Salda Mcb User manual

MCB

MINI MCB

EN TECHNICAL MANUAL

2 | EN MCB_miniMCB v2019.1

2. GENERAL 4

3. SAFETY INSTRUCTIONS AND ALARMS 4

3.1. DANGER 4

3.2. ALARMS 4

4. TRANSPORTATION AND STORAGE RULES 4

5. FUNCTIONAL DESCRIPTION 4

5.1. SYSTEM MODES 4

5.2. SYSTEM CONTROL 5

5.3. SYSTEM STATES 5

5.4. INDICATIONS OF FUNCTIONS, ALARMS AND WARN-

INGS 6

5.5. SETTING DATE AND TIME 6

5.6. WEEKLY SCHEDULE 6

5.7. HOLIDAY SCHEDULE 6

5.8. WINTER/SUMMER MODE 7

5.9. BOOST FUNCTION 7

5.10. HUMIDITY CONTROL 7

5.10.1. AIR FLOWS CONTROL ACCORDING TO EX-

TRACT AIR HUMIDITY 7

5.10.2. DRYNESS PROTECTION 7

5.11. NIGHT COOLING FUNCTION 7

5.12. AIR FILTER TIMER 7

5.13. DISPLAY AND CANCELLATION OF ALARMS AND

WARNINGS 8

5.14. EVENT LOG (HISTORY) 8

5.15. SYSTEM VERSIONS AND RUNNING TIME 9

5.16. AIR FLOW ADJUSTMENT 9

5.17. PID CONTROLLER ADJUSTMENT 9

5.18. MANUAL CONTROL OF COMPONENTS 9

5.19. SYSTEM MONITORING 9

5.20. MODULE IDENTIFICATION 9

5.21. STAND-BY MODE BLOCKING 9

5.22. AUTOMATIC CANCELLATION OF FAILURE WARN-

INGS 10

5.23. SUPPLY AIR TEMPERATURE CONTROL AND COM-

PENSATION 10

5.24. SUPPLY AIR TEMPERATURE LIMITS 10

5.25. CHANGING OF TEMPERATURE SETTINGS ACCORD-

ING TO HEATING SEASON 10

5.26. THE SYSTEM MODE COMMUNICATION WITH EXTER-

NAL CONTACTOR 10

5.27. FAN SPEED DEPENDENCE ON EXTERNAL CONTAC-

TOR 11

5.27.1. FIREPLACE FUNCTION 11

5.28. FILTER PROTECTION 11

5.28.1. FILTER TIMER SETTINGS 11

5.28.2. AIR FILTER PROTECTION BASED ON PRES-

SURE SWITCHES 11

5.29. FIRE PROTECTION FROM AN EXTERNAL CONTAC-

TOR 11

5.30. CO2REDUCTION FUNCTION 11

5.31. CHANGING PASSWORDS 11

5.32. RESTORING FACTORY DEFAULTS 12

5.33. FAN CONTROL 12

5.33.1. FAN PROTECTION BY ROTATING SPEED 12

5.33.2. AIR FLOW PROTECTION BASED ON PRESSURE

5.33.3. PROTECTION OF PREMISES WITH FIREPLACES

5.33.4. SLOWING DOWN AIR-FLOWS BASED ON TEM-

PERATURE 12

5.33.5. CONTINUOUS TEMPERATURE MAINTAINING BY

SLOWING DOWN THE FANS 12

5.33.6. THE MINIMAL OUTDOOR AIR TEMPERATURE OF

THE FREON COOLER/HEATER 12

5.33.7. EXHAUST AIR FAN CONTROL ACCORDING TO

THE SUPPLY AIR FAN 13

5.34. CONTROL OF DAMPERS 13

5.34.1. RECIRCULATION BASED ON SUPPLY AIR TEM-

PERATURE 13

5.34.2. FULL RECIRCULATION FUNCTION 13

5.34.3. OUTDOOR AND SUPPLY AIR RECIRCULATION

DAMPERS 13

5.34.4. TESTING OF FIRE DAMPERS 14

5.35. HEAT EXCHANGER CONTROL 14

5.35.1. COLD-HEAT RECOVERY 14

5.35.2. HEAT EXCHANGER FROST PROTECTION 14

5.35.3. PROTECTION FROM TO HIGH CONDENSATE

LEVEL 15

5.35.4. INDICATION OF BYPASS DAMPER FAULT 15

5.36. HEATERS 16

5.36.1. SUPPLY AIR HEATER 16

5.36.2. ELECTRIC HEATER OVERHEAT PROTECTION 16

5.36.3. COOLING OF ELECTRIC HEATERS 16

5.36.4. WATER HEATER FROST PROTECTION 16

5.36.5. PROTECTION OF WATER HEATER CIRCULA-

TION PUMPS 16

5.36.6. OUTDOOR AIR PRE-HEATER 16

5.36.7. OUTDOOR AIR WATER PRE-HEATER FROST

PROTECTION 17

5.37. COOLERS 17

5.37.1. WATER COOLER 17

5.37.2. FREON COOLER 17

5.37.3. THE MINIMAL OUTDOOR AIR TEMPERATURE OF

THE FREON COOLER/HEATER 17

5.37.4. THE FREON COOLER/HEATER AIR FLOW PRO-

TECTION 17

5.37.5. AUTOMATIC ADJUSTMENT OF DEFROST INTER-

VALS OF THE FREON COOLER/HEATER 17

5.38. DIGITAL INPUT CONFIGURATION 17

5.39. SENSOR CONFIGURATION 17

5.39.1. SENSORS ADJUSTING 18

5.39.2. MODBUS SENSORS 18

5.39.3. PRESSURE LIMITS TO EACH MODE 18

5.40. COMMUNICATIONS LINE CONFIGURATION 18

5.41. CONFIGURATION OF MODULES 18

5.42. COOKING HOOD FAILURE INDICATION 19

5.43. CONTROLLER BOX TEMPERATURE MAINTAINING 19

5.44. LOG-IN SESSIONS ARE LIMITED BY A TIME INTER-

VAL 19

6. CONNECTION OF BOARD DIAGRAM AND PERIPH-

ERALS 19

6.1. MINI MCB BOARD PINOUT DESTINATION 19

6.2. MCB, EX1 AND EX2 CONTROLLER’S I/O LIST 22

6.3. CONNECTION OF MCB MAIN BOARD 26

6.3.1. CONNECTION OF FDI_TACHO INPUTS (MCB) 26

6.3.2. CONNECTION OF HOLO_IN (MCB) 26

6.3.3. CONNECTION OF DIGITAL INPUTS (DI) (MCB) 27

6.3.4. CONNECTION OF TEMPERATURE-ANALOGUE

INPUTS (AI NTC) (MCB) 27

6.3.5. CONNECTION OF ANALOGUE 0-10V (AI 0-10 V)

INPUT (MCB) 27

6.3.6. CONNECTION AND CONFIGURATION OF

RS422/485 COMMUNICATIONS (MCB) 27

6.3.7. CONNECTION OF RS485 COMMUNICATIONS

(MCB) 27

6.3.8. CONNECTION OF RECIRCULATION DAMPER (RE-

CIRCULATION ACTUATOR) (MCB) 27

6.3.9. CONNECTION OF BYPASS DAMPER (BYPASS

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ACTUATOR) (MCB) 28

6.3.10. CONNECTION OF WATER HEATER VALVE (WA-

TER HEATER ACTUATOR) (MCB) 28

6.3.11. CONNECTION OF BYPASS STEPPER DAMPER

(BYPASS STEPPER MOTOR) (MCB) 28

6.3.12. CONNECTION OF ANALOGUE OUTPUTS (AO

0-10 V) (MCB) 28

6.3.13. CONNECTION OF POWER SUPPLY SOURCE

(MCB) 28

6.4. CONNECTION OF MCB EX1 BOARD 29

6.4.1. POWER SUPPLY TO WATER PRE-HEATER AND

COOLER DAMPER (EX1) 29

6.4.2. DIGITAL INPUTS (DI) (EX1) 29

6.4.3. ANALOGUE 0-10V OUTPUTS (AO (0-10 V)) (EX1) 29

6.4.4. CONNECTION OF STEPPER RECIRCULATION

ACTUATOR (EX1) 29

6.4.5. CONNECTION OF INDICATION OUTPUTS (WORK-

ING INDICATION, ALARM INDICATION) (EX1) 30

6.4.6. POWER SUPPLY CONNECTION TO AIR QUALITY

SENSOR (5VDC) (EX1) 30

6.4.7. CONNECTION OF ANALOGUE 0-10V INPUTS (AI

(0-10 V)) (EX1) 30

6.4.8. CONNECTION OF ANALOGUE NTC INPUTS (AI

(NTC)) (EX1) 30

6.4.9. POWER SUPPLY CONNECTION TO AIR QUALITY

SENSORS (24VCD) (EX1) 30

6.5. CONNECTION OF MCB EX2 BOARD 31

6.5.1. CONNECTION OF FIRE DAMPERS (EX2) 31

6.5.2. CONNECTION OF WATER COOLER CIRCULATION

PUMP (EX2) 31

6.5.3. CONNECTION OF CONTROL PANEL HEATER/FAN

(EX2) 32

6.5.4. CONNECTION OF AIR DAMPERS (EX2) 32

6.5.5. CONNECTION OF ROTOR MOTOR (EX2) 32

6.5.6. POWER SUPPLY CONNECTION TO TERMINALS

X32-X36 AND X39 (EX2) 32

6.5.7. POWER SUPPLY/CONTROL CONNECTION TO

ELECTRIC/WATER HEATER OR CONNECTION OF CIRCULA-

TION PUMP (EX2) 32

6.5.8. POWER SUPPLY CONNECTION TO FREON

COOLER (EX2) 32

6.5.9. CONNECTION OF REVERSE CONTROL TO FRE-

ON COOLER (EX2) 33

6.5.10. POWER SUPPLY CONNECTION TO PRE-HEAT-

ER/CONNECTION OF CIRCULATION PUMP (EX2) 33

6.5.11. POWER SUPPLY CONNECTION TO TERMINAL

X42 (EX2) 33

6.5.12. POWER SUPPLY CONNECTION TO SUPPLIED/

EXHAUSTED AIR FANS (EX2) 33

6.5.13. POWER SUPPLY CONNECTION TO TERMINALS

X44 AND X45 (EX2) 33

6.6. CONNECTION OF MINI MCB MAIN BOARD 34

6.6.1. CONNECTION OF HOLO SENSOR (MINI MCB) 34

6.6.2. CONNECTION OF ANALOGUE 0-10V OUTPUTS

(AO (0-10V)) (MINI MCB) 34

6.6.3. CONNECTION OF BYPASS STEPPER DAMPER

ACTUATOR (BYPASS STEP MOTOR CONTROL) (MINI MCB) 34

6.6.4. CONNECTION OF FDI/TACHO INPUTS (MINI MCB)

6.6.5. CONNECTION OF DIGITAL INPUTS (DI) (MINI

MCB) 35

6.6.6. CONNECTION OF ANALOGUE NTC INPUTS (AI

(NTC)) (MINI MCB) 35

6.6.7. CONNECTION OF AIR QUALITY SENSOR (AIR

QUALITY SENSOR) (MINI MCB) 35

6.6.8. CONNECTION OF POWER SUPPLY SOURCE

(MINI MCB) 35

6.6.9. POWER SUPPLY CONNECTION TO ELECTRIC/

WATER HEATER OR CONNECTION OF CIRCULATION PUMP

(MINI MCB) 35

6.6.10. POWER SUPPLY CONNECTION TO TERMINALS

X10 AND X12 (MINI MCB) 35

6.6.11. POWER SUPPLY CONNECTION TO PRE-HEATER

(PREHEATER POWER LINE) (MINI MCB) 36

6.6.12. CONNECTION OF SUPPLY/EXHAUST AIR DAMP-

ERS (MINI MCB) 36

6.6.13. POWER SUPPLY CONNECTION TO ROTOR MO-

TOR (ROTOR MOTOR CONTROL) (MINI MCB) 36

6.6.14. CONNECTION OF FANS (MINI MCB) 36

6.6.15. POWER SUPPLY CONNECTION TO TERMINALS

X13–X16 (MINI MCB) 36

6.7. CONNECTION OF MINIMCB EX1 BOARD 37

6.7.1. CONNECTION OF AIR QUALITY SENSOR (AIR

QUALITY SENSOR) (MINI MCB EX1) 37

6.7.2. CONNECTION OF ANALOGUE OUTPUTS (AO (0-

10V)) (MINI MCB EX1) 37

6.7.3. CONNECTION OF ANALOGUE NTC INPUTS (MINI

MCB EX1) 38

6.7.4. CONNECTION OF INDICATION OUTPUTS (WORK-

ING INDICATION, ALARM INDICATION) (MINI MCB EX1) 38

6.7.5. CONNECTION OF DIGITAL INPUTS (DI) (MINI MCB

EX1) 38

6.7.6. POWER SUPPLY CONNECTION TO AIR QUALITY

SENSOR (5VDC) (MINI MCB EX1) 38

6.8. CONDUCTORS MAXIMUM CROSS-SECTIONS 38

4 | EN MCB_miniMCB v2019.1

2. GENERAL

This manual, dedicated to qualied ventilation or electronics specialists, describes functions, conguration and installation of MCB, MiniMCB

