CFT-25 Recirculating Chiller
Contents
1. Illustration A Illustration B 18 External Pressure Regulator Optional For applications requiring a maximum pressure less than 55 PSI 380 kPa an External Pressure Reducer EPR is available An EPR allows an adjust able operating pressure of 10 to 50 PSI 70 to 345 kPa If the pressure of the fluid leaving the chiller exceeds the relief valve setting the relief valve will bypass excess fluid back into the chiller to relieve the overpressure The pressure of the system is determined by the back pressure of the connected equipment and the flow rate of the recirculating fluid to your application Connect the EPR as described NOTE Install the fittings in the exact sequence shown NOTE Use Teflon tape on all threaded fittings Connect the Inlet Tee Assembly 1 to the chiller Connect the Outlet Tee Assembly 2 to the chiller Attach the relief valve 3 to the Outlet Tee Assembly 2 Attach the Hose Nipple 4 to the et Relief Valve 3 Attach the Hose 3 5 between the Inlet Tee Assem d do bly 1 and the Hose Nipple 4 The EPR is now installed Connect the inlet to your application to the remaining fitting of the Outlet Tee Assembly 2 Connect the outlet from your application to the remaining fitting of the Inlet Tee Assembly 1 Tighten the hose clamps tight enough to prevent leakage Do not overtighten or the clamps will bite into the flexible tubing and cause excessive we2. 38 Dimension G 20 6 21 25 3514 414 Dimension H 1 1 ND UND 1 Crate Dimensions 31x23x28 31x23x32 32x23x40 33x29x42 35x33x56 HxWxD Shipping Weight 110 161 181 320 450 Air Intake 280 375 800 1050 2500 Electrical Requirements Volts 115V 115V 208 230V 208 2300V 208 230 V Hertz 60Hz 60Hz 60Hz 60Hz 60Hz Phase 1 1 1 1 3 Plug NEMA5 15P NEMA5 20P NEMAL6 15P NEMAL6 20P NA 1 Dimension A is the height of the unit The unit width and depth dimensions B and C are the case dimensions Add approximately 2 inches to include the plumbing connections Dimension D is the distance from the floor to the bottom of the unit case height of the castors Dimension E is the distance from the floor to the center of the DRAIN connection CFT 300 only Dimension F is the distance from the floor of the center of the OUTLET connection Dimension G is the distance from the floor of the center of the INLET connection Dimension H is the distance from the unit s left side to the center of the INLET OUTLET and DRAIN connections Weights are given in pounds Air intake is given in cubic feet per minute EEGEN Rev 01 30 97 Pump Capacity Pressure Pressure 2 7 1 2 3 4 3 8 7 5 11 3 15 1 Flow Flow 1 To determine which pump is installed refer to the label on the rear of your unit 5 GPM 19 0 LPM A PD 1 60Hz B PD 1 50Hz C PD 2 60Hz D PD 2 50Hz GPM LPM Gite Section Ill Installation The unit should be located in a la
3. damage the pump seals Use of automobile anti freeze will void the manufacturer s warranty Do not replace reservoir plug with a non vented type or damage to the tank may occur For personal safety and equipment reliability the following procedure should only be performed by a competent technician Contact our Service Department for assistance see Preface After sale Support Additional Warnings In addition to the specific warnings listed on the previous page the following general warnings apply to you unit Performance of installation operation or maintenance procedures other than those described in this manual may result in a hazardous situation and may void the manufacturer s warranty Transport the unit with care Sudden jolts or drops can damage the refrigeration lines Observe all warning labels Never remove warning labels Never operate damaged or leaking equipment Never operate the unit without cooling fluid in the reservoir Always turn off the unit and disconnect the power cord from the power source before performing any service or maintenance procedures or before moving the unit Always empty the reservoir before moving the unit Never operate equipment with damaged power cords Refer service and repairs to a qualified technician Section Il General Information Description The CFT Recirculating Chiller is designed to provide a continuous supply of cooling fluid at a constant temperature and vol
4. recommend a visual inspection of the condenser be made monthly after initial installation After several months the frequency of cleaning will be established 20 Algae Pump Strainer To restrict the growth of algae in the reservoir it is recommended that the reservoir cover be kept in place and that all circulation lines be opaque This will eliminate the entrance of light which is required for the growth of most common algae NESLAB recommends the use of Chloramine T one gram per gallon Units with PD pumps have a strainer Refer to the pump label on the rear of the unit to identify the type of pump in your unit If debris is in the system the strainer will prevent the material from being drawn into the pump and damaging the pump vanes After initial installation the strainer may become clogged with debris and scale Therefore the strainer must be cleaned after the first week of installa tion After this first cleaning a monthly visual inspection is recommended After several months the frequency of cleaning will be established Before cleaning the strainer disconnect the power cord from the power source and drain the reservoir PD 1 pumps have a wire mesh strainer located in the pump head PD 2 pumps have the strainer located in the pump suction line Remove the wrapper from the unit Unscrew the larger of the two acorn nuts on the pump head and remove the screen Clean the screen by rinsing it with water Wh
