and free cooling when outside air conditions are suitable.

The following conditions must be true for economizer operation:

• The

• The indoor fan has been on for at least 30 seconds

• The unit has a valid

If any of the preceding conditions are not true, the economizer will be set to the

setpoint.

If all preceding conditions are true, the economizer PID loop will modulate the damper from the

The economizer moves to the

setpoint.

(+ 5°F).

is less than the

setpoint

input

setpoint if the SAT falls below the

and less than the

RTU Open 45

Page 52

Sequence of Operation

Power Exhaust

Continuous Occupied Exhaust

Yes

Power Exhaust

Continuous Occupied Exhaust

Power Exhaust

Power Exhaust Setpoint

Unoccupied Free Cooling

Unocc Free Cool Enable

Enable

Economizer High OAT Lockout Temp

Enthalpy

Low

Occupied

Cooling Setpoint

Optimal Start

Optimal Start. Optimal Start

Properties

Equipment

Configuration

Setpoints

Optimal Start

Default Value

0.00

Optimal Start

NOTE

The RTU Open may enable and disable an exhaust fan, based on either the controller’s occupancy or its economizer damper position.

, the

binary output (BO-8) is energized while theRTU

Open is occupied and de-energized when unoccupied.

If economizer damper output exceeds the energized until the economizer output falls below the

is No, the

binary output (BO-8) is energized when the

value (default = 50%). The output remains

value by a fixed hysteresis of

10%.

cooling during unoccupied periods.

The following conditions must be true for unoccupied free cooling to operate:

•

• The system is unoccupied

• The outside air temperature is below the

• The outside air temperature is less than the space temperature

•

When the RTU Open schedule is unoccupied and the space temperature rises at least 1° above the

RTU Open continues to operate in this mode until the space is satisfied or the outside air conditions are no longer suitable for free cooling.

The RTU Open may utilize setpoints by the time scheduled occupancy begins.The Optimal Start recovery period may begin as early as 4 hours prior to occupancy. The algorithm works by moving the unoccupied setpoints toward the occupied setpoints. The rate at which the setpoints move is based on the outside air temperature, design temperatures, and capacities.

The following conditions must be true for optimal start to operate:

• On the

must be set greater than

• The system is unoccupied

If the Open controller does not have a valid outside air temperature, then a constant of 65° F is used.

This value is not adjustable.

allows rooftop equipment with an economizer damper to utilize outdoor air for free

set to

(if enabled) is

setpoint

, the supply fan starts. The economizer damper opens as necessary to cool the space. The

page >

and less than or equal to 4 (

tab >

adjusts the effective setpoints to achieve the occupied

disables

, the

46 RTU Open

Page 53

Optimal Start

Properties

Equipment

Configuration

Setpoints

Enthalpy control

Enthalpy

Enthalpy Status

High

Enthalpy Status

Low

Indoor Air CO2

The actual equation that the controller uses to calculate

is nonlinear. An approximation of the

result is shown below.

To change

settings:

1 In the navigation tree, select the equipment that you want to change. 2 Click

page >

tab >

You may use an enthalpy switch to indicate the suitability of outdoor air for economizer cooling. You can use either an outdoor air or differential enthalpy switch. A differential enthalpy switch has a sensing device in both the outdoor and return air streams. A differential enthalpy switch indicates when outside air is cooler than the return air, and is available for economizer cooling. If no enthalpy switch is configured, a network point (Object Name: oae) is available. This point is displayed in the i-Vu application and a BACview device as (BACnet).

The sequence of operation for economizer cooling is the same with or without an enthalpy switch, except that an enthalpy switch imposes one more validation on the suitability of outside air for economizer cooling. An

position. An preconditions are met.

by installing an air quality (CO2) sensor. A CO2 sensor may be terminated at the RTU Open, or a subordinate zone controller, when part of a zoned system.

An outdoor air quality sensor may also be installed and terminated at the RTU Open, but it is not required. When an outdoor air quality sensor is not installed, the algorithm uses 400ppm as the fixed outdoor air CO2 level.

that is

disables the economizer and the outside air damper goes to its minimum

that is

enables the economizer if a call for cooling exists and the remaining

is controlled on rooftop equipment with an economizer.

sequence is enabled

RTU Open 47

Page 54

Sequence of Operation

Indoor Air CO2

Vent Dmpr Pos / DCV Min Pos

Indoor Air CO2

DCV Max Vent Damper Pos

Heating

Reversing Valve

Outdoor Air Temperature

Heating Lockout Temperature

Supply Air Temperature

Space Temperature

Effective Occupied Heating Setpoint

Effective Unoccupied Heating Setpoint

Supply Air

Temperature

Maximum Heating SAT

Supply Air Temperature

Maximum Heating SAT

The following conditions must be true for the

algorithm to operate:

• The system is occupied

• The supply fan has been started for at least 30 seconds

• The CO2 sensor has a valid reading

As the air quality within the space changes, the minimum position of the economizer damper changes, which allows more or less outdoor air into the space, depending on the relationship of the indoor air CO2 level to the differential setpoint.

The damper position is then compared against the

algorithm calculates a minimum position value using a PID loop. The CO2 minimum

setpoint and the greatest value

becomes the final minimum damper position of the economizer output.

The degree to which the outside air damper may be opened by the

setpoint, which is adjustable between ten and sixty percent (10 – 60%).

algorithm is limited by the

The specific heating sequence is determined by the controller's application and configuration. The RTU Open controls up to two stages of gas or electric heating with an additional output for a

(Heat

Pump applications).

The following conditions must be true for the heating algorithm to operate:

• The

is less than the

setpoint

• The indoor fan has been ON for at least 30 seconds

• The unit has a valid

input

• Neither Cool mode nor economizer are active and the time guard between modes has expired

The heating relays are controlled by the Heating Control PID Loop and Heating Stages Capacity algorithm, which calculate the desired number of stages to satisfy the space by comparing the

the:

•

when occupied

when unoccupied

When the heating algorithm preconditions have been met, the heating is energized in stages. Anti-recycle timers are employed to protect the equipment from short-cycling. There are fixed one minute minimum on and off times for each heating output.

During heating operation, the RTU Open may reduce the number of active stages if the rooftop

started again after the normal time-guard period has expired, if the below the

exceeds the

setpoint. A heat stage turned off in this fashion may be

setpoint.

has decreased

48 RTU Open

Page 55

Heat Pump operation

HP O/B

Y1/W1

HP O/B

(B)

Y1/W1

Dehumidification

Outside Air Temperature

Cooling Lockout Temperature

Indoor Fan

Supply Air Temperature

Space Temperature

Space Relative Humidity Sensor

Humidistat

The RTU Open can control heat pumps

provides a separate output (BO-7) to control a reversing valve. The reversing valve control may be

configured to be energized with a call for heating

The sequence of operations are as previously described for heating and cooling except that the Y1 and outputs are compressor outputs, energizing mechanical heating or cooling, depending on the state of the reversing valve.

Selection sequences of operations are as described for Heating (page output is not utilized in this application. available.

The RTU Open provides occupied and unoccupied dehumidification on units that are equipped with the Carrier Humidi-MiZer™ option from the factory. This requires a space relative humidity sensor or a humidistat for control.

The following conditions must be true for the dehumidification control to operate:

• The

and

, or energized with a call for cooling (O).

and W2 are used for auxiliary heat. Up to two stages are available.

is for heat pumps that do not require a O terminal to energize the reversing valve. The

48) and Cooling (page 44). The reversing valve

and W2 are used for auxiliary heat. Up to two stages are

is greater than the

setpoint

• The

• The unit has a valid

has been ON for at least 30 seconds

input

• Heat mode is not active and the time guard between modes has expired

Dehumidification alone will not enable the unit. The unit must be running (Fan On), while occupied or unoccupied, for Dehumidification to become active. When using a relative humidity sensor to control dehumidification, occupied and unoccupied dehumidification setpoints are used.

When using a humidistat, the setpoints are not used. The humidistat indicates a high-humidity condition.

When a high indoor relative humidity condition is indicated and the above conditions are satisfied, the RTU Open enters the dehumidification mode, energizing the Humidi-MiZer™ output.

The mode continues until the space relative humidity falls below the active setpoint by a 5% fixed Hysteresis when a humidity sensor is used, or when there is no longer a call for dehumidification where a humidistat is used.

See the base unit / Humidi-MiZer™ operations manual for additional information.

RTU Open 49

Page 56

Sequence of Operation

Demand Limiting

Demand Level Setpoints

Demand Level

Demand 1

Demand 2

Demand 3

Demand Limit

Level 0

Door contact

Door Contact

Remote occupancy

Remote Occupancy

Occupancy Source

Remote Occ Input

Remote Occupancy

Fire Shutdown

Compressor Safety

Compressor Safety Alarm

Properties

Equipment

Alarms

The RTU Open may employ a demand limit strategy. Demand limiting in the RTU Open works through setpoint expansion. The controller’s heating and cooling setpoints are expanded in steps or levels. The degree to which the setpoints are expanded is defined by the

Each yields a 1° expansion,

The BACnet

leaves the standard occupied and unoccupied heating and cooling setpoints in effect. Levels 1

(1 through 3) adjusts the heating and cooling setpoints outwards. By default,

yields a 2° expansion, and

variable sets the desired level of setpoint expansion in the receiving controller.

yields a 4° expansion.

through 3 expands occupied heating and cooling setpoints.

