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L-STUDIO AIR Next generation VAV control - Video

LIOB-AIR Controller

CEA-709BACnetDALIModbusMP-BusOPC XML-DAOPC UAEnOceanWireless Local Area Network (WLAN)LTESNMPAlarming (Alarm Management)SchedulingTrending (Historic Data Logging)IoTE-mail NotificationSMS NotificationEthernet (Ethernet Switch)LIOB-IPLocal I/OsGateway FunctionLocal ConnectionGlobal ConnectionLocal Manual OperationNetwork SecurityRemote AccessVNC (Virtual Network Computing)Web Server for Device ConfigurationMathematical FunctionsIEC 61499 – L-STUDIOIEC 61131 – L-STUDIOBACnet Router FunctionBackup / RestoreLWEB-900 Integrated Building Management SystemLWEB-802/803 VisualizationL-STATUL Recognized Product


LIOB‑AIR is a fully IP based variable air volume controller (VAV controller) with a predefined, flexible, reprogrammable application program and sophisticated management functions for a building ventilation system.

The L‑STUDIO AIR designer supports fast and flexible project design meeting any VAV system requirements. Each VAV controller has a BACnet and an OPC network interface and integrates seamlessly into every BMS. The graphic pages for operation, supervision, and device configuration are hosted on the LIOB‑AIR eliminating the need for a Tridium or whatsoever middleware component. Without any additional effort L‑STUDIO AIR seamlessly integrates into the LWEB‑900 building management system. Local trending and alarming provide in depth operating conditions to the BMS. Local scheduling allows reliable zone operation even if the network is down. Sophisticated DCV algorithms save energy and 24/7 online test algorithms ensure proper system operation and detect malfunctioning devices like a blocked damper actuator, a stuck reheat valve, a dead series fan, etc.

Communication can be established via Ethernet or via the optional meshed WLAN. The dual Ethernet interface allows daisy chaining VAV controllers for simple network wiring. The optional built-in WLAN supports diversity antennas for reliable wireless communication in a self-healing meshed network topology. A dedicated port connects the L-STAT room operator panel for user interaction tasks. The builtin damper actuator communicates via MP-Bus and provides detailed status information. The built-in differential pressure sensor is used to measure the air flow. A number of universal inputs and analog and digital outputs can be configured to connect additional sensors and actuators. Additional devices are supported by an extra L-IOB, by RS-485 or wireless by EnOcean. An optional LTE-800 connected to the USB port allows for remote site access over a mobile network.

IoT Integration

The IoT function (Node.js) allows connecting the system to almost any cloud service, either for uploading historical data to analytics services, delivering alarm messages to alarm processing services or operating parts of the control system over a cloud service (e.g., scheduling based on Web calendars or booking systems). Processing Internet information such as weather data in forecast-based control is also possible. Finally, the JavaScript kernel also allows implementing serial protocols to non-standard equipment in primary plant control.

DALI Integration

The LIOB-AIR20 model provides an additional DALI communication port. This model allows for easy integration of lighting functions in the LIOB-AIR controller without the need for a separate L-DALI device. While having the comfort of using all L-DALI functions directly on the LIOB-AIR this reduces cost of installation giving this model a competitive edge in LIOB-AIR projects that require lighting solutions as well.

Supported VAV types
  • Standard VAV (only Air Flow Control without reheat and without fan)
  • VAV with electric reheat up to 3 stages
  • VAV with hot water reheat
  • VAV with series fan
  • VAV with series fan and electric reheat up to 3 stages
  • VAV with series fan and hot water reheat
  • VAV with parallel fan and electric reheat up to 3 stages
  • VAV with parallel fan and hot water reheat
  • All reheats can also have optional peripheral heat
Supported outputs (actuators)
  • Damper MP-Bus
  • Damper modulating
  • Damper floating
  • Parallel fan (also EC motors are supported)
  • Series fan (also EC motors are supported)
  • Reheat hot water modulating
  • Reheat hot water floating
  • Reheat electric modulating
  • Reheat electric up to 3 stages
  • Peripheral heat modulating
  • Peripheral heat floating
  • Peripheral heat on / off

Supported inputs (sensors)

  • Pressure (internal)
  • Space temperature
  • Space temperature setpoint, absolute setpoint and/or offset
  • Occupancy sensor
  • Occupancy override (setback override)
  • Discharge temperature
  • CO2 or VOC sensor
  • Relative humidity
  • Window contact
  • Damper feedback
  • Flow setpoint external (European version)


The LIOB-AIR VAV controller integrates the following applications:

  • Flow Control
  • Flow Configuration
  • Flow Alarms
  • Air Flow Calibration
  • Space Temperature Control
  • Sequence Control
  • Space Temperature Alarms
  • Space Temperature Setpoint Control
  • External Space Temperature Setpoint
  • Occupancy Control
  • Discharge Temperature Control
  • CO2 or VOC Control
  • Humidity control
  • External Flow Setpoint Operation
  • Data aggregation to the Air Handling Unit
  • Group Functions


 Sequence Control

 LIOB-AIR Visualization


LIOB-AIR Controller Products


LIOB I/O controller with application program variable air volume control

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Related documents and software for LIOB-AIR1
3D View for LIOB-AIR1


LIOB I/O controller with application program variable air volume control

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Related documents and software for LIOB-AIR2
3D View for LIOB-AIR2


LIOB I/O controller with application program variable air volume control

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Related documents and software for LIOB-AIR13
3D View for LIOB-AIR13


L-IOB controller with application program variable air volume control, DALI lighting control, actuator included

(expected availability in Q2/2020)
Add this product to the Request for Quote
Related documents and software for LIOB-AIR20

L-IOT1Add-on Software License to enable IoT functionality on LIOB-585/586/588/589, LIOB-AIR, and LINX-102/103/202/203
Add this product to the Request for Quote
Related documents and software for L-IOT1


  • I/ O controller with physical inputs and outputs
  • Specific application program for variable air volume control
  • Networking via redundant IP network
  • Alarming, Scheduling, and Trending (AST™)
  • Node.js support* for easy IoT integration (e.g. Google calendar, Alexa & friends, multimedia equipment,…)
  • Trending of all important data points in the controller
  • Configuration and parameterization with L‑STUDIO
  • Integration of the L-STAT Room Operator Panel
  • Integrated LWEB‑802/ 803 room operation
  • Integrates seamlessly into the LWEB‑900 system
  • Built-in web server for device configuration
  • Extension with physical inputs and outputs using one L-IOB I/ O Module (LIOB-45x/LIOB‑55x)
  • Dual Ethernet/ IP interface
  • BACnet/ IP interface is compliant to the B-BC (BACnet Building Controller) profile
  • Integrated OPC XML‑DA and OPC UA server
  • Manual control using the jog dial
  • Remote manual control via VCN client
  • 128x64 graphical display with backlight
  • Local display of device and data point information as clear text and via symbols
  • Easy device replacement without any additional software
  • Supports EnOcean: LIOB‑AIR20: built-in LIOB‑AIR1, LIOB-AIR2, LIOB-AIR13: needs LENO‑80x
  • Supports WLAN: LIOB‑AIR1, LIOB‑AIR13, LIOB-AIR20: built-in LIOB‑AIR2: needs LWLAN‑800
  • Supports LTE through LTE‑800 Interface
  • DALI Integration (LIOB-AIR20 only)
  • Integration of an actuator via MP-Bus
  • Differential pressure sensor
  • Damper actuator included

*requires L-IOT1 software license

L-STUDIO AIR Next generation VAV control - Video


Dimensions in mm [inch]



LIOB-AIR1 dimensions




LIOB-AIR13 dimensions



Dimensions (mm) 260 x 120 x 68 (L x W x H) 208 x 120 x 68 (L x W x H)
Installation mountable on the corresponding volume flow actuator mountable via oblong holes
Operating conditions 0 °C to 50 °C, 10 – 90 % RH, non condensing, degree of protection: IP20
Power supply 85-240 V AC 50/60Hz or 24 V DC / 24 V AC ±10 % 24 V DC / 24 V AC ±10 % 85-240 V AC 50/60Hz
L‑IOB I/ O Module 1 L‑IOB I/ O Module of type LIOB‑BIP

2 x Ethernet (100Base-T):
OPC XML‑DA, OPC UA, LonMark IP‑852, BACnet/ IP, Modbus TCP,
1 x L-STAT (Room Operator Panel)
1 x MP-Bus (actuator)
2 x USB-A
EnOcean (needs LENO‑80x)
LTE (needs LTE‑800)
WLAN (needs LWLAN‑800)

1 x RS‑485 (ANSI TIA/ EIA‑485):
or Modbus RTU
(Master or Slave)
1 x Internal WLAN (2 x SMA)


1 x Internal WLAN
(2 x SMA)

1 x RS‑485 (ANSI TIA/ EIA‑485):
or Modbus RTU
(Master or Slave)
1 x Internal WLAN (2 x SMA)
1 x DALI
1 x EnOcean (USA/
Canada 902 MHz)
Universal Input (UI) 10
10  10
Analog Output (AO) 3 3 3  3
Digital Output (DO) 9 (3 x Relay 16 A, 4 x Relay 6 A,
2 x Triac 0.5 A)
6 (4 x Relay 6 A,
2 x Triac 0.5 A)
6 (4 x Relay 6 A,
2 x Triac 0.5 A)
6 (4 x Relay 10 A,
2 x Triac 0.5 A)
Digital Output specification

Please refer to the “General Input and Output Specification of LOYTEC devices” for more details.

