Purestream CWT User and Maintenance Manual
Contents
1. co AAAA AA AAA DMS0435 MR ICA E AAA oe ee A A A PEF rre Tint Pim om mt ot tint imp tim mim rewroo7 52 6 264 14 sa2 18 106 20 150 49 Pre TF oe os 463 4 39 2 18 ree rrr ae 06 474 14 302 18 ioe 20 150 49 vee rer ae os 573 vvVVVVVVVY AAAAAAAAA DMS0436 al E ERRE RRA RARA AA 0 0 0 a al al o REP PRE aaa aaa al mp PEE Pre ae 06 564 rewro20 56 1 264 1 4 474 18 108 18 199 ver ver oe 06 eo PEE Pre ae os 661 fewros0 561 264 14 474 18 10 8 18 199 ver ver oe oe 683 38 Purestream CWT User and Maintenence Manual doc July 2013 13 OUT A vvvvvvvvye y AAAAAAAAAA B E D _G ale l c ole F G H WN OUT Drain PG Weight A tr rt emmy meg o A A rm gl rewrose 1535 750 35 1692 45 375 60 650 Terr mer ae er 400 rewroao 1535 750 35 1692 as 375 60 eso marr irr ae 21 410 rewroas 1705 835 35 1852 45 450 60 oso r1 FE Te FF ae 29 400 rewross 1705 s35 as 1es2 45 450 60 eso rw Fe irr ae 29 500 cwroe5s 1705 e35 as 1852 45 aso 60 e50 rv FE ree a 29 515 im tt ot im Pim om om tm o 3 18 148 24 256 THE were ae os ez rewroao 604 295 14 643 18 148 24 256 t FE FF ae 08 904 AAAAAAAAA2. PURESTREAM CWT CHILLERS Y BY FRIULAIR BY FRIULAIR BE2IBEWW CML CHITTEB2 USER AND MAINTENANCE MANUAL Air cooled liquid chillers R410A refrigerant Cooling capacity 2 1 32 2 Tons scroll and rotary compressors 60 Hz Purestream CWT User and Maintenence Manual doc July 2013 Dear Customer Thank you for the trust you have placed in us Please read this manual carefully to obtain the best performance from our product In order to avoid incorrect operating conditions and danger for the operators it is essential that you follow the directions meticulously as well as the current accident prevention laws in the country of use Each CWT chiller is rigorously tested before being packed This verifies that there are no manufacturing defects and that the machine performs correctly the functions for which it was designed This manual must be kept for future reference and is an integral part of the chiller you have purchased Due to continuous technical development we reserve the right to make the necessary modifications without any obligation to give advance notice Do not hesitate to contact us if you have any problems or need more information The product identification plate located on the side of the chiller contains all essential information about the machine During installation fill in the table below copying the data on the identification plate You will have to give this data to the manufacturer
3. The CWT unit can be installed either inside or outside To determine the best place to install the unit it is important to consider the following aspects e the dimensions and source of the water pipes e the location of the electricity e the solidity of the support surface e avoid any obstacles to the flow of the fan which could cause the recirculation of air to the condenser avoid the possible reflection of sound waves do not install in narrow or tight spaces e provide access for maintenance or repair see paragraph 3 3 1 Installation spaces e The air temperatures in the area selected for installation see Chapter 7 0 Operating Limits e Attention if the machine is installed outside it could find itself at a temperature lower than 0 C 32 F when stopped the formation of ice could damage the evaporator If you do not intend to drain the machine during the winter you must add anti freeze to the water circuit see paragraph 3 4 2 Use of ethylene glycol as a winter anti freeze 12 Purestream CWT User and Maintenence Manual doc July 2013 3 3 1 Installation spaces To ensure the good functioning of the unit and access for maintenance you must respect the minimum installation space shown in the figure in this paragraph The exit of air from the fans must not be obstructed In any case avoid all situations in which hot air can circulate between the output of the fans and the intake of the machine Contact
4. button go the PAR menu Press ENTER In the PAR GEN menu press ENTER Use the DOWN arrow to scroll to the GEN SER menu and press ENTER the current serial address is displayed From the SER menu press ENTER the current value will flash Use the UPT and DOWN arrows to set the desired value To return to the main screen press X ESC four times 22 Purestream CWT User and Maintenence Manual doc July 2013 5 8 Display of inputs and outputs It is possible to display the analogue and digital outputs to check the operation of the machine and its main components From the main screen press ENTER Use the DOWN button to move to the I O menu From here press ENTER to access the I O lOd menu Press ENTER and using the UPT and DOWN buttons you can display all the values of the analogue and digital inputs and outputs Press X ESC again until you return to the main screen The following values can be displayed Al 1 analogue input 1 Temperature at the entrance of the machine Al 2 analogue input 2 Temperature at the exit of the machine Al 3 analogue input 3 Notused SE O Al 4 analogue input 4 Pressure of condenser circuit 1 Al 11 analogue input 11 Pressure of condenser circuit 2 Bar g only for models 75 130 DI 1 digital input 1 Chiller on off from run stop switch I O REM O on 1 off DI 2 digital input 2 High pressure pressure switch circuit 1 DI 3 digital input 3 Low pressure pressure switch
5. Alarm icon 8 turns on to indicate an alarm To display the code of the alarm that intervened press the X ESC button use the UPT and DOWN buttons to display the codes of any other alarms that intervened at the same time To reset an alarm the condition that caused it must no longer exist for example if the low pressure pressure switch has intervened the alarm can only be reset when the pressure has risen beyond the reset value see paragraph 6 1 Calibrating security devices and type of rearm Then after displaying the alarm wait for normal conditions to be restored press X ESC again hold it down for 5 seconds and the alarm will be reset 24 Purestream CWT User and Maintenence Manual doc July 2013 5 11 2 Table of alarm codes rinde Alarm description O ews owr 759130 peores Pump magnetothermic circuit breaker water level Manual a comia retecion nn Low refrigerant pressure circuit 2 Magnetothermic compressor circuit breaker and or Manual TA e A09 High exiting water temperature warning Magnetothermic compressor circuit breaker circuit 1 A02 Phase sequence alarm Automatic PI High refrigerant pressure circuit 2 C A03 AP1 AHO ALO ACO A71 A72 A74 A09 AE1 A03 AP1 AH1 AL1 AH2 AL2 A02 AC1 AC2 A71 A72 A74 A75 A09 AE1 6 0 SAFETY DEVICES CWT chillers have a series of safety devices that limit the machine s temperature and pressure values to ensure that it operates within th
6. UP T and DOWN buttons to set the desired value To confirm it press ENTER To exit without saving it press X ESC Press X ESC again until you return to the main screen 5 6 Changing the type of restart after a power failure In the case of a power failure the chiller can behave in three different ways when power is restored e stay off e start e return to the same condition it was in when the power failed To select one of these options proceed as follows From the main screen press ENTER Use the DOWN to go to the PAR menu Press ENTER Go to the PAR GEN menu Press ENTER In the GEN STU menu press ENTER In the YO2 menu the type of restart currently set will be displayed which can be one of the following e EQUA when the power returns the machine will work in the same way as before the power failed e ON when the power returns the machine will start e OFF when the power returns the machine will stay off To change the type of restart press ENTER and the parameter begins to flash Use the UPT and DOWN buttons to select the desired parameter and confirms with ENTER To return to the main screen press XESC four times 5 7 Changing the serial address MODBUS and CAN If you are installing a serial network with several devices it may be necessary to change the serial address of the electronic controller which is set to 1 at the factory From main screen press ENTER Using the DOWN
