Johnson Controls LX Series User Manual
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Johnson Controls LX Series User Manual

Johnson Controls LX Series User Manual

Ventilator controller
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LX Series Unit Ventilator Controller
User's Guide
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Sensor Configuration Wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Control Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
L
M
Functional Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ON
ARK
Units in L
W
ON
ORKS
Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Selecting a Measurement System or Selecting a Language . . . . . . . . . . . . . . . . . . . . . 16
Unit Ventilator Controller Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10k Ohm or Digital Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4 to 20 mA Analog Input, Externally Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Sensors and Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Auxiliary Alarm Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Bypass Contact Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CO
Level Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2
Discharge Temperature Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Economizer Enable Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Emergency Contact Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fan Speed Selector Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fan State Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Mixed Air Temperature Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Mode Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Occupancy Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Outdoor Enthalpy Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
LX Series Unit Ventilator Controller User's Guide
Code No. LIT-12011486
Issued June 22, 2009
1

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Summary of Contents for Johnson Controls LX Series

  • Page 1 Outdoor Enthalpy Input ........... . 24 LX Series Unit Ventilator Controller User’s Guide...

  • Page 2: Table Of Contents

    Heating Modulate (HEATING_MOD) ......... . 31 LX Series Unit Ventilator Controller User’s Guide...
  • Page 3 Free Cooling ............42 LX Series Unit Ventilator Controller User’s Guide...
  • Page 4 Integral ..............56 LX Series Unit Ventilator Controller User’s Guide...
  • Page 5 Levels ............. 78 LX Series Unit Ventilator Controller User’s Guide...
  • Page 6 ............89 LX Series Unit Ventilator Controller User’s Guide...
  • Page 7 SNVT_hvac_mode (108) ..........98 LX Series Unit Ventilator Controller User’s Guide...
  • Page 8 ..........106 LX Series Unit Ventilator Controller User’s Guide...

  • Page 9: Introduction

    LX Series Unit Ventilator Controller User's Guide Introduction The LX Series Unit Ventilator Controller (UVC) seamlessly integrates into a ® network for the control of almost any Unit Ventilator Controller due ORKS to its wide range of output types and L ®...

  • Page 10: Sensor Configuration Wizard

    Humidification and dehumidification sequences provide the UVC with the ability to maintain the space humidity at the desired level. The Unit Ventilator Controller also provides advanced control features often associated with air handlers. These features include Optimum Start and load shedding. LX Series Unit Ventilator Controller User's Guide...
  • Page 11 The precise Optimum Start period is calculated every day using the current outdoor air temperature. Functional Profile The LX Series Unit Ventilator Controller uses L network protocol and is ORKS certified for interoperability on any L network.
  • Page 12 P le a s e s e e th e m a n u a l fo r d e ta ils . W iz a rd fo r c o n fig u ra tio n p ro v id e d . Figure 1: LX Series Unit Ventilator Controller: Functional Profile...
  • Page 13 Object Major Version Output Signal Conditioning Object Minor Version PWM Period Input Signal Conditioning Hardware Properties Hardware Properties Default Value Translation Table Default Value Figure 2: LX Series Unit Ventilator Controller Inputs and Outputs LX Series Unit Ventilator Controller User's Guide...
  • Page 14 Variables SNVT _state_64 nvoUValarm SNVT _state_64 Manufacturer Configuration Properties Maximum Send Time Figure 3: LX Series Unit Ventilator Controller Node Object Type Units in L Networks ORKS Note: Use this section if you are using the Imperial System of measure.

  • Page 15: Language Selection

    Regional and Language Options dialog box. • You are working on a site that is in a linguistic region other than your own. • You are dissatisfied with the language displayed on program menus and dialog boxes. LX Series Unit Ventilator Controller User's Guide...

