Carrier 48LCB07 Controls, Start-Up, Operation And Troubleshooting
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Carrier 48LCB07 Controls, Start-Up, Operation And Troubleshooting

Carrier 48LCB07 Controls, Start-Up, Operation And Troubleshooting

With vav-rtu open controller
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Controls, Start-Up, Operation and
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SENSOR/ACCESSORY INSTALLATION . . . . . . . . . . 3
Sensors and Accessories . . . . . . . . . . . . . . . . . . . . . 7
User Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Install Analog Sensors . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing Discrete Inputs . . . . . . . . . . . . . . . . . . . . . 14
Communication Wiring . . . . . . . . . . . . . . . . . . . . . . . 15
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
VAV-RTU Open System Start-Up . . . . . . . . . . . . . . . 17
Additional Installation/Inspection . . . . . . . . . . . . . . 17
Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
• INPUTS
LINKAGE BASED OPERATION . . . . . . . . . . . . . . . . 22
Occupancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Indoor (Supply) Fan . . . . . . . . . . . . . . . . . . . . . . . . . 22
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480277-01
Troubleshooting
Page
Printed in U.S.A.
Form 48-50LCB-7-26-02T Rev. A
with VAV-RTU Open Controller
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Supply Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Enthalpy Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Space Air Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Supply Air Tempering . . . . . . . . . . . . . . . . . . . . . . . .24
Demand Controlled Ventilation . . . . . . . . . . . . . . . .24
Demand Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Unoccupied Free Cooling . . . . . . . . . . . . . . . . . . . . .24
Fire Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Compressor Safety . . . . . . . . . . . . . . . . . . . . . . . . . .25
Fan Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Filter Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
OPERATION - STANDALONE MODE . . . . . . . . . . .25
mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Cooling (standalone mode) . . . . . . . . . . . . . . . . . . . .26
Supply Fan (standalone mode) . . . . . . . . . . . . . . . . .26
Economizer (standalone mode) . . . . . . . . . . . . . . . .26
Heating (standalone mode) . . . . . . . . . . . . . . . . . . . .27
(standalone mode) . . . . . . . . . . . . . . . . . . . . . . . . . 28
Demand Limit (standalone mode) . . . . . . . . . . . . . .28
Fire Shutdown (standalone mode) . . . . . . . . . . . . . .28
Pg 1
48/50LCB07-26
3-2020 Replaces: 48-50LCB-7-26-01T

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  • Page 1: Table Of Contents

    48/50LCB07-26 with VAV-RTU Open Controller Controls, Start-Up, Operation and Troubleshooting CONTENTS Cooling ........22 Supply Fan .

  • Page 2: Safety Considerations

    • SUPPLY FAN FAILURE • SUPPLY FAN IN HAND This document is to be used in conjunction with the following • COMPRESSOR STATUS Carrier Corporation manuals: • SPACE TEMP SENSOR • Equipment Touch Installation and Setup Guide • ZS SENSOR •...

  • Page 3: General

    VAV-RTU Open en- through the hole provided in the corner post, then feed the wires ables the unit to operate with Carrier’s i-Vu Open network with i- thorough the raceway to the VAV-RTU Open. Connect the wires to Vu VAV zone controllers (Fig.
  • Page 4 Fig. 2 — VAV-RTU Open Control Module...
  • Page 5 Enclosed Energy Management Equipment High (with filter) 88FO E143900 Flow TYPE: 002101 CAUTION: To ReduceThe Risk of Fire or Electric Shock, Do Not Interconnect the Outputs of Different Class 2 Circuits. CAUTION: Rnet This product was designed to be mounted inside the building envelope.
  • Page 6 Table 1 — VAV-RTU Open Inputs and Outputs CONNECTION PIN POINT NAME BACnet OBJECT NAME TYPE OF I/O CHANNEL DESIGNATION NUMBER(S) DEDICATED INPUTS Return Air Temperature ra_temp AI (10K Thermistor) J20- 3 and 4 Analog Input 11 Space Temperature AI (10K Thermistor) J20-1 and 2 Analog Input 10 Supply Air Temperature...

