Swegon CLASS UNIT TAC5 CLASS UNIT - Instructions

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CLASS UNIT

Operation and maintenance instructions

Applicable to program versions TAC5

2 Operation and maintenance instructio ns – CLASS UNIT TAC5

CLASS UNIT

Table of content

1.0

Safety precautions

2.0

Product Overview

3.0

Wiring Overview

4.0

Functions

5 Commissioning

6.0

Preventive maintenance

7.0

Troubleshooting

8 Parameters/Commissioning Sheet

9.0

CE Declaration

Operation and maintenance instruction s – CLASS UNIT TAC5

Symbols and abbreviations

WARNING

Must be connected by a qualified

Electrician.

Warning! Hazardous voltage.

PLATE HEAT

EXCHANGER

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 corners only and use antistatic gloves.

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)

HEATING COIL

(ELECTRICAL)

4 Operation and maintenance instructio ns – CLASS UNIT TAC5

1.0 Safety precautions

Danger/Warning/Caution

• All staff 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 purchaser 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 disconnected 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 disconnected 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 maintenance. Make sure that a proper lifting 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 external and internal parts of the unit, dust and moisture penetration. If the unit is not to be installed immediately, it should be stored in a clean, dry area.

If stored externally, it should be adequately protected from the weather influence.

Operation and maintenance instruction s – CLASS UNIT TAC5

2.0 Product Overview

COMPONENTS CLASS UNIT

Centralized wiring box of the CB4 TAC5 DG circuit

(factory pre-wired)

Supply fan

Exhaust fan

Air/Air heat exchanger ( + modulating 100% by-pass)

Drain pan

GF-ePM10 50% filter at fresh air inlet

GF-ePM10 50% filter on exhaust air

Access panels

9. Air inlet damper

10.

Internal postheating electric coil (KWout)

Operation and maintenance instructio ns – CLASS UNIT TAC5

AIR VOLUME AND DIMENSIONS

SIZE

CLASS UNIT 1000

AIR VOLUME

1050 m³/h 291 l/s

Operation and maintenance instruction s – CLASS UNIT TAC5

3.0 Wiring Overview

MAIN CONTROL BOARD TAC DG - CID025000

CT = output to inlet damper CT actuator(prewired)

BYPASS = output to bypass actuator (prewired)

AL1 = ALARM OUTPUT (230V/5A)

B- / A+ / GND / +12V = connection to HMI TACtouch

K1 : Airflow MODE = m³/h K1

Demand/Pressure control

Torque MODE

= START/STOP

= %torque K1

K2 : Airflow control

Demand/Pressure control

Torque control

K3 : Airflow control

= m³/h K2

= 0-10V INPUT

= %torque K2

= m³/h K3

Demand/Pressure control

Torque control

= % ON K3 or 0-10 V INPUT

= %torque K3

T1 = from outdoors T° sensor (prewired)

T2 = from indoors T° sensor (prewired)

T3 = to outdoors T° sensor (prewired)

T5 = supply T° sensor for KWout coil (prewired)

IN1 = Master selection

IN2 = dPa (pressostat digital input)

IN3 = Fire alarm input

IN4 = Bypass open / Stop heat recovery

IN5 = Real time clock auto/manu

IN6 = ON/OFF post heating (IBA/KWout)

IN7 = ON/OFF SUPPLY if fire alarm

IN8 = ON/OFF EXHAUST if fire alarm

IN9 = BOOST Airflow

IN12 = PWM input bypass position

OUT1 = 0-10V OUTPUT (airflow / pressure)

OUT2 = 0-10V OUTPUT (airflow / pressure)

OUT5 = 24VDC / 1A

O.R.1

O.R.2

(output relay 1 - SAT3)

(output relay 2 - SAT3)

= PRESSURE ALARM

= FAN ON

O.R.3

(output relay 3 - SAT3)

O.R.4

(output relay 4 - SAT3)

= HEATING DEMAND OUTPUT

= BYPASS STATUS

KWout = output for KWout capacity control (prewired)

Operation and maintenance instructio ns – CLASS UNIT TAC5

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 following by means of a potential-free contact:

• Fan status - O.R. 1

• Differential pressure alarm -

• Heating demand -

• Bypass status -

O.R. 2

O.R.3

O.R.4

Installation

SAT3 must be plugged onto the control board circuit

(see fig.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.

Fig. 1

Operation and maintenance instruction s – CLASS UNIT TAC5

3.2 INTERNAL WIRING DIAGRAM CLASS UNIT

10 Operation and maintenance instructio ns – CLASS UNIT TAC5

4.0 Functions

4.1 OPERATING MODE

There are five main operating modes. The operating mode determines how the airflow or the fan torque is modulated. The default operating mode is Airflow 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.

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 five main operating modes are:

• 1 - Airflow control:

Flow control involves operating the air handling unit to keep the pre-set airflow constant. The speed of the

fans is automatically regulated to provide correct airflow even if the filters begin to become clogged, air

terminals are blocked, etc. Airflow control mode is advantageous, since the airflow 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 filters, 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 airflow setpoints to be configured by the user (m³h K1, m³h K2, m³h K3).

• 2 - Torque control:

3 torque setpoints to be configured by the user (%TQ K1, %TQ K2, %TQ K3). The setpoint is configured

in % of the maximal torque. The torque control allows to vary the fan speed automatically, to

provide a variable airflow for demand controlled systems (DCV). This allows for demand controlled fan operation

or fan optimisation by a BMS system, mostly used in multi zone systems. This operation mode can partially

replace the constant pressure control when a duct pressure sensor hasn’t been installed.

