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5.15 Mixing Box management

A mixing box (3-damper arrangement) can be used to modulate the air recirculation from extract to supply duct.

Commands

5.15.1 ON/OFF recirculation

This mode uses the logic defined as recirculation damper.

5.15.2 Modulated recirculation as heating/cooling capacity

In this mode the signal for heat recovery system is split between HR command and mix command:

Then the mixing section is enabled only when primary heat recovery system is fully loaded.

5.15.3 Minimum fresh air threshold

The mix command can be clamped by the minimum fresh air threshold value.

For example, if

minfreshair

= 20%, then the maximum allowed value for mix command is (100% - 20%) = 80 %.

The primary heat recovery system shall be turned off when the recirculation is 100%.

Output command

Recirculation
(Analog)

Outdoor
(Analog)

Exhaust
(Digital)

INDOOR

OUTDOOR

100%

50%

100%

Mix
command

100%

50%

100%

Mix
command

Recirculation Damper (CD07)

Outdoor Damper (CD11)

Output command

100%

50%

Mix
command

Exhaust Damper (CD15)

Output command

Open

100%

50%

100%

Heat Recovery Demand

HR command

100%

50%

100%

Mix command

Heat Recovery Demand

Minimum fresh air threshold

Содержание HHFlex C

Страница 1: ...1177fil HHFlex C R P S AHU Control Operating Instructions V8 00 ...

Страница 2: ...al display 11 3 6 Web panel 11 3 7 Connection to the unit 11 3 8 Login Screen 12 3 9 Overview Screen 13 3 10 Dashboard screen 13 3 11 Actual Setpoint screen 14 3 12 Alarm Status screen 14 3 13 Inputs Output screen 14 3 14 Analog Inputs screen 15 3 15 Analog Outputs screen 15 3 16 Digital Inputs screen 16 3 17 Digital Outputs screen 16 3 18 Time Program screen 17 3 19 Settings screen 18 3 20 Factor...

Страница 3: ...Warm Up at Unit Start Up 26 5 5 Unit Frost Protection 26 5 6 Chilled water Cooling Coil 26 5 6 1 Temperature Control 26 5 8 Change over water Coil for Heating and Cooling 27 5 8 1 Heat Cool Thermostat TS01 27 5 8 2 Temperature Control 27 5 8 3 Water Coil Frost Protection TA05 27 5 8 5 Warm Up at Unit Start Up 28 5 8 6 Unit Frost Protection 28 5 8 7 Defrost of heat pump 28 5 8 8 Backup electric hea...

Страница 4: ... 36 5 21 2 Default settings for relative humidity control 37 5 23 Dehumidification control 38 5 23 1 Description control algorithm 38 5 23 2 Default settings for relative humidity control 38 6 DIAGNOSTICS TROUBLESHOOTING 39 6 1 General 39 6 2 Displaying Alarms 39 6 2 1 E DSP External display unit 39 6 2 2 Web Panel 39 6 3 Alarm report 39 6 4 Resetting Alarms 39 6 5 Alarms List 40 7 BUS COMMUNICATI...

Страница 5: ...supplied separately must be read understood and followed Apply all standard safety codes and practices Wear safety glasses and gloves Use the proper tools to move heavy objects Move units carefully and set them down gently 1 2 Avoid Electrocution Only personnel qualified in accordance with IEC International electro technical Commission recommendations may be permitted access to electrical componen...

Страница 6: ...t unit from restarting 2 3 Battery The resources and the program are stored in RAM To ensure that they are not lost and that the hardware clock continues to run when there is a power failure the controller is equipped with a buffer battery The buffer time is at least 5 years The buffer battery is a 3V lithium battery CR2032 The battery voltage is monitored When battery is low the P B Indication LE...

Страница 7: ...7 2 5 Mapping of Inputs Outputs ...

Страница 8: ...ith automatic detection change over TCP EXOline TCP BACnet IP Modbus IP requires EXOreal 3 1 1 01 or later Modbus 8 bits 1 or 2 stop bits Odd even Fs or no parity Speed Port 1 and Port 2 adjustable 1200 38400 bps 2 6 3Casing Protection class IP20 Mounting DIN rail mounting or mounting in cabinet Plastic Polycarbonate PC 2 6 4Inputs Analogue inputs AI 0 4 20 mA 0 10 V 0 200 mV PT 1000 DIN Ni1000 LG...

