401 Millcreek Road, Box 649Marietta, Ohio 45750USAPhone: 740-373-4763Toll Free: 800-438-4851FAX: 740-373-4189

Manual P/N 3177876Rev.K Dated 21MAY09

Installation/Service ManualColiform Incubator BathModel 2862/2863 (253)

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Hig h Temp .

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NOTICE

THE MATERIAL IN THIS MANUAL IS FOR INFORMATION PURPOSES ONLY. THECONTENTS AND THE PRODUCT IT DESCRIBES ARE SUBJECT TO CHANGE WITHOUTNOTICE. THERMO SCIENTIFIC MAKES NO REPRESENTATIONS OR WARRANTIES WITHRESPECT TO THIS MANUAL. IN NO 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

NOTE:

THE 240V UNITS DESCRIBED IN THIS MANUAL WERE DESIGNED SPECIFICALLY FORTHE EUROPEAN MARKET AND ARE SUPPLIED WITH A EUROPEAN STYLE POWERCORD. FOR DOMESTIC USE, A U.S. STYLE POWER CORD (P/N: 3176836) MUST BEORDERED SEPERATELY.

INDEX DATE NOTES

REVISION STATUS

Initial release

Update pump assembly kit numbers(new pumps)

Add caution "acidic & causticsubstance

Add inlet screen info, correct wire color

Update performance specs, addchamber dimensions

New manual #, manufacture location

Modified drain assembly (connectionto H20 regulator)

consolidated with 3177688, removedCE symbol and declaration

Revised water specs

UL information

page 24 - half coupler

A

B

C

D

E

F

G

H

I

J

K

AMENDED PAGES

6/99

5/00

11/01

4/02

3/03

4/05

4/06

6/06

9/08

4/09

5/09

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16

6

5, 8, 27

2

Manual P/N 31600111

ECR23196/BA-612

ECRs 23443 & 23496

ECR 24808

ECR25448/BA-670

ECR25227/BA-667

ContentsINTRODUCTION .............................................................................................................1

UNPACKING AND DAMAGE ..........................................................................................1

GENERAL INFORMATION..............................................................................................2

PERFORMANCE .............................................................................................................2

INSTALLATION ...............................................................................................................2

WATER LEVEL REGULATOR .......................................................................................3

EXPLANATION OF CONTROLS ....................................................................................6

OPERATION ....................................................................................................................7

MAINTENANCE...............................................................................................................8

TROUBLESHOOTING ....................................................................................................8

PARTS REPLACEMENT ..............................................................................................13

TEMPERATURE CALIBRATION ..................................................................................16

REPLACEMENT PARTS LIST .....................................................................................17

ASSEMBLY & SCHEMATIC DWGS .............................................................................19

WARRANTY ..................................................................................................................28

P/N: 3177876 1

INTRODUCTIONYour satisfaction and safety are important toThermo and a complete understanding of this unitis necessary to attain these objectives.

As the user of this apparatus, you have theresponsibility to understand the proper functionand operational characteristics of your bath. Thisinstruction manual should be thoroughly read andall operators given adequate training beforeattempting to place this unit in service. Awarenessof the stated cautions and warnings, and compliancewith recommended operating parameters —together with maintenance requirements — areimportant for safe and satisfactory operation. Theunit should be used as described and for its intendedapplication; alterations or modifications will VOIDTHE WARRANTY.

WARNINGAS A ROUTINE LABORATORY PRECAUTION,ALWAYS WEAR SAFETY GLASSES WHENWORKING WITH THIS APPARATUS.

This product is not intended, nor can it be used, asa sterile or patient connected device. In addition,this apparatus is not designed for use in Class I, IIor III locations as defined by the National ElectricalCode.

CAUTIONWHEN UNPACKING THIS PRODUCT, TWOPERSONS ARE REQUIRED TO LIFT THEWATER BATH AND PLACE IT ON A BENCH.

THE BENCH TOP MUST BE RIGID ANDSTRONG ENOUGH TO COMFORTABLYSUPPORT THE WEIGHT OF THE UNIT WHENFILLED WITH WATER.

UNPACKING AND DAMAGESave all packing material until unit is put intoservice. This merchandise was carefully packedand thoroughly inspected before leaving ourfactory.

Responsibility for safe delivery was assumed bythe carrier upon acceptance of the shipment;therefore, claims for loss or damage sustained intransit must be made upon the carrier by therecipient as follows:

1. Visible Loss or Damage: Note any externalevidence of loss or damage on the freight bill,or express receipt, and have it signed by thecarrier's agent. Failure to adequately describesuch external evidence of loss or damagemay result in the carrier's refusing to honoryour damage claim. The form required to filesuch claim will be supplied by the carrier.