  • Page 16: Selecting A Measurement System Or Selecting A Language

    3. Under the list titled Pick a Task, select and open the second item titled Change the format of numbers, dates, and times (Figure 5). Figure 5: Date, Time, Language, and Regional Options Screen LX Series Unit Ventilator Controller User's Guide...
  • Page 17 1. For example, use 123,456,789.00, not 123 456 789,00. You must use a decimal point for the correct display of numerals. 6. In the Regional Options dialog box, click Customize. LX Series Unit Ventilator Controller User's Guide...
  • Page 18 You have now set the units to appear in the LX-UVL wizard. If you have chosen to display Imperial units, remember that the SNVTs are still using SI units. If you are viewing the data in Imperial units, you are viewing a converted, rounded value. LX Series Unit Ventilator Controller User's Guide...

  • Page 19: Unit Ventilator Controller Installation Overview

    Note: Because the Unit Ventilator Controller can connect to a maximum of six sensors, you may want to connect some sensors using the L ORKS network. All valid network inputs have priority over hardware inputs. LX Series Unit Ventilator Controller User's Guide...

  • Page 20: K Ohm Or Digital Input

    Both inputs are configured as 10 k Ohm or Digital Input Configuration could be done with either the LX - UVL wizard in or the Hardware Input Wizard Thermistor 10kOhm Contact NO -NC Figure 9: 10k Ohm or Digital Input LX Series Unit Ventilator Controller User's Guide...

  • Page 21: Analog Inputs

    Sensor Figure 10: Sensor Powered Analog Input LX- UVL I 2 I 3 – – – Ω − Resistor : ¼ Watt – Senso r O=ohm – Figure 11: Externally Powered Analog Input LX Series Unit Ventilator Controller User's Guide...

  • Page 22: Sensors And Switches

    Use switch closure on this input to cause the UVC to begin emergency operation. See the Emergency Operation section. Fan Speed Selector Input Fan speed selector gives the Unit Ventilator Controller the ability to select up to three different fan speeds. LX Series Unit Ventilator Controller User's Guide...

  • Page 23: Fan State Input

    Configures the fan ON during the scheduled occupied state. Heating and cooling is not available. Fan configuration is found on the Fan-Valve screen of the Unit Ventilator Controller configuration wizard. Disables the control loop to OFF. All outputs are in the OFF state. LX Series Unit Ventilator Controller User's Guide...

  • Page 24: Occupancy Input

    This input provides a means of varying the setpoint during occupied and standby modes. The values from this input are added to the pair of active setpoints. See the Calculating the Space Temperature Setpoint section. LX Series Unit Ventilator Controller User's Guide...

  • Page 25: Space Enthalpy Input

    Both inputs have priority over the hardware input; however, if both values are received, nviHotWater has priority over the nviWaterTemp. LX Series Unit Ventilator Controller User's Guide...

  • Page 26: Window Contact Input

    Setpoint Offset Input SNVT_temp SNVT_temp_f SNVT_temp_diff SNVT_temp_p Space Enthalpy Input SNVT_enthalpy Space Humidity Input SNVT_lev_percent Space Temperature Input SNVT_temp SNVT_temp_p SNVT_temp_f Water Temperature Input SNVT_temp SNVT_temp_p SNVT_temp_f Window Contact Input SNVT_lev_disc SNVT_occupancy SNVT_switch LX Series Unit Ventilator Controller User's Guide...

  • Page 27: Outputs

    1 ampere. The digital outputs work as a switch to control the current (Figure 13). The current source is separate from the transformers supplying the current for the UVC controller. LX Series Unit Ventilator Controller User's Guide...
  • Page 28 The override values are set during the configuration process. The configuration wizard provides a menu for issuing object commands, including the override command. See the Object Manage section for more information. LX Series Unit Ventilator Controller User's Guide...

  • Page 29: Staged Outputs

    Cooling outputs 1-4 are staged outputs, which are turned ON after cooling valve outputs, if any, are 100% open. Reversing Valve The reversing valve has two states. If the reversing valve is defined and is ON, then cooling outputs 1–3 act as heating outputs. LX Series Unit Ventilator Controller User's Guide...