boards to be mounted into air handling units (AHU).

MCB control board consists of the following

› controller MCB (MCB) + controller MCB (EX1)+ controller MCB (EX2).

The MCB control board to be mounted to SMARTY 2RV/2RV plus consists of the following

› controller MCB (REV_C).

MiniMCB control board consists of the following

› controller MiniMCB (main)+ controller MiniMCB (EX1).

MiniMCB control board in addition to pressure switch consists of the following

› controller MiniMCB (main)+ controller MiniMCB (EX1 excl. pressure switches).

MiniMCB basic control board consists of the following

› controller MiniMCB (main).

3. SAFETY INSTRUCTIONS AND ALARMS

Prior to installation and use of the unit, please read this Manual carefully. Installation, connection and maintenance shall be executed by a qualied

specialist considering the local rules, normative acts and practice.

Prior to connecting peripherals to the board, please read the Manual.

The Company shall not assume any liability for personal injuries or damage to property in case of failure to observe these safety requirements, if

the product is modied without manufacturer’s consent

3.1. DANGER

Prior to execution of any electrical or maintenance works make sure the product is disconnected from power supply network.

› Upon noticing any liquid on electrical, energized parts or joints, terminate operation of the device.

› Do not plug the unit to any power outlet except to the one indicated on the label on the casing of the unit.

› The unit mains voltage must comply with the electrotechnical parameters indicated in the label.

Based on the Rules for Installation of Electrical Facilities the product shall be grounded. It is forbidden to plug in and operate it non-grounded.

3.2. ALARMS

Electrical power switching and unit maintenance shall be performed only by qualied employee following the manufacturer manual and applicable

safety instructions.

› To reduce a potential risk during maintenance or installation works appropriate safety clothes shall be worn.

› Electrical power to power mains must be connected via appropriate rating circuit-breaker.

4. TRANSPORTATION AND STORAGE RULES

Automation boards MCB, mini MCB produced by Salda UAB shall be transported and stored by following the following rules:

› Components on the boards are easily vulnerable, therefore it is necessary to protect them against mechanical impact – shocks, crushing,

compression, etc.;

› The boards shall be transported only in rigid cardboard package, wrapped into anti-static bubble lm, protecting against mechanical impact;

› Storage temperature shall be 5-40 °C;

› Storage relative humidity – <70 %; non-condensing;

› It is necessary to avoid entrance of dust and other foreign matter on the boards;

› Only packed boards shall be stored;

› Package shall be protected against direct sunlight;

› After the automation boards are unpacked, they shall be checked for damage during transportation. It is forbidden to install damaged units!!!

› Upon unloading and warehousing the automation boards use the appropriate hoisting equipment to avoid damage and injuries. The units

must not be lifted by holding them by the power cords, connection boxes and automation components.

5. FUNCTIONAL DESCRIPTION

The software installed in the control board includes all the functions indicated in this section, however the unit operation and control depends on

the following:

› Selected remote control panel - all functionality and possibility of conguration is ensured only by MB-Gateway web interface;

› Connected accessories: heaters, dampers, transmitters, etc. (refer to description of purchased ventilation system);

› Internal unit components: heat exchanger type (plate or rotary one), integrated dampers, transmitters, etc. (Refer to section about the se-

lected product components);

› Type of control board - di󰀨erent boards enable connection of other type components (refer to product board diagram).

5.1. SYSTEM MODES

› Stand-by;

› Building protection;

› Economy;

› Comfort.

EN | 5MCB_miniMCB v2019.1

In Stand-by mode the system is shut down for a permissible period (based on the Stand-by mode blocking function settings).

The Building protection mode is designed to protect premises against moisture accumulation. The system operates at speed 1. Based

on manufacturer’s parameters (by default) this mode controls the temperature (the desirable one is indicated), but, if necessary, it can be

switched o󰀨, i.e. to activate the energy saving mode. Also, if necessary, full recirculation function is activated. (ADJUSTER › USER SETTINGS ›

BUILDING PROTECTION MODE TEMPERATURE or USER › MENU › SETTINGS › BUILDING PROTECTION).

After activating the energy saving mode, temperature is maintained only by the heat exchanger. It will seek to maintain the current temper-

ature in the room; however, if the supply air temperature falls below the minimal supply air temperature level, heaters will be activated and

they will maintain a temperature one degree above the minimum. Also, if the supply air temperature rises above the maximal supply air

temperature level, coolers will be activated and they will maintain a temperature one degree below the maximum.

Economy mode is designed to save energy when people are absent from the premises. The system operates at speed 2. Based on manu-

facturer’s parameters this mode controls the temperature maintaining (the desirable one is indicated), but, if necessary, it can be switched

o󰀨, i.e. to activate the energy saving mode. Also full recirculation function is activated. (ADJUSTER › USER SETTINGS › ECONOMY MODE TEMPER-

ATURE or USER › MENU › SETTINGS › ECONOMY MODE).

Comfort mode is running when people are present in the premises. The system operates at speed 3. In this mode the temperature is always

maintained – it is set in the main window (ADJUSTER › VENTILATION CONTROL or USER › SET POINT).

In each of these modes, a xed position for the recirculation dampers can be set (ADJUSTER › USER SETTINGS › FIXED RECIRCULATION POSITION)

5.2. SYSTEM CONTROL

System modes are changed by the following functions (indicated in a sequential order):

› Weekly Schedule;

› Switching on is activated from an external contactor;

› Manual mode selection;

› Holiday Schedule;

› Stand-by mode blocking.

Based on the Weekly Schedule the system decides in what mode it will be operating; however, the user may change it manually. The system

informs when the next mode change is scheduled. After power loss the mode is selected based on the Weekly Schedule; however, if it is not set,

the mode that was set before the power loss will be activated.

The user may change modes even when the switching on is activated from an external contactor. The only case when it is not possible – active

period of Holiday Schedule of which the system informs and which must be changed to avoid blocking.

Stand-by mode can be blocked by selected parameters. If at least one of the above functions changes its mode into Stand-by mode, it must be

checked whether this mode is not currently blocked. If it is blocked, the previous mode shall be activated.

The function order is provided below.

START >

› READING OF INPUT DATA;

› WEEKLY SCHEDULE;

› MODE EXTERNAL SWITCH;

› USER ENTERED DATA;

› HOLIDAY SCHEDULE;

› STAND-BY MODE SCHEDULE;

› STAND-BY MODE BLOCKING;

› PROTECTION AGAINST DRYNESS;

› BOOST VENTILATION;

› AIR HANDLING UNIT OPERATING ALGORITHM;

› PROTECTION;

› BLOCKING OF AIR HANDLING UNIT OPERATING ALGORITHM;

› MANUAL CONTROL OF COMPONENTS;

› DATA ENTERING INTO OUTPUTS AND USER ENVIRONMENT.

END <

5.3. SYSTEM STATES

This eld informs a user about the existing system state. It is displayed in the main window ADJUSTER › VENTILATION CONTROL or the main window

of the user environment. The table below shows possible system states.