• 3 - Demand control 0-10V:

The airflow is controlled by a 0-10 V signal. The control signal is connected to terminals K2&GND. The assigned

supply airflow is set as a percentage of a linear 0-10 V signal. The user defines 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 airflow (relevant for backwards fans units without Kit CA).

The principle is identical to the demand control mode operation with the difference that Vmin and Vmax are

connected to a %TQ instead of m³/h.

A CO2 sensor option is available for selection when ordering. Once this option is selected, the sensors are

prewired and pre-configured to be ready for use.

• 4 - MODE OFF :

This stops the AHU

Operation and maintenance instruction s – CLASS UNIT TAC5

4.2 TEMPERATURE CONTROL

There are several options available on CLASS UNIT units to ensure a comfortable temperature. The options are controlled either via supply or extract air temperature.

Supply Air Temperature

Supply temperature control is the default setting. This involves keeping a constant supply air temperature without consideration to the load in the premises. The supply air temperature is measured on sensor T5.

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 premises regardless of the load. The internal sensor T2 can be replaced with the optional external room temperature sensor (CID370042).

Temperature sensor positioning :

12 Operation and maintenance instructio ns – CLASS UNIT TAC5

4.3 CHANGE OVER FUNCTION

4 PIPE AUTOMATIC CHANGE OVER

The TAC controller allows for the control of reversible coil or both cooling and heating coil. The coils are equipped with their motorised 3-way valves. The offset between the measured temperature (supply air or extract air, to be configured) and the setpoint will determine if heating or cooling is automatically activated. When the unit is equipped with reversible coil or with both a cooling and a heating coil, only one setpoint has to be configured: Comfort temperature. The neutral band prevents the cooling and heating systems from counteracting each other. The neutral band is added to the comfort setpoint for the activation of the cooling function. The neutral bands has to be configured in the advanced setup.

Operation and maintenance instruction s – CLASS UNIT TAC5

4.4 FROST PROTECTION

PLATE HEAT EXCHANGER

There are three strategies to protect the plate heat exchanger from freezing :

• 1 - Reduced supply air flow :

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 airflow control mode and demand control, the supply air flow will modulate between 100% and 33% the

• 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 airflow through the heat exchanger

These Settings can be configured in ADVANCED SETUP

4.5 TIME SCHEDULE

The controller allows 6 time slots (channels) to be configured. For each day of the week, the operation mode can be either AUTO (operate according to time slots) or OFF.

For each time slot select :

• In airflow control mode: the airflow by selecting m³h K1 / m³h K2 / m³h K3 / OFF (stop)

• In torque control mode: the torque by selecting %TQ K1 / %TQ K2 / %TQ K3 / OFF (stop)

• In demand control mode :

• with only one 0-10 V signal (default) or with 2 signals to control the

supply airflow: 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 airflow by the supply airflow.

• 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.

• In pressure control mode :

• Constant pressure on supply or exhaust: the pressure setpoint (percentage of the

nominal setpoint) and the rate of the exhaust airflow by the supply airflow.

• Constant pressure on supply and exhaust: one pressure setpoint (percentage of the

nominal setpoint) for supply and one for exhaust.

14 Operation and maintenance instructio ns – 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 configured airflow (low, medium and high) and as a fourth position, the unit is switched off.

Operation and maintenance instruction s – CLASS UNIT TAC5

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:

Maximum length of the cable:

Protection

Dimensions [mm]:

Power consumption:

0... + 50°C

>100 metres

96,8x148,8x14,5

120mA

IMAGE MANAGEMENT

Start-up image

At the first start up, the basic setup menu will be activated automatically. See section 6.1.3

BASIC SETUP

LANGUAGE

UNIT

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

Home Screen. See Section 6.1.1.

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.

Main menu. See Section 6.1.2.

The main menu is presented as a rotary menu. After pressing the “menu”-button at the bottom left corner of the Home Screen, the rotary menu will be shown.

Operation and maintenance instructio ns – 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 normally displayed if no other menu has been selected or if selected from the main menu. The touch screen switches to the sleep mode after 20 minutes. To leave the sleep mode, press on the touchscreen.

On the main screen, the fields are:

• Current operation mode

The operation modes are: STOP, Heating, Cooling, Post ventilation, Freecooling, Frost protection.

Current operation status

• Current date and time

• Active alarms

This fields shows the number of current alarms. By clicking on this field, more detailed information about the different alarms is available

• Menu

Accessing the main menu, see section 6.1.2

Main menu button

• Flow Chart

The flow chart is not editable by the user, the configuration 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 appearence of the image varies depending on the type of air handling unit and its selected functions and/or options. Flow chart symbols:

Number of current alarms

Bypass (closed/open)

Electrical heating coil

Motorised damper

(open/closed/opening)

Operation and maintenance instruction s – CLASS UNIT TAC5

5.1.2 MAIN MENU

The main menu consists of a rotary menu with 7 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/off

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 function or functional component indicated in the alarm text. More information about the individual alarms, see section 7.0

If the fault cannot be immediately remidied:

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. affect the preset operating modes. The controller allows 6 time slots (channels) to be configured.

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 according to EU Standard.

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 off. For each day (Monday -

Sunday), six different time slots can be configured. The time slots are subsequent.

Seasonal management

The seasonal management menu allows for the deactivation of heating coils, cooling coils and bypass freecooling function based upon a year calendar. In between the programmed interval, the selected function is OFF.

