valent VX Series Reference Manual

Microprocessor controller for dedicated outdoor air system

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Reference Guide for Microprocessor Controller
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
DOAS v4.001
Program Features
The microprocessor controller offers control through
easy monitoring and adjustment of unit parameters by
way of a lighted graphical display and an integral push-
button keypad.
Pre-Programmed Operating Sequences
The controller has been pre-programmed to offer
multiple control sequences to provide tempered air.
Factory default settings allow for easy setup and
commissioning. The sequence parameters are fully
adjustable. Refer to the Sequence of Operation for
details.
BMS Communication
The user can remotely adjust set points, view unit
status points and alarms. The microprocessor
controller is capable of communicating over several
protocols:
• BACnet® MSTP
• BACnet® IP
• LonWorks®
Reference Points List for a complete list of BMS points.
Built-In Occupancy Schedule
The controller has an internal programmable time clock,
allowing the user to set occupancy schedules for each
day of the week. The controller option also has morning
warm-up and cool down capability for improved
comfort at the time of occupancy.
Alarm Management
The microprocessor controller will monitor the unit's
status for alarm conditions. Upon detecting an alarm,
the controller will record the alarm description, time,
date, and input/output status points for user review. A
Introduction
• Modbus RTU
• Modbus TCP
Valent VX Series Controller for
Dedicated Outdoor Air System
Technical Support
Call 1-866-478-2574
digital output is reserved for remote alarm indication.
Alarms are also communicated via BMS (if equipped).
Occupancy Modes
The microprocessor controller offers three modes of
determining occupancy: a digital input, occupancy
schedule or the BMS. If in the unoccupied mode, the
unit will either be shut down, continue normal operation
utilizing adjustable unoccupied set points, recirculate
with unoccupied set points or will cycle on to maintain
adjustable unoccupied space temperature and humidity
set points (space temperature and humidity sensor is
optional).
Remote Unit Access (if equipped)
The WebUI and Remote Display are two ways to gain
access to the unit controller allowing monitoring of the
unit and parameter adjustment without being at the
unit.
The WebUI can be accessed via a building network
and is included with every unit controller. The Remote
Display is an LCD to be panel mounted in a remote
location and is an option available for purchase.
WARNING
Electrical shock hazard. Can cause personal injury or
equipment damage. Service must be performed only
by personnel that are knowledgeable in the operation
of the equipment being controlled.
WARNING
Mechanical high static protection cutoffs must
be installed by others to protect the system and
equipment from over-pressurization when using
factory provided control sensors. The manufacturer
does not assume responsibility for this.
Document 484280
Valent VX Series Controller
1

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Summary of Contents for valent VX Series

  • Page 1 Document 484280 Valent VX Series Controller for Dedicated Outdoor Air System Reference Guide for Microprocessor Controller Please read and save these instructions for future reference. Read carefully before attempting to assemble, install, operate or maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with these instructions will result in voiding of the product warranty and may result in personal injury and/or property damage.
  • Page 2: Table Of Contents

    E: Points List ....43-54 F: Modbus Connections ....55 Our Commitment ... . . Backcover Valent VX Series Controller...
  • Page 3: Sequence Of Operation

    The supply air temperature falls below the soft º Supply fan on shutdown enable set point minus 5.0°F; or º Recirculation air damper open – The soft shutdown delay timer has expired. º OA damper closed º Tempering operations begin Valent VX Series Controller...
  • Page 4 (50%+5%). The supply air temperature set point will be set to the • Mechanical Cooling: Microprocessor controller equivalent occupied supply set point. enables stages of cooling to maintain the supply air Valent VX Series Controller...
  • Page 5 The stay within 2ºF of set point. saturated suction temperature, the outside ambient temperature and/or the outside humidity determine when a defrost initiates and terminates. Valent VX Series Controller...
  • Page 6 The factory installed VFD is wired to the controller. • 0-10 VDC by Others to VFD: The exhaust fan is Supply fan speed needs to be set during test enabled by the unit controller. An external field- Valent VX Series Controller...
  • Page 7 (300 sec.). • Modulate Wheel: When economizer mode is • Other Alarms: Wheel Rotation, High Wheel Pressure, enabled and there is a call for cooling, the controller High/Low Refrigerant Pressure. Valent VX Series Controller...
  • Page 8: Controller Overview