  • Page 30: Humidifier And Dehumidifier Outputs

    These outputs operate cooling floating valves. Heat Cool Valve Open or Close These outputs operate heating-cooling floating valves according to the water temperature. Fan Speed Modulate (FAN_SPEED_MOD) Provides a variable speed fan control output. LX Series Unit Ventilator Controller User's Guide...

  • Page 31: Heating Modulate (Heating_Mod)

    Unoccupied heat and cool The network variable nviOccCmd commands the UVC to change modes according to the value of the variable. The value of nviOccCmd is changed by a schedule or other supervisory input. LX Series Unit Ventilator Controller User's Guide...

  • Page 32: Occupied Mode

    For example, if the window is opened, an unoccupied room remains unheated ensuring that heat and energy is not lost. Occupied Mode Occupied mode ensures the building environment is comfortable for building occupants. LX Series Unit Ventilator Controller User's Guide...

  • Page 33: Starting Occupied Mode

    It cannot begin if the Unit Ventilator Controller is currently in bypass mode. Unoccupied mode begins as result of one of the following events: • The unoccupied state is commanded by nviOccManCmd. This method could be used for a manual override. LX Series Unit Ventilator Controller User's Guide...

  • Page 34: Ending Unoccupied Mode

    Bypass time is set on the General Settings configuration screen. When the Unit Ventilator Controller enters bypass mode, the bypass time period begins; when the bypass time period ends, the Unit Ventilator Controller exits bypass mode. LX Series Unit Ventilator Controller User's Guide...

  • Page 35: Starting Bypass Mode

    Standby mode setpoints are entered during the Unit Ventilator Controller configuration. The Unit Ventilator Controller enters standby mode as a result of: • a scheduler node writing to nviOccCmd, or • an operator writing a command to nviOccCmd and/or nviOccManCmd LX Series Unit Ventilator Controller User's Guide...

  • Page 36: Ending Standby Mode

    When this connection is complete, the HMI or supervisory control sets the Unit Ventilator Controller to different states through nviApplicMode. For more information about nviApplicMode, see Table 28. LX Series Unit Ventilator Controller User's Guide...

  • Page 37: Calculating The Space Temperature Setpoint

    Example: If nviSetPoint is equal to 75°F (23.9°C) and the two setpoints are 72°F (22.2°C) and 68°F (20°C), then: ° ° − Setpoint_m F ° Setpoint_m The two setpoints become 77ºF (25ºC) and 73ºF (22.8°C). Note: The network variable nviSetPoint is inactive in unoccupied mode. LX Series Unit Ventilator Controller User's Guide...

  • Page 38: The Effect Of A Setpoint Offset On The Active Setpoints

    This means that the damper is moved to a position that meets the demands for fresh air without allowing more air to enter than is necessary. Free cooling is part of the cooling state and is described further in the Free Cooling section. LX Series Unit Ventilator Controller User's Guide...
  • Page 39 MAT Low Limit or SAT SAT Min Supply Temp. Min Supply Temp. Mixed Air Temperature Fresh air minimum Supply Air Temperature input Outside Air Temperature Return Air Temperature vent Figure 15: Ventilation Process LX Series Unit Ventilator Controller User's Guide...

  • Page 40: Control Of The Fresh Air Intake

    Fresh_Air_Damper_Mod, a modulated output. Min_Fresh_Air_Enable This digital output is not for direct use with modulating dampers. It is intended for use with an ON/OFF fresh air damper or automatic economizer control. LX Series Unit Ventilator Controller User's Guide...

  • Page 41: Humidity Control

    When you select any cooling output, it unlocks the Dehumidifying Settings. To dehumidify with a cooling coil, you must enter a minimum cooling override value and the fan speed override value. Dehumidification is more efficient if the air goes through the cooling coil slowly. LX Series Unit Ventilator Controller User's Guide...

  • Page 42: Cooling State

    0.43 Btu (1 kj/kg) below the space enthalpy. Free cooling is not available if the outdoor enthalpy exceeds the space enthalpy. Outdoor and space enthalpies are made available by the following methods: • using a network input LX Series Unit Ventilator Controller User's Guide...

