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OJ Electronics Air2 Master - User Manual

OJ Electronics Air2 Master
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INSTRUCTIONS
© 2014 OJ Electronics A/S
1
67048B 07/14 - (OSH)
Type OJ Air2 Master
• English
• Deutsch
• Français
• Svenska
• Norsk
• Dansk
English
LIST OF FIGURES
The following figures are located at the back of the instructions:
Fig. 1: Dimensions, front view
Fig. 2: Dimensions, side view
Fig. 3: Configuration, complete with 2 x Fan IO
Fig. 4: External communication ports
Fig. 5: Internal communication ports
Fig. 6: Connections in RJ12 port for internal communication
Fig. 7: Electrical terminal connections
Fig. 8: Inserting the SD card
Fig. 9: OJ Air2 Master, rear view
Fig. 10: OJ Air2 Master, 45° view of top
Fig. 11: Cable for external Modbus connection
INTRODUCTION
OJ Air2 Master is an intelligent, freely configurable controller for the OJ
Air2 system. OJ Air2 Master contains a wide range of installations, each
of which can be configured to ensure perfect adaptation to the ventilation
system concerned and the provision of precisely the functions needed for
energy-optimised control.
The system is configured directly in the built-in Web server via a standard
IE browser on a PC.
Thanks to the multi-level user interface, the system designer can create
dierent access levels for various user groups.
The ventilation system is operated from a PC via the built-in Web server
or from the hand terminal via its unique "turn and push" button. OJ Air2
Master handles all control functions and communication to and from the
system.
OJ Air2 Master contains several dierent interfaces for peripheral units,
allowing it to be connected to sensors, pumps and valves.
OJ AIR2 Master can be connected to a BMS system via interfaces such as
Modbus RTU, Modbus TCP/IP, BACnet and LON.
PRODUCT PROGRAMME
Type Product
OJ Air2 Master Controller for air handling unit, Modbus, IP20
OJ Air2 Fan IO
IO module with two pressure transmitters and ana-
logue/digital inputs and outputs
OJ Air2 HTERM Hand terminal for system operation
OJ Air2 EXT Expansion module
OJ Air2 LON LON module for connection to BMS system
OJ Air2 EC EC controller for EC motor
OJ FC Frequency converter for motor mounting
OJ FC-W Frequency converter for wall mounting
RHX2M
Controller and step motor for rotary heat exchanger
with Modbus communication
CONFIGURATION
At the factory
The system designer configures the ventilation system at the factory via the
user-friendly OJ Air2 Master Web interface and saves the settings in a data
file containing application and system parameters.
At the installation site
Once the system has been installed, it is tested and commissioned by a
technician, who sets energy-optimising and other user specific parameters
on site.
Daily operation
Everyday users operate the system via the built-in Web server or the hand
terminal.
Configuration of ventilation application
OJ Air2 Master can be configured for a wide range of individual ventilation
applications, which can be freely combined as desired or required by the
ventilation system.
FUNCTIONS
Available ventilation functions
Temperature control:
• Constant inlet temperature
• Constant extract temperature
• Constant room temperature
• Constant temperature dierential
• Outdoor temperature compensated inlet temperature
• Summer/winter compensation
• Recirculation, night-time heating
• Summer night cooling
• Forced cooling
Fan control:
• Constant flow
• Constant pressure
• Inlet pressure as slave
• Extract pressure as slave
• Constant CO2
• Low speed/high speed (recirculation)
• Constant operation
• Automatic operation
Fire:
• Fire in air handling unit
• Fire in duct system
• Fire alarm from ABA
Other functions
• Electric heating battery
• Hydronic heating battery
• Cross-flow heat exchanger
• Rotary heat exchanger
• Fluid-coupled exchanger battery
• Hydronic cooling
• DX cooling
• Control of damper motors
• Fault log
• Alarm management
• Modulated recirculation
• Automatic summer/winter time
UPDATING SOFTWARE
OJ Air2 is equipped with a standard SD card reader and a standard SD
card is used to update OJ Air2 Master software. To update the OJ Air2
Master software version, the SD card must contain two files: a win.zip file
and a .crc file, both of which must be located in the "root directory" of the
SD card.
Insert the SD card with the two files into the card reader. The OJ Air2
Master will then check the content of the card and, if the SD card contains
a higher software version than that which is already installed on the OJ Air2
Master, updating will be started when the "turn and push" button of the OJ
Air2 hand terminal is pressed. The SD card must not exceed 8 GB.
NOTE! The SD card must be inserted into the OJ Air2 Master with the
connectors facing forwards (fig. 8).

