RLA kw TECHNICAL MANUAL AIR COOLED WATER CHILLERS WITH HELICAL FANS

Transcription

1 RLA AIR COOLED WATER CHILLERS WITH HELICAL FANS FERROLI adheres to the EUROVENT certification programme. The products concerned appear in the products guide to kw TECHNICAL MANUAL

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3 TABLE OF CONTENTS THIS MANUAL IS DIVIDED INTO SECTIONS. THEIR NAMES APPEAR IN THE HEADING OF EACH PAGE. GENERAL SPECIFICATIONS PRESENTATION OF THE UNIT IDENTIFICATION CODE OF THE UNIT DESCRIPTION OF THE COMPONENTS OPTIONS AND ACCESSORIES MECHANICAL ACCESSORIES DESCRIPTION OF THE CONFIGURATIONS ELECTRICAL ACCESSORIES MECHANICAL OPTIONS ELECTRICAL OPTIONS COMBINATIONS OF ACCESSORIES-MODELS TECHNICAL SPECIFICATIONS AND STANDARD PERFORMANCES - R407C TECHNICAL SPECIFICATIONS OF UNIT AB-7M NOISE LEVELS STANDARD PERFORMANCES AB-7M TECHNICAL SPECIFICATIONS OF UNIT AS-7M NOISE LEVELS OF THE UNIT STANDARD PERFORMANCES AS-7M OPERATING RANGE OPERATING RANGE HOW TO SELECT THE UNIT WATER PRESSURE DROP WORKING HEAD MAXIMUM VOLUME OF WATER MAXIMUM VOLUME OF WATER IN THE SYSTEM WITH WET MODULE OVERALL DIMENSIONS - MINIMUM SPACE REQUIRED AND WEIGHTS OVERALL DIMENSIONS DESCRIPTION OF THE COMPONENTS MINIMUM SPACE REQUIRED FOR OPERATION POSITION OF WET CONNECTIONS MOD POSITION OF WET CONNECTIONS MOD WEIGHT DISTRIBUTION DURING OPERATION

4 GENERAL SPECIFICATIONS Presentation of the unit This new series of industrial chillers has been designed to meet the air conditioning requirements of medium-large systems in the industrial, service and business sectors. Suitable for outdoor installation, they are built for various types of system and to comply with the needs of highly qualified planning engineers. The complete series for use in hydronic systems includes six sizes with refrigerating power ratings ranging from 149 to 311 kw. When the units were designed, particular attention was also paid to sound emission in our endeavour to comply with the increasingly more restrictive laws governing acoustic pollution: all the sizes are therefore available in both the basic and silenced versions, to choose depending on the noise level required. All the units can produce cold water at a temperature between 5 and 10 C and are also pre-engineered for operation at low outdoor air temperatures thanks to use of a monitoring system through control of the fans by steps. All the units have 2 independent chilling circuits, each of which is equipped with two Scroll compressors. This allows the power generated by the unit to be modulated from 25% to 100%, and to thus adapt to the heat load of the system supplied. All the units are equipped with a thermal barrier plate type evaporator protected by means of a differential water pressure switch and electric antifreeze heater, coils with extended surfaces and extensive heat exchanging areas formed by copper pipes and notched aluminium fins, electric fans with scythe-shaped vanes to reduce the sound emission, electric panel for adjustments and controls, controller with microprocessor. The standard supply can also be integrated with a vast range of electrical and mechanical accessories. The Water Storage Tank and Pumping Module with 1 or 2 Pumps are particularly important accessories. If both are chosen, the tank is configured for storage on the delivery to the system or for storage on the return part of the system, or for storage pre-engineered for the primary and secondary circuit, depending on the type of Pumping Module selected. The chillers have been designed for use with R407C eenvironment-friendly refrigerant. All the units are accurately built and tested individually. Installation only requires electrical and wet connections. Identification code of the unit The codes that identify the units are listed below and include the sequences of letters that determine the meanings for the various versions and set-ups. IR VB - AB M - 5 Type of unit IR - Unit for installation in a Hydronic system, operating as a Chiller Type of Power Supply 5-400V - 3ph+N - 50Hz N of compressors= 4 Size of unit Version of unit VB - Base Version Acoustic Version AB - Basic Version AS - Silenced Version This version includes soundproofing of the compressors and fans with reduced rotation rate Type of Refrigerant 7 - R407C Climatic Limits M - Medium temperatures The unit is suitable for use in places with the average temperatures typical of temperate climates, within limits to use up to C. 4