  • Page 43: When Free Cooling Is Used

    The space temperature input data must be valid, or the Unit Ventilator Controller must be slaved to another unit. • The outdoor temperature must be greater than the Minimum Outdoor Temperature entered on the Heating-Cooling Configuration screen. LX Series Unit Ventilator Controller User's Guide...

  • Page 44: Cooling Demand

    Cooling outputs shut off when the bias reaches a negligible amount. However, if the PID loop control has accumulated bias during the cooling stage, cooling outputs may not shut off when the space temperature reaches the setpoint. LX Series Unit Ventilator Controller User's Guide...

  • Page 45: Heating States

    HEAT_COOL_VALVE_ON_OFF • HEAT_COOL_VALVE_OPEN • HEAT_COOL_VALVE_CLOSE • HEAT_COOL_VALVE_MOD The water is considered hot when the water temperature is warmer than the room temperature, or when nviHotWater receives a value and states different from zero. LX Series Unit Ventilator Controller User's Guide...

  • Page 46: Heating Demand

    Heating, Ventilating, and Air Conditioning (HVAC) device, an HMI, or a scheduling system. If frost protection is enabled, the heat turns ON if the temperature in the conditioned space reaches 42.8°F (6°C) and turns OFF at 46.4°F (8°C). LX Series Unit Ventilator Controller User's Guide...

  • Page 47: Morning Warm-Up State

    UVC commanding the first fan speed to turn ON. After this, the UVC starts or modulates all cooling and heating outputs to their maximum capacity according to their respective demands. Finally, all other fan speeds are started according to their respective demands. LX Series Unit Ventilator Controller User's Guide...

  • Page 48: Terminal Load

    The effect of the economizer damper may be included or excluded from the terminal load on the General Settings screen. The network variable nvoTerminalLoad transmits the terminal load of the controller over the network. LX Series Unit Ventilator Controller User's Guide...

  • Page 49: Heating Terminal Load

    Negative terminal load numbers represent the heating terminal load. Heating effort increases as the terminal load decreases. At 100% heating effort, the terminal load is -100% (Figure 18). Heating Terminal Load Heating Effort Time Figure 18: Heating Terminal Load LX Series Unit Ventilator Controller User's Guide...

  • Page 50: Cooling Terminal Load

    Cooling Terminal Load Cooling Effort Time Figure 19: Cooling Terminal Load LX Series Unit Ventilator Controller User's Guide...

  • Page 51: Networking Operations

    (LNS®) based software using the LonTalk® protocol and LNS services. Whereas the UVC can function without a network connection, the network variables sent and received over the LON by the controller can affect all of its operations. LX Series Unit Ventilator Controller User's Guide...

  • Page 52: Network Outputs

    EEPROM. Because EEPROM can only accept a limited number of data writes, be careful how you use the persistent attribute. See the Persistent Network Variables section for more information. LX Series Unit Ventilator Controller User's Guide...

  • Page 53: Optimum Start

    Requirements for Optimum Start The next state and time to the mode must be defined in advance. There must be a scheduler and the schedule must be properly bound to the Unit Ventilator Controller using nviOccCmd. LX Series Unit Ventilator Controller User's Guide...

  • Page 54: Emergency Operation

    Emergency Purge: An emergency purge stops the fan, stops any heating or cooling, and fully opens the fresh air damper. • Emergency Shutdown: An emergency shutdown stops the fan, stops any heating or cooling action, and closes the fresh air damper. LX Series Unit Ventilator Controller User's Guide...

  • Page 55: Emergency Initiation

    The difference between the input and the setpoint is called the error. The controller output is a function of the error. Sensor Space Output Controller Setpoint Figure 20: PID Controller with Input, Setpoint, and Output LX Series Unit Ventilator Controller User's Guide...

  • Page 56: Proportional

    3F°. If the gain is equal to 10% per °F, then the output is 30% of the maximum output value. Integral The integral component has a gain and time setting. These work together to remove errors that accumulate over time. LX Series Unit Ventilator Controller User's Guide...

