1 / 45

Uniflair ARA Range

Uniflair ARA Range. ARA. Nominal Cooling Capacities. ARAC – Air cooled water chillers ARAH – Air / water cooled heat pumps ARAF – Air cooled water chillers with free-cooling. Presentation.

oria
Download Presentation

Uniflair ARA Range

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Uniflair ARA Range

  2. ARA

  3. Nominal Cooling Capacities ARAC – Air cooled water chillers ARAH – Air / water cooled heat pumps ARAF – Air cooled water chillers with free-cooling

  4. Presentation • AQUAFLAIRARA is the new range of UNIFLAIR chillers and heat pumps created according to new and unique criteria regarding flexibility. • Featuring six air cooled models (0574A – 0644A – 0744A – 0964A – 1084A – 1204A) equipped with axial fans, with nominal cooling capacities ranging from 118 to 260 kW and available in three series: • - Chillers • - Heat pumps • Free-cooling • Standard operation with R407c refrigerant and, on request, R22 or R134a.

  5. Layout – Macro Components Simple maintenance and installation of components Easily accessible electrical panel Simple replacement of components (access from 3 sides) Protected user terminal Anti-vibration supports to avoid vibrations inside the unit

  6. Layout – Macro Components Fans Condensing section Shell & tube evaporator Water tank Expansion receiver (24 l - 10 bar max) Circulation pump Electrical panel

  7. Layout Temperature sensor H2O inlet Second temperature sensor H2O outlet Differential pressure switch Pump shut-off tap Temperature sensor H2O outlet Check valve

  8. Layout Scroll Compressors in tandem TWIN SYSTEM Expansion valve Expansion valve Accessible dehydration filters

  9. Layout • Main characteristics of the hydraulic section: • The check valve is downstream from the pumps: this allows easy replacement in the event of pump installation. • 1 or 2 circulation pumps (1+1 in stand by) with automatic control: exchange if one of the two is damaged. • Options: • 2 possible configurations: standard & high • pressure (150 and 300 kPa) • Water tank (500 litres and 650 litres) and expansion receiver with safety valve • Anti-freeze heaters • Algorithm regulation of the inlet water temperature

  10. Cooling system Twin system All of the units are equipped with 4 identically sized compressors placed in parallel in pairs on two refrigerant circuits. For this reason the circuits and the compressors are independent from each other. 4 STEPS AT ANY GIVEN TIME ELEVATED COP AT PARTIAL LOADS OPTIMUM MODULATION OF THE COOLING CAPACITY SUPPLIED BY THE UNIT

  11. Components – the compressor • All of the models are equipped with four rotary SCROLL compressors, connected in tandem. • All of the models have two independent refrigerant circuits, guaranteeing at least 50% of the cooling capacity in the event of problems with one of the two circuits as well as elevated energy performance at partial loads. • Electronic protection device on each compressor • Internal check valve on the compressor discharge • Rubber anti-vibration supports • OPTIONS: • Compressor discharge tap • A cover and other solutions which make the unit Low Noise • R134a on request

  12. Components – refrigerant circuit • Composed of two independent refrigerant circuits • Expansion valve with internal equalisation • Accessible dehydration filters • Valve on the liquid line and liquid sight glass with • humidity sensor • OPTIONS: • High and low pressure gauges (onboard) • High and low pressure transducers

  13. Components – fans • The units are equipped with axial fans which have a diameter of 800 mm. • There are between 2 and 8 installed on each unit. • They are directly coupled to the electric rotary motor which regulates the speed by means of modulating the power supply. • If it has been requested, modulating control of the condensing temperature is available with cut off regulation of the fan speed. • This control is standard in low noise and low water temperature versions and when the unit features total or partial heat recovery.

  14. Components – condensing coil • All of the units are designed to work with maximum external temperatures of up to 45°C. • Each unit features two coils which are placed vertically • Copper piping and collection trays and aluminium fins (pitch 1.8 mm) • OPTIONS: • Cataphoresis treatment (significant resistance to corrosion • thanks to epoxy resin covering) • Metallic protection filters for the coils • Cu – Cu protection

  15. Components – evaporating coil • Removable Shell & Tube chilled water exchanger: • Two gas circuits and a single hydraulic circuit which is able to operate with low head losses • The exchanger is completely insulated with closed cell expanded polyurethane to prevent the formation of condensation and to limit thermal dispersion • Equipped with anti-freeze sensors • OPTIONS: • Anti–freeze heaters around the evaporator • Hydraulic connection Kit (standard on units with pumps, water tank and ARAF)

  16. Components – anti-vibration supports Composed of four springs, these supports provide large deflection under load with a small footprint, and are therefore particularly effective at insulating at low frequencies. • Moreover, it is suitable to be used in environments which are particularly difficult and / or aggressive, since it is highly resistant to oil, corrosion and high temperatures. • Features: • the springs are made from elastomer with metallic inserts • the base is made from metal covered in elastomer • (Lexan with stud bolts).