Table of Contents

Questions and Answers

  • H
    Howard ThomasAug 14, 2025
    Why is there no communication between PC and OJ Electronics Air2 Master when connected via router?
    • V
      Vanessa WhiteAug 14, 2025
      If you're experiencing communication issues between your PC and the OJ Electronics Air2 Master when connected through a router, it could be due to several reasons. First, ensure that you're using the correct IP address. You can find the OJ Air2 Master IP address using the OJ Air2 HTERM and then enter it into your browser's address field. Also, verify that the "Proxy server" is disabled for your LAN connection. Other potential causes include a defective RJ45 LAN cable (replace the cable), a defective PC network card (replace the PC or network card), a defective OJ Air2 Master (replace the unit), or the power supply for the OJ Air2 Master being switched off (switch on the power supply).
  • V
    vblanchardAug 21, 2025
    What to do if OJ Electronics Air2 HTERM is inoperative?
    • R
      Robert AndersonAug 21, 2025
      If your OJ Electronics Air2 HTERM is not working, start by checking the power supply. Also, check the electrical connections, cable connections, and port connections. If the power supply for the OJ Air2 Master is switched off, switch it on. Ensure the OJ Air2 HTERM is connected to the correct port. If none of these steps resolve the issue, the OJ Air2 HTERM may be defective and need replacement.
  • J
    Jack PriceAug 25, 2025
    What to do if digital outputs are inoperative in OJ Electronics?
    • D
      Denise BurkeAug 26, 2025
      If the digital outputs are not working, check the electrical and terminal connections. Also, verify the configuration in the "OJ Modules"/"Configuration" menu using your Web browser and change it if necessary. Ensure that the power supply for the OJ Air2 Master is switched on. Check for and remove any short circuits from the digital output. If the problem persists, the digital output may be defective, requiring replacement of the OJ Air2 Master.
  • J
    johnshafferAug 28, 2025
    What to do if analogue outputs are inoperative in OJ Electronics?
    • B
      buchanannancyAug 28, 2025
      If the analogue outputs are inoperative, start by checking the electrical and terminal connections. Then, check the configuration in the "OJ Modules"/"Configuration" menu using your Web browser, and change it if necessary. Ensure the power supply for the OJ Air2 Master is switched on. Also, check for and remove any short circuit from the analogue output. If the issue continues, the analogue output may be defective and the OJ Air2 Master may need to be replaced.
  • M
    Marco VasquezSep 1, 2025
    What to do if sensor inputs are inoperative in OJ Electronics?
    • L
      Larry GardnerSep 1, 2025
      If the sensor inputs are not working, check the electrical and terminal connections. Also, check and, if necessary, change the sensor inputs configuration in the "OJ Modules"/"Configuration" menu using your Web browser. Make sure that the power supply for the OJ Air2 Master is switched on. If the problem persists, the sensor input may be defective, and the OJ Air2 Master may need to be replaced.
  • J
    Jerry KennedySep 5, 2025
    What to do if digital inputs are inoperative in OJ Electronics?
    • R
      Ronald ElliottSep 5, 2025
      If the digital inputs are not functioning, verify the electrical and terminal connections. Also, check the configuration in the "OJ Modules"/"Configuration" menu using your Web browser and change it if necessary. Ensure that the power supply for the OJ Air2 Master is switched on. If the issue remains, the digital input may be defective, requiring the replacement of the OJ Air2 Master.
  • D
    Donald SchultzSep 8, 2025
    What to do if analogue inputs are inoperative in OJ Electronics?
    • M
      Mark ThompsonSep 9, 2025
      If the analogue inputs are not working, check the electrical and terminal connections. Also, check and, if necessary, change the configuration in the "OJ Modules"/"Configuration" menu using your Web browser. Ensure that the power supply for the OJ Air2 Master is switched on. If the problem persists, the analogue input may be defective, and the OJ Air2 Master may need to be replaced.
  • J
    Julie HarrisNov 16, 2025
    Why is there no communication between PC and OJ Electronics Air2 Master when connected directly without router?
    • C
      chaneykaylaNov 16, 2025
      If you're having trouble with communication between your PC and the OJ Electronics Air2 Master when directly connected, here are a few things to check: * **IP Address:** Ensure that both the OJ Air2 Master and your PC network card have static IP addresses set. For example, set the OJ Air2 Master to 192.168.0.100 and the PC network card to 192.168.0.101. * **Browser IP Address:** Double-check that you've entered the correct IP address in your browser. * **Proxy Server:** Make sure the "Proxy server" is disabled for your LAN connection. Other potential issues could be a defective RJ45 LAN cable (replace it), a defective PC network card (replace the PC or network card), a defective OJ Air2 Master (replace the unit), or the power supply for the OJ Air2 Master being switched off (switch...

Summary

Configuration

At the installation site

Technician tests and commissions system, setting parameters on site.

Configuration of ventilation application

OJ Air2 Master configures individual ventilation applications.

Functions

Available ventilation functions

Lists various temperature, fan, and fire control functions.

Updating Software

Installation

Specification

Sensor inputs

Details PT1000 sensor inputs, terminals, and measurement range.

Digital inputs

Describes six potential-free digital inputs and their terminal connections.

Analogue inputs

Details two analogue inputs for 0-10 V DC signals and terminals.

Digital outputs

Analogue outputs

Technical Data

Communication

Troubleshooting

OJ Electronics Air2 Master Specifications

General IconGeneral
DisplayLCD
MountingWall-mounted
Power SupplyMains
Operating Temperature0 to +50°C
Storage Temperature-20°C to 60°C
Relative Humidity5% to 95% (non-condensing)