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6.4.2.5 Free heating

In units equipped with an external air damper the controller can use the external air conditions, where these
are favourable in terms of temperature, to cool ambient air by properly managing opening of the external air
damper.
Damper modulation is implemented within the free heating differential (same value as free cooling), and it must
be set with an offset with respect to the winter operating setpoint.

Temperatures conditions requested to activate free heating and damper management are reported in the first
picture.
The figure graphically shows the conditions required for free heating activation and damper management.
If the temperature of the external air is higher than the ambient temperature plus the differential for free
cooling/free heating enabling (DenFCH), the unit is enabled for free heating operation.
Damper modulation occurs within the free heating differential (DFH). Dampers control logic during free heating
differential (DFH) are reported in the second picture. Starting from its min. value, damper opening begins at
the winter setpoint (SpH) plus the free heating offset (OFC): it reaches its max. value at the winter setpoint
(SpH) plus the free heating offset (OFH) minus the modulation differential of the free heating damper (DSFH).
Opening of the external air damper can be limited by the evaporation pressure value during winter operation.
This function is illustrated in a dedicated section.

The setup values given to the parameters above help to control the priority of the cooling devices according to
the combinations below:



the free heating damper is opened first; the compressors are only started after the damper has

achieved its max. opening, if the ambient air temperature setpoint is not met;



compressors are started first; the free heating damper is only opened if the ambient air temperature

setpoint is not met;



the free heating damper and the compressors are started in parallel.

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Содержание UATYQ20-115ABAY1

Страница 1: ...Issue 12 18 ESIE18 19A Roof Top Controller Application software UATYQ20 115A BA FC2 FC3 Y1...

Страница 2: ...We reserve the right to make changes without prior notice 2...

Страница 3: ...ication of the list of terminals for the pCO boards in the network 16 3 1 4 Network error messages 18 3 1 5 Network status 18 3 2 FILES TO BE UPLOADED FOR CONTROLLER PROGRAMMING 19 3 3 BIOS AND BOOT C...

Страница 4: ...using the keyboard 45 6 5 2 Summer to Winter mode switching using a digital input 45 6 5 3 Automatic Summer to Winter mode switching 45 6 6 COMPRESSOR AND REFRIGERANT CIRCUIT OPERATION 45 6 6 1 Compre...

Страница 5: ...MENU 89 7 12 HISTORY MENU 92 7 13 SUMMER WINTER MENU 93 7 14 UNIT SELECTION MENU 93 8 ALARMS 94 9 QUICK GUIDE 100 10 PROCEDURES REQUIRED TO ENABLE ACCESSORIES SUPPLIED WITH THE UNIT 102 10 1 ELECTRIC...

Страница 6: ...8 Page 103 10 6 Activation of control logic of supply and return plug fans on temperature setpoint 06 05 2019 1 2 Purpose of the manual This manual was drafted with the purpose of giving the informati...

Страница 7: ...vap Evaporation pressure differential DSFC Differential for modulating the free cooling damper DSFH Differential for modulating the free heating damper DTc Cooling differential DTh Heating differentia...

Страница 8: ...temperature or return temperature Tae External air temperature Tm Delivery temperature TmLs Max temperature in delivery line summer mode TmLw Max temperature in delivery line winter mode URa Relative...

Страница 9: ...g a micro processor controller and an internal memory The board may be supplied with various interface cards for communication with the control systems The user interface consists of a backlit LCD mon...

Страница 10: ...values in the various fields This button referred to as arrow down in the rest of the manual is pressed to scroll the screens of the various branches and to edit reduce the values in the various field...

Страница 11: ...tional serial boards for the BMS1 port in the controller One board from those available may be selected serial board RS485 featuring Modbus RTU or Carel protocols LON FTT10 board with Lonworks protoco...

Страница 12: ...communicate with each other The number of elements making up the system varies according to its complexity the basic one consists solely of an I O board and a terminal for management of units with one...

Страница 13: ...he pLAN network communicates through standard RS485 serial with baud rate of 65 2 kbit s It uses the Carel Multimaster protocol and can have a maximum extension of 500 m using T switches for remoting...

Страница 14: ...e Below are the addresses that need to be set up in boards and terminals Unit no 1 2 3 4 5 6 7 8 I O board address 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Private dedicated terminal address 17 19 21 23...

