Carrier 11-808-427-01 - Manuals

Introduction 4 RTU Open 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...

RTU Open 5 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...

Installation 6 RTU Open 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...

RTU Open 7 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 ○ The RTU Open is powered by a Class 2 power source. Take appropriate isolation measures when mountin...

Installation 8 RTU Open 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 ...

RTU Open 9 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 - ...

Installation 10 RTU Open 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 ...

RTU Open 11 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, shi...

Installation 12 RTU Open Wiring inputs and outputs RTU Open Inputs and Outputs Table Channel Number Type Signal Function Part Number Wire/Terminal Numbers Input 1 Alternate Terminals AI 4-20 mA CO2 OAQ Space Relative Humidity 33ZCT55CO2 33ZCT56CO2 33ZCSENCO2 w/ 33ZCASPCO2 33ZCSENSRH-01 J4 N/A - 5 &a...

RTU Open 13 Channel Number Type Signal Function Part Number Wire/Terminal Numbers BO - 8 Alternate Terminals BO N/A - Relay Power Exhaust N/A J11 N/A - 1 & 3 Legend AI - Analog Input AO - Analog Output BI - Digital Input BO - Digital Output * Safety Chain Feedback - 24 Vac required at this wire ...

Installation 14 RTU Open 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...

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 -...

Installation 16 RTU Open 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...

Installation 18 RTU Open 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...

RTU Open 19 NOTE For rooftop unit installation, see the base unit installation instructions. Failure to follow this warning could cause personal injury, death, and/or equipment damage. ELECTRICAL SHOCK HAZARD Disconnect all power to the unit before performing maintenance or service. Unit may automat...

Installation 20 RTU Open Wiring an SPT sensor The RTU Open is connected to a wall-mounted space temperature sensor to monitor room temperature. An i-Vu Open Control System offers the following SPT sensors: Sensor Part # Features SPS SPT Standard • Local access port • No operator control SPPL SPT Plu...

RTU Open 21 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. Ou...

Installation 22 RTU Open 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 (OPN-RTUHRN). For de...

RTU Open 23 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" diamet...

Installation 24 RTU Open 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 CO 2 sensor monitors carbon dioxide levels. As CO 2 levels increase, the RTU Open adjusts the outs...

RTU Open 25 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, t...

Installation 26 RTU Open 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...

RTU Open 27 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 (...

Installation 28 RTU Open 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 Humi...

RTU Open 29 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 • Factory-installed enthalpy switches terminate at J2 wires 6 (switch input) and 7 (24 Vac). • Input cha...

Installation 30 RTU Open Wiring diagram for factory-installed enthalpy switch: NOTE Factory-installed enthalpy switches terminate at J2 wires 6 (switch input) and 7 (24 Vac). To wire an enthalpy switch (differential) to the controller

RTU Open 31 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 i...

Installation 32 RTU Open 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'...

RTU Open 33 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 cont...

Installation 34 RTU Open To wire an occupancy switch or door contact NOTES • 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 manufact...

Start-up 36 RTU Open 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 ...

RTU Open 37 • 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 requ...

RTU Open 39 Point Name/Description Default/Range Input 9 Switch Configuration D: – The normal (de-energized) state for the set of contacts terminated at Input R: NO NO/NC (normally open/normally closed) Space sensor type D: - The type of local space temperature sensor. R: T55 T55 T56 (Use for T59) S...

Start-up 40 RTU Open Point Name/Description Default/Range Optimal Start D: – 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 Sta...

Sequence of Operation 42 RTU Open 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 contr...

RTU Open 43 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 ...

Sequence of Operation 44 RTU Open 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 occ...

RTU Open 45 Unoccupied Free Cooling Unocc Free Cool Enable allows rooftop equipment with an economizer damper to utilize outdoor air for free cooling during unoccupied periods. The following conditions must be true for unoccupied free cooling to operate: • Unocc Free Cool Enable set to Enable • The ...

Sequence of Operation 46 RTU Open 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 >...

RTU Open 47 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 d...

Sequence of Operation 48 RTU Open 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...

RTU Open 49 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 Se...

Sequence of Operation 50 RTU Open 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 ...

RTU Open 53 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 b...

Sequence of Operation 54 RTU Open 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...

RTU Open 55 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 (modsta...

Troubleshooting 56 RTU Open If Run LED shows... And Error LED shows... 14 flashes per second Status is.. 14 flashes per second, alternating with Run Brownout LED On On Failure. Try the following solutions: • Turn the RTU Open off, then on. • Format the RTU Open.* • Download memory to the RTU Open. •...

RTU Open 57 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 env...

Appendix A: RTU Open Points/Properties 58 RTU Open Status Navigation: i-Vu / Field Assistant: BACview: Properties > Equipment > Status HOME > STATUS Point Name/Description Range System Mode R: – The controller's current operating status. Disabled Test Run Operating Mode R: – The controller'...

RTU Open 59 Unit Configuration Navigation: i-Vu / Field Assistant: BACview: Properties > Equipment > Configuration > Unit Configuration HOME > CONFIG > UNIT Point Name/Description Default/Range Fan Mode Options: – The supply fan's operating mode. Auto - The fan cycles on/off in conjun...

RTU Open 61 Point Name/Description Default/Range Input 8 Function – The usage of Input 8. You must also set Input 8 Switch Configuration Options: . No Function – The input is not used. Enthalpy Switch – Indicates enthalpy status (high or low). Fan Status – Proves supply fan operation. Filter Status ...

RTU Open 65 Point Name/Description Heating – (Occupied or Unoccupied, depending on mode) The current programmed Heating setpoint adjusted by any offset that may be in effect. Default/Range R: 0 to 120°F Cooling – (Occupied or Unoccupied, depending on mode) The current programmed Cooling R: setpoint ...

Appendix A: RTU Open Points/Properties 66 RTU Open Point Name/Description Default/Range Unoccupied High SPT Alarm Limit – The value that the space temperature must exceed to generate a Space Temperature Alarm D: in the unoccupied mode. There is a fixed hysteresis of 1° F for return to normal. R: 90°...

Appendix A: RTU Open Points/Properties 68 RTU Open 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: . R: Disable Disable/Enable Heat 1 Test – Enable to test the controller's heat 1 output. Service Test...

Appendix A: RTU Open Points/Properties 70 RTU Open Alarms i-Vu / Field Assistant: Navigation: BACview: Properties > Equipment > Alarms HOME > ALARM Point Name/Description Range Safety Chain R: – Indicates if the Safety Chain circuit trips. Normal/Alarm Fire Shutdown R: – Indicates if the Fi...

RTU Open 73 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 Op...

Appendix B: Single Point Linkage and Device Address Binding 74 RTU Open 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...

Index RTU Open 75 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 •...