Precision Digital Circulating Water Baths Models
Contents
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4. 8 LIWIT AS Quo 19N3SSV HOSN3S 29 3177890 P N OILVIN3HOS TANVd TOHLNOO s SISSVHO 1234567 89 1011 12131415 16 HOLIMS H3MOd PA maa NIDNNAOHS sasni M 201 6 5 1006 8 8 5 dWAL NO SN3dO HOLIMS 901 9 89 Loszzere 10154675 9N3SSY 89411 1gN3SSV g82d THVOSA3M 01 062 6099 696 ADVLIOA 5 LNOLNO LHH moa 60117578 19N3SSV HOSN3S SYNLVYHAdWAL 30 3177890 P N 1021 NOLLO3NNOO 434 A008 30 3DIS3INI NN solr 01 10199107 JeleaH 378 J n 2 110119 dual SOLOW OL ANT YAMS J8MOdg p109 14617 uBiH B laued 04402 ug pore201 23 1e1soullau P N 3177890 WWLAd 448 AGO HO
5. Silicon Hose Hose Clamp 115 SIDE VIEW WITH CONTROL COVER REMOVED AND WIRING EXCLUDED P N 3177890 23 THERMOSTAT SCREW CAP SCREW SCREW NUT SCREW j 2 SOCKET SILICONHOSE BRACKET PUMP HOSECLAMP 230 SIDE VIEW WITH CONTROL COVER REMOVED AND WIRING EXCLUDED P N 3177890 24 O RING SUPPLIED TUBEADAPTER 7 OUTLET 1 8 HALF COUPLING WITH FITTING NUT 7 7 7 FLEX FITTING TEMP PROBE ASSEMBLY NUT THERMOSTAT BULB PART OF THERMOSTAT TO REMOVE TEMPERATURE PROBE HOLD NUT ON INSIDE OF PAN CLOSEST TO PAN WALL FIRMLY WITH WRENCH REMOVE FLEX FITTING SLIDE RUBBER GROMMET OVER END OF TEMPERATURE PROBE SLIDE TEMPERATURE PROBE INTO CONTROL HOUSING CUTAWAY DETAIL OF TEMP PROBE amp PUMP OUTLET P N 3177890 25 Pump Inlet Fitting Nut 2 H Bath Pan B Y lt Pump Inlet udo Heater Pul VA gt rr n L 7 Heater Lead 1 part of wire harness Nut provided with heater a Bath a u
6. 17 ASSEMBLY amp SCHEMATIC DW GS VES dux 19 WARRANTY bon RR 28 INTRODUCTION Your satisfaction and safety are important to Thermo and a complete understanding of this unit is necessary to attain these objectives As the user of this apparatus you have the responsibility to understand the proper function and operational characteristics of your bath This instruction manual should be thoroughly read and all operators given adequate training before attempting to place this unit inservice Awareness of the stated cautions and warnings and compliance with recommended operating parameters together with maintenance requirements are important for safe and satisfactory operation The unit should be used for its intended application alterations or modifications will VOID THE WARRANTY WARNING AS A ROUTINE LABORATORY PRECAUTION ALWAYS WEAR SAFETY GLASSES WHEN WORKING WITH THIS APPARATUS This product is not intended nor can it be used as a sterile or patient connected device In addition this apparatus is not designed for use in Class or IIl locations as defined by the National Electrical Code CAUTION WHEN UNPACKING THIS PRODUCT TWO PERSONS ARE REQUIRED TO LIFT THE WATER BATH AND PLACE IT ON A BENCH THE BENCH TOP MUST BE RIGID AND STRONG ENOUGH TO COMFORTABLY
7. High Temp O ring Cutout FRONT VIEW CUTAWAY DETAIL OF PUMP INLET amp HEATER P N 3177890 26 O ring Nut provided s with heater Nut Heater provided a with heater ar Heater lead TO REMOVE HEATER REMOVE HEATER BRACKET S part of wire FROM INSIDE OF PAN harness REMOVE HEATER LEADS FROM END OF HEATER REMOVE LARGE NUT LOCATED IN AREA BETWEEN PAN AND BODY WALL Insulation LIFT HEATER OUT OF PAN g uem Body gie OP V Bottom cover HEATER REMOVAL DETAIL HEX NUT Hex Nut Drain Plug CUTAWAY VIEW OF DRAIN P N 3177890 27 2 r4 0 CONTROL f L EHE NUT DISPLAY PCB ASSY LOCATED CPU ASSY UNDERNEATH d TOPOWER CPU PCB ASSY SUPPLY BOARD J102 NUT 24 PA P N 3177890 28 OILVIN3HOS TANVd lt SISSVHO 3r pf HOLIMS 1 SN3dO HOLIMS ATEWASSV 824 2 lddns 0 A18W3SSV 99
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10. ASSEMBLY Tygon Tubing N To Water N Suppl pply 1 4 Hose Barb Fitting Hose Clamp Water Level Regulator Bracket FIGURE 1 SIDE VIEW OF BATH To Water Supply Thumbscrew FIGURE 2 CUTAWAY FRONT VIEW OF BATH INLET SCREEN ASSEMBLY OPTIONAL An optional inlet screen assembly is packaged with each unit If used this screen will filter foreign materials i e pieces of paper from being sucked through the pump To install the screen assembly refer to the diagram below NOTE IF USED THE SCREEN ASSEMBLY MUST BE INSPECTED DAILY REMOVE ANY DEBRIS FOUND ON THE SCREEN WATERBATH SILICON HOSE PAN INLET NUT TUBE ADAPTER SCREEN ASSEMBLY FINGER TIGHTEN ONLY NOTE INLET IS THE LOWER OF THE 2 PORTS DIRECTION OF WATER FLOW P N 3177890 5 EXPLANATION OF CONTROLS Power Switch The power switch is located on the lower right hand side of the bath it provides power for the entire unit Hi Limit Thermostat is located immediately to the left of the power switch on the lower right hand corner of the bath The high limit is an adjustable control used to prevent thermal runaway in the event that the primary control fails After you have stabilized the bath temperature use a standard screwdriver to adjust the potentiometer When delivered the Hi Limit is turned fully clockwise highest setting In this position the Hi limit light