A mounted within the space served by a single zone rooftop. electric or gas heating, when active. Economizer cooling, if available, continues to operate.

may be configured on any unused binary input. A typical application is an occupancy sensor

disables mechanical cooling and

contact, controlled by a third party, to set the controller's occupied mode. The requires both an input configured for operate.

Once configured, the controller will operate in the occupied or unoccupied mode, as determined by the state of the

shutdown contact, which, when active, immediately shuts down equipment operation.

may be configured on Binary Input 5. A typical application involves a smoke detector or fire

available on most Carrier rooftop equipment.

A equipment requires attention.

Cooling, heating, and supply fan outputs are not interrupted except where the RTU Open is configured for Heat Pump operation. When configured for Heat Pump, and in the heating mode, a compressor safety fault will cause the available stages of electric heating to be enabled in place of mechanical heating.

Normal operation resumes when the compressor safety circuit is de-energized.

may be configured on any unused binary input channel. A typical application is a remote

, and

set to

function

input.

may be configured on Binary Input 3. A compressor safety tripped indicator circuit is

is shown on

page >

tab >

and indicates that the

50 RTU Open

Page 57

Fan Status

Filter status

Filter

Dirty

Alarms

NOTE

Alarms

Properties

Equipment

Alarms

Safety Chain

Fire Shutdown

Compressor Safety

switch, current sensing relay, or other device that provides a supply fan running verification.

Enabling this function displays the supply fan’s status on the equipment graphic.

If the controller loses fan status during operation, heating and cooling are disabled, the economizer damper (if available) is closed, and an alarm for loss of status is indicated.

If the fan status is on when the controller is commanding the fan off, the unit remains in the off state. An alarm is generated indicating that the fan is running when it should be off.

pressure switch that senses the pressure drop across a filter bank.

When the pressure across the filter bank exceeds the setpoint of the differential pressure switch, the status is displayed as

may be configured on any unused binary input channel. A typical application would be an airflow

status may be configured on any unused binary input channel. A typical application is a differential

on the controller graphic. An alarm indicates a dirty filter.

Some of the

tab >

functions described in this section will only be visible on the

when the appropriate inputs are configured. Alarms are not initiated when the input

page >

is not configured.

Examples: Low or High Temperature Cutouts (Freezestat / Firestat). See To wire inputs and outputs (page

- You may use the RTU Open's safety chain circuit to shut down the unit for a safety condition.

14) for additional wiring instructions. This alarm indicates the safety chain circuit (Input 4) is open. Cooling, heating, and supply fan operation stop after appropriate time guards. Normal operation resumes when the safety chain circuit is complete.

– You may configure the RTU Open to accept a

contact on Input 5. Examples: Smoke detectors or fire shutdown relays. This alarm indicates this device (Input 5) has tripped. Cooling, heating, and supply fan operation immediately stop. Reset fire shutdown contact to resume normal operation.

– You may configure the RTU Open to monitor the base unit’s compressor safety circuit. This alarm indicates the base unit's compressor safety circuit is energized. Cooling, heating, and supply fan outputs are not interrupted except when the RTU Open is configured for Heat Pump. Normal operation resumes when the compressor safety circuit is de-energized.

If the Heat Pump is in the heating mode, it will automatically replace the compressor stage(s) with the equivalent number of auxiliary heat stages, as available.

• If it's a Carrier Heat Pump, there is only one auxiliary heat stage output and the staging is done by the

machine itself, if it's two-stage gas or electric.

• For a non-Carrier Heat Pump, when configured for two stages of aux heat and two compressors,

Compressor 1 is replaced by Aux Heat Stage 1 and Compressor 2 is replaced by Aux Heat Stage 2.

The compressor output stays on when the safety alarm is present. For cooling, the alarm indicates the compressors are down. See Heat Pump operation (page 49) for further information.

RTU Open 51

Page 58

Sequence of Operation

Space Temp Sensor

Supply Air Temp Sensor

Outdoor Air Temp Sensor Alarm

Space Relative Humidity Sensor

IAQ Sensor

OAQ Sensor

Space Temperature

Occupied -

Low Space Temperature

High Space Temperature

Unoccupied

Alarm Configuration

Unoccupied Low SPT Alarm Limit

Alarm Configuration

Unoccupied High SPT Alarm Limit

Space Temperature

Alarming Temperature

Alarm Limit Exceeded

High Supply Air Temperature

Alarm Configuration

High SAT Alarm Limit

Low Supply Air Temperature

Alarm Configuration

Low SAT Alarm Limit

Setpoint Slider

Configuration

Unit Configuration

Input Configuration

Space sensor type

Unit Configuration

Setpoint Adjustment Range

Switch Configuration

Unit Configuration

Input

Functions 3, 5, 8,

Analog Input Configuration

Unit Configuration

Input

Functions 1

– This alarm indicates an invalid sensor condition in a physically connected space temperature sensor (SPT Sensor/T5*). Cooling, heating, and supply fan operation stop after the appropriate time guards. Normal operation resumes when the controller detects a valid sensor.

– This alarm indicates a shorted or open circuit in the SAT input. Cooling, heating, and supply fan operation stops after the appropriate time guards. Normal operation resumes when the controller detects a valid sensor.

- This alarm indicates a shorted or open circuit in the OAT input. Cooling, heating, and supply fan operation continues. OAT lockouts will not operate while the sensor is in alarm. Normal operation resumes when the controller detects a valid sensor.

- This alarm indicates if the mA input at the associated channel falls below

3.5 mA or rises above 21 mA. Cooling, heating, and supply fan operation continues, however, the controller’s Humidi-MiZer™ binary output is disabled until the fault condition is corrected.

- The RTU Open generates an

alarm if the mA input at the associated channel falls below 3.5 mA or rises above 21 mA. Cooling, heating, and supply fan operation continues. However, the controller’s IAQ control function is disabled until the fault condition is corrected.

- The RTU Open generates an

alarm if the mA input at the associated channel falls below 3.5 mA or rises above 21 mA. Cooling, heating, and supply fan operation continues. However, the controller’s IAQ control function uses 400ppm as the fixed outdoor air CO2 level until the fault condition is corrected.

•

below the lower limit of the blue color bar. A

–

The RTU Open generates a

alarm if the space temperature falls

alarm is generated if the space

temperature rises above the upper limit of the orange color bar.

•

below the temperature alarm is generated when the space temperature rises above the

The following values are related to the

•

An unoccupied low space temperature alarm is generated when the space temperature falls

. An unoccupied high space

alarm:

– This variable displays the value of the space temperature that is in alarm and is

only visible when the space temperature is in an alarm state.

•

– This variable displays the value of the alarm setpoint that is exceeded by the

alarming space temperature and is only visible when the space temperature is in an alarm state.

the

– The RTU Open generates this alarm when the supply air temperature exceeds

setpoint for 5 minutes. This alarm is inhibited until the RTU

has been running for 30 minutes to allow for system stabilization after startup.

below the

- The RTU Open generates this alarm when the supply air temperature falls >

setpoint for 5 minutes. This alarm is inhibited until the

RTU has been running for 30 minutes to allow for system stabilization after startup.

RTU Open

– The RTU Open generates this alarm when an open circuit is detected at Input 11 and the

is set to T56. Note that only an open circuit results in an alarm. A short across this input offsets the setpoints negatively by the amount configured in the

or 9 are configured identically. Neither input may work reliably and downstream control may

- The RTU Open generates this alarm when any two of the

be affected, depending on the function duplicated. The alarm clears and normal control is restored when the input function duplication is corrected.

and 2 are configured identically. Neither input may work reliably and downstream control may be

- The RTU Open generates this alarm when the

affected, depending on the function duplicated. The alarm clears and normal control is restored when the input function duplication is corrected.

52 RTU Open

Page 59

High Space Relative Humidity Alarm Configuration > High Space Humidity Alarm Limit

Low Space Relative Humidity Alarm Configuration

Low Space Humidity Alarm Limit

High CO2

Alarm Configuration

Occupied High CO2 Alarm Limit

Supply Fan Runtime

Unit

Configuration

Supply Fan Service Alarm Timer

Maintenance

Reset Supply Fan Runtime Alarm

Clear

Run

Unit Configuration

Supply

Fan Service Timer

Compressor 1 Runtime Unit Configuration

Compressor 1 Service Alarm Timer

Compressor 1 Runtime

Maintenance

Reset Comp 1 Runtime Alarm

Clear

Run

Unit

Configuration

Compressor 1 Service Timer

Compressor 1 Runtime

Compressor 2 Runtime Unit Configuration

Compressor 2 Service Alarm Time

Maintenance

Reset Comp 2 Runtime Alarm

Clear

Run

Unit

Configuration

Compressor 2 Service Timer

Service Configuration

Compressor States

Two

Stages

Filter

Unit Configuration

Filter Service Alarm Timer

Maintenance

Reset Filter

Runtime Alarm

Off

Unit Configuration

Filter Service Alarm Timer

Airside Linkage Alarm

Linkage

- The RTU Open generates this alarm when the space humidity exceeds the setpoint for 10 minutes. This alarm is inhibited until

the RTU runs for 15 minutes to allow for system stabilization after startup.