5 GENERAL SPECIFICATIONS Description of the components 1. Fans. These are the helical type with scytheshaped vanes to increase efficiency and reduce the sound emissions. The fans are directly coupled to the threephase motor by means of an external rotor. Thermal protection against operating faults is installed inside the winding. 2. Electric control and monitoring panel. It is housed in a cabinet made of adequately thick painted sheet metal suitable for outdoor installation (protection degree IP 54). The panel comprises the following main components: Main door-locking circuit-breaker. Disconnectable fuse holders with protection fuses for each compressor Disconnectable fuse holders with protection fuses for the oil heaters of the compressors. 1 2 Disconnectable fuse holders and protection fuses for the antifreeze heater. 3 4 Control contactor for each compressor. Disconnectable fuse holders with fan protection fuses. Fan control contactors. Magnetothermic relay/s and contactor/s for the pump/s (if one of the pumping module accessories is installed). Fan speed control board. Insulating and safety transformer to power the auxiliaries, protected with fuses. Basic monitoring board with microprocessor: the main functions of the monitoring board are: Temperature regulation of the water produced by the unit, operating hour counting for compressors and pump, balancing of operating hours for compressors, start-up timing, parameter entry digitized via the keyboard, alarm diagnosis. Functions associated with the digital inputs: low and high pressure, high compressor discharge temperature (accessory), correct electric power phase presence-sequence, thermal protection for compressors, thermal protection for fans, thermal protection for pump, differential water pressure switch, remote controlled ON/OFF commands. 1 2 Functions associated with the digital outputs: compressor control, water pump control, electric antifreeze heater, general alarm (can be remote controlled). Functions associated with the analog inputs: water inlet and outlet temperatures, circuit 1 and 2 coil temperatures. 3 4 Functions associated with the analog outputs: monitoring of the fan speed by steps in conjunction with the fan control board. 3.User interfacing terminal with display. On-off key. Operating mode selector key. Compressor on-off LED. Antifreeze heaters on LED. Check-control with alarm code display. 5

6 GENERAL SPECIFICATIONS 4. Compressors. These are the SCROLL type with orbiting coil equipped with built-in thermal protection and oil heater. As part of the standard supply, they are positioned on rubber vibration dampers to reduce the vibrations transmitted to the base of the unit. To lower the sound emission of silenced version AS, they are installed in a soundproofed booth made of galvanized sheet metal coated with polyurethane powder paints and covered in soundproofing material. 5. Bearing structure made of galvanized sheet metal coated with polyurethane powder paint to ensure good protection against adverse weather conditions. 6. Water storage tank (accessory that must be requested when the unit is ordered). Made of adequately thick painted sheet metal, this reduces the number of compressor start-ups and fluctuations in the temperature of the water conveyed to the users. It is insulated with thermal barrier insulating material to prevent the formation of condensation and heat exchanges towards the outside. In conjunction with the Pumping Module accessory, it can be supplied in 3 different configurations: Storage on the Delivery, Storage on the Return, Storage pre-engineered for the Primary and Secondary circuit. When the Pipe Kit accessory is used, the only configuration possible is with Storage on the Delivery. The water drain is installed under the tank as part of the standard supply. The water is turned on and off by a cock that allows the unit to be drained. 7 Air vent. The automatic type, turned on and off by a cock and positioned on the highest part of the tank. 8.Water safety valve, on the tank. It acts whenever faulty service leads to an operating pressure in the plumbing system that exceeds the valve opening value. 9.Antifreeze heater connection.1 1/4 female threaded connection pre-engineered for installation of the tank s antifreeze heater. 10. Evaporator, plate type made of braze-welded stainless steel (AISI 316), double chilling circuit and alternate water/refrigerant circuits. It is installed within a shell of thermal barrier insulating material to prevent the formation of condensation and heat exchanges towards the outside. Standard supply also includes a differential pressure switch on the water supply circuit to avoid the risk of freezing if the water flow is shut off for some reason. 11. Condensing coils, the aluminium finned pack type with shaped profile to increase the heat exchange coefficient and with copper pipes arranged in staggered rows. A sub-cooling section is integrated into the lower part. 12. Covering panels, made of galvanized sheet metal coated with polyurethane powder paints to ensure the utmost ability to withstand adverse weather conditions. 6