2. Concealed Loss or Damage: Concealedloss or damage means loss or damage whichdoes not become apparent until themerchandise has been unpacked andinspected. Should either occur, make a writtenrequest for inspection by carrier's agent withinfifteen (15) days of the delivery date; then filea claim with the carrier since the damage is thecarrier's responsibility.

If you follow the above instructions carefully, wewill guarantee our full support of your claim to becompensated for loss or concealed damage.

DO NOT — FOR ANY REASON — RETURN THISUNIT WITHOUT FIRST OBTAININGAUTHORIZATION. In any correspondence toThermo, please supply the nameplate data,including catalog number and serial number.

P/N: 3177876 2

GENERAL INFORMATION

Precision Circulating Baths are widely used inresearch and quality control. Their superbtemperature uniformity and stability makes themespecially desirable for legal or reference tests.

The microprocessor control panel houses allfunctions necessary to operate the bath. The 4push-button switches and single digital displaywindow allow the operator to adjust bathtemperature and temperature calibration via asingle set of controls.

The proportional integral temperature controlcoupled with agitation supplied by a centrifugalpump located in the control housing allows precisetemperature control. Use of the gable coverprovided is required to maintain optimal temperaturesensitivity.

A high limit thermostat is provided and can be setto prevent heater runaway in the event oftemperature control failure.

The interior of the bath is constructed of stainlesssteel and is designed for operation with distilledwater or water solutions, such as water /ethyleneglycol with corrosion inhabitants added. The bodyis made from galvanized steel and is painted foradded protection. A drain is located at the far lefthand end of the bath. A stainless steel gable coveris also provided with the bath.

The 240-volt units are identical in appearance tothe 120-volt units.

PERFORMANCE DATAThe following table identifies the specifications forthe Coliform Baths.

Technical Specifications

Temperature Settings (factory preset) 35.0oC 41.5oC 44.5oC 45.5oCSensitivity (cover on) Uniformity (cover on) ±0.05°C ±0.05°C

Chamber SizeLength 27 inches (68.6cm.)Width 12 inches (30 cm.)Height 7.5 inches (19 cm.)

Capacity (1.5" from top) 9.1 gallons (34.5L.)

INSTALLATION

WARNINGINSTALLATION SHOULD BE COMPLETED BYQUALIFIED PERSONNEL ONLY.

Location - The most uniform operating conditionswill be obtained by placing the bath on a levelsurface in an area remote from drafts, ventilatingoutlets, radiators, and other rapidly changingambient conditions.

Environmental Conditions- This instrument isdesigned to operate safely under the followingconditions:

• Indoor Use Only• Temperature: 5° to 40° C• Maximum Relative Humidity: 80% for

temperatures to 22°C• Maximum Altitude 2000 meters• Mains supply voltage flucuation ±10, or per

project plan• Installation (Overvoltage) category II,

Pollution Degree 2

Table 1Listing of Models Included In This Manual

CatalogNumber Volts Hertz Watts Amps Mains Fuse Power Board

Fuse

3166678 120 50/60 1550 12.9 N/A N/A

3166679 240 50/60 1550 6.5 FST-5x20-10A FST-6.3x32-6.3mA

P/N: 3177876 3

1 Installation category (overvoltage category) definesthe level of transient overvoltage which the instrumentis designed to withstand safely. It depends on thenature of the electricity supply and its overvoltageprotection means. For example, in CAT II which isthe category used for instruments in installationssupplied from a supply comparable to public mainssuch as hospital and research laboratories and mostindustrial laboratories, the expected transientovervoltage is 2500V for a 230V supply and 1500V fora 120V supply.

2 Pollution Degree describes the amount of conductivepollution present in the operatingenvironment. Pollution Degree 2 assumes thatnormally only non-conductive pollution such as dustoccurs with the exception of occasional conductivitycaused by condensation.

Maximum performance is assured across thefollowing temperature range:

• 15ºC to 45ºC

Electrical Connections -

IMPORTANTFOR PERSONAL SAFETY, THIS APPARATUSMUST BE PROPERLY GROUNDED.

1. The power cord provided on this unit is equippedwith a three-prong (grounding) plug whichmates with a standard three-prong groundingwall receptacle to minimize the possibility ofelectric shock hazard from this apparatus. Ifin doubt, the user should have the wallreceptacle and circuit checked by a qualifiedelectrician to make sure the receptacle providesadequate current and is properly grounded.

