RTU Open Installation and Start-up Guide CARRIER CORPORATION ©2010 A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No.
Table of Contents Introduction .................................................................................................................................................................. 1 What is the RTU Open controller? ......................................................................................................................1 Specifications ....................................................................................................................................................
Table of Contents Wiring a status switch ......................................................................................................................... 31 Wiring specifications ................................................................................................................ 31 To wire a status switch to the controller ................................................................................. 32 Wiring a compressor safety .....................................................
Table of Contents Linkage ................................................................................................................................................................ 71 I/O Points ............................................................................................................................................................ 71 Appendix B: Single Point Linkage and Device Address Binding ............................................................................
Introduction What is the RTU Open controller? The RTU Open controller is available as an integrated component of a Carrier rooftop unit, or as a fieldinstalled retrofit product. Its internal application programming provides optimum rooftop performance and energy efficiency. RTU Open enables the unit to run in 100% stand-alone control mode or it can communicate to the Building Automation System (BAS).
Introduction 2 RTU Open
Specifications RTU Open driver drv_rtuopn_std Power 24 Vac ±10%, 50–60 Hz 20 VA power consumption (26 VA with BACview attached) 26 Vdc (25 V min, 30 V max) Single Class 2 source only, 100 VA or less Access port J12 To connect a BACview6 Handheld, Virtual BACview, or Field Assistant Rnet port J13 For SPT sensors and a BACview6 in any of the following combinations, wired in a daisy-chain configuration: • • • 1 SPT Plus or SPT Pro 1–4 SPT Standards 1–4 SPT Standards, and 1 SPT Plus or SPT Pro Any of t
Introduction Overall dimensions A: B: 6-1/2 in. (16.5 cm) 6-1/2 in. (16.5 cm) Mounting dimensions 7 mounting holes in various positions Panel depth 2-1/2 in. (6.4 cm) Weight 11.2 oz (0.32 kg) BACnet support Conforms to the Advanced Application Controller (B-AAC) Standard Device Profile as defined in ANSI/ASHRAE Standard 135-2004 (BACnet) Annex L Listed by UL-873, FCC Part 15-Subpart B-Class A, CE EN50082-1997 Safety considerations Disconnect electrical power to the RTU Open before wiring it.
Installation To install the RTU Open: 1 Mount the controller (page 6). 2 Wire the controller for power (page 7). ○ Using the rooftop equipment control power transformer (page 7). ○ Using an auxiliary control power transformer (page 8). 3 Set the controller's address (page 9). 4 Wire inputs and outputs (page 12). 5 Wire sensors to the controller (page 18).
Installation To mount the RTU Open When you handle the RTU Open: • Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material. • Do not touch components or leads. • Handle the board by its edges. • Isolate from high voltage or electrostatic discharge. • Ensure that you are properly grounded. When you mount the RTU Open: • Do not locate in an area that is exposed to moisture, vibration, dust, or foreign material. • Follow NEC and local electrical codes.
Screw the RTU Open into an enclosed panel using the mounting slots on the cover plate. Leave about 2 in. (5 cm) on each side of the controller for wiring. To wire the controller for power CAUTIONS ○ The RTU Open is powered by a Class 2 power source. Take appropriate isolation measures when mounting it in a control panel where non-Class 2 circuits are present. ○ Do not power pilot relays from the same transformer that powers the RTU Open.
Installation 3 If the rooftop equipment has thermostat connection terminals, connect wiring harness J1 wire 1 to R, and J1 wire 3 to C. Alternately, connect the control power transformer wires to J1 connector wires 1 (24 Vac) and 3 (Gnd). 4 Apply power to the rooftop equipment. 5 Measure the voltage at the RTU Open’s J1 terminals 1 and 3 to verify that the voltage is within the operating range of 21.6–26.4 Vac. 6 Attach harness to RTU Open connector J1.
Optional * Safety chain devices, field-installed - normally closed. Apply 24 Vac to this terminal (jumper from J1 - 1 to J1 - 9) where no safety devices are installed. ** Fire shutdown device, field-installed, configurable as normally open or closed *** Enthalpy switch, field-installed - configurable as normally open or closed To set the RTU Open's address The RTU Open's two rotary switches determine the RTU Open's MAC address when it is placed on an MS/TP network.