Страница 15: ...er the terminal addressing field The arrow up and arrow down buttons can be used to change the address of the terminal In the figure the address of the terminal is 17 terminal of board n 1 After corre...

Страница 16: ...ocedure for the identification of the list of terminals for the pCO boards in the network This procedure is used to enable the terminal s envisaged in the network to display the parameters of the I O...

Страница 17: ...he value to be entered is 17 After confirming assignation of the terminal to address 17 through the confirm arrow button for displaying the I O board with address 1 the cursor will move under the colu...

Страница 18: ...sages from the network synchronisation signals for a time longer than 10 seconds This alarm corresponds to the turned off green LED of the addressing board 3 1 5 Network status During operation of the...

Страница 19: ...version is obsolete for the new board supplied with the software BIOS does not require updating if the BIOS version in the board is aligned or is more recent than the software version Refer to the in...

Страница 20: ...e VCP drivers to operate the converter When the converter is connected to a USB port in the personal computer for the first time the system detects the new hardware and asks you to install the VCP dri...

Страница 21: ...set up with various functions which contribute to making the best use of it in different applications When the key is plugged into a computer the arrow symbols take different meanings as listed in the...

Страница 22: ...based on the selected mode If the key is not type C the mode button is disabled and OFF The Start button triggers the reading or writing process which is indicated by the corresponding symbol flashin...

Страница 23: ...ers supplied with a USB Host master port can be programmed using a USB pen drive and the controller display A USB pen drive must be available containing at least the following files application file i...

Страница 24: ...he arrow buttons to move the cursor to FLASH USB MEMORY and then press Enter Click the arrow buttons to move the cursor to USB PEN DRIVE and then press Enter Click the arrow buttons to move the cursor...

Страница 25: ...ressing the Alarm and Enter buttons simultaneously for a few seconds which causes the following screen to appear SYSTEM INFORMATION LOG DATA OTHER INFORMATION Press the arrow buttons to move the curso...

Страница 26: ...next event click the arrow down to move back to the previous event and click the Enter button to move on to the next level where the values recorded at the time of the event can be viewed 4 DD MM YY...

Страница 27: ...a description of the download procedure Alternatively logs can be downloaded onto a USB pen drive following the procedure described above for board programming The only difference is selection of the...

Страница 28: ...components connected to the terminal The I O board xx fault alarm message appears The power board with address xx is not working properly Check the LEDs of the corresponding serial addressing board Th...

Страница 29: ...robes normally used for temperature or humidity measurements using a voltmeter take a measurement between the GND terminals and the Bn terminal for the input connected to the probe to be checked start...

Страница 30: ...e temperature value changes The read value can be found by disconnecting the probe from the input and measuring its resistance with a multimeter NTC probes C Kohm C Kohm C Kohm 20 67 74 4 22 99 28 8 9...

Страница 31: ...ID 4 Main fan overload switch ID 5 Remote ON OFF ID 6 Thermal overload switch in heater 1 ID 7 Low pressure alarm in circuit 1 from pressure switch ID 8 Overload switch in compressor 1 comp 1 circuit...

Страница 32: ...valve in circuit 2 NO17 Heating valve status NO18 Humidifier ON OFF control Analogue outputs Y1 External air damper Heat recovery analogue output Y2 Supply plug fans Modulating control in humidifier...

Страница 33: ...e following ways using the keyboard by time slots where enabled by the control system only in cases where a BMS control system is enabled All the OK signals must be enabled if the unit is to be switch...

Страница 34: ...system changes the status of the machine status digital variable The digital variable is included in the list of variables in the control system 6 3 Ventilation management Unit start up firstly causes...

Страница 35: ...pply return airflow This function keeps the same airflow to the value Aset_1 also when the unit has reached the setpoint 2 Decrease supply return airflow This function adjusts and keeps the airflow to...

Страница 36: ...on allows to use a different set for the minimum opening of the external air damper when the outdoor temperature is above or bellow the desired range defined by the temperatures Tmin e Tmax usually re...

Страница 37: ...a few seconds and the entire unit is stopped too following an air flow alarm 6 4 Temperature regulation system One of the major purposes for which a roof top unit is designed is to safeguard the prese...

Страница 38: ...e has elapsed in cases when the activation of some compressors leads to a deadlock and the ambient temperature setpoint is not achieved 6 4 1 2 Free cooling In units equipped with an external air damp...