5. C Complies with UL 3101 1 93 EMC 89 336 EEC EN 55011 Class A Verification EN 50082 1 1992 IEC 1000 4 2 1995 IEC 1000 4 3 1994 IEC 1000 4 4 1995 For any additional information refer to the Letter of Compliance that shipped with the unit Declaration of Conformity Retain all cartons and packing material until the unit is operated and found to be in good condition If the unit shows external or internal damage or does not operate properly contact the transportation company and file a damage claim Under ICC regulations this is your responsibility If this product has been modified to operate at 0 C or lower it has been tested with a non freezing fluid Although the system has been drained some residual fluid may remain This will not hinder your unit s performance Units have a warranty against defective parts and workmanship for one full year from date of shipment See back page for more details NESLAB is committed to customer service both during and after the sale If you have questions concerning the unit operation contact our Sales Depart ment If your unit fails to operate properly or if you have questions concern ing spare parts or Service Contracts contact our Service Department Before calling please refer to the labels on the rear of the unit to obtain the following information unit BOM number unit serial number pump type Warnings A Section Safety Warnings are posted throughout
6. CFT Series Recirculating Chiller NESLAB Manual P N 002167 Rev 08 20 97 Instruction and Operation Manual NESLAB online Product Service Information Electronic Catalog Applications Notes MSDS Forms e mail 603 427 2490 Set modem to 8 N 1 protocol 1200 14400 baud Voice Info 800 4 NESLAB Comments on this manual can be sent to NESLAB lifesciences com or visit our Web page at http www neslabinc com CFT Series Recirculating Chiller PREFACE SECTION Safety SECTION Il General Information SECTION III Installation SECTION IV Operation SECTION V Maintenance amp Service SECTION VI Troubleshooting WARRANTY elle 3 UNPACKING BEE 3 VARATI cinien eege Age ercer cece nr rrrctneceer eye rcercecere pert rreceer errr cece 3 After Sale SUpport feicezessiscecesues sed ENEE EES 3 Wanga Seress E S E eereete EL d eg ek Ee 4 Additional Warnings A 5 De SCIiPtlO EE 6 ee We Me IEN 6 Cooling Capacity cceceeeecececeeeeececeeeeeeeeeeeeeeaeeeseaaeeeeeeeeeestaeeesenaeeeneenes 8 lte Re lee LEE 8 EE 9 Electrical Requirements ssseeesseeseeereesrreseeesrtrssstrnsstnntnnensrenssennnernnnne 10 Plumbing Requirements ccccccceceeeeeececeeeeeeeeeeeeeaeeeseaeeeseneeesesaeees 10 RUE 11 Water Quality Standards and Recommendations ssssssnnnsseeernenee eeen 12 Filling Heourements seernes nn aE E S 14 Stant Upi E 15 Analog Temperature Controller ccccccccceeeeceeeeeeee
7. LIED INCLUDING BUT NOT LIMITED TO WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE NESLAB S OBLIGATION UNDER THIS WARRANTY IS STRICTLY AND EXCLUSIVELY LIMITED TO THE REPAIR OR REPLACEMENT OF DEFECTIVE COMPONENT PARTS AND NESLAB DOES NOT ASSUME OR AUTHORIZE ANYONE TO ASSUME FOR IT ANY OTHER OBLIGATION NESLAB ASSUMES NO RESPONSIBILITY FOR INCIDENTAL CONSEQUENTIAL OR OTHER DAM AGES INCLUDING BUT NOT LIMITED TO LOSS OR DAMAGE TO PROPERTY LOSS OF PROFITS OR REVENUE LOSS OF THE UNIT LOSS OF TIME OR INCONVENIENCE This warranty applies to units sold in the United States Any units sold elsewhere are warranted by the affiliated marketing company of NESLAB Instruments Inc This warranty and all matters arising pursuant to it shall be governed by the law of the State of New Hampshire United States All legal actions brought in relation hereto shall be filed in the appropriate state or federal courts in New Hampshire unless waived by NESLAB