SYSTEM STATE DESCRIPTION

Stand-by mode System operates in Stand-by mode.

Building protection mode System operates in Building protection mode

Economy mode System operates in Economy mode

Comfort mode System operates in comfort mode

Emergency run System operates in emergency mode (for details refer to alarms section)

Preparing System is preparing for operation (pre-heating of water heaters, etc.)

Opening dampers Dampers are opened

BOOST function activated BOOST function is active

Cooling heaters Electric heaters are cooled down prior to shutdown of fans

6 | EN MCB_miniMCB v2019.1

Closing dampers Dampers are closed

Night cooling Active night cooling

Critical alarm Critical failure, system is shut down (for details refer to alarms section)

Fire alarm Fire protection from an external contactor is activated

Heat exchanger frost protection activated Heat exchanger frost protection is activated

Change lters Warning about clogged lters (pressure switches are activated or lter timer

is activated)

Room RH 3 days average is lower than 30%. Limiting speed. Reduced airow because of too low exhaust air moisture

DX cooler defrosting Dissolving the DX cooler / heater

Fire damper testing Checking re dampers

5.4. INDICATIONS OF FUNCTIONS, ALARMS AND WARNINGS

User about active functions, warnings or alarms is notied in the window ADJUSTER › ALARMS or USER › ALERT. Functions are displayed in the main

window ADJUSTER › VENTILATION CONTROL or in the user environment window. The table below provides indications and their descriptions.

FUNCTIONS DESCRIPTION

Working indication output Working indication output is activated

Alarm indication output Failure indication output is activated

System mode switch Switching on from an external contactor is activated

Custom fans speed switch Selected fans speed from an external contactor is activated

Winter Winter mode is active

Stand-by mode blocking

activated Stand-by mode blocking is activated

Slowing down fans Fans are slowed down

Slowing down fans by tem-

perature Fans are slowed down depending on supply air temperature

Night cooling function acti-

vated Night cooling function is activated

Hydronic pump exercise

activated Preventive maintenance of circulation pumps is activated

Service stop function Blocking of air handling unit operating algorithm; Service activities are carried out

Holidays Holiday Schedule interval is active. System mode can be changed only upon changing the Holiday

Schedule interval

Reducing CO2 level CO2 reduction function is activated

Full recirculation Full recirculation function is activated

5.5. SETTING DATE AND TIME

For smooth execution of schedules, event log and winter/summer function, it is necessary to set proper date and time in section ADJUSTER › USER

SETTINGS › DATE AND TIME SET and click a button DATE AND TIME SET. It can also be indicated in user environment USER › MENU › SETTINGS › DATE AND

TIME. Fast synchronization with the computer time is possible in user and adjuster environment.

5.6. WEEKLY SCHEDULE

A weekly schedule consists of 10 weekly events. They can be added, deleted, activated and deactivated. One event indicates time, mode/BOOST

function, days of the week. Also it is possible to indicate the change of settable mode temperature.

The system changes modes according to the Weekly Schedule only when the indicated time comes, therefore a user can always change the

existing mode manually. This schedule noties of the upcoming mode change by indicating the time remaining till the next event.

The schedule is edited in user environment USER › MENU › SCHEDULE.

5.7. HOLIDAY SCHEDULE

This schedule is used when the unit has to operate in uniform mode during holidays. The user interface shows when the schedule period is active

as nobody can change the mode activated by this function (except for protection). In order to control the system in a normal manner, the Holiday

Schedule period must be deactivated, i. e. zero values must be indicated or dates must be changed. Up to ve holiday periods can be set.

The schedule is edited in the user environment USER › MENU › HOLIDAY.

EN | 7MCB_miniMCB v2019.1

5.8. WINTER/SUMMER MODE

The winter/summer function is set during the cold periods, because some parts of the system have to be protected against cold outdoor air. During

winter it is recommended to leave the unit switched on, therefore it is possible to set blocking of switch-o󰀨. Water heaters must be always switched

on during the entire winter.

The winter mode may be indicated

› Manually;

› By date;

› Based on 3-day mean outdoor temperature, to be calculated only when the fresh air (outdoor) pre-heater is o󰀨.

5.9. BOOST FUNCTION

Boost ventilation function is used for fast ventilation of premises. It activates the maximum air-ow (speed 4). Boost ventilation has be temporary,

i.e. it must be a nal condition (e.g. CO2 limit, time). The reason for this limitation – protection against dryness. High air ow reduces humidity, and

dry air is harmful for health.

The function is activated by pressing ON and deactivated by pressing OFF button in the BOOST section, or by means of an external contactor (FANS

SPEED SWITCH), which is congured in the service environment (SERVICE › MAIN › FANS SPEED SWITCH) section.

The function is inactive when Stand-by mode is on. Time limit is indicated (ADJUSTER › USER SETTINGS › BOOST TIMER or USER › MENU › SETTINGS ›

BOOST TIMER). Once the function is activated, the time is set by the timer and the time is counted till its deactivation. It may be adjusted in real-time,

i.e. when the function is on, in ADJUSTER › VENTILATION CONTROL or in the user environment main window.

5.10. HUMIDITY CONTROL

5.10.1. AIR FLOWS CONTROL ACCORDING TO EXTRACT AIR HUMIDITY

When this function is turned on, the winter and summer humidity limits are indicated. If the 3-day average value of extract air humidity exceeds

the set limit, the air ow is increased by one speed and the moment humidity rise is set on the basis of the 3-day average value. Otherwise, the

moment humidity rise is established according to the set limit.

If the moment extract air humidity exceeds the set limit by more than 10 % for more than 5 minutes, then the moisture excess removal (intensive

ventilation) is activated for the specied time period (30 minutes).

5.10.2. DRYNESS PROTECTION

This function is designed to protect premises against dryness. If the function is active, it calculates the 3-day mean humidity of extract air from the

premises. If the mean drops below set limit (30 %), fans start operating in speed 2 in comfort mode. A user is notied of the activated protection

and limited air ow.

If the humidity mean exceeds set limit (30 %) or the function is switched o󰀨 manually, fans start operating in speed 3 in comfort mode.

The function is switched on/o󰀨 in the section ADJUSTER › USER SETTINGS › DRYNESS PROTECTION or in the window USER › MENU › SETTINGS › OTHER.

5.11. NIGHT COOLING FUNCTION

This function is designed to save energy in the morning, when a fresh night air is used to cool down the building. The function is active only in

summer. If it is switched on but not active yet, activation conditions are checked:

› System time from function start to the end (hours/minutes);

› Time is exactly every hour since the start;

› If STAND-BY MODE is set, the unit operates in BUILDING PROTECTION MODE for 5 minutes so that the actual temperature data is available. The

temperature is checked after purging. If it is not suitable, the unit returns to STAND-BY MODE;

› Outdoor temperature is higher than the set outdoor temperature;

› Exhaust air temperature is higher than the set temperature;

› Exhaust air temperature is higher than the outdoor temperature by at least 2 °C;

› Summer.

If all conditions are met the unit starts operating in COMFORT MODE (without temperature maintaining). The main window shows that the Night

cooling function is active. When it is active continuously, the deactivation conditions are checked:

› Time does not correspond to the start/end interval;

› Exhaust air temperature drops below the set temperature;

› Outdoor temperature drops below the set temperature;

› Mode other than COMFORT was switched or the unit has been shut down.

If at least one condition is met, the unit switches o󰀨 the Night cooling function and it switches to the mode that was on prior to activating the

function. The function is congured in the section ADJUSTER › USER SETTINGS › NIGHT COOLING FUNCTION or in the window USER › MENU › SETTINGS

› NIGHT COOLINGS.

5.12. AIR FILTER TIMER

The air lter timer indicates to the user when the lters are clogged. After their replacement, the timer must be reset. The user can always see

how many days are left till the lter replacement. The timer limit can be set in the service environment. Maximum permissible time – 1 year. It is

calculated only when the fans are rotating.

The lter timer can be reviewed and reset in the section ADJUSTER › USER SETTINGS › FILTERS TIMER or in the window USER › MENU › SETTINGS ›

FILTERS TIMER.

The time limit is indicated in the service environment SERVICE › MAIN › AIR FILTERS PROTECTIONS.

8 | EN MCB_miniMCB v2019.1

5.13. DISPLAY AND CANCELLATION OF ALARMS AND WARNINGS

The system noties the user about the system failures by warnings that are canceled automatically and by alarms that have to be canceled man-

ually. The latter are recommended to be canceled by a specialist prior to nding out the causes of the alarm. Information on alarms and warnings

is also displayed in the main window ADJUSTER › VENTILATION CONTROL. If at least one alarm is active, the system is shut down and external failure

indication is activated. Alarms and warnings can be reviewed and canceled in the window ADJUSTER › ALARMS or USER › ALERT. All possible alarms

and warnings are provided in the table below.

INDICATION ALARMS LIST INDICATION ALARMS LIST

. Warning! Rotor broken belt alarm A.3 Alarm! Controller cabinet temperature sensor fail-

ure. System stopped

A.2 Alarm! Fireplace protection activated .32 Fire damper test OK

.3 Warning! Dryness protection activated .33 Warning! Fire damper test failed

. Warning! Plate heat exchanger frost protection

activated A.3 Alarm! Heater manual protection. System stopped!

A.5 Alarm! Plate heat exchanger frost protection system

stopped .35 Warning! Heater automatic protection

.6 Warning! Plate heat exchanger frost protection (pres-

sure relay) A.36 Alarm! Pre-heater manual protection. System

stopped!

A.7 Alarm! Hydronic heater frost protection. System

stopped .37 Warning! Pre-heater automatic protection

. Warning! Too low supply temperature A.3 Alarm! Supply fan failure

. Warning! Too high supply temperature A.3 Alarm! Extract fan failure

A. Alarm! Too low supply temperature. System stopped . Warning! DX cooler failure

A. Alarm! Too high supply temperature. System stopped A. Alarm! Fire

.2 Warning! Change supply air lter (pressure relay) A.2 Alarm! Supply fan pressure protection. System

stopped

.3 Warning! Change extract air lter (pressure relay) A.3 Alarm! Extract fan pressure protection. System

stopped.