11. g 1115 not most likely the opto coupler U1 is bad and the POWER SUPPLY board will have to be replaced If it is continue on h Measure the voltage directly across the heater It should be approximately 0 VAC i If itis not then most likely the triac Q2 is bad and the POWER SUPPLY board will have to be replaced 2 Check Temperature Probe Problem Step 4 Problem C Unstable Temperature Control or Display 1 Use gable cover provided to improve temperature control Problem B Constant Heat 2 control is stable but not at desired u temperature then check temperature 1 Bathis heating when it is not requesting heat calibration Re adjust if necessary a Selecta setpoint temperature atleast 10 Check Temperature Probe Problem A Step 4 below the actual temperature The bath should not be requesting heat as indicated by the HEATER ON indicator lamp on the front panel It should NOT be on continuously or even flashing b Measure the voltage at U1 PIN 2 with respect to TP2 COM It should be no less than 4 VDC Referto Figure 1 on page 13 P N 3177890 11 Problem D Display Reads UUUU The control boards have the ability to detect an OPEN or SHORTED temperature sensor These two conditions are shown on the display as follows DISPLAY CONDITION LLLI SHORT CIRCUIT ri l p OPEN CIRCUIT Before coming to the conclusi
12. capable of reading 120 volts f Measure the voltage between U1 PIN 4 and U1 PIN 6 It should be less than 1 VAC 9 lfitisnot then mostlikely the opto coupler U1 is bad and POWER SUPPLY board will have to be replaced If it is continue on h Measure the voltage directly across the heater It should be line voltage 110VAC to 120 If it is not then most likely the triac Q2 is bad and the POWER SUPPLY board will have to be replaced 6 Check heater a Disconnect the bath from its electrical supply Isolate the heater from any circuitry by disconnecting one of the heater leads Using an ohmmeter check the heater resistance Appropriate heater resistance values are listed below If the resistance reads 0 or infinity then replace the heater 115 VOLT 230 VOLT Model 2864 2865 15 OHMS 60 OHMS Model 2866 2867 10 5 40 Model 2868 2869 10 OHMS 40 OHMS d Check the resistance between the heater leads and ground green wire If the resistance reads 0 ohms replace the heater c Measure the DC voltage across R4 The voltage should be approximately zero volts d If the last two steps are NOT as stated then most likely the CPU boardis bad and it will have to be replaced otherwise continue on e Switch the voltmeter to an AC volts scale capable of reading 120 volts f Measure the voltage between U1 PIN 4 and U1 PIN 6 Itshould be line voltage 1 10 VAC to 120 VAC
13. overvoltage is 2500V for a 230V supply and 1500V for a 120V supply 2 Pollution Degree describes the amount of conductive pollution present in the operating environment Pollution Degree 2 assumes that normally only non conductive pollution such as dust occurs with the exception of occasional conductivity caused by condensation Maximum performance is assured across the following temperature range e 15 C to 45 C Electrical Connections IMPORTANT For personal safety this apparatus must be properly grounded 1 power cord provided on this unit is equipped with a three prong grounding plug which mates with standard three prong grounding wall receptacle to minimize the possibility of electric shock hazard from this apparatus If in doubt the user should have the wall receptacle and circuit checked by a qualified electrician to make sure the receptacle can provide adequate current and is properly grounded 2 Where standard two prong wall receptacle is encountered itis the personal responsibility and obligation of the user to have it replaced with a properly grounded three prong wall receptacle Do not under any circumstances cut or remove the third ground prong from the power cord Do not use a two prong adapter plug Determine the total amount of current being used by other apparatus connected to the circuit that will be used for this apparatus It is critical that the added current demand see nameplat
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15. CHAMBER AND NOT ON THE BATH SURFACE THE COVER SHOULD BE PLACED UPSIDE DOWN WHEN REMOVED TO MAINTAIN A DRY WORK AREA CAUTION WHEN OPERATING AT TEMPERATURES GREATER THAN 60 C DO NOT TOUCH THE METAL SURFACE OF THE GABLE COVER LIFT THE GABLE COVER BY THE KNOB ONLY WARNING EXPLOSION IMPLOSION OR THE RELEASE OF TOXIC OR FLAMMABLE GASES ARISING FROM THE MATERIAL BEING HEATED IS THE SOLE RESPONSIBILITY OF THE USER Cleaning Stainless steel will resist corrosion however it is not impervious to it Proper maintenance of the stainless steel bath chamber will help ensure many years of service CAUTION AVOID SPILLING HARSH CHEMICALS ONTO THE BATH AS CORROSION OF THE STAINLESS STEEL MAY RESULT IMPORTANT THE USER HAS THE RESPONSIBILITY FOR PERFORMING APPROPRIATE DECONTAMINATION IF HAZARDOUS MATERIAL IS SPILT ON OR INSIDE THE BATH It should be cleaned regularly with mild soapy water and rinsed with distilled water Should algae or other undesirable microorganisms form on the top of the bath media add a little formaldehyde or quaternary ammonium germicide available from Thermo P N 3166250 CAUTION DO NOT USE OTHER CLEANING OR DECONTAMINATION METHODS WITHOUT FIRST CONTACTING TECHNICAL SERVICES TO CHECK THAT THE PROPOSED METHOD WILL NOT DAMAGE THE EQUIPMENT IMPORTANT IFITIS NECESSARY TO USE THE FOLLOWING CHEMICALS LIMIT THE TIME TO A MAXIMUM OF FOUR HOURS CLEAN SURFACES IMMEDIATELY AFTER U