Operation and maintenance instructio ns – CLASS UNIT TAC5

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 6.1.3

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

Configuration of service related settings. A maintenance warning interval can be configured as wel as the filter clogging alarm.

Advanced setup

A code and a special training are desired for access to this menu.

BASIC SETUP

LANGUAGE

UNITS

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

Operation and maintenance instruction s – CLASS UNIT TAC5

5.1.3 BASIC SETUP

When the air handling unit is started up for the first time, the commissioning menu is automatically displayed. At the very end of the commissioning (menu) the commissioning of the unit has to be confirmed by the service technician. Once the commissioning has been confirmed, the commissioning menu will not be displayed as first menu any more. The commissioning menu, however, will remain accessible through the advanced setup . See

Section 6.1.4.

Language

The language desired can be set here. The language setting can be changed at any time in the basic setup menu.

Setting

Language

Settings range

Languages as displayed

Factory setting

English

Units

The desired unit can be set here. The unit setting can be changed at any time in the basic setup menu.

Setting

Unit

Settings range m³/h l/s

Factory setting m³/h

Airflow 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, flows can be set as (l/s, m³/h), pressure

(Pa), input signal strenght (%) or torque (%). For both “Airflow control” and “Torque control”, three setpoints are available: Low, medium and high.

Setting

Operating mode

Settings range

OFF

Airflow

Demand control

Pressure

Torque

Factory setting

Airflow

BASIC SETUP

LANGUAGE

UNITS

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

BASIC SETUP

LANGUAGE

UNITS

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

BASIC SETUP

LANGUAGE

UNITS

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

Operation and maintenance instructio ns – CLASS UNIT TAC5

Constant airflow

Flow control involves operating the air handling unit to keep the preset airflow constant. The speed of the fans is automatically regulated to provide correct airflow even if the filters become clogged, diffusers are blocked, etc. The exhaust air fan is controlled as a slave. A ratio between exhaust and supply pressure can be configured in order to create over, under or balanced pressure. For units with backward fans, constant airflow can only be selected if the “constant air kit” has been ordered as an option. The desired setpoint is preset in (l/s, m³/h).

Setting

Airflow K1/K2/K3

Ratio exhaust/supply

Range

0...max

5...999%

Factory setting

100%

Enable pressure alarm No

Yes

DP Supply/Exhaust for pressure alarm

Yes

25...999Pa

200Pa

Initialisation airflow (l/s, m³/h)

Pressure alarm initialisation

Yes

Torque control

The constant torque operating mode allows to vary the fan speed automatically, to provide a variable airflow for demand controlled systems. This operating mode can partially replace the constant pressure control when a duct pressure sensor hasn’t been installed. The exhaust air fan is controlled as a slave. A ratio between exhaust and supply pressure can be configured in order to create over, under or balanced pressure. The desired setpoint is preset in %. The Torque control mode can be deactivated in the advanced setup.

Setting

Airflow K1/K2/K3

Range

0...100%

Ratio exhaust/supply 5...999%

Factory setting

100%

Demand control

The airflow 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 configured with a positive or a negative logic. A ratio between exhaust and supply pressure can be configured 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 occupancy) that will be activated by speed “III “

Setting Range Factory setting

Vmin

Vmax m³/h ~Vmin

0...10V

(l/s, m³/h)

1,0V

10,0V m³/h ~Vmax

Ratio exhaust/supply

(l/s, m³/h)

5...999%

Sleep factor on K3

DP Supply/Exhaust for pressure alarm

10...100%

Enable pressure alarm No

Yes

10...999Pa

Initialisation airflow (l/s, m³/h)

Pressure alarm initialisation

Yes

100%

Yes

200Pa

Yes

Constant pressure

The airflow automatically varies to provide constant pressure in the ducting. The duct pressure is measured by an external in-duct pressure sensor which is connected to the control unit’s BUS communication or the an analogue 0...10V input. The function can be configured on supply air, extract air or supply and extract air. The first two configurations will have the second set of fans be controlled as a slave. A ratio between exhaust and supply pressure can be configured in order to create over, under or balanced pressure. The initialisation will allow for an automatic calculated pressure setpoint, determined by the nominal airflow. The “sleep factor” is a lower operating rate for the unit (due to e.g. low occupancy) that will be activated by speed “III “

Setting Range Factory setting

Supply Control Supply

Exhaust

Supply+Exhaust

Ratio exhaust/supply 5...999%

Sleep factor on K3 10...100%

Pressure initialisation Via Airflow

Via Pressure

Start reference initialisation

Yes

100%

Airflow

Yes

Operation and maintenance instruction s – CLASS UNIT TAC5

Temperature

The temperature control can be configured as a supply air control or an extract air control. By default, this function is configured as a supply air temperature control. Changes to this configuration are done in the advanced setup; see

Section 6.1.4

Setting

T° heating

T° Cooling

T° Freecooling

Settings range

0...45°C

0...99°C

Factory setting

20,0°C

24,0°C

15°C

Fire Alarm

An external fire detection system is used to control the air handling unit in case of emergency. The fire alarm function is activated by means of digital input

IN3.

Setting

Input

Supply airflow

Extract airflow

Settings range

Normally open

Normally closed

0...max

Factory setting

Normally closed

BASIC SETUP

LANGUAGE

UNITS

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

BASIC SETUP

LANGUAGE

UNITS

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

Periodic maintenance

Built-in timer for maintenance warning; if the maintenance interval is exceeded, a maintenance reminder will be displayed.