- The RTU Open generates this alarm when the space humidity falls below the setpoint for 5 minutes. This alarm is inhibited until

the RTU runs for 5 minutes to allow for system stabilization after startup.

- The RTU Open generates this alarm when the space CO2 level exceeds the setpoint for 1-minute. This alarm will be inhibited until the RTU has been

running for 2-minutes to allow for system stabilization after startup.

- The RTU Open generates a this alarm when the accumulated runtime exceeds the

value (when not set to 0). This alarm is most commonly used to indicate an equipment maintenance interval is due. The supply fan runtime accumulator may be reset by setting the acknowledging each selection by clicking the

commonly used to indicate an equipment maintenance interval is due. The accumulator may be reset by setting the back to

button when it appears. Setting

, and then back to

value to 0 disables the supply fan runtime alarm function.

- The RTU Open generates this alarm when the accumulated runtime exceeds the

value (when not set to 0). This alarm is most

– acknowledging each selection by clicking the OK button when it appears. Setting

value to 0 disables the

- The RTU Open generates this alarm when the accumulated runtime exceeds the

r value (when not set to 0). This alarm is most

–

, and then

alarm function.

commonly used to indicate an equipment maintenance interval is due. The Compressor 2 runtime accumulator may be reset by setting the back to

– acknowledging each selection by clicking the OK button when it appears. Setting

Note that this function is unavailable if the

- The RTU Open generates this alarm when the accumulated runtime exceeds the value (when not set to 0). This alarm is most commonly used to indicate a filter

replacement is due. Reset the filter service runtime accumulator by setting the

to On, back to

value to 0 disables the filter service alarm function.

- An RTU Open may act as an air source in a zoned system. Carrier systems utilize a

value to 0 disables the Compressor 2 runtime alarm function.

, and clicking the OK button after each setting. Setting

, and then

value is not set to

function called Linkage™ to pass data between a master zone and its air source via an MS/TP network connection. When the RTU Open is part of a linked system, it will indicate an airside linkage alarm if it loses communications with its linkage master or if it receives invalid data.

The RTU Open may serve as an air source to an Open Variable Volume Terminal (VVT) system. When the RTU Open is part of a VVT system and the controllers are wired together to form a network, the controllers may use a method of communication known as Linkage™. Linkage is a method by which an air source and its subordinate zone terminals exchange data to form a coordinated HVAC system. The system's air source controller, zone controllers, and bypass controller are linked so that their data exchange can be managed by one zone controller configured as the VVT Master.

The VVT Master gathers the following information from the slave zone controllers:

• occupancy status

• setpoints

RTU Open 53

Page 60

Sequence of Operation

NOTE

Linkage

Callers

Linkage Callers

• zone temperature

• relative humidity

• CO

level

• damper position

• optimal start data

The VVT Master performs mathematical calculations and algorithms on the data and then sends the composite information to the air source. The VVT Master receives information from the air source such as mode, supply air temperature, and outside air temperature, and passes that information to all linked controllers.

The following paragraphs describe the interaction between the air source (RTU Open) and its subordinate zones. Additional information regarding Open Zoned Systems may be found in the VVT Zone and VVT Bypass Controller Installation Guides.

The VVT Master determines system operation by prioritizing heating and cooling requirements from all the zones based on their occupancy and demand. The VVT Master scans the system continuously to determine if any zones are occupied. Occupied zones are a higher priority than unoccupied zones. The VVT Master evaluates all the occupied zones' heating or cooling demands and sends a request to the air source (RTU Open) for:

• Cooling, if the number of occupied zones with cooling demands exceeds the number of occupied zones

with heating demands, and the demand is greater than or equal to the number of configured

• Heating, if the number of occupied zones with a heating demand exceeds or is equal to the number of

If no zones are occupied or no occupied zones require heating or cooling, the VVT Master performs the evaluation described above for the unoccupied zones.

The VVT Master then gathers the following information and sends it to the air source (RTU Open):

• The system mode

• The setpoints and zone temperature from the zone with the greatest demand for the requested air

source mode (heating or cooling). (This zone is called the reference zone.)

• The system occupancy status

• Most open damper position from any zone

• RH and CO2 values (if applicable)

The air source responds by sending the air source mode, supply air temperature, and outside air temperature. The air source verifies the mode by comparing its supply air temperature to the space temperature received through Linkage. See the air source documentation for operation and parameters used to verify its mode. This verification allows the VVT system to determine if the desired air source mode is actually being provided. For example, if the VVT Master sends a request for heating and the air source does not have heat or it’s heat has failed, the air source's actual mode indicates that and it's current mode is sent to the zones so that they can control accordingly.

The system remains in that mode until all zones of that demand are satisfied or until a fixed 30 minute mode reselect timer causes a forced re-evaluation of the system. If there is no demand for the opposite mode, the reselect timer starts again and the current mode continues until all zones are satisfied or until the reselect timer expires, repeating the process. If there is a demand for the opposite mode, the VVT Master sends the reference zone's space temperature and setpoints to the air source and restarts the reselect timer. The air source re-evaluates its demand based on the new information and goes to the Vent mode until the new mode can be verified as described above. The amount of time this takes is determined by the air source’s operating parameters.

The VVT Master continuously evaluates the system and updates the air source with the most current system demand. Based on the evaluation, the reference zone can change from one zone to another. The evaluation process continues until there is no demand from any zone or the 30 minute timer causes a re-evaluation of the system conditions.

54 RTU Open

Page 61

Linkage Air Source Modes

Supply Air Temperature

Off

Fan Only

Economizer Cooling

Cooling

Heating

Dehumidification

Test

Service Test

Shutdown

Unocc Free Cooling

If no heating or cooling is required or the current air source mode is satisfied, the VVT Master calculates the weighted average of the occupied and unoccupied heating and cooling setpoints. It also calculates a zone temperature that is midway between the setpoints (occupied or unoccupied based on the system’s current occupancy status). This information, plus the occupancy status, is sent to the air source so that its current mode is disabled and the unit ceases heating or cooling operation. If the system is occupied, the air source fan and OA damper, if applicable, operate to maintain proper ventilation.

In a linked system, the air source determines its operating mode and qualifies that mode based on its own

configuration:

•

– Air source fan is off

•

– Air source fan is on and providing ventilation (neutral SAT) without heating or cooling

– Air source fan is on and cooling is provided by economizer and mechanical cooling

(SAT). The following modes can be sent by the air source depending on its

– Air source fan is on and providing cooling, using economizer only

•

– Air source fan is on and heating is provided (gas or electric)

– The RTU Open

– Air source fan is on and Humidi-MiZer™ is active

mode is active

– Air source fan is off due to Safety Chain, Fire Shutdown, or invalid SAT sensor

– Air source fan is on, with the economizer providing cooling while unoccupied

RTU Open 55

Page 62

Troubleshooting

Serial number

LED's

If this LED is on...

Status is...

Power

DO#

Run

Error

If Run LED shows...

And Error LED shows...

Status is..

Run

Troubleshooting

If you have problems mounting, wiring, or addressing the RTU Open, contact Carrier Control Systems Support.

If you need the RTU Open's serial number when troubleshooting, the number is on:

• a sticker on the back of the main controller board

• a Module Status report (modstat) from your user interface

The LED's on the RTU Open show the status of certain functions.

The RTU Open has power

The RTU Open is receiving data from the network segment

The RTU Open is transmitting data over the network segment

The binary output is active

The

and

LED's indicate controller and network status.

2 flashes per second Off Normal

2 flashes per second 2 flashes,

alternating with

2 flashes per second 3 flashes, then off The controller has just been

2 flashes per second On Exec halted after frequent system

5 flashes per second Off Firmware transfer in progress,

LED

Five minute auto-restart delay after system error

formatted

errors or control programs halted

Boot is running

56 RTU Open

Page 63

If Run LED shows...

And Error LED shows...

Status is..

Run

Replacing the RTU Open's battery

CAUTION

7 flashes per second 7 flashes per second,

alternating with

14 flashes per second 14 flashes per second,

alternating with

On On Failure. Try the following solutions:

*Formatting the controller may result in lost information and should only be done under the guidance of Carrier Control Systems Support.

LED

Ten second recovery period after brownout

Brownout

• Turn the RTU Open off, then

on.

• Format the RTU Open.*

• Download memory to the RTU

Open.

• Replace the RTU Open.

The RTU Open's 10-year Lithium CR2032 battery provides a minimum of 10,000 hours of data retention during power outages.

Power must be ON to the RTU Open when replacing the battery, or your date, time, and trend data

will be lost.

1 Remove the battery from the controller, making note of the battery's polarity. 2 Insert the new battery, matching the battery's polarity with the polarity indicated on the RTU Open.

RTU Open 57

Page 64

Compliance

FCC Compliance

CAUTION

CE Compliance

WARNING

BACnet Compliance

Compliance

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

could void the user’s authority to operate the equipment.

Changes or modifications not expressly approved by the responsible party for compliance

This is a Class A product. In a domestic environment, this product may cause radio

interference in which case the user may be required to take adequate measures.