16. DISPLAY WILL SHOW ACTUAL BATH TEMPERATURE 18 REPLACEMENT PARTS LIST Model 2864 2865 Model 2866 2867 Model 2868 2869 3166680 3166682 3166684 3166685 3166681 3166683 120V 240V 120V 240V 120V 240V Bath Pan Kit 3167140 3167141 3167142 3164495 3164479 3164500 3167138 3167139 3167136 3167137 3167136 3167137 3176698 3176699 3176698 3176699 3176698 3176699 O Ring Kit Water Bath 3167129 Tubing Kit 3167145 Hi Limit Thermostat Kit 3167143 3177575 3173907 3177575 3173907 3177575 3173907 3178034 3179481 3178034 3179481 3178034 3179481 N 3179502 N A 3179502 N A 3179502 N 3175930 N A 3175930 N A 3175930 includes Nut amp O Ring ACCESSORY PARTS LIST 3166680 3166682 3166684 3166685 3166681 3166683 Cover Gable 3166565 3166208 3166230 3172449 3175950 3175950 Kit Water Level Regulator 3166223 Sanitizer Oakite 3166250 Diffuser Shelf Raised 3165861 P N 3177890 19 ASSEMBLY AND SCHEMATIC DRAWINGS 10150719 ly 3sn pe 4909 0 1 0 04102 19 09 0 09 99810 8 M9J9S 519 44 s d N 104109 01 889298 10 gt 3196 N3do 43409 1OHLNOO 401 ASLL INN 01808 101294005 19458 901 1939018 e dsi INN SS UJEH 9 JOUSEAA 181 1 5
17. Used Press Set Point Display Not Used Press Set Point LOW TEMP CALIBRATION LITTLE c Factory Setting Press Set Point HITEMP CALIBRATION BIG C Factory Setting Press Set Point Configuration is now complete Calibration of the low and high end of the sensor input is done at the factory Field calibration of the sensor may be performed using the following technique Enter the configuration routine and press the top left switch until a little c is displayed Add water that is around 10 to the bath completely covering the sensor Insert a calibrated thermometer After the thermometer stabilizes match the display setting to the thermometer reading by pressing the UP or DOWN push button switch Press the top left switch The readout will now display a big C Item Remove water from the bath add hot water of about 70 80 After the unit stabilizes match readout display to temperature on thermometer and press the top left switch Calibration is now complete Note When replacing CPU printed circuit board reprogramming may be necessary Follow thoroughly instructions provided with the replacement circuit board P N 3177890 17 TEMPERATURE CALIBRATION The following instructions provide a step by step procedure for temperature calibration Do not deviate from the procedure or the calibration of your bath may be inaccurate CAUTION THIS PROCEDURE SHOULD ONLY BE PERFORMED AFTER INSTALLIN
18. 10 OGOO000 J104 49 JeploH 1919 0UJ9U 9196 Ajddns Jamo dung ued J81e9H 21 P N 3177890 LAN N3dO H3AOO TOH INOO 401 HOLO3NNOO SSN LAN H3HSVMMDOl Lyd 5 m 1 gj v Quogyooocg Alddfl 9 1 N T HERAA SEU dalv3H PN 5 HALSWOWHSHL MIYOS SNIVN HAMOd 22 P N 3177890 Thermostat Screw Cap Screw
19. 66 2867 2868 2869 P N 3177890 50 60 1050 50 60 1050 3166682 3166684 3166685 3166681 3166683 PERFORMANCE DATA The following table identifies the specifications for the Circulating Baths Cover Model Model Model 2864 2865 2866 2867 2868 2869 INSTALLATION WARNING INSTALLATION SHOULD BE COMPLETED BY QUALIFIED PERSONNEL ONLY Location The most uniform operating conditions will be obtained by placing the bath on a level surface in an area remote from drafts ventilating outlets radiators and other rapidly changing ambient conditions Environmental Conditions This instrument is designed to operate safely under the following conditions Indoor Use Only e Temperature 5710 40 C Maximum Relative Humidity 80 to 31 C decreasing linearly to 50 at 40 C Maximum Altitude 2000 meters Mains supply voltage fluctuation 10 or per project plan Installation Overvoltage Category 1 Pollution Degree 2 1 Installation category overvoltage category defines the level of transient overvoltage which the instrument is designed to withstand safely It depends on the nature of the electricity supply and its overvoltage protection means For example in CAT II which is the category used for instruments in installations supplied from a supply comparable to public mains such as hospital and research laboratories and most industrial laboratories the expected transient