Setting Settings range

3 monthly warning Yes

12 monthly warning Yes

Factory setting

Commissioning completed

When the commissioning has been successfull and this is confirmed in this menu, the commissionig menu will not be activated automatically anymore.

Setting

Confirmation of successfull commissioning

Settings range

Yes

Factory setting

BASIC SETUP

UNITS

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

PERIODIC MAINTENANCE

BASIC SETUP

AIRFLOW REGULATION

TEMPERATURE

FIRE ALARM

PERIODIC MAINTENANCE

COMMISSIONING COMPLETED

Operation and maintenance instructio ns – CLASS UNIT TAC5

5.1.4 ADVANCED SETUP

N.B.! The appearance and content of this menu varies 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 defined for maximal flexibility. The factory setting is the advised setting, deviating from this setting requires carefull consideration.

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 specified setpoint. The control signal is connected to the analogue input K2.

Setting

Stop if <Vlow

Vlow

Stop if >Vhigh

Vhigh

Settings range

Yes

0...10V

Yes

0...10V

Second 0...10V control signal

Factory setting

Yes

0,8V

Yes

10,0V

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

0...10V on K3?

Control

Settings range

Yes

Exhaust

Supply

Factory setting

Exhaust

Pressure control

Function only availalbe if “pressure control” function has been selected in basic setup. The reaction speed of the fans for the balancing of the constant pressure system can be modified. A higher Setting will result in a faster reaction speed; a lower Setting will result in a slowerreaction speed.

The system can be defined as a negative or a positive logic. A negative logic airflow drops when analogue signal on K2 is > than the setpoint.

Setting Settings range

Reaction speed 0...10

Logic Positive

Negative

Factory setting

Negative

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

STOP FAN WITH 0...10V

2ND 0...10 CONTROL SIGNAL

CONSTANT PRESSURE

SOFT STOP

START TORQUE

Operation and maintenance instruction s – CLASS UNIT TAC5

Stop fan when pressure alarm

Possibility to stop the fans automatically in case of a pressure alarm.

Setting

Stop fans

Settings range

Yes

Factory setting

Start torque

Possibility to change the fans’s starting torque.

Setting

Start Torque

Settings range

0...100%

Deactivate softstop

Factory setting

With this function, the “OFF” function is deactivated.

Setting

Softstop

Settings range

Yes

Factory setting

Temperature

In this menu advanced temperature control parameters can be modified.

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 modified.

A higher Setting will result in a smoother control; a lower Setting will result in a faster reaction speed. but also greater risc of oscillations.

Setting

Supply or Extract temperature control?

Reaction speed

Supply air, min

Settings range

Supply

Extract

1...10

0...20°C

Supply air, max 16...50°C

Stop fan if T°Supply <5°C No

Yes

Factory setting

Supply

15,0°C

28,0°C

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

Operation and maintenance instructio ns – CLASS UNIT TAC5

Boost

The boost mode can be used to force the supply and extract airflow to a higher setpoint, when specific 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

Supply / Extract airflow

Boost activation on

RH on / off

Vmin/max RH on K3

RH ~Vmin/max

Settings range

0...max

Contact

0...100%

0...10V

0...100%

Factory setting

Contact

60% / 40%

2,0V / 9,5V

2% / 95%

Post ventilation

The post ventilation function is used to keep the fans running during a specified laps of time. This function is activated automatically when an electrical heating coil is activated.

Setting

Activation

Time

Settings range

Yes

Factory setting

0...9999sec 90sec

ADVANCED SETUP

DEACTIVATE SOFTSTOP

TEMPERATURE

BOOST

POST VENTILATION

EXTERNAL COILS

ADVANCED SETUP

TEMPERATURE

BOOST

POST VENTILATION

INTERNAL COILS

EXTERNAL COILS

Operation and maintenance instruction s – CLASS UNIT TAC5

Internal coils

Electrical postheating coil

The electrical postheating coil is installed and configured 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 defined by the selected operating mode.

Setting

Control mode

Settings range

Exhaust

Supply

Setpoint -9,9...99,9°C

PID - Proportional Band 0...100

PID - Integral

PID - Derivate

0...100

Factory setting

Supply

21,0°C

Water postheating coil

The water postheating coil is installed and configured in factory. The 3-way valve is not installed and will have to be installed and wired on site. The capacity of the coil will be controlled proportionally in order to keep a temperature as defined by the selected operating mode.

The output O.R.3 on the optional “SAT3” output relay, is activated whenever heating is desired.

Setting

Control mode

Setpoint

Reaction Speed

Settings range

Exhaust

Supply

-9,9...99,9°C

1...10

Factory setting

Supply

21,0°C

Frost protection

Frost protection plate heat exchangers

In environments where the extract air can occasionally 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 preheating coil, differential pressure measurement (cold climate option). If non of these measures are effective, the air handling unit can be stopped by limting the minimal supply air temperature. When the Frost protection cycle is active, it will be indicated on the HMI. The configurable temperatures are exhaust temperatures.

Setting

T° Low

T° High

Stop supply airflow

Frost protection cycle active

Frost protection alarm

Settings range

1...3°C

1...5°C

Yes

Factory setting

+1,0°C

+5,0°C

Yes

ADVANCED SETUP

BOOST

POST VENTILATION

INTERNAL COILS

EXTERNAL COILS

INTERNAL COILS

Operation and maintenance instructio ns – CLASS UNIT TAC5

0-10V output

The controller has as a standard feature two configurable analogue 0...10V outputs. The outputs represent the actual airflow (or torque) or the actual pressure delivered by one of the selected fans.

