Swegon CLASS UNIT 1000 Installation instructions

Operation and maintenance instructions
CLASS UNIT
Applicable to program versions TAC5

32 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
1.0 Safety precautions
2.0 Product Overview
3.0 Wiring Overview
4.0 Functions
5.0 Commissioning
6.0 Preventive maintenance
7.0 Troubleshooting
8.0 Parameters/Commissioning Sheet
9.0 CE Declaration
CLASS UNIT
Table of content

54 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
1.0 Safety precautions
Danger/Warning/Caution
• All sta concerned shall acquaint themselves with
these instructions before beginning any work on the
unit. Any damages to the unit or its components
caused by improper handling or misuse by the pur-
chaser or the installer cannot be considered subject
to guarantee if these instructions have not been
followed correctly.
• Make sure that the power supply to the unit is dis-
connected before performing any maintenance or
electrical work!
• All electrical connections must be carried out by an
authorized installer and in accordance with local
rules and controls.
• Although the mains supply to the unit has been dis-
connected there is still risk for injury due to rotating
parts that have not come to a complete standstill.
• Beware of sharp edges during mounting and mainte-
nance. Make sure that a proper liing device is used.
Use protective clothing.
• Unit should always be operated with closed doors
and panels.
• If the unit is installed in a cold place make sure that
all joints are covered with insulation and are well
taped.
• Duct connections/duct ends should be covered during
storage and installation, in order to avoid condensation
inside of the unit.
• Check that there are no foreign objects in unit, ducting
system or functional sections.
• The unit is packed to prevent damage of the exter-
nal and internal parts of the unit, dust and moisture
penetration. If the unit is not to be installed immedi-
ately, it should be stored in a clean, dry area. If stored
externally, it should be adequately protected from the
weather inuence.
WARNING
Electronic boards contains ESD
sensitive components.
Wear antistatic wrist strap connected
to protective earth before to manipulate
them.
In alternative, discharge by
touching the unit, handle boards at cor-
ners only
and use antistatic gloves.
Must be connected by a qualied
Electrician.
Warning! Hazardous voltage.
Air from outdoor to the AHU (OA)
Air from the AHU to the building (SA)
Air from the building to the AHU (ETA)
Air from the AHU to outdoor (EHA)
PX PLATE HEAT
EXCHANGER KW HEATING COIL (ELECTRICAL)
Symbols and abbreviations

9
10
76 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
2.0 Product Overview
1. Centralized wiring box of the CB4 TAC5 DG circuit (fac-
tory pre-wired)
2. Supply fan
3. Exhaust fan
4. Air/Air heat exchanger ( + modulating 100% by-pass)
5. Drain pan
COMPONENTS CLASS UNIT
6. GF-ePM10 50% lter at fresh air inlet
7. GF-ePM10 50% lter on exhaust air
8. Access panels
9. Air inlet damper
10. Internal postheating electric coil (KWout)
AIR VOLUME AND DIMENSIONS
SIZE AIR VOLUME
CLASS UNIT 1000 1050 m³/h 291 l/s

Fig. 1
98 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
3.0 Wiring Overview
CT = output to inlet damper CT actuator(prewired) IN1 = Master selection
BYPA SS = output to bypass actuator (prewired) IN2 = dPa (pressostat digital input)
AL1 = ALARM OUTPUT (230V/5A) IN3 = Fire alarm input
B-/ A+ /GND / +12V = connection to HMI TACtouch IN4 = Bypass open /Stop heat recovery
K1: Airow MODE = m³/h K1 IN5 = Real time clock auto/manu
Demand/Pressure control = START/STOP IN6 = ON/OFF post heating (IBA/KWout)
Torque MODE = %torque K1 IN7 = ON/OFF SUPPLY if re alarm
K2: Airow control = m³/h K2 IN8 = ON/OFF EXHAUST if re alarm
Demand/Pressure control = 0-10V INPUT IN9 = BOOST Airow
Torque control = %torque K2 IN12 = PWM input bypass position
K3: Airow control = m³/h K3 OUT1 = 0-10V OUTPUT (airow/ pressure)
Demand/Pressure control = % ON K3 or 0-10 V INPUT OUT2 = 0-10V OUTPUT (airow/ pressure)
Torque control = %torque K3
T1 = from outdoors T° sensor (prewired) OUT5 = 24VDC /1A
T2 = from indoors T° sensor (prewired) O.R.1 (output relay 1 - SAT3) = PRESSURE ALARM
T3 = to outdoors T° sensor (prewired) O.R.2 (output relay 2 - SAT3) = FAN ON
O.R.3 (output relay 3 - SAT3) = HEATING DEMAND OUTPUT
T5 = supply T° sensor for KWout coil (prewired) O.R.4 (output relay 4 - SAT3) = BYPASS STATUS
KWout = output for KWout capacity control (prewired)
MAIN CONTROL BOARD TAC DG  CID025000
ELECTRONIC BOARDS CONTAINS ESD SENSITIVE COMPONENTS. WEAR ANTISTATIC WRIST STRAP CONNECTED TO PROTECTIVE EARTH BEFORE TO MANI PULATE THEM. IN ALTERNATIVE, DISCHARGE BY TOUCHING THE UNIT, HANDLE BOARDS AT CORNERS ONLY AND USE ANTISTATIC GLOVES.
3.1 CIRCUIT BOARD SAT 3  CID372005
The SAT3 circuit board is used for extra functions for
which inputs and outputs are not included as standard
in the control unit of the air handling unit. All outputs
are normally open (N.O.). Maximal load: 230VAC – 4A.
The circuit board SAT3 allows for signalling of the fol-
lowing by means of a potential-free contact:
• Fan status - O.R. 1
• Dierential pressure alarm - O.R. 2
• Heating demand - O.R.3
• Bypass status - O.R.4
Installation
SAT3 must be plugged onto the control board circuit
(see g.1).
Attention: The SAT3 must be plugged in before
the circuit is powered. SAT must be plugged in
correctly, wrong positioning can damage both
circuits permanently.