  • Page 57: Gain

    Heat is ON 8:00 8:30 9:0010:00 Time Figure 23: Never Quite Warm Enough: Using Only a P Controller In Figure 23, the temperature never quite falls low enough to turn on the proportional heat. LX Series Unit Ventilator Controller User's Guide...

  • Page 58: Derivative

    Centigrade or Fahrenheit degree. If 50 is entered into the Gain box, then each unit of error causes a 50% increase in derivative control output. LX Series Unit Ventilator Controller User's Guide...

  • Page 59: Time

    Figure 25: Effect of Deadband upon PID Loop Error When you use deadbands, it reduces mechanical wear and tear on moving parts because the mechanical parts no longer oscillate to accommodate trivial errors. LX Series Unit Ventilator Controller User's Guide...

  • Page 60: Alarm Operation

    In addition to the preceding user-set alarms, other alarms are provided. These include: • heartbeat alarms for network inputs • disconnect alarms for sensor points • emergency mode alarm Figure 26: Alarm Configuration Screen LX Series Unit Ventilator Controller User's Guide...

  • Page 61: Alarm Features

    Alarm Delay Displays the period of time that the monitored variable must be in the alarm state before an alarm message is generated. See Figure 27 and Figure 28. LX Series Unit Ventilator Controller User's Guide...

  • Page 62: Alarm Types

    The network variable nvoUnitStatus transmits information about the unit ventilator object. The following text sorts the alarms by type, describes the conditions that generate an alarm, and organizes the associated bits of the nvoStatus and nvoUValarm into a table. LX Series Unit Ventilator Controller User's Guide...

  • Page 63: Heartbeat Alarms

    UNVT_uv_alarms that relays the status of the object. If a heartbeat alarm comes ON, a communication failure alarm sounds. The Bit #13 of nvoStatus, programmatic name comm_failure, turns ON. Table 11 describes Heartbeat Alarms. LX Series Unit Ventilator Controller User's Guide...
  • Page 64 Command Slave Input nviSlave SCPTmaxRcvTime nviSlaveHeartBeat Space Enthalpy nviSpaceEnth SCPTmaxRcvTime nviSpaceEnthHeartBeat Space Humidity nviSpaceRH SCPTmaxRcvTime nviSpaceRHHeartBeat Space nviSpaceTemp SCPTmaxRcvTime nviSpaceTempHeartBeat Temperature Water nviWaterTemp SCPTmaxRcvTime nviWaterTempHeartBeat Temperature Water nviHotWater SCPTmaxRcvTime nviHotWaterHeartBeat Temperature State (Hot/Cold) LX Series Unit Ventilator Controller User's Guide...

  • Page 65: Disconnect Alarms

    UNVT_rt_alarm that relays the status of the object. If a user-set alarm comes ON, an out of limits alarm sounds. The Bit #4 of nvoStatus, programmatic name out_of_limits, turns ON. LX Series Unit Ventilator Controller User's Guide...

  • Page 66: Setting Up The Unit Ventilator Controller

    The following information is in the same order as it appears in the Unit Ventilator Controller configuration wizard. Persistent Network Variables Note: Read this section about how to make network variables persistent. This information could save you a great deal of time. LX Series Unit Ventilator Controller User's Guide...

  • Page 67: Setting Units

    SNVT that transmits the information over the network. You can configure inputs through the sensor configuration wizard. The sensor configuration wizard can be launched from both the Unit Ventilator Controller configuration wizard and the Hardware Input functional block. LX Series Unit Ventilator Controller User's Guide...

  • Page 68: Output Configuration

    Cooling control output, stage 2 LOCAL_COOLING_3 Cooling control output, stage 3 LOCAL_COOLING_4 Cooling control output, stage 4 REVERSING_VALVE Two state (opened or closed) reversing valve output HUMIDIFIER_ON_OFF Humidifier control output DEHUMIDIFIER_ON_OFF Dehumidifier control output LX Series Unit Ventilator Controller User's Guide...