7 GENERAL SPECIFICATIONS Hydraulic and chilling circuit components 14.Refrigerant safety valve. (Conforms to the Directive governing pressurized vessels -PED). Installed on the delivery pipe of the compressors. It acts if critical service faults should occur. 15.Fluid cock - Gas cock. Allow all the refrigerant in the coils to be pumped and then stored so as to carry out servicing work or to replace all the components of the chilling circuit without having to drain it. 16.Dehydrator filter. Of the removable cartridge type. Retains impurities and traces of moisture in the circuit. 17.Fluid and humidity indicator. Signals when fluid passes through the circuit, indicating that the refrigerant charge is correct. The fluid indicator also changes colour to show the amount of moisture in the refrigerant. 18.Low pressure switch With fixed setting. It is installed on the intake pipe and blocks the compressors of the circuit if the operating pressures drop below the tolerated values. It automatically resets as the pressure increases. If it activates frequently, the circuit will block and can only be restarted by resetting via the user interface terminal. 19.High pressure switch With fixed setting. It is installed on the delivery pipe and blocks the compressors of the circuit if the operating pressures exceed the tolerated values. If it activates, the circuit will block and can only be restarted by resetting via the user interface terminal. 20.Electrical resistors to heat the compressor oil. One per compressor, belt type. It activates when the compressor switches off. Their task is to keep the temperature of the oil sufficiently high so as to prevent refrigerant from migrating during these pauses. 23.Fluid solenoid valve.one per circuit. They shut off when both the compressors of the circuit switch off, preventing liquid refrigerant from flowing towards the evaporator during periods at a standstill. 24.Thermostatic valve. With external equalizer. It s task is to supply the evaporator correctly, keeping the selected degree of superheat at a steady level. High temperature thermostat (accessory). One per compressor, installed on the delivery pipe to protect the individual compressor if the end of compression temperature exceeds 130 C. Differential water pressure switch. This is standard supply and is installed on the connections between the exchanger s water inlet and outlet. It blocks the unit if it activates. Pressure taps: 1/4 SAE (7/16 UNF) type with air pump. Allow the operating pressure of both the circuits to be measured in 3 main points: compressor delivery, flow-restricting component inlet, compressor intake. 7

8 OPTIONS AND ACCESSORIES Mechanical accessories GM (M) Pressure gauge unit. Consisting of 4 pressure gauges that display the pressure of the refrigerant fluid on the intake and delivery of the compressors of both circuits.. GP (M) Protective grilles. Consisting of metal grilles that protect the coils with extended surfaces. AVM (F) Spring vibration dampers. Consisting of 4 spring vibration dampers to install under the unit. They reduce the mechanical vibrations generated by the compressor and fans during their normal operation, and that are then transmitted to the bearing surface of the machine. The insulation degree provided by the vibration dampers is about 90%. SAA (M) Water storage tank. Made of adequately thick painted sheet metal, this reduces the number of compressor start-ups and fluctuations in the temperature of the water conveyed to the users. It is insulated with thermal barrier material to prevent the formation of condensation and heat exchanges towards the outside. The accessory is inclusive of water safety valve, air vent, water drain and antifreeze heater connection. In conjunction with the Pumping Module accessory, it can be supplied in 3 different configurations: Storage on the Delivery, Storage on the Return, Storage pre-engineered for the Primary and Secondary circuit. Pumping module with 1 o 2 Pumps (The second pump, installed in parallel to the first, allows to have one workable pump to use if the first doesn't work).: Besides the pumps, this accessory is equipped with all the hydraulic components (water filter, expansion tank, on-off valves, water pressure gauge) required for complete installation and easy maintenance. Different water accumulation tank configurations are therefore available in combination with the pumping module accessory: MP-AM : Storage on the water supply plant Delivery (1) : The pump draws water from the supply plant, sends it to the plate type heat exchanger and then to the inertial storage tank. In this configuration, when the pump operates in its nominal conditions, it is able to supply the circulating water with a residual head of about 120 to 210 kpa (from 12 to 21 m.w.c). MP-AR: Storage on the water supply plant Return (1) : The pump draws water from the inertial storage tank, sends it to the plate type heat exchanger and then to the system. In this configuration, when the pump operates in its nominal conditions, it is able to supply the circulating water with a residual head of about 120 to 210 kpa (from 12 to 21 m.w.c). MP - PS: Storage pre-engineered for the primary and secondary circuit. The pump s sole task is to allow water to circulate around the primary circuit: this circuit includes the storage tank and plate type heat exchanger (chiller s water circuit). Assembly of the pumping section for the secondary circuit is at the installer s charge and includes the storage tank (with pre-engineered wet connections) and the system to be supplied. KT - Pipe kit, consists of two steel pipes insulated with heat barrier material. If the Pumping Module accessory is not installed, the pipe kit is obligatory to be taken. Notes: (1): Refer to the respective values given for each unit in the Technical data section. 8