. Warning! Change supply and extract lters (timeout) A. Alarm! Internal system error.

A.5 Alarm! Power supply failure. Please, check F1 fuse A.5 Alarm! Heater manual protection. Boosting.

.6 Warning! Supply air temperature sensor failure.

Emergency run A.6 Alarm! Pre-heater manual protection. Boosting.

.7 Warning! Extract air temperature sensor failure.

Emergency run A.7 Alarm! Internal communication error

. Warning! Exhaust air temperature sensor failure.

Emergency run . Warning! DX cooler defrosting

. Warning! Outdoor air temperature sensor failure.

Emergency run . Warning! Too high 3 days extract humidity. Increas-

ing air ow.

.2 Warning! Hydronic heater water temperature sensor

failure. Emergency run .5 Warning! Too high extract humidity. Boosting.

.2 Warning! Hydronic pre-heater water temperature sen-

sor failure. Emergency run A.5 Alarm! Rotor broken belt alarm. System stopped.

.22 Warning! Hydronic cooler water temperature sensor

failure. Emergency run .52 Warning! Gas heater failure

.23 Warning! Controller cabinet temperature sensor

failure. Emergency run .53 Warning! Gas pre-heater failure

A.2 Alarm! Supply air temperature sensor failure. System

stopped .5 Warning! Too high condensation level

A.25 Alarm! Extract air temperature sensor failure. System

stopped .55 Warning! Supply fan failure. Emergency run

A.26 Alarm! Exhaust air temperature sensor failure. Sys-

tem stopped .56 Warning! Extract fan failure. Emergency run

A.27 Alarm! Outdoor air temperature sensor failure. Sys-

tem stopped .57 Warning! Too low supply air ow for DX cooler

A.2 Alarm! Hydronic heater water temperature sensor

failure. System stopped A.5 Alarm! Bypass damper failure. System stopped.

A.2 Alarm! Hydronic pre-heater water temperature sensor

failure. System stopped A.5 Alarm! Hydronic heater/pre-heater circ. pump

failute. System stopped.

A.3 Alarm! Hydronic cooler water temperature sensor

failure. System stopped W.6 Warning! Hydronic heater/pre-heater circ. pump

failute.

5.14. EVENT LOG (HISTORY)

The system records 50 recent events (failures, alarms, re damper testing results, etc.).

The log stores the description of events and time.

The event log may be reviewed in the window ADJUSTER › HISTORY or USER › MENU › HISTORY.

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5.15. SYSTEM VERSIONS AND RUNNING TIME

In the section ADJUSTER › USER SETTINGS › ABOUT you may see software and conguration versions that are saved in the production line namely

to every unit. Next to them the running time since the unit has been manufactured is also displayed. It is calculated when the fans are rotating.

5.16. AIR FLOW ADJUSTMENT

Air-ows are adjusted in the adjuster environment window ADJUSTER › AIR FLOWS ADJUSTING. There are 4 of them in the system and they are

dedicated to specic mode:

› Building protection;

› Economy;

› Comfort;

› Maximum power (BOOST FUNCTION).

Air-ows are arranged in an ascending order, i.e. upon setting lower air-ow in COMFORT MODE than in ECONOMY MODE, the air-ow of the latter is

reduced automatically. With respect to the system conguration, air-ows are indicated in percentage, pressure or amounts of air. 100 % value of

air-ow is indicated in service environment window SERVICE › FANS › FAN SPEED CONTROL.

5.17. PID CONTROLLER ADJUSTMENT

In the adjuster environment window ADJUSTER › PID CONTROLLERS ADJUSTING the coe󰀩cients of the existing PID controllers are adjusted. The

amount depends on the system conguration. If the system operation for any reasons is unstable (uctuating), PID coe󰀩cients may be adjusted.

It is recommended that a specialist did this.

5.18. MANUAL CONTROL OF COMPONENTS

This function manually activates/deactivates the components controlled by digital and analogue outputs. The latter ones are controlled in per-

centage, and digital ones – by ON/OFF. Based on manufacturer’s parameters (by default) the status of all components is AUTO, which means that

control is based on air handling unit operating algorithm. Components are displayed by the system conguration. Settings must be saved so they

remain active after power loss.

The lowest power consumption is when the Stand-by mode is on, and position of components – AUTO.

Prior to using the manual control function, it is recommended to activate the force shutdown function, which blocks the air handling unit operating

algorithm.

This can be useful, if you need to check whether everything is properly connected. Moreover, in the event of failure, certain components can be

activated so that the unit operates irrespective of sensors and protections. Of course, this method should be applied in exceptional cases until the

failure is rectied.

If the service environment window SERVICE › SENSORS displays an external (REMOTE) type of a temperature sensor, its temperature may be indi-

cated manually. The values may be indicated via the Modbus interface.

5.19. SYSTEM MONITORING

The service and adjuster environment have the window MONITORING where you can monitor operation of the entire system, i.e. see controller input

and output, CO2 values, versions of connected modules, date and time, speed of fans, temperatures, pressure, etc. The amount of information

depends on the system conguration. This tool is designed for preventive maintenance of the system.

5.20. MODULE IDENTIFICATION

Three expansion modules can be connected to the main MCB board:

› EX1 module (module to control a heat recovery unit);

› EX2 module (power module with relays);

› Communications module.

Every module has its version, thus if it is connected instead of DISCONNECTED, a specic version number appears. Module states can be monitored

in the service or adjuster environment window MONITORING.

5.21. STAND-BY MODE BLOCKING

This function is designed to protect the system against the impermissible unit shutdown and it is recommended to limit the unit shutdown up to 1

hour within 12 hours during the winter season. Possible function modes:

› Always allow shutdown;

› Block shutdown;

› Block shutdown in winter;

› Block shutdown in summer.

It must be indicated for how long the shutdown is permissible within 12 hours. If it is blocked and the system is shut down, the system counts and

informs the user on the remaining time. This function is congured in the service environment (SERVICE › MAIN › SYSTEM BLOCKING).

If the time has expired and Stand-by mode is blocked, the user is informed by the function indication.

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5.22. AUTOMATIC CANCELLATION OF FAILURE WARNINGS

This function is intended for the automatic elimination of freezing-related breakdowns after a certain period of time. E.g., if the unit was shut down

due to critical frost protection conditions, then after some time the system can try operation again. The period is indicated in hours. If 0 is set, the

system waits until the user cancels the failures manually.

5.23. SUPPLY AIR TEMPERATURE CONTROL AND COMPENSATION

Temperature for supply air or premises temperature may be indicated. In the service environment section SERVICE › MAIN › SUPPLY AIR TEMPERA-

TURE CONTROL you can control it based on supply or exhaust air temperature. If control by premises temperature is selected, then it is calculated

what kind of air is to be supplied so that the proper room temperature is maintained. It is limited by allowable limits of supply air temperature.

The air handling unit is not designed to heat premises, therefore it is not necessary to use full capacity for low temperature di󰀨erences – the

compensation in percentage is provided for this purpose. This parameter indicates a percentage of the temperature di󰀨erence (between the set

temperature and premises temperature) to be compensated by this function. E.g. set point is 20 °C, temperature in the premises is 16 °C, compen-

sation is 50 %, di󰀨erence between the indicated and existing temperatures is 20-16=4 °C. Since 50 % is compensated, then 4*50 %=2 °C. When

the received value is added to the set temperature we get the required supply air temperature – 2+20=22 °C. This temperature is not limited as it is

within the supply air temperature protection limits. In this case the system maintains the supply air temperature at 22 °C. The closer the premises

temperature is to the set temperature (20 °C), the faster the supply air temperature reaches 20 °C.

It may be too hot in the premises, therefore this function both heats and cools. Preferred (compensated) temperature is displayed in the window

MONITORING (REQUIRED SUPPLY). If the displayed temperature is 0 °C, it means that temperature maintaining of supply air is switched o󰀨.

It is also possible to specify an integration factor that will gradually change the required supply air temperature without reaching the required ex-

tract air temperature. The higher the factor, the faster the required supply air temperature changes.

The temperature of supply air is maintained by the following components (indicated in a sequential order):

› Fans (operate slower, if it is too hot);

› Recirculation valve (if the ambient air temperature is favourable);

› Water cooler;

› DX cooler;

› Recirculation damper and CO2 (in case of favorable outdoor tem-

perature);

› Bypass damper or rotor (in case of favorable outdoor temperature);

› Recirculation damper and CO2 (in case of favorable outdoor tem-

perature);

› DX heater;

› Water heater;

› Water cooler/heater;

› Electrical heater;

› Fans (operate slower, if it is too cold).

First of all the system tries to maintain the supply air temperature by means of a heat exchanger. In case of a plate heat exchanger, the bypass

damper is controlled, and in case of a rotary heat exchanger, the rotor rotating speed or interval is changed. The heat exchanger can both heat

and cool – it depends on outdoor and room air temperatures. It is controlled by a PID controller whose coe󰀩cients are indicated in the adjuster

environment section ADJUSTER › PID CONTROLLERS ADJUSTING › HEAT EXCHANGER CONTROL BY SUPPLY AIR TEMPERATURE.

When the heat exchanger operates at full capacity and preferred temperature is not reached, the recirculation damper, then the heater or cooler

etc. is activated (if necessary). Only the components congured for temperature maintaining are activated. It takes 10 s for the system to switch

between the elements.

5.24. SUPPLY AIR TEMPERATURE LIMITS

In the service environment section SERVICE › MAIN › SUPPLY AIR TEMPERATURE LIMITS the minimum and maximum supply air temperatures are indi-

cated as well as permissible time and protection actions (no indication, indication of warning only, or unit shut-down). This function limits the supply

air temperature set by the user and other functions. If it is controlled by premises temperature, this function does not allow supplying warmer or

cooler air than that indicated in the protection.

If the system fails to maintain the right temperature, i.e. the supply air temperature is outside the protection limits for an indicated time period, the

unit is shut down (if indicated) and alarm is displayed. Based on manufacturer set parameters (by default), the minimum permissible supply air

temperature is 16,5 °C, and maximum – 40,0 °C.