7. also maintains a low level of noise with respect to its nominal operating conditions 2 5 Control of the water temperature The purpose of the chiller is to maintain the temperature of the water produced within a desired interval as the load on the system varies this is handled by an electronic controller and a temperature probe that turn the compressors on and off appropriately also see paragraph 5 3 Water temperature dead zone regulation 2 6 Protecting the integrity of the machine In addition to controlling the temperature the electronic controller uses pressure switches thermostats and timers to prevent and handle situations that could compromise the integrity of the machine also see Chapter 6 0 Safety Devices Purestream CWT User and Maintenence Manual doc July 2013 2 7 CWT units identification of the main components ESP0349 Compressor Thermostatic valve Pump Liquid peep hole Refrigerant filter Purestream CWT User and Maintenence Manual doc July 2013 21 22 23 ESP0348 Water safety valve Water Filter Water taps Lifting holes Water bypass 25 Water manometer gt O 10 Purestream CWT User and Maintenence Manual doc July 2013 3 0 INSTALLATION 3 1 Transport The units are supplied packed in a cardboard box on a wooden pallet After checking that the packing is undamaged position the unit near the installation site and unpack it A Always kee
8. exchanger An automatic vent valve removes any air bubbles in the circuit A fine mesh metal filter at the entrance to the machine catches any solid residues that could damage the evaporator A calibrated bypass pipe between the output of the pump and the return to the system ensures the minimum flow capacity for the pump even when the system does not need water The unit can be equipped with pumps with different heads see systems with pumps P3 or P5 A manometer and safety valve complete the unit s water circuit Purestream CWT User and Maintenence Manual doc July 2013 2 3 Fans The fans force air through the condenser s fins to remove the heat from the condensation of the refrigerant gas thus limiting the pressure inside the condenser CWT chillers use external rotor axial fans with thermal protection inside the motor winding 2 4 Condensation control When the temperature of the surrounding air drops the cooling capacity of the air flow is significantly increased causing the pressure inside the condenser to drop in order to keep this drop of the condensation pressure from falling below the tolerable limit for the good functioning of the chilling circuit the fans slow their rotation reducing the flow of air The speed is controlled by an electronic regulator based on the condensation pressure this allows the machine to operate properly even when the temperature of the outside air is very low see Chapter 7 0 Operating Limits and
9. hazards O use requires conforming to the installation conditions and in particular e power voltage and frequency e pressure temperature and flow capacity of the incoming water e surrounding temperature The chiller has been tested and completely assembled The user must only make the connections to other systems as described in the chapters that follow 1 4 Instructions for using equipment under pressure conforming to PED Directive 97 23 EC The proper use of equipment under pressure Is an essential prerequisite for ensuring safety To this end the user must proceed as follows Use the equipment properly within the temperature limits shown in the operating limits stated on the manufacturer s name data plate Do not solder on the exchangers or refrigerant fluid pipes Do not install the equipment in insufficiently ventilated rooms areas exposed to sources of heat or near inflammable substances During operation the equipment must not be subjected to vibrations that could cause fatigue failures Keep the documentation attached to the equipment user manual declaration of conformity etc for future reference The maximum working pressure stated on the manufacturer s data plate must not be exceeded Prior to use the user must fit safety pressure relief devices Purestream CWT User and Maintenence Manual doc July 2013 2 0 OPERATION AND MAIN COMPONENTS 2 1 Chilling circuit CWT chillers use a vapour compression cy
10. hear a click it is not High pressure pressure switch rearmed D then rearm the electronic controller press X ESC once alarm code AH1 or AH2 is displayed Then press it again and hold it down for at least 5 seconds Attention the high pressure switch stops the compressors while it keeps the condenser fans running to lower the pressure in the condensers LGT0038 26 Purestream CWT User and Maintenence Manual doc July 2013 7 0 OPERATING LIMITS CWT series units feature broad operating limits in relation to the temperature of the outside air thanks to the condensation control also see paragraph 2 4 they are also prepared to produce water at low temperature in this case it is necessary to contact our company see paragraph 7 1 Negative water temperatures The graphs show the continuous operating limits of CWT units in relation to the temperature of the water exiting the machine Tw out C F and the temperature of the outside air Ta C F Ta C Tw out C Tw out F Attention the dotted line indicates the need to use an ethylene glycol mixture and set adequate parameters in the electronic controller see paragraph 7 1 27 Purestream CWT User and Maintenence Manual doc July 2013 7 1 Low water temperatures lt 32 F If it was not anticipated that the chiller unit offered was to produce water at temperatures close to 0 C 32 F or below y
11. of the main Electronic Close the contacts not start differential switch are open controller off User Unit s electrical panel cut off Electronic Close the contacts User switch are open controller off fa switch in the O or Electronic Move the switch to a ea position controller on No consent from the water A03 Check the functioning aa differential switch of the pump vent the system Compressor timer active The compressor Wait 3 minutes User icon on the display of the electronic controller is flashing No consent from the service System water at Apply a thermal load to User thermostat temperature see the machine or lower display A the set point No consent from the anti AE1 Reset a temperature of User freeze thermostat the water set point compatible with the calibration of the anti freeze thermostat see table in paragraph 7 1 2 Service and anti freeze probe A72 Check contacts and Specialised defective replace if necessary personnel Entering water temperature Check contacts and probe defective replace if necessary Intervention of the main Electronic Look for current differential switch controller off leakage inside the machine Specialised personnel Specialised personnel 30 Purestream CWT User and Maintenence Manual doc July 2013 a B The compressor doesn t start Intervention of the high pressure pressure switch Possible cause Intervention of the thermal protectio