9 OPTIONS AND ACCESSORIES Description of the configurations MP - AM 2 Pumps with Water storage tank 9 7 MP - AM 2 Pumps without Water storage tank 1 1 IN IN 4 6 OUT OUT KT with Water storage tank 9 7 KT without Water storage tank IN OUT IN OUT KT. - Pipe kit, consists of two steel pipes insulated with heat barrier material. Allows the water IN / OUT connections to be routed to the machine. MP. Pumping module. It consists of: 1 On-off ball valves. Turn components such as the water filter, surge chamber and pump on and off when they require routine or supplementary maintenance. 2 Metal gauze water filter. Can be turned on and off and inspected. It is installed on the pump suction side. Prevents any machining residues (dust, swarf, etc.) that may be in the water pipes from entering the pump impeller or plate-type heat exchanger. 3 Hydraulic pump. Circulates water around the system. The pumps have a high head and suit the majority of installation requirements. The pump is safeguarded by a motor protector installed in the chiller s electric panel. 4 Surge chamber. This is a closed, diaphragm type chamber. It absorbs the variations in the volumes of water in the system caused by temperature variations. 5 Water filling.manual function with control positioned on the side of the unit opposite the electric panel and turned on and off by a cock that can be accessed by removing the rear panel. 6 Water pressure gauge. Connected to the water fill pipe. Displays the pressure of the water in the system. 7 Water safety valve. Standard supply. 8 Water outlet. Standard supply. 9 Air vent. Standard supply. 10 Antifreeze heater connection. Standard supply. 11One-way check valves. Only installed if the Pumping Module accessory with 2 pumps is installed (one valve for each pump). NOTE: it is essential to purchase the units with either the KT or MP accessory described previously. The choice of one automatically excludes the other. 9

10 OPTIONS AND ACCESSORIES Electrical accessories CR - Remote Control. This device consists of a remote control which allows all the control and monitoring functions of the control unit on the machine to be controlled up to 100 meters away from the actual machine itself. It has been specially designed for installation on a wall inside the building. Use a threepole. The transmission line must be routed in a dedicated duct, separate from any electric powering lines (230/400 V). It has four keys used to select the controls on the controller installed on the machine, the only difference being that the scroll-up and scroll-down functions have been separated from the mode and on-off keys in order to make the control easier to use. During normal operation, the operating temperature (or the temperature read by the probe on the exchanger inlet) in degrees centigrade appears on the LCD display or the alarm code, if at least one is activated. The temperatures read by the other probes can be read by means of a few simple operations. If faults occur during normal operation, the controller stops the machine and displays the code of the alarm in question. After the alarm has been checked and its cause eliminated, the controller can be reset by pressing the on/off key. The remote control has the following keys: The controller has five LEDs on the left-hand side of the interface, that display the status functions of the machine: LED of compressors 1 and 2 (circuit 1). LED of compressors 3 and 4 (circuit 2). Electric antifreeze heater LED. HEATING mode LED COOLING mode LED MODE KEY Selects the operating mode (waiting for start-up or operation) of the machine. ON-OFF KEY Allows the controller to be turned on and off and resets the alarms. MODE plus ON/OFF KEYS If pressed at the same time, are used to access and quit the various menu levels. UP KEY When the menu is displayed, is used to scroll forwards through the items in the menu itself, or to increase the value of a parameter. DOWN KEY When the menu is displayed, is used to scroll backwards through the items in the menu itself, or to decrease the value of a parameter. OP - Programmer Clock. Allows the unit to be turned on and off, depending on the selected time settings (up to 14 settings can be entered, divided as required throughout the 7 days of the week). RAG (F) Electric antifreeze heating element on the storage tank. Plug type. It activates in parallel with the evaporator s antifreeze heating element and keeps the water at a temperature able to prevent ice from forming during the winter, when the unit is not used. TAT - High temperature thermostat. Consists of two contact thermostats installed on the delivery pipe of the refrigerating compressors. They block the compressor if they detect a delivery temperature that exceeds a fixed value (that cannot be modified). Mechanical options Special finned heat exchangers Coils with copper fins Coils with tin-coated copper fins Coils with aluminium fins with acrylic coating Electrical options Power source voltage rating 230V-3-50Hz 10