    NO13 ID14 2 Speed Fan Input ID17 ID14H NC13 2 Position Damper Input ID18 IDC17 Optional LonWorks cards are Optional Modbus RTU/BACnet MSTP connections located in BMS Card port. are made to the J25 BMS2 terminal. Valent VX Series Controller...
  • Page 9 IDC13 Condenser Fan Ramp 2 - Stage 3 Start NO13 Remote Start Input ID14 ID14H NC13 Optional LonWorks cards are Optional Modbus RTU/BACnet MSTP connections located in BMS Card port. are made to the J25BMS2 terminal. Valent VX Series Controller...
  • Page 10 Preheater Enable Space Static Pressure Supply Air Duct Static Pressure Space Set Point Adjustment The expansion board is an I/O module than can be used to monitor additional statuses or provide commands from medium board controller. Valent VX Series Controller...
  • Page 11 Main Gas Valve - Small Manifold Main Gas Valve - Large Manifold High Speed Fan Ignition Controller Alarm 24 VAC 24 VAC for Analog Outputs Ignition Controller - Large Manifold Modulating Gas Valve 24 VAC Modbus Connection Modbus Address Switches Valent VX Series Controller...
  • Page 12: Display Use

    When finished, make certain the cursor is in the upper left corner. If the cursor is below: 32.0º F not in the upper left corner, the changes will not be saved. The cursor must be in Alarm delay: 300s the upper left corner to enable screen advancement. Valent VX Series Controller...
  • Page 13: Web User Interface

    Upgrade Application - A new application program can be loaded to the controller via the WebUI. Unit Display Web User Interface Web User Interface Logged in with Service, red boxes will appear after logging in. Valent VX Series Controller...
  • Page 14: Main Menu

    Reference the Advanced menu Backup/Restore section for more information. IO Status/Offset* *Consult IO Config factory for more information. Service Config Unit Config* Factory Config Unit Settings* Service Info* Alarm Shutdown Management Alarms General Alarms Valent VX Series Controller...
  • Page 15: Unit Status Overview

    VFD. The min and max speeds are set in the VFD (Reference unit Installation and Operation Manual for VFD programming). The controller can modulate the fan between the min and max speeds via an analog output. Valent VX Series Controller...
  • Page 16 Ramp Output screen will be active if the unit is configured for CO control. This screen displays the CO set point, CO level from the space, and the status of the control ramp. nergy ecovery heel TaTus This screen provides overall status of the energy recovery wheel. Valent VX Series Controller...
  • Page 17 This screen provides information regarding the outside fan ramp status, circuits affected by the ramp, the status of the fans, and the set point, offset and current saturated temperature. Valent VX Series Controller...
  • Page 18 The condition screens are active when both temperature and humidity sensors for the location are installed in the unit. The enthalpy and dew point are calculated based on the temperature and humidity readings. The unit altitude is used for the enthalpy calculation. Valent VX Series Controller...
  • Page 19: Unit Enable

    A visual representation of the OA reset function is shown below. Reference Outside Set points for min and max outside air limits. Outdoor Air Reset Function 75° 70° 65° 60° 55° 50° 45° 50° 55° 60° 65° 70° Outside Air Temperature (°F) Valent VX Series Controller...
  • Page 20 This screen only appears if outside reset is selected as the reset control mode. wiTch isplay This screen displays the delay time required before switching between heating and cooling mode. TarTup isplay This screen displays the delay time after the fans have started and tempering begins Valent VX Series Controller...
  • Page 21 The quantity of thermostats installed in the space that communicate the temperature, humidity, and set point to the controller. The controller averages the temperature and humidity readings when there is more than one installed. See Appendix C for more information. Valent VX Series Controller...
  • Page 22: Dehumidification