Differential Pressure Sensor 0–250 Pa 0–500 Pa
Power supply output 18 V DC, max. 200 mA
Torque ratings: 5 N m
Resource limits
Total number of data points 30 000 CEA-709 External NVs (polling) 2 000
OPC data points 10 000 CEA-709 address table entries 1 000 (non-ECS mode: 15)
BACnet objects 2 000 (analog, binary, multi-state) LonMark Calendars 1 (25 calendar patterns)
BACnet client mappings 1 000 LonMark Schedulers 100
BACnet calendar objects 25 LonMark Alarm Servers 1
BACnet scheduler objects 100 (64 data points per object) E-mail templates


BACnet notification classes 32 Math objects 100
Trend logs (BACnet or generic) 512 (4 000 000 entries, ≈ 60 MB) Alarm logs 10
Total trended data points 1 000 Connections (Local / Global) 4 000 / 250
CEA-709 network variables (NVs) 2 000 Number of L-WEB clients 32 (simultaneously)
CEA-709 Alias NVs 2 000  Number of EnOcean devices 100

General Input and Output Specification of LOYTEC devices

UI Universal Input

UIs are universal inputs for four different input types. They have an input voltage range of 0 V to 10 V, and can withstand up to 30 V. The UIs correspond to class 1 with a relative accuracy of ±1 % (of measured value) between 1 V and 10 V, and an absolute accuracy of ±10 mV between 0 V and 1 V. The ADC resolution is 16 bits. Galvanically isolated sensors resp. switches must be connected. Universal inputs can be configured as:

  • Binary Input (Digital Input)

    Input impedance > 20 kΩ, sampling period 10 ms.
    • In voltage mode, the threshold values are < 0.8 V for low level and > 2 V for high level.
    • In resistance mode, the threshold values are < 1.9 kΩ for low level and > 6.7 kΩ for high level.
    Between the threshold values, the resulting level of the UI is not defined.
  • Voltage Metering 0-10 V

    Input Impedance > 20 kΩ, sampling period < 1 s.
  • Current loop 4-20 mA

    Input Impedance > 20 kΩ, sampling period < 1 s. An internal shunt of 249 Ω is available for some universal inputs. Otherwise, an external resistor of 249 Ω must be used as a shunt.
  • Resistance Measurement

    Input Impedance 10 kΩ, sampling period < 1 s. Resistors in the range of 1 kΩ to 100 kΩ can be measured. For popular temperature sensors (e.g. Pt1000, NTC10K, NTC1K8, Ni1000) fixed internal translation tables are provided. For all other temperature sensors, translation tables can be defined in the configuration tool and used on the device.

The average sampling period p of analog inputs depends on the number of active (non-disabled) universal inputs n that are configured in analog mode. The formula for p is:

p = n * 125 ms

This means if e.g. only two UIs are configured as analog inputs, a new sample is taken every 250 ms (on average) for each of the two inputs. The UIs configured as digital inputs are unaffected (sampling period always 10 ms) by this formula.

DI – Digital Input, Counter Input (S0-Pulse)

DIs are fast binary inputs, which can also be used as counter inputs (S0). They follow the S0 specification for electric meters and have a sampling rate of 10 ms. They change state at a load of 195 Ω between the DI terminal and GND. Galvanically isolated sensors resp. switches must be connected.

AO – Analog Output

AOs are analog outputs with a signal range of 0 to 10 V (up to 12 V), a resolution of 10 bits, and a maximum output current of 10 mA (20 mA @ 12 V), short circuit proof (2 outputs at a time). The accuracy over the whole range is ±100 mV.

DO – Digital Output

The following digital outputs are available:

  • Relay 6A Output: Switching capacity 6A, 250VAC resp. 30VDC. Max in-rush current 6A, max. 600W (resistive) @ 250VAC.
  • Relay 10A Output: Switching capacity 10A, 250VAC resp. 30VDC. Max in-rush current 10A, max. 1600W (resistive) @ 250VAC.
  • Relay 16A Output: Switching capacity 16A, 250VAC resp. 30VDC. Max in-rush current 80A, max. 2000W (resistive) @ 250VAC.
  • TRIAC Output: Switching capacity 0.5A, 24 to 230VAC. External relays must not be connected.

When switching higher loads than specified an interface relay must be used and a quenching circuit like a varistor or RC element must be used at the selected LOYTEC device.

PRESS – Pressure Sensor

These inputs represent differential pressure sensors. They are equipped with two 3/16” (4.8 mm) hose connectors.