2. Where a standard two-prong wall receptacleis encountered, it is the personal responsibilityand obligation of the user to have it replacedwith a properly grounded three-prong wallreceptacle. Do not, under anycircumstances, cut or remove the third(ground) prong from the power cord. Donot use a two-prong adapter plug.

Determine the total amount of current being usedby other apparatus connected to the circuit to beused for this apparatus. It is critical that the addedcurrent demand of this (see nameplate) and otherequipment used on the same circuit does notexceed the rating of the fuse or circuit breaker.

CAUTIONBE SURE THAT THE POWER SUPPLY IS THE SAMEVOLTAGE AS ON THE NAMEPLATE.THE POWER CORD IS THE MAINS DISCONNECT.MAKE SURE THE RECEPTACLE IS ALWAYS EASILYACCESSIBLE.TO AVOID BUILD-UP OF MINERAL DEPOSITS ANDTO PREVENT CORROSION, USE ONLY DISTILLEDWATER (50K OHM TO 1M OHM) IN THE BATH. USINGCHLORINATED TAP WATER OR ADDITIVESCONTAINING CHLORINE WILL VOID THEMANUFACTURER'S WARRANTY. SIMILARLY, HIGHPURITY (DEIONIZED) WATER THAT DOES NOT FALLWITHIN A 50K TO 1M OHM RESISTIVITY RANGE ANDA 7 TO 9 PH RANGE WILL ALSO VOID THEWARRANTY. CONTACT TECHNICAL SERVICESWITH ANY QUESTIONS.ELECTROLYSIS CAN DAMAGE STAINLESS STEELIF AN OBJECT IS ALLOWED TO REST DIRECTLY ONTHE SURFACE, TRAPPING MOISTURE THATBECOMES OXYGEN STARVED BUT ISSURROUNDED BY WATER CONTAINING OXYGEN.THE RESULTING ELECTROLYTIC ACTION WILL PITOR ERODE THE STAINLESS STEEL.

P/N: 3177876 4

NOTEWATER LINE MARKING ON THE WATERLEVEL REGULATOR IS AN INDICATOR OFTHE APPROXIMATE WATER LEVEL THATTO BE MAINTAINED IN BATH. THEASSEMBLY HAS BEEN SET TO MAINTAINAPPROXIMATELY 1-3/4" OF WATER. TORAISE THE SET WATER LEVEL, LOOSENTHUMBSCREW & RAISE WATER LEVELREGULATOR TO DESIRED LEVEL(COINCIDE WITH WATER LINE MARK) &TIGHTEN THUMBSCREW TO HOLDWATER LEVEL REGULATOR IN PLACE.

NOTE:

DO NOT OVER-TIGHTEN THUMBSCREW

WATER LEVEL REGULATOR(OPTIONAL)

INSTALLATION INSTRUCTIONS - Use thefollowing steps along with Fig. 1 & 2 shown on thefollowing page.

1. Turn off unit, disconnect power & drain waterfrom the bath.

2. Unscrew drain plug from side of bath body.

3. Replace with elbow connector and reducingbushing (shipped loose). Note the reducingbushing is used on units built after February2006.

NOTETO ENSURE A GOOD SEAL, WRAP THREADSWITH TEFLON TAPE OR EQUIVALENT SEALER.

4. Tighten elbow connector so open end (tubefitting) faces straight down.

5. Place Water Level Regulator BracketAssembly on the lip of the bath pan (drain sideof the bath towards the rear of the unit). Thesmall flange with gasketing near the top of thebracket should rest against the inside of thebath pan. The other 2 flanges with gasketingshould rest against the outside of bath body.

6. Insert the plastic tubing (coming from thebottom of the water level regulator) into theelbow connector (at the drain) and tighten theelbow connector fitting firmly to ensure a goodseal.

7. Uncoil Tygon tubing and press onto 1/4" HoseBarb Fitting (located at the top of water levelregulator). Hose clamps are provided to ensurea good seal.

8. Hook-up other end of the tygon tubing to watersupply and turn on water. (Water pressureshould fall within the following range: MIN isapprox. 15 PSI, MAX is approx 75 PSI)

P/N: 3177876 5

WATER LEVEL REGULATOR ASSEMBLY

FIGURE 2CUTAWAY FRONT VIEW OF BATH (120V UNITS)

FIGURE 1SIDE VIEW OF BATH (120V UNITS)

P/N: 3177876 6

FIGURE 1SIDE VIEW OF BATH (240V UNITS)

FIGURE 2CUTAWAY FRONT VIEW OF BATH (240V UNITS)

P/N: 3177876 7

INLET SCREEN ASSEMBLY(OPTIONAL)

An optional inlet screen assembly is packaged witheach unit. If used, this screen will filter foreignmaterials (i.e. pieces of paper) from being suckedthrough the pump. To install the screen assembly,refer to the diagram below.

