OJ Electronics AHC-3000 User manual

67793A 10/18 (OSH) © 2018 OJ Electronics A/S
INSTRUCTIONS
Commissioning guide for AHC-3000
AHC-3000
CONTROL SYSTEM FOR COMPACT AIR HANDLING UNITS

© 2018 OJ Electronics A/S
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INSTRUCTIONS Commissioning guide for AHC-3000
Contents
1. Introduction ......................................................................4
2. Screen saving mode ...............................................................5
2.1 Lost connection to the HMI-35 touch display........................................5
3. Home screen .....................................................................5
4. Password protected settings .........................................................6
5. Selecting language in the HMI ........................................................6
6. Setting current time and date.........................................................7
7. Selecting system measuring units (°C, °F, m3/h, l/s, CFM) ..................................8
8. Fire settings ......................................................................8
8.1 Fire alarm ...................................................................9
8.2 AHU internal fire alarm .........................................................9
9. Balancing ........................................................................9
10. Update SW and read out current SW version ...........................................10
11. Room info readout ................................................................11
12. Alarms readout and reset...........................................................11
13. Communication set-up ............................................................12
13.1 Modbus TCP/IP - DHCP .......................................................12
13.2 Modbus TCP/IP – Static IP .....................................................13
13.3 MAC address ...............................................................13
13.4 Modbus RTU................................................................13
13.5 Bluetooth...................................................................14
13.6 Cloud: activation, status and settings ............................................14
14. Configuring the Application .........................................................15
14.1 Configuring the AHU type......................................................15
14.2 Configuring the temperature sensors .............................................16
14.3 Configuring the filters .........................................................17
14.4 Configuring the pressure transmitters for flow and deicing ............................18
14.5 Configuring the visualisation of the current power ...................................19
14.6 Configuring the fan alarm ......................................................20
14.7 Configuring the heating........................................................21
14.8 Configuring the cooling........................................................22
14.9 Configuring the supply air / single duct supply air system.............................23
15. Configuring the AHU field components ................................................24
16. Auto configuration ................................................................25
17. Digital input configuration ..........................................................26
18. Commissioning ..................................................................27
18.1 Commissioning the fans .......................................................27
18.2 Commissioning the heat recovery ...............................................28
18.3 Commissioning the heater .....................................................29
18.4 Commissioning the cooler .....................................................30
18.5 Commissioning the temperature sensors ..........................................31
18.6 Commissioning the CO2 sensors ................................................32
18.7 Commissioning the humidity sensors.............................................32

© 2018 OJ Electronics A/S
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INSTRUCTIONS Commissioning guide for AHC-3000
Contents
19. Control settings ..................................................................33
19.1 Fan control mode: Constant pressure ............................................33
19.2 Fan control mode: Constant air flow..............................................34
19.3 Fan control mode: Extract air slave ..............................................35
19.4 Fan control mode: Supply air slave...............................................36
19.5 Fan control mode: Constant motor speed % .......................................37
19.6 Air-control loop settings .......................................................38
19.7 Boost setpoint...............................................................38
19.8 Zero calibrating the pressure transmitters .........................................39
20. Temperature control settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
20.1 Temperature-control loop settings ...............................................41
20.2 Heating coil settings (water coil) .................................................42
20.3 Heating coil settings (electric coil 1) ..............................................43
20.4 Cooling coil settings (water cooling coil) ..........................................44
20.5 Cross-flow heat exchanger settings ..............................................45
20.6 Counter-flow heat exchanger settings ............................................46
20.7 Rotary heat-exchanger settings .................................................47
20.8 Summer night cooling (free cooling) ..............................................48
21. Operation time schedule ...........................................................49
21.1 Operation modes ............................................................49
21.2 Setting the active schedule period and fall-back speed ..............................50
21.3 Setting the standard daily-operation pattern .......................................51
21.4 Copying a daily schedule to one or more days .....................................52
21.5 Scheduled operational exceptions ...............................................53