5.25. CHANGING OF TEMPERATURE SETTINGS ACCORDING TO HEATING SEASON

This function is used to automatically change the temperature settings according to the season. As the heating season changes, the change from

heating to cooling is added to the temperature settings for all modes (building protection, economy, comfort) and subtracted when changing from

cooling to heating season.

The change can range from -15oC to +15oC. Addition or subtraction is limited by the permissible minimum and maximum supply air temperatures.

The default is 0C, so the temperature settings do not change with the heating season. Function settings in debugger environment in ADJUSTER ›

USER SETTINGS › WINTER/SUMMER › TEMPERATURE SETPOINT CORRECTION ON SEASON CHANGE.

5.26. THE SYSTEM MODE COMMUNICATION WITH EXTERNAL CONTACTOR

This function activates the preferred system switching on by means of external contactor; it indicates what signal will be sent to input. Possible

types of signals:

› Not used;

› Upon pressing a button the selected system mode is activated. After receipt of the rst impulse the function is activated, and after second

impulse – deactivated;

› ON/OFF; selected system mode is activated. The mode is active until the contactor is on;

› PIR sensor. When the sensor is activated, the selected system mode is activated. If the signal is not received for 30 minutes, the mode is

activated.

Function is set in the service environment section SERVICE › MAIN › SYSTEM MODE SWITCH.

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5.27. FAN SPEED DEPENDENCE ON EXTERNAL CONTACTOR

This function is designed to activate/deactivate the boost ventilation or preferred combination of fan speeds by means of an external contactor.

It is necessary to indicate a type of a signal to be sent to the input and what this function will control. Possible combinations of signal types and

functions:

› Not used;

› ON/OFF; selected fan speed combination is activated; the function is active until the contactor is on;

› Upon pressing a button the selected fan speed combination is activated; upon receipt of one impulse the function is activated, and after

second impulse – deactivated;

› ON/OFF. Boost ventilation function is controlled. It is active until the contactor is on. If this function is not shutdown, after expiry of time limit

a boost ventilation is terminated by force.

› Press a button. Boost ventilation function is controlled. After receipt of one impulse it is activated, and after second impulse – deactivated. If

this function is not terminated, after expiry of time limit a boost ventilation is terminated by force.

It is also indicated whether boost ventilation will be activated or a combination of fan speeds is preferred, i.e. it is possible to indicate individually

a preferred speed of the supply and exhausted air fans.

Function is set in the service environment section SERVICE › MAIN › FANS SPEED SWITCH.

5.27.1. FIREPLACE FUNCTION

The function of fan speed dependence on external contactor may help to light up the replace. The external contactor may be connected to its

door switch. It must be indicated that ON/OFF signal, the minimum exhausted air fan speed and the maximum supplied air fan speed is used. This

combination creates the pressure in premises, which improves the ue gas exhaust through a chimney and ame intensity. Upon opening the

replace door the function is activated and upon closing – deactivated.

Function is set in the service environment section SERVICE › MAIN › FANS SPEED SWITCH.

5.28. FILTER PROTECTION

5.28.1. FILTER TIMER SETTINGS

The lter timer limit is set in the service environment window SERVICE › MAIN › AIR FILTERS PROTECTIONS. The maximum setting is 1 year.

5.28.2. AIR FILTER PROTECTION BASED ON PRESSURE SWITCHES

Installed pressure switches can protect air lters against clogging. In the service environment window SERVICE › MAIN you can indicate their com-

binations:

› None;

› Supply air;

› Exhaust air;

› Supply and exhaust air.

When pressure switches are activated, the alarm is displayed.

5.29. FIRE PROTECTION FROM AN EXTERNAL CONTACTOR

Two re alarms – the main and the auxiliary – can be connected to this controller. According to default factory settings, the input of the master sig-

nal is normally closed (NC). Its conguration can be changed in the service environment in section SERVICE > DIGITAL INPUTS > EXTERNAL CONTROL

INPUTS. The response and the start time are indicated at the signal inputs, i.e. when the input will respond after opening voltage to the automation.

If the signal is interrupted, the protection is activated, a message is displayed and the system is operated in the specied mode. If both protections

are triggered, the function specied in the main input is performed. Protection is terminated upon canceling the warning. In the service environ-

ment section SERVICE › MAIN › FIRE PROTECTION a period of time when the system does not react and the mode of activated protection is indicated:

› Shut down the system;

› Run the supplied air fan at full speed and shut down the exhausted air fan;

› Run the exhausted air fan at full speed and shut down the supplied air fan;

› Run the supplied and exhausted air fan at full speed.

5.30. CO2REDUCTION FUNCTION

This function is designed to maintain a proper quality of room air. To activate it the exhaust air CO2 sensor must be connected and properly cong-

ured in the service environment window SERVICE › SENSORS. When completed, the exhaust air CO2 value is displayed in the section MONITORING.

In the service environment window SERVICE › MAIN › CO2REDUCTION FUNCTION you can switch on/o󰀨 the function, indicate preferred CO2 level and

allowable limit; when it is exceeded (CO2 set + allowable excess) CO2 is reduced, information is displayed and air-ow is increased. When CO2

reaches the set point, reduction is switched OFF.

CO2 protection is inactive in the stand-by and building protection modes.

5.31. CHANGING PASSWORDS

In the service environment section SERVICE › MAIN › PASSWORD › PASSWORD CHANGING MODE › ON you can change login passwords. For this it is

necessary to activate the change and after entering a preferred password (4 digits), click a button SET. To review and change the parameters

without a password, just set 0.

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5.32. RESTORING FACTORY DEFAULTS

If set parameters result in incorrect operation of the system, you can always restore the factory defaults in the service environment window SER-

VICE › MAIN › FACTORY SETTINGS.

5.33. FAN CONTROL

The preferred air-ow can be indicated in percentage or in 4 xed speeds where each of them is dedicated to a relevant system mode:

› Building protection;

› Economy;

› Comfort;

› Maximum power.

Fan speed can be controlled by:

› Percentage - speed in percentage is indicated in the adjuster environment window ADJUSTER › AIR FLOWS ADJUSTING: 0 % corresponds to 0,

and 100 % – 10 V control signal voltage;

› Pressure - the maximum system pressure is indicated, which based on speed settings in the adjuster environment ADJUSTER › AIR FLOWS

ADJUSTING means 100 % air-ow;

› Air-ow (m3/h) - K factors of supply and exhaust air and the maximum system air-ow (m3/h) are displayed, which based on speed settings

in the adjuster environment ADJUSTER › AIR FLOWS ADJUSTING means 100 %.

Fans based on air-ow and pressure are controlled by PID controller and its coe󰀩cients are indicated in the adjuster environment section ADJUST-

ER › PID CONTROLLERS ADJUSTING › FANS SPEED CONTROL BY AIR FLOW OR PRESSURE. Every fan is controlled individually.

In the service environment window SERVICE › FANS › FANS SPEED CONTROL you can limit the minimum and maximum fan control signal voltage.

Based on manufacturer set parameters, the minimum 2V voltage is indicated, which means that 0V voltage signal is sent when fans are o󰀨, and

2V voltage signal is immediately switched on when rotation is required.

It is possible to specify the nominal ows of supply and exhaust air. Then, the maximal air ow is calculated automatically.

5.33.1. FAN PROTECTION BY ROTATING SPEED

If fans have TACHO outputs, the fan failure can be identied by their rotating speed. If the system sends the signal to fans to rotate and they fail

to rotate, then the protection is activated, the system is shut down and alarm is displayed.

Function is switched on/o󰀨 in the service environment section SERVICE › FANS › FANS PROTECTION BY RPM.

If this protection is disabled, the same inputs are used for the warning signal, i.e. if the main fan failed and reserve fan is still working, then the

signal is transmitted to this input and warning is displayed about fan fault (system is not stopped).

5.33.2. AIR FLOW PROTECTION BASED ON PRESSURE

When this protection is activated the system must reach the required pressure or air-ow. If it does not happen within the indicated period of time,

the protection is activated, the unit is shut down and alarm is displayed. This may happen due to air ow/pressure gauge failures, pressure hose

defect, clogged ow, impeller defect, incorrect factor K, etc.

Function is switched on/o󰀨 and time is set in the service environment section SERVICE › FANS › AIR FLOW PROTECTIONS.

5.33.3. PROTECTION OF PREMISES WITH FIREPLACES

This protection is used for buildings with replaces. It protects against improper di󰀨erential air pressure, which can result in appearance of ue gas

(carbon black). A pressure switch must be connected to a dedicated digital input, which measures di󰀨erential pressure in premises and inside a

chimney. Upon activation of this protection, the unit is shut down by the activated pressure switch and warning is displayed.

Function is switched on/o󰀨 in the service environment section SERVICE › FANS › AIR FLOW PROTECTIONS.

5.33.4. SLOWING DOWN AIR-FLOWS BASED ON TEMPERATURE

If supply air temperature is more important than the air-ow, the slowing down function may be switched on. If full heating/cooling capacity is used,

but the preferred temperature is not reached, air-ow starts slowing down to reach the goal.

Function is switched on/o󰀨 in the service environment section SERVICE › FANS › AIR FLOW PROTECTIONS.

5.33.5. CONTINUOUS TEMPERATURE MAINTAINING BY SLOWING DOWN THE FANS

This function helps to save energy, when air-ow is changed. It is active, when the fans are controlled by percentage, since PID controllers do it

automatically when it is controlled based on air-ow or pressure. Fast change of air-ow imbalances the temperature maintaining function, thus

energy is wasted. If a user sets a higher air-ow, this function starts gradually increasing the air-ow and gradually slows down the speed of

change when it approaches the set value. This way the temperature maintaining function su󰀨ers less stress and consumes less energy. If the user

reduces the air-ow, the system switches o󰀨 the coolers and heaters to prevent from building up of heat/cold wave and gradually changes the

air-ow. Afterwards the heaters and coolers continue operating as required.

5.33.6. THE MINIMAL OUTDOOR AIR TEMPERATURE OF THE FREON COOLER/HEATER

The minimal fresh air temperature, at which the DX cooler/heater can operate, is indicated. If the fresh air temperature drops below the specied

limit, then the DX cooler/heater is shut down.