Installation 1 Turn off the RTU Open's power. The controller reads the address each time you apply power to it. 2 Using the rotary switches, set the MSB (SW1) (10's) switch to the tens digit of the address, and set the LSB (SW2) (1's) switch to the ones digit. EXAMPLE To set the RTU Open’s address to 01, point the arrow on the MSB (SW1) switch to 0 and the arrow on the LSB (SW2) switch to 1. 3 Turn on the RTU Open's power.
Install a BT485 on the first and last controller on a network segment to add bias and prevent signal distortions due to echoing. See the MS/TP Networking and Wiring Installation Guide for more details. Wiring specifications Cable: 22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire Maximum length: 2000 feet (610 meters) To wire the controller to the network 1 Pull the screw terminal connector from the controller's power terminals labeled Gnd and 24 Vac or Hot.
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 AI 4-20 mA CO2 OAQ Space Relative Humidity J4 - 5 & 6 N/A Input 2 AI 4-20 mA CO2 OAQ Space Relative Humidity J4 - 2 & 3 N/A Input 3 BI 24 Vac Compressor Safety ** Fan Status Filter Status Remote Occupancy Door Contact 33ZCT55CO2 33ZCT56CO2 33ZCSENCO2 w/ 33ZCASPCO2 33ZCSENSRH-01 33ZCT55CO2 33ZCT56CO2 33ZCSENCO2 w/ 33
Channel Number Type Signal Function Part Number Wire/Terminal Numbers Alternate Terminals BO - 8 BO N/A - Relay Power Exhaust N/A J11 - 1 & 3 N/A Legend AI - Analog Input BI - Digital Input AO - Analog Output BO - Digital Output * Safety Chain Feedback - 24 Vac required at this wire to provide Run Enabled status. Provide a jumper from J1 - 1 to J1 - 9 if no safeties are utilized.
Installation Binary outputs The RTU Open has 8 binary outputs. You can connect each output to a maximum of 24 Vac/Vdc. Each output is a dry contact rated at 3 A, 24 V maximum, and is normally open. To size output wiring, consider the following: • Total loop distance from the power supply to the controller, and then to the controlled device NOTE Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length.
Optional * Safety chain devices, field-installed - normally closed. Apply 24 Vac to this terminal (jumper from J1 - 1 to J1 - 9) where no safety devices are installed. ** Fire shutdown device, field-installed, configurable as normally open or closed *** Enthalpy switch, field-installed - configurable as normally open or closed J4 Inputs 1 Turn off the RTU Open's power. 2 Connect the input and output wiring to the screw terminals on the RTU Open.
Installation NOTE J4 Analog Inputs 1 and 2 may be set for the following device types: ○ IAQ Sensor ○ OAQ Sensor ○ Space RH Sensor J5 Inputs The terminals for Inputs 3, 5, and 8 are available for use in place of the flying wire leads at Molex connectors J1 and J2 identified below: NOTE J5 binary inputs 3, 5, and 8 are the same input channels as: 16 ○ 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.
Installation NOTE Output relay contacts rated at 3A, 24V maximum. Install pilot relays required by application. NOTE J20 Analog Inputs 10 and 11 are reserved for a 10k Ohm space temperature sensor with an optional 100k Ohm offset potentiometer used for setpoint adjustment. Wiring sensors to inputs You may wire various sensors to the RTU Open's inputs. See the table below for details. NOTE This document gives instructions for wiring the sensors to the RTU Open.
NOTE For rooftop unit installation, see the base unit installation instructions. ELECTRICAL SHOCK HAZARD Failure to follow this warning could cause personal injury, death, and/or equipment damage. Disconnect all power to the unit before performing maintenance or service. Unit may automatically start if power is not disconnected.
Installation Wiring an SPT sensor The RTU Open is connected to a wall-mounted space temperature sensor to monitor room temperature.
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. Outer Jacket .25 in. (.6 cm) 2 Inner insulation Wire each terminal on the sensor to the same terminal on the controller. See diagram below.
Installation Wiring specifications Cable from sensor to controller: If <100 ft (30.5 meters) If >100 ft (30.5 meters) Maximum length: 500 feet (152 meters) 22 AWG, unshielded 22 AWG, shielded To wire the SAT sensor to the controller 1 Connect the wiring harness (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 J2 wires 1 and 2. 4 Verify your sensor readings.