8. Section Il Specifications and to the serial number label on the rear of the unit for the specific electrical requirements of your unit The CFT 300 is supplied with a disconnect box Wire the power connections in accordance to local state and federal electrical codes Double check all wiring to make sure it is properly connected and protected from the elements The CFT 300 is also equipped with a compressor crankcase heater The crankcase heater warms the oil in the compressor and prevents refrigerant from mixing with the oil Before start up the unit must be connected to its power source for at least 12 hours This allows time for the oil to be heated and separate from the refrigerant Before installing the unit to an instrument that previously used tap water as a cooling fluid flush the instrument several times to remove any rust or scale that has built up The manufacturer of the instrument should be able to recommend a cleaning fluid for their equipment The plumbing connections are located on the rear of the unit and are labelled OUTLET SUPPLY and INLET RETURN CFT 25 to CFT 150 connections are 1 2 inch FPT CFT 150s with CP 55 pumps are inch and CFT 300 connections are 3 4 inch FPT Remove the plastic protective plugs from both plumbing connections Connect the OUTLET SUPPLY fitting to the inlet of the instrument being cooled Connect the INLET RETURN fitting to the outlet of the instrument being cooled Never connect the f
9. ar If a torque wrench is available torque hose clamps to 50 in lbs 280 cm kg Nylon reinforced hose tends to cold flow so the clamps will need to retorqued later The hose clamps do not actually loosen but rather the hose outside diameter decreases The T adjustment handle is equipped with a locknut To adjust the relief pressure setting loosen the locknut and turn the T handle to the minimum pressure setting direction of arrow To simulate blockage close or pinch off the hose between the EPR outlet tee assembly and the instrument being cooled Monitor the operating pres sure of the unit Turn the T handle until the desired relief pressure is set The EPR valve cannot be set lower than the total back pressure of the instrument being cooled or the instrument will not receive any flow Tighten the locknut to secure the position of the T handle Open the hose between the EPR outlet tee assembly and the instrument being cooled 19 A Service Contracts Draining the Reservoir Cleaning Section V Maintenance and Service For personal safety and equipment reliability the following procedure should only be performed by a competent technician Contact our Service Department for assistance see Preface After sale Support NESLAB offers on site Service Contracts that are designed to provide extended life and minimal down time for your unit For more information contact our Service Department see Preface After
10. boratory or clean industrial environment where ambient temperatures are inside the range of 13 C to 35 C Never place the unit in a location where excessive heat moisture or corrosive materials are present The unit has an air cooled refrigeration system Air is drawn through the front of the unit and discharged through rear and side panels The unit must be positioned so the intake and discharge are not impeded A minimum clearance of 18 inches 45 centimeters on all vented sides is necessary for adequate ventilation Inadequate ventilation will cause a reduction in cooling capacity and in extreme cases compressor failure Excessively dusty areas should be avoided and a periodic cleaning schedule should be instituted see Section V Cleaning The unit will retain its full rated capacity in ambient temperatures up to approximately 24 C Above 24 C derate the cooling capacity 1 for every 0 5 C above 24 C up to a maximum ambient temperature of 35 C CG Io S RESLA Direction of Air Flow Electrical Requirements A Plumbing Requirements The unit construction provides extra protection against the risk of electrical shock by grounding appropriate metal parts The extra protection may not function unless the power cord is connected to a properly grounded outlet It is the user s responsibility to assure a proper ground connection is provided Refer to
11. breach of warranty shall be cause for cancellation or recision of the contract of sales of any unit With respect to units that qualify for field service repairs NESLAB s responsibility is limited to the component parts necessary for the repair and the labor that is required on site to perform the repair Any travel labor or mileage charges are the financial responsibility of the buyer The buyer shall be responsible for any evaluation or warranty service call including labor charges if no defects are found with the NESLAB product This warranty does not cover any unit that has been subject to misuse neglect or accident This warranty does not apply to any damage to the unit that is the result of improper installation or maintenance or to any unit that has been operated or maintained in any way contrary to the operating or maintenance instructions specified in NESLAB s Instruction and Operation Manual This warranty does not cover any unit that has been altered or modified so as to change its intended use In addition this warranty does not extend to repairs made by the use of parts accessories or fluids which are either incompatible with the unit or adversely affect its operation performance or durability NESLAB reserves the right to change or improve the design of any unit without assuming any obligation to modify any unit previously manufactured THE FOREGOING EXPRESS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMP
12. d be avoided and a periodic cleaning schedule should be instituted For proper operation the unit needs to pull substantial amounts of air through a condenser A build up of dust or debris on the fins of the con denser will lead to a loss of cooling capacity The unit will retain its full rated capacity in ambi ent temperatures up to approximately 24 C Make sure the voltage of the power source meets the specified voltage 10 The plumbing connections are located on the rear of the unit and are labelled either SUPPLY and RETURN or OUTLET and INLET These connec tions are 1 2 inch FPT inch FPT for CFT 300s Remove the plastic protective plugs from both plumbing connections Connect the OUTLET SUPPLY fitting to the inlet of the instrument being cooled Connect the INLET RETURN fitting to the outlet of the instrument being cooled To fill the reservoir remove the reservoir access panel by unscrewing the thumbscrews Locate the reservoir plug Square nut Remove the plug and fill the reservoir with clean cooling fluid Tap water is the recommended fluid for operation from 8 C to 30 C Below 8 C a non freezing fluid must be used A mixture of tap water and laboratory grade ethylene glycol is suggested Operation Before starting the unit double check all electrical and plumbing connections Make sure the circulat ing system has been filled with cooling fluid To start the unit place the Power Switch to the on
13. d fill the reservoir with clean cooling fluid following the special considerations outlined in the following paragraphs Thumbscrew ae Reservoir Access Panel Reservoir Plug Reservoir filling locations Typical NOTE The CFT 300 has a FILL lamp which illuminates whenever the reservoir level is below normal operating level Circulating to a closed system closed to the atmosphere Fill the reservoir to the bottom of the fill hole threads Since the reservoir capacity is small compared to many instruments being cooled have extra cooling fluid on hand to keep the system topped off when external circulation is started NOTE The tank in your unit has a vent which relieves pressure built up from thermal expansion of water The vent is located on the reservoir plug It activates when tank pressure reaches 3 5 psi Do not replace reservoir plug with an non vented type or damage to the tank may occur Circulating to an open system open to the atmosphere Fill the reservoir so of the fill hole threads are covered Wrap the tank plug with Teflon sealing tape Replace the tank plug and tighten securely to prevent air entry When circulating cooling fluid to an open vessel or tank connect the OUT LET SUPPLY and INLET RETURN lines to the open tank Secure the INLET RETURN suction line below the fluid surface The INLET RETURN line should be submerged deep enough to avoid sucking air Make sure the INLET RETURN lin
14. d periodically When operating at low temperatures the concen tration of water in the cooling fluid will increase over time leading to a loss of cooling capacity Before changing the cooling fluid raise the unit s operating temperature to de ice the cooling coils Periodic vacuuming of the condenser fins is necessary The frequency of cleaning depends on the operating environment We recommend a visual inspection of the condenser be made monthly after initial installation After several months the cleaning frequency will be estab lished Units with PD pumps have a strainer If debris is in the system the strainer will prevent the material from being drawn into the pump and damaging the pump vanes After initial installation the strainer may become clogged The strainer must be cleaned after the first week of installation After this first cleaning a monthly visual inspection is recommended After several months the frequency of cleaning will be established Before cleaning disconnect the power cord from the power source and drain the reservoir Compliance Unpacking Warranty After sale Support Preface Products tested and found to be in compliance with the requirements defined in the EMC standards defined by 89 336 EEC as well as Low Voltage Directive LVD 73 23 EEC can be identified by the CE label on the rear of the unit The testing has demonstrated compliance with the following direc tives LVD 73 23 EE
15. de 20 C ambient 100 water in the reservoir Wrapper removed BER Checklist Service Assistance Section VI Troubleshooting Unit will not start Check the line cord make sure it is plugged in Check the voltage of the power source Make sure it is within the rated voltage of the unit 10 Check that the Power Switch Circuit Breaker has not tripped Check the setting on the optional High Temperature Cutout CFT 300 units are equipped with high and low pressure switches If either switch activates the unit will shut down Once the cause has been deter mined you have to manually reset the switch The switches are located behind the rear panel See Section IV Operation on page 17 Unit will not circulate fluid Check the reservoir level Fill if necessary Make sure the pump has been purged Check the pressure gauge units with PD pumps If the reading is 60 psig check the instrument being cooled for restrictions in the cooling line Check the pump strainer units with PD pumps A clogged strainer can starve the pump Inadequate temperature control If the temperature continues to rise make sure the heat load of the instrument being cooled does not exceed the rated specification See Section Il Specifications on page 6 Make sure the air intake and discharge are not impeded and the ambient temperature does not exceed 35 C Make sure the condenser is free of dust and debris See Section VI Cleaning on pag