12. our office to verify feasibility in all cases where one of the preceding conditions cannot be met LGT0031 Po Model A CWT 7 15 0 8 m 32 inches access for maintenance CWT 18 130 1 5 m 60 inches 3 4 Water connections Connect the machine to the water pipes following the instructions located near its water fittings see figures Water input to the machine Water exit from the machine Use the input and output taps provided with the machine they allow the machine s maintenance without emptying the entire system or emptying the machine during the winter A Important Install the mechanical water filter provided with the machine on its input scum and impurities can seriously damage the evaporator 13 Purestream CWT User and Maintenence Manual doc July 2013 Diameters of the water fittings a CWT models 007 030 038 065 075 130 Diameter of the in out water i a a NOTE Itis a good rule that the diameters of the arriving and sa departing pipes be not less than the water fittings jas e ar NX We recommend an extraordinary cleaning of the l S E mechanical water filter after the machine has been running for x the first week also see Chapter 8 0 Maintenance and Q periodic inspections 3 4 1 Recommended water system The standard equipment provided with CWT units includes tank pump expansion vessel safety valve filter shut off taps and automatic vent valve however we recommend
13. that the water circuit also be equipped with e amechanical filter and a check valve upstream from the charging tap an air vent at the highest point of the system a drain tap in the lowest point of the system manometers and thermometers at the machine s water input and output to check its functioning vibration damping joints on the pipes to avoid the transmission of vibration to the system In the case of water circuits with considerable capacity we recommend checking whether it is necessary to supplement the expansion vessel already on the unit with another additional one Diagram of the recommended water circuit a A A a a a A B Knob 2 Mechanical filter 8 Filingunit 6 Thermometer SCE B Components supplied by the installer 14 Purestream CWT User and Maintenence Manual doc July 2013 Attention Never work with an open flame near or inside the unit when making connections to the water system Important If the machine is stopped during the winter you must empty the system or just the chiller to avoid frost damage any water remaining in the pump must be drained using the screw on the lower part of the pump housing see figure Pump drain screw LGT0033 3 4 2 Use of ethylene glycol as a winter anti freeze Instead of emptying the system in the winter you can charge the system with a mixture of water and a Suitable percentage of ethylene glycol chosen a
14. EDRAWIN OS coria 38 4 Purestream CWT User and Maintenence Manual doc July 2013 1 0 Safety rules 1 1 Definitions of the symbols used Read this use and maintenance manual carefully before performing any repairs on the chiller Warnings of a general character risk of danger or possibility of damaging the machine pay particular attention to the phrase following this symbol Risk of electrical danger the phrase highlights conditions that could be fatal Follow the instructions provided meticulously Risk of danger component or system under pressure Risk of danger component or system that can reach high temperatures during operation Risk of danger it is absolutely forbidden to use water to extinguish fires near or on the chiller Risk of danger it is absolutely forbidden to operate the machine with the panel open Service that can be performed by the machine s operator if qualified 1 Water input connection point Water output connection point Dispose of each type of material in accordance with the requirements of the country of use NOTES Phrases to be emphasized that do not contain safety rules This chiller has been carefully designed and constructed to be environmentally friendly e Refrigerants without CFC e Expanded foam insulation without CFC e Energy saving techniques e Reduced noise e The chiller and its packing materials are recyclable In order not to hinder our efforts the user is
15. P fram mam rm mae rm mam rom imn mm g CwTo7z5 1900 1110 35 2025 45 495 60 600 2FF 2FF ser 36 720 CwTo90 1900 1110 35 2025 45 495 60 600 2FF 2FF se 36 770 fewr110 ate0 1215 35 2230 45 545 00 ooo 2 FF 2 FF ae 36 980 fewr1s0 2180 1215 95 2230 45 s45 00 600 ere ere ae 96 1000 m m n jaja jaja TT mim 39 Purestream CWT User and Maintenence Manual doc July 2013 13 PURESTREAM e CWT CHILLERS BY FRIULAIR CAG PURIFICATION INC 3770B Laird Road Unit 2 Mississauga Ontario L5L 0A7 Toll 1 800 951 0777 Fax 1 905 820 3490 info chillers cagpurification com web www cagpurification com Purestream CWT User and Maintenence Manual doc July 2013 13 Purestream CWT User and Maintenence Manual doc July 2013 41
16. ch see paragraph 6 1 Rearming the high pressure pressure switch To overcome this problem you will have to reduce the thermal load on the machine by shutting off some of the uses or if this is not possible by reducing the flow of water into the evaporator partially close the output tap from the chiller and restart the machine Operate the chiller under these conditions until the water temperature gradually returns within operating limits then you can turn on the tap completely 4 3 Turning off the unit To turn off the chiller hold down the UP 1 3 button on the electronic controller for at least 5 seconds or move the run stop I O REM switch to the O position see paragraph 5 2 Turning on and off A Attention it is important not to turn the unit off using the main power supply switch or the cut off on the machine s electrical panel because this would not provide for the delayed power off of the pump regarding the power off of the compressors with the risk of damaging the evaporator in addition it would prevent the functioning of the heating elements in the compressor housing 18 Purestream CWT User and Maintenence Manual doc July 2013 5 0 ELECTRONIC CONTROLLER D 5 2 x a Q Electronic controller The electronic controller has two 7 segment displays and a series of icons it manages e the functioning of the compressors to ensure that the water produced has a constant temperature e the functioning of the pu
17. circuit 1 0 0K RA Po DI 4 digital input 4 Evaporator flow differential pressure switch 0 0K A A DI 5 digital input 5 Compressor and or phase sequence protection circuit 1 0 0K EN AN DI 6 digital input 6 Water level pump and or fan protection 0 0K IN e rr DI 11 digital input 11 High pressure pressure switch circuit 2 0 0K RATA tenvtormadee5e100 teresa swich intenenion DI 12 digital input 12 Low pressure pressure switch circuit 2 0 0K eS entradas gestao teresa swtohitervenion DI 13 digital input 13 Compressor protection circuit 2 0 0K peee EN tem DI 14 digital input 14 Phase sequence protection circuit 2 0 0K pee lr DO 1 digital output 1 Alarm present O no alarm PO DO 2 digital output 2 Compressor eee Compressors 1 and 2 only for models 90 130 1 on DO 3 digital output 3 Compressor SA Compressor 3 only for models 90 130 1 on DO 4 digital output 4 Compressor O off Pees fem 1 on 1 on DO 11 digital output 11 Compressors 4 and 5 only for models 90 130 1 on DO 12 digital output 12 Compressor 6 only for models 90 130 1 on 23 Purestream CWT User and Maintenence Manual doc July 2013 5 9 Displaying the software release version of the electronic controller From the main screen press ENTER Use the DOWN button to go to the SER menu Press ENTER From the SER INF menu press ENTER and here you can display the version of the software release installed in your controller P