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 J2 wires 1 and 2. 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.
Installation 3 Connect to J2 wires 3 and 4. 4 Verify your sensor readings. Wiring a CO2 sensor Part #33ZCSENCO2 (Display model) Part #33ZCT55CO2 (No display) Part #33ZCT56CO2 (No display) A CO2 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 CO2 sensor can be wall-mounted or mounted in a return air duct. Duct installation requires an Aspirator Box Accessory (Part #33ZCASPCO2).
Wiring diagram for #33ZCSENCO2: Wiring diagram for #33ZCT55/56CO2: Wiring an Outdoor Air Quality sensor Part #33ZCSENCO2 (Display model) An outdoor air quality (OAQ) sensor monitors outside air carbon dioxide levels. The RTU Open uses this information, in conjunction with a CO2 sensor, to adjust the outside air dampers to provide proper ventilation. An OAQ sensor is typically duct-mounted in the outside air stream. Duct installation requires an Aspirator Box Accessory (Part #33ZCASPCO2).
Installation 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 24 Vac transformer or DC power supply. Wiring specifications Cable from sensor to controller: If <100 ft (30.5 meters) If >100 ft (30.5 meters) Maximum length: 500 feet (152 meters) 22 AWG, unshielded 22 AWG, shielded To wire the OAQ sensor to the controller 1 Wire the sensor to the controller. See appropriate diagram below.
Wiring specifications Cable from sensor to controller: If <100 ft (30.5 meters) If >100 ft (30.5 meters) Maximum length: 500 feet (152 meters) 22 AWG, unshielded 22 AWG, shielded 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. NOTE Sensor may be terminated at Input 1 or 2.
Installation 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. NOTE Humidistat may be return duct or space mounted. Wiring an enthalpy switch Outdoor Air - Part #33CSENTHSW Return air - Part #33CSENTSEN The 33CSENTHSW is an outdoor air enthalpy switch/receiver.
To wire an enthalpy switch (outdoor air) to the controller An enhalpy switch is typically mounted in the outdoor air inlet. Wiring diagram for a field-installed enthalpy switch: NOTES RTU Open • Factory-installed enthalpy switches terminate at J2 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.
Installation Wiring diagram for factory-installed enthalpy switch: NOTE Factory-installed enthalpy switches terminate at J2 wires 6 (switch input) and 7 (24 Vac).
Wiring diagram for optional enthalpy sensor mounted in the return air for differential enthalpy: Wiring a status switch Filter - Part #33CSFS-01 or field-supplied Fan status - Part #33CSAS-01 or field-supplied Filter and/or fan status switches may be installed to provide a Dirty Filter indication or Fan Running status. Wiring specifications RTU Open Cable from sensor to controller: If <100 ft (30.5 meters) If >100 ft (30.
Installation To wire a status switch to the controller NOTES • Binary inputs 3, 5, 8, and 9 are configurable and may be used for Fan Status, Filter Status, Remote Occupancy, or Door Contacts, if they have not already been used for their default functions. • Follow device manufacturer's installation and operating instructions. Wiring a compressor safety This is typically provided by the manufacturer with the rooftop equipment. A compressor safety status may be monitored if available.
To wire a compressor safety input to the controller NOTES • 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. Wiring an occupancy switch or door contact 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.
Installation To wire an occupancy switch or door contact NOTES 34 • Binary Inputs 3, 5, 8, and 9 are configurable and may be used for Fan Status, Filter Status, Remote Occupancy, or Door Contacts - provided they have not been utilized for their default functions. • Follow device manufacturer's installation and operating instructions.
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. This interface... Provides a...
Start-up Service Test Navigation: i-Vu / Field Assistant: BACview: Properties > Equipment > Configuration > Service Configuration > Service Test HOME > CONFIG > SERVICE > TEST Service Test can be used to verify proper operation of compressors, heating stages, indoor fan, power exhaust fans, economizer, and dehumidification. It is highly recommended to use Service Test at initial system start-up and during troubleshooting. See Appendix A: Points/Properties (page 58) for more information.
• Use Power Exhaust Test to activate and deactivate the power exhaust (BO - 8) output. • Use Economizer Test to set the (AO - 1) economizer output to any value from 0 to 100% of configured output (2-10 Vdc or 4-20 mA). • Analog Output 2 Test (AO - 2) is currently unused and does not require testing. • Service Test mode does not timeout. Return all test variables to Disable or 0.00. Set Service Test to Disable or cycle power to the RTU Open to return to normal operation.