11 OPTIONS AND ACCESSORIES Combinations of accessories-models Mechanical Accessories Electrical Acces. MODEL ACCESSORY CODE Spring vibration dampers Modulo di Pompaggio AVM 10 (F)(1)(4) AVM 11 (F)(1)(4) AVM 12 (F)(2)(4) AVM 13 (F)(2)(4) AVM 24 (F)(5) AVM 25 (F)(5) AVM 26 (F)(5) AVM 27 (F)(5) See tables below for models GM 1 (M) Pressure gauge unit GM 4 (M) GP7 (M) Protective grilles GP21 (M) SAA 13 (M) Water storage tank Standard SAA 14 (M) SAA 18 (M) MP7-AM (M) 1 Pump MP13-AM (M) With storage tank MP51-AM(M)(4) storage on the plant MP4-AM (M) Delivery 2 Pumps MP10-AM (M) MP48-AM(M)(4) MP8-AR (M) 1 Pump MP14-AR (M) With storage tank MP52-AR (M)(4) storage on the plant MP5-AR (M) Return 2 Pumps MP11-AR (M) MP49-AR (M)(4) MP9-PS (M) 1 Pump MP15-PS (M) With storage tank MP53-PS (M)(4) primary and MP6-PS (M) secondary circuit 2 Pumps MP12-PS (M) MP50-PS(M) MP55 (M) (3) 1 Pump MP58 (M) (3) Without storage tank MP60 (M) (3) MP54 (M) (3) 2 Pumps MP59 (M) (3) MP61 (M) (3) KT4 (M) (4) KT5 (M) (4) KT15 (M) (3) Pipe kit KT16 (M) (4) KT17 (M) (3) KT18 (M) (3) High temperature thermostat TAT2 (M) Remote control CR 1 (F) Programmer clock OP (F) Antifreeze heating element for the accumulation tank NOTES: (M): mounted in the factory (F): supplied for installation by customer (1): Basic version MODEL ACCESSORY CODE AVM 24 (F)(4) AVM 25 (F)(4) RAG1 (F) (2): Silenced version (3): Unit supplied without the water storage tank (4): Unit supplied with the water storage tank MATCHABLE UNIT IP 285 VB AB 7M5 IR 285 VB AB 7M5 IR 285 VB AS 7M5 IR 315 VB AB 7M5 IP 315 VB AB 7M5 IP 315 VB AS 7M5 IP 285 VB AS 7M5 IR 315 VB AS 7M5 MODEL ACCESSORY CODE AVM 26 (F)(3) AVM 27 (F)(3) (5): Please refer to tables below for coupling with each accessories: MATCHABLE UNIT IP 285 VB AB 7M5 IR 285 VB AB 7M5 IR 285 VB AS 7M5 IR 315 VB AB 7M5 IR 315 VB AS 7M5 IP 315 VB AB 7M5 IP 285 VB AS 7M5 IP 315 VB AS 7M5 11

12 TECHNICAL SPECIFICATIONS AND STANDARD PERFORMANCES - R407C Technical specifications of unit AB-7M5 Model UM Net cooling capacity (1) kw Net total power input (1) kw Maximum pressure on wet side (NB) 600 / 1000 kpa Gross cooling capacity (1)(E) kw Gross total power input (1)(E) kw Compressor specifications Type SCROLL Quantity 4 N N Throttling steps 4 N Oil charge Circuit 1 (1a+1b) l Circuit 2 (2a+2b) l Power input kw Plate-type heat exchanger specifications Quantity 1 N Water capacity l Water flow rate (1) l/s Water pressure drop (1)(E) kpa Specifications of coils with extended surfaces Number of coils 4 N Total area 11.6 m 2 Fan specifications Number of fans 4 6 N Diameter [ ] 800 mm Maximum speed 900 rpm Total air flow rate (2) l/s Motor rating 1.5 kw Water Storage Tank specifications* Water capacity 700 l * : The water storage tank is an accessory that must be requested when the unit is ordered. Pumping Module accessory specifications Model UM Pump power rating kw Surge chamber volume 24 l Service charge pressure of surge chamber 150 kpa Water flow rate (1) l/s Working head (1)(MP) kpa Electrical specifications (3)(MP) Power supply 400/3+N/50 V/ph/Hz Total maximum power input [ FLA ] A Total maximum power input [ FLI ] kw Total maximum surge current [ MIC] A NOTES: (1): The data refer to: Water temperature: inlet: 12 C - outlet: 7 C. Outdoor air temperature 35 C D.B. (2): At fan s top speed (3):At maximum tolerated operating conditions Noise levels (E) Mod. SWL (db) SPL Octave bands (Hz) Total (dba) db db(a) ,4 95,2 92,8 90,4 87,9 84,9 77,1 67, ,4 95,2 92,8 90,4 87,9 84,9 77,1 67, ,4 96,2 93,8 91,4 88,9 85,9 78,1 68, ,4 97,2 94,8 92,4 89,9 86,9 79,1 69, ,4 97,2 94,8 92,4 89,9 86,9 79,1 69, ,4 98,2 95,8 93,4 90,9 87,9 80,1 70, ,4 99,2 96,8 94,4 91,9 88,9 81,1 71, ,4 99,2 96,8 94,4 91,9 88,9 81,1 71, (E):Data certificated by EUROVENT (MP):For units equipped with Pumping Module accessory MP-AM or MP-AR. (NB):Regarding unit WITH (600 kpa) or WITHOUT (1000 kpa) Storage Tank accessory. SWL = Sound power levels, with reference to 1x10-12 W. The Total sound power level in db(a) measured in compliance with ISO 9614 standards, is certified according to the Eurovent certification program. Eurovent certification (E) exclusively refers to the Total Sound Power in db(a), which is therefore the only binding acoustic specification (the values of the Octave bands in the table are indicative). SPL = Sound pressure levels, with reference to 2x10-5 Pa. The sound pressure levels are values calculated by applying the ISO-3744 relation (Eurovent 8/1) and refer to a distance of 1 meter away from the external surface of units operating in the open field with directivity factor 2 and the units operating in nominal conditions in the cooling mode.