1110 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
3.2 INTERNAL WIRING DIAGRAM CLASS UNIT
ELECTRONIC BOARDS CONTAINS ESD SENSITIVE COMPONENTS. WEAR ANTISTATIC WRIST STRAP CONNECTED TO PROTECTIVE EARTH BEFORE TO MANI PULATE THEM. IN ALTERNATIVE, DISCHARGE BY TOUCHING THE UNIT, HANDLE BOARDS AT CORNERS ONLY AND USE ANTISTATIC GLOVES.
4.1 OPERATING MODE
There are ve main operating modes. The operating
mode determines how the airow or the fan torque
is modulated. The default operating mode is Airow
control. Exceptions if Constant Torque mode has been
selected in the product setup menu, in his cases it is the
fan torque that will be controlled and modulated.
4.0 Functions
In all the operating modes, the supply fan(s) will operate
as per the assigned mode and parameters. The exhaust
fan(s) will operate according to the chosen percentage
of the supply fan (%EXH/SUP ratio). The four main ope-
rating modes are:
• 1 - Airow control:
Flow control involves operating the air handling unit to keep the pre-set airow constant. The speed of the
fans is automatically regulated to provide correct airow even if the lters begin to become clogged, air
terminals are blocked, etc. Airow control mode is advantageous, since the airow always is exactly as it was
from the beginning. It should however be noted that everything that increases the pressure drop in the
ventilation system, such as blocking of air terminals and dust accumulating in lters, causes the fans to run at
a higher speed. This results in higher power consumption and may also cause discomfort in the form of noise.
There are three airow setpoints to be congured by the user (m³h K1, m³h K2, m³h K3).
• 2 - Demand control 0-10V:
The airow is controlled by a 0-10 V signal. The control signal is connected to terminals K2&GND. The assigned
supply airow is set as a percentage of a linear 0-10 V signal. The user denes the link with 4 parameters: Vmin,
Vmax, m³h Vmin and m³h Vmax, applied to the following diagram. The demand control mode is also
available for modulating fan torque instead of airow (relevant for backwards fans units without Kit CA).
The principle is identical to the demand control mode operation with the dierence that Vmin and Vmax are
connected to a %TQ instead of m³/h.
A CO2sensor option is available for selection when ordering. Once this option is selected, the sensors are
prewired and pre-congured to be ready for use.
• 3 - Pressure control:
The airow automatically varies to provide constant pressure in the ducting system. This type of control is
also called VAV control (Variable Air Volume).
Pressure on supply: the airow of the supply fan(s) is modulated to maintain a certain pressure Setting
constant. The pressure is measured by a pressure sensor located in the supply air duct.
Pressure on exhaust: the airow of the exhaust fan(s) is modulated to maintain a certain pressure Setting
constant. The pressure is measured by a pressure sensor located in the extract air duct.
• 4 - Mode OFF :
This stops the AHU

1312 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
4.2 TEMPERATURE CONTROL
There are several options available on CLASS UNIT units to ensure a comfortable tempera-
ture. The options are controlled either via supply or extract air temperature.
Extract Air Temperature
The default temperature control can be changed to Extract temperature control via the advanced setup.
The extract air temperature is measured on sensor T2. Extract air control involves keeping a constant temperature in the
extract air duct (premises), by controlling the supply air temperature. This provides a uniform temperature in the pre-
mises regardless of the load. The internal sensor T2 can be replaced with the optional external room temperature sensor
(CID370042).
Temperature sensor positioning :
Supply Air Temperature
Supply temperature control is the default setting. This involves keeping a constant supply air temperature without consi-
deration to the load in the premises. The supply air temperature is measured on sensor T5.
• 1 - Reduced supply air ow :
The heat exchanger is supplied with a frost protection sensor on the exhaust air (T3). If the exhaust air
temperature (T3) is >1°C and <+5°C :
•In airow control mode and demand control, the supply air ow will modulate between 100% and 33%
(AFlow)of the setpoint (AFn)
•In pressure control mode, the supply air pressure will modulate between 100% and 50% (AFlow) of the setpoint
(AFn)
If the exhaust air temperature (T3) is <1°C, the supply air fans will stop until the exhaust air temperature (T3) is
>2°C for 5 minutes.
• 2 - Modulating bypass :
The modulating bypass is controlled by the exhaust temperature sensor (T3). If:
• Exhaust temperature (T3) >+1°C: bypass closed or controlled by free cooling function
• Exhaust temperature (T3) ≤ +1°C: bypass will modulate for the exhaust temperature (T3) to exceed +1°C.
The corresponding supply air temperature will drop due to a lower airow through the heat exchanger
4.4 FROST PROTECTION
There are three strategies to protect the plate heat exchanger from freezing :
These Settings can be congured in ADVANCED SETUP
PLATE HEAT EXCHANGER
• In airow control mode: the airow by selecting m³h K1 /m³h K2/ m³h K3 /OFF (stop)
• In demand control mode :
• with only one 0-10 V signal (default) or with 2 signals to control the
supply airow: the link LS (percentage of the nominal link, cfr m³/h Vmin
and m³/h Vmax in setup OR cfr %TQ Vmin and %TQ Vmax in setup) and
the rate of the exhaust airow by the supply airow.
• with one 0-10 V signal for supply and one 0-10 V signal for exhaust (via
advanced setup): one link LS (percentage of the nominal link) for supply
and one for exhaust.
For each time slot select :
4.5 TIME SCHEDULE
The controller allows 6 time slots (channels) to be congured. For each day of the week,
the operation mode can be either AUTO (operate according to time slots) or OFF.