Start-up Point Name/Description Default/Range Input 2 Function – The type of sensor (4-20 mA) connected to terminals J4 – 1, 2, & 3. D: No Sensor R: No Sensor IAQ Sensor OAQ Sensor Space RH Sensor Input 3 Function – The usage of Input 3. You must also set Input 3 Switch Configuration. D: Compressor Safety Options: No Function – The input is not used. Compressor Safety – Safety device status. Fan Status – Proves supply fan operation. Filter Status – Indicates a dirty filter.
Point Name/Description Default/Range Input 9 Switch Configuration – The normal (de-energized) state for the set of contacts terminated at Input D: NO R: NO/NC (normally open/normally closed) D: T55 R: T55 T56 (Use for T59) SPT Sensor None Space sensor type - The type of local space temperature sensor.
Start-up Point Name/Description Default/Range Optimal Start – The earliest time, 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. D: 4 hr R: 0 to 4 hr Occ Relative Humidity Setpoint – The percentage of relative humidity in the space during occupancy that will energize BO - 6 (Humidi-MiZer™).
Point Name/Description Default/Range Continuous Occupied Exhaust – Configures the exhaust fan control strategy (BO-8). If Yes, the power exhaust runs continuously in occupied mode and is off in unoccupied mode. If No, the power exhaust is controlled by the Power Exhaust Setpoint. D: No R: No/Yes Indoor CO2 Sensor Value @min (ma) – The CO2 value that corresponds to a 4mA input at the appropriate input channel.
Sequence of Operation 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 units The RTU Open may operate as
Supply fan The RTU Open supply fan may be configured for one of three Fan Modes: • Auto - The fan cycles on/off in conjunction with heating or cooling • Continuous - The fan runs continuously during occupancy and intermittently during unoccupied periods with heating or cooling • Always On - The fan runs continuously regardless of occupancy or calls for heating and cooling Occupancy can be determined by Linkage, BACnet schedules, BAS schedules, or in response to a remote occupancy switch.
Sequence of Operation 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 Space Temperature to the: • Effective Occupied Cooling Setpoint when occupied • Effective Unoccupied Cooling Setpoint when unoccupied When the cooling algorithm preconditions have been met, the compressors are energized in stages, as applicable.
Unoccupied Free Cooling Unocc Free Cool Enable allows rooftop equipment with an economizer damper to utilize outdoor air for free cooling during unoccupied periods.
Sequence of Operation The actual equation that the controller uses to calculate Optimal Start is nonlinear. An approximation of the result is shown below. To change Optimal Start settings: 1 In the navigation tree, select the equipment that you want to change. 2 Click Properties page > Equipment tab > Configuration > Setpoints. Enthalpy control You may use an enthalpy switch to indicate the suitability of outdoor air for economizer cooling.
The following conditions must be true for the Indoor Air CO2 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.
Sequence of Operation Heat Pump operation The RTU Open can control heat pumps HP O/B and Y1/W1. HP O/B 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 (B), or energized with a call for cooling (O).
Demand Limit 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 Demand Level Setpoints. Each Demand Level (1 through 3) adjusts the heating and cooling setpoints outwards. By default, Demand 1 yields a 1° expansion, Demand 2 yields a 2° expansion, and Demand 3 yields a 4° expansion.
Sequence of Operation 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. Fan Status Fan Status may be configured on any unused binary input channel.
• 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 48) for further information. Space Temp Sensor – This alarm indicates an invalid sensor condition in a physically connected space temperature sensor (SPT Sensor/T5*).
Sequence of Operation Functions 1 and 2 are configured identically. Neither input may work reliably and downstream control may be affected, depending on the function duplicated. The alarm clears and normal control is restored when the input function duplication is corrected. High Space Relative Humidity - The RTU Open generates this alarm when the space humidity exceeds the Alarm Configuration > High Space Humidity Alarm Limit setpoint for 10 minutes.
Linkage 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.
Sequence of Operation 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.
Troubleshooting If you have problems mounting, wiring, or addressing the RTU Open, contact Carrier Control Systems Support. Serial number 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 LED's The LED's on the RTU Open show the status of certain functions. If this LED is on... Status is...