© 2018 OJ Electronics A/S
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INSTRUCTIONS Commissioning guide for AHC-3000
Note
It is important for commissioning engineers and installers to read this commissioning guide
carefully before starting to configure and commission the OJ AHC-3000 system.
This commissioning guide provides valuable information which must be followed if the OJ
AHC-3000 system is to work ideally and provide maximum comfort while minimising energy
consumption.
This commissioning guide is intended to be used by the following individuals:
• The manufacturer/AHU producer
• The commissioning engineer
• The system integrator
• The installer
• The service technician
• The daily user – see www.ojelectronics.com
1. Introduction
The ACH-3000 from OJ Electronics A/S is an intelligent and at the same time simple-to-use
controller for air handling units. The OJ ACH-3000 system can control one air handling unit and,
when connected in a network, it is possible to control and monitor up to 25 air handling units from a
single controller and HMI* display. *=Human Machine Interface
This commissioning guide provides valuable information when commissioning an ACH-3000 air
handling unit at the factory. After the air handling unit is installed in the building, the installer and/or
system integrator will also find essential information in this guide to get the air handling unit to work
ideally and provide maximum comfort with minimum energy consumption.
It is crucial that anyone who is in contact with the ACH-3000 system, – manufacturers, installers,
service technicians and system integrators – must read this commissioning guide thoroughly before
starting to commission the AHC-3000.
For the manufacturer
The AHC-3000 has been developed with the aim of making the AHU controller set-up as easy and
user-friendly as possible. The AHC-3000 has a number of pre-configured most frequently used AHU
applications. The configuration and settings are simple and easy to make using the hand-held HMI
display.
For the commissioning engineer
Commissioning, setting the operation schedulers and optimising the energy of the AHC-3000 on-
site is done very easily from the HMI touch display.
For the installer
For the installer on-site, all internal cabling, wiring and configurations have already been made at the
factor. Therefore, all you need to do is supply the AHC-3000 AHU with power.
For the system integrator
The OJ AHC-3000 is one of the most flexible systems on the market in terms of BMS system
integration. Standard features worth mentioning: The Modbus RTU & TCP/IP is built-in. The
associated protocols can be downloaded from www.ojelectronics.com.
For the service technician
On the AHC-3000-T, all service settings and software updates can be done from a smartphone.
For the user
The AHC-3000 has several interfaces, such as: OJ-Cloud, Bluetooth, AHC-3000 app, HMI-20T room
touch display and the HMI-35 touch display from where the daily user can change temperature and
operation settings and receive alarms. Basic settings are password protected.

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INSTRUCTIONS Commissioning guide for AHC-3000
2. Screen-saver mode
If the HMI-35 display hasn't been touched for 60 seconds, the display will go into screen saver
mode. The display will show the current status of the air handling unit: see fig. 2.1
Note! Flashing HMI:
If the HMI-35T is flashing (black/white screen), the SW in the HMI is being updated from the AHC-
3000 controller.
Please wait two minutes until the flashing stops and the HMI-35T is ready to use.
Fig. 2.
Boost mode At least 1 “A”
alarm is active
AHU in stop At least 1 “B”
alarm is active
Rest time is displayed Current temperature
Current temperature Current temperature Current humidity AHU in low speed
Current humidity Current humidity Current temperature
Current humidity
2.1 Lost connection to the HMI-35 touch display
If the display continuously show “Lost communication”: _
Check the connection between the controller and the HMI-35 display
3. Home screen
When the display is in “Screen-savermode”, one touch will start up the display.
The first picture on a stand-alone unit.
From this window it is possible read out current values and make dierent
entries and settings.

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INSTRUCTIONS Commissioning guide for AHC-3000
4. Password-protected settings
Some menus are password protected.
Settings like temperature setpoint, language, time and other similar user settings are not password
protected.
Other installer and service menus may be protected by either a “Service password” or an “Installer/
Service password”
• Service password = 1 1 1 1
• Installer password = 1 1 1 2
The password expires in 60 minutes without
operation.
5. Selecting the language in the HMI
To start with, we suggest that you select your
preferred language.
Enter the menu level via the “Menu” in the upper
right corner of the home screen.
From here, select “Settings”
Fig. 4.3
Available languages: (see fig. 4.3)
_English _Française _Deutsch
_Dansk _Svenska _Norsk
_Suomi _Español _Polski
_Pyсский _Italiano _Nederlands
After selecting the preferred language, press “Back”
Your selection is automatically saved in the controller after selection.