LANGUAGE
UNIT
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES
1514 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
5.0 Commissioning
As a human machine interface (HMI), several options are available. The HMI will enable access to the control parameters
in the integrated controller. The HMI as such does not contain any programming and therefor is not mandatory.
The possible HMIs are:
TACtouch touchscreen - CID372096
This 4.3”touchscreen display is used when there is a need for
a graphical HMI. The Touchscreen touchscreen is a complete
graphic monitoring system where the screens are designed to be
intuitive and complete, ensuring a userfriendly experience.
Position switch (COM4) - CID010007
The most basic interface to control a CLASS UNIT air handling
unit is the 4 position swich. This swith will allow to control the
unit to its three congured airow (low, medium and high)
and as a fourth position, the unit is switched o.
5.1 COMMISSIONING WITH TACtouch INTERFACE
The hand-held terminal consists of a 4.3” touch screen with a 1,5 metre long cable for
connection to the air handling unit's control circuit board.
If the hand-held terminal is not used for 20 minutes, it switches over to the sleep mode.
The Touchscreen controller can be used outdoors, but it must be kept at a weatherproof
place.
Data:
Operating temperature: 0... + 50°C
Maximum length of the cable: >100 metres
Protection class: IP20
Dimensions [mm]: 96,8x148,8x14,5
Power consumption: 120mA
IMAGE MANAGEMENT
Start-up image At the rst start up, the basic setup menu will
be activated automatically. See section ..
Main menu. See Section ...
The main menu is presented as a rotary
menu. Aer pressing the “menu”-button
at the bottom le corner of the Home
Screen, the rotary menu will be shown.
Home Screen. See Section ...
By default, the home screen will be shown
if no other menu is opened by the user or if
selected in the main menu.
N.B.! The appearance of the image varies
depending on the type of air handling unit
and functions selected.

1716 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
5.1.1 HOME SCREEN
The home screen displays the current key data
for the air handling unit and is shown is nor-
mally displayed if no other menu has been se-
lected or if selected from the main menu. The
touch screen switches to the sleep mode aer
20 minutes. To leave the sleep mode, press on
the touchscreen.
On the main screen, the elds are:
• Current operation mode
The operation modes are: STOP, Heating,
Cooling, Post ventilation, Freecooling, Frost
protection.
• Current date and time
• Active alarms
This elds shows the number of current
alarms. By clicking on this eld, more de-
tailed information about the dierent
alarms is available
• Menu
Accessing the main menu, see section 5.1.2
• Flow Chart
The ow chart is not editable by the user,
the conguration of the activated options
and functions is done throught the product
setup (menu). A code and a special training
are desired for access to this menu. The ap-
pearence of the image varies depending on
the type of air handling unit and its selected
functions and/or options. Flow chart sym-
bols:
Bypass (closed/
open)
Number of current
alarms
Current operation
status
Main menu
button
Electrical heating
coil
Motorised damper
(open/closed/
opening)
Time and date
The current date and time can be set and adjusted
if needed. The timer automatically takes leap years
into consideration. The system is preset for automatic
changeover between summer time/winter time accord-
ing to EU Standard.
5.1.2 MAIN MENU
The main menu consists of a rotary menu with 6 icons.
Control
The control menu will allow for the user to
change basic parameters and operation status
of the unit.
The unit can be switched on/o
The fan speed can be selected; three manual
speeds + one auto speed
Post heating, post cooling and free cooling
setpoints can be changed.
Alarm
Alarms are displayed on the main screen of
the HMI. Active alarms can be viewed in this
menu. All the alarms can be reset.
A fault can be traced by examining the func-
tion or functional component indicated in the
alarm text. More information about the indi-
vidual alarms, see section 7.0
If the fault cannot be immediately remi-
died:
Consider whether the air handling unit can
continue to operate until the fault has been
remedied.
Time schedule
The built-in timer enables you to control the
AHU’s operating mode/time. Certain other
oversteering functions such as external timer,
communication, etc. aect the preset operat-
ing modes. The controller allows 6 time slots
(channels) to be congured.
Time schedule
Times and days can be set when the air handling unit is
to run in the high speed mode, medium speed mode, low
speed mode or be switched o. For each day (Monday -
Sunday), six dierent time slots can be congured. The
time slots are subsequent.
Seasonal management
The seasonal management menu allows for the deacti-
vation of heating coils, cooling coils and bypass freecool-
ing function based upon a year calendar. In between the
programmed interval, the selected function is OFF.