Setting

Output 1

Output 2

Settings range

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

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

Factory setting

Flow Fan 1

Pressure Fan 1

Modbus configuration

The MODBUS RTU communication requires an additional satellite circuit (CID050043) which is used as communication interface. The communication protocol used is

MODBUS RTU, RS485.

Setting

Adress

Baudrate

Parity

Settings range

1...247

1200

4800

9600

19200

Yes

Factory setting

9600

LAN configuration

The MODBUS TCP/IP communication requires an additional satellite circuit (CID025072) which is used as communication 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

Manual IP configuration DHCP

Manual

IP adress

Netmask

Gatway

192.167.1.1

255.255.255.0

0.0.0.0

Operating time

For maintenance purposes, operating timers can be activated. 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

Reset timer

Settings range

Yes

Factory setting

Fan run time activation No

Yes

Display time No

Yes

Service alarm time

Stop fan

0...999999h

Operation and maintenance instruction s – CLASS UNIT TAC5

6.0 Preventive maintenance

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 corresponding 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:

6.1 ONCE THE UNIT OPERATES IN NORMAL CONDITION

Replace the filters with a kit of replacement filters.

6.2 EVERY 3 MONTHS

- Check for any alarms indicated on the control device. In case of an alarm refer to troubleshooting section.

- Check the state of filter clogging. The control device allows a pre-defined ‘filter alarm’ threshold to be set.

Replace filters if necessary. Filters that are too clogged can generate the following problems:

- Insufficient 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 airflow)

- Unfiltered air passing through the heat exchanger (risk of clogging) and into ventilated rooms.

The list of replacement filter kits for each unit can be downloaded from our website.

- To locate the filter, 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 fins.

• Clean any condensation stains

• Clean any accumulations in the drain pan.

28 Operation and maintenance instructio ns – CLASS UNIT TAC5

6.3 EVERY 12 MONTHS

Fan maintenance:

Check again whether the power supply is shut down and fans are not running.

Inspect and clean the fan impellers to remove any dirt deposits, be careful not to alter the impeller balance

(do not remove balancing clips). Check the impeller to make sure that it is not out of balance. Clean or brush off the

fan motor. It can also be cleaned by carefully wiping it with a damp cloth that has been dipped in a solution of water and

detergent. Clean the fan space, if needed. Remove the fans if necessary.

Check seals on the unit:

Ensure that the side access panels are fully closed and that the seals are intact. Replace if necessary.

Operation and maintenance instruction s – CLASS UNIT TAC5

7.0 Troubleshooting

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

- 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.

- Effects:

B.11

B.12

B.13

B.14

AL1 relay

Alarm

O.R.1

Displayed on HMI TACtouch

Text displayed

Fan 1 failure

Fan 2 failure

Fan 3 failure

Fan 4 failure

TAC control board

LED ALARM

Auto reset: yes

LED AF

LED ALARM

RED

LED Pa

Fans stopped

30 Operation and maintenance instructio ns – CLASS UNIT TAC5

7.2 TYPE 2: ALARM ON THE PRESSURE VARIATION

- Conditions:

• Mode airflow control or demand control. Unit must have forward fans or backward fans with kit CA.

• External pressostat connected on IN2 input

- Causes:

• Pressure alarm setup in airflow control or demand control mode

• External pressostat connected on IN2 input has triggered

- Effects:

P.10

P.20

S.40

Displayed on HMI TACtouch

Text displayed

Pressure alarm - Supply air

Pressure alarm - Extract air

Pressure alarm from Pressure Switch*

LED ALARM LED Pa

/ RED

AL1 relay

O.R.1

Closed

TAC control board

LED ALARM

Auto reset: yes

* unless the status has been changed in advanced setup

LED AF

Fans

Run*

Operation and maintenance instruction s – CLASS UNIT TAC5

7.3 TYPE 3: ALARM REPORT DURING REFERENCE PRESSURE INITIALIZATION

- Conditions:

• Mode Airflow control or Demand control: during the initialization of the pressure alarm. In this case, the unit must have

forward fans or backward fans with kit CA.

• Mode Pressure control: during the initialization of the pressure reference via airflow

- Causes:

The reference pressure (Paref) cannot be identified and the fans are stopped. 4 possibilities:

Actual airflow < requested airflow: The requested working point is ‘too high’ (too high pressure loss)

for the maximal available pressure at the requested airflow for this fan.

Actual airflow > requested airflow: the nominal airflow requested to initialize the pressure alarm

cannot be reached because the lower limit of the fan’s operating zone has been reached.

Very unstable pressure (pumping).

Assigned airflow not reached after 3 minutes.

If this occurs during initializing an alarm pressure, there are 2 options:

No action is taken: the control will operate without a pressure alarm.

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 airflow…) 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 airflow …) and restart the setup operation.