NOTE:IF USED, THE SCREEN ASSEMBLY MUST

BE INSPECTED DAILY. REMOVE ANYDEBRIS FOUND ON THE SCREEN.

P/N: 3177876 8

2

3

4 5

1

1. LED Display - The three-digit LED display isused to show both the actual and set point values forthe temperature.

2. Heater On Lamp - The "Heater ON" lamp isilluminated when power is applied to the heater.

3. Calibrate - The Calibrate key is used to adjust theactual temperature value to match a calibratedreference thermometer.

4. Temperature Selection Keys - ("UP" or "Down")These keys are used to select one of the fourtemperature setpoints.

5. Enter Key - TheEnter Key is used tostore a new setpointvalue.

EXPLANATION OF CONTROLS

Power Switch - The power switch is located onthe lower right hand side of the bath, it providespower for the entire unit.

Hi-Limit Thermostat - The hi-limit thermostat islocated immediately to the left of the power switchon the lower right hand corner of the bath. Thehigh limit is an adjustable control used to preventthermal runaway in the event that the primarycontrol fails. After you have stabilized the bathtemperature, use a standard screwdriver to adjustthe potentiometer. When delivered, the Hi-Limit isturned fully clockwise (highest setting). In thisposition, the Hi-limit light will be OFF. Turn thepotentiometer counterclockwise until the Hi-Limitlight is ON, thenadjust clockwise 1/8 of a turn.Verify that the Hi-Limit light is OFF. Now if yourbath temperature rises above the desired setting,the Hi-Limit protection will be activated.

Control Panel - The control panel is located ontop of the bath and provides primary temperaturecontrol. The control panel contains the followingfeatures (See Figure A).

FIGURE A

P/N: 3177876 9

OPERATION

CAUTIONEXERCISE CARE WHEN USING ACIDIC ORCAUSTIC SOLUTIONS AS THEY WILL ATTACKTHE GALVANIZED STEEL BATH BODY IF SPILLEDINTO THE BATH. IF SPILLS DO OCCUR, THE BATHLIQUID SHOULD BE IMMEDIATELY DRAINED ANDTHE UNIT THOROUGHLY FLUSHED. SPILLS ANDCONDENSATION SHOULD BE CLEANED/REMOVED FROM ALL METAL SURFACES AFTEREACH USE.

When filling the bath with water, allowance must bemade for the displacement of water upon immersionof samples. Do not use deionized water. Seewater specs in CAUTION on Page 3.

CAUTIONWATER LEVEL REQUIREMENTS ARE -MINIMUM LEVEL - WATER LEVEL SHOULDBE 1 1/2 INCHES ABOVE THE PUMPOUTLET. THIS WILL KEEP THE PUMP FROMRUNNING DRY AND FAILING TO OPERATE.MAXIMUM LEVEL - WATER LEVEL SHOULDNOT BE HIGHER THAN 1 INCH FROM THETOP OF THE BATH PAN.

To conserve energy, reduce evaporation, andincrease temperature control accuracy, use thegable cover provided. Do not use aluminum foil asa cover, as it may cause corrosion due to anelectrochemical reaction.

1. Add distilled water to bath. Use waterlevels as instructed above.

2. Power up: Depress the power switchlocated at the lower right hand corner of thebath. The unit is fully operational uponapplication of power and the display willread actual bath temperature.

3. To set temperature control point:a. Press SETPOINT. The display shows the

current temperature setpoint.b. Press UP or DOWN until the desired

temperature setpoint displays.c. Press ENTER to store the new value.d. Display returns to actual temperature.

If ENTER is not pressed, new value will not be setand display will return to actual temperature.

4. To calibrate temperature display:a. Use a calibrated reference thermometer.b. Press CALIBRATE key.c. Press UP or DOWN to adjust display to

match thermometer.d. Press ENTER.e. Display should now match your calibrated

thermometer.

If ENTER is not pressed, new value will not be setand display will return to previous actualtemperature.

NOTEAS WATER BATHS ARE OPERATED,ESPECIALLY AT ELEVATED TEMPERATURES,CONDENSATIONWILL FORM ON THEUNDERSIDE OF THE GABLE COVER. THEAMOUNT OF CONDENSATION CAN BECONSIDERABLE. CARE SHOULD BEEXERCISED WHEN REMOVING THE COVERSO THAT WATER WILL FALL BACK INTOTHE BATH CHAMBER, AND NOT ON THEBATH SURFACE. THE COVER SHOULD BEPLACED UPSIDE DOWN WHEN REMOVEDTO MAINTAIN A DRY WORK AREA.