LANGUAGE
UNITS
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES PARAMETRES
LANGUAGE
UNITS
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES
LANGUAGE
UNITS
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES
LANGUAGE
UNITS
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES
1918 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
Setup
Basic Setup
The basic setup menu will guide the user
through the most critical settings of the
air handling unit. This setup procedure is
described in detail, section 5.1.3
Readings
The operating status and the Settings can
be read. Used for performance checks and
for generally checking Settings, settings,
power consumption, etc. No Settings can
be altered in this menu group.
Maintenance
Conguration of service related settings.
A maintenance warning interval can be
congured as wel as the lter clogging
alarm.
Advanced setup
A code and a special training are desired
for access to this menu.
5.1.3 BASIC SETUP
When the air handling unit is started up for the
rst time, the commissioning menu is automati-
cally displayed. At the very end of the commis-
sioning (menu) the commissioning of the unit
has to be conrmed by the service technician.
Once the commissioning has been conrmed,
the commissioning menu will not be displayed as
rst menu any more. The commissioning menu,
however, will remain accessible through the ad-
vanced setup. See Section 5.1.4.
Language
The language desired can be set here. The language setting can
be changed at any time in the basic setup menu.
Setting Settings
range
Factory
setting
Language Languages as
displayed
English
Units
The desired unit can be set here. The unit setting can be changed
at any time in the basic setup menu.
Setting Settings
range
Factory
setting
Unit m³/h
l/s
m³/h
Airow regulation
The desired control mode can be set here. The setting can be
changed at any time in the basic setup menu. Depending on
the selected function, ows can be set as (l/s, m³/h), pressure
(Pa), input signal strenght (%) or torque (%). For both “Airow
control” and “Torque control”, three setpoints are available: Low,
medium and high.
Setting Settings
range
Factory
setting
Operating mode OFF
Airow
Demand control
Pressure
Torque
Airow

LANGUAGE
UNITS
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES
LANGUAGE
UNITS
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES
UNITS
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES
AIRFLOW REGULATION
TEMPERATURE
FIRE ALARM
PARAMETRES
PERIODIC MAINTENANCE
PERIODIC MAINTENANCE
COMMISSIONING COMPLETED
2120 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
Constant airow
Flow control involves operating the air handling unit to
keep the preset airow constant. The speed of the fans is
automatically regulated to provide correct airow even if
the lters become clogged, diusers are blocked, etc. The
exhaust air fan is controlled as a slave. A ratio between
exhaust and supply pressure can be congured in order
to create over, under or balanced pressure. The desired
setpoint is preset in (l/s, m³/h).
Setting Range Factory set-
ting
Airow K1/K2/K3 0...max
Ratio exhaust/supply 5...999% 100%
Enable pressure alarm No
Yes
Yes
DP Supply/Exhaust
for pressure alarm
25...999Pa 200Pa
Initialisation airow (l/s, m³/h)
Pressure alarm initia-
lisation
No
Yes
Yes
Demand control
The airow desired is regulated in response to 0-10 V
input signals from an external sensor, such as a carbon
dioxide or a humidity sensor. The function can be cong-
ured with a positive or a negative logic. A ratio between
exhaust and supply pressure can be congured in order
to create over, under or balanced pressure. The desired
setpoint is preset in (l/s, m³/h). The “sleep factor” is a
lower operating rate for the unit (due to e.g. low occu-
pancy) that will be activated by speed “III “
Setting Range Factory
setting
Vmin 0...10V 1,0V
Vmax 0...10V 10,0V
m³/h ~Vmin (l/s, m³/h)
m³/h ~Vmax (l/s, m³/h)
Ratio exhaust/supply 5...999% 100%
Sleep factor on K3 10...100% 100%
Enable pressure alarm No
Yes
Yes
DP Supply/Exhaust
for pressure alarm
10...999Pa 200Pa
Initialisation airow (l/s, m³/h)
Pressure alarm initia-
lisation
No
Yes
Yes
Temperature
The temperature control can be congured as a supply air
control or an extract air control. By default, this function
is congured as a supply air temperature control. Changes
to this conguration are done in the advanced setup; see
Section 5.1.4
Setting Settings
range
Factory
setting
T° heating 0...45°C 20,0°C
T° Cooling 0...99°C 24,0°C
T° Freecooling 0...99°C 15°C
Fire Alarm
An external re detection system is used to control the air handling unit in
case of emergency. The re alarm function is activated by means of digital
input IN3.
Setting Settings
range
Factory
setting
Input Normally open
Normally closed
Normally closed
Supply airow 0...max
Extract airow 0...max
Periodic maintenance
Built-in timer for maintenance warning; if the maintenance interval is exceed-
ed, a maintenance reminder will be displayed.
Setting Settings
range
Factory
setting
3 monthly warning Yes
No
No
12 monthly warning Yes
No
No
Commissioning completed
When the commissioning has been successfull and this is conrmed in this
menu, the commissionig menu will not be activated automatically anymore.
Setting Settings
range
Factory
setting
Conrmation of
successfull commis-
sioning
Yes
No
No