Страница 39: ...d zone value 1 2 ZN is between the winter setpoint and the beginning of the cooling differential C1 C2 DTh 1 2 ZN C4 C3 C2 C1 SPh Ta The controller automatically starts the compressors when the unit i...

Страница 40: ...ed generators where fitted are modulating type so they are managed as illustrated above for the modulating valve in the hot water coil The output signal from the controller and the adjustment paramete...

Страница 41: ...operation Damper modulation occurs within the free heating differential DFH Dampers control logic during free heating differential DFH are reported in the second picture Starting from its min value da...

Страница 42: ...drop below the setpoint and to prevent over cooling of the air the controller starts the heating devices e g electric heaters or the hot water coil where fitted to warm the air and to keep the desired...

Страница 43: ...eceives the ok signal when the relative humidity value measured in the room is lower than the setpoint SpUR minus the value of the neutral area ZNUR if any The humidifier command signal increases prop...

Страница 44: ...rding to the evaporation pressure and may be modulating within a specific opening range that is set in the controller This range is smaller than the standard opening range from min to 100 to reduce th...

Страница 45: ...except for the fans and it restarts them automatically as soon as switching is completed based on the load requirements Automatic mode switching is successful if the winter setpoint is smaller than th...

Страница 46: ...p time In this way the signal proportionally follows the pressure variation within the corresponding differential Dpcond The control signal of the fans may range between the min and max setpoints If t...

Страница 47: ...essure value exceeds the threshold setpoint increased by the reset differential stored in the controller 6 6 6 Defrosting During operation in heat pump mode defrosting is the process used to remove an...

Страница 48: ...ost threshold SPdfrf for longer than the start forced defrost delay the defrost cycle is started without waiting for the time between two consecutive defrost cycles to have elapsed The defrost thresho...

Страница 49: ...or a low pressure switch in this sequence A transducer low pressure alarm triggers when the evaporation pressure in winter mode drops below the low pressure threshold setpoint stored in the controlle...

Страница 50: ...densing pressure in summer mode and the evaporation pressure in winter mode as explained above 6 7 3 Limitation of air delivery temperature Temperature control always refers to the ambient temperature...

Страница 51: ...t differential If the differential setpoint is positive the summer setpoint increases as the air temperature rises on the other hand if the differential is negative the summer setpoint decreases as th...

Страница 52: ...wing cases may be observed 1 External enthalpy EN est is greater than ambient enthalpy EN amb which in turn is higher than the enthalpy setpoint Set EN Alternatively external enthalpy EN est is smalle...

Страница 53: ...s set the unit to OFF mode the anti freeze function cannot be enabled by digital input 6 7 7 Management of heater in condensate tray The software manages activation of a digital output that controls t...

Страница 54: ...ber of branches each of which features one or multiple screens that have different access levels either free or password protected A click on the Prg button in the home screen of the controller gives...

Страница 55: ...s editable fields click the Enter button to move the flashing cursor to the settable fields in the screen After setting the desired value or selecting the desired option using the arrow buttons click...

Страница 56: ...Unit in SUMMER M2 Time slot Dehumidify Compensation Unid en VERANO M2 Franj horar Deshumecta Compensaci n The screen shows whether the unit is running in summer or winter mode according to the set ti...

Страница 57: ...O ENTER par ENCEDER Press the Enter button to change the status of the unit if the unit is off it turns on and vice versa If the time slots are enabled the unit only gets started if the current time s...

Страница 58: ...meters Select the item Initialization in screen Z1 and press the Enter button to enter the Initialization branch Screen V0 appears on the display Inserire nuova V0 password 0000 Insert new V0 password...

Страница 59: ...in heat pump units The possible selections are NO normally open and NC normally closed Valvola caldo N C2 Num resistenze 2 Risc via RESISTENZE Heat valve S C2 Heater number 2 Heat by HEATER V lvula c...

Страница 60: ...options Temperature the mode is managed based on the difference between ambient and external air temperature Enthalpy the mode is managed based on the difference between ambient and external air entha...

Страница 61: ...measured by the probe The fourth line is used to set the max humidity threshold measured by the probe Sonda umidit Cc esterna S Ab allarme S Tipo 0 1 V Enable external Cc humidity probe Y Enable alarm...