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INSTRUCTIONS Commissioning guide for AHC-3000
6. Setting the current time and date
The local time and date must be set during the commissioning of the AHC-3000.
Without power, the AHC-3000's current time and date will be supported from a backup battery for at
least 12 months.
Select the local area time and date format (see fig. 6.1)
If you want to set/change the current “Time and Date”, select the parameter
(date, month, year) that you want to change by marking the current value field
(see Fig.no. 6.2) and use the up and down buttons to make your individual
adjustment for: date, month and year. Repeat this procedure for the current
time.
Auto daylight saving
Select Daylight saving time = “On”
Daylight saving will be activated according to the
local daylight saving calendar
Auto save function
After setting the current time and date, press
“Back”.
Your settings are automatically saved in the
controller after selection.
Fig. 6.1
Fig. 6.2

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INSTRUCTIONS Commissioning guide for AHC-3000
7. Selecting system measuring units (°C, °F, m3/h, l/s, CFM)
According to local demands, it is possible to select the measuring units:
Select °C or °F – only one selection is possible.
Select l/s, m3/h or CFM – only one selection is possible.
After setting the measuring units, press “Back”.
Your selection is automatically saved in the controller after selection.
8. Fire settings
The AHC-3000 supports two dierent kinds of fire alarm:
Fire alarm: detected from a fire thermostat or an automatic fire detection system (AFD).
Internal fire alarm: detected from the internal supply air and extract air temperature sensors.
Temperature units
°C Degrees Centigrade
°F Degrees Fahrenheit
Air flow units
m3/h Cubic metres per hour
l/s Litres per second
CFM Cubic feet per minute
Fig. 7.1 Fig. 7.2 Fig. 7.3
Fig. 8.1 Fig. 8.2 Fig. 8.3

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INSTRUCTIONS Commissioning guide for AHC-3000
8.1 Fire alarm
This fire alarm is detected on a digital fire input on the AHC-3000 controller.
The signal may possibly come from an automatic fire detection system (AFD) or an external fire
thermostat placed in the duct system.
If the digital input (fire alarm) detects the fire alarm (fire alarm = open contact), the AHU will enter
fire mode and the fan speed will assume the status selected in parameter “Supply fan speed”
/“Exhaust fan speed” (see fig. 8.3).
If a 0% fan speed is selected in both parameters, the AHU will stop and the dampers will close.
8.2 AHU internal fire alarm
This fire alarm uses the supply air and exhaust-air temperature sensors in the AHU to detect a fire
alarm. If the current value of the “Supply temperature” or “Extract temperature” is beyond the
setpoint (see fig. 8.3), the AHU will go into fire alarm mode and emit a fire alarm: “A” alarm. This fire
alarm will stop the fans.
9. Balancing
This function allows the installer to maintain a constant fan speed during the air-distribution
adjustment of, for instance, the manual dampers in a CAV application.
Selecting “Lock fan” will set the fan speed at the current value.
The fans will remain at this speed for eight hours – and the system will automatically return to normal
operation after this period of time has elapsed.
If the balancing job is finished before time runs out, you can manually return the function to “Normal
operation”.
Info:
Frost protection of the water heating coil is active during the balancing function – the normal
temperature control is active.

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INSTRUCTIONS Commissioning guide for AHC-3000
10. Update SW and read out the current SW version
To read out the SW version for the AHC-3000 and the connected HMI-35T
Updating the SW
To update the SW in the AHC-3000 and in the HMI-35T hand-held terminal, the updating SW must
be downloaded to the AHC-3000 controller using:
• OJ Air PC Tool
• AHC-3000 APP
• OJ-Air Cloud
To update the SW in the AHC-3000 controller, either
power o the controller for at least ten seconds or press: _
The update progress can be followed on the HMI-35T…
If the software update includes a new HMI software version, the
HMI display will flash for about thirty seconds while the update
is in progress.
Note
When the update button is activated, the AHU will
go into operating mode: “Service stop”. _
When the new software is active in the AHC-3000, the “Update” button
disappears, and the new software versions are displayed. The AHU will remain
in operating mode, “Service stop", until another operating mode is selected.