  • Page 7: Sensors And Accessories

    • Fan and/or Filter Status (CRSTATUS001A00, Sensors and Accessories CRSTATUS005A00) The VAV-RTU Open controller and i-Vu Open VAV zone control- lers are configurable with the following field-supplied sensors. User Interfaces Some may be wired directly to the VAV-RTU Open controller and •...
  • Page 8 Fig. 5 — VAV-RTU Open Control Wiring Diagram — 48LC*B07...
  • Page 9 Fig. 6 — VAV-RTU Open Control Wiring Diagram — 48LC*B08-12...
  • Page 10 Fig. 7 — VAV-RTU Open Control Wiring Diagram — 48LC*B14-26...
  • Page 11 Fig. 8 — VAV-RTU Open Control Wiring Diagram — 50LC*B07...
  • Page 12 Fig. 9 — VAV-RTU Open Control Wiring Diagram — 50LC*B08-12...
  • Page 13 Fig. 10 — VAV-RTU Open Control Wiring Diagram — 50LC*B14-26...

  • Page 14: Co2 Sensor(S) (Iaq And Oaq)

    Rnet Communicating Sensor Wiring RELATIVE HUMIDITY SENSORS (SPACE OR DUCT MOUNTED) The Rnet bus allows local communication with the VAV-RTU Open, including communicating sensors. The Rnet bus can sup- The accessory space humidity sensor or duct humidity sensor is port CO , RH or a combination of CO and RH wired directly to used to measure the relative humidity of the air within the space or...

  • Page 15: Differential Enthalpy

    BACnet over a sub-network of BACnet-only control- FIRE SHUTDOWN lers. This is the default Carrier communications protocol. Each VAV-RTU Open module acts as an MS/TP Master. The speed of The fire shutdown input is provided for unit shutdown in response an MS/TP network can range from 9600 to 76.8K baud.

  • Page 16: I-Vu Building Automation System

    Fig. 18 — Network Wiring I-VU BUILDING AUTOMATION SYSTEM Slaves i-Vu is a Carrier front-end and Building Automation System (BAS). It is a web based network system that uses a native BACnet over MS/TP communication protocol. The speed of the Master network can range from 9600 to 76,800 baud.

  • Page 17: Start-Up

    Final Test and Balance can be performed with Test and Balance software for system available from your local Carrier office. The Besides the base unit start-up, there are a few steps to take to prop- USB adapter and cable (USB-L) will also be required.

  • Page 18: Fan Test

    Service Test can be turned ON/OFF from Field Assistant, from the SETPOINT network, or from the Equipment or System Touch. Once turned Supply Air Setpoint ON, other entries may be made with the display or through the The user-defined base setpoint for Supply Air while in the Cooling network.
  • Page 19 Occupied Heating Low Fan Econ Min Pos Once a morning warm-up cycle is complete, Occupied Heating al- The minimum outdoor air damper position maintained during oc- lows the unit to return to heating, if needed. If Disable is selected, cupied periods when the fan is running at the minimum VFD the unit will not return to heating until the next occupancy cycle.
  • Page 20 Input for communicating sensor or Equipment Touch Terminal sensor J13 - 1, 2, 3, 4 NOTE: For Input 2, if using Carrier air quality sensors do not use Range = SPT Sensor, ZS Sensor, or Equipment Touch 24Vdc from VAV-RTU Open board. External 24Vdc power sup- Default = None ply required.

  • Page 21: Service Configuration

    SERVICE CONFIGURATION Indoor CO Sensor Value @max (ma) The CO value that corresponds to a 20mA input at the appropri- Compressor Stages ate input channel. The number of mechanical cooling stages. This decision is not Range = 0 to 9999 ppm configurable.

  • Page 22: Linkage Based Operation

    > occupied heating setpoint + 1 °F (0.5 °C)] if re- VAV-RTU Open supports Carrier Open air terminals with Airside set is enabled. If unoccupied, space temperature is > unoccu- Linkage or (VAV-RTU Open with version 2) can operate as a pied cooling setpoint).