18. cle in a chilling circuit that essentially consists of the following components evaporator compressor condenser and thermostatic expansion valve Evaporator this is a braise welded plate exchanger that exchanges heat between water and a refrigerant fluid without their coming into contact with each other It consists of corrugated stainless steel plates braise welded to each other with copper The evaporator is protected against a lack of water by a differential pressure switch and against the formation of ice by an anti freeze system managed by the chiller s electronic controller Compressor this compresses the vapours coming from the evaporator and sends them to the condenser at a higher pressure CWT chillers use rotary models 7 and 10 and scroll compressors they feature a low level of vibration and noise they are protected by magnetothermic circuit breakers and a temperature sensor in the motor winding Condenser this is a micro channel exchanger made entirely of aluminium that exchanges heat between the refrigerant and the air it condenses the refrigerant gas which flows inside the micro channel transferring its condensation heat to the air which flows outside this produces refrigerant liquid under high pressure Thermostatic expansion valve this reduces the pressure of the refrigerant liquid coming from the condenser and sends it to the evaporator This valve modulates the flow of refrigerant in such a way as to maintain the cons
19. compressor from stopping and starting too frequently at least 3 minutes must elapse between one compressor s power up and the next Anti freeze thermostat 3 C 37 4 F 6 C 42 8 F ee SO 6 2 Resetting the high pressure pressure switch The intervention of the high pressure pressure switch is the only case in which in addition to manually rearming the electronic controller it is also necessary to reset the pressure switch itself The high pressure pressure switch is located in the compressor compartment on the uninsulated copper pipe that goes from the compressors to the condensation batteries there is a manual rearm button on top of it This can only be rearmed when the pressure in the circuit has fallen below the reset value see table Calibration of the safety devices and type of rearm in paragraph 6 1 For this reason when dealing with an intervention of the E high pressure switch it is necessary to A identify the cause of the rise in pressure fans not working condensation batteries dirty or obstructed obstacles to the flow of exiting air operating temperature outside operating limits etc also see Chapter 9 0 Trouble shooting and remove the cause if possible B wait until the high pressure manometer falls below the reset value see the table Calibration of the safety devices and type of rearm in k paragraph 6 1 _ A C rearm the pressure switch by pressing the red button if you do not
20. ct damage to persons animals and or property that are caused by incorrect use or inadequate maintenance and is exclusively limited to manufacturing defects The right to service under the warranty is secondary to your faultless observance of the installation use and maintenance instructions in this manual The warranty will be voided immediately if the chiller is modified or tampered with even slightly When requesting warranty service you must provide the data on the product s identification plate Purestream CWT User and Maintenence Manual doc July 2013 Contents 1 0 SAIS CY CULES oa 5 dd Detnitons of the MDOISUSC A a cuvins tetany pista teiadahsl Na 5 1 2 Wo Santo cia 6 1 3 Proper use orhe COR a adds 6 1 4 Instructions for using equipment under pressure conforming to PED Directive 97 23 EC 6 2 0 OPERATION AND MAIN COMPONENTG sscccccsssccccessecccseseccccenscceteeseceseeeceeeeeeceesenecesseecetsegecesseees 7 2 1 CRUIN E CFCU IPR o A A 7 2 2 Water clica oa a N aa 7 253 Pd diana T 8 2 4 Condensation Controls a a oo 8 2 5 C ntrol f the Water temperatura nicol laica 8 2 6 Protectine the ldntesritr OP the machine ca lcicos 8 2 7 CWT units identification of the main COMPONENTS cccccncccnnonoconnnonaconnnnnocnnonanonnnnononnnnnncnnnonanonnnnanoss 9 3 0 INSTALLATION tr A ci 11 3 1 Transpor a iaa 11 3 1 1 Handling the unit with a forklift truck or pallet jack ooococoooccnnonancnnnonacononna
21. e electronic controller or other symptom Symptom Possible cause G The unit is Excessive thermal load working without ever stopping H Compressor No refrigerant intake pipe covered with frost High overheating low undercooling and high output temperature of the compressor Traces of oil on the chilling circuit Excessive water flow capacity the pump is absorbing too much current The pump doesn t start Magnetothermic protection of the pump open Short circuit or overcurrent 34 Purestream CWT User and Maintenence Manual doc July 2013 Reduce the thermal Reduce the temperature of the incoming water and or the flow capacity of the water by closing the exit tap of the unit a Specialised personnel Check the chiller circuit with a leak detector Repair any ruptures and recharge the circuit Reduce the flow capacity of the water by closing the output tap of the pump a little bit Rearm the thermomagnetic protection of pump Specialised personnel Look for a short circuit in the winding of the pump motor Check for possible over absorption of current due to too low voltage check the power supply voltage 10 0 DISMANTLING THE CHILLER as the chiller is being dismantled you must separate it into parts of homogeneous material The following table lists the main materials of the various components of the machine Part Materips Refrigerant fluid Panelling and supports Chil
22. e anticipated limits and to avoid dangerous situations Here is a list of dangerous situations including the relative safety device and its location Dangerous situation Safety device Location High condensation pressure High pressure pressure switch Compressor output pipe High condensation pressure High pressure prevention system Electronic controller CWT 25 130 Low water temperature Anti freeze thermostat Water exit from the plate evaporator High water pressure Safety valve Accumulation tank Frequent compressor start ups Anti circulation timer Electronic controller Low water level in the tank Water level sensor 25 Purestream CWT User and Maintenence Manual doc July 2013 When they reach their calibration value most of the security devices trigger an alarm managed by the electronic controller For some safety devices once the cause of the alarm times out the machine resumes operation automatically as soon as the reset value is reached Others must be manually reset to restart the machine also see paragraph 5 11 Alarms The following paragraph lists the characteristics of each safety device 6 1 Calibration of the safety devices and type of rearm e Only active on units with more than one compressor CW T25 130 consists in reducing the number of functioning compressors to 1 until the condensation pressure falls below the reset value again e This is a function of the electronic controller that prevents the same
23. eck the voltage at Specialised Pump icon lit the coil of the personnel contactor of the pump and the continuity of the coil itself 32 Purestream CWT User and Maintenence Manual doc July 2013 Possible alarm signal on the Symptom Possible cause electronic controller or other symptom E Intervention of Refrigerant filter clogged or Pipe downstream Check and replace Specialised the low thermostatic valve stuck from the personnel pressure component pressure covered with frost switch F Fans don t start Very low outside air Fan icon off The machine can work temperatures and Condensation anyway consequent intervention of pressure normal the condensation control No voltage output from the Fan icon on and Check the voltage Specialised fan speed regulator fans stopped output from the personnel regulator and replace if necessary De Intervention of the thermal Check that the working protection inside the fan conditions of the machine outside air temperature are compatible with the operating limits Wait for the fan motor to cool Fan fuse blown Fan icon on and Look for short circuits Specialised fans stopped in the motor windings personnel of the fans Check the resistance to rolling of the fan roller bearings Electrical connections of the Fan icon on and Check and tighten Specialised fans loose fans stopped personnel 33 Purestream CWT User and Maintenence Manual doc July 2013 Possible alarm signal on th