ADVANCED SETUP
STOP FAN WITH 0...10V
2ND 0...10 CONTROL SIGNAL
CONSTANT PRESSURE
SOFT STOP
START TORQUE
ADVANCED SETUP
STOP FAN WITH 0...10V
2ND 0...10 CONTROL SIGNAL
CONSTANT PRESSURE
SOFT STOP
START TORQUE
ADVANCED SETUP
2ND 0...10 CONTROL SIGNAL
CONSTANT PRESSURE
STOP FAN
START TORQUE
DEACTIVATE SOFTSTOP
ADVANCED SETUP
CONSTANT PRESSURE
STOP FAN
START TORQUE
DEACTIVATE SOFTSTOP
TEMPERTURE
ADVANCED SETUP
CONSTANT PRESSURE
DEACTIVATE SOFTSTOP
TEMPERATURE
BOOST
POST VENTILATION
ADVANCED SETUP
2322 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
5.1.4 ADVANCED SETUP
N.B.! The appearance and content of this menu var-
ies depending on the type of air handling unit and
functions and/or options selected. A code and a
special training are needed to access this menu.
Attention: The settings range for most of the
functions is dened for maximal exibility. The
factory setting is the advised setting, deviating
from this setting requires carefull considera-
tion.
Stop fan with 0...10V
Function only availalbe if “demand control” function has been selected
in basic setup. With this function, the fans can be stopped if the 0...10V
control signal is below or above a specied setpoint. The control signal is
connected to the analogue input K2.
Setting Settings
range
Factory
setting
Stop if <Vlow No
Yes
Yes
Vlow 0...10V 0,8V
Stop if >Vhigh No
Yes
Yes
Vhigh 0...10V 10,0V
Second 0...10V control signal
Function only availalbe if “demand control” function has been selected
in basic setup. With this function, a separate 0...10V control signal for
the extract air can be activated. The control signal is connected to the
analogue input K3.
Setting Settings
range
Factory
setting
0...10V on K3? No
Yes
No
Control Exhaust
Supply
Exhaust
Stop fan when pressure alarm
Possibility to stop the fans automatically in case of a pressure
alarm.
Setting Settings
range
Factory
setting
Stop fans No
Yes
No
Start torque
Possibility to change the fans’s starting torque.
Setting Settings
range
Factory
setting
Start Torque 0...100% 2%
Deactivate sostop
With this function, the “OFF” function is deactivated.
Setting Settings
range
Factory
setting
Sostop Yes
No
No
Temperature
In this menu advanced temperature control parameters can
be modied.
Supply air involves keeping a constant supply air temperature
without consideration to the load in the premises.
Extract air involves keeping a constant temperature in the
extract air duct (premises), by modulating the supply air
temperature.
The reaction speed of capacity control signal can be modied.
A higher Setting will result in a smoother control; a lower Set-
ting will result in a faster reaction speed. but also greater risc
of oscillations.
Setting Settings
range
Factory
setting
Supply or Extract tempe-
rature control?
Supply
Extract
Supply
Reaction speed 1...10 1
Supply air, min 0...20°C 15,0°C
Supply air, max 16...50°C 28,0°C
Stop fan if T°Supply <5°C No
Yes
No

DEACTIVATE SOFTSTOP
TEMPERATURE
BOOST
POST VENTILATION
EXTERNAL COILS
ADVANCED SETUP
TEMPERATURE
BOOST
POST VENTILATION
INTERNAL COILS
EXTERNAL COILS
ADVANCED SETUP
BOOST
POST VENTILATION
INTERNAL COILS
EXTERNAL COILS
INTERNAL COILS
ADVANCED SETUP
2524 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
Boost
The boost mode can be used to force the supply and extract
airow to a higher setpoint, when specic conditions are met.
The boost mode can be activated with a contact connected to
the digital input IN9 or by an analogue 0...10V control signal
connected to input K3. The boost setpoint is preset in (l/s,
m³/h).
Setting Settings
range
Factory
setting
Supply/Extract airow 0...max
Boost activation on Contact
RH
Contact
RH on/ o 0...100% 60% / 40%
Vmin/max RH on K3 0...10V 2,0V/ 9,5V
RH ~Vmin/max 0...100% 2%/ 95%
Post ventilation
The post ventilation function is used to keep the fans running
during a specied laps of time. This function is activated au-
tomatically when an electrical heating coil is activated.
Setting Settings
range
Factory
setting
Activation No
Yes
No
Time 0...9999sec 90sec
Internal coils
Electrical postheating coil
The electrical postheating coil is installed and congured
in factory. The electrical postheating coil will always have
its separate power supply and main switch. The capacity of
the coil will be controlled proportionally in order to keep a
temperature as dened by the selected operating mode.
Setting Settings
range
Factory
setting
Control mode Exhaust
Supply
Supply
Setpoint -9,9...99,9°C 21,0°C
PID - Proportional Band 0...100 5
PID - Integral 0...100 30
PID - Derivate 0...100 11
Frost protection
Frost protection plate heat exchangers
In environments where the extract air can occasion-
ally be humid, the defrosting function can be activated
to protect the heat exchanger from frosting. There are
four strategies: down control of the supply air volume,
modulating by-pass control, modulation of capacity of
a pre-heating coil, dierential pressure measurement
(cold climate option). If non of these measures are eec-
tive, the air handling unit can be stopped by limting the
minimal supply air temperature. When the Frost protec-
tion cycle is active, it will be indicated on the HMI. The
congurable temperatures are exhaust temperatures.
Setting Settings
range
Factory
setting
T° Low 1...3°C +1,0°C
T° High 1...5°C +5,0°C
Stop supply airow No
Yes
Yes
Frost protection cycle active
Frost protection alarm