20. FORMED BY A QUALIFIED TECHNICIAN BEFORE REPLACING ANY ELECTRICAL MECHANICAL COMPONENTS UNPLUG THE LINE CORD IF ELECTRICAL POWER 15 REQUIRED FOR SERVICE USE EXTREME CARE Referto Problems and Solutions fortroubleshooting information on the baths This guide provides the basic information required to repair the bath The following is a list of the tools and instruments required to perform the procedures outlined in the Troubleshooting Procedures table Tools Needed Phillips or Flat Blade Screwdriver 7 16 Socket or adjustable wrench Ohmmeter DC Voltmeter AC Voltmeter 5VDC Power Supply When changing circuit boards please use CAUTION when re installing the flat cable connectors that come from the display board Make sure the pins are NOT bentor broken Boards that are otherwise fine will not operate correctly if these pins have been abused because they will not receive the necessary signals from other boards Before attempting any troubleshooting for a particular problem it is good practice to verify power supply voltages of the POWER SUPPLY board 3176677 Read these steps before performing them to get acquainted with the procedure Refer to Figure 1 on page 13 1 sure that the main power source is OFF or disconnected 2 Connect J101 and J105 to the POWER SUPPLY BOARD DO NOT connect J102 that comes from the CPU and the DISPLAY at this time 3 Connect the negative lead of the vo
21. G A NEW TEMPERATURE PROBE INTO THE BATH 1 Connect the temperature probe connector to J302 on CPU board 2 Turn Power switch to the OFF position 3 Pressandholdthe SETPOINT key whileturning Power ON 4 Theunitwill now cycle through an LED display test Press SETPOINT to end test 5 Thedisplay will now read 0000 Press UP until display reads 0012 Press SETPOINT NOTE IF A VALUE OTHER THAN 0012 IS DISPLAYED AND SETPOINT IS PRESSED THE UNIT WILL RETURN TO NORMAL OPERATING MODE AND DISPLAY WILL SHOW ACTUAL BATH TEMPERATURE 6 The unit is now in Calibration mode Raw count value appears Hit setpoint P N 3177890 7 The display will now show cXX X XX X is the actual bath temperature this is Low Temperature Calibration 8 Place the temperature probe and a calibrated referencethermometer into an ice bath Press UP or DOWN until the display value matches the reference thermometer Press SETPOINT to store the new low temperature calibration value 9 Thedisplay will now show CXX X this is High Temperature Calibration XX X is the actual bath temperature 10 Placethe temperature probe and acalibrated reference thermometer into a steaming water bath Press UP or DOWN until the display value matches the reference thermometer Press SETPOINT to store the new high temperature calibration value NOTE PRESSING OFFSET AT ANY TIME DURING THE CALIBRATION PROCESS WILL RETURN UNIT TO NORMAL OPERATION MODE AND
22. Installation Service Manual Circulating Water Baths Models 260 2864 2865 265 2866 2867 270 2868 2869 PRECISION Thermo Scientific 401 Millcreek Road Box 649 Marietta Ohio 45750 USA Phone 740 373 4763 Toll Free 800 438 4851 FAX 740 373 4189 Manual P N 3177890 Rev Dated 01JAN10 THE 230V UNITS DESCRIBED IN THIS MANUAL WERE DESIGNED SPECIFICALLY FOR THE EUROPEAN MARKET AND ARE SUPPLIED WITH A EUROPEAN STYLE POWER CORD FOR DOMESTIC USE A U S STYLE POWER CORD P N 3176836 MUST BE ORDERED SEPARATELY NOTICE THE MATERIAL IN THIS MANUAL IS FOR INFORMATION PURPOSES ONLY THE CONTENTS AND THE PRODUCT IT DESCRIBES ARE SUBJECT TO CHANGE WITHOUT NOTICE THERMO SCIENTIFIC MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THIS MANUAL INNO EVENT SHALL THERMO BE LIABLE FOR ANY DAMAGES DIRECT OR INCIDENTAL ARISING OUT OF OR RELATED TO THE USE OF THIS MANUAL For repair information or replacement parts assistance from the manufacturer call Technical Services using our toll free telephone number 800 438 4851 FAX 740 373 4189 REVISION STATUS INDEX DATE AMENDED PAGES NOTES Initial release 16 Update pump assembly kit numbers new pumps 6 Add caution acidic amp caustic substance 5 8 27 Add inlet screen info correct wire color 36100125 34002503 new manual manufacture location ECR 23196 BA 612 modified drain assembly connection to H20 regul
23. N TAPE OH EQUIVALENT SEALER 4 Tighten elbow connector so open end tube fitting faces straight down 5 Place Water Level Regulator Bracket Assembly on the lip of the bath pan drain side of the bath towards the rear of the unit The small flange with gasketing near the top of the bracket should rest against the inside of the bath pan The other 2 flanges with gasketing should rest against the outside of the bath body 6 Insert the plastic tubing coming from the bottom of the water level regulator into the elbow connector at the drain amp tighten the elbow connector fitting firmly to insure a good seal 7 Uncoil Tygon tubing press onto 1 4 Hose Barb Fitting located at the top of water level regulator Hose clamps are provided to ensure a good seal 8 Hook upother end of the tygon tubing to water supply amp turn on water Water pressure should fall within the following range MIN is approx 15 PSI MAX is approx 75 PSI WATER LEVEL REGULATOR NOTE WATER LINE MARKING ON THE WATER LEVEL REGULATOR IS AN INDICATOR OF THE APPROXIMATE WATER LEVEL THAT WILL BE MAINTAINED IN BATH THE ASSEMBLY HAS BEEN SET TO MAINTAIN APPROXIMATE 1 3 4 OF WATER TO RAISE THE SET WATER LEVEL LOOSEN THUMBSCREW amp RAISE WATER LEVEL REGULATOR TO DESIRED LEVEL COINCIDE WITH WATER LINE MARK amp TIGHTEN THUMBSCREW TO HOLD WATER LEVEL REGULATOR IN PLACE NOTE DO NOT OVER TIGHTEN THUMBSCREW P N 3177890