  • Page 69: Output Signal Types

    To select and configure an output: 1. On the Output screen, numbers in the column Control Output correspond to the output numbers. Click the drop-down arrow next to the control output number that you want to configure. LX Series Unit Ventilator Controller User's Guide...
  • Page 70 0% of the rated voltage when ON, select the Reverse box. For a digital output, the output is normally ON when the contacts are closed. When you reverse a digital output, the output is ON when the contacts are open. You have now configured an output. LX Series Unit Ventilator Controller User's Guide...

  • Page 71: Configuring An Output Represented As A Functional Block

    The default values are used when the Unit Ventilator Controller is in the default state. The Unit Ventilator Controller may enter the default state at startup. The state that the Unit Ventilator Controller enters at startup is selected during commissioning. LX Series Unit Ventilator Controller User's Guide...

  • Page 72: Heating-Cooling Configuration

    • maximum and minimum discharge temperatures • economize maximum outdoor temperature and enthalpy • change over delay • mechanical cooling minimum operating times (Figure 32) LX Series Unit Ventilator Controller User's Guide...

  • Page 73: Optimum Start

    Once a staged output has changed state, the next staged output cannot change state until the minimum heating time has passed. Note: Minimum Heating Time does not apply to modulated heating. LX Series Unit Ventilator Controller User's Guide...

  • Page 74: Fan-Valve Configuration

    The time interval that must pass before heating can occur after cooling or Over cooling can occur after heating. Fan-Valve Configuration On this screen, you select the type of fan input, fan operation, and floating valve operating properties (Figure 33). LX Series Unit Ventilator Controller User's Guide...
  • Page 75 Drive Time for Floating Valves Displays the period of time required for the valve to move from the fully closed to the fully open position. LX Series Unit Ventilator Controller User's Guide...

  • Page 76: Pid Configuration

    If this option is unchecked, the Unit Ventilator Controller tries to maintain the calculated discharge temperature setpoint. The discharge setpoint is calculated with a linear equation between the minimum and maximum discharge air temperature and the space PID loops. LX Series Unit Ventilator Controller User's Guide...

  • Page 77: Alarm Configuration

    In this case, the alarm becomes active when both of the following conditions are present: • The monitored temperature is outside of the range bounded by the setpoint plus or minus the alarm offset. LX Series Unit Ventilator Controller User's Guide...

  • Page 78: Discharge Temperature And Auxiliary Alarm

    The alarm delay must be long enough to allow the fan to reach the ON or OFF stage. The fan speed or fan current level is set in the Fan-Valve Configuration screen. LX Series Unit Ventilator Controller User's Guide...

  • Page 79: General Settings Configuration

    The fresh air minimum is calculated using return air temperature, mixed air temperature, and outside air temperature. Damper Drive Time Enter the time required for the damper drive to move the damper from fully open to fully closed. LX Series Unit Ventilator Controller User's Guide...

  • Page 80: Radiation Heating

    If you select Radiation First, the valve and/or heating outputs start first on a heating demand. If the option Ventilation Only is selected, the fan must be ON in order to start any heating outputs. LX Series Unit Ventilator Controller User's Guide...

  • Page 81: Options Configuration

    Note: For Optimum Start to work, the network variable nviOccCmd must be set to SNVT type SNVT_tod_event. Use the Changeable Nv Manager view of the device in FX Workbench to change the SNVT type. LX Series Unit Ventilator Controller User's Guide...

  • Page 82: Frost Protection

    Note: Humidifier/Dehumidifier ON/OFF time does not apply to modulated humidifier and dehumidifier outputs. Enable Dehumidifying Cycle Enables the dehumidifier using the cooling coil. Disable in Heating Mode Disables the dehumidifier using the cooling coil in heating mode. LX Series Unit Ventilator Controller User's Guide...

  • Page 83: Network Input Configuration

    Do not make frequently changing network variables persistent. Heartbeat Alarms An alarm occurs if the period between received values of these variables exceeds the value you enter into the Heartbeat column. For more information, see the Alarm Operation section. LX Series Unit Ventilator Controller User's Guide...