BACnet® is a registered trademark of ASHRAE. ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards. Compliance of listed products to requirements of ASHRAE Standard 135 is the responsibility of the BACnet manufacturers Association (BMA). BTL BMA.

is a registered trademark of the

58 RTU Open

Page 65

NOTE

Status

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Status HOME > STATUS

Point Name/Description

Range

System Mode

Operating Mode

Supply Fan Status

Fan Status

Space Temperature - Prime Variable Supply Air Temperature

Outdoor Air Temperature

Space Relative Humidity

Configuration > Unit

Configuration

Input 1

Function

Space RH Sensor

Indoor Air CO2

Configuration >Unit

Configuration > Input 1

Function

IAQ Sensor

Outdoor Air CO2

Configuration >Unit

Configuration >Input 1

Function

OAQ Sensor

Economizer Output

Appendix A: RTU Open Points/Properties

Engineering units shown in this document in the defaults and ranges are strictly for reference. You must enter an integer only.

BACview:

– The controller's current operating status. R: Disabled

– The controller's current operating mode. R: Off

– The current fan status if an input is configured for

control.

– The current indoor air CO2 concentration if the

– The current outdoor air CO2 concentration if the

– The current economizer output with respect to the outdoor air

damper (if equipped).

Test Run

Fan Only Economizer Cooling Heating Dehumidification Test Shutdown Unocc Free Cooling (NTFC)

. R: Off/Running

– The space temperature value currently used for

– Displays the current supply air temperature. R: -56 to 245°F

– The outdoor air temperature value used for control. R: -56 to 245°F

– The current space relative humidity if

(or 2)

is set to

R: -56 to 245°F

R: 0 to 100%rh

R: 0 to 5000ppm

R: 0 to 100% Open

RTU Open 59

Page 66

Appendix A: RTU Open Points/Properties

Unit Configuration

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Configuration > Unit Configuration HOME > CONFIG > UNIT

Point Name/Description

Default/Range

Fan Mode

Auto Continuous

Always On

Unit Start Delay Fan Off Delay

Minimum Cooling SAT

Maximum Heating SAT

Vent Dmpr Pos / DCV Min Pos

DCV Max Vent Damper Pos

Supply Fan Service Alarm Timer

Compressor 1 Service Alarm Timer

Compressor 2 Service Alarm Timer

Filter Service Alarm Timer Filter Alarm

Pushbutton Override

Cooling Lockout Temp

Economizer High OAT Lockout

BACview:

– The supply fan's operating mode.

Options:

- The fan cycles on/off in conjunction with heating or cooling.

- The fan runs continuously during occupancy & intermittently during

unoccupied periods with heating or cooling.

- The fan runs continuously regardless of occupancy or calls for heating and

cooling.

– How long the controller delays normal operation after power is restored. Typically used to prevent excessive demand when recovering from a power failure.

– How long the supply fan runs after receiving a valid stop command. D:

– In cooling mode, the cooling outputs are controlled so that the

supply air temperature does not drop below this value.

– In heating mode, the heating outputs are controlled so the

supply air temperature does not rise above this value.

– The minimum outdoor air damper position maintained

during occupied periods.

– The maximum outdoor air damper position allowed while

DCV is active.

– A Supply Fan Runtime alarm is generated when the

supply fan run hours exceed this value. Set to 0 to disable.

– A Compressor 1 Runtime alarm is generated when

the compressor 1 run hours exceed this value. Set to 0 to disable.

– A Compressor 2 Runtime alarm is generated when

the compressor 2 run hours exceed this value. Set to 0 to disable.

Continuous

Auto Continuous Always On

5 sec

0 to 30 sec

90 seconds

0 to 180 seconds

50°F

45 to 75°F

120°F

85 to 150°F

50% Open

0 to 100% Open

50% Open

10 to 60% Open

600 hr

0 to 9999 hr

0 hr

0 to 9999 hr

0 hr

0 to 9999 hr

– The amount of time the fan will run before generating a

. Set to 0 to disable the alarm and reset accumulated fan hours.

– Enables or disables the use of a pushbutton override from a local

space temperature sensor.

– The outdoor air temperature at which cooling is inhibited. D:

– The outdoor air temperature at which economizer

cooling is inhibited.

60 RTU Open

600 hr

0 to 9999 hr

Enable

Disable/Enable

45°F

0 to 80°F

75°F

55 to 80°F

Page 67

Point Name/Description

Default/Range

HP Rev Cycle Lockout Temp

Heating Lockout Temperature

Unocc Free Cool Enable

Occupancy Source

Always Occupied BACnet Schedule

BAS On/Off Remote Occ Input

Input Configuration

Input 1 Function

Input 2 Function

Input 3 Function

Input 3 Switch Configuration

No Function Compressor Safety Fan Status Filter Status Remote Occupancy Door Contact

Input 3 Switch Configuration

Input 5 Function

Input 5 Switch Configuration

No Function Fire Shutdown Fan Status Filter Status Remote Occupancy Door Contact

– The outdoor air temperature at which reverse cycle

heating is locked out. Requires that the unit is configured as a Heat Pump.

– The outdoor air temperature at which heating is

inhibited.

– Enable to allow the unit to use economizer to provide

unoccupied free cooling (NTFC).

- The method that the controller uses to determine occupancy.

Options:

= Controller operates continuously as occupied.

= Controller follows a schedule set up in the i-Vu application or Field

Assistant.

= Occupancy is set over the network by another device or a third party BAS.

= Occupancy is set by a remote contact.

– The type of sensor (4-20 mA) connected to terminals J4 – 4, 5, & 6. D:

– The type of sensor (4-20 mA) connected to terminals J4 – 1, 2, & 3. D:

– The usage of Input 3. You must also set

Options:

– The input is not used.

– Safety device status.

– Proves supply fan operation.

– Indicates a dirty filter.

– Sets occupancy using a hardware contact.

– Disables mechanical cooling and electric or gas heating, when active.

-3°F

-20 to 30°F

65°F

35 to 150°F

Disable

Disable/Enable

Always Occupied

Always Occupied BACnet Schedule BAS On/Off Remote Occ Input

No Sensor

No Sensor IAQ Sensor OAQ Sensor Space RH Sensor

No Sensor

No Sensor IAQ Sensor OAQ Sensor Space RH Sensor

Compressor Safety

No Function Compressor Safety Fan Status Filter Status Remote Occupancy Door Contact

terminated at Input

Options:

RTU Open 61

– The normal (de-energized) state for the set of contacts

– The usage of Input 5. You must also set

– The input is not used.

– Fire Safety device status. Inhibits operation when tripped.

– Proves supply fan operation.

– Indicates a dirty filter.

– Sets occupancy using a hardware contact.

– Disables mechanical cooling and electric or gas heating, when active.

NO/NC (normally open/normally closed)

Fire Shutdown

No Function Fire Shutdown Fan Status Filter Status Remote Occupancy Door Contact

Page 68

Appendix A: RTU Open Points/Properties

Point Name/Description

Default/Range

Input 5 Switch Configuration

Input 8 Function

Input 8 Switch Configuration

No Function Enthalpy Switch Fan Status Filter Status Remote Occupancy Door Contact

Input 8 Switch Configuration

Input 9 Function

Input 9 Switch Configuration

No Function Humidistat Fan Status Filter Status Remote Occupancy Door Contact

Input 9 Switch Configuration

Space sensor type

T5x Override Duration

Sensor Calibration

Space Temp Calibration

A calibration offset value to allow the local space temperature

Supply Air Temp Calibration

Outside Air Temp Calibration

terminated at Input

– The usage of Input 8. You must also set

Options:

– The input is not used.

– Indicates enthalpy status (high or low).

– Proves supply fan operation.

– Indicates a dirty filter.

– Sets occupancy using a hardware contact.

terminated at Input

– The usage of Input 9. You must also set

Options:

– The input is not used.

– Indicates high humidity condition.

– Proves supply fan operation.

– Indicates a dirty filter.

– Sets occupancy using a hardware contact.

terminated at Input

– The normal (de-energized) state for the set of contacts

– Sets occupancy using a hardware contact.

– The normal (de-energized) state for the set of contacts

– Sets occupancy using a hardware contact.

– The normal (de-energized) state for the set of contacts

NO/NC (normally open/normally closed)

Enthalpy Switch

No Function Enthalpy Switch Fan Status Filter Status Remote Occupancy Door Contact

NO/NC (normally open/normally closed)

Humidistat

No Function Humidistat Fan Status Filter Status Remote Occupancy Door Contact

NO/NC (normally open/normally closed)

- The type of local space temperature sensor. D:

– If using a T55, T56, or T59 sensor, this is the amount of time that the controller runs in the occupied mode when a user presses the sensor's override button for 1 to 10 seconds.

– sensor to be adjusted to match a calibrated standard measuring the temperature in the same location.

– A calibration offset value to allow the supply air temperature sensor to be adjusted to match a calibrated standard measuring the temperature in the same location.

– A calibration offset value to allow the outside air temperature sensor to be adjusted to match a calibrated standard measuring the temperature in the same location.