  • Page 23: Economizer

    • Safety chain sensing device in both the outdoor and return air streams. A differ- ential enthalpy switch indicates when outside air is more suitable • SAT sensor alarm to be used than the return air and is available for economizer cool- •...

  • Page 24: Occupied Heating

    • Heating is required (Space temperature is < occupied heat- • The System Mode is Fan Only or IAQ Override Δ Δ ing setpoint – 1 °F (.5 °C). The unit has a valid Supply • The Outdoor Air Temperature < Minimum Cooling SAT Air Temperature input •...

  • Page 25: Fire Shutdown

    • Cooling – Air source fan is on and cooling is provided by Fire Shutdown economizer and mechanical cooling Fire Shutdown may be configured on Binary Input 5. A typical • Heating – Air source fan is on and heating is provided (gas application involves a smoke detector or fire shutdown contact, or electric) which, when active, immediately shuts down equipment...

  • Page 26: Continuous

    a configurable fan off delay that is upheld before shutting the fan cooling, if the SAT falls below the configured Minimum Cooling off after conditioning has ended. SAT value of 45°F (7.2°C), the economizer will modulate more open to maintain the minimum SAT. During integrated cooling, if CONTINUOUS the SAT falls below the configured Minimum Cooling SAT value When Fan Mode is set to Continuous, VAV-RTU Open will cycle...

  • Page 27: Enthalpy Control

    the supply airflow changes, the economizer minimum position is reset by the Space AQ algorithm, the System Mode displays IAQ adjusted to provide a constant amount of outdoor air. Override. When the fan operates at maximum speed, the economizer mini- The maximum amount the economizer may be opened to outdoor mum position will be set to the Vent Dmpr Pos / DCV Min Pos air by the Space AQ algorithm is limited by the DCV Max Vent...

  • Page 28: Occupied Heating

    OCCUPIED HEATING If the above are true, the VAV-RTU Open will monitor the IAQ sensor value and the OAQ sensor value if the option is provided. It Occupied Heating operates exactly the same as Morning Warm-up will compare those values to the IAQ setpoint and then calculate except that heating can occur any time during the occupied period.

  • Page 29: Compressor Safety (Standalone Mode)