24. SE Barium Chloride Calcium Chloride Chlorinated Lime Dakin s Solution Aluminum Chloride Bichloride of Mercury Carbolic Acid Citric Acid boiling Ferrous Chloride Mercury Salts LysolMercuric Chloride Phenol Potassium Permanganate Tartaric Acid Potassium Thiocyanate Stanous Chloride Sodium Hypochlorite P N 3177890 CAUTION NEVER USE THE FOLLOWING CHEMICALS Aqua Regia Ferric Chloride lodine Sodium Azide Sulfuric Acid Removing Discoloration Should the stainless steel ever become discolored by iron rust use the following procedure to remove all traces of the rust and restore the stainless steel WARNING OBSERVE THE FOLLOWING SAFETY PRECAUTIONS USE HEAVY GLOVES OTHER ADEQUATE HAND PROTECTION WEAR GOGGLES OR OTHER ADEQUATE EYE PROTECTION ONLY WORK IN AREAS WITH ADEQUATE VENTILATION Prepare a solution of 20 nitric and 1 596 hydrochloric acid if preferred a 296 to 596 solution of warm oxalic acid may be used Swab solution over surface allowing it to remain until all rust is loosened This will usually take 1 to 2 minutes As soonasrustis loosened immediately flush with clean water until all acid is removed Screen assembly option If this optionis installed inspect daily and remove any debris from the screen Periodic Safety Check Test the operation of the Hi Limit thermostat as described on page 6 every three months TROUBLESHOOTING WARNING SERVICE SHOULD BE PER
25. SUPPORT THE WEIGHT OF THE UNIT WHEN FILLED WITH WATER P N 3177890 1 UNPACKING AND DAMAGE Save all packing material until unit is put into service This merchandise was carefully packed and thoroughly inspected before leaving our factory Responsibility for safe delivery was assumed by the carrier upon acceptance of the shipment therefore claims for loss or damage sustained in transit must be made upon the carrier by the recipient as follows 1 Visible Loss or Damage Note any external evidence of loss or damage on the freight bill or express receipt and have it signed by the carrier s agent Failureto adequately describe such external evidence of loss or damage may result in the carrier s refusing to honor your damage claim The form required to file such claim will be supplied by the carrier 2 Concealed Loss or Damage Concealed loss or damage means loss or damage which does not become apparent until the merchandise has been unpacked and inspected Shouldeither occur make a written request for inspection by carrier s agent within fifteen 15 days of the delivery date then file a claim with the carrier since the damage is the carrier s responsibility If you follow the above instructions carefully we will guarantee our full support of your claim to be compensated for loss or concealed damage DONOT FOR ANY REASON RETURN THIS UNIT WITHOUT FIRST OBTAINING AUTHORIZATION In any correspondence to Thermo
26. aced 4 Check temperature probe a Measure the bath water temperature and make note of it Make sure it will not change drastically during this check b With a DC voltmeter measure the supply ofthe temperature sensor at J302 pins 1 amp 3 It should be approximately 5 volts If it is then continue on to step C If not see Step 3a P N 3177890 10 c Measure the output of the temperature sensor at J302 pins 2 amp 3 Pin 3 being the reference or ground The output relationship of voltage to C is listed in the table below Compare the measured voltage to the temperatures listed to determine if the probe is working The bath is not heating when it should be requesting heat Voltage measurements are made on the POWER SUPPLY BOARD 3176677 Refer to Figure 1 on page 13 a Select a setpoint temperature at least 10 above what the actual temperature is The bath should be requesting heat as indicated by the heater ON indicator lamp on the front panel It should be on continuously not flashing b Measure the voltage at U1 PIN 2 with respect to TP2 COM It should be no greater than 4 VDC c Measurethe DC voltage across R4 Since the bath is requesting heat there should be current flowing through this resistor making the voltage drop equal to 3VDC 05 d Ifthelasttwo steps are notas stated then most likely the CPU boardis bad andit will have to be replaced e Switch the voltmeter to an AC volts scale
27. ator ECR 23443 consolidated with 230V 3177687 removed CE symbol and declaration ECR 24808 Revised water specifications ECR 25448 BA 670 Added UL required information ECR25227 BA 667 page 22 half coupling ECR25432 BA 676 CPU board illustrations pgs 13 amp 14 ECR25572 BA 673 thermal cutout sw in heater circuit rev schematics Contents INTRODUCTION eases M 1 UNPACKING AND DAMAGE 1 GENERAL INFORMATION 2 PERFORMANCE nicssistknisus Ele adi d xvii PEINE DONNA HM NER ER E 2 INSTALLATION P M 2 WATER LEVEL 3 EXPLANATION CONTROLS a 6 55555 7 MAINTENANCE Ein uc ER UN MR 8 TROUBLESHOOTING roov nixa tct tct lk nk v 8 PARTS REPLACEMENT mex 13 TEMPERATURE CALIBRATION sc 16 REPLACEMENT PARTS dra ERE n AR n Dora