Страница 9: ... There are one or more unacknowledged alarm s Flashing red There are one or more remaining acknowledged alarm s Fixed red You are in a dialogue box where it is possible to switch to change mode Flashing yellow Change mode Fixed yellow 3 3 Log in The standard passwords are 3333 for basic level with the lowest access guest and 2222 for level giving more access operator Menu tree external display ...

Страница 10: ...NTROLLER SLAVE 2 CONTROLLER TIME SCHEDULE RUN SCHEDULE LOW SPEED NIGHTCOOLING RECIRCULATION PUMPTEST HOLIDAYS SETTINGS PRESSURE FAILURE SUPPLY TEMPERATURE FILTER SENSOR SUPPLY EXHAUST END LOW HIGH SUPPLY FAN EXTRACT FAN FACTORY INPUTS OUTPUTS RUNTIME ADJUST TIME DATE COMMUNICATION DEFAULTSCREEN SOFTWARE VERSION TYPE AND SERIAL NR MODBUS CONFIG BACNET IP CONFIG MANUAL AUTO ACCES RIGHTS MAIN CONTROL...

Страница 11: ...ntroller is working in service IP address mode when Digital Input DI7 of the main controller is closed connect 24VDC to DI7 and is working in user IP address mode when DI7 is open The default service IP and user IP address of the unit is 169 254 24 1 The user IP address can be changed in the Settings menu when operating in service IP address mode or with the E DSP under Service Communication The s...

Страница 12: ...Klick on the login button There are three login levels Basic level with the lowest access Login Guest Password 1111 Level giving more access Login Operator Password 2222 Level with full access for manufactory purpose only ...

Страница 13: ...r No settings can be made 3 10 Dashboard screen Displays relevant modes and actual values All values written in blue can be changed As soon as a value has been changed and you have pressed enter the value is downloaded to the HHFlex controller Users logged in as Operator can make changes on this pages ...

Страница 14: ...lex controller Users logged in as Guest can make changes on this pages 3 12 Alarm Status screen Shows actual Alarms and Status of the unit Alarms can acknowledged blocked or unblocked Users logged in as Guest or Operator can make changes BE CAREFUL Blocking Alarm can lead to unsafe situations 3 13 Inputs Output screen Shows actual values for all inputs and outputs This is a read only folder No set...

Страница 15: ... frost protection max temperature electric heater and minimum airflow electric heater will be ignored 3 15 Analog Outputs screen Shows actual values for all analog outputs For testing purpose only all functions can manually set here to a certain value Only users logged in as Operator can make changes BE CAREFUL All settings which are made here will be executed Protections like frost protection max...

Страница 16: ... frost protection max temperature electric heater and minimum airflow electric heater will be ignored 3 17 Digital Outputs screen Shows actual values for all digital outputs For testing purpose only all functions can manually set here to a certain value Only users logged in as Operator can make changes BE CAREFUL All settings which are made here will be executed Protections like frost protection m...

Страница 17: ...ght cooling schedule Recirculation schedule Pump test schedule Holiday program All values written in blue can be changed by users logged in as Guest or Operator As soon as a value has been changed and you have pressed enter the value is downloaded to the HHFlex controller The day begins at 00 00 hours and ends at 24 00 hours ...

Страница 18: ... a value has been changed and you have pressed enter the value is downloaded to the HHFlex controller Only users logged in as Operator can make changes BE CAREFUL Bad PID parameters can lead to unstable control 3 20 Factory Screen For manufactory purpose only data can be read but changed only by manufactory ...

Страница 19: ...e TT02 control To activate this function select supply air temp in the configuration menu If OAT correction is selected there is compensation on the supply air temperature according the graph 4 2 Economy mode based on OAT TT06 If the option Eco mode on Outdoor Temp is selected in the configuration menu Actual Setpoint then mechanical heating cooling can be disabled between 2 OAT values Heat recove...