    When the demand is high, the temperature is low. If a constant temperature off the coil is desired during dehumidification, the min and max can be set to the same value. If a BMS is available, the set points can be adjusted over the BMS. Valent VX Series Controller...
  • Page 23 To disable this operation and allow the compressor to cycle in dehumidification mode, uncheck the applicable cooling ramps. Valent VX Series Controller...
  • Page 24: Refrigeration

    OA set point, which may be constant or reset by fan speed if equipped with a modulating supply fan. The OA damper set point can then be further adjusted between the min and max OA settings with sequences such as DCV CO , Building Pressure and Economizer. Valent VX Series Controller...
  • Page 25 Comparative Dry Bulb - Economizing is allowed when outside temperature is less than the space or return temperature. Comparative Enthalpy - Economizing is allowed when outside enthalpy is less than the space or return enthalpy. Valent VX Series Controller...
  • Page 26: Energy Recovery

    This screen display the energy recovery wheel jog function. This screen only appears if the unit has an energy recovery wheel and stop wheel economizer method for control. Momentarily enables the wheel in order to expose a new section to the airstream. Valent VX Series Controller...
  • Page 27: Fan Control

    • Tempering outputs immediately revert back to their off value; while • Dampers remain open and fans continue to run; until - The supply air temperature falls below the soft shutdown enable set point minus 5ºF; or - The soft shutdown delay timer has expired. Valent VX Series Controller...
  • Page 28 An offset can be added to achieve the proper balance. Outside Air Damper Tracking – The exhaust fan will proportionally track the OA damper, between a min and max position. Return Duct Static Pressure – Fan speed is determined by duct pressure control loop. Valent VX Series Controller...
  • Page 29: Occupancy

    This screen only appears if unit is provided with unoccupied recirculation. This screen allows the user to enable/disable modes of operation when in unoccupied recirculation control. ccupancy imed verride Screen allows the user to override occupancy for a set duration. Valent VX Series Controller...
  • Page 30: Advanced

    The speed is the proportional percentage of the analog output from the controller to the VFD. 0% Speed = Min speed (determined by VFD) 100% Speed = Max speed (determined by VFD) (Reference unit Installation and Operation Manual for VFD programming). Valent VX Series Controller...
  • Page 31 The compressors are subject to the min on/off times and heating/cooling lockouts. verride The lecTric eaTer This screen only appears if the unit is equipped with electric post heat. Electric heater percentage is directly proportional to the 0 – 10 VDC output signal. Valent VX Series Controller...
  • Page 32 The Advanced Setpoints Menus allows the user to view and modify network settings. The service password (9998) is required to make changes. Advanced Advanced Setpoints ccupied ehumidiFicaTion Reference control variables for possible Occupied dehumidification call methods. noccupied ehumidiFicaTion Reference control variables for possible unoccupied dehumidification call methods. Valent VX Series Controller...
  • Page 33 Press enter to accept adjusted value. 3. Once desired parameters have been entered, enable the ‘Save Settings’ option and press the enter button. 4. Reboot the controller by cycling power to the unit. Allow several minutes for the controller to initialize. Valent VX Series Controller...
  • Page 34 The controller has built-in USB ports for connecting to USB drives. The USB drives can be used for backing up all settings and reported conditions such as alarm history and current values. This creates a file named User_Backup.txt. USB Type A USB Type B Valent VX Series Controller...
  • Page 35 5. Press Enter to highlight and then the Up or Down arrow buttons to fill the Restore checkbox. This action restores the backup file. If there is an error during the process, the specific error is displayed on this screen. 6. Cycle power to the controller. Valent VX Series Controller...
  • Page 36 Configuration menus listed below can be altered with the Advanced service password. Consult factory for unit configuration changes! Unit Config Service Config upply onTrol Reference control variables for possible supply fan control methods. xhausT onTrol Reference control variables for possible exhaust fan control methods. Valent VX Series Controller...
  • Page 37: Alarms