28. e Reverse above procedure to install new temperature sensor Recalibrate new temperature sensor See Temperature Calibration on page 15 P N 3177890 15 PARTS REPLACEMENT CONT D Replace Heater From inside control housing remove 2 nuts and disconnect wires from heater leads Remove two hex nuts from heater ends using a 13 16 socket andremove heater Reverse above procedure to install new heater Replace HI LIMIT Remove four leads from thermostat terminals Thermostat Remove two screws from thermostat bracket and remove bracket Carefully tilt bath on its side Remove eight screws from bottom plate and remove plate Remove insulation from bottom of pan and between pan and control panel wall Loosen two nuts from thermostat bulb bracket Carefully remove thermostat from control housing by sliding bulb through hole in control panel wall Reverse above procedure to install new Hi Limit thermostat Use extreme care when installing new thermostat A sharp bend in the thermostat capillary will crimp off flow of hydraulic fluid Replace Power Supply Remove connectors 101 J102 J103 and J105 from board Board Use extra care when removing J102 so as not to bend connector pins Remove five nuts from board and then remove it Reverse above procedure to install new power supply board Replace CPU or Remove connectors J302 and J303 from CPU board Display Keyboard Board Remove connector J102 fro
29. e of this and other equipment used on the same circuit does not exceed the rating of the fuse or circuit breaker CAUTION The power supply must be the same voltage as specified on the nameplate The power cord is the MAINS disconnect Be sure that it is easily reached to disconnect the unit from the power source To avoid build up of mineral deposits and prevent corrosion use only distilled water in the bath Using chlorinated tap water or additives that contain chlorine will void the manufacturer s warranty Similarly high purity deionized water that does not fall into the 50K to 1M ohm range and 7 to 9 pH range will also void the warranty Contact Technical Services with any questions P N 3177890 3 Electrolysis can damage stainless steel This can occur if an object is allowed to rest directly on the surface trapping moisture that becomes oxygen starved but is surrounded by water containing oxygen The resulting electrolytic action will pit or erode the stainless steel WATER LEVEL REGULATOR OPTIONAL INSTALLATION INSTRUCTIONS Use the following steps along with Figure 1 and 2 shown on the following page 1 Turn off unit disconnect power amp drain water from the bath Unscrew drain plug from side of bath body 3 Replace with elbow connector and reducing bushing shipped loose Note the reducing bushing is used on units built after February 2006 NOTE TO INSURE GOOD SEAL WRAP THREADS WITH TEFLO
30. gher operating stress than other components Ifthe bath starts experiencing temperature problems such as no heat or creeping upward heat then follow the troubleshooting instructions below These instructions require the use of a voltmeter being able to measure DC and AC voltages preferably digital and an ohmmeter WARNING THE FOLLOWING TROUBLESHOOTING INSTRUCTIONS REQUIRE THAT POWER BE ON ONLY QUALIFIED SERVICE PERSONNEL SHOULD PERFORM THESE PROCEDURES Open the control cover and familiarize yourself with the POWER SUPPLY assembly 3176677 Locate the triac Q2 the opto isolater U1 the resistor R4 and the test point 2 TP2 COM The first measurements will be DC voltage measurements A DC scale of at least 10 volts should be selected PROBLEMS amp SOLUTIONS kkkkkkkkkkk kkkkkkkkkkkkk Problem A No Heat 1 Verify that the setpoint temperature is greater than the actual water temperature 2 Verifythatthe HIGH TEMP lightis OFF Ifthe light is ON turn the HIGH LIMIT CONTROL fully clockwise 3 Check temperature probe voltage reference These measurements are on the CPU board 3176678 Refer to Figure 2 on page 14 a Place the negative lead of a DC voltmeter on TP1 COM test point Measure the voltage at U7 pin 2 It should be approximately 14 volts DC Now measure the voltage at U7 Pin 6 It should be approximately 5 volts DC If the 14 volts is present but not the 5 volts the CPU board must be repl
31. ltmeter to TP2 COM Selecta VDC of 20 Connect the positive lead to TP1 UNREG 4 Turn ON the main power 5 Thevoltmetershould be reading approximately 14 volts DC 2 6 Connect the positive lead to TP3 5V The voltmeter should be reading 5 volts DC 0 5 7 Turn OFF main power 8 Connectthe display board ribbon connector to P N 3177890 9 the power supply board at J102 and then repeat steps 3 thru 6 Do not connect the connector to the CPU board at this time If the above voltages are not measured again the display board has a bad component which is loading down the voltages If the voltages are still present continue on to step 9 9 Connectthe display board ribbon connector to the CPU board J310 and repeat steps 3 thru 6 Ifthe above voltages are not measured again the CPU board has a bad component which is loading down the voltages This board will have to be replaced GENERAL INFORMATION The POWER SUPPLY PCB ASSEMBLY 31 76677 hasthetriac solid state AC voltage switch on it which supplies the power to the heater This triac is told to operate when need be by the microprocessor There is another device known as an opto coupler which serves as the high low voltage isolator between the triac and the microprocessor When the bath starts experiencing temperature problem and or variations due to known controller malfunctioning these two components become prime suspects The reason being they are under hi