T55

T55 T56 (Use for T59) SPT Sensor None

1 hr

0 to 24 hours

0°F

-9.9 to 10°F

0°F

-9.9 to 10°F

0°F

-9.9 to 10°F

62 RTU Open

Page 69

Setpoints

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Configuration > Setpoints HOME > CONFIG > SETPOINT

Heating

Cooling

Occupied Setpoints

Default Demand Level

Point Name/Description

Occupied

Occupied Heating

Occupied Cooling

Occupied Heating 1

Occupied Heating

Occupied Heating 1

Occupied Heating

BACview:

Select a color band on the setpoint graph to see the current setpoints in the descriptions below.

and

fields. See setpoint

The occupied setpoints described below are the setpoints under normal operating conditions. The Demand Level 1–3 setpoints apply if demand limiting is used.

Demand limiting is a cost-saving strategy to reduce energy consumption. The strategy expands the occupied heating and cooling setpoints when the system reaches one of 3 levels of consumption. With the expanded setpoints, the equipment works less, thereby saving energy. By default, Demand Level 1 expands the occupied heating and cooling setpoints by 1°F, Demand Level 2 by 2°F, and Demand Level 3 by 4°F. If the occupied heating or cooling setpoints change, the (effective) demand level setpoints automatically change by the same amount. See Sequence of Operation (page 43) for more information.

Range: -40 to 245°F

– Green

The heating setpoint the controller maintains while in occupied mode.

– Green

The cooling setpoint the controller maintains while in occupied mode.

– Light Blue The space temperature must be less than the VVT Master to consider the zone a heating caller in a linked system. In a singlezone application, the heating requirement begins as soon as the space temperature falls below the

value be set no less than 0.5°F below the setpoint.

setpoint. We recommend that the

setpoint for the

70°F 69°F 68°F 66°F

74°F 75°F 76°F 78°F

69°F 68°F 67°F 65°F

RTU Open 63

Page 70

Appendix A: RTU Open Points/Properties

Default Demand Level

Point Name/Description

Occupied

Occupied Heating 2

Occupied Heating 1

Occupied Cooling 1

Occupied Cooling

Occupied Cooling 1

Occupied Cooling

Occupied Cooling 2

Occupied Cooling 1

Unoccupied Setpoints

Point Name/Description

Default/Range

Unoccupied Heating

Unoccupied Cooling

Unoccupied Heating 1

application, the unoccupied heating requirement begins as soon as the space temperature falls

Unoccupied Heating

Unoccupied Heating 1

Unoccupied Heating

Unoccupied Heating 2

Unoccupied Heating 1

Unoccupied Cooling 1

Unoccupied Cooling

Unoccupied Cooling 1

Unoccupied Cooling

Unoccupied Cooling 2

Unoccupied Cooling 1

Range: -40 to 245°F

– Dark Blue The space temperature must be less than the generate a low space temperature alarm. We recommend that this value be set no less than 0.5°F below the

– Yellow The space temperature must be greater than the the VVT Master to consider the zone a cooling caller in a linked system. In a singlezone application, the cooling requirement begins as soon as the space temperature exceeds the

value be set no less than 0.5°F above the setpoint.

– Orange The space temperature must be greater than the generate a high space temperature alarm. We recommend that this value be set no less than 0.5°F above the

setpoint.

setpoint. We recommend that the

setpoint.

setpoint to

setpoint for

setpoint to

68°F 67°F 66°F 64°F

75°F 76°F 77°F 79°F

76°F 78°F 78°F 81°F

– Gray

The heating setpoint the controller maintains while in unoccupied mode.

– Gray

The cooling setpoint the controller maintains while in unoccupied mode.

– Light Blue The space temperature must be less than the Master to consider the zone an unoccupied heating caller in a linked system. In a single-zone

setpoint for the VVT

55°F

45 to 100°F

90°F

-40 to 245°F

54°F

-40 to 245°F

below the be set no less than 0.5°F below the

– Dark Blue The space temperature must be less than the unoccupied low space temperature alarm. We recommend that this value be set no less than

0.5°F below the

– Yellow The space temperature must be greater than the Master to consider the zone an unoccupied cooling caller in a linked system. In a single-zone application, the unoccupied cooling requirement begins as soon as the space temperature exceeds the be set no less than 0.5°F above the

– Orange The space temperature must be greater than the unoccupied high space temperature alarm. We recommend that this value be set no less than

0.5°F above the

setpoint. We recommend that the

setpoint.

setpoint to generate an

setpoint.

setpoint for the VVT

setpoint. We recommend that the

setpoint.

setpoint to generate an

setpoint.

64 RTU Open

value

52°F

-40 to 245°F

91°F

-40 to 245°F

93°F

-40 to 245°F

Page 71

Point Name/Description

Default/Range

Heating Capacity

Heating Design Temp

Cooling Capacity

Cooling Design Temp

Hysteresis

Time

Temp

Occupied heating setpoint: 70°

75.5°

70.5°

Occupied cooling setpoint: 76°

.5° hysteresis

– Used for Optimal Start, this is the rate at which the zone temperature changes when the heating system runs at full capacity to maintain designed occupied heating setpoint.

– The geographically-based outdoor air temperature at which the heating system must run constantly to maintain comfort. This information is available in ASHRAE publications and most design references.

– Used for Optimal Start, this is the rate at which the zone temperature changes when cooling system runs at full capacity to maintain designed occupied cooling setpoint.

– The geographically-based outdoor air temperature at which the cooling system must run constantly to maintain comfort. This information is available in ASHRAE publications and most design references.

– The desired difference between the temperature at which the zone color changes as the zone temperature departs from the acceptable range between the heating and cooling setpoints (green) into the Cooling 1 (yellow) or Heating 1 (light blue) and the temperature at which the zone color changes back to the acceptable range between the heating and cooling setpoints.

For example, the following graph shows the zone color that results as the zone temperature departs from and returns to the acceptable range in a zone with the following settings:

• Color Change Hysteresis = .5° (applies as the temperature returns to the acceptable

range)

• Occupied cooling setpoint = 76°

• Occupied heating setpoint = 70°

5°F/hr

0 to 120°F/hr

0°F

-100 to 150°F

5°F/hr

0 to 140°F/hr

100°F

-100 to 150°F

0.5°F

0 to 120°F

RTU Open 65

Page 72

Appendix A: RTU Open Points/Properties

Effective Setpoints

Point Name/Description

Default/Range

Heating –

Heating

Cooling –

Cooling

Optimal Start

Occ Relative Humidity Setpoint

Unocc Relative Humidity Setpoint

DCV Max Ctrl Setpoint

Power Exhaust Setpoint

Configuration >Service Configuration

Economizer Exists

Yes

Configuration >Service Configuration > Continuous Occupied Exhaust

The

graph shows the current occupied or unoccupied setpoints. If occupied, these values are the current programmed setpoints plus the offset of any setpoint adjustment that may be in effect. If unoccupied, the values are the programmed unoccupied setpoints.

(Occupied or Unoccupied, depending on mode) The current programmed

setpoint adjusted by any offset that may be in effect.

(Occupied or Unoccupied, depending on mode) The current programmed

setpoint adjusted by any offset that may be in effect.

– The percentage of relative humidity in the space during

occupancy that will energize BO - 6 (Humidi-MiZer™).

– The percentage of relative humidity in the space during the

unoccupied time period that starts the unit and energizes BO - 6 (Humidi-MiZer™).

– The design difference between indoor and outdoor CO2 levels. D:

- The outside air damper position at which the controller energizes the

Power Exhaust relay.

, and

must be set to must be set to

R: 0 to 120°F

4 hr

0 to 4 hr

60%rh

0 to Unoccupied RH Control Setpoint

95%

30 to 100%

650ppm

0 to 9999 ppm

50% Open

20 to 90% Open

66 RTU Open

Page 73

Alarm Configuration

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Configuration

Alarm Configuration

HOME > CONFIG > ALARMS

Point Name/Description

Default/Range

Space Temperature Alarm

Occupied Alarm Hysteresis

Alarm Delay (min/deg) Unoccupied Low SPT Alarm Limit

Space Temperature Alarm

Unoccupied High SPT Alarm Limit

Space Temperature Alarm

Supply Air Temperature Alarm

Low SAT Alarm Limit

Supply Air Temp Alarm

High SAT Alarm Limit

Supply Air Temp Alarm

Space Humidity Alarm

Low Space Humidity Alarm Limit

Configuration >Unit Configuration >Input 1

Function

Space RH Sensor

High Space Humidity Alarm Limit

Configuration >Unit Configuration >Input 1

Function

Space RH Sensor

IAQ/Ventilation Alarm

BACview:

– This value is added to the occupied high effective setpoint and subtracted from the occupied low effective setpoint to establish the occupied high and low limits that the space temperature must exceed before an occupied SPT alarm is generated. The alarm returns to normal when the space temperature drops below the high effective setpoint or rises above the low effective setpoint.

– Determines the amount of delay before an occupied space temperature alarm is generated when the controller transitions to the occupied mode. The delay time equals this value multiplied by the difference between the sensor temperature and occupied alarm setpoint plus 15 minutes.

–The value that the space temperature must drop below to generate a fixed hysteresis of 1° F for return to normal.

– The value that the space temperature must exceed to generate a fixed hysteresis of 1° F for return to normal.

– The value that the supply air temperature must drop below to generate a normal.

– The value that the supply air temperature must exceed to generate a normal.