- Effects:

P.20

P.21

P.22

P.23

P.24

P.25

P.26

P.27

Displayed on HMI TACtouch

Text displayed

Initialisation of the reference pressure - Unstable supply air pressure

Initialisation of the reference pressure - Unstable extract air pressure

Initialisation of the reference pressure - Supply air flow too low

Initialisation of the reference pressure - Extract air flow too low

Initialisation of the reference pressure - Supply air flow not reached

Initialisation of the reference pressure - Extract air flow not reached

Initialisation of the reference pressure - Supply air flow too high - Min. limit of the motor

Initialisation of the reference pressure - Extract air flow too high - Min. limit of the motor

LED ALARM LED Pa

RED /

AL1 relay

ALARM

O.R.1

TAC control board

LED ALARM

Auto reset: no

LED AF

Fans

Stopped

32 Operation and maintenance instructio ns – CLASS UNIT TAC5

7.4 TYPE 4: ALARM INDICATING THE SYSTEM CANNOT FULFIL THE SETPOINT

- Conditions:

- Causes:

S.11

S.12

S.13

S.14

S.20

S.21

S.22

S.23

S.24

S.25

S.34

S.35

- Effects:

Displayed on HMI TACtouch

Text displayed

“Constant Pressure” fan 1 - Measured pressure too high - Minimum air flow reached

“Constant Pressure” fan 1 - Measured pressure too low - Maximum air flow reached

“Constant Pressure” fan 3 - Measured pressure too high - Minimum air flow reached

“Constant Pressure” fan 3 - Measured pressure too low - Maximum air flow reached

“Demand control” fan 1 - Air flow too low - Reduce the pressure on this fan

“Demand control” fan 1 - Air flow too high - Minimum limit of the motor reached

“Demand control” fan 2 - Air flow too low - Reduce the pressure on this fan

“Demand control” fan 2 - Air flow too high - Minimum limit of the motor reached

“Demand control” fan 3 - Air flow too low - Reduce the pressure on this fan

“Demand control” fan 3 - Air flow too high - Minimum limit of the motor reached

“Constant Air Flow” fan 3 - Air flow too low - Reduce the pressure on this fan

“Constant Air Flow” fan 3 - Air flow too high - Minimum limit of the motor reached

AL1 relay

O.R.1

TAC control board

LED ALARM

Auto reset: yes

LED AF

LED ALARM LED Pa

RED

Fans

7.5 TYPE 5: ALARM INDICATING A DATA FAILURE IN THE CONTROL CIRCUIT

- Conditions:

- Causes:

• Crucial data from the circuit board has been lost

- Effects:

Displayed on HMI TACtouch

Text displayed LED ALARM

D.10

D.20

Programme Error

Data Error

RED

AL1 relay O.R.1

TAC control board

LED ALARM LED AF

Alarm status / ON

Auto reset: no

- Solutions:

• Try a TOTAL RESET of the data using the advanced setup. If still not resolved, order a new circuit board.

LED Pa

Fans

Stopped

Operation and maintenance instruction s – CLASS UNIT TAC5

7.6 TYPE 6: FIRE ALARM

- Conditions:

• Fire alarm input must be connected to a fire detection system

- Causes:

Activation of fire alarm input, IN3, connected to a fire detection system.

IN3 can be configured to work as NO open contact by default or as NC if configured so in the advanced setup.

- Effects:

Displayed on HMI TACtouch

Text displayed

F.10

F.11

FIRE ALARM

End of the fire alarm

LED ALARM

RED

LED Pa

AL1 relay

Alarm status

O.R.1

TAC control board

LED ALARM

Auto reset: no

LED AF

* The fans are stopped by default in the event of a fire alarm but, via the advanced setup, it is possible to configure a fixed airflow for supply (contact IN7 needs to be closed) and for exhaust

(contact IN8 needs to be closed).

Fans

34 Operation and maintenance instructio ns – CLASS UNIT TAC5

7.7 TYPE 7: MAINTENANCE ALARM

- Conditions:

• the running hours feature must be enabled in advanced setup

- Causes:

• SERVICE ALARM: the fan operating time (in hours) has exceeded the configurable threshold

• STOP FAN: the fan operating time (in hours) has exceeded the configurable threshold. This alarm stops the fans

- Effects:

Displayed on HMI TACtouch

Text displayed LED ALARM LED Pa

M.10

M.11

M.21

M.22

Maintenance 3 months

Maintenance 6 months

Operating hours

Operating hours - AHU off

RED /

AL1 relay

Alarm status

O.R.1

TAC control boards

LED ALARM

LED AF

Reset via “fan run time” (TACtouch) or “alarm menu” (App)

Fans

Stopped if SERVICE STOP

FAN *

* unless the status has been changed in advanced setup

7.8 TYPE 8: ALARM INDICATING A COMMUNICATION BREAKDOWN

BETWEEN THE TAC CIRCUIT AND THE HMI

- Conditions:

• User interface is connected

- Causes:

• Communications failure between the TAC circuit and the HMI

- Effects:

CB COM ERROR

Text displayed

Displayed on HMI TACtouch

LED ALARM

Red

LED Pa

AL1 relay

Alarm status

O.R.1

TAC control board

LED ALARM

Auto reset: yes

LED AF

Fans

Operation and maintenance instruction s – CLASS UNIT TAC5

7.9 TYPE 9: ALARM INDICATING A T° SENSOR T1/T2/T3 FAILURE

T.10

T.11

T.20

T.21

T.30

T.31

- Conditions:

- Causes:

One or more of the T° sensors T1/T2/T3 connected to the TAC circuit and mounted on heat exchanger is

defect or not connected. These sensors are needed for the bypass control and the anti-frost procedure.

- Effects:

Displayed on HMI TACtouch

Text displayed LED ALARM

Sensor T1 disconnected

Sensor T1 short circuit

Sensor T2 disconnected

Sensor T2 short circuit

Sensor T3 disconnected

Sensor T3 short circuit

RED

AL1 relay

Alarm status

O.R.1

TAC control board

LED ALARM

Manual reset mandatory.