2726 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
Modbus conguration
The MODBUS RTU communication requires an additional
satellite circuit (CID050043) which is used as commu-
nication interface. The communication protocol used is
MODBUS RTU, RS485.
Setting Settings
range
Factory
setting
Adress 1...247 1
Baudrate 1200
4800
9600
19200
9600
Parity No
Yes
No
LAN conguration
The MODBUS TCP/IP communication requires an addi-
tional satellite circuit (CID025072) which is used as com-
munication interface. The communication protocol used
is Modbus TCP/IP on Ethernet network over twisted pair
10 BASE T/100Base-TX IEEE 802.3.
Setting Settings
range
Factory
setting
IP conguration DHCP
Manual
Manual
IP adress 192.167.1.1
Netmask 255.255.255.0
Gatway 0.0.0.0
Operating time
For maintenance purposes, operating timers can be acti-
vated. If the “service alarm time” or the “Stop fan” timers
are triggered, the according alarm will be shown and the
unit will switch to “OFF”-mode.
Setting Settings
range
Factory
setting
Reset timer No
Yes
No
Fan run time activation No
Yes
No
Display time No
Yes
No
Service alarm time 0...999999h 0h
Stop fan 0...999999h 0h
0-10V output
The controller has as a standard feature two congur-
able analogue 0...10V outputs. The outputs represent the
actual airow (or torque) or the actual pressure delivered
by one of the selected fans.
Setting Settings
range
Factory
setting
Output 1 Flow Fan 1
Pressure Fan 1
Flow Fan 2
Pressure Fan 2
Flow Fan 3
Pressure Fan 3
Flow Fan 4
Pressure Fan 4
Torque Fan 1
Torque Fan 2
Torque Fan 3
Torque Fan 4
Flow Fan 1
Output 2 Flow Fan 1
Pressure Fan 1
Flow Fan 2
Pressure Fan 2
Flow Fan 3
Pressure Fan 3
Flow Fan 4
Pressure Fan 4
Torque Fan 1
Torque Fan 2
Torque Fan 3
Torque Fan 4
Pressure Fan 1
Attention : before handling and/or opening the access panels it is compulsory to shut down the unit. Do not
isolate the power supply whilst the unit is running. If KWin and\or KWout are installed, then isolate the corres-
ponding power supplies.
Regular maintenance is essential to guarantee good operation of the air handling unit and a long service life.
The maintenance frequency will depend on the application and on the actual environment conditions but the following are
general guidelines:
Replace the lters with a kit of replacement lters.
- Check for any alarms indicated on the control device. In case of an alarm refer to troubleshooting section.
- Check the state of lter clogging. The control device allows a pre-dened ‘lter alarm’ threshold to be set.
Replace lters if necessary. Filters that are too clogged can generate the following problems:
- Insucient ventilation
- Excessive increase of fan rotation speed
- Excessive sound levels
- Excessive power consumption (power consumption will increase exponentially to an increase
in pressure drop, for a constant airow)
- Unltered air passing through the heat exchanger (risk of clogging) and into ventilated rooms.
The list of replacement lter kits for each unit can be downloaded from our website.
- To locate the lter, refer to schemas on point 2.0.
- Inspection and cleaning of the inside of the unit:
• Vacuum clean any accumulations of dust in the unit.
• Inspect and gently vacuum clean the heat exchanger if necessary. Use a brush to protect the ns.
• Clean any condensation stains
• Clean any accumulations in the drain pan.
6.1 ONCE THE UNIT OPERATES IN NORMAL CONDITION
6.2 EVERY 3 MONTHS
6.0 Preventive maintenance

2928 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
7.0 Troubleshooting
- Conditions:
- Causes:
• Failure of fan Fx. This problem is usually caused by the fan motor.
If not, the failure may be caused by an internal cable (control or power) or by the TAC circuit.
- Eects:
The TAC control board generates and reports 18 types of alarms.
The alarms are subdivided into auto resetting and non-auto resetting alarms. For the latter, a reset will be
necessary once the problem has been resolved.
For each type of alarm, a full text description will be displayed on the user interface depending on the alarm type:
- Activation of contact relay (NC or NO contact)- AL 1
- Activation of SAT3 OR1 in case of pressure alarm, provided that the optional module SAT 3 is installed on the control board.
- “Alarm”, “Pa” and “AF” activated LED’s on control board
- Alarm on user interface.
- Alarm communication with networking modules provided that an optional communication module
(Modbus RTU, MODBUS TCP/IP, and KNX) is installed on the TAC control board.
7.1 TYPE 1: ALARM INDICATING A FAN FAILURE
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
B.11 Fan 1 failure
RED /
B.12 Fan 2 failure
B.13 Fan 3 failure
B.14 Fan 4 failure
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm / ON / stopped
Auto reset: yes
- Conditions:
• Mode airow control or demand control.
• External pressostat connected on IN2 input
- Causes:
• Pressure alarm setup in airow control or demand control mode
• External pressostat connected on IN2 input has triggered
- Eects:
* unless the status has been changed in advanced setup
7.2 TYPE 2: ALARM ON THE PRESSURE VARIATION
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
P. 1 0 Pressure alarm - Supply air
/ REDP. 2 0 Pressure alarm - Extract air
S.40 Pressure alarm from Pressure Switch*
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
/ Closed ON / Run*
Auto reset: yes