16. e 20 If the compressor short cycles a clicking sound check the line voltage It should be within the 10 of the specified voltage Wait 5 minutes before restarting the unit If after following these troubleshooting steps your unit fails to operate properly contact our Service Department for assistance see Preface After sale Support Before calling please refer to the serial number label on the rear of the unit to obtain the following information unit BOM number unit serial number voltage of unit voltage of power source 23 Pump Flow Diagram Reservoir Relief Valve PD Pumps Only Pressure Gauge PD Pumps Only Strainer PD Pumps Only Supply Return WARRANTY NESLAB Instruments Inc warrants for 12 months from date of shipment any NESLAB unit according to the following terms Any part of the unit manufactured or supplied by NESLAB and found in the reasonable judgment of NESLAB to be defective in material or workmanship will be repaired at an authorized NESLAB Repair Depot without charge for parts or labor The unit including any defective part must be returned to an authorized NESLAB Repair Depot within the warranty period The expense of returning the unit to the authorized NESLAB Repair Depot for warranty service will be paid for by the buyer NESLAB s responsibility in respect to warranty claims is limited to performing the required repairs or replacements and no claim of
17. e is free of particles and debris that can block the flow of fluid A baffle or screen may be required 14 Start Up Analog Temperature Controller Section IV Operation Before starting the unit double check all electrical and plumbing connections and make sure the circulating system the CFT the instrument being cooled and the tubing that connects them has been properly filled with cooling fluid To start the unit place the POWER Switch to the on 1 position The refrigeration system and the recirculation pump will start The POWER Switch illuminates except for the CFT 150 to indicate the system is operat ing Units with PD pumps display the pump operating pressure on the RECIRCULATING PRESSURE gauge To turn the unit off place the POWER Switch to the off 0 position The Cool LED on the front panel indicate the status of the refrigeration system It illuminates to indicate the refrigeration system is removing heat from the cooling fluid As the operating temperature approaches the temperature setpoint the LED will extinguish The Idle LED on the front panel of CFT 150 units indicates the unit is in a hot gas bypass mode of operation As the operating temperature approaches the temperature setpoint the Cool and Idle LEDs cycle to indicate the approximate duty cycle of the unit When the unit is shut off wait approximately five minutes before restarting This allows time for the refrigeration pressures to equalize If
18. eeeaeeseeeeeeeeaeeees 15 Digital Temperature Controller cccceeeeeeeeeeceeeeeeeeeeeeeeeeeeeeeeeeeeeees 16 Pressure Relief Valve cecccccecesceecseceeeeecceeeeeeeeeeeeaaaeeeeaeeeeeeeeeeseaaeeeas 16 High Temperature Cutout Optional cccccceeeeeeeeeeeeseeeeeeeeeeeeeneeeees 17 CFT 300 High Low Pressure Cutouts ccccccceceeeeeeeeeeeseeeeseteeeeeaeees 17 CFT 150 High Pressure Cutout ccceeceeceeceeeeeceeeeeeeeaeeseeueeeeeeaeeeseas 17 Heater Package Optional cccceceseeeeeeceeeseeeeeeeseeeeesaaeeseeueeeeeeaeees 18 External Pressure Regulator Optional ccccssceeeeceeeeeeeeeeeteeeeeeees 19 Senvice Contracts EE 20 Draining hue 20 CNS AMUN aioe seen eee eee edie wt apleabe cores CEET deen 20 ale EE 21 el Tt 21 PUMP EUDIICATION BEE 22 TOS OS eritrea E dee get E EEEE E 22 Suction Discharge Presssure Speed Check cceeceeeeseeeeeeeeeeeeeeees 22 CHECKS Tasaisen gae baste ae rested eE AA er b ndeeeeget 23 Service Assistant ccome EES Ee D s 23 Pump Flow Diagramo eceirnise nin E a AR 24 CFT Series Quick Reference Operating Procedures Installation The unit has an air cooled refrigeration system Air is drawn in the front of the unit and discharged through rear and side Position the unit so the intake and discharge are not impeded Inadequate ventilation will cause a reduction in cooling capacity and in extreme cases compressor failure Excessively dusty areas shoul