    Compressor Safety (standalone mode) Thermistor Troubleshooting Compressor Safety may be configured on Binary Input 3. This VAV-RTU Open uses thermistors to sense temperatures for control feedback can be provided by a compressor. operation of the unit. Resistances at various temperatures are listed in Table 2.
  • Page 30 Communication LEDs The LEDs indicate if the controller is speaking to the devices on 12/10/2019 12:12:53 CM: 1 the network. The LEDs should reflect communication traffic Device Instance: 1610101 based on the baud rate set. The higher the baud rate the more solid the LEDs will appear.
  • Page 31 Table 4 — VAV-RTU Open Alarms (cont) ACTION TAKEN BY POINT NAME RESET METHOD PROBABLE CAUSE CONTROL Outdoor Air Temp Sensor Economizer and Low ambient Automatic Failure to receive valid local or network value for DX cooling lockout disabled. Outdoor Air Temperature Space Relative Humidity Dehumidification disabled Automatic...
  • Page 32 SPACE TEMP SENSOR OAQ SENSOR The SPT value from the Network or Airside Linkage is no longer This alarm indicates the mA input at the associated channel falls being received. When this occurs the Unit Status will be Shut- below 3.5 mA or rises above 21 mA, or the Network value for down and the System Mode will be Run.
  • Page 33 INDOOR AIR QUALITY Off, and clicking the OK button after each setting. Setting unit configuration Filter Service Alarm Timer value to 0 disables the This alarm indicates the space CO level exceeds the alarm con- filter service alarm function. figuration Occupied High CO Alarm Limit for 1-minute.
  • Page 34 RECORDED HIGH OAT ECONOMIZER UTILIZATION The highest value of OAT noted since the last reset occurred. This The value of the Economizer Utilization when the current perfo value will continue to update until Performance Data has been mance data was last reset. changed to Reset or will automatically reset every 24 hours at DCV UTILIZATION midnight if Save Performance Data Daily is set to Enable.
  • Page 35 APPENDIX A — USER INTERFACE MENUS Field Assistant Navigation Properties Equipment Status Configuration Unit Configuration Setpoints Alarm Configuration Service Configuration Maintenance Performance Alarms Linkage Fig. A — Field Assistant Navigation Chart Table A — User Interface Menus Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE...
  • Page 36 APPENDIX A — USER INTERFACE MENUS (CONT) Table A — User Interface Menus (cont) Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE DEFAULT Field Assistant Menu System Touch Menu 2 = USER 1 = None UNIT CONFIGURATION Property Pages>...
  • Page 37 APPENDIX A — USER INTERFACE MENUS (CONT) Table A — User Interface Menus (cont) Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE DEFAULT Field Assistant Menu System Touch Menu 2 = USER 1 = None INPUT CONFIGURATION Property Pages>...
  • Page 38 APPENDIX A — USER INTERFACE MENUS (CONT) Table A — User Interface Menus (cont) Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE DEFAULT Field Assistant Menu System Touch Menu 2 = USER 1 = None SETPOINTS Property Pages> Supply Air Setpoint 45 - 75°F Properties>...
  • Page 39 APPENDIX A — USER INTERFACE MENUS (CONT) Table A — User Interface Menus (cont) Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE DEFAULT Field Assistant Menu System Touch Menu 2 = USER 1 = None SERVICE CONFIGURATION (cont) Property Pages>...
  • Page 40 APPENDIX A — USER INTERFACE MENUS (CONT) Table A — User Interface Menus (cont) Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE DEFAULT Field Assistant Menu System Touch Menu 2 = USER 1 = None MAINTENANCE (UNIT) (cont) Property Pages>...
  • Page 41 APPENDIX A — USER INTERFACE MENUS (CONT) Table A — User Interface Menus (cont) Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE DEFAULT Field Assistant Menu System Touch Menu 2 = USER 1 = None MAINTENANCE (UNIT) (cont) Property Pages>...
  • Page 42 APPENDIX A — USER INTERFACE MENUS (CONT) Table A — User Interface Menus (cont) Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE DEFAULT Field Assistant Menu System Touch Menu 2 = USER 1 = None HISTORICAL PERFORMANCE DATA (cont) Full Load Cooling 0-100% Properties>...
  • Page 43 16 This input will only be shown if HPCO Shutdown is in alarm. This is the reset point for the alarm. 17 If using a Carrier Comfort Network (CCN) and BACnet System (i.e., Carrier CCN Air Terminal to BACnet Air Source), the Application ®...