CAUTIONWHEN OPERATING AT TEMPERATURESGREATER THAN 60 ºC, DO NOT TOUCH THEMETAL SURFACE OF THE GABLE COVER. LIFTTHE GABLE COVER BY THE KNOB ONLY.

WARNINGEXPLOSION, IMPLOSION OR THE RELEASEOF TOXIC OR FLAMMABLE GASES ARISINGFROM THE MATERIAL BEING HEATED IS THESOLE RESPONSIBILITY OF THE USER.

P/N: 3177876 10

Removing Discoloration: Should the stainlesssteel ever become discolored by iron rust, use thefollowing procedure to remove all traces of therust and restore the stainless steel.

WARNINGOBSERVE THE FOLLOWING SAFETYPRECAUTIONS! USE HEAVY GLOVES OROTHER ADEQUATE HAND PROTECTION.WEAR GOGGLES OR OTHER ADEQUATE EYEPROTECTION. ONLY WORK IN AREAS WITHADEQUATE VENTILATION.

Prepare a solution of 20% nitric and 1.5%hydrochloric acid (if preferred, a 2% to 5% solutionof warm oxalic acid may be used). Swab solutionover surface, allowing it to remain until all rust isloosened. This will usually take 1 to 2 minutes.

As soon as rust is loosened, immediately flush withclean water until all acid is removed.

Screen assembly option: If this option is installed,inspect daily and remove any debris from thescreen.

Periodic Safety Check: Test the operation ofthe Hi-Limit thermostat, as described on page 7,every three months.

TROUBLESHOOTING

WARNINGSERVICE SHOULD ONLY BE PERFORMEDBY A QUALIFIED TECHNICIAN. BEFOREREPLACING ANY ELECTRICAL ORMECHANICAL COMPONENTS, UNPLUG THELINE CORD. IF ELECTRICAL POWER ISREQUIRED FOR SERVICE, USE EXTREMECARE.

Refer to Problems and Solutions for troubleshootinginformation on the baths. This guide provides thebasic information required to repair the bath.

MAINTENANCE

Cleaning: Stainless steel resists corrosion;however, it is not impervious to it. Propermaintenance of the stainless steel bath chamberhelps assure many years of service.

CAUTIONAVOID SPILLING HARSH CHEMICALS ONTOTHE BATH, AS CORROSION OF THE STAINLESSSTEEL MAY RESULT.

IMPORTANTTHE USER HAS THE RESPONSIBILITYFOR CARRYING OUT APPROPRIATEDECONTAMINATION IF HAZARDOUSMATERIAL IS SPILT ON OR INSIDE THE BATH.

The bathmshould be cleaned regularly with mildsoapy water and rinsed with distilled water. Shouldalgae or other undesirable microorganisms formon the top of the bath media, add a littleformaldehyde or quaternary ammonium germicide,available from Thermo (P/N 3166250).

IMPORTANTIF IT IS NECESSARY TO USE THE FOLLOWINGCHEMICALS, LIMIT THE TIME TO A MAXIMUMOF FOUR HOURS. CLEAN SURFACESIMMEDIATELY AFTER USE.

-Aluminum Chloride -Barium Chloride-Bichloride of Mercury -Calcium Chloride-Carbolic Acid -Chlorinated Lime-Citric Acid (boiling) -Dakin's Solution-Ferrous Chloride -Mercury Salts-Lysol Mercuric Chloride -Phenol-Potassium Permanganate -Stannous Chloride-Potassium Thiocyanate -Tartaric Acid-Sodium Hypochlorite

CAUTIONNEVER USE THE FOLLOWING CHEMICALS:

-Aqua Regia -Ferric Chloride-Iodine -Sodium Azide-Sulfuric Acid

CAUTIONDO NOT USE OTHER CLEANING ORDECONTAMINATION METHODS WITHOUTFIRST CONTACTING TECHNICAL SERVICES.

P/N: 3177876 11

The following is a list of the tools and instrumentsrequired to perform the procedures outlined in theTroubleshooting 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 useCAUTION when re-installing the flat cableconnectors that come from the display board. Makesure the pins are NOT bent or broken. Boards thatare fine otherwise, will not operate correctly if thesepins have been abused, because they will notreceive the necessary signals from other boards.