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INSTRUCTIONS Commissioning guide for AHC-3000
11. Room info readout
To read out the SW version for AHC-3000 and the connected HMI-35T
A simple status overview for the AHU system can be displayed by selecting _
Depending on the configuration, the current status and values will be displayed:
√ Current value on all temperatures in the AHU
• Only mounted and configured temperature sensors will be displayed
√ Current room temperature
• Only displayed if a room sensor (OJ-Air-HMI-20T) is installed and configured
√ Current value on all measured air flow in the AHU
• The current value is displayed if a pressure transmitter is installed across the fans.
√ Current filter pressure drop on all measured filters in the AHU
• The current pressure (Pa) will be displayed if a pressure transmitter is installed across the filters
12. Alarm readout and reset
If an alarm bell is displayed on the overview picture, one or more alarms are active in the system.
= One or more “A” alarms and possible
“B” alarms
= One or more “B” alarms
To enter the alarm overview, press the alarm bell symbol.

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INSTRUCTIONS Commissioning guide for AHC-3000
Reset alarms:
Clear Alarms will clear all active alarms.
After activating “Clear alarms”, any alarms still active in the system will be re-triggered and shortly
after show up again in the alarm overview.
Up to 16 active and logged alarms will be listed.
Alarm details and description:
Select the actual alarm (*1)
Latest cleared alarms will be listed in the
alarm log: “Log date & alarm number” (*2)
13. Communication set-up
The AHC-3000 can communicate on:
• a BMS system via Modbus TCP/IP and Modbus RTU (see 13.1)
• Directly connected to a computer via a LAN cable (RJ45) (see 13.2)
The AHC-3000 can also be connected to the OJ Cloud via the internet or a mobile app via Bluetooth
13.1 Modbus TCP/IP – DHCP
If the AHC-3000 is connected to a local area network (LAN) with a DHCP server, select “Dynamic
IP” under the menu “Static/Dynamic IP”
The DHCP server will automatically set all the necessary information in the AHC-3000, including: IP
address, Netmask, Gateway and DNS.
As soon as the AHC-3000 receives an IP address, Netmask, Gateway and DNS from the DHCP
server, this information will be found in the menu below.
(*2)
(*1)

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INSTRUCTIONS Commissioning guide for AHC-3000
13.2 Modbus TCP/IP – Static IP
If the AHC-3000 is connected to a stand-alone network without a DHCP server, or via a normal patch
cable to a local computer, select “Static IP” under the menu “Static/Dynamic IP”.
After selecting “Static IP”, specify the IP-address and the Netmask. Normally it is not necessary to
specify the Gateway, Primary and Secondary DNS. These values are normally sent automatically
from the AHC-3000 after connection.
If the AHC-3000 is connected to a local computer: Remember to adapt the settings on your
computer to the settings on the AHC-3000.
If the local IT department has reserved a specific fixed IP-address for the AHC-3000, also select
“Static IP”. After selecting “Static IP” specify the correct communication settings, such as: IP-
Address, Gateway, Primary and Secondary DNS. You will receive this information from the local IT
department.
13.3 MAC address
MAC address is a static number issued by OJ Electronics A/S. It cannot be changed.
13.4 Modbus RTU
If the AHC-3000 is connected to a BMS system which is a communication Modbus RTU, you must
specify the communication parameters like:
• Modbus address
• Baud rate
• Parity
• Number of stop bits
The AHC-3000 is connected to the BMS Modbus network via the RJ12 plug connector marked
“BMS Modbus RS485”, using a RJ12 patch cable.

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INSTRUCTIONS Commissioning guide for AHC-3000
13.5 Bluetooth
To use Bluetooth, you must use the AHC-3000-B.
The Bluetooth must be activated before use.
After activating Bluetooth in the AHC-3000-B,
you may start a scan from your Bluetooth device
(smartphone, tablet or similar)
The AHC-3000-B will now appear on the list of
Bluetooth devices. Select “Connect” on your
Bluetooth device.
13.6 Cloud: activation, status and settings
To permanently connect the AHU to the OJ-Cloud, use the type ACH-3000-T and connect it to the
Internet (see index 13.1 & 13.2).
Password protection
√ Select password protection (On/O)
Internet status
√ Status on the Internet connection (No cable/Connecting/Connected/Error)