24. ecommended glycol percentages for operating with negative temperatures After selecting the value confirm it by pressing ENTER Exit by pressing X ESC several times until you return to the main screen 7 1 2 Recommended glycol percentages for operating with low water temperatures The table below shows the percentage of glycol required and the setting of the anti freeze alarm for each temperature of water produced Temperature of the water produced set point C 10 7 5 3 o 2 5 Anti freeze alarm setting C Le ee ee es Te Temperature of the water produced set point F Anti freeze alarm setting F Pe ee ee Percentage of ethylene glycol 30 30 30 2 20 15 15 0 AN CWT units can operate with water and ethylene glycol mixtures up to a concentration of 30 28 Purestream CWT User and Maintenence Manual doc July 2013 8 0 MAINTENANCE AND INSPECTIONS AND PERIODIC CHECKS Operation Check that the temperature of the water produced is in the required Daily interval Check for the presence of any alarm signals Daily Check the functioning of the fans Monthly verify that it is about 1 bar 15 psi operating limits of the machine Clean the air filters Monthly Clean the condensation batteries with a jet of compressed air Yearly Clean the water filter Check that the refrigerant liquid peep hole is clear or at most with a few bubbles check with the comp
25. enu navigation scrolls up through the menu items Increases the value of the parameter being modified Scrolls up through the alarm list During menu navigation scrolls down through the menu items Decreases the value of the parameter being modified Scrolls down through the alarm list During the machine s operation shows the temperature of the water exiting the evaporator During navigation of the menu indicates the directory above the one where you are During the machine s operation shows the temperature set point for the water During navigation of the menu indicates the directory where you are When modifying a parameter the value to be modified is displayed flashing 7 COOLING icon Indicates that the machine is ON even when the compressors are stopped COMPRESSOR icons 1 2 3 4 PUMP icon ALARM icon Indicates the presence of one or more active alarms They indicate the state of the compressors and more precisely Off compressor OFF On compressor ON Slow flashing compressor about to turn on Fast flashing compressor about to turn off Indicates the state of the pump more precisely Off pump OFF On pump ON Fast flashing pump about to turn off Indicates the state of the fans On fans ON Off fans OFF Purestream CWT User and Maintenence Manual doc July 2013 5 2 Turning on and off To turn the unit on hold down the UP 1 button 3 for more than five seconds To turn the u
26. essors are are forced off to progressively that are on are are progressively on avoid the turned off as the kept on and turned on as the formation of ice temperature of the those that are off temperature of water decreases are kept off the water increases Numeric examples From 6 C 42 8 F to From 7 C 44 6 F to From 8 C 46 4 F to 7 C 44 6 F 8 C 46 4 F 9 C 48 2 F Above 9 C 48 2 F 3 37 4 F From 9 C 48 2 F to From 10 C 50 F to From 11 C 51 8 F to 10 C 50 F 11 C 51 8 12 C 53 6 F Above 12 C 53 6 F 3 37 4 F The set point of the water can be changed the other parameters differentials and dead zone remain constant and follow the set point value moving on the temperature scale see the numeric examples in the table above 21 Purestream CWT User and Maintenence Manual doc July 2013 5 4 Changing the set point A If during the offer phase you did not specify that the chiller must produce water at temperatures close to 0 C 32 F or below you must contact our company See paragraph 7 1 Low water temperatures To change the set point of the exiting water proceed as follows from the main screen press ENTER use the DOWN button to go to the PAR menu Press ENTER and use the DOWN button to go to the REG menu Press ENTER In the REG SET menu press ENTER and the set point will be displayed To change it press ENTER and the value will flash Use the
27. he machine at least two hours before start up to give the heating The heating elements limit the quantity of refrigerant dissolved in the oil and prevent the oil from migrating when the compressors start Before start up check that the temperature of the lower part of the compressors is at least 10 15 C 18 28 F higher than the surrounding temperature 4 2 Start up To proceed to start up 5 1 Move the remote on off switch I O REM on the door of the electrical to position 1 2 Turn the unit on by holding down the UP 1 button 3 on the electronic controller for five seconds The icon 7 on the display will light up 3 Check that the alarm symbol 8 does not light up on the electronic controller if this should happen press the X ESC button to display the type of alarm triggered 9 qg Y Electronic controller 13 42 17 Purestream CWT User and Maintenence Manual doc July 2013 4 2 1 Attention at the first start up there could be an alarm for an incorrect sequence of the R S T phases indicated by the initials ACO for CWT models 7 65 or A02 for CWT models 75 130 when you press the X ESC button This safety system prevents the compressors from turning in the wrong direction In this case turn on the main power supply switch upstream from the machine and reverse the two phases immediately downstream from the main switch A Attention never reverse the wire
28. ler compressor Plate exchanger evaporator Pipes Fan Aluminium Copper Steel Valves Insulation Synthetic rubber without CFC EPS Polyurethane Electrical wires Copper PVC Electrical parts PVC Copper Bronze We recommend that you follow current safety norms for the disposal of each single material The refrigerant contains particles of lubrication oil from the chiller compressor wes 11 0 WATER DIAGRAMS Dispose of refrigerant properly Remove it from the chiller with suitable tools and deliver it to authorised collection centres that will treat it and make it reusable Ball valve I Drain tap Expansion vessel a Manometer Version with single pump Version with double pump E z Purestream CWT User and Maintenence Manual doc July 2013 12 0 REFRIGERANT CIRCUITS DIAGRAMS Key UC EN CN eE R Check valve C Low pressure pressure switch E E r DGT0018 DGT0017 Refrigerant circuit diagram for CWT models 7 20 Refrigerant circuit diagram for CWT models 25 40 36 Purestream CWT User and Maintenence Manual doc July 2013 9100190 Refrigerant circuit diagram for CWT models 45 65 TS P Refrigerant circuit diagram for CWT models 75 130 37 Purestream CWT User and Maintenence Manual doc July 2013 13 13 0 DIMENSIONAL DRAWINGS
29. mp e the speed of the fans e the prevention of the high pressure alarm CWT 25 130 displays e the state of the unit icon 7 the state of the compressors 4 compressor icons 9 the state of the fans fan icon 11 the state of the pump pump icon 10 the temperature set point display B 5 the temperature of the water produced display A 6 all digital and analogue inputs and outputs parameters navigation through displays A and B displays the following alarms e water differential pressure switch high pressure pressure switch low pressure pressure switch anti freeze thermostat compressor protection wrong R S T phase sequence pump and fan protection water level in tank insufficient pressure and temperature probe failure 19 Purestream CWT User and Maintenence Manual doc July 2013 5 1 Main functions of the electronic controller buttons and meanings of the icons No Button Icon Functions S ENTER X ESC DOWN DISPLAY A DISPLAY B Accesses the menu Goes to the next menu level Goes to the mode for editing the selected parameter Confirms value entered for a parameter Accesses the list of active alarms When navigating the menus returns to the previous menu level pressed once When navigating the menus returns to the main page pressed several times Exits from parameter edit mode without saving the changes made When pressed for at least 5 seconds turns the unit on and off During m