. There is a fixed hysteresis of 1° F for return to

in the unoccupied mode. There is a

3°F

0 to 20°F

10 minutes

0 to 60 minutes

45°F

-60 to 250°F

90°F

-60 to 250°F

45°F

-60 to 250°F

120°F

-60 to 250°F

below to generate a Low Space Humidity Alarm. Requires a space relative humidity transmitter and

above to generate a High Space Humidity Alarm. Requires a space relative humidity transmitter and

RTU Open 67

– The value that the relative humidity must drop

– The value that the relative humidity must rise

(or 2)

set to

30%

0 – 99 %

70%

0 – 99 %

Page 74

Appendix A: RTU Open Points/Properties

Point Name/Description

Default/Range

Occupied High CO2 Alarm Limit

IAQ Alarm

Configuration >Unit

Configuration >Input 1

Function

IAQ Sensor

Service Configuration

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Configuration > Service Configuration HOME > CONFIG > SERVICE

Point Name/Description

Default/Range

Unit Type

Heat/Cool HP O/B Ctrl

HP Y1/W1 Ctrl

Compressor Stages Economizer Exists

Yes

Heat Type

Number Of Heat Stages

Continuous Occupied Exhaust Yes

Power Exhaust Setpoint.

Indoor CO2 Sensor Value @min (ma)

Indoor CO2 Sensor Value @max (ma)

Outdoor CO2 Sensor Value @min (ma)

Outdoor CO2 Sensor Value @max (ma)

generate an for return to normal. Requires a space CO2 sensor and

– The value that the CO2 sensor must exceed to

in the occupied mode. There is a fixed hysteresis of 100ppm

(or 2)

set to

1200ppm

0 to 9999 ppm

BACview:

– The type of equipment that the RTU Open is controlling.

Options:

– Standard rooftop air handling unit.

– Heat Pump application, uses reversing valve output to control heating

and cooling.

– Carrier Heat Pump application only.

– The number of mechanical cooling stages. D:

– Set to

to enable economizer control for units equipped with

an economizer damper.

– The type of heating that the unit has. D:

– The number of heat stages. D:

– Configures the exhaust fan control strategy (BO-8). If

, the power exhaust runs continuously in occupied mode and is off in unoccupied

mode. If

, the power exhaust is controlled by the

– The CO2 value that corresponds to a 4mA

input at the appropriate input channel.

– The CO2 value that corresponds to a 20mA

input at the appropriate input channel.

– The CO2 value that corresponds to a 4 mA

input at the appropriate input channel.

Heat/Cool

Heat/Cool HP O/B Ctrl HP Y1/W1 Ctrl

One Stage

One Stage Two Stages

No/Yes

Electric

Electric/Gas

R: 2 1 /2 /0 (no heating)

No/Yes

0 ppm

0 to 9999 ppm

2000 ppm

0 to 9999 ppm

0 ppm

0 to 9999 ppm

– The CO2 value that corresponds to a 20 mA

input at the appropriate input channel.

68 RTU Open

2000 ppm

0 to 9999 ppm

Page 75

Point Name/Description

Default/Range

System Space Temperature

System Cool Demand Level

System Heat Demand Level

System Outside Air Temperature

network readable when enabled. Requires controller be equipped with an outdoor air

Service Test

Disable

Fan Test

Enable to test the controller's fan speeds. Sequences fan from low to high

Disable

Service Test

Enable

Compressor 1 Test

Service

Test

Enable

Compressor 2 Test

Service

Test

Enable

Heat 1 Test

Service Test

Enable

Heat 2 Test

Service Test

Enable

Reversing Valve Test

Service

Test

Enable

Dehumidification Test

Service

Test

Enable

Power Exhaust Test

Service Test

Enable

Economizer Test

Service Test

Enable

Analog Output 2 Test

– The network space temperature value that the

controller is using for control (if applicable).

– The system cool demand level being received over the

network.

– The system heat demand level being received over the

network.

– Allows the outside air temperature value to be

temperature sensor.

– Enable to stop automatic control so you can test the controller's

outputs. Automatically resets to

after 1 hour.

–

speed and operates at each speed for 1 minute. Resets to

must be set to

– Enable to test the controller's compressor 1 output.

must be set to

– Enable to test the controller's compressor 2 output.

must be set to

– Enable to test the controller's heat 1 output.

when complete.

must be set

-999.00 °F

N/A

0.00

0 - 3

0.00

0 - 3

-999.0°F

N/A

Disable

Disable/Enable

Disable

Disable/Enable

Disable

Disable/Enable

Disable

Disable/Enable

Disable

Disable/Enable

– Enable to test the controller's heat 2 output.

must be set to

– Set to a value between 0 and 100% to test the controller's

economizer output.

must be set

– Enable to test the controller's reversing valve output.

– Enable to test the controller's humidimizer output.

– Enable to test the controller's exhaust fan output.

must be set to

– Analog Output 2 (0-10 Vdc) is currently unused. D:

Disable

Disable/Enable

Disable

Disable/Enable

Disable

Disable/Enable

Disable

Disable/Enable

0% Open

0 to 100% Open

0 to 100%

RTU Open 69

Page 76

Appendix A: RTU Open Points/Properties

Maintenance

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Maintenance HOME > MAINT

Point Name/Description

Default/Range

Unit

Occupancy Status

Space Temp Sensor –

Sensor Failure SPT Sensor T55/56 Network

Airside Linkage Locked Value

Safety Chain Feedback

Fire Shutdown

Shutdown

Compressor Safety Status

Trouble

Enthalpy Status

Humidistat Input Status

Reset Supply Fan Runtime Alarm

Clear

Supply Fan Runtime

Reset Comp 1 Runtime Alarm

Clear

Compressor 1 Runtime

Reset Comp 2 Runtime Alarm

Clear

Compressor 2 Runtime

Reset Filter Runtime Alarm

Filter Runtime

Occupancy

BACview:

– The controller's occupancy status as determined by a network

schedule, a local schedule, or a timed override.

The source of the controlling space temperature value.

Options:

– No valid space temperature or sensor status = failed.

– An SPT sensor is connected to the controller’s Rnet port. – A T55, T56, or T59 sensor is connected to the controller’s J20 terminals. – A network temperature sensor is bound to the controller’s space temperature

AV.

– The space temperature from a linked terminal.

–The controller’s space temperature input has been manually locked at a

value.

- Indicates a completed circuit from J1, 1 to J1, 9. This circuit is

typically used for safety devices that immediately stop unit operation when tripped.

–

tripped.

– The enthalpy status determined by an enthalpy switch. R: High/Low

indicates that a fire shutdown is in effect. R: Run Enabled/

–

– The humidity status determined by a humidistat. R: High/Low

indicates that the compressor safety device has

– Set to

to reset

to 0. D:

R: Occupied/Unoccupied

R: Sensor Failure

SPT Sensor T55/T56 Network Airside Linkage Locked Value

R: Off/Run Enabled

Shutdown

R: Normal/Trouble

Run

Run/Clear

Run

Run/Clear

70 RTU Open

– Set to

to reset

to 0. D:

Run

Run/Clear

Off

Off/On

Page 77

Point Name/Description

Default/Range

BAS On/Off

Inactive

Occupied

Unoccupied

NOTE

BAS On/Off

Unoccupied

Occupied

Optimal Start

Schedules

Pushbutton Override

Active

Override Time Remaining Runtime

Supply Fan Runtime

Reset Supply Fan Runtime Alarm

Compressor 1 Runtime

Reset Comp 1 Runtime Alarm

Compressor 2 Runtime

Reset Comp 2 Runtime Alarm

Filter Runtime

Reset Filter Runtime Alarm

Alarms

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Alarms HOME > ALARM

Point Name/Description

Range

Safety Chain

Fire Shutdown

Compressor Safety

Space Temp Sensor –

– Determines the occupancy state of the controller and can be set over the

network by another device or third party BAS.

Options:

•

– Occupancy is determined by a configured schedule.

– The controller is always in the occupied mode.

– The controller is always in the unoccupied mode.

is set to either

automatically disabled.

– The controller's occupancy status based on the local schedule. R: Occupied/Unoccupied

–

override the occupancy state.

indicates if a user pushed the sensor's override button to

– The amount of time remaining in an override period.