13 TECHNICAL SPECIFICATIONS AND STANDARD PERFORMANCES - R407C Standard performances AB-7M5 MODEL TW OUTDOOR AIR TEMPERATURE ( C D.B.) kwf kwa kwf kwa kwf kwa kwf kwa kwf kwa kwf kwa , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Tw = Outlet water temperature in C kwf = Net refrigerating power (kw). kwa = Compressor power input (kw). The standard performances refer to a 5 C temperature difference between the water entering and leaving the plate-type heat exchanger and to operation of the unit with all the fans to top speed. A 0.44 x 10-4 m 2 K/W fouling factor has also been considered with the unit installed at zero meters above sea level (Pb = 1013mbar). 13

14 TECHNICAL SPECIFICATIONS AND STANDARD PERFORMANCES - R407C Technical specifications of unit AS-7M5 Model UM Net cooling capacity (1) kw Net total power input (1) kw Maximum pressure on wet side (NB) 600 / 1000 kpa Gross cooling capacity (1)(E) kw Gross total power input (1)(E) kw Compressor specifications Type SCROLL Quantity 4 N N Throttling steps 4 N Oil charge Circuit 1 (1a+1b) l Circuit 2 (2a+2b) l Power input kw Plate-type heat exchanger specifications Quantity 1 N Water capacity l Water flow rate (1) l/s Water pressure drop (E) kpa Specifications of coils with extended surfaces Number of coils 4 N Total area 11.6 m 2 Fan specifications Number of fans 4 6 N Diameter [ ] 800 mm Maximum speed 650 rpm Total air flow rate (2) l/s Motor rating 0.75 kw Water Storage Tank specifications* Water capacity 700 l * : The water storage tank is an accessory that must be requested when the unit is ordered. Pumping Module accessory specifications Model UM Pump power rating kw Surge chamber volume 24 l Service charge pressure of surge chamber 150 kpa Water flow rate (1) l/s Working head MP) kpa Electrical specifications (3)(MP) Power supply 400/3+N/50 V/ph/Hz Total maximum power input [ FLA ] A Total maximum power input [ FLI ] kw Total maximum surge current [ MIC] A NOTES: (1): The data refer to: Water temperature: inlet: 12 C - outlet: 7 C. Outdoor air temperature 35 C D.B. (2): At fan s top speed (3):At maximum tolerated operating conditions Noise levels (E) Mod. SWL (db) SPL Octave bands (Hz) Totale (dba) db db(a) ,4 87,0 84,8 80,3 77,4 73,8 65,3 56, ,4 87,0 84,8 80,3 77,4 73,8 65,3 56, ,4 88,0 85,8 81,3 78,4 74,8 66,3 57, ,4 89,0 86,8 82,3 79,4 75,8 67,3 58, ,4 89,0 86,8 82,3 79,4 75,8 67,3 58, ,4 90,0 87,8 83,3 80,4 76,8 68,3 59, ,4 93,0 90,8 86,3 83,4 79,8 71,3 62, ,40 93,00 90,80 86,30 83,40 79,80 71,30 62, (E):Data certificated by EUROVENT (MP):For units equipped with Pumping Module accessory MP-AM or MP-AR. (NB):Regarding unit WITH (600 kpa) or WITHOUT (1000 kpa) Storage Tank accessory. SWL = Sound power levels, with reference to 1x10-12 W. The Total sound power level in db(a) measured in compliance with ISO 9614 standards, is certified according to the Eurovent certification program. Eurovent certification (E) exclusively refers to the Total Sound Power in db(a), which is therefore the only binding acoustic specification (the values of the Octave bands in the table are indicative). SPL = Sound pressure levels, with reference to 2x10-5 Pa. The sound pressure levels are values calculated by applying the ISO-3744 relation (Eurovent 8/1) and refer to a distance of 1 meter away from the external surface of units operating in the open field with directivity factor 2 and the units operating in nominal conditions in the cooling mode.

15 TECHNICAL SPECIFICATIONS AND STANDARD PERFORMANCES - R407C Standard performances AS-7M5 MODEL OUTDOOR AIR TEMPERATURE ( C D.B.) TW kwf kwa kwf kwa kwf kwa kwf kwa kwf kwa kwf kwa , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Tw = Outlet water temperature in C kwf = Net refrigerating power (kw). kwa = Compressor power input (kw). The standard performances refer to a 5 C temperature difference between the water entering and leaving the plate-type heat exchanger and to operation of the unit with all the fans to top speed. A 0.44 x 10-4 m 2 K/W fouling factor has also been considered with the unit installed at zero meters above sea level (Pb = 1013mbar). 15

16 OPERATING RANGE Operating range The graphs below give the operating ranges within which correct operation of the units is guaranteed. The use of the units in conditions differing from those indicated will void the warranty with which the product is supplied. In the following table, there are the thermal water head limit values of the unit. Thermal Water Head Limit value Minimun C 3 Maximus C 8 COOLING MODE 12 [ C] OUTLET WATER TEMPERATURE Water ΔT= 5 C In these applications, it s advisable to use brine. [ C B.S.] OUTDOOR AIR TEMPERATURE 16