    Alarm only Check for high limit trip. IG offline Indicates communication with furnace control has failed. Alarm only IG Lg Man No Flame AL No flame after 3 trials for ignition on the large manifold. Alarm only Valent VX Series Controller...
  • Page 38: Appendix A: Remote Display

    1 2 3 4 5 6 through cable,” where pins on one end correspond identically to the pins on the opposite end. If making your own cable, use the same pin-out for each end. NTC Temperature Sensor Chart Resistance (kΩ) Valent VX Series Controller...
  • Page 39: B: I/O Expansion Board Quick Start

    I/O expansion board. See example to the left. Viewing c.PCOe Auxiliary Values – Once the expansion board I/O is configured, the user can view and/or change the I/O type by navigating to Ctrl Variables/Aux I/O Config. Valent VX Series Controller...
  • Page 40: C: Space Thermostat Quick Start

    “Network” LED should be a quick blinking amber/green color. • In the Controller, enter the Ctrl Variables Menu/Temperature and scroll down in the Temperature Menu to select Space Thermostat. Choose the number of space sensor being used (1-4). Valent VX Series Controller...
  • Page 41 • To adjust the temperature override time, enter the following menu options at the controller, Ctrl Variables/Occupancy. Scroll down at the Occupancy Menu and select Occ Timed Override. This menu will allow the user to enable occupancy override from the controller and set override duration. Valent VX Series Controller...
  • Page 42: D: Greentrol ® Airflow Monitoring Quick Start

    Up/Down Button Function - The Up/Down buttons are used to navigate the menu and to change values in the menu. Esc Button Function - The ESC button allows the user to exit the current menu or function. Valent VX Series Controller...
  • Page 43: E: Points List