Страница 62: ...Sonda Ci cond sbrin 2 S Tipo 4 20 mA En cond defr 2 Ci probe Y Type 4 20 mA Sonda Ci cond deses 2 S Tipo 4 20 mA This screen is used to enable the pressure probe in refrigerant circuit 2 where fitted...

Страница 63: ...according to which heat recovery is managed The possible selections are ambient temperature temperature in the delivery line and ambient enthalpy Abilitazione Cl Drivers EVD400 N EVD400 drivers Cl ena...

Страница 64: ...ted in the second line Compensazione G1 Setpoint N Setpoint G1 Compensation N Compensaci n G1 pconsig N This screen is used to enable offsetting of the ambient temperature setpoint in function of the...

Страница 65: ...creen is used to set the pressure setpoint for condensation control The third line in the screen is used to set the pressure setpoint for condensate control Ventilatore di G7a cond 1 comp attivo Setpo...

Страница 66: ...he voltage which corresponds to the max speed of the fans in the external coil The third line in the screen is used to set the voltage which corresponds to the min speed of the fans in the external co...

Страница 67: ...is screen is used to set the parameters required for the low pressure alarm generated by the transducer AL75 for circuit 1 and AL77 for circuit 2 in winter mode As soon as the low pressure threshold i...

Страница 68: ...washing function Opening is limited when the evaporation pressure drops below the pressure threshold recorded in the screen proportionally to the differential The third line in the screen is used to s...

Страница 69: ...ay compressor running 060s Retardo Off T4 ventil princ 240s Retardo arranque compresor 060s This screen is used to set the delay in the switch off of air treatment fans immediately after the unit swit...

Страница 70: ...Differential Y2 pressure probe Type 0 10 V Min 0000 Max 2500Pa Sonda de presi n Y2 differencial Tipo 0 10 V Min 0000 Max 2500Pa This screen is used to set the type of probe to measure the air differe...

Страница 71: ...when the fan speed is controlled manually The third line in the screen is used to set the min signal of fans on the air delivery side in manual mode The fourth line in the screen is used to set the ma...

Страница 72: ...to set the limitations of the airflow rate of the return EC fans once the summer winter set is reached In the third row it s possible to set the maximum airflow rate allowed in the screen S10 of the S...

Страница 73: ...offsetting function is enabled Compens Inv P6 Temp esterna 00 0 C Diff 05 0 C Max compens 05 0 C Winter compens P6 Ext temp 00 0 C Diff 05 0 C Max compens 05 0 C Compens Inv P6 Temp externa 00 0 C Dif...

Страница 74: ...ed alarm AL06 triggers to warn about high ambient air temperature when the temperature drops below the min limit alarm AL07 triggers to warn about low ambient air temperature The third line in the scr...

Страница 75: ...ters and their regulation differential The third line in the screen is used to set the offset for full activation of the electric heaters The fourth line in the screen is used to set the regulation di...

Страница 76: ...point for temperature based free cooling control The fourth line in the screen is used to set the air temperature differential for temperature based summer free cooling regulation Serr freeheating Pk...

Страница 77: ...reecooling at startup Washing N Pm Forzar freecooling al encender lavado N This screen is used to enable the washing function i e Free cooling overriding upon unit start up in order to change the ambi...

Страница 78: ...supervisory control and automatic unit restart after a main power blackout The second line in the screen is used to enable unit ON OFF remotely through a digital input The third line in the screen is...

Страница 79: ...3 h I 0060s D 00 0s Vent Plug fan P01 Param PID returno P 0700m3 h I 0060s D 00 0s This screen is used to set the parameters required to control the plug fans or the inverter controlled fans installed...

Страница 80: ...ing where fitted The third line in the screen is used to enable activation of the heater designed for condensate tray warming when the unit is switched to ON The fourth line in the screen is used to e...

Страница 81: ...nter to set a new language Dati unit Ay Matricola 12345678 Data coll 01 01 18 Collaudatore 0653 Unit data Ay Serial n 12345678 Test data 01 01 18 Tester 0653 Datos unidad Ay N de serie 12345678 Data e...

Страница 82: ...h Soglia tempo A9 funzionamento Comp 2 010000h Working time A9 threshold Compressor 2 010000h Umbral tiem A9 funcionamient Comp 2 010000h Soglia tempo Aa funzionamento Comp 3 010000h Working time Aa t...

Страница 83: ...sonda desescarche S 1 0 0 00 0bar S 2 0 0 00 0bar This screen is used to rectify the values measured by the pressure probes in circuits 1 and 2 We recommend that the value measured by a probe be recti...