  • Page 44 APPENDIX B — VAV ZONE AIRSIDE LINKAGE CONFIGURATION Table B — VAV Zone Airside Linkage Configuration Access Level Equipment Touch or 3 = ADMIN POINT NAME RANGE DEFAULT Field Assistant Menu System Touch Menu 2 = USER 1 = None AIRSIDE LINKAGE Air Terminal Linkage CollectorIf...
  • Page 45 CODE THIS DOCUMENT IS THE PROPERTY OF S U B M I S S I O N O F T H E S E CARRIER CORPORATION AND IS DELIVERED DRAWINGS OR DOCUMENTS UPON THE EXPRESS CONDITION THAT D O E S N O T C O N S T I T U T E...
  • Page 46 APPENDIX C — VAV ZONE CONTROLLER - SUBMITTAL EXAMPLE (CONT) E. Unoccupied time period: (reheat) cooling (determined by receiving a cooling signal from When the unoccupied period is reached, the user-defined the air source equipped with BACnet controls or a primary occupied heating set point is reset downward to a user- air temperature sensor is installed to detect the air source defined unoccupied heating set point.
  • Page 47 CODE THIS DOCUMENT IS THE PROPERTY OF S U B M I S S I O N O F T H E S E CARRIER CORPORATION AND IS DELIVERED DRAWINGS OR DOCUMENTS UPON THE EXPRESS CONDITION THAT D O E S N O T C O N S T I T U T E...
  • Page 48 APPENDIX D — BACnet POINTS LIST Table C — VAV-RTU Open Protocol Maps Point Default BACnet Point Name Units BACnet Point Name Access Value Object ID Active Cooling Stages no units et_comp_run AV:2020 Active Heat Stages no units heat_run AV:2003 Air Source Mode 1=Off link_ahu_mode...
  • Page 49 APPENDIX D — BACNET POINTS LIST (CONT) Table C — VAV-RTU Open Protocol Maps (cont) Point Default BACnet Point Name Units BACnet Point Name Access Value Object ID Factory Test Relay 3 Control Inactive (0) relay3_fac_test BV:91003 Factory Test Relay 4 Control Inactive (0) relay4_fac_test BV:91004...
  • Page 50 APPENDIX D — BACNET POINTS LIST (CONT) Table C — VAV-RTU Open Protocol Maps (cont) Point Default BACnet Point Name Units BACnet Point Name Access Value Object ID Occupancy Status occ_status BV:2008 Occupied Heating Inactive (0) occ_heat BV:2031 Outdoor Air Quality CO2 (ppm) AV:1012 Outdoor Air Quality Sensor oaq_fail...
  • Page 51 APPENDIX D — BACNET POINTS LIST (CONT) Table C — VAV-RTU Open Protocol Maps (cont) Point Default BACnet Point Name Units BACnet Point Name Access Value Object ID Supply Fan Relay State sfan BV:2001 Supply Fan Runtime sfan_rntm AV:2014 Supply Fan Runtime sfan_rntm_alarm BV:7010 Supply Fan Service Alarm Timer...
  • Page 52 APPENDIX E — EQUIPMENT/SYSTEM TOUCH NAVIGATION SCREENS The Equipment Touch™ interface is a touchscreen device with • mode a 4.3 inch color LCD display that can be connected to the VAV- • occupancy RTU Open controller to view or change its property values, •...
  • Page 53 APPENDIX E — EQUIPMENT/SYSTEM TOUCH NAVIGATION SCREENS (CONT) You can configure Show/Hide conditions for values on the Navigates to: following screens: • Alarm History • Standby • Home • Trends • Snapshot NOTE: Only shown when logged in with the Factory or Admin •...
  • Page 54 APPENDIX E — EQUIPMENT/SYSTEM TOUCH NAVIGATION SCREENS (CONT) ALARM HISTORY SCREEN Fig. I — Alarms Screen to navigate to the Alarms screen to navigate this screen.
  • Page 56 © 2020 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480277-01 Printed in U.S.A. Form 48-50LCB-7-26-01T Rev. A Pg 56 3-2020 Replaces: 48-50LCB-7-26-01T...
  • Page 57 RTU OPEN CONTROLLER START-UP SHEET RTU Model Number: Date: RTU Serial Number: Performed by: RTU Open Software Version: Company: Protocol and Baud Rate: Network Address: POINT NAME RANGE DEFAULT ENTRY UNIT CONFIGURATION Fan Mode 1 = Auto Continuous 2 = Continuous 3 = Always On Power Fail Restart Delay 0-30 sec...
  • Page 58 POINT NAME RANGE DEFAULT ENTRY INPUT CONFIGURATION (cont) Input 5 Function 1 = No Function Fire Shutdown 2 = Fire Shutdown 3 = Fan Status 4 = Filter Status 5 = Remote Occupancy 6 = Door Contact Input 5 Switch Configuration 1 = NO (Normally Open) 2 = NC (Normally Closed) Input 8 Function...
  • Page 59 POINT NAME RANGE DEFAULT ENTRY IAQ / VENTILATION ALARM Occ High CO Alarm Limit 0-9999 ppm 1200 SERVICE CONFIGURATION Compressor Stages Three Stages Economizer Exists Yes (FIOP) VFD Input 0-10Vdc/2-10Vdc 2-10Vdc Max VFD Output 15-100% Min VFD Output 15-100% Heat Type 0 = Electric (50 series units) 1 = Gas (48 series units) Number of Heat Stages...
  • Page 60 12 This configuration will only be shown if Input Configuration>Input 2 Function is set to 4 = OAQ Sensor 13 If using a Carrier Comfort Network (CCN) and BACnet System (i.e., Carrier CCN Air Terminal to BACnet Air Source), the Application ®...

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