3130 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
- Conditions:
• Mode Airow control or Demand control: during the initialization of the pressure alarm.
• Mode Pressure control: during the initialization of the pressure reference via airow
- Causes:
The reference pressure (Paref) cannot be identied and the fans are stopped. 4 possibilities:
1. Actual airow < requested airow: The requested working point is ‘too high’ (too high pressure loss)
for the maximal available pressure at the requested airow for this fan.
2. Actual airow > requested airow: the nominal airow requested to initialize the pressure alarm
cannot be reached because the lower limit of the fan’s operating zone has been reached.
3. Very unstable pressure (pumping).
4. Assigned airow not reached aer 3 minutes.
If this occurs during initializing an alarm pressure, there are 2 options:
1. No action is taken: the control will operate without a pressure alarm.
2. Corrective action is taken (change the working point to one located in the working
zone of the fan, by reducing the pressure system, modifying the nominal airow…) and restart the setup operation.
If this occurs during initializing of the assignment pressure in pressure control mode: Corrective action must be taken
(change the working point to one located in the working zone of the fan, by reducing the pressure system,
modifying the nominal airow …) and restart the setup operation.
- Eects:
7.3 TYPE 3: ALARM REPORT DURING REFERENCE PRESSURE INITIALIZATION
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
P. 2 0 Initialisation of the reference pressure - Unstable supply air pressure
RED /
P. 2 1 Initialisation of the reference pressure - Unstable extract air pressure
P. 2 2 Initialisation of the reference pressure - Supply air ow too low
P. 2 3 Initialisation of the reference pressure - Extract air ow too low
P. 24 Initialisation of the reference pressure - Supply air ow not reached
P. 2 5 Initialisation of the reference pressure - Extract air ow not reached
P. 26 Initialisation of the reference pressure - Supply air ow too high - Min. limit of the motor
P. 27 Initialisation of the reference pressure - Extract air ow too high - Min. limit of the motor
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
ALARM / ON / Stopped
Auto reset: no
- Conditions:
- Causes:
•
The setpoint cannot be fullled because the upper or lower limit of the fan’s working zone has been reached
- Eects:
- Conditions:
- Causes:
• Crucial data from the circuit board has been lost
- Eects:
- Solutions:
• Try a TOTAL RESET of the data using the advanced setup. If still not resolved, order a new circuit board.
7.4 TYPE 4: ALARM INDICATING THE SYSTEM CANNOT FULFIL THE SETPOINT
7.5 TYPE 5: ALARM INDICATING A DATA FAILURE IN THE CONTROL CIRCUIT
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
S.11 “Constant Pressure” fan 1 - Measured pressure too high - Minimum air ow reached
RED /
S.12 “Constant Pressure” fan 1 - Measured pressure too low - Maximum air ow reached
S.13 “Constant Pressure” fan 3 - Measured pressure too high - Minimum air ow reached
S.14 “Constant Pressure” fan 3 - Measured pressure too low - Maximum air ow reached
S.20 “Demand control” fan 1 - Air ow too low - Reduce the pressure on this fan
S.21 “Demand control” fan 1 - Air ow too high - Minimum limit of the motor reached
S.22 “Demand control” fan 2 - Air ow too low - Reduce the pressure on this fan
S.23 “Demand control” fan 2 - Air ow too high - Minimum limit of the motor reached
S.24 “Demand control” fan 3 - Air ow too low - Reduce the pressure on this fan
S.25 “Demand control” fan 3 - Air ow too high - Minimum limit of the motor reached
S.34 “Constant Air Flow” fan 3 - Air ow too low - Reduce the pressure on this fan
S.35 “Constant Air Flow” fan 3 - Air ow too high - Minimum limit of the motor reached
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
D.10 Programme Error
RED /
D.20 Data Error
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
/ / ON / /
Auto reset: yes
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm status / ON / Stopped
Auto reset: no

3332 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
- Conditions:
• Fire alarm input must be connected to a re detection system
- Causes:
•
Activation of re alarm input, IN3, connected to a re detection system.
IN3 can be congured to work as NO open contact by default or as NC if congured so in the advanced setup.
- Eects:
* The fans are stopped by default in the event of a re alarm but, via the advanced setup, it is
possible to congure a xed airow for supply (contact IN7 needs to be closed) and for exhaust
(contact IN8 needs to be closed).
7.6 TYPE 6: FIRE ALARM
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
F.10 FIRE ALARM
RED /
F.1 1 End of the re alarm
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm status / ON / *
Auto reset: no
- Conditions:
• the running hours feature must be enabled in advanced setup
- Causes:
• SERVICE ALARM: the fan operating time (in hours) has exceeded the congurable threshold
• STOP FAN: the fan operating time (in hours) has exceeded the congurable threshold. This alarm stops the fans
- Eects:
* unless the status has been changed in advanced setup
- Conditions:
• User interface is connected
- Causes:
• Communications failure between the TAC circuit and the HMI
- Eects:
7.7 TYPE 7: MAINTENANCE ALARM
7.8 TYPE 8: ALARM INDICATING A COMMUNICATION BREAKDOWN
BETWEEN THE TAC CIRCUIT AND THE HMI
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
M.10 Maintenance 3 months
RED /
M.11 Maintenance 6 months
M.21 Operating hours
M.22 Operating hours - AHU o
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
CB COM ERROR Red /
TAC control boards
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm status / ON / Stopped if SERVICE STOP
FAN*
Reset via “fan run time” (TACtouch) or “alarm menu” (App)
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm status / / / /
Auto reset: yes