– The total number of hours that the supply fan relay has been

energized since the runtime was last reset to 0 using

– The total number of hours that the Compressor 1 relay has

been energized since the runtime was last reset 0 using

, the

routine is

Inactive

Inactive Occupied Unoccupied

R: Off/Active

R: 0 to 240 minutes

R: ___ hr

– The total number of hours that the Compressor 2 relay has

been energized since the runtime was last reset using

– The total number of hours that the unit has been operating since the

runtime was last reset to 0 using

BACview:

– Indicates if the Safety Chain circuit trips. R: Normal/Alarm

– Indicates if the Fire Shutdown circuit trips. R: Normal/Alarm

– Indicates if the Compressor Safety circuit trips. R: Normal/Alarm

Indicates if the space temperature sensor fails. R: Normal/Alarm

R: ___ hr

RTU Open 71

Page 78

Appendix A: RTU Open Points/Properties

Point Name/Description

Range

Supply Air Temp Sensor –

Outdoor Air Temp Sensor Alarm –

Space Relative Humidity Sensor –

IAQ Sensor –

OAQ Sensor –

Space Temperature –

Alarming Temperature

Alarm Limit Exceeded

High Supply Air Temperature

High SAT

Alarm Limit

Low Supply Air Temperature

Low SAT

Alarm Limit

Setpoint Slider

Switch Configuration

Analog Input Configuration

High Space Relative Humidity

High

Space Humidity Alarm Limit

Low Space Relative Humidity

Low

Space Humidity Alarm Limit

High CO2

Occupied High CO2 Alarm Limit

Supply Fan Runtime

Supply Fan

Service Alarm Timer

Compressor 1 Runtime Compressor 1 Service Alarm Timer

Compressor 2 Runtime Compressor 2 Service Alarm Timer

Filter

Service Alarm Timer

Airside Linkage Alarm

Indicates if the supply air temperature sensor fails. R: Normal/Alarm

Indicates if the outdoor air temperature sensor fails. R: Normal/Alarm

Indicates if the space relative humidity sensor fails. R: Normal/Alarm

Indicates if the indoor air quality (CO2) sensor fails.

Indicates if the outdoor air quality (CO2) sensor fails.

Indicates if the space temperature sensor exceeds the high or low alarm

limit.

– The value of the alarming space temperature sensor. (Visible only in

an alarm condition.)

– The alarm limit that the alarming space temperature sensor exceeded.

(Visible only in an alarm condition.)

– Indicates if the supply air temperature exceeds the

– Indicates if the supply air temperature falls below the

– Indicates if the T56 sensor's setpoint slider potentiometer fails. R: Normal/Alarm

– Indicates if a duplicate configuration exists for two or more binary Input

3, 5, 8, & 9 Functions.

– Indicates if a duplicate configuration exists at the analog Input 1

& 2 Functions.

– Indicates if the space relative humidity exceeds the

– Indicates if the space relative humidity falls below the

R: Normal/Alarm

R: The sensor's

range

R: -60 to 250°F

R: Normal/Alarm

– Indicates if the indoor CO2 level rises above the

– Indicates a dirty filter condition when the filter runtime exceeds the value of the

72 RTU Open

. R: Normal/Alarm

– Indicates if the supply fan runtime exceeds the value of the

R: Normal/Alarm

– Indicates if the compressor 1 runtime exceeds the value of the

R: Normal/Alarm

– Indicates if the compressor 1 runtime exceeds the value of the

R: Normal/Alarm

R: Clean/Dirty

or in response to a filter status switch binary input.

– Indicates if Linkage fails in a zoned system using Linkage. R: Normal/Alarm

Page 79

Linkage

Navigation:

i-Vu / Field Assistant:

Properties > Equipment > Linkage Properties > Equipment > Linkage

Point Name/Description

Range

Airside Linkage Status

Active

Not

Active

Airside Linkage Status

Active

Occupancy Status Space Temperature Occupied Cooling Setpoint Occupied Heating Setpoint Unoccupied Cooling Setpoint Unoccupied Heating Setpoint Indoor Air CO2 Space Relative Humidity

I/O Points

I/O Points Properties

Power User

Navigation:

i-Vu / Field Assistant:

Properties > I/O Points N/A

Point Name/Description

Space Temp input 1

input 2

input 6

input 7

input 10

BACview:

Linkage Collector – Allows access to the Collector's details.

– If

, the controller is a stand-alone device.

If the VVT Master (as applicable):

, the controller is part of a linked system. If

, the following provide information received from

The values shown on the values shown on status displays that are affected by control program logic.

i-Vu users logged in as channels and the display names for all channels.

We strongly recommend that you leave these parameters at their defaults. The RTU Open is not a programmable controller. I/O can only be used for the purpose designed in the equipment control program. Modifying these parameters may result in unpredictable equipment control.

See Wiring inputs and outputs (page 12) for more information. This table lists each of the I/O Channels, their functions, associated hardware, and terminal numbers.

and above are able to edit various parameters associated with the input

R: Active/Not Active

page are the raw values at the I/O objects and may not match

– The value of the Optional SPT (Rnet) sensor. Also allows i-Vu and Field Assistant users access to

sensor configuration. See Carrier Sensors Installation Guide for additional details.

– Input Channel 1; 4 - 20 mA only. User-configurable for IAQ, OAQ, or Space RH.

– Input Channel 2; 4 - 20 mA only. User-configurable for IAQ, OAQ, or Space Relative Humidity.

– Input Channel 6; 10K Thermistor only. Supply Air Temperature.

RTU Open 73

– Input Channel 7; 10K Thermistor only. Outside Air Temperature.

– Input Channel 10; 10K Thermistor only. Space Temperature (T55, 56, 59).

BACview:

Page 80

Appendix A: RTU Open Points/Properties

Point Name/Description

input 11

slidepot voltage reading

input 3 input 4

input 5

input 8

input 9

Sensor Invalid ao 1

ao 2

relay 1

relay 2

relay 3

relay 4

relay 5

relay 6

relay 7

relay 8

– Input Channel 11; 100K Potentiometer only. Setpoint adjust (T56, 59).

– Input Channel 11; used to detect an open circuit (faulty Setpoint adjustment mechanism).

– Input Channel 3; Dry Contact only. User-configurable for No Function, Compressor Safety, Fan Status, Filter

Status, Remote Occupancy, or Door Contact.

– Input Channel 4; Dry Contact only. Safety Chain.

– Input Channel 5; Dry Contact only. User-configurable for No Function, Fire Shutdown, Fan Status, Filter

Status, Remote Occupancy, or Door Contact.

– Input Channel 8; Dry Contact only. User-configurable for No Function, Enthalpy, Fan Status, Filter Status,

Remote Occupancy, or Door Contact.

– Input Channel 9; Dry Contact only. User-configurable for No Function, Humidistat, Fan Status, Filter Status,

Remote Occupancy, or Door Contact.

– Reflects the status of the Space Temp (Rnet) input. On = Space Temp invalid,

Off = Space Temp valid.

– Analog Output Channel 1; jumper selectable.

– Analog Output Channel 2; 0 - 10 Vdc. Not Utilized.

– Binary Output 1; Fan (G) Output.

– Binary Output 2; Heat 2 (W2) Output.

– Binary Output 3; Heat 1 (W1) Output.

– Binary Output 4; Cool 2 (Y2) Output.

– Binary Output 5; Cool 1 (Y1) Output.

– Binary Output 6; Humidi-MiZer ™ Output.

– Binary Output 7; Reversing Valve Output.

– Binary Output 8; Power Exhaust Output.

74 RTU Open

Page 81

Single Point Linkage

System Cool Demand Level

System Heat Demand Level

System Outside Air Temperature

Properties

Network Points

System Heat & Cool Demand Level

Address

Properties

Network Points

Appendix B: Single Point Linkage and Device Address Binding

The RTU Open receives data from other Open controllers when they are installed as part of an Open system. The data transfer may take the form of Single Point Linkage (SPL), which is automatic, or Device Address Binding, which you must configure.

Currently, the RTU Open implements Single Point Linkage for 3 variables: Refer to configuration section -

complete list - make list to system system configuration1.....might be different for RTU - might be unit config

•

Network Points for which SPL has been implemented are displayed in the i-Vu application and Field Assistant on the

The following example involves outside air temperature. similarly, except that their usage involves a specific application loaded on a Universal Controller Open. See UC Open Installation Guide for additional information. In either case, note that the BACnet type and instance numbers specified in the

Network variables for which SPL is used are easily identified on the The asterisk in the BACnet address invokes the SPL function. These addresses cause the controller to issue a BACnet “who has” command for this variable. The controller binds to the closest of the first five devices from which it receives a valid response.

page >

field of these variables have been predefined.

tab.

page >

behaves

tab.

RTU Open 75

Page 82

Appendix B: Single Point Linkage and Device Address Binding

Device Address Binding

System Space Temperature

Properties

Network Points

As described previously, controllers when they are connected by a network. You must configure this method.

Currently, the RTU Open allows

Network Points on which DAB may be implemented are displayed in the i-Vu application and Field Assistant on the

page >

allows the RTU Open to receive data from other Open

(DAB) only for

tab with an undefined BACnet address.