17 HOW TO SELECT THE UNIT 1) The Standard Performances tables in the Technical data and standard performances chapter give the useful refrigerating output capacity values with the relative compressor input power values of the individual units in standard conditions, for each unit and for different outdoor air and outlet water temperature values. The data can be interpolated but not extrapolated. 2) The Technical data and standard performances tables in this technical handbook refer to use of R407C refrigerant, as shown by the titles in the reference section and depending on the unit in question. 3) The tables under the Standard Performances values give the operating temperature limits of the outdoor air that may enter the condenser. 4) The power input values in the Standard Performances tables refer to the compressors alone. Consult the Technical data of the unit tables for the power input of the fans at their top rate. 5) The Standard Performances values refer to 5 C of Δt of the water between the inlet and outlet of the evaporator. Use corrective factor F cd in Tab.3 for different values. To ensure the heat exchanger-evaporator operates in the correct way, comply with the limits to use given in the Loss of head and Useful head sections. 6) The Standard performances values are based on a 0.44* x10-4 m 2 C / W fouling factor of the heat exchanger on the wet side. Use correction factor F cp indicated in Tab. 1 for different values. 7) The Standard Performances values refer to a unit installed in places at zero meters above sea level (Pb = 1013 mbar). Use Performances correction factor F ch indicated in Tab. 2 for operation at different altitudes. 8) Consult the Loss of head section to determine the loss of head on the wet side through the unit. If the units are equipped with the Pumping Module accessory with storage on the water supply plant delivery, or storage pre-engineered for the primary or secondary circuit, the useful head of the unit can be determined by means of the diagram in the Useful head section. Remember that the curves refer to the useful head calculated as difference between the pump head and the loss of head of the components (filter, on-off devices, pipes, tank, plate type heat exchanger) installed in the hydraulic circuit of the unit. 10)Use the Noise levels tables to check the acoustics. 11)If a unit equipped with one of the Pumping Module accessories is being evaluated, check in the Maximum volume of water section to make sure that the capacity of the surge chamber supplied with the accessory suits the volume of water actually in the system being supplied. Example of how the unit is selected: Selection of a unit able to supply an 160 kw refrigerating power in the following conditions: - Outdoor air temperature = 35 C - Temperature of the cold water outlet by the machine = 6 C - Inlet/outlet temperature difference of the water Δt = 6 C Also consider: - a 0.88x10-4m 2 C/W fouling factor on the wet side of the heat exchanger - unit installed in a place at 300 meters a.s.l. The unit must also guarantee a sound pressure level of less than 68 db(a) measured one meter away from the machine. Solution: In view of the maximum sound level value, the choice will be directed towards soundproofed units of the silenced type. Beginning with the refrigerating power required at the given conditions of use and having checked the Standard Performances table, model IR 180 VB AS7M5 can be selected as it provides a standard refrigerating power of 168 kw and a sound pressure level of 65 db(a) one meter away from the machine. The effective refrigerating power provided by the machine in the real conditions of use will be: Pf = Pfs Fc H Fc Where: P f = refrigerating power provided in the real operating conditions (kw) P f s = refrigerating power provided in standard conditions (kw) F CH = correction factor for the height above sea level F CP = correction factor for the fouling factor F CD = correction factor for the temperature difference The available data and tables 1, 2, 3 can be used to determine the values of correction factors F CH = 0.99,F CP = 0.98 F CD = 1.012, after which the refrigerating power supplied in the real operating conditions can be calculated, i.e.: Pf = (168) (0.99) (0.98) (1.012) =165 kw In the given conditions of use, the selected unit provides a 165 kw refrigerating power, which meets the cooling requirements. The flow rate of the water that passes through the evaporator will be: Pf 165 Q = = = 7.88 c Δt D Fc p l/s 17