  • Page 84: Network Output Configuration

    Send on Delta quantity • throttle settings for several network outputs You can also set the maximum send time and minimum send time for all other network variables (Figure 39). Figure 39: Network Output Configuration Screen LX Series Unit Ventilator Controller User's Guide...

  • Page 85: Object Manage

    FX supervisory controller (Figure 40). Table 26 describes the parameters. Figure 40: Object Manage Object Status Object Status messages are listed in the following sections with references to tables describing the causes. LX Series Unit Ventilator Controller User's Guide...
  • Page 86 Update alarm status. RQ_REPORT_MASK Report status bit mask. RQ_OVERRIDE Override object. RQ_ENABLE Enable object. RQ_RMV_OVERRIDE Remove object override. RQ_CLEAR_STATUS Clear object status. RQ_CLEAR_ALARM Clear object alarm. RQ_ALARM_NOTIFY_ENABLED Enable alarm notification. RQ_ALARM_NOTIFY_DISABLED Disable alarm notification. LX Series Unit Ventilator Controller User's Guide...

  • Page 87: Communication Failure

    (nviSlave). Network Variables The following text describes some of the most commonly used network variables found in the Unit Ventilator Controller. LX Series Unit Ventilator Controller User's Guide...

  • Page 88: Nviapplicmode

    This network variable input receives the economizer enable demand. When the state and value are not set to zero, the economizer is enabled. When the state or value is set to zero, the water state is disabled. Type: SNVT_hvac_emerg LX Series Unit Ventilator Controller User's Guide...

  • Page 89: Nviemergcmd

    This network variable input receives the fan state. When state and value are not set to zero, the fan state is considered ON. When state or value is set to zero, the fan state is considered OFF. Type: SNVT_switch (95) LX Series Unit Ventilator Controller User's Guide...

  • Page 90: Nvihotwater

    Used to receive the outdoor enthalpy. Network values have priority over local sensor values. Type: SNVT_enthalpy (153) nviOutdoorRH Used to receive the outdoor air humidity. Network values have priority over local sensor values. Type: SNVT_lev_percent (81) LX Series Unit Ventilator Controller User's Guide...

  • Page 91: Nvioutdoortemp

    It is normally bound to the nvoUnitStatus of the other Unit Ventilator Controller. Type: SNVT_hvac_status (112) nviSpaceEnth Transmits space enthalpy from a network device to the UV. Network values have priority over local sensor values. Type: SNVT_enthalpy (153) LX Series Unit Ventilator Controller User's Guide...

  • Page 92: Nvispacerh

    100%, respectively. Economizer control is disabled when state and value fields are set to zero. Type: SNVT_switch (95) nvoEffectSetPt This network variable output sends the effective setpoint in use by the fan coil object. Type: SNVT_temp_p (105) LX Series Unit Ventilator Controller User's Guide...

  • Page 93: Nvofanspeed

    Heartbeat failure has occurred in nviOutdoorRH. nviCO2HeartBeat Heartbeat failure has occurred in nviCO2. nviReturnTempHeartBeat Heartbeat failure has occurred in nviReturnTemp. nviMixAirTempHeartBeat Heartbeat failure has occurred in nviMixAirTemp. nviSpaceEnthHeartBeat Heartbeat failure has occurred in nviSpaceEnth. LX Series Unit Ventilator Controller User's Guide...
  • Page 94 HighSpaceRH The space humidity is higher than a setpoint by more than humidity offset for a time period longer than the alarm delay. LX Series Unit Ventilator Controller User's Guide...

  • Page 95: Nvouvstate

    DupDischrgTempCfgError Duplicate discharge air temperature sensor configuration error. DupOutTempTempCfgError Duplicate outdoor air temperature sensor configuration error. DupMixAirTempCfgError Duplicate mixed air temperature sensor configuration error. DupWaterTempCfgError Duplicate water temperature sensor configuration error. LX Series Unit Ventilator Controller User's Guide...