Страница 84: ...nvers 1 N Valvola invers 2 N DOut test Ap Reversing valve 1 N Reversing valve 2 N Test DOut Ap V lvula invers 1 N V lvula invers 2 N This screen is used to manually enable the digital outputs of the c...

Страница 85: ...ed to control auxiliary output NO11 The third line in the screen is used to set the activation time of the auxiliary output when all compressors are OFF The fourth line in the screen is used to set ac...

Страница 86: ...Time zone K4 Summer working Internal set 27 0 C External set 30 0 C Fr horarias K4 Funcionamento verano Set interno 27 0 C Set externo 30 0 C This screen is used to set the summer operating setpoints...

Страница 87: ...orking Internal set 26 0 C External set 30 0 C Fr horarias K4 Funcionamento verano Set interno 26 0 C Set externo 30 0 C Fasce orarie K5 Funz invernale Set interno 21 0 C Set esterno 15 0 C Time zone...

Страница 88: ...is screen This operation is possible from the dedicated screen in the Clock menu Setpoint S1 Temp Inv 20 0 C Temperature S1 setpoint Win 20 0 C P consig S1 Temp Inv 20 0 C Screen S1 is used to set the...

Страница 89: ...ad the instant air flow rate relating to the fans fitted on the return line S9 Setpoint portata aria mandata in set 010000m h S9 Setpoint supply airflow on set 010000m h S9 Setpoint del flujo suminist...

Страница 90: ...mode the screen shows the condensing pressure while in winter mode the evaporation pressure is displayed Sonda I5 qualit aria CO2 0000ppm Air quality probe I5 CO2 0000ppm Sonda I5 calidad aire CO2 000...

Страница 91: ...FF Vent princ OFF Ic Humidificador OFF This screen shows the status of the fans on the delivery line main fans and the de humidifier where fitted Resistenza 1 OFF Id Resistenza 2 OFF Heater 1 OFF Id H...

Страница 92: ...tial pressure transducers in the delivery and return lines if plug fans or inverter controlled fans are featured Sbrinamento Iv1 T evap xx x C Set sbrin xx x C Countdown xxx s Defrost Iv1 Evap T xx x...

Страница 93: ...TER for WINTER Unid en R0 VERANO ENTER par INVIERNO A click on the Enter button changes the unit status This is feasible on exclusive condition that the unit is turned to OFF and automatic mode switch...

Страница 94: ...of all the alarms managed by the software their main causes some guidelines for their resolution the reset type and service to the unit and its devices The type of alarm reset is described in the RESE...

Страница 95: ...triggered in refrigerant circuit 2 summer mode generated by the low pressure switch Check the operating conditions Check the evaporation pressure Check the refrigerant level Check the evaporation fan...

Страница 96: ...n the controller Test the probe if it does not work correctly replace it Check the electrical connection of the probe Check the input of the controller board M No All devices and functions whose setti...

Страница 97: ...l AL32 A non serious general alarm has been output by the System ON digital input The digital input associated to a non serious external alarm has been opened Check the cause leading to opening of the...

Страница 98: ...he expansion board is outside the operating range Check the operating conditions Check the probe setpoint range stored in the controller Test the probe if it does not work correctly replace it Check t...

Страница 99: ...ompressors in circuit 2 AL78 WARNING Circuit 1 in Prevent low pressure The evaporation pressure in circuit 1 winter mode is lower than the Prevent value Check the operating conditions Check the refrig...

Страница 100: ...o confirm Editing the setpoint and differential for electric heater activation Units featuring enabled electric heaters In the Main screen Prg select the User menu Enter Key in the User password until...

Страница 101: ...otice 101 Keyboard controlled summer winter mode switching Unit in OFF mode and keyboard controlled summer winter switching enabled in screen C6 of the Manufacturer menu In the Main menu Prg select th...

Страница 102: ...oint the differential and the neutral regulation zone 10 3 Additional pCO WEB serial board on BMS1 port for BACnet or Modbus IP protocols Below is a simplified version of the procedure If problems occ...

Страница 103: ...ed different management protocols are available as described above The list of variables in the supervisory control is provided in a separate document If two management protocols are used simultaneous...

Страница 104: ...___________________________________________ ______________________________________________________________________________________ _____________________________________________________________________...

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