18 HOW TO SELECT THE UNIT with c = kj/kg C specific heat of the water. A 38 kpa loss of head is given in the Loss of head graph, on a level with the determined water flow rate of the selected model. This value is acceptable since it is within the limit values given in Limits to use. A 172 kpa useful head is given in the Useful head graph, on a level with the determined water flow rate and the curve of the selected model. With reference to the Maximum water volume section drawing and supposing that the difference in level between the highest point in the circuit and the unit is 20 meters (case B of table 5), the chamber must be given a 226 kpa setting while the maximum amount of water in the system (including the volume of the tank of the pumping module) will be 1732 liters (V max ). If the real volume of water in the system is less than 1732 liters, there will be no need to install an additional surge chamber. On the other hand, if the volume is greater, proceed as described below to size an additional surge chamber: Volume of the system (V i ) = 2000 liters ΔV = V i - V max = 268 liters E C = P i (Surge chamber service charge) = (H / ) x 100 = 226 kpa (326 kpa absolute) P f (Fixed value) = 700 kpa (absolute value) Volume of additional surge chamber = (E x ΔV) / (1 - P i / P f ) = (0.0074)(268)/(1-326/700) = 3.71 Liters An additional surge chamber with a capacity of more than 3.71 liters and a 226 kpa setting must therefore be installed. NOTE: If brine is added to the water, the final checks must be made considering the correction due to the percentage of brine used. The correct value of the additional surge chamber to be installed in the system is found with reference to the Correction factors for the total volume of the system with brine table in the Maximum Volume of Water section. Considering the above example again, supposing that 30% brine is to be used: the corresponding correction value for this percentage of brine used in the cooling mode is 0.652, with reference to the Correction factors for the total volume of the system with brine table. The maximum amount of water in the system with brine added is as follows: V max,g = V max x = 1732 x = 1129 liters ΔV G = Vi - V max,g = =871 liters E G = Thermal expansion E /0.652= /0.652= Thus, the volume of the surge chamber must be: (E G x ΔV G ) / (1-Pi/Pf) = (0,0113 x 871) / (1-326/700)= 18.5 liters An additional surge chamber with a capacity of more than 18.5 liters and a 226 kpa setting must therefore be installed. 18

19 HOW TO SELECT THE UNIT Tab.1 Correction factor F cp Fs (m 2 C/W) Fc - P Clean x x x FS = Fouling factor Fc - P = Refrigerating power correction factor Tab.2 Aslm (m) Sea level Correction factor F ch Pb (mbar) Aslm = Height above sea level Pb = Barometric pressure Fc - H = Refrigerating power correction factor Fc - H Tab.3 Correction factor F cd ΔT ( C) FC- D DT = Thermal gradient Fc - D = Refrigerating power correction factor If the system is not drained during winter, but is stopped and brine is used, it will be necessary to introduce multiplicative correction factors for the Refrigerating Power (F CPG ) and Water Flow Rate (F CQG ). Table 4 also gives the reference multiplication factors for the Compressor power input and Loss of head values. Supposing that brine with 30% ethylene glycol is used, the Refrigerating Power, Water Flow Rate and Loss of Head values previously found for the selected unit become: P* f = P f (F CPG ) = (165) (0.97) = 160 kw Q*= Q (F CQG ) = (7.88) (1.12) = 8.83 l/s Loss of Head = (38)(1.25) = 48 kpa Tab.4 % of brine in weight Freezing temperature Refrigerating power multiplier (FCPG) Power input multiplier Water flow rate multiplier (FCQG) Loss of head multiplier % % % %

20 WATER PRESSURE DROP The graph below illustrates the loss of head values in kpa depending on the flow rate in liters/second. The operating range is delimited by the minimum and maximum values given in the next table Water pressure drop (kpa) Water flow rate (l/s) Limits to operation Model UM NOTES Graph reference Q=Water flow rate Lower limit value Q l\s Δp 10 kpa Δp=Loss of head Upper limit value Q l\s Δp 150 kpa Maximum operating pressure on wet side 600 kpa 20

21 WORKING HEAD The graph below illustrates the useful head values (kpa) depending on the flow rate in (liters/second). The operating range is delimited by the minimum and maximum values given in the next table. Useful head is the one at the outlet of the standard pumping module minus all the loss of head values of the unit Working head (kpa) ,0 6,0 8,0 10,0 12,0 14,0 16,0 18,0 20,0 22,0 24,0 Water flow rate (l/s) Limits to operation Model UM NOTES Graph reference Q=Water flow rate Upper limit value Q l\s 21

22 MAXIMUM VOLUME OF WATER Maximum volume of water in the system with wet module Before filling the water system, it is advisable to consider the type of installation in question, i.e. check the difference in level between the wet module and user. The following table gives the maximum water content of the water supply system in liters, depending on the capacity of the standard surge chamber supplied and the pressure at which it should be charged. The surge chamber setting must be regulated to suit the maximum positive difference in level of the user. Maximum setting value 600 kpa. With a positive H of more than meters, calculate the surge chamber s service charge value in kpa using the formula below: Surge chamber service charge= [H/ ] x100 = [kpa] NOTE. In case A, make sure that the user s lowest point is able to withstand the global pressure. Tab.1 Model Surge chamber volume (liters) 24 Thermal expansion of water (10-40 C) H (metri) Surge chamber pressure (kpa) Maximum total volume of water supply system (liters) Case A H <0 150 (standard) < H < (standard) Case B NOTE: If the unit operates with brine, calculate the real volume of the system by taking into account the corrective factors for the volume of the system given in the table below. Corrective factors per total maximum volume of the system with brine % of brine 0% 10% 20% 30% 40% Cooling Mode Heating Mode CASE B U CASE A U U= User 22