19. en the screen is clean replace it in the strainer tighten the acorn nut and replace the wrapper Refer to Section III Filling Requirements for instruc tions on replacing the cooling fluid PD 2 Strainer PD 1 Strainer 21 Pump Motor Lubrication PD pump motors require periodic lubrication Refer to the pump label on the rear of the unit to identify the type of pump in your unit PD pumps use sleeve type bearings with large reservoirs Oiling instructions are generally posted on each motor In the absence of instructions add approximately 30 to 35 drops of SAE 20 non detergent oil to each bearing on the following schedule SAE 20 142 CS viscosity Duty Cycle Oiling Frequency Continuous Intermittent Once every year Once every 2 years Hoses Occasional Once every 5 years Fill Holes Typical i The unit s internal and external hoses and clamps should be inspected and tightened on at least a semiannual basis Suction Discharge Pressure Speed Check Unit Pump Refrigerant Suction PSIG Discharge PSIG Speed C Min CFT 25 PD 1 CFT 25 MD 30 CFT 33 PD1 2 CFT 75 PD1 2 CFT 150 PD2 CFT 300 PD2 CFT 300 CP 55 R134a R134a R134a R134a R22 R22 R22 36 38 25 28 42 45 37 41 70 160 170 145 160 180 200 170 185 270 265 280 268 280 Standard temperature 60 Hertz units derate 17 for 50 Hertz Units 20 C fluid temperature unit inthe COOL mo
20. ittings to your building water supply or any water pressure source Plumbing Connections Typical 10 Fluids Two sets of plumbing adapters are included with CFT 25 to CFT 150 units One set of adapters will accept s inch ID tubing The other set will accept Ye inch ID tubing If the unit is being plumbed using flexible tubing install one set of adapters in the plumbing ports To prevent leaking be sure to wrap the threads of the adapters with Teflon sealing tape before installing them in the plumbing ports Flexible tubing if used should be of heavy wall or reinforced construction All tubing should be rated to withstand 80 psig at 30 C Make sure all tubing connections are securely clamped Avoid running tubing near radia tors hot water pipes etc If substantial lengths of tubing are necessary insulation may be required to prevent loss of cooling capacity Tubing and insulation are available from NESLAB Contact our Sales Department for more information see Preface After sale Support It is important to keep the distance between the unit and the instrument being cooled as short as possible and to use the largest diameter tubing practical Tubing should be straight and without bends If diameter reductions must be made they should be made at the inlet and outlet of the instrument being cooled not at the CFT If substantial lengths of cooling lines are required they should be pre filled with cooling fluid befo
21. ivates if there is a blockage in the refrigeration lines or if the refrigerant temperature becomes too hot The HPC is factory preset at 400psi The cutout is located inside the case behind the rear panel Once the cause of the shut down has been determined and corrected manually depress the white button on the applicable cutout If a click is not heard when depress ing the button the cutout was not activated and the unit shut down for another reason 17 Heater Package Optional Heaters are controlled by a switch on the temperature controller The heater itself is accessible through the small service panel on the rear of the unit These units also have a Low Level indicator The indicator illuminates if the fluid level in the reservoir drops below proper operating level Illustration A shows the desired fluid level for normal operation Should the reservoir be filled as shown in illustration B units designed to operate at high end temperatures near boiling may cause air in the reser voir to become trapped The air can be vented by slightly tilting the unit forward on its front castors Any fluid venting from the reservoir will drain through a hose which feeds to a small hole in the bottom of the unit Do not used silicon based fluids with units designed to operate at high temperatures These type fluids will damage the hoses and pump seal LL EL GC p Fluid Level Fluid Level
22. ng which can be observed at the studs and on the outside surface of cooling coils Eventually the pitting will become so extensive that the coil will leak refrigerant into the water reservoir As an example raw water in the United States averages 171 ppm as NaCl The recommended level for use in a water system is between 0 5 to 5 0 ppm as NaCl Recommendation Initially fill the tank with distilled deionized water Do not use untreated tap water as the total ionized solids level may be too high 12 Maintain this water quality at a resistivity of between 1 to 10 megohm cm compensated at 25 C by using a purification system Although the initial fill may be as high as 10 megohm cm compensated at 25 C the desired level for long time usage is 1 to 3 megohm cm compensated at 25 C The above two recommendations will reduce the electrolytic potential of the water and prevent or reduce the galvanic corrosion observed 18 30 Not Recommended Increasingly Corrosive O lp 15 00 AAANAS Nr E Q 10 00 Operations with Stainless Steel Systems S E gt 3 00 D Operations with 1 00 Mixed Metals ke Copper Brass Stainless Steel CONSULT MATERIALS ENGINEER 0 10 0 05 10 20 30 40 50 60 70 80 Temperature C Water Quality Considerations 13 Filling Requirements Remove the reservoir access panel by unscrewing the thumbscrews Locate the reservoir plug Square nut Remove the plug an