Troubleshooting If Run LED shows... And Error LED shows... Status is.. 14 flashes per second 14 flashes per second, alternating with Run LED Brownout On On Failure. Try the following solutions: • Turn the RTU Open off, then on. • Format the RTU Open.* • Download memory to the RTU Open. • Replace the RTU Open. *Formatting the controller may result in lost information and should only be done under the guidance of Carrier Control Systems Support.
Compliance FCC 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.
Appendix A: RTU Open Points/Properties Appendix A: RTU Open Points/Properties Status Navigation: i-Vu / Field Assistant: BACview: Properties > Equipment > Status HOME > STATUS Point Name/Description Range System Mode – The controller's current operating status. R: Disabled Test Run Operating Mode – The controller's current operating mode.
Unit Configuration Navigation: i-Vu / Field Assistant: BACview: Properties > Equipment > Configuration > Unit Configuration HOME > CONFIG > UNIT Point Name/Description Default/Range Fan Mode – The supply fan's operating mode. D: Continuous Options: Auto - The fan cycles on/off in conjunction with heating or cooling. Continuous - The fan runs continuously during occupancy & intermittently during unoccupied periods with heating or cooling.
Appendix A: RTU Open Points/Properties Point Name/Description Default/Range HP Rev Cycle Lockout Temp – The outdoor air temperature at which reverse cycle heating is locked out. Requires that the unit is configured as a Heat Pump. D: -3°F R: -20 to 30°F D: 65°F R: 35 to 150°F Unocc Free Cool Enable – Enable to allow the unit to use economizer to provide unoccupied free cooling (NTFC). D: Disable R: Disable/Enable Occupancy Source - The method that the controller uses to determine occupancy.
Point Name/Description Default/Range Input 8 Function – The usage of Input 8. You must also set Input 8 Switch Configuration. D: Enthalpy Switch Options: No Function – The input is not used. Enthalpy Switch – Indicates enthalpy status (high or low). Fan Status – Proves supply fan operation. Filter Status – Indicates a dirty filter. Remote Occupancy – Sets occupancy using a hardware contact. Door Contact – Sets occupancy using a hardware contact.
Appendix A: RTU Open Points/Properties Navigation: i-Vu / Field Assistant: BACview: Properties > Equipment > Configuration > Setpoints HOME > CONFIG > SETPOINT Select a color band on the setpoint graph to see the current setpoints in the Heating and Cooling fields. See setpoint descriptions below. Occupied Setpoints The occupied setpoints described below are the setpoints under normal operating conditions. The Demand Level 1–3 setpoints apply if demand limiting is used.
Default Range: -40 to 245°F Demand Level Point Name/Description Occupied 1 2 3 Occupied Cooling 1 – Yellow 75°F The space temperature must be greater than the Occupied Cooling 1 setpoint for 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 Occupied Cooling setpoint. We recommend that the Occupied Cooling 1 value be set no less than 0.5°F above the Occupied Cooling setpoint.
Appendix A: RTU Open Points/Properties Point Name/Description Default/Range Heating Capacity – 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.
Point Name/Description Default/Range Heating – (Occupied or Unoccupied, depending on mode) The current programmed Heating setpoint adjusted by any offset that may be in effect. R: 0 to 120°F Cooling – (Occupied or Unoccupied, depending on mode) The current programmed Cooling setpoint adjusted by any offset that may be in effect.
Appendix A: RTU Open Points/Properties Point Name/Description Default/Range Unoccupied High SPT Alarm Limit – The value that the space temperature must exceed to generate a Space Temperature Alarm in the unoccupied mode. There is a fixed hysteresis of 1° F for return to normal. D: 90°F R: -60 to 250°F D: 45°F R: -60 to 250°F D: 120°F R: -60 to 250°F Low Space Humidity Alarm Limit – The value that the relative humidity must drop below to generate a Low Space Humidity Alarm.
Point Name/Description Default/Range Compressor Stages – The number of mechanical cooling stages. D: One Stage R: One Stage Two Stages Economizer Exists – Set to Yes to enable economizer control for units equipped with an economizer damper. D: No R: No/Yes Heat Type – The type of heating that the unit has. D: Electric R: Electric/Gas D: 2 R: 1 /2 /0 (no heating) Continuous Occupied Exhaust – Configures the exhaust fan control strategy (BO-8).