  17. Hydronic section • The maximum working pressures are: • Basic version (without hydraulic fittings onboard the unit): 10barg • Basic version equipped with hydraulic connections onboard the unit: 6barg • All of the other versions: 5barg • LIST OF MACRO-COMPONENTS: • Pump group: 1 or 1+1, with standard or elevated head (optional); • Water tank (with primary / secondary predisposition) (optional); • Hydraulic tubes Kit: hydronic polyurathane fittings onboard the unit • (optional for ARAC and ARAH without pump group, standard with pump group or water tank and in the ARAF range). • Plus… • Expansion tray and safety valve • Water tank • Double pump shut-off valve • Bleeding valves on the connections • Anti-freeze heaters on the: evaporator, pumps, water tank, tube fittings.

  18. Diagram of the hydraulic circuit • Water tank • Pump shut off tap • Pump • Expansion collection tank • Check valve • Discharge water temperature sensor • Evaporator • Safety valve • Differential pressure switch • Second discharge water temperature sensor • Inlet water temeprature sensor Pumps: both standard and high head versions can be selected, featuring two pole motors, with 2900 rotations per minute. The materials used allow pump operation with pump temperatures between -10°C and 85°C.

  19. The control The AQUAFLAIRARArange is based on advanced technology which has lead to the use, even in the standard version, of a new advanced control. The control is based on a UPC1mcard and a mP20IIuser interface which is equipped with a large size display. Moreover, the units are equipped with a LAN card and, thanks to a RS485 serial adaptor(optional), are able to be connected to various supervision systems. The control is principally composed of: · microcompressor control board, to which the sensors are connected; · user interface. All of the control algorithms can be found in the microprocessor control and it is also where all of the operating parameters are memorised, displayed and set via the user terminal.

  20. The control The main functions which are offered by the system are: · discharge water temperature control based on a settable setpoint; · possibility of setting a double set-point (in cooling mode); · possibility of calculating the setpoint depending on the compensation of the external temperature; · complete alarm detection system with visual and acoustic signals, indicating the interventions needed to be carried out; · historical alarm events; · Alarm signal contacts divided by type; · possibility of programming automatic start-up when the power supply returns; · remote start-up/shut-down of the unit; · control of all of the compressors operating times, pump-down management and compressor rotation in order to guarantee efficiency and reliability; · 3 types of condensation regolation: modulating, step and ultra low noise step; · suction pump management; · anti-freeze heater management; · unit management in heat pump mode; · defrost management; · password on 2 programming levels (setting, hardware and software configuration); · possibility of communicating with a supervision system by means of a communciation protocol: Netvisor, Modbus, Bacnet, Lon, Metasys, SNMP (TCP/IP) and Trend;

  21. The control · clock/date management (optional clock card); · operating hours counter for the main components; · display of the operating status of all of the unit components and display of the values read by the sensors connected to the control board; · management of the local network with the possibility of placing a unit in stand-by and setting the operation of this unit in set back mode, regulation based on the average temperature and the implementation of step regulation; · override functionwith which the operation of the main components can be manually controlled · improved control algorithm which continuously measures the external temperature in order to operate more effectively in free-cooling mode.

  22. Programme identification Language change It is possible to see the programme version installed in the pCO1 at any time by using the key. This is very important if other units need to be connected to the same LAN network. In fact, it is necessary for all the units to have the same software installed. Moreover, it is possible to change the language used by pressing the buttons at the same time. However, the language cannot be changed on the menus concerning hardware and software configuration of the unit, that is, the service menu.

  23. Switch between units in LAN Display of unit status To pass from one chiller to another by means of the same user terminal when the units are connected on the same LAN network, these buttons must be pressed at the same time. The operating parameters of the unit (temperature, humidity….) can be seen by pressing the keys. Return to the status mask by pressing the button.