Before attempting any troubleshooting for aparticular problem, it is good practice to verifypower supply voltages of the POWER SUPPLYboard #3176677. Read these steps beforeperforming them to get acquainted with theprocedure.

1. Be sure that the main power source is OFF ordisconnected.

2. Connect J101 and J105 to the POWERSUPPLY BOARD. DO NOT connect J102 thatcomes from the CPU and the DISPLAY at thistime.

3. Connect the negative lead of the voltmeter toTP2 - COM. Select a VDC of 20. Connect thepositive lead to TP1 - UNREG.

4. Turn ON the main power.

5. The voltmeter should be reading approximately14 volts DC ±2.

6. Connect the positive lead to TP3 ±5V. Thevoltmeter should be reading +5 volts DC ±0.5.

7. Turn OFF main power.

8. Connect the display board ribbon connector tothe power supply board at J102 and thenrepeat steps 3 thru 6. Do not connect theconnector to the CPU board at this time . If theabove voltages are not measured again, thedisplay board has a bad component which isloading down the voltages. If the voltages arestill present, continue on to step 9.

9. Connect the display board ribbon connector tothe CPU board J310 and repeat steps 3 thru 6.If the above voltages are not measured again,the CPU board has a bad component which isloading down the voltages. This board willhave to be replaced.

GENERAL INFORMATION: The POWERSUPPLY PCB ASSEMBLY #3176677 has the triac(solid state AC voltage switch) on it which suppliesthe power to the heater. This triac is "told" tooperate, when need be, by the microprocessor.There is another device known as an opto-couplerwhich serves as the high/low voltage isolatorbetween the triac and the microprocessor.

When the bath starts experiencing temperatureproblem and/or variations, due to known controllermalfunctioning, these two components becomeprime suspects. The reason being, they are underhigher operating stress than other components.

If the bath starts experiencing temperatureproblems such as no heat, or "creeping" upwardheat, then follow the troubleshooting instructionsbelow. These instructions require the use of avoltmeter being able to measure DC and ACvoltages (preferably a digital voltmeter).

WARNINGTHE FOLLOWING TROUBLESHOOTINGINSTRUCTIONS REQUIRE THAT POWER BEON. ONLY QUALIFIED SERVICE PERSONNELSHOULD PERFORM THESE PROCEDURES.

Open the control cover and familiarize yourselfwith the POWER SUPPLY assembly #3176677.Locate the triac (Q2), the opto-isolater (U1), resistor(R4), test point #2 (TP2-COM). The firstmeasurements will be DC voltage measurements,a DC scale of at least 10 volts should be selected.

P/N: 3177876 12

5. The bath is not heating when it should berequesting heat. Voltage measurements aremade on the POWER SUPPLY BOARD#3176677.

a. Select a setpoint temperature at least 10°above what the actual temperature is.The bath should be requesting heat asindicated by the heater "ON" indicatorlamp on the front panel. It should be oncontinuously, not flashing.

b. Measure the voltage at U1-PIN 2 withrespect to TP2-COM. It should be nogreater than 4 VDC.

c. Measure the DC voltage across R4. Sincethe bath is requesting heat, there shouldbe current flowing through this resistormaking the voltage drop equal to 3 VDC±0.5.

d. If the last two steps are not as stated, thenmost likely the CPU board is bad and it willhave to be replaced. Otherwise continueto step "e".

e. Switch the voltmeter to an AC volts scalecapable of reading 120 volts.

f. Measure the voltage between U1-PIN 4and U1-PIN 6. It should be less than 1VAC.

g. If it is not, then most likely the opto-couplerU1 is bad and the POWER SUPPLYboard will have to be replaced. If it is,continue to step "h".

h. Measure the voltage directly across theheater. It should be line voltage 110VACto 120 VAC.

i. If it is not, then most likely the triac Q2 isbad, and the POWER SUPPLY board willhave to be replaced.

PROBLEMS & SOLUTIONS

*********** Problem A : No Heat *************

1. Verify that the setpoint temperature is greaterthan the actual water temperature.

2. Verify that the HIGH TEMP light is "OFF". Ifthe light is "ON", turn the HIGH LIMITCONTROL fully clockwise.

3. Check temperature probe voltage reference.These measurements are on the CPU board#3176678.

a. Place the negative lead of a DC voltmeteron TP1-COM test point. Measure thevoltage at U7-pin 2. It should beapproximately 14 volts DC. Then measurethe voltage at U7-Pin 6. It should beapproximately 5 volts DC. If the 14 volts ispresent but not the 5 volts, the CPU boardmust be replaced.