Страница 20: ...e this function select room temp in the configuration menu If OAT TT06 correction is selected there is outdoor compensation on setpoint according the graph RAT TT05 setpoint correction 30 20 10 0 10 20 30 40 50 C OAT C TT06 X1 X3 Y3 2 K Y1 2 K Y2 0 K X2 ...

Страница 21: ...room temperature drops below threshold Maximum Room Temperature TT05 Surveillance Restart unit with mechanical cooling if room temperature rises above threshold These functions are available only for control on room temperature or when night cooling is selected To set the parameters for this function go to the menu Actual Setpoint Room Temperature Summer Night Ventilation Free Cooling Restart unit...

Страница 22: ...can also be selected with a remote contact on a digital input of the controller To activate this function set Runmode to Contacts 4 3 3Air Flow Control To activate this function set Fan control to Flow or Flow high low in the configuration menu Setpoints for this function are available in the menu Actual Setpoint flow supply fan and flow extract fan Supply and extract air are maintained at the des...

Страница 23: ... than 3 K by default from the actual setpoint an internal timer is started After an elapsed time of 10 minutes by default the unit is switched off and a low temperature alarm is generated in the controller The auto reset function starts the unit again after 50 minutes by default If the low temperature condition still exists the cycle is repeated if not the unit continues to run If a low temperatur...

Страница 24: ...trolled 4 2 Occupancy Management Occupancy can be monitored internally stand alone mode or externally remote mode The mode of operation must be selected in the web browser under runmode in the Actual Setpoint screen or with the external display under Runmode The following modes of operation can be selected Manual Off Unit is always in unoccupied mode Manual On Unit is always running in occupied mo...

Страница 25: ...e For units with electrical heaters the fans may stop with a short delay to evacuate heat from the unit 5 HHFlex OPTIONAL CONTROL FUNCTIONS 5 1 Air Dampers Parameter for this function is available in the menu Actual Setpoint extract fan supply fan The exhaust CD05 opening extract CD02 opening supply CD04 opening and fresh air intake CD01 opening can be equipped with dampers If a start command for ...

Страница 26: ...Up This function is not active when indoor unit is selected To avoid unintentional frost alarm a startup delay mode for winter operation is programmed If the outdoor temperature is below a preset value default 5 C the fans will only be started after a fixed preset time delay 5 min in order to pre heat the heating coil During this time delay the hot water control valve is opened at a preset value d...

Страница 27: ...ode heating mode if water temperature is above 28 C cooling mode if water temperature is below 18 C If the temperature is between the above mentioned settings the last monitored thermal mode is maintained until the preset value of the other mode is exceeded 5 8 2Temperature Control If heat recovery is not enough to control temperature the Cold Water Coil will be basically controlled as shown in th...

Страница 28: ...the supply fan is controlled like in occupied mode The extract fan is off 5 8 8 Backup electric heater The application of a change over water coil involves a greater risk on unavailability of heating capacity when required This situation occurs for instance when there is no warm water available because the heat pump is in cooling or defrosting mode If a backup electric heater is selected to secure...

Страница 29: ...ulating pulse signal generated by the controller During each voltage pulse period the solid state relays are activated and give power supply to the heating rods The pulse signal is basically an on off voltage signal but due to its switching frequency a proportional performance operation of the electric heater is achieved The pulse control signal operates on all groups simultaneously 5 9 2Overheati...

Страница 30: ...signal generated by the controller During each voltage pulse period the solid state relays are activated and give power supply to the heating rods The pulse signal is basically an on off voltage signal but due to its switching frequency a proportional performance operation of the electric heater is achieved The pulse control signal operates on all groups simultaneously 5 10 2 Overheating protectio...

Страница 31: ... equipped with a frost coil with frost protection thermostat the frost thermostat on the heating coil downstream the heat recovery device is omitted The default hardware setting for the frost thermostat alarm is 5 C 5 11 3 Warm Up at Unit Start Up This function is not active when indoor unit is selected To avoid unintentional frost alarm a startup delay mode for winter operation is programmed If t...

Страница 32: ... this minimum airflow has been reached an on off output allows operation of the outdoor unit compressors if a cooling or heating demand exists The minimum air flow is pre configured based on the AHU size but can be adjusted in the Factory menu 5 13 Water pump anti blocking system To avoid rotor blocking the pump receives a periodic run command pre configured every Monday from 10 00 to 10 02 h this...