  24. SET POINT RESET To carry out a reset of the factory set set-point and other values (except the hardware configurations), press the and buttons at the same time for at least 5 seconds. OPTIONAL CLOCK CARD • If the microprocessor board has a clock card installed, the date and time will be shown on the status mask. • There is also the possibility of setting: • The start-up and shut-down of the unit according to a time programme. • Historical alarm event memory

  25. Access to the parameters: Consultation & Programming • READ ONLY: allows the parameters to be consulted without the possibility of modifying them. • READING & PROGRAMMING: allows the data and parameters which are memorised in the microprocessor board to be modified. • Press the button until an acoustic signal is heard • Immediately press the buttons • Insert the password required MEANING OF THE KEYS Allows the hour-counter to be reset and the hour thresholds to be modified for each component Allows the second level alarms to be configured Allows the real configuration of the unit, delay setting, manual start-up of the units and their components Contains all the functions linked to the clock card Allows the set points to be modified Allows the remote control, the LAn and the serial settings to be configured

  26. Hardware configuration The regulation programme of the unit needs to be “configured”, that is, adapted to the unit in which it is installed; it is necessary to define all of the elements featured on the unit and which the microprocessor must control. In general, this intervention is required only when the control is installed onboard the unit and this is therefore carried out in the factory during final testing; it may, however, be necessary to reconfigure the unit should further modifications be made to the unit. The passwords are contained inside an envelope along with the documentation which is sent on delivery of the unit. For simple settings the password is 0000, while for hardware configurations it is 0121.

  27. Hardware configuration • Mask 60 allows: • • Configure the type of unit depending on if the unit is: • - a standard chiller • - low temperature chiller • - chiller with condensing heat recovery • - heat pump • - heat pump with condensing heat recovery • chiller with free-cooling • • Selection the number of pumps and modulating regulation of the fan speed. Mask 61 allows the type of refrigerant gas to be set.

  28. Hardware configuration Allows the minimum and maximum limits of the set point to be set. Mask64allows the parameters and and condensing temperature intervals to be set by using a remote control switch with a star connection (lowest speed) and a triangle connection (maximum speed). 􀂉 T.Cond.Preset.:when one of the two circuits moves from operation with one compressor running to operation with two compressors running, automatic change from star to triangle only occurs if the condensing temp. (during star operation) is higher at that value. 􀂉 T.Cond.y Set.P.: if the condensing temperature exceeds this value when two compressors are operating on one circuit, it switches to triangle operation; 􀂉 T.Cond.D Set.P.: if, in triangle operation, the condensing temperature falls below this value, it returns to star operation.

  29. Hardware configuration The T.ev.Preset , T.ev.Y SetP and T.ev.D SetP parameters which appear on the following masks have the same means as the previous ones, the only difference being that they refer to the evaporating temperatures. Star / Triangle regulation and viceversa

  30. Hardware configuration Mask 66 allows the frequency of the electric network to be set for fan operation. Mask 67 and the ones following it allow the parameters concerning modulating regulation of the fans to be set depending on the condensing pressure: by setting the low noise mode the fan speed regulation is based on three steps rather than two.

  31. Hardware configuration Standard modulating regulation Modulating Regulation in low noise mode

  32. Hardware configuration In units with free-cooling, the mask which is shown here appears which allows the start-up delta T to be set. When the external air temperature is lower than the inlet water temperature by the value indicated, the unit enters into free-cooling mode: the water circulation pump through the free-cooling coil activates and changes the profile of the compressor insertion steps to increase the efficiency of the air-water exchanger. It is also possible to activate free-cooling in the stand – by units.

  33. Hardware configuration Intelligent Free Cooling activated also in the stand – by units

  34. Hardware configuration Screen 74gives the option of activating or not the water circulation pump through the free-cooling coil in anti-freeze function. If it is activated in the stand-by unit, the FC pump is switched on as soon as the external temperature falls below 4.5°C; it switches off when it rises above 5.5°C. N.B.:Only a correct glycol mixture ensures that the coil does not freeze if the external temperature falls below zero: the function indicated does not guarantee the integrity of the coil aboveall at extremely low temperatures

  35. Hardware configuration PROGRAMME SETUP This function can be useful if there is “fouling” of the data (set-point, configuration, etc.) since it enables the memory to be cleaned(including the data concerning the HARDWARE configuration of the unit); all of the set points will automatically be resetto the values set in the factory (see the "DEFAULT VALUES” section). After this operation has been carried out it is necessary to reconfigure the control and change the set-points if they are required to be different from the default values. AL. PAGE CLEAR-UP. The cleaning of the historical alarm events cancels all of the alarm events held in the memory. HARDWARE SET-UP. This enables automatic recognition of the devices connected to the control. This operation is useful when options need to be added to the board, a sensor needs to be replaced or when the display shows "NC" instead of a temperature sensor reading.

  36. Remote control of the unit Start-up and shut-down of the unit can be carried out alternativelyby means of: 1. A remote contact (or “remote control"); 2. A “Supervision system" connected to the microprocessor with a serial cable. The control of the resources with which the unit is equipped is, however, carried out by the microprocessor. ON/OFF BY REMOTE CONTACT: start-up of the unit is carried out by the closure of a remote N.O. contact when power is connected to the main board (see electrical diagram). In units with a standard regulation programme the digital input 1 is dedicated to the sart-up/shut-down of the unit. SUPERVISION SYSTEM: a supervision system exchanges data via a serial cable with the main board of the unit and is controlled remotely; for this reason an optional Serial Cardis available which opto-couples the interface to a RS485 network to transmit data.