30. n inside the compressor Magnetothermic protection of the compressor open QC1 QC2 etc Intervention of the phase sequence relay Contactor of the compressor open Condenser obstructed or insufficient air flow capacity The unit has operated outside its operating limits such as air or water too hot Purestream CWT User and Maintenence Manual doc July 2013 Possible alarm signal on the electronic controller or other symptom The remote switch of the compressor is on but the compressor is stopped ACO for CWT 7 65 AC1 for CWT 75 130 circuit 1 AC2 for CWT 75 130 circuit 2 ACO for CWT 7 65 A02 for CWT 75 130 The compressor icon is on but the compressor is stopped AHO for CWT 7 65 AH1 for CWT 75 130 circuit 1 AH2 for CWT 75 130 circuit 2 AHO for CWT 7 65 AH1 for CWT 75 130 circuit 1 AH2 for CWT 755130 circuit 2 31 Wait for cooling check that the compressor is working under normal conditions Check for insufficient refrigerant in the circuit Look for short circuits in the motor windings of the compressors Check for possible over absorption of current due to too low voltage combined with operating conditions near the limits check the power supply voltage and operating conditions Reverse the two phases upstream from the cut off switch of the unit s electrical panel see paragraph 4 2 Check the voltage at the coil of the remote switch of
31. nit off hold down the UP 1 button 3 for more than five seconds Optionally once the machine has been turned on using the electronic controller it can be turned on and off from the run stop switch Il O REM on the door of the electrical panel Attention the run stop l O REM switch has precedence over the 1 UP button 3 after turning the machine office from the run stop l O REM switch it will not be possible to restart it with the T UP button 3 on the electronic controller 5 3 Water temperature dead zone regulation The machines have a temperature probe at the exit from the evaporator based on this temperature the electronic controller starts and stops the compressors to keep this temperature as close as possible to the temperature set point The electronic controller regulates the exit temperature of the evaporator using a dead zone system this system is based on three temperature intervals lower differential dead zone upper differential and two temperature values the set point and anti freeze All these values are distributed on the temperature scale as shown in the figure Upper differential 1 C 1 8 F Dead zone 1 C 1 8 F Lower differential 1 C 1 8 F Water temp exiting the evaporator C F point Below this value In this interval the In this interval In this interval All the the compressors compressors are the compressors the compressors compr
32. nncnnnonanonnnnnaconnnnos 22 5 7 Changing the serial address MODBUS and CAN oooccccnncnnncccnnncnnnnccnnnnonanonnnnnonanoconnnonanoconnnonaninnnnos 22 5 8 Display ot INputs and OULD US Script aa a a libelo lbdccsda 23 5 9 Displaying the software release version of the electronic controller occcconncnnnncnnnnannnonininono 24 5 10 Displaying the compressor and PUMP COUNTETS oocccccncccnncnncnnnonnnonnnonaconnnnncnnnonanonnnnnncnnnnnncrnnonanonnos 24 SE AS e 24 SILT Displaying and resetting alas aa 24 SLZ Tapera mM CodeS rta na id 25 6 0 SAFETY DEVICES iio 25 6 1 Calibration of the safety devices and type of rearM occcconccnnccnccnnnnnnconnonanonnnnnncnnnnnncnnnonanonnnonanonnnnns 26 6 2 Resetting the high pressure pressure switch ssssssesessessrresesrerssrresssrrressrersserresrrereserresereesserresene 26 7 0 OPERATING KIMIL cennere a N E A N EA 27 7 1 L w Water temperaturas lt 32 e el aa do 28 7 1 1 Changing the setting of the anti freeze thermostat oocccnconocnnnonanonnnnnncnnnonaronnananonnnnnaronnnnos 28 7 1 2 Recommended glycol percentages for operating with low water temperatures ooo 28 8 0 MAINTENANCE AND INSPECTIONS AND PERIODIC CHECKS occccccnnnccccnccnnnccnnnconnnccnnnnonnnccnnnnonanocnnncnnnarononos 29 9 0 TROUBLESHOOTING 2d 30 10 0 DISMANTLING THE CHILLER ici AA A AA AAA 35 IEO WATER DIAGRAM Siunrr A A tated de 35 12 0 REFRIGERANT CIRCUITS DIAGRAMS ss a 36 13 0 DIMENSIONA
33. nnected to terminals X2 13 and X2 14 of the terminal strip in the electrical panel there are 24V between these two terminals consult the electrical diagram To enable a remote switch move the l O REM switch to REM 3 5 3 Connecting a remote alarm indicator light An alarm indicator light can be connected to terminals X2 16 X2 17 and X2 18 clean contacts of the terminal strip in the electrical panel consult the electrical diagram 4 0 PRELIMINARY CHECKS AND START UP 4 1 Preliminary checks and preparation for the first start up Before starting up the unit it is a good idea to do the following 1 Check that the water shut off valves are open Check that the pressure shown on the manometer with the pumps stopped is at least 1 bar for closed water systems 3 Check that the surrounding temperature is in the range for the machine to function see Chapter 7 0 Operating Limits Check that the cut off on the electrical panel of the machine is open O position Check that the run stop switch I O REM in the electrical panel is in the O position Check that the mains voltage matches the voltage on the machine s identification plate with a tolerance of 10 7 Close the main power supply switch 8 Close the cut off switch on the machine s electrical panel I position os This puts the machine under voltage without starting it up elements in the compressor housing time to heat the oil inside Attention Apply voltage to t
34. or reseller whenever you request information replacement parts etc during the warranty period Removing or tampering with the identification plate will void the warranty Example Fill in this identification plate FRIULAIR ates ERIVLEOIR re JO Car vegran wh pilin mi Chillers TORE ITALY Chillers 39880 Cervo pg Model GCWT7 Model Serial No 110002800 Serial No Code CWTOO7CO1 ROOD nae i Fe eee eee CEEE Nominal Capacity 9 KW Nominal Capacity es T W Refrigerant circuit DN 20 A a a RL PS HP42 LP29bar TS 10 120 PS HP JLP bar TS Water Circuit V 85 0 liter Water Circuit V lifer PS Shar T 10 30 PS bar uo C Electric Electric S 400V 10 50Hz 25 AW h SE 2KWI3 4A FLAT 2A IP 44 sI A FLA A P Diagram 5478000003 ROO MO ec Complete unit Complete unit PED S7 23 EC Art 3 8 Fluid Group 0 PED 97 29 E0 Fluid Group Ambient temperature TS 1 50 C Ambient temperature T Hermetically Sealed Hermetically Sealed Contains fluorinated greenhouse gases Contains fluorinated greenhouse gases covered by the Nyoto Protocol cord the Kyat Proc Warranty conditions For 12 months from the commissioning date and no more than 14 months from the shipping date any parts that were originally defective will be repaired or replaced at no charge Expenses for transport and travel room and board for our technicians are excluded The warranty excludes any liability for direct or indire