23. position The Power Switch illuminates except for the CFT 150 to indicate the system is operating To turn the unit off place the Power Switch to the off position The Cool LED indicates the status of the refrigera tion system It illuminates to indicate the refrigera tion system is removing heat from the cooling fluid As the operating temperature approaches the setpoint the LED will extinguish When the unit is shut off wait approximately five minutes before restarting This allows time for the refrigeration pressures to equalize If the pres suresare not allowed to equalize the compressor will short cycle and no cooling will occur Analog Controller Temperature Adjustment To adjust the temperature setpoint turn the C dial on the front of the unit to the desired tempera ture Digital Controller Temperature Adjustment To display the temperature setpoint press and hold the DISPLAY switch To adjust the tempera ture setpoint press and hold the DISPLAY switch and turn the ADJUST knob until the desired temperature setpoint is indicated on the digital display Once the setpoint is adjusted release the DISPLAY switch The display will now indicate the temperature of the fluid in the reservoir Periodic Maintenance Periodically inspect the reservoir fluid If cleaning is necessary flush the reservoir with a cleaning fluid compatible with the circulating system and the cooling fluid The cooling fluid should be replace
24. re connecting them to the unit The selected fluid must have a viscosity of 50 centistokes or less at the lowest operating temperature Never use flammable or corrosive fluids with this unit Distilled and deionized water may be aggressive and cause material corrosion Please contact NESLAB before subjecting this unit to prolonged exposure to distilled or deionized water Tap water is the recommended fluid for operation from 8 C to 30 C See Water Quality Standards and Recommendations on the next page Below 8 C a non freezing fluid must be used A mixture of tap water and laboratory grade ethylene glycol is suggested Do not use automobile anti freeze Commercial anti freeze contains silicates that can damage the pump seals Use of automobile anti freeze will void the manufacturer s warranty 11 Water Quality Standards and Recommendations Permissible PPM Desirable PPM Microbiologicals algae bacteria fungi Inorganic Chemicals Calcium Chloride Copper Iron Lead Magnesium Manganese Nitrates Nitrites Potassium Silicate Sodium Sulfate Hardness Total Dissolved Solids Other Parameters pH 6 5 8 5 Resistivity 0 01 Megohm Cm Compensated at 25C Unfavorably high total ionized solids TIS can accelerate the rate of gal vanic corrosion These contaminants can function as electrolytes which increase the potential for galvanic cell corrosion and lead to localized corrosion such as pitti
25. sale Support The CFT 300 is equipped with a Le inch FPT DRAIN fitting located on the rear of the unit To drain the CFT 25 to CFT 150 reservoirs we recommend the use of a wet dry vacuum Remove the reservoir plug and carefully insert the wet dry vacuum so as not to damage the cooling coils NOTE Tilting the unit more than 45 may allow compressor oil to seep into the suction line Reservoir Periodically inspect the fluid inside the reservoir If cleaning is necessary flush the reservoir with a cleaning fluid compatible with the circulating system and the cooling fluid The cooling fluid should be replaced periodically When operating at low temperatures the concentration of water in the cooling fluid will increase over time leading to a loss of cooling capacity Before changing the cooling fluid raise the operating temperature of the unit to de ice the cooling coils Refer to Section III Filling Requirements for instructions on replacing the cooling fluid Condenser For proper operation the unit needs to pull substantial amounts of air through a condenser A build up of dust or debris on the fins of the con denser will lead to a loss of cooling capacity The lower front of the unit has a one piece grille assembly Gently pry the assembly off with a flathead screwdriver Use care not to scratch the paint Periodic vacuuming of the condenser fins is necessary The frequency of cleaning depends on the operating environment We