76 RTU Open

Page 83

Index

#CRSTATUS005A00 • 32 #33CSENTHSW • 29 #33ZCSENCO2 • 24, 26 #33ZCSENOAT • 23 #33ZCSENSAT • 22 #33ZCSENSRH-02 • 27 #33ZCT55CO2 • 24 #33ZCT56CO2 • 24 #3CSENTSEN • 29 #33ZCSENDRH-02 • 27

Analog outputs • 3 Auxiliary control power transformer • 8

BACnet compliance • 58 BACnet objects • 3 BACnet port • 11 Battery • 3 BT485 • 11

Compliance • 58

Device Address Binding • 76 Dimensions • 3 Duct Air Temperature sensor • 22

Duct sensors

Duct Air Temperature sensor • 22

Supply Air Temperature sensor • 22

Environmental operating range • 3

FCC compliance • 58 Field Assistant • 59 Field-supplied hardware • 20

I/O Points • 12 Inputs • 3, 13 Inputs and outputs • 12 i-Vu • 59

LED's • 56 Linkage • 75

Module Status report • 56 Mounting the controller • 6

MS/TP Baud Rate • 10 MS/TP network, wiring • 11

Output resolution • 3 Outputs • 3

Points/Properties • 59

Airside Linkage Alarm • 71 Airside Linkage Status • 73 Alarm Delay (min/deg) • 67 Alarm Limit Exceeded • 71 Alarming Temperature • 71 Analog Input Configuration • 71 Analog Output 2 Test • 67 BAS On/Off • 70 Compressor 1 Runtime • 70 Compressor 1 Runtime alarm • 71 Compressor 1 Service Alarm Timer • 60 Compressor 1 Test • 68 Compressor 2 Runtime • 70 Compressor 2 Runtime alarm • 71 Compressor 2 Service Alarm Timer • 60 Compressor 2 Test • 68 Compressor Safety alarm • 71 Compressor Safety Status • 70 Compressor Stages • 41, 68 Continuous Occupied Exhaust • 41, 68 Cooling Capacity • 63 Cooling Design Temp • 63 Cooling Lockout Temp • 60 DCV Max Ctrl Setpoint • 40, 60 DCV Max Vent Damper Pos • 60 Dehumidification Test • 68 Economizer Exists • 41, 68 Economizer High OAT Lockout • 60 Economizer Output • 59 Economizer Test • 68 Enthalpy Status • 70 Fan Mode • 38, 60 Fan Off Delay • 60 Fan Test • 68 Filter Alarm • 71 Filter Runtime • 70 Filter Service Alarm Timer • 60 Fire Shutdown • 70 Fire Shutdown alarm • 71 Heat 1 Test • 68 Heat 2 Test • 68 Heat Type • 41, 68 Heating Capacity • 63 Heating Design Temp • 63

RTU Open 77

Page 84

Index

Heating Lockout Temperature • 60

High CO2 alarm • 71

High SAT Alarm Limit • 67

High Space Humidity Alarm Limit • 67

High Space Relative Humidity alarm • 71

High Supply Air Temperature alarm • 71

HP Rev Cycle Lockout Temmp • 60

Humidistat Input Status • 70

Hysteresis • 63

IAQ Sensor alarm • 71

Indoor Air CO2 • 59, 73

Indoor CO2 Sensor Value @max (ma) • 41, 68

Indoor CO2 Sensor Value @min (ma) • 41, 68

Input # Function • 38, 60

Input # Switch Configuration • 38, 60

LAT Airflow Increase • 59

Linkage Collector • 73

Low SAT Alarm Limit • 67

Low Space Humidity Alarm Limit • 67

Low Space Relative Humidity alarm • 71

Low Supply Air Temperature alarm • 71

Maximum Heating SAT • 60

Minimum Cooling SAT • 60

Number of Heat Stages • 41, 68

OAQ Sensor alarm • 71

OAT System Sensor • 68

Occ Relative Humidity Setpoint • 40, 63

Occupancy Source • 38, 60

Occupancy Status • 70, 73

Occupied Alarm Hysteresis • 67

Occupied Cooling • 40, 63

Occupied Cooling 1 • 63

Occupied Cooling 2 • 63

Occupied Cooling Setpoint • 73

Occupied Heating • 40, 63

Occupied Heating 1 • 63

Occupied Heating 2 • 63

Occupied Heating Setpoint • 73

Occupied High CO2 Alarm Limit • 67

Operating Mode • 59

Optimal Start • 40, 63

Outdoor Air CO2 • 59

Outdoor Air Temp Sensor Alarm • 71

Outdoor Air Temperature • 59

Outdoor CO2 Sensor Value @max (ma) • 41, 68

Outdoor CO2 Sensor Value @min (ma) • 41, 68

Outside Air Temp Calibration • 60

Override Time Remaining • 70

Power Exhaust Setpoint • 40, 63

Power Exhaust Test • 68

Pushbutton Override • 60, 70

Reset Comp 1 Runtime Alarm • 70

Reset Comp 2 Runtime Alarm • 70

Reset Filter Runtime Alarm • 70

Reset Supply Fan Runtime Alarm • 70

Reversing Valve Test • 68

Safety Chain alarm • 71

Safety Chain Feedback • 70

Schedules • 70

Service Test • 68

Setpoint Slider • 71

Space Relative Humidity • 59, 73

Space Relative Humidity Sensor alarm • 71

Space sensor type • 38, 60 Space Temp Calibration • 60 Space Temp Sensor • 71 Space Temp Sensor Alarm • 71 Space Temperature • 73 Space Temperature - Prime Variable • 59 Space Temperature Alarm • 71 Supply Air Temp Calibration • 60 Supply Air Temp Sensor alarm • 71 Supply Air Temperature • 59 Supply Fan Runtime • 70 Supply Fan Runtime alarm • 71 Supply Fan Service Alarm Timer • 60 Supply Fan Status • 59 Switch Configuration • 71 System Cool Demand Level • 68 System Heat Demand Level • 68 System Mode • 59 System Outside Air Temperature • 68 System Space Temperature • 68 T5x Override Duration • 60 Unit Start Delay • 60 Unit Type • 41, 68 Unocc Free Cool Enable • 60 Unocc Relative Humidity Setpoint • 40, 63 Unoccupied Cooling • 40, 63 Unoccupied Cooling 1 • 63 Unoccupied Cooling 2 • 63 Unoccupied Cooling Setpoint • 73 Unoccupied Heating • 40, 63 Unoccupied Heating 1 • 63 Unoccupied Heating 2 • 63 Unoccupied Heating Setpoint • 73 Unoccupied High SPT Alarm Limit • 67 Unoccupied Low SPT Alarm Limit • 67

Vent Dmpr Pos / DCV Min Pos • 60 Power specifications • 3 Protection • 3

Replacing battery • 57 Rnet • 20 Rnet wiring specifications • 20 Rooftop equipment control power transformer • 8

Sequence of operation

Alarms • 51

Compressor Safety • 50

Cooling • 44

Dehumidification • 49

Demand limiting • 50

Door switch • 50

Economizer • 45

Enthalpy control • 47

Fan Status • 51

Filter Status • 51

Fire Shutdown • 50

Heat Pump operation • 49

Heating • 48

Indoor Air Quality • 47

Linkage • 53

78 RTU Open

Page 85

Index

Linkage Air Source Modes • 55

Occupancy • 43 Optimal Start • 46 Power Exhaust • 46 Remote occupancy • 50 Supply Fan • 44

Unoccupied Free Cooling • 46 Serial number • 56 Service Test • 37 Set communications protocol and baud rate • 10 Single Point Linkage • 75 Specifications • 3 SPT sensors • 20 Start-up • 36 Supply Air Temperature sensor • 22

T55 / T56 • 24 temperature sensors

Duct Air Temperature sensor • 22

SPT sensors • 20

Supply Air Temperature sensor • 22 Troubleshooting • 56

Weight • 3 Wiring

CO2 sensor • 24

Inputs • 3, 13

Outdoor air temperature sensor • 23

Output • 14

Supply air temperature sensor • 22

Wiring for power • 7 Wiring specifications • 11

Network • 11

Rnet • 20

RTU Open 79

Page 86

Page 87

Page 88

A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No. 11-808-427-01 · 6/13/2012

Carrier 11-808-427-01 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

What is the RTU Open controller?

Introduction

Specifications

Safety considerations

Field-supplied hardware

Installation

To mount the RTU Open

To wire the controller for power

Using the rooftop equipment control power transformer

Using an auxiliary control power transformer

To set the RTU Open's address

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

Wiring the RTU Open to the MS/TP network

Wiring specifications

To wire the controller to the network

Wiring inputs and outputs

Input wiring specifications

Inputs

Binary outputs

Analog output

To wire inputs and outputs

Wiring sensors to inputs

Field-supplied sensor hardware

Wiring an SPT sensor

Rnet wiring specifications

To wire the SPT sensor to the controller

Wiring a Supply Air Temperature sensor

Wiring a Duct Air Temperature sensor

Wiring specifications

To wire the SAT sensor to the controller

Wiring an Outdoor Air Temperature sensor

Wiring specifications

To wire a duct sensor to the controller

Wiring a CO2 sensor

Wiring specifications

To wire an OAT sensor to the controller

Wiring specifications

To wire the CO2 sensor to the controller

Wiring an Outdoor Air Quality sensor

Wiring a Relative Humidity sensor

Wiring specifications

To wire the OAQ sensor to the controller

Wiring a Humidistat

Wiring specifications

To wire the RH sensor to the controller

Wiring an enthalpy switch

Wiring specifications

To wire a humidistat to the controller

Wiring specifications

To wire an enthalpy switch (outdoor air) to the controller

Wiring a status switch

To wire an enthalpy switch (differential) to the controller

Wiring specifications

Wiring a compressor safety

To wire a status switch to the controller

Wiring specifications

Wiring an occupancy switch or door contact

To wire a compressor safety input to the controller

Wiring specifications

To wire an occupancy switch or door contact

Start-up

Service Test

Configuring the RTU Open's properties

Unit Configuration properties

Setpoint properties

Service Configuration properties

Occupancy

Sequence of Operation

Supply fan

Cooling

Economizer

Power Exhaust

Unoccupied Free Cooling

Optimal Start

Enthalpy control

Indoor Air CO2