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5.33.7. EXHAUST AIR FAN CONTROL ACCORDING TO THE SUPPLY AIR FAN

This function can be activate in the column SERVICE › FANS. When this function is active, only the percentage/pressure/quantity of the supply air ow

are indicated. The exhaust air ow is controlled automatically by maintaining the nominal relation of the air ows. This function requires pressure

transducers, which measure the supply air and exhaust air ows. If MCB inputs are not su󰀩cient, it is possible to use the pressure converters

through Modbus communication line. The supply air fan can be controlled by percentage, according to the pressure or ow, while the exhaust air

fan is always controlled according to the ow.

5.34. CONTROL OF DAMPERS

The following can be connected to the system:

› supply air damper (ON/OFF, 3P, OPEN/CLOSE or Spring-return type). It is open to before starting the supply air fan and closed when it is

stopped;

› exhaust air damper (ON/OFF, 3P, OPEN/CLOSE or Spring-return type). It is opened before start-up of the exhaust air fan and closed when

it is stopped;

› recirculation dampers which are used to protect the heat exchanger from freezing, to maintain temperature and for complete recirculation

function;

› Fire dampers with one or two limit switches. They are controlled in the same way as supply/exhaust dampers, except for cases when testing

function is active or re protection is activated.

If ON/OFF, 3P or OPEN/CLOSE type damper is indicated, proper opening time must be indicated. ON/OFF type damper control:

› When it is necessary to open, OPEN signal is activated;

› It is necessary to wait until it opens and fans are started;

› OPEN signal is activated during the entire operation time;

› When shutting down the system, it is necessary to wait for 10 s, until the fans stop rotating and switch o󰀨 the OPEN signal.

3P type damper control:

› When it is necessary to open, OPEN signal is activated;

› Waiting until it opens, OPEN signal is switched o󰀨 and fans are started;

› OPEN and CLOSE signals are switched o󰀨 during the entire operation time;

› When shutting down the system, it is necessary to wait for 10 s, until the fans stop rotating and activate the CLOSE signal for an indicated

time period.

OPEN/CLOSE type damper control:

› When it is necessary to open, OPEN and CLOSE signals are activated;

› It is necessary to wait until it opens and fans are started;

› OPEN and CLOSE signals are activated during the entire operation time;

› When shutting down the system, it is necessary to wait for 10 s, until the fans stop rotating and switch o󰀨 the OPEN signal (CLOSE remains

active) for an indicated time period.

Spring-return type control (with a spring)

› When opening is required, the OPEN signal is activated;

› wait until it opens, and the fans are activated;

› OPEN signal is on full-time during operation;

› when the system is being stopped, wait for 10 seconds until the fans stop, and the OPEN signal is deactivated, the dampers close immedi-

ately.

5.34.1. RECIRCULATION BASED ON SUPPLY AIR TEMPERATURE

This function is designed to maintain the supply air temperature by reducing the volume of unfavorable fresh (outdoor) air. Additionally it is recom-

mended to use CO2 sensor for the premises air, whereas upon increase of CO2 the closing level of recirculation damper would be limited.

Temperature maintaining is controlled only when the heat exchanger operates at full capacity.

Function is switched on/o󰀨 in the SERVICE › DAMPERS window RECIRCULATION BY SUPPLY. It is necessary to indicate PID coe󰀩cients in the window

ADJUSTER › PID CONTROLLERS ADJUSTING.

5.34.2. FULL RECIRCULATION FUNCTION

This function is designed to save consumption of heating energy, by recirculating only the premises air. It is used only when fresh air is not nec-

essary. During operation of recirculation damper control and ECONOMY and BUILDING PROTECTION modes, there is a possibility to switch on a full

recirculation function.

During this time the recirculation damper is opened and outdoor air damper is closed, exhausted air fan is shut down and the heater maintains

the indicated supply air temperature.

5.34.3. OUTDOOR AND SUPPLY AIR RECIRCULATION DAMPERS

If only recirculation damper of supplied air is activated, then it alone shall perform all recirculation functions. If both (outdoor and supply air) recir-

culation dampers are activated, then their functionality shall be distributed as follows:

The supply air recirculation dampers shall perform the following:

› Full recirculation function;

› Supply air temperature control;

› Shut down of exhausted air fan, when recirculation takes more than 80 %;

› CO2 reduction is performed by both dampers.

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The outdoor air recirculation dampers shall perform the following:

› Heat-exchanger deicing function;

› In stand-by mode full recirculation (blocking of outdoor air).

The supply and outdoor air recirculation dampers shall perform the CO2 reduction function.

If the outdoor air recirculation damper is activated, then it is necessary to assign 0-10VDC output for its control.

outdoor air supply air

extract air exhaust air

outdoor air recirculation supply air recirculation

5.34.4. TESTING OF FIRE DAMPERS

Fire dampers may be tested manually or automatically at indicated day intervals. Testing results are stored in event history. If testing fails, a warn-

ing is displayed. The user can indicate the damper testing hour (in user settings) as air-ow is then stopped. The necessary position in case of re

is also indicated in the service environment.

The dampers are always monitored by the limit switches for the correct position. If not, the system is stopped and the damper fault is registered.

Response times are specied in the service environment as valves may sometimes be tested externally. Closing the dampers stops the ow of air.

Dampers are congured in the service environment window SERVICE › DAMPERS.

5.35. HEAT EXCHANGER CONTROL

5.35.1. COLD-HEAT RECOVERY

Cold-heat recovery function is designed to control a heat exchanger. Its power is controlled by:

› Using plate heat exchanger - bypass damper. When it is closed, the heat exchanger is operating at full capacity. Its power is reduced by

opening the damper.

› Rotary heat exchanger power is controlled by changing its rotating speed or interval. When the rotor rotates at full speed, the heat exchanger

is used at full capacity. The power is reduced by slowing down the rotating speed or increasing the interval. The heat exchanger can both heat

and cool – it depends on air temperature. If it is colder outside than in the premises, the heat exchanger pre-heats the outdoor air by using

the room heat. If it is colder in the premises than outside, the heat exchanger cools down the outdoor air temperature by room air. Its power is

reduced to the minimum when the target supply air temperature is the same as outdoor one. The higher the di󰀨erence between the preferred

and supply air temperatures, the higher heat exchanger power is used. When it is operating at maximum capacity, it is allowed to activate

other heating/cooling components.

For this function suitable heat exchanger type is indicated in the window SERVICE › HEAT EXCHANGER and PID controller coe󰀩cients – in the window

ADJUSTER › PID CONTROLLERS ADJUSTING.

PID controller output limits are set for rotor or bypass damper, at which their operation starts.

› If rotor is controlled by 0..10 V signal, at low voltages it does not rotate, the motor heats up, thus the minimum control signal output is limited.

If On/O󰀨 rotary heat exchanger is used, PID percentage for activating the rotor is indicated in the window SERVICE › HEAT EXCHANGER.

› If the bypass damper opens only a few percent, noise can occur, thus the minimum its opening limit is limited, which also applies when com-

ing to the full opening. If the plate heat exchanger with a 3-way bypass damper is used, the opening time of the bypass damper is indicated

in the window SERVICE › HEAT EXCHANGER.

› If a plate heat exchanger with segment valves is controlled by an external controller is used, then the type of the bypass damper REMOTE

CONTROLLER is shown in the window SERVICE › HEAT EXCHANGER.

› If a plate heat exchanger with segment valves connected to a controller is used, then the type of the bypass damper is shown in the window

SERVICE › HEAT EXCHANGER as either 2 SEGMENTS or 3 SEGMENTS. In the case of heat recovery control, segments are closed in sequence, i.e.

if heat recovery is not required, then all the segments are closed and the bypass damper is opened.

When the fans are switched on during the heating season, the heat exchanger runs for 10 minutes at full power, until the system stabilizes.

5.35.2. HEAT EXCHANGER FROST PROTECTION

This protection is designed to protect the heat exchanger from the formation of ice inside because ice formations can damage the structure of the

heat exchanger. The protection is congured in the service environment, in the window SERVICE › HEAT EXCHANGER.

The protection can be activated/deactivated according to the following:

› Specied outdoor air temperature;

› Specied exhaust air temperature;

EN | 15MCB_miniMCB v2019.1

› Specied exhaust air temperature di󰀨erence compared to the calculated freezing temperature (this temperature is calculated according to

the outdoor air temperature, room air temperature and humidity);

› According to the pressure switch.

Possible protection measures (to be carried out one by one as specied):

› Recirculation of outdoor and exhaust air;

› Opening of the bypass damper or control of the segment valve, or slowing-down of the rotor;

› Heating of outdoor air using a preheater;

› Suspension of the supply air ow or reduction of the ow based on the set exhaust air temperature;

› Shutting-down of the unit according to the low supply air temperature (by default, the limit is 5 °C);

› Shutting-down of the unit if there are no protection measures activated (shut-down after 5 minutes);

› Shutting-down of the unit due to failure to reach the safe zone corresponding time interval (two cycles, by default, 60 minutes);

› Shutting-down of the unit according to the critical outdoor air temperature (to be shut down after 60 seconds).

The protection activation conditions and protection measures can be activate selectively. The protections are active only when the outdoor air

temperature drops below the set limit, i.e. the protections will respond to the pressure switch only when the outdoor air temperature drops below

the permissible limit. For the anti-frost protection, the time interval after which the system switches from one protection measure to another is

also specied (by default, it is 30 minutes). If at least one of the activation conditions is satised, the protection becomes active and a message

is shown. The initial protection is recirculation, which is followed by the bypass damper or segment valve, then preheater and then, if the power is

not su󰀩cient, the supply air ow is suspended. If the protection does not help within the specied time interval (by default, 30 minutes), the system

switches to the following one. The protections are switched from one to another in accordance with the sequence.

The recirculation of outdoor and exhaust air is an e󰀨ective and cost-saving protection but it supplies exhaust air back to the supply air ow.

When using the bypass damper or segment valves, the supply air heater must be connected. By slightly opening the damper, the cold air ow

through the heat exchanger is reduced but supply air is cooled and must be heated using the supply air heater. This protection slowly opens the

bypass damper as long as the activation conditions are satised. When suitable conditions are reached, the damper is stopped for 5 minutes and

then it is slowly closed. If the outdoor air temperature drops below the permissible level (the heating power is not su󰀩cient), then the damper is

forcedly closed according to the supply air temperature.