    Customer defined auxiliary ReadCOV_ Aux_In_Customer_3 30643 Input input NoWrite Customer defined auxiliary ReadCOV_ Aux_In_Customer_4 30645 Input input NoWrite Customer defined auxiliary ReadCOV_ Aux_In_Customer_5 30647 Input input NoWrite Customer defined auxiliary ReadCOV_ Aux_In_Customer_6 30649 Input input NoWrite Valent VX Series Controller...
  • Page 44 BMS. Cooling_Lockout_Set Cooling Ambient Lockout ReadCOV_ 40061 Holding Point Set Point Commandable Heating_Lockout_Set Heating Ambient Lockout ReadCOV_ 40063 Holding Point Set Point Commandable Space_Static_ Space Static Pressure Set ReadCOV_ 40073 Holding Pressure_Set Point Point Commandable Valent VX Series Controller...
  • Page 45 Holding Output_2 analog output Commandable Aux_BMS_Analog_ BMS Commanded auxilary ReadCOV_ 40097 Holding Output_3 analog output Commandable Aux_BMS_Analog_ BMS Commanded auxilary ReadCOV_ 40099 Holding Output_4 analog output Commandable Cooling_Coil_Setpoint_ Maximum Coil Leaving ReadCOV_ 40101 Holding Setpoint Commandable Valent VX Series Controller...
  • Page 46 NoWrite ReadCOV_ Outside_Enthalpy Outside Enthalpy 30087 Input NoWrite ReadCOV_ Return_Dewpoint Return Dewpoint 30093 Input NoWrite ReadCOV_ Return_Enthalpy Return Enthalpy 30095 Input NoWrite ReadCOV_ Space_Dewpoint Space Dewpoint 30097 Input NoWrite ReadCOV_ Space_Enthalpy Space Enthalpy 30099 Input NoWrite Valent VX Series Controller...
  • Page 47 Discharge Temperature NoWrite Temperature Circuit_B_Sat_ Circuit B Saturated ReadCOV_ Discharge_ 30589 Input Discharge Temperature NoWrite Temperature Circuit_A_Sat_ Circuit A Saturated Suciton ReadCOV_ 30603 Input Suction_Temperature Temperature NoWrite Coil_Temperature_ Calculated Coil Leaving ReadCOV_ 30653 Input Calculated_Setpoint Setpoint NoWrite Valent VX Series Controller...
  • Page 48 Allows the BMS to control EF_Control_Source_ Read_ exhaust fan speed. True = Local Coil Commandable BMS. False = Local. Allows the BMS to control OAD_Control_Source_ Read_ OAD position. True = BMS. Local Coil Commandable False = Local. Valent VX Series Controller...
  • Page 49 Compressor 1 Enable ReadCOV_ Active Inactive 10164 Discrete Enable_Digital_Output Digital Output NoWrite Compressor_2_ Compressor 2 Enable ReadCOV_ Active Inactive 10165 Discrete Enable_Digital_Output Digital Output NoWrite Compressor_3_ Compressor 3 Enable ReadCOV_ Active Inactive 10166 Discrete Enable_Digital_Output Digital Output NoWrite Valent VX Series Controller...
  • Page 50 Discrete Alarm.Active (0=Normal 1=Alarm) NoWrite Space_CO2_1_ Space CO2 1 Analog Input ReadCOV_ Analog_Input_Alarm. Alarm Normal 10485 Discrete Alarm (0=Normal 1=Alarm) NoWrite Active Space_High_Static_ Space High Static Alarm ReadCOV_ Alarm Normal 10487 Discrete Alarm.Active (0=Normal 1=Alarm) NoWrite Valent VX Series Controller...
  • Page 51 High Pressure Ratio Alarm Alarm Normal 10551 Discrete Active NoWrite (0=Normal 1=Alarm) Al_HiT_Cond_EVD_1. Al_HiT_Cond_EVD_1 ReadCOV_ Alarm Normal 10552 Discrete Active (0=Normal 1=Alarm) NoWrite Al_IncompleteClosing_ EVD Incomplete Closing ReadCOV_ Alarm Normal 10553 Discrete EVD_1.Active Alarm (0=Normal 1=Alarm) NoWrite Valent VX Series Controller...
  • Page 52 Discrete Economizing.Active is open NoWrite OAD_Feedback_Error_ Feedback indicates the OAD ReadCOV_ OAD_Not_Modulating. Alarm Normal 10694 Discrete is not modulating NoWrite Active OAD_Feedback_Error_ Feedback indicates the OAD ReadCOV_ Alarm Normal 10696 Discrete Excess_OA.Active is not closing NoWrite Valent VX Series Controller...
  • Page 53 Mixed_Temp_Analog_ ReadCOV_ Mixed Temperature 30263 Input Input NoWrite Exhaust Fan Speed Remote Exhaust_Fan_Speed_ ReadCOV_ Command Analog Input 30455 Input Analog_Input NoWrite value Supply Fan Speed Remote Supply_Fan_Speed_ ReadCOV_ Command Analog Input 30461 Input Analog_Input NoWrite value Valent VX Series Controller...
  • Page 54 Normal 10391 Discrete Active (0=Normal 1=Alarm) NoWrite Mixed_Temperature_ Mixed Temperature Sensor ReadCOV_ Alarm Normal 10452 Discrete Sensor_Alarm.Active Alarm (0=Normal 1=Alarm) NoWrite OAD_AMD_analog_ OAD CFM Analog Input ReadCOV_ Alarm Normal 10456 Discrete input_Alarm.Active Alarm (0=Normal 1=Alarm) NoWrite Valent VX Series Controller...
  • Page 55: F: Modbus Connections

    Appendix F: Factory ModBus Connections Valent VX Series Controller...
  • Page 56 Find current mechanical and controls manuals here: www.valentair.com/Literature © 2020 Valent Valent VX Series Controller Continuous product improvement is a policy of Valent; therefore, product Part number: 484280 functionality and specifications are subject to change without notice. For the Rev. 1 most recent product information visit the product website.

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