Appendix A: RTU Open Points/Properties Point Name/Description Default/Range Compressor 2 Test – Enable to test the controller's compressor 2 output. Service Test must be set to Enable. D: Disable R: Disable/Enable Heat 1 Test – Enable to test the controller's heat 1 output. Service Test must be set to Enable. D: Disable R: Disable/Enable Heat 2 Test – Enable to test the controller's heat 2 output. Service Test must be set to Enable.
Point Name/Description Default/Range Fire Shutdown – Shutdown indicates that a fire shutdown is in effect. R: Run Enabled/ Shutdown Compressor Safety Status – Trouble indicates that the compressor safety device has tripped. R: Normal/Trouble Enthalpy Status – The enthalpy status determined by an enthalpy switch. R: High/Low Humidistat Input Status – The humidity status determined by a humidistat. R: High/Low Reset Supply Fan Runtime Alarm – Set to Clear to reset Supply Fan Runtime to 0.
Appendix A: RTU Open Points/Properties Alarms Navigation: i-Vu / Field Assistant: BACview: Properties > Equipment > Alarms HOME > ALARM Point Name/Description Range Safety Chain – Indicates if the Safety Chain circuit trips. R: Normal/Alarm Fire Shutdown – Indicates if the Fire Shutdown circuit trips. R: Normal/Alarm Compressor Safety – Indicates if the Compressor Safety circuit trips. R: Normal/Alarm Space Temp Sensor – Indicates if the space temperature sensor fails.
Point Name/Description Range Compressor 2 Runtime – Indicates if the compressor 1 runtime exceeds the value of the Compressor 2 Service Alarm Timer. R: Normal/Alarm Filter – Indicates a dirty filter condition when the filter runtime exceeds the value of the Filter Service Alarm Timer or in response to a filter status switch binary input. R: Clean/Dirty Airside Linkage Alarm – Indicates if Linkage fails in a zoned system using Linkage.
Appendix A: RTU Open Points/Properties Navigation: i-Vu / Field Assistant: BACview: Properties > I/O Points N/A Point Name/Description Space Temp – The value of the Optional SPT (Rnet) sensor. Also allows i-Vu & Field Assistant users access to sensor configuration. See Carrier Sensors Installation Guide for additional details. input 1 – Input Channel 1; 4 - 20 mA only. User-configurable for IAQ, OAQ, or Space RH. input 2 – Input Channel 2; 4 - 20 mA only.
Appendix B: Single Point Linkage and Device Address Binding Single Point Linkage 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.....
Appendix B: Single Point Linkage and Device Address Binding Device Address Binding As described previously, Device Address Binding allows the RTU Open to receive data from other Open controllers when they are connected by a network. You must configure this method. Currently, the RTU Open allows Device Address Binding (DAB) only for System Space Temperature.
Index Index B BACnet compliance • 57 BACnet port • 11 BT485 • 10 C Compliance • 57 D Duct Air Temperature sensor • 22 Duct sensors Duct Air Temperature sensor • 22 Supply Air Temperature sensor • 21 F FCC compliance • 57 Field Assistant • 58 I i-Vu • 58 L Linkage • 73 M Module Status report • 55 MS/TP network, wiring • 10 P Points/Properties • 58 Airside Linkage Alarm • 70 Airside Linkage Status • 71 Alarm Delay (min/deg) • 65 Alarm Limit Exceeded • 70 Alarming Temperature • 70 Analog Input Configur
Index Operating Mode • 58 Optimal Start • 39, 61 Outdoor Air CO2 • 58 Outdoor Air Temp Sensor Alarm • 70 Outdoor Air Temperature • 58 Outdoor CO2 Sensor Value @max (ma) • 40, 66 Outdoor CO2 Sensor Value @min (ma) • 40, 66 Outside Air Temp Calibration • 59 Override Time Remaining • 68 Power Exhaust Setpoint • 39, 61 Power Exhaust Test • 66 Pushbutton Override • 59, 68 Reset Comp 1 Runtime Alarm • 68 Reset Comp 2 Runtime Alarm • 68 Reset Filter Runtime Alarm • 68 Reset Supply Fan Runtime Alarm • 68 Reversing
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