The bypass valve can also be with segment valves. In this case, the supply air temperature drops less than when using only the bypass damper.

At the time of deicing, segments are closed one by one in sequence, i.e. only one segment can be closed at a time and the bypass damper is

opened. If at least one segment is closed, then the bypass damper is opened; if all the segments are opened, then the bypass damper is closed.

For the protection with the preheater, the position of the outdoor air sensor in respect of the preheater is specied (upstream/downstream). If the

sensor is upstream the preheater, then the unit is not shut down if the required outdoor air temperature is not reached. At the beginning, the out-

door air preheater is activated to the full capacity for a certain period of time, and that it begins maintaining the specied deactivation temperature

(outdoor or exhaust air temperature).

If the preheater capacity is not su󰀩cient and the supply air ow reduction is permitted, then the supply air fan is periodically shut down and the

heat exchanger is deiced by heating it with exhaust air. When the fan stops, the supply air damper is closed.

Recirculation, the bypass damper and supply air ow suspension operate in periodic cycles. The minimum deicing time is 5 minutes, and the

minimum time interval between deicing cycles changes depending on the outdoor air temperature (see the diagram), i.e. the lower the outdoor air

temperature is, the shorter the time interval between deicing cycles. The exhaust air temperature and the pressure switch of the heat exchanger

can extend time intervals between deicing cycles and to extend the deicing time, i.e. if the minimum time interval after a deicing cycle has elapsed

and the pressure valve has not yet been activated, then its activation is awaited; otherwise, if the required conditions are not achieved within

5 minutes during deicing (the pressure valve does not reset or the exhaust air temperature does not increase), then deicing is extended. If the

protections according to the pressure switch and/or according to the exhaust air temperature are not activated, then deicing cycles take place at

minimum intervals.

The dependence of the minimum time interval between deicing cycles (minutes) on the outdoor air temperature.

35 min. 30 min. 25 min. 20 min. 15 min. 10 min. 5 min. min.

-2 oC

-4 oC

-6 oC

-8 oC

-10oC

-12 oC

-14 oC

-16 oC

-18 oC

-20

5.35.3. PROTECTION FROM TO HIGH CONDENSATE LEVEL

If there’s too much condensate, the condensate pump transmit signal to MCB board. The user receives warning immediately. If the signal is active

for more than 60 min, airow will be reduced till minimum. The protection will be disabled automatically after the signal discontinues.

5.35.4. INDICATION OF BYPASS DAMPER FAULT

This function is intended to monitor the operation of the bypass damper (operated by a stepper motor) and only starts functioning after successful

calibration.

The closed damper must necessarily push the end position switch, which must disconnect when it opens by more than 25 %. When the damper

is not operating correctly, a fault message is displayed.

16 | EN MCB_miniMCB v2019.1

5.36. HEATERS

5.36.1. SUPPLY AIR HEATER

The heater additionally pre-heats the supply air when the heat exchanger power is insu󰀩cient. It is controlled by means of a PID controller based

on the temperature indicated in the system and based on data of the supply air temperature sensor. One supplied air heater can be connected

to this system. It may be either electric or water heater. PID controller coe󰀩cients are set in the adjuster environment window ADJUSTER › PID

CONTROLLERS ADJUSTING.

Possible options of supplied air heaters in this system:

› Supplied air heater is not used;

› Electric heater is controlled by 0..10VDC signal;

› Electric heater is controlled by On/O󰀨 signal. PWM control interval in seconds is set to control it;

› Water heater.

Types of heaters are indicated in the service environment window SERVICE › HEATERS. Also it is possible to swap connection of the pre-heater and

heater protections and control signals.

5.36.2. ELECTRIC HEATER OVERHEAT PROTECTION

The electrical heater can have two protections: automatic and manual. The automatic protection automatically deactivates when the heaterhas

cooled down, and the manual protection should be deactivated by pressing the switch on the heater.

The automatic protection is checked at all times, while the manual protection is checked only when the heater is activated.

When the automatic protection is activated, the heater and its power circuit are disconnected, a message is shown and cooling is ensured by an

increased air ow. The automatic protection is eliminated automatically. The fan speed is controlled according to the supply air temperature, i.e.

if the supply air temperature drops below the minimum, the fan speed is reduced. When the manual protection is activated, the heater and its

power circuit are disconnected, a warning is shown and the indicated action is performed. According to the factory settings, blowing is carried out

a the full capacity in order to ensure the maximum cooling of the heater because there is a probability that the manual protection may be blocked

and leave it operating. Certainly, if it is activated properly, when blowing at the full capacity in winter, the supply air temperature falls rapidly to the

critical level and the system is shut down in any case.

The protection is congured in the window SERVICE › HEATERS of the service environment.

5.36.3. COOLING OF ELECTRIC HEATERS

If the used electric heater and the system wants to shut down the fan, the heaters are switched o󰀨 and they are cooled down by blowing for an

indicated time period. A user is notied of heater cooling. Time is indicated in the service environment section SERVICE › HEATERS › ELECTRICAL

HEATERS COOLING. The fan speed is controlled according to the supply air temperature.

5.36.4. WATER HEATER FROST PROTECTION

The protection is always active, because the heater uncontrolled by this automation can be switched on in the supply air duct. The minimum al-

lowable supply air and return water temperature is indicated. If any of them drops below the indicated temperature or the thermostat is activated,

the unit is shut down and warning is displayed. The heating drive opens 100%.

This function also protects the heater against cold air when starting up the system in winter. Prior to switching on the fans the heater is allowed to

operate for the indicated time period at 100 %.

Always in winter (even in Stand-by mode) the minimum 20 °C return water temperature is maintained, moreover the circulation pump is always

rotating and the damper is not fully closed (stays ajar at least 5 %).

Protection is congured in the service environment section SERVICE › HEATERS › HYDRONIC HEATERS PROTECTION.

5.36.5. PROTECTION OF WATER HEATER CIRCULATION PUMPS

Circulation pumps of the water heater and pre-heater must be always on during the entire winter. In summer they are switched on for 30 minutes

for preventive check at indicated time intervals.

Circulation pump signals are also monitored. If a failure is reported, the circulation pump is switched o󰀨. The fault is cancelled manually. You can

specify whether to stop ventilation or only to display the message.

Protection is congured in the service environment section SERVICE › HEATERS › HYDRONIC HEATERS PROTECTION.

5.36.6. OUTDOOR AIR PRE-HEATER

Outdoor pre-heaters are controlled based on frost protection. The water pre-heater, as the same type heater, is pre-heated before system start-

up. In winter the circulation pumps are always rotating, and in summer they are switched on for 5 minutes for preventive check at indicated time

intervals.

Possible options of outdoor heaters:

› Supply air pre-heater is not used;

› Electric pre-heater is controlled by 0..10 VDC signal;

› Electric pre-heater is controlled by ON/OFF signal. PWM control interval in seconds is set to control it;

› Water pre-heater.

Types of pre-heaters are indicated in the service environment window SERVICE › HEATERS.

EN | 17MCB_miniMCB v2019.1

5.36.7. OUTDOOR AIR WATER PRE-HEATER FROST PROTECTION

The minimum allowable return liquid temperature is indicated. If it drops below the indicated temperature, the unit is shut down and warning is

displayed. The most common liquid is glycol, therefore the protection must be set according to its parameters.

This protection also protects the pre-heater against cold air when starting up the system. If this unit is switched o󰀨 in winter, it is automatically

pre-heated prior to starting up the fans, i.e. it is allowed to operate for the indicated time period at 100 %.

Protection is congured in the service environment window SERVICE › HEATERS.

5.37. COOLERS

In this system, when the heat exchanger cooling power is not su󰀩cient, a water or freon cooler may be used. They help to reduce the supply air

temperature.

Indicates the water cooler water freezing point. Also freon cooler control type (ON/OFF or 0..10 V), the minimum time between ON/OFF, possibility

to switch to heating mode is set. In this case the deicing time is set.

Coolers are congured in the window SERVICE › COOLERS.

5.37.1. WATER COOLER

The water cooler can be used both as a cooler and a heater; therefore, it is necessary to specify whether the cooler is used only for cooling or for

cooling and heating.

The heating mode can be activated as follows:

› According to the heating season (according to the 3-day outdoor air temperature or the date)

› According to the return water temperature (limit: 20°C)

› According to the digital signal (external contact)

In the heating mode, the cooler operates according to the algorithms of the water heater.

5.37.2. FREON COOLER

For the freon cooler, the following is indicated: the control type (ON/OFF or 0..10 V), minimum interval between activation and deactivation, minimum

outdoor air temperature, and the possibility to switch into the heating mode. If the possibility to switch to the heating mode is activated, then the

deicing time is indicated.

If the freon cooling control is indicated as 0..10 V and the heating mode is active, then the automatics respond to the deicing status of the external

controller (transmitted through the Modbus communications line). If deicing is in progress, then the exhaust air fan is slowed down, the air heater

is activated at full capacity. After deicing, the exhaust air ow is increased and water drops are blown away.

The conguration of coolers in the window SERVICE › COOLERS.

5.37.3. THE MINIMAL OUTDOOR AIR TEMPERATURE OF THE FREON COOLER/HEATER

The minimal fresh air temperature, at which the DX cooler/heater can operate, is indicated. If the fresh air temperature drops below the specied

limit, then the DX cooler/heater is shut down.

5.37.4. THE FREON COOLER/HEATER AIR FLOW PROTECTION

The minimal supply air ow, at which the DX cooler/heater can operate, is indicated. If the supply air ow drops below the specied limit for more

than 60 s, then the DX cooler/heater is shut down and a warning message is shown.

Also, the maximal speed change of the supply air fan (in percentage points per second) is indicated when the DX cooler/heater operates. If the

DX cooler/heater operates, then the rapid switching of the supply air fan from one speed to another is restricted.

5.37.5. AUTOMATIC ADJUSTMENT OF DEFROST INTERVALS OF THE FREON COOLER/HEATER

This function is designed to automatically adjust the defrost intervals (using external controller) by monitoring the time of this process. Modbus

communicates the dynamic time interval settings from the MCB to the heat pump controller.