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INSTRUCTIONS Commissioning guide for AHC-3000
Cloud status
√ Status of the cloud connection (Not connected/Connecting/Connected/Access denied/Error)
Device ID
√ Device ID on the AHC-3000 controller
Terms & conditions
√ You must accept the Terms & Conditions before the AHC-3000 will connect to the OJ Air Cloud®
√ Terms & Conditions are available on https://oj.hvac-cloud.com
Note! After accepting the Terms & Conditions, the AHC-3000 will start uploading data to OJ Air
Cloud®
Activation key
√ Read out the activation key. This must be used to log on to your OJ Air Cloud®account.
Note! Find more information for OJ Air Cloud®on: https://oj.hvac-cloud.com
14. Configuring the application
Now we will start to configure the application.
First, select the AHU type from among these main categories:
Note! The AHC-3000 must be in the operational mode “Service stop”. _
1. Rotor heat exchanger
2. Counter-flow heat exchanger
3. Cross-flow heat exchanger
4. Mixing
5. Supply
6. Extract
Note
If you use the “Autoconfiguration” function (see index 16 in this manual), you must make the
autoconfiguration” before configuring the AHU type (see index 14.1 below).
14.1 Configuring the AHU type
Here, select the type of AHU (see fig. 14.1)
After selecting the AHU type, select the size* of the AHU ( see fig. 14.2………14.7)
*Size is the max. volume of the AHU in m3/h
A number of predefined AHU sizes are listed:
Fig. 14.1

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INSTRUCTIONS Commissioning guide for AHC-3000
Fig. 14.2 Fig. 14.3 Fig. 14.4 Fig. 14.5 Fig. 14.6 Fig. 14.7
Rotor Counter flow Cross flow Mixing box Supply air Extract air
14.2 Configuring the temperature sensors
Here, select the temperature sensors in the AHU from among these options:
• PT-1000*
• NTC 12K
• Supply air temperature*
• Outdoor air temperature*
• Exhaust air temperature*
• Extract air temperature*
• Water temperature*
*= factory setting
All air-temperature sensors are pre-selected from the factory. Only the water
temperature is auto selected if a water heating battery is configured.

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INSTRUCTIONS Commissioning guide for AHC-3000
14.3 Configuring the filters
Here. select the filter monitoring from among these options:
It is possible to configure up to 2 filters in an AHU:
• Outdoor air filter
• Extract air filter
Filter alarm
Filter alarm function can be selected as:
• Timer function
• Filter switch, via digital input
• Static filter alarm, via pressure transmitter
• Dynamic filter alarm, via pressure transmitter
Filter alarm settings are made under “Commissioning”.

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INSTRUCTIONS Commissioning guide for AHC-3000
14.4 Auto-configured pressure transmitters for flow and deicing
Here you see the autoconfigured flow & deicing pressure transmitters:
• Supply flow
• Exhaust flow
• Pressure de-icing
These 3 pressure transmitters are all auto mounted via Modbus
communication and this window is a visualisation only. The
connected pressure transmitters are for measuring the flow of
the fans and the pressure drop over the heat exchanger (only
cross-flow and counter-flow heat exchanger).

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INSTRUCTIONS Commissioning guide for AHC-3000
14.5 Autoconfigured drives and visualisation of the current power
Here you see the autoconfigured drives which can display the current power consumption.
• Rotor
• Supply fan
• Exhaust fan
These three power components are all auto-mounted via
modbus communication and this window is only a visualisation
of the connected power components.

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INSTRUCTIONS Commissioning guide for AHC-3000
14.6 Configuring the fan alarm
Here, select the type of fan detection from among these options:
• Tacho
• Digital input
The fan alarm can be configured as “Tacho” or as “Digital input”
The Tacho alarm is detected on a digital input from a pulsating Tacho
signal from the motor. When this pulsating Tacho signal stops and the
motor should actually be running, the system will emit an alarm.
The digital input is also detected on a digital input from either the
alarm relay on the motor/drives or over current alarm relay. When this
digital alarm signal contact is “closed”, the system will emit an alarm.