  37. Remote control of the unit • Mask 141allows the following to be set • The serial address of the unit connected to the serial supervision network • 2. The speed of the data transmission : 1200, 2400, 4800, 9600 and 19200 per RS485. • 3. The type of protocol (standard or Modbus). Moreover, on the fourth line the number of units connected in the LAN local network is set (if the unit is predisposed for LAN connection)

  38. Units in a local LAN network • • presence of such management (Yes/No); when automatic rotation is activated, on a unit with an address lower than the network it is necessary to press the ON button. • • the duration of the automatic cycle between one inversion and the next; if it is zero ("0") the control will carry out a test, placing the units in rotation at intervals of 2 minutes. • • the number of units in stand-by • Automatic rotation can happen: • • on a timed basis (according to the time of the above mentioned cycle); • • following a second level alarm, that is following an alarm for which AR or BR has been set in the alarm address mask. • Mask 143, which is only displayed if the local network is configured, allows the temperature regulation to be managed in three different ways: • Independent mode: the unit control only manages water temperature regulation; • Interconnected mode: the unit control carried out water temperature regulation by calculating the average temperature of the units which are operating. • Cascade mode: The control carries out an off-set on the regulation set point depending on the units connected in the network enabling the units therefore to be switched on in succession. Each unit maintains its own regulation schedule.

  39. Units in a local LAN network • Mask 144, which is only displayed if the local network is configured, allows the unit operation to be managed according to the average temperature reading taken from the ambient of with a "local" value taken from a single sensor present inside the unit: • Mode: Local - Unit control is based on the temperature and humidity readings read by the sensors present on the unit. • Mode: Average – Unit control is based on the average temperature and humidity reading read by the sensors present on the units connected in the local network. • If the difference between the average value and the reading taken by a single sensor is higher than the “AVERAGE/LOC. DIFF.“ value (which by default is 2°C), the control automatically changes from “AVERAGE” mode to “LOCAL” mode.

  40. Operating parameters – the setpoint • Mask 120 does not allow settings. The discharge water temperature setpoint used as a reference point for regulation is shown. • A message is shown in the third and fourth line indicating the origin of the setpoint value if it is different that that which is set as standard: • Compensation T.ext.: indicates that the setpoint shown in the second line is calculated according to the external temperature (according to the parameters set in the masks shown on the following pages); • Optional SetPoint: indicates that a second setpoint is activated due to the commutation of the contact for digital input 10; • Supervision SetP.: indicates that the setpoint on the set-back cycle is activated; • - RemoteOffset Activated: indicates that the setpoint is calculated based on the offset read by the analogical input 3 (an option which is possible only if there isn’t an evaporator pressure sensor present).

  41. Operating parameters – the setpoint This allows the main cooling setpoint to be set and an eventual “second setpoint” activated via commutation of a contact connected to digital input 10. This allows summer compensation of the ccoling setpoint to be set according to the external temperature based on a ramp in which the coordinates of the two angular P1 and P2 points are indicated.

  42. Operating parameters – set back cycle The set back cycle consists of the automatic start-up of a unit which is switched off – but connected to the power supply – based on a settable setpoint. Basically, the intervention of the set back cycle has the task of controlling the ambient conditions – even in a large area – and even when the system is switched off; its intervention is therefore not conditioned by the signals issed by a remote controlled system, over which it has priority. The intervention of the set back cycle is not considered an alarm condition.

  43. Reading of the alarms By pressing the button the alarm buzzer will switch off and the alarm description will be shown on the display. If the cause of the alarm has been eliminated, the last alarm message can be reset By pressing the button for a few seconds; the red light on the button will turn off immediately. If the cause of the alarm has not been eliminated, the acoustic signal made by the buzzer will be activated once more. HISTORICAL ALARM SEQUENCE In order to be able to reconstruct the historical alarm sequence, the microprocessor keeps the last 100 alarm events in its memory. All of the memorized alarm events can be read in series by pressing the button on the STATUS mask. For alarms which are still active, general guidelines are shown underneath the description to resolve the problem.

  44. Reading of the alarms For a more in-depth description of each alarm please refer to the Control Manual. Thermal pre-alarm of the compressor 1 This automatically re-arms when the contact closes. If it is triggered three times in a row within a period of three hours, the alarm is activated (N.B.: it is necessary to reset).

More Related