  • Page 96: Nvospacetemp

    Heating stages configuration error. CoolStagesCfgError Cooling stages configuration error. RevValvWOCoolCfgError Reversing valve without cooling stages configuration error. nvoSpaceTemp This network variable output sends the space temperature used by the fan coil object. Type: SNVT_temp_p (105) LX Series Unit Ventilator Controller User's Guide...

  • Page 97: Nvoterminalload

    • secondary heating state (if relevant) as a percentage • cooling state as a percentage • fan state as a percentage • unit ventilator alarm state Type: SNVT_hvac_status (112) LX Series Unit Ventilator Controller User's Guide...

  • Page 98: Standard Network Variable Types (Snvts)

    Description SNVT Index Measurement hvac_t Field Type Category Enumeration Type Size 1 byte Valid Type Range hvac_t Type Resolution Units Invalid Value HVAC_NUL Raw Range hvac_t Scale Factor File Name SNVT_HV.H Default Value LX Series Unit Ventilator Controller User's Guide...

  • Page 99: Snvt_Hvac_Status (112)

    Description Field mode Measurement hvac_t Field Type Category Enumeration Type Size 1 byte Valid Type Range hvac_t Type Resolution Units Invalid Value HV_NUL Raw Range hvac_t Scale Factor File Name SNVT_HV.H Default Value LX Series Unit Ventilator Controller User's Guide...
  • Page 100 -163.840 – 163.830 Type Resolution 0.005 Units Percent of full scale Invalid Value 32,767 (0x7FFF) Raw Range -32,768 – 32,766 0x7FFE Scale Factor 5, -3, 0 S = a*10b*(R+c) File Name Default Value LX Series Unit Ventilator Controller User's Guide...
  • Page 101 Units Percent of full scale Invalid Value 32,767 (0x7FFF) Raw Range -32,768 – 32,766 (0 x 8000 – 0 x 7FFE) Scale Factor 5, -3, 0 S = a*10b*(R+c) File Name Default Value LX Series Unit Ventilator Controller User's Guide...

  • Page 102: Alarm State

    Type Size 1 byte Valid Type Range 0-255 Type Resolution Units Alarm Value Invalid Value Raw Range 0-255 (0x00 – 0xFF) Scale Factor 1, 0, 0 S = a*10b*(R+c) File Name Default Value LX Series Unit Ventilator Controller User's Guide...

  • Page 103: Snvt_Lev_Percent (81)

    Description SNVT Index Measurement occup_t Field Type Category Enumeration Type Size 1 byte Valid Type Range occup_t Type Resolution Units Invalid Value OC_NUL Raw Range occup_t Scale Factor File Name SNVT_OC.H Default Value LX Series Unit Ventilator Controller User's Guide...

  • Page 104: Snvt_Ppm (29)

    OFF state if value = 0. In addition, a SNVT_switch input network variable with state = FALSE should be interpreted as the OFF state, whether or not value = 0. A state value of 0xFF indicates the switch value is undefined. LX Series Unit Ventilator Controller User's Guide...
  • Page 105 Field Type Category Signed Short Type Size 1 byte Valid Type Range Type Resolution Units Invalid Value -1 (0xFF) Raw Range Scale Factor 1, 0, 0 S = a*10 *(R+c) File Name Default Value LX Series Unit Ventilator Controller User's Guide...

  • Page 106: Snvt_Temp_P (105)

    SNVT Index Current_state Measurement occup_t Field Type Category Enumeration Type Size 1 byte Valid Type Range occup_t Type Resolution Units Invalid Value OC_NUL Raw Range Occup_t Scale Factor File Name SNVT_OC.H Default Value LX Series Unit Ventilator Controller User's Guide...
  • Page 107 507 E. Michigan Street, Milwaukee, WI 53202 Johnson Controls® is a registered trademarks of Johnson Controls, Inc. All other marks herein are the marks of their respective owners. © 2009 Johnson Controls, Inc. LX Series Unit Ventilator Controller User's Guide Published in U.S.A.

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