This function species the required initial interval between defrosting and the defrosting time (e.g. 3 min.). After defrosting, the automatics com-

pares how long this process lasted. If it lasts longer than specied, the time between defrosting is reduced by 5 minutes, and if shorter, then

extended by 5 minutes.

Maximum time between defrosting – 360 min.

5.38. DIGITAL INPUT CONFIGURATION

In this system you can set a normal state of every digital input, i.e. indicate whether the contactor is normally open or closed (NORMALLY OPEN (NO),

NORMALLY CLOSED (NC)). The re protection contactor must be NC as in case of re the contactor may break due to burnt cable.

Digital inputs are congured in the service environment window SERVICE › DIGITAL INPUTS.

5.39. SENSOR CONFIGURATION

In this system, three 0-10V DC sensors and eight temperature sensors can be used. The following can be connected to two 0-10 VDC inputs:

› supply air RH sensor;

› exhaust air CO2 sensor;

18 | EN MCB_miniMCB v2019.1

› exhaust air RH sensor;

› supply air pressure switch;

› exhaust air pressure switch;

› an additional supply air pressure sensor is designed to measure air ow when the exhaust air fan is controlled by the supply air fan ow;

› an additional exhaust air pressure sensor is designed to measure air ow when the exhaust air fan is controlled by the supply air fan ow.

If pressure switches for more than 3000 Pa are being used, it’s necessary to change pressure scale at SERVICE › SENSORS › AIR PRESSURE FACTOR

to 1.

The pressure sensor of the heat exchanger can be connected to the third 0-10 VDC input.

For each input, the sensor voltage interval (0-10 V, 1-10 V, 0-5 V, 0.6-2.7 V, 0-3.3 V) and the minimum and maximum values are indicated for each

input.

Types of temperature sensors:

› NONE – sensor is not connected;

› REMOTE – remote; sensor temperature can be indicated via Modbus;

› NTC 10K 3977 – NTC sensor is connected.

› NTC SENSOR with a non-standard beta (2750 – 5000). After changing the beta coe󰀩cient, it is necessary to save and restart.

In this system every type of sensors and possible actions in case of failure are indicated.

› Do nothing – only warning is displayed;

› Shut down the system – system is stopped, alarm is displayed;

› Emergency mode – operation is continued, but sensor-dependent functions are switched o󰀨, warning is displayed.

Sensors are congured in the service environment window SERVICE › SENSORS.

5.39.1. SENSORS ADJUSTING

In this system, the linear adjustment of the sensors is possible, i.e. the indications of each sensor can be adjusted through +/- 100.0 °C, %, Pa,

and ppm.

The adjustment of the sensors is performed in the adjuster environment, in the window ADJUSTER › SENSORS ADJUSTING.

5.39.2. MODBUS SENSORS

The list of Modbus sensors that can be connected to MCB board via MB-Gateway:

› Supply air temperature;

› Extract air temperature;

› Exhaust air temperature;

› Outdoor air temperature;

› Water temperature for water heater;

› Water temperature for water preheater;

› Water temperature for water cooler;

› Control board temperature;

› Extract air RH;

› Supply air RH;

› Extract air CO2;

› Supply air CO2;

› Extract air pressure;

› Supply air pressure;

› Extract air lter air pressure;

› Supply air lter air pressure;

› Heat exchanger air pressure;

› DX cooler/heater coil pressure.

› Supply air ow pressure sensor 2;

› Exhaust air ow pressure sensor 2.

› An additional supply air pressure sensor is designed to measure air

ow when the exhaust air fan is controlled by the supply air fan ow.

› An additional exhaust air pressure sensor is designed to measure air

ow when the exhaust air fan is controlled by the supply air fan ow.

If pressure switches for more than 3000 Pa are being used, it’s necessary to change pressure scale at SERVICE › SENSORS › AIR PRESSURE FACTOR

to 1.

5.39.3. PRESSURE LIMITS TO EACH MODE

Various activation limits can be set for each airow (1, 2, 3, 4) by using Modbus pressure switches for lters, heat exchanger or DX cooler/heater

coil. The limits can be set manually or automatically, i.e. by activating calibration function.

The overrun limits are also specied for each sensor.

5.40. COMMUNICATIONS LINE CONFIGURATION

MCB controller has two independent communications lines. One of the lines is dedicated to remote control panels, another one – to BMS network.

The latter is galvanically insulated. Communication protocol – Modbus RTU.

Based on manufacturer set parameters

› Modbus address – 1;

› Communications Line speed – 19200;

› Data package structure – E,8,1 (communications line parity: even).

Communications lines are congured in the service environment window SERVICE › COMMUNICATION.

5.41. CONFIGURATION OF MODULES

In the section SERVICE › COMMUNICATION › INTERNAL COMMUNICATION you can indicate what modules must be connected to the main board. If this

EN | 19MCB_miniMCB v2019.1

is not done, but anyway they are connected, the setting is not shown automatically. If the module is indicated, but not connected, the system is

shut down and error warning is displayed.

5.42. COOKING HOOD FAILURE INDICATION

When cooking hood is used which controls the unit by Modbus communication, the failure indication displaying can be switched on/o󰀨 therein.

When the warning is switched o󰀨, it is recommended to connect a remote control panel to the system, where failure indications are displayed.

Function is switched on/o󰀨 in the section SERVICE › MAIN › COOKING HOOD.

5.43. CONTROLLER BOX TEMPERATURE MAINTAINING

This function helps to control the temperature of controller box by heater or fan. Temperature is maintained by means of integrated (in EX1 module)

sensor. Preferred temperature and control principle is indicated – by heater or fan.

Function is set in the section SERVICE › MAIN › CONTROLLER CABINET.

5.44. LOG-IN SESSIONS ARE LIMITED BY A TIME INTERVAL

This function terminates a service and adjuster session every 60 minutes. If a service worker or adjuster forget to log out from the service or ad-

juster environment, then the controller will automatically lock the environments with passwords after 60 minutes.

6. CONNECTION OF BOARD DIAGRAM AND PERIPHERALS

6.1. MINI MCB BOARD PINOUT DESTINATION

miniMCB

CONEC-

TION

NO.

CON-

TACT

NO.

FUSE

NO.

MAX

CURRENT,

LED

NO.

CONTACT NAME FUNCTIONAL UNIT TITLE OPERATION IN

STAND-BY MODE

(1W)

- - -

Rotor speed RPM -

2 GND

3 24VDC

4 DI1 (HOLO)

- - -

GND Supply air fan control output (0-

10VDC) -

2 AO1 (0-10V)

3 GND Extract air fan control output (0-

10VDC) -

4 AO2 (0-10V)

5 GND Outdoor air preheater control output

(0-10VDC) -

6 AO3 (0-10V)

- - -

24VDC_P

Bypass step motor control -

2 STEP_B/

3 STEP_B

4 STEP_A/

5 STEP_A

6 24VDC_P

- - -

DI2 (TACHO1_A) Supply fan speed (RPM) -

2 (TACHO1_K)

3 DI3 (TACHO2_A) Extract fan speed (RPM) -

4 (TACHO2_K)

5 DI4 Fire protection input (NC) +

6 3.3V_1W

- - -

DI5 Outdoor air electrical preheater

automatic protection (NC)/

Water preheater circulation pump fail

2 12VDC

3 DI6 Outdoor air electrical preheater man-

ual protection (NC) -

4 12VDC

5 DI7 Bypass closed input (NO) -

6 12VDC

7 DI8 Heat exchanger pressure relay (NO) -

8 12VDC

20 | EN MCB_miniMCB v2019.1

- -

AI1 (NTC) T1-Supply air temperature sensor -

2 GND

3 AI2 (NTC) T4-Fresh air temperature sensor -

4 GND

5 AI3 (NTC) T2-Extract air temperature sensor -

6 GND

7 AI4 (NTC) T3-Exhaust air temperature sensor -

8 GND

- - -

DI9 System mode switch +

2 3.3V_1W

3 DI10 Custom fans speed switch +

4 3.3V_1W

5 AI5 (0-10V) A2-Supply RH or extract CO2/RH/

pressure sensor input -

6 GND

7 24VDC 24VDC Power supply for Air quality

sensor 2 -

8 GND

- - -

GND

EX1 module power, control -

2 24VDC_P

3 12VDC

4 3.3VDC

5 2.5VDC_REF

6 GND

7 I2C_SDA

8 I2C_SCL

- - -

24VDC POWER

24VDC power supply input -2 GND

3 PE

X10

- - LED12

PE Heater power line/circulation pump

(max.0,6kW) -2 DO1 (L(L2)_2)

3 N(L1)_2

X11

- - -

N(L1)_2 230VAC Power supply for X10 and

X12 -2 L(L2)_2

3 PE

X12

- - LED13

Preheater power line (max. 2kW) -2 N(L1)_2

3 DO2 (L(L2)_2)

X13

- -

-PE Extract air damper control output

DO3 (Open) DO4 (Close) 0,5A (Pos-

sible to control Supply, but without

defrost protection)

2 N(L1)

3 LED9 DO3 (L(L2))

4 LED10 DO4 (L(L2))

X14

LED8

DO5 (L(L2)) Rotor control output (max. 0,5A)/

Supply air damper control (enabled

using I/O map)

-2 N(L1)

3 PE

X15

- - LED11

PE Supply fans power line (PV vent.

Max 2,5 A) -2 N(L1)

3 DO6 (L(L2))

X16

- - LED11

DO6 (L(L2)) Extract fans power line (IV vent. Max

2,5 A) -

2 N(L1)

3 PE

X17

- - -

L(L2) 230VAC Power supply for X13, X14,

X15, X16 -2 N(L1)

3 PE

X18

- - -

RS422/485 communication port +

2 -

3 -

4 RS422/485_A

5 RS422/485_B

6 GND

7 24VDC

8 GND

F1 1 - - MCB 24VDC protection fuse -

LED1 3.3V MCB power indication (1W

mode) +

LED2 12V MCB power indication -

LED3 3.3V MCB power indication (ON

mode) -

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