35. ou should contact our company To achieve temperatures that are negative or near zero it is necessary to use anti freeze ethylene glycol in percentages that depend on the desired temperature it is also necessary to change the calibration of the anti freeze thermostat NOTE The anti freeze thermostat setting can only be changed at a higher level of programming of the electronic control please request the password by contacting our company 7 1 1 Changing the setting of the anti freeze thermostat Please ask our company for the password for changing the parameters From the main screen press ENTER the word LOG is displayed press ENTER the text PAS 0 is displayed enter the first of the four digits of the password using the UPT and DOWN buttons then press ENTER 7 do the same for the other three digits the word LOG is displayed Use the DOWN button to scroll the menu until the text PAr is displayed press ENTER the text PAr GEN is displayed Use the DOWN button to scroll the menu until the text ALA is displayed press ENTER the text ALA CFG is displayed Use the DOWN button to scroll the menu until the text ALA ICE is displayed press ENTER the text AIS is displayed with the current setting of the anti freeze thermostat alongside the factory setting is 3 0 Press ENTER again and the set value will begin to flash select the recommended value using the UP fand DOWN buttons see table in paragraph 7 1 2 R
36. p the chiller vertical turning it upside down can irreparably damage several parts of the unit A Handle with care Violent falls can cause irreparable damage The units can be handled using tubes and belts or a forklift truck 3 1 1 Handling the unit with a forklift truck or pallet jack A The centre of the machine is approximately its centre of gravity In any case when handling the machine with a forklift truck or pallet jack always check its stability before lifting LGT0037 Purestream CWT User and Maintenence Manual doc July 2013 3 1 2 Lifting with belts and tubes All units have holes in the base to house the lifting tubes Use steel tubes with a diameter of 11 and at least 3 mm 0 11 inch thick and long enough to project at least 250 300 mm 10 12 inch from both sides of the machine s profile A Lock the belts so that they won t slip off during lifting see figure LG 70036 3 2 Storage Protect the machine from bad weather even if packed Always keep the chiller vertical even when in storage Turning it upside down can irreparably damage several parts of the unit If not used the chiller can be stored packed in an enclosed place free of dust with a maximum temperature of 50 C 122 and specific humidity of no higher than 90 The packing material is recyclable Dispose of each type of material in accordance with the requirements in the country of use 3 3 Place of installation
37. required to obey the simple ecological warnings indicated by this symbol 1 These are persons with the experience technical preparation and knowledge of standards and regulations who are qualified to perform the necessary actions and able to recognise and avoid possible dangers while handling installing using and maintaining the machine Purestream CWT User and Maintenence Manual doc July 2013 wel 2 Warnings Only qualified persons may use and maintain electrically powered equipment You must obey the following rules before carrying out maintenance Make sure that no part of the machine is under voltage and that it cannot be reconnected to its power supply These chillers contain R410A refrigerant fluids Service of the chilling circuit must be performed by specialised personnel using satisfactory tools In addition to creating dangerous situations any alterations to the machine or its operating parameters that have not been checked and authorised by the manufacturer in advance will void the warranty te Do not use water to extinguish fires near or on the chiller 1 3 Proper use of the chiller CWT units are monobloc waiter chillers with air condensation They are intended for use in industrial process or air conditioning systems requiring chilled water Any other use is considered improper The manufacturer is not liable for damage resulting from inappropriate use in all cases the user is liable for any resulting
38. ress X ESC again until you return to the main screen 5 10 Displaying the compressor and pump counters From the main screen press ENTER Use the DOWN button to go to the HRS menu Press ENTER In the HRS COH menu press ENTER Use the arrows to display the working hours of the compressors C01 C02 etc To display the working hours of the pump after going to the HRS COH menu use the DOWN button to scroll down to the HRS EPH menu and press ENTER lt From here you can display the working hours of the pump EP1 To exit Press X ESC again until you return to the main screen 5 11 Alarms An alarm condition is signalled by the Alarm icon 8 Some alarms must be rearmed manually while for others the reset is automatic or semi automatic Manual reset these alarms must be reset which can only be done when the alarm condition no longer exists only then can the machine resume operation Automatic reset the alarm is automatically deactivated as soon as the alarm condition ceases and the machine restarts by itself However the signal Alarm icon 8 remains on the display until the alarm code is displayed Semi automatic reset semi automatic alarms behave like automatic alarms but if the same semi automatic alarm occurs 5 times in 90 minutes that alarm becomes a manual alarm therefore to restart the machine you will have to remove the cause of the alarm and reset it 5 11 1 Displaying and resetting alarms The
39. ressor running Check that the undercooling and superheating values are Every 6 months respectively between 3 5K 5 4 9 F and 5 7K 9 12 6 F Specialised Check for traces of oil on the pipes of the chilling circuit symptom personnel of refrigerant leaks Y electrical panel and on the terminal strips of the compressors deterioration replace them values on the identification plate If the unit will not be used for a long time drain the water from the Extraordinary User pipes and the machine to avoid the formation of ice during the winter 1 It may be necessary to carry this out more frequently in the case of particularly dirty environments 2 We recommend an extraordinary cleaning of the filter after the machine has been operating for the first week 3 It is not necessary to do this if the system has been charged with an anti freeze solution water and a suitable percentage of glycol see paragraph 3 4 2 Use of ethylene glycol as a winter anti freeze Attention Before carrying out any maintenance on the unit or accessing internal parts make sure you have cut off the electricity Attention The upper part of the compressor housing and the output pipe are hot Be especially careful when working near them 29 Purestream CWT User and Maintenence Manual doc July 2013 9 0 TROUBLESHOOTING Possible alarm signal on the Symptom Possible cause electronic controller or other symptom A The unit does Contacts
40. ronnnnanonnos 11 3 1 2 Hne with bets MA LOIS cur id 12 3 2 SO ds 12 3 3 ER seit setae sacle ea tiade E E E E erate coat E E A 12 3 3 1 Stalin SDC OS isnt eel dee 13 3 4 Water COMME CHOI estat icscstivente cate a E te bate N cw tan dca ate tee tsnncaiMeuaed cui lcetacienvedentontss 13 3 4 1 Recommended Water St Misa A aia A 14 3 4 2 Use of ethylene glycol as a winter antifreeze ccccooocccncnnncnnnnnnonononaconnonanonnonanonnnonaronnonanonnos 15 3 4 2 Chareine the Water cnc ee 15 3 5 Electrical connections a o eee ce did 16 3 5 2 Connecting a TEMOLEION ONS With da 17 3 5 3 Connecting a remote alarm indicator light oooonccnconocnnnonannnnonanonnnonaronnnnaronnnnancnnnnonoss 17 4 0 PRELIMINARY CHECKS AND START UP canica asa 17 4 1 Preliminary checks and preparation for the first Start Up cccoocccnconocnnnnnnncnnonanonnnonaronnnnncnnnonanonoos 17 4 2 A O cens ea anos grsclo ncaa A A E 17 3 Purestream CWT User and Maintenence Manual doc July 2013 4 2 1 Start up nder Critical conditons usara 18 4 3 TUNE Orn AE UN ene aa A 18 5 0 ELECTRONIC CONTROLLER o E nds 19 5 1 Main functions of the electronic controller buttons and meanings of the ICONS 20 5 2 MUCH ONO starts 21 5 3 Water temperature dead zone regulation ii avi dtusaliaeenebene adaceeieans derek 21 5 4 Chaneine Neset DO NE eran senses face A A NE 22 5 6 Changing the type of restart after a power failure ccccoocccnconaccnnonanonnnnnncnnnn