32. m power supply board Use See note on the extreme care when removing J102 so as not to bend following page connector pins 3 Remove four nuts from CPU board and remove CPU board and Keyboard Display board 4 Remove J201 from CPU board Use extreme care when removing J301 so as not to bend connector pins Remove board 5 Reverse above procedure to install new board P N 3177890 16 PARTS REPLACEMENT CONT D Replace CPU or 6 The software must be configured to match the Bath model Display Keyboard Board To enter configuration mode press the upper left pushbutton See note below switch while applying power The upper left switch is labeled Set Point This switch is used to enter configuration codes and steps through the different levels of configurations When a triangle is shown in the chart the pushbutton is to be depressed once for each symbol Immediately following power up with the switch depressed the readout will display a 3 digit number This is the software revision The readout will then begin to do a self test of digits Press the Set Point button once The readout will display 0000 Follow the listing below to complete the configuration Enter 37 using up down arrows Press Set Point Enter 31 using up down arrows Press Set Point Enter 2 0 using up down arrows Press Set Point Enter 500 using up down arrows Press Set Point Enter 1 using up down arrows gt Press Set Point Display Not
33. on that the probe is bad when one of these displays appear check the connection of the probe to the circuit board for polarity and alignment Problem E Display Reads all Eights 8888 1 The most common problem cause of this problem is the failure of the driver integrated circuit on the DISPLAY KEYBOARD board 3176679 Replace it P N 3177890 12 Problem F Pump Does Not Circulate Water Verify that the water level is above both the pump inlet and outlet If the pump is not running verify that power is applied to the bath If power is present check wiring of pump to power switch If wiring is correct replace the pump If pump is running but water is not circulating open the control panel and gently squeeze the long piece of rubber tubing a few times to help remove any air trapped within the pumping system If water is still not circulating check for foreign matter in the pump inlet fitting 8 lt 5 no p uid ors nm 6 52 ol LB i Ole 40 NO S bo 2 9 OO 5 LN 2 3 zc a 018 015 1 oo amp 5 L cer oooooo 13 1 JLL J9MOd punouo JojeoH 9pAZ
34. ow for appropriate replacement procedures Failure to follow parts replacement procedures may cause damage to the bath WARNING BEFORE REPLACING ANY PART TURN POWER SWITCH TO OFF THEN UNPLUG THE UNIT FROM ITS POWER SOURCE SERVICE SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN CAUTION WHEN REPLACING TEMPERATURE SENSOR HEATER OR CIRCULATING PUMP MAKE SURE ALL SEALS ARE WATERTIGHT BEFORE APPLYING ELECTRICAL POWER PARTS REPLACEMENT NOTE For easiest access to the control housing place bath on the edge of a bench or table Remove four screws on upper side of control housing and carefully lower hinged control panel ition to the vertical Circulating Pump Replacement Drain water from bath Remove the two pump leads attached to power switch and green wire from pump to ground lug Loosen the two visible hose clamps with a screwdriver remove tubing from pump Disconnect pump from pump bracket by removing two screws and remove pump from bath Reverse above procedure to install new circulating pump Replace Temperature Sensor Drain water from bath Remove diffuser pan from bath Remove connector J302 from CPU board Remove temperature sensor fitting from inside bath pan Hold small nut on fitting firmly with a wrench Remove large fitting piece with another wrench Remove rubber grommet from temperature sensor Carefully slide sensor through the control housing remov