4. Check temperature probe.a. Measure the bath water temperature and

make note of it. Make sure it will notchange drastically during this check.

b. With a DC voltmeter, measure the supplyof the temperature sensor at J302 pins 1& 3. It should be approximately 5 volts. Ifit is, then continue on to step "c". If not, seeStep 3a.

c. Measure the output of the temperaturesensor at J302 pins 2 & 3. Pin 3 being thereference or ground. The outputrelationship of voltage to degreescentigrade is listed in the table below.Compare the measured voltage to thetemperatures listed to determine if theprobe is working.

TempDegrees C Volt

TempDegrees C Volt

10 0.500V 60 1.400V

20 0.680V 70 1.580V

30 0.860V 80 1.760V

40 1.040V 90 1.940V

50 1.220V 99 2.218V

P/N: 3177876 13

g. If it is not, most likely the opto-coupler U1is bad and the POWER SUPPLY boardwill have to be replaced. If it is, continue tostep "h".

h. Measure the voltage directly across theheater. It should be approximately 0 VAC.

i. If it is not, them most likely the triac Q2 isbad, and the POWER SUPPLY board willhave to be replaced.

2. Check Temperature Probe. Problem A, Step 4.

6. Check heater.

a. Disconnect the bath from its electricalsupply.

b. Isolate the heater from any circuitry bydisconnecting one of the heater leads.

c. Using an ohmmeter, check the heaterresistance. Appropriate heater resistancevalues are listed below:

If the resistance reads 0 or infinity, thenreplace the heater.

d. Check the resistance between the heaterleads and ground (green wire). If theresistance reads 0 ohms, replace theheater.

********* Problem B: Constant Heat *********

1. Bath is heating when it is not requesting heat.

a. Select a setpoint temperature at least 10°below the actual temperature. The bathshould not be requesting heat as indicatedby the HEATER ON indicator lamp on thefront panel. It should NOT be oncontinuously or even flashing.

b. Measure the voltage at U1-PIN 2 withrespect to TP2-COM. It should be no lessthan 4 VDC.

c. Measure the DC voltage across R4. Thevoltage should be approximately zero volts.

d. If the last two steps are NOT as stated,then most likely the CPU board is bad andit will have to be replaced, otherwisecontinue to step "e".

e. Switch the voltmeter to an AC volts scalecapable of reading 120 volts.

f. Measure the voltage between U1-PIN 4and U1-PIN 6. It should be line voltage 110VAC to 120 VAC.

*** Problem C: Unstable Temperature *** Control or Display

1. Use gable cover provided to improvetemperature control.

2. If control is stable but not at desiredtemperature, then check temperaturecalibration. Re-adjust if necessary.

3. Check Temperature Probe, Problem A, Step 4.

** Problem D: Display Reads NNNN or UUUU **

The control boards have the ability to detect anOPEN or SHORTED temperature sensor. Thesetwo conditions are shown on the display as follows:

DISPLAY CONDITIONUUUU SHORT CIRCUIT

OPEN CIRCUIT

Before coming to the conclusion that the probe isbad when one of these displays appear, check theconnection of the probe to the circuit board forpolarity and alignment.

**Problem E: Display Reads all Eights (8888) **

1. The most common cause of this problem isthe failure of the driver integrated circuit on theDISPLAY/KEYBOARD board (#3176679).Replace it.

UUUU

120 Volt 240 Volt

MODEL2862/2863 10 OHMS 40 OHMS

P/N: 3177876 14

*** Problem F: Pump Does Not Circulate *** Water

1. Verify that the water level is above both thepump inlet and outlet.

2. If pump is not running, verify that power isapplied to the bath. If power is present, checkwiring of pump to power switch. If wiring iscorrect, replace the pump.

3. If pump is running but water is not circulating,open the control panel and gently squeeze thelong piece of rubber tubing a few times to helpremove any air trapped within the pumpingsystem.

4. If water is still not circulating, check for foreignmatter in the pump inlet fitting.

PARTS REPLACEMENT

Before removing any parts for replacement, verifypart in question by following the instructions listedin the troubleshooting guide.

Refer to Parts Replacement Table below forappropriate replacement procedures. Failure tofollow parts replacement procedures may causedamage to the bath.

WARNINGBEFORE REPLACING ANY PART, TURNPOWER SWITCH TO OFF, THEN UNPLUGTHE UNIT FROM ITS POWER SOURCE.SERVICE SHOULD BE PERFORMED BY AQUALIFIED TECHNICIAN.

CAUTIONWHEN REPLACING TEMPERATURE SENSOR,HEATER OR CIRCULATING PUMP, MAKE SUREALL SEALS ARE WATERTIGHT BEFOREAPPLYING 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 tothe vertical position.