LED AF

LED Pa

Fans

Stopped

7.10 TYPE 10: ALARM INDICATING FAILURE ON T° SENSOR T4

- Conditions:

• Only with internal water heating coil (IBA) option

- Causes:

• T° sensor T4 located on the coil and connected to the TAC circuit is defective (open or short circuit) or not connected.

This is used to prevent frosting of the internal heating coil. In this case, as a safety measure, the 3-way valve is

opened and the circulator contact is closed.

- Effects:

Displayed on HMI TACtouch

Text displayed LED ALARM LED Pa

T.40

T.41

Sensor T4 disconnected

Sensor T4 short circuit

RED /

AL1 relay

Alarm status

O.R.1

TAC control board

LED ALARM

Manual reset mandatory.

* unless the status has been changed in advanced setup

LED AF

Fans

36 Operation and maintenance instructio ns – CLASS UNIT TAC5

7.11 TYPE 10 BIS: DRAIN PUMP ALARM

- 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

- Effects:

Displayed on HMI TACtouch

Text displayed

R.10

Condensate tray full

LED ALARM

RED

LED Pa

AL1 relay O.R.1

TAC control board

LED ALARM LED AF

Alarm status / ON /

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.

Fans

Stopped if SERVICE STOP

FAN

7.12 TYPE 11: ALARM INDICATING FAILURE ON T° SENSOR T5

- Conditions:

• Only with post-heating, post-cooling or free cooling with heat wheel or modulating bypass option

- Causes:

• T° sensor T5 located in the supply duct 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.

- Effects:

Displayed on HMI TACtouch

Text displayed LED ALARM LED Pa

T.50

T.51

Sensor T5 disconnected

Sensor T5 short circuit

RED /

AL1 relay

Alarm status

O.R.1

TAC control board

LED ALARM

Manual reset mandatory.

LED AF

Fans

Operation and maintenance instruction s – CLASS UNIT TAC5

7.13 TYPE 12: ALARM INDICATING THAT THE COMFORT T° IS TOO LOW RELATIVE TO SETPOINT T°

- 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.)

- Effects:

S.50

Displayed on HMI TACtouch

Text displayed

Post-heating - T° of the supply air too low

LED ALARM

RED

LED Pa

AL1 relay

O.R.1

TAC control board

LED ALARM

Auto reset: yes

LED AF

Fans

7.14 TYPE 13: ALARM INDICATING HEAT EXCHANGER FROST PROTECTION ALERT

- Conditions:

• Only with post-heating option

- Causes:

Frost protection is only selected with electrical pre-heating coil (KWin) or water preheating coil (BAin) or modulating bypass.

With KWin or BAin option: In certain air T° conditions as measured on the exhaust airflow after 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° < assignment T°-1,5°C for more than 5 minutes: supply and exhaust airflow reduction of 33% if airflow control or

demand control and of 25%

if pressure control mode, for 15 minutes.

- Effects:

Displayed on HMI TACtouch

A.10

Anti-freeze - Reduced air flows

Text displayed LED ALARM

RED

LED Pa

AL1 relay

O.R.1

TAC control board

LED ALARM

Auto reset: yes

LED AF

Fans

38 Operation and maintenance instructio ns – CLASS UNIT TAC5

7.15 TYPE 14: ALARM INDICATING FROST PROTECTION ALERT – FANS STOPPED T°

- Conditions:

• Frost protection is only selected for 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 airflow after 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 after that the bypass has been opened at 100%.

- Effects:

Displayed on HMI TACtouch

Text displayed LED ALARM LED Pa

A.11

Anti-freeze - Fans stopped RED /

AL1 relay

Alarm status

O.R.1

TAC control board

LED ALARM

Manual reset mandatory.

LED AF

Blinking

7.17 TYPE 15 BIS: ALARM INDICATING THAT THE COMFORT T° IS TOO HIGH

RELATIVE TO SETPOINT T°

- Conditions:

• Only with post cooling 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 cooling is at maximum).

- Effects:

Fans

Stopped

S.60

Displayed on HMI TACtouch

Text displayed

Post-cooling - T° of the supply air too high

LED ALARM

RED

LED Pa

AL1 relay

O.R.1 relay of SAT3

TAC control board

LED ALARM

Auto reset: yes

LED AF

Fans

Operation and maintenance instruction s – CLASS UNIT TAC5

7.18 TYPE 16: ALARM INDICATING THAT THE SUPPLY T° IS TOO LOW

- 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 configurable through the advanced setup and is disabled by default.

- Effects:

S.50

S.60

Displayed on HMI TACtouch

Text displayed

Post-heating - T° of the supply air too low

Supply air T° too low - Fan stopped

LED ALARM

RED

AL1 relay

Alarm Status

O.R.1

TAC control board

LED ALARM

Manual reset mandatory.

LED AF

Fans

Stopped

LED Pa

7.19 TYPE 17: ALARM INDICATING HYDRAULIC COILS FROST PROTECTION ALERT

- Conditions:

• Only with internal hydraulic post heating coil (IBA), or external heating coil (EBA)

- Causes:

• Indicates that the anti-frost protection temperature of the hydraulic coil is lower than 4°C (configurable through

advanced setup, it is important to reduce this Setting for BAin coil if an antifreeze is in the fluid). The 3-way valve is

automatically opened at 100% for 15 minutes and the heating demand contact is closed (output SAT3 O.R.3). If the

AHU is running, the alarm is sent after 2 minutes for a preheating coil and immediately for the others; if the AHU is not

running, the alarm is sent after 5 minutes.