41. s a function of the lowest expected temperature of the outside air Percentages of ethylene glycol recommended as a function of the expected temperature of the outside air Outside air temperature C 0 5 210 12 15 Outside air temperature F 10 2 Percentage of ethylene glycol A Attention Maximum concentration of ethylene glycol allowed 30 3 4 2 Charging the water circuit Check that the drain taps are turned off Open all the system s vent valves Turn on the system s shut off devices Start filling by slowly turning on the system s water charging tap When water starts coming out of the vent valves close them and continue charging until the manometer shows at least 1 bar e Check for any leaks by looking at the manometer and inspecting the circuit 15 Purestream CWT User and Maintenence Manual doc July 2013 3 5 Electrical connections The machine must be connected to the electricity following the electrical diagram and conforming to the current laws and regulations in the place of installation e The voltage frequency and number of phases os 06 01 027 03 04 05 must conform to the data shown on the machine s identification plate e The power supply voltage must not vary by more than 10 from its nominal value e The frequency must not vary by more than 1 from its nominal value 2 for brief periods e The imbalance between power phases must be lt 2 e Upstream from
42. s downstream from the cut off switch on the electrical panel because doing so risks changing the correct sequence of other devices such as for example the pump and fans Repeat the steps from point 1 Check that the pump has started the pump icon 10 lights up and check the water pressures upstream and downstream from the machine on the manometers previously installed Wait for the electronic controller to verify that the water flow is constant through the signal from the differential pressure switch if the differential pressure switch intervenes alarm code A03 when you press the X ESC button vent the system check that the shut off taps and the functioning of the pump are turned on reset the alarm by holding down the X ESC button for 5 seconds Wait for the compressors to start Start up under critical conditions If the temperatures of the water and air are particularly high and outside operating limits it is possible that the chiller is being asked to work in conditions that are too harsh in this case the CWT models with at least two compressors CWT 25 130 will partially start i e they will work with only one compressor until the water slowly returns within operating limits only then will the machine function at full load For CWT models with one compressor CWT7 20 the consequence of starting up under critical conditions could be the intervention of the high pressure pressure switch to rearm the high pressure pressure swit
43. tancy of the superheating of the gas exiting to the evaporator under its various working conditions and thus ensures that the flow of gas entering the compressor contains no liquid Thanks to these components the vapour compression cycle works as follows the refrigerant liquid evaporates in the evaporator chilling the water the refrigerant vapours are then aspirated from the compressor which compresses them and sends them to the condenser under high pressure here thanks to a flow of forced air from the fans the high pressure refrigerant gas is cooled making it condensed and undercooled The flow of refrigerant liquid then passes through the lamination valve thermostatic expansion valve which drastically reduces its pressure the refrigerant liquid returns to the evaporator at a reduced pressure where it again evaporates taking heat from the water The chilling circuit also includes a water pump which ensures the flow of water to be chilled by evaporation and fans that cool the condenser 2 2 Water circuit The water circuit mainly consists of pump evaporator tank and expansion vessel The water flows first into the evaporator where it is chilled and then to the tank afterwards it is aspirated by the pump which sends it to the system A differential pressure switch on the evaporator checks that the flow of water is sufficient and stops the compressors if the flow capacity of the water does not ensure the good functioning of the
44. the compressor and the continuity of the coil itself Remove dirt from the condenser and any obstacles to the flow of air Wait for the pressure to drop below the reset value 33 bar g then rearm the high pressure pressure switch by pressing the button on top of it see figure in paragraph 6 2 If possible restore conditions that are compatible with the operating limits Rearm the pressure switch Specialised personnel ws Specialised personnel ws Specialised personnel Specialised personnel Possible alarm signal on the Symptom Possible cause electronic controller or other symptom ria Fan not working See point F C Intervention of mA high pressure pressure switch Excessive refrigerant charge High undercooling Drain excess gas Specialised greater than 10K personnel 1 1 18 F Presence of air or Presence of Drain the circuit create Specialised incondensable gas in the bubbles on the vacuum and recharge personnel refrigerant circuit flow peep hole also with undercooling values greater than 5K 9 Coolant filter clogged or Pipe downstream Check and replace Specialised thermostatic valve stuck from the personnel component covered with frost Intervention of Taps of the machine are Open the taps the water turned off differential pressure Water circulation pump Unlock or replace the Specialised blocked or defective pump personnel Circulation pump stopped A03 Ch
45. the electrical panel install a differential switch IDn 0 03A main power switch and slow blow fuses with the specifications shown on the electrical diagram and in the following table Use wires of the section shown on the electrical diagram of the unit ESP0401 11 07 09 10 Example of an electrical panel No Description______zzzz Component ID Cut off switch 2 Compressor and pump protections Fuses Phase sequence control relay Relays Compressor and pump remote switches 7 Transformer 8 Electronic fan speed regulator 9 Earthing terminal Terminal strip Cooling air intake grill A A A A Attention Never change the internal electrical connections as the warranty will be immediately voided Important Screw the wires solidly to the terminal strip of the cut off switch and lock the wire with a cable gland Important Make the cable entering the machine enters the cable gland from below this prevents rain from dripping inside the machine Important The earth connection is obligatory connect the earth wire to the terminal provided in the electrical panel see the figure of the electrical panel in this paragraph The ground wire must be longer than the other wires so that it will be the last one to be pulled if the device holding the cable loosens 16 Purestream CWT User and Maintenence Manual doc July 2013 3 5 2 Connecting a remote on off switch A remote on off switch can be co
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