3534 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
- Conditions:
• Only for CLASS UNIT LP
- Causes:
•
The level of condensate is higher than a set Setting (approx. 1.5 cm).
It can also be activated if the pump is not present or defective
- Eects:
When activated, the supply and exhaust fans are stopped. This alarm is automatically reset when
the water level in the drain pan is lower than the setpoint, and the fans restart automatically.
- Conditions:
• Only with post-heating, post-cooling or free cooling with heat wheel or modulating bypass option
- Causes:
• T° sensor T5 located in the unit and connected to the TAC circuit is open, or short-circuited. This sensor is used
to regulate the post-heating or post-cooling function in the case of comfort T° control on T5 or to control the high
and low thresholds to limit the supply air temperature in the case of comfort T° control on T2.
- Eects:
7.9 TYPE 10 BIS: DRAIN PUMP ALARM
7.10 TYPE 11: ALARM INDICATING FAILURE ON T° SENSOR T5
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
R.10 Condensate tray full RED /
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
T.50 Sensor T5 disconnected
RED /
T.51 Sensor T5 short circuit
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm status / ON / Stopped if SERVICE STOP
FAN
Auto reset: yes
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm status / ON / /
Manual reset mandatory.
- Conditions:
• Only with post-heating option
- Causes:
• The comfort T° setpoint cannot be reached (actual T° lower than setpoint during 15 minutes, or 30 minutes
if comfort on T2 instead of T5, while post heating is at maximum.)
- Eects:
7.11 TYPE 12: ALARM INDICATING THAT THE COMFORT T° IS TOO LOW RELATIVE TO SETPOINT T°
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
/ / ON / /
Auto reset: yes
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
S.50 Post-heating - T° of the supply air too low RED /
- Conditions:
• Frost protection is only selected for PX units with electrical preheating (KWin) or water preheating (BAin) or if modulating
bypass.
- Causes:
• With KWin or BAin option: in certain air T° conditions as measured on the exhaust airow aer the heat recovery,
indicating that the internal electrical KWin coil or external hydraulic coil (BAin) has reached its limit, the TAC
control can take over to guarantee the anti-frost function.
If T° < -5°C during 5 minutes, fans are stopped.
• With modulating bypass in frost protection (« A-FREEZE » or « AF+FREECOOL » in the advanced setup),
this alarm indicates that the extracted air temperature at the exchanger output (T3 sensor) has not exceeded 1°C
during 15 minutes aer that the bypass has been opened at 100%.
- Eects:
7.4 TYPE 14: ALARM INDICATING FROST PROTECTION ALERT  FANS STOPPED T°
TAC control board
ALARM OUTPUT AL dPa OUTPUT LED ALARM Fans
Alarm status / ON Stopped
Manual reset mandatory.
Displayed on HMI TACtouch
Code Text displayed Level
A.11 Anti-freeze - Fans stopped 3

3736 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
- Conditions:
• Only with post heating or cooling option
- Causes:
• This alarm indicates that the supply temperature (T5) is lower than 5°C. The fans are stopped for 1 minute.
The alarm is congurable through the advanced setup and is disabled by default.
- Eects:
7.13 TYPE 16: ALARM INDICATING THAT THE SUPPLY T° IS TOO LOW
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm Status / ON / Stopped
Manual reset mandatory.
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
S.50 Post-heating - T° of the supply air too low
RED /
S.60 Supply air T° too low - Fan stopped
- Conditions:
• units with modulating bypass
- Causes:
• This alarm indicates that the modulating bypass has not reached the ordered position within 10 seconds.
The most common reason for this is a damaged position sensor on the bypass actuator, and this must be replaced.
Other reasons may be that the control board output is damaged, implying the replacement of the board, or a
mechanical blocking veried by a visual inspection of the bypass
- Eects:
- Conditions:
• The basic setup parameter “Filters Resets” must be >0
- Causes:
• Alarm indicating that the hours limit for the maintenance of the lters has been reached
- Eects:
7.15 TYPE 18: ALARM INDICATING AN INCORRECT POSITION OF THE MODULATING
BYPASS RELATIVE TO THE ORDERED POSITION
7.16 TYPE 19: ALARM INDICATING THAT THE HOURS LIMIT FOR THE MAINTENANCE OF
THE FILTERS HAS BEEN REACHED
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
FILTERS ALARM Red /
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
Alarm Status / ON / Stopped
Manual reset mandatory.
TAC control board
AL1 relay O.R.1 LED ALARM LED AF Fans
/ / ON / /
Auto reset: via dedicated reset
Displayed on HMI TACtouch
Text displayed LED ALARM LED Pa
B.20 Position of the modulating bypass incorrect RED /

3938 Operation and maintenance instructions – CLASS UNIT TAC5 Operation and maintenance instructions – CLASS UNIT TAC5
8.0 Parameters/Commissioning Sheet
Please enter all settings specic to your installation in this table. Please keep this document at hand when
there is a need to contact us to report a problem.
8.1 MAIN PARAMETERS AFTER COMMISSIONING
1
CLASS UNIT mo-
del:
2Operating mode:
O Constant Airow
O Demand control
O Constant Torque
O Constant pressure
3Constant Airow:
K1 = O [m³/h] O [l/s]
K2 = O [m³/h] O [l/s]
K3 = O [m³/h] O [l/s]
4Constant Torque:
K1 = % Torque
K2 = % Torque
K3 = % Torque
5Demand control:
Vmin = V
Vmax = V
m³h/%TQ Vmin = O [m³/h] O [l/s]
m³h/%TQ Vmax = O [m³/h] O [l/s]
% on K3 = %
6Constant pressure:
Assignment Pa = O [V] O [Pa]
% on K3 = %
7Ratio exhaust/supply: %
8If KWin option: T° KWin = °C
9KWout T° KWout = °C
Enter details when the Setting of a parameter has been changed (use only one row per parameter):
8.2 TRACK CHANGES
Parameter Name Setting before
change
Setting of
change #1
Date of
change #1
Setting of
change #2
Date of
change #2