35. please supply the nameplate data including catalog number and serial number GENERAL INFORMATION Precision Circulating Baths are widely used in research and quality control Their superb temperature uniformity and stability makes them especially desirable for legal or reference tests The microprocessor control panel houses all functions necessary to operate the bath The 5 push button switches and single digital display window allow the operator to adjust bath temperature and temperature calibration via a single set of controls The proportional integral temperature control coupled with agitation supplied by a centrifugal pump located in the control housing allows precise temperature control Use ofthe gable cover provided is required to maintain optimal temperature sensitivity A high limit thermostat is provided and can be set to prevent heater runaway in the event of temperature control failure The interior of the bath is constructed of stainless steel and is designed for operation with distilled water or water solutions such as water ethylene glycol with corrosion inhabitants added The body is made from galvanized steel and is painted for added protection A drain is located at the far left hand end of the bath A stainless steel gable cover is also provided with the bath The 240 volt units are identical in appearance to the 115 volt units Listing of Models Included In This Manual Category 3166680 2864 2865 28
36. setpoint b Press UP or DOWN until the desired temperature setpoint is displayed Press ENTER to store the new value d Display will return to actual temperature e IfENTERisnotpressed new value will not be set and display will return to actual temperature P N 3177890 7 4 To adjust temperature offset a Temperature offset should be used to match a stable bath s actual temperature display to a calibrated thermometer b Press ENTER until actual temperature is displayed c While pressing OFFSET press UP or DOWN until display shows the DIFFERENCE between displayed temperature and reference thermometer Continue holding offset and press ENTER to set new value d Display should now match your calibrated thermometer e IfENTERisnotpressed new value will not be set and display will return to previous actual temperature f Example Setpoint is 37 and actual bath temperature display is stable at 37 Calibrated reference thermometer reads 37 29 Press OFFSET and UP until display reads 2 Press ENTER while still holding OFFSET key Release keys Actual bath temperature will read 37 29 Readjust setpoint to 37 by repeating step 3 NOTE AS WATER BATHS OPERATED ESPECIALLY AT ELEVATED TEMPERATURES CONDENSATION WILL FORM ON THE UNDERSIDE OF THE GABLE COVER THE AMOUNT OF CONDENSATION CAN BE CONSIDERABLE CARE SHOULD BE EXCERCISED WHEN REMOVING THE COVER SO THAT WATER WILL FALL BACK INTO THE BATH
37. w set point value 7 Offset Key The Offset Key is used to adjust the actual temperature value to match a calibrated reference thermometer OPERATION CAUTION EXERCISE CARE WHEN USING ACIDIC OR CAUSTIC SOLUTIONS AS THEY WILL ATTACK THE GALVANIZED STEEL BATH BODY IF SPILLED INTO THE BATH IF SPILLS DO OCCUR THE BATH LIQUID SHOULD BE IMMEDIATELY DRAINED AND THE UNIT THOROUGHLY FLUSHED SPILLS AND CONDENSATION SHOULD BE CLEANED REMOVED FROM ALL METAL SURFACES AFTER EACH USE When filling the bath with water allowance mustbe madeforthe displacementof water upon immersion of samples CAUTION WATER LEVEL REQUIREMENTS MINIMUM LEVEL WATER LEVEL SHOULD BE 112 INCHES ABOVE THE PUMP OUTLET THIS WILL KEEP THE PUMP FROM RUNNING DRY AND FAILING TO OPERATE MAXIMUM LEVEL WATER LEVEL SHOULD NOT BE HIGHER THAN 1 INCH FROM THE TOP OF THE BATH PAN To conserve energy reduce evaporation and increase temperature control accuracy use the gable cover provided Do not use aluminum foil as a cover as it may cause corrosion due to an electrochemical reaction 1 Adddistilled waterto bath Use water levels as instructed above 2 Powerup Depress the power switch located atthe lower right hand corner of the bath The unit is fully operational upon application of power and the display will read actual bath temperature 3 To set temperature control point a Press SETPOINT The display will now show the current temperature
38. will be OFF Turn the potentiometer counter clockwise until the Hi Limit light is ON and thenadjust clockwise 1 8 of aturn Verify that the Hi Limit light is OFF Now if your bath temperature rises above the desired setting the Hi Limit protection will be activated Circulating Water Bath Control Panel The Control panel is located ontop ofthe bath and provides pri mary tempera ture control The Control Panel contains the fol lowing features See Figure A Heater On Set Point To adjust temperature Press Set Point Press W until value is displayed Press ENTER to store the new value P N 3177890 FIGURE A 1 LED Display 4 digit display used to show both actual and set point values for the temperature Also shows configuration parameters when in configuration mode 2 Heater on Lamp the Heater on Lamp is lighted when power is applied to the heating element 3 Indicator Lamps These lamps indicate which parameter Actual Temp or Setpoint Temp is displayed in LED window 4 Set Point Key The Set Point Key is used to toggle the display between actual bath temperature and the setpoint value 5 Temperature Selection Keys The Temperature Selection Keys are used to select the de sired tempera ture setpoint value and Bath Temp C are only active aftertheSet Point Set Point Key has been pressed 6 Enter Key The Enter Key is used to store a ne
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