Страница 33: ...y loaded 5 15 3 Minimum fresh air threshold The mix command can be clamped by the minimum fresh air threshold value For example if minfreshair 20 then the maximum allowed value for mix command is 100 20 80 The primary heat recovery system shall be turned off when the recirculation is 100 Output command Recirculation Analog Outdoor Analog Exhaust Digital INDOOR OUTDOOR 100 50 0 100 Mix command 100 ...

Страница 34: ...g capacity with fresh air calculation In some condition sucha as duct pressure airflow control the airflow may vary in great proportion Indeed the amount of fresh air cannot be fixed considering only the recirculation damper opening Thus the fresh air rate can be estimated using Mixing Air Temperature method To do this an additional temperature sensor is needed after the mixing section and before ...

Страница 35: ...y possible if the HHFlex controller is configured to control the supply air temperature TT02 During this mode supply air temperature control can be deactivated but ventilation will be controlled as in the occupied period 5 19 Heat pump defrost In the defrost period of a heat pump connected to the AHU the recirculation mode can be forced This ensures that no cold air is introduced during the period...

Страница 36: ...e outdoor temperature compensation if activated depending on offset actual setpoint measured value a master control signal will determine the actual setpoint of the supply air humidity control loop actual humidity in supply air is measured depending on offset the slave control signal to the humidifier adjusts the performance for the momentary demand the set limitations for supply air humidity will...

Страница 37: ... decreasing supply temperature at rising outdoor temperature TT06 e g outdoor temperature rising from 10 C to 20 C causes a supply temperature shifting from 22 C to 16 C Attention For every unit it shall be checked if the default values are suitable for the actual application humidification process and moisture demand in the building Correct parameter settings for humidification require basic know...

Страница 38: ...roller software calculates the matching moisture content depending on offset the slave control signal to the cooling coil adjusts the dehumidification performance for the momentary demand a peak value selector within the controller will always transmit the highest control signal generated by cooling dehumidification demand to the cooling coil the set limitations for supply air humidity will limit ...

Страница 39: ...re displayed in de Alarm Status screen 6 3 Alarm report To permit alarm and alert reporting on LEDs or on the building management system two outputs are available on the customer terminal strip A digital 24 VDC output to report alarms A digital 24 VDC output to report service alerts 6 4 Resetting Alarms When the cause of the alarm has been corrected the alarm can be reset depending on the type eit...

Страница 40: ... controller activated Warning Extract Filter High Delta P Alert Manual Input of the controller activated Warning End Filter High Delta P Alert Manual Input of the controller activated Warning Supply Pressure Filter Failure Manual Defective sensor or installation fault Warning Exhaust Pressure Filter Failure Manual Defective sensor or installation fault Warning Pressure End Filter Failure Manual De...

Страница 41: ...igurable in the extra settings menu Input of the controller activated Configurable in Actual Setpoint Extra settings Supply fan off Extract fan off default Supply fan on Extract fan on Supply fan on Extract fan off Supply fan off Extract fan on When on is selected fan is running at a configurable fixed fan speed Battery low or missing Change it quickly Automatic Internal monitoring Warning Pump Co...

Страница 42: ...n whether to read or write values A function also describes what signal type it is meant for Supported Modbus functions 1 Read Coils 2 Read Discrete Input 3 Read Holding Register 4 Read Input Register Direct 16 Bit 5 Write Single Coil 6 Write Single Register 15 Write Multiple Coils 16 Write Multiple Registers 7 2 4Max 47 registers Max 47 registers can be read in one message 7 2 5Communication limi...

Страница 43: ...43 7 3 BACnet IP BACnet communication takes place via IP IP port main controller ...

Страница 44: ...44 7 4 ANNEX 1 BACNET PROTOCOL IMPLEMENTATION AND CONFORMITY ...

Страница 45: ...45 ...

Страница 46: ...46 ...

Страница 47: ...47 Systemair B V Zanddonkweg 7a 5144 NX Waalwijk The Netherlands Phone 31 0 85 00 66 200 www systemair nl ...

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