26. the manual These warnings are desig nated by an exclamation mark inside an equilateral triangle and text highlighted in bold Read and follow these important instructions Failure to observe these instructions can result in permanent damage to the unit significant property damage or personal injury or death Make sure you read and understand all instructions and safety precautions listed in this manual before installing or operating your unit If you have any questions concerning the operation of your unit or the information in this manual please contact our Sales Department see After sale Support Never place the unit in a location where excessive heat moisture or corrosive materials are present The unit construction provides extra protection against the risk of electrical shock by grounding appropriate metal parts The extra protection may not function unless the power cord is connected to a properly grounded outlet It is the user s responsibility to assure a proper ground connection is provided Never connect the OUTLET SUPPLY or INLET RETURN fitting to your building water supply or any water pressure source Never use flammable or corrosive fluids with this unit Distilled and deionized water may be aggressive and cause material corrosion Please contact NESLAB before subjecting this unit to prolonged exposure to distilled or deionized water Do not use automobile anti freeze Commercial anti freeze contains silicates that can
27. the pressures are not allowed to equalize the compressor will short cycle clicking sound and no cooling will occur Temperature Adjustment To adjust the temperature setpoint turn the calibrated C dial on the front of the unit to the desired temperature Analog Temperature Controller Typical 15 Digital Temperature Controller Pressure Relief Valve Temperature Adjustment To display the temperature setpoint press and hold the DISPLAY switch To adjust the temperature setpoint press and hold the DISPLAY switch and turn the ADJUST knob until the desired temperature setpoint is indicated on the digital display Once the setpoint is adjusted release the DISPLAY switch The display will now indicate the temperature of the fluid in the reservoir NOTE Inadvertent movement of the ADJUST knob regardless of the position of the DISPLAY switch will result in a change in the setpoint This change will not be immediately reflected on the digital display unless the DISPLAY switch is pressed The digital display will eventually change as the unit reacts to the new setpoint Sek coo oh SCH O DISPLAY ADJUST POWER Digital Temperature Controller Typical Units with PD pumps have a pressure relief valve which establishes the maximum operating pressure of the unit If the pressure of the fluid leaving the pump exceeds the valve setting the relief valve will bypass the fluid within the unit to relieve the press
28. ume The unit consists of an air cooled refrigeration system a sealable reservoir recirculating pump and a temperature controller Throughout the manual you will be asked to consult the unit s serial number label or the pump identification label for specific information Both labels are located on the rear of the unit Specifications CFT 25 CFT 33 CFT 75 CFT 150 CFT 300 Cooling Capacity 60Hz 580 Watts 950 Watts 2100 Watts 4500Watts 10650 Watts 50Hz 475 Watts 1000 Watts 1900 Watts 3735 Watts 9000 Watts Temperature Range 5 C to 30 C 45 C to 35 C Temperature Stability Analog Temperature 1 0 C Controller Ir Digital Temperature 0 5 1 0 Controller Reservoir Volume Gallons 0 5 1 1 1 8 5 6 Liters 1 9 4 1 6 8 21 3 Refrigerant R134a R22 1 Circulating water at 20 C at 20 C ambient Cooling capacity will vary depending on fluid temperature ambient temperature and cooling fluid A PD 1 pump was used in the CFT 25 a PD 2 in the other units Stability determined for CFT 150 analog unit with 75 heat load 20 C circulating temperature CFT 300 stabliity determined with 86 heat load ou CFT25 CFT33 CFT75 CFT150 CFT300 Unit Dimensions Dimension A 22 242 2612 36 43 Dimension B 12 14 14 7 s 213 s 25 Dimension C 21 22 242 27 28 2 Dimension D 23 4 2 2 2 3 23 4 Dimension E NA NA NA NA 29 Dimension F 17 he 18 22 32
29. ure The relief valve does not determine the actual operating pressure the operating pressure is determined by the back pressure of the system If an adjustment is necessary contact our Customer Service Department 16 High Temperature Cutout Optional CFT 300 High Low Pressure Cutout CFT 150 High Pressure Cutout The High Temperature Cutout HTC is designed to shut down the unit in the event the temperature of the fluid in the reservoir exceeds the HTC setting The HTC is normally located on the rear of the unit NOTE The HTC temperature scale is in F CFT 300 units are equipped with high and low refrigeration pressure cutouts Should either cutout activate the unit will shut down The High Pressure Cutout HPC activates if there is a blockage in the refrigeration lines or if the refrigerant temperature becomes too hot The HPC is factory preset at 400psi The Low Pressure Cutout LPC activates if there is a leak in the refrigera tion lines THE LPC is factory preset at 4psi Both cutouts are located inside the case behind the rear panel Once the cause of the shut down has been determined and corrected manually depress the white button on the applicable cutout If a click is not heard when depressing the button the cutout was not activated and the unit shut down for another reason Some CFT 150 units are equipped with High Pressure Cutouts HPC Should the HPC activate the unit will shut down The HPC act
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