- Effects:

Displayed on HMI TACtouch

LED ALARM LED Pa

A.40

A.41

A.42

A.43

Text displayed

Anti-freeze protection of the internal post-heater (IBA)

Anti-freeze protection of the waterborne post-heater (EBA+)

Anti-freeze protection of the waterborne post-cooler (EBA-)

Anti-freeze protection of the waterborne reversible coil (EBA+-)

Red /

AL1 relay

Alarm Status

O.R.1

TAC control board

LED ALARM

Manual reset mandatory.

LED AF

Fans

Stopped

40 Operation and maintenance instructio ns – CLASS UNIT TAC5

7.20 TYPE 18: ALARM INDICATING AN INCORRECT POSITION OF THE MODULATING

BYPASS RELATIVE TO THE ORDERED POSITION

- 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 verified by a visual inspection of the bypass

- Effects:

B.20

Displayed on HMI TACtouch

Text displayed

Position of the modulating bypass incorrect

LED ALARM

RED

LED Pa

AL1 relay

Alarm Status

O.R.1

TAC control board

LED ALARM

Manual reset mandatory.

LED AF

Fans

Stopped

7.21 TYPE 19: ALARM INDICATING THAT THE HOURS LIMIT FOR THE MAINTENANCE OF

THE FILTERS HAS BEEN REACHED

- Conditions:

• The basic setup parameter “Filters Resets” must be >0

- Causes:

• Alarm indicating that the hours limit for the maintenance of the filters has been reached

- Effects:

Text displayed

FILTERS ALARM

Displayed on HMI TACtouch

LED ALARM

Red

LED Pa

AL1 relay

O.R.1

TAC control board

LED ALARM

Auto reset: via dedicated reset

LED AF

Fans

Operation and maintenance instruction s – CLASS UNIT TAC5

7.22 TYPE 20: ALARM INDICATING THAT THE DEFROST PROCESS IS ACTIVE

- Conditions:

• Unit with counter flow heat exchanger

- Causes:

• The ice forming inside of the plate heat exchanger is genrating a pressure drop that is to high for the current airflow.

This detection requires a Modbus pressure sensor placed on the heat exchanger and that the modulation

of the fans speed is based on the airflow and not on torque

• When the previous detection is not available, the supply T° is checked and if it falls below 11°C, it is considered

that is due to the ice that reduces the heat exchanger efficiency

- Effects:

A.20

Defrost

Displayed on HMI TACtouch

Text displayed LED ALARM

RED

LED Pa

AL1 relay

O.R.1

TAC control board

LED ALARM

Auto reset: yes

7.23 REC TABLE

In the control board the “REC type” is used to define the type unit. When replacing the control board, the REC type needs to be configured in the product setup menu. The product setup menu is used to enable specific features or to modify factory settings. This must be done by an accredited technician. A code and special training is mandatory to access this menu group. The table below is valid for controllers generation TAC.

RANGE

CLASS UNIT

SIZE

Unique

TAC DG

884229

LED AF

Fans

Supply stopped

42 Operation and maintenance instructio ns – CLASS UNIT TAC5

.0 Parameters/Commissioning Sheet

Please enter all settings specific 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

CLASS UNIT mo-

del:

Operating mode:

O Constant Airflow

O Demand control

Constant Airflow:

Constant Torque:

Demand control:

Constant pressure:

Ratio exhaust / supply:

K1 =

K2 =

K3 =

K1 =

K2 =

K3 =

Vmin =

Vmax = m³h / %TQ Vmin = m³h / %TQ Vmax =

% on K3 =

Assignment Pa =

% on K3 =

If KWin option:

T° KWin =

O Constant Torque

O Constant pressure

O [m³/h] O [l/s]

% Torque

O [m³/h] O [l/s]

O [V] O [Pa]

°C

KWout

T° KWout = °C

Operation and maintenance instruction s – CLASS UNIT TAC5

8.2 TRACK CHANGES

Enter details when the Setting of a parameter has been changed (use only one row per parameter):

Parameter Name

Setting before change

Setting of change #1

Date of change #1

Setting of change #2

Date of change #2

44 Operation and maintenance instructio ns – CLASS UNIT TAC5

EC DECLARATION OF CONFORMITY

Manufacturer (and where appropriate his authorized representative):

Company: Swegon Operations Belgium

Address: Parc-industriel de Sauvenière 102 Chaussée de Tirlemont

B5030 Gembloux

Hereby declares that:

Following product range(s): GLOBAL PX (TOP) / GLOBAL RX (TOP) / GLOBAL LP (OUT)/

CLASS UNIT / MURAL

Complies with the requirements of Machinery Directive 2006/42/EC (LVD included)

Complies also with applicable requirements of the following EC directives:

2014/30/EU EMC

2009/125/EC

2011/65/EU

Ecodesign (Regulation nr 1253/2014 – LOT 6)

RoHS 2 (including amendment 2015/863/EU – RoHS 3)

Authorized to compile the technical file:

Name: Nicolas Pary

Address: Parc-industriel de Sauvenière 102 Chaussée de Tirlemont

B5030 Gembloux

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Gembloux 2021-05-17

Jean-Yves Renard

R&D Director

Operation and maintenance instruction s – CLASS UNIT TAC5

46 Operation and maintenance instructio ns – CLASS UNIT TAC5

Version: 20220414

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