Circulating PumpReplacement

1. Drain water from bath.2. Remove the two pump leads attached to power switch and green wire from pump to ground lug.3. Loosen the two visible hose clamps with a screwdriver and remove tubing from pump.4. Disconnect pump from pump bracket by removing two screws and remove pump from bath.5. Reverse above procedure to install new circulating pump.

1. Drain water from bath.2. Remove diffuser pan from bath.3. Remove connector J302 from CPU board.4. Remove temperature sensor fitting from inside bath pan. - Hold small nut on fitting firmly with a wrench. - Remove large fitting piece with another wrench.5. Remove rubber grommet from temperature sensor.6. Carefully slide sensor through the control housing and remove.7. Reverse above procedure to install new temperature sensor.8. Recalibrate new temperature sensor. See Temperature

Calibration on page 15.

Replace Temperature Sensor

P/N: 3177876 15

Replace Heater 1. From inside control housing, remove 2 nuts and disconnectwires from heater leads.

2. Remove two hex nuts from heater ends using a 13/16"socket and remove heater.

3. Reverse above procedure to install new heater.

Replace "HI LIMIT" 1. Remove four leads from thermostat terminals. Thermostat

2. Remove two screws from thermostat bracket and removebracket.

3. Carefully tilt bath on its side.

4. Remove eight screws from bottom plate and remove plate.

5. Remove insulation from bottom of pan and between panand control panel wall.

6. Loosen two nuts from thermostat bulb bracket.

7. Carefully remove thermostat from control housing by slidingbulb through hole in control panel wall.

8. Reverse above procedure to install new Hi Limit thermostat.Use extreme care when installing new thermostat. A sharpbend in the thermostat capillary will crimp off flow ofhydraulic fluid.

Replace Power Supply 1. Remove connectors J101, J102, J103, and J105 from board. Board Use extra care when removing J102 so as not to bend

connector pins.

2. Remove five nuts from board and then remove it.

3. Reverse above procedure to install new power supply board.

Replace CPU or 1. Remove connectors J302 and J303 from CPU board. Display/Keyboard Board 2. Remove connector J102 from power supply board. Use

extreme care when removing J102 so as not to bendconnector pins.

3. Remove four nuts from CPU board and remove CPU boardand Keyboard/Display board.

4. Remove J201 from CPU board. Use extreme care whenremoving J301 so as not to bend connector pins. Removeboard.

5. Reverse above procedure to install new board.

PARTS REPLACEMENT (CONT'D)

See note on thefollowing page **

P/N: 3177876 16

PARTS REPLACEMENT (CONT'D)

6. The software must be configured to match the Bath model. To enter configuration mode, press the upper left push-button

switch while applying power. The upper left switch is labeled"Calibrate." This switch is used to enter configurationcodes and steps through the different levels of

configurations. When a triangle is shown in the chart, thepush-button 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 softwarerevision. The readout will then begin to do a self-test ofdigits. Press the "Calibrate" switch once. The readout willdisplay 0000. Follow the listing below to complete theconfiguration.

A. Enter 37 using up/down arrows. Press "Calibrate"

B. Enter 51 using up/down arrows. Press "Calibrate"

C. Enter 2.0 using up/down arrows. Press "Calibrate"

D. Enter 500 using up/down arrows. Press "Calibrate"

E. Enter 1 using up/down arrows. Press "Calibrate"

F. Display Not Used. Press "Calibrate"

G. Display Not Used. Press "Calibrate"

H. LOW TEMP CALIBRATION*LITTLE c. Factory Setting. Press "Calibrate"

I. HI TEMP CALIBRATIONBIG C. Factory Setting. Press "Calibrate"

Configuration is now complete

Replace CPU or Display/Keyboard Board See note below **

* Calibration of the low and high end of the sensor input is done at the factory. Field calibration ofthe sensor may be performed using the following technique: Enter the configuration routine andpress the top left switch until a little "c" (Item H) is displayed. Add water that is around 10°C to thebath completely covering the sensor. Insert a calibrated thermometer. After the thermometerstabilizes, 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 I).Remove water from the bath and add hot water of about 70 - 80°C. After the unit stabilizes, matchreadout display to temperature on thermometer and press the top left switch. Calibration is nowcomplete.

**Note: When replacing CPU printed circuit board reprogramming may be necessary. Follow thoroughly instructions provided with the replacement circuit board.

P/N: 3177876 17

8. Place the temperature probe and a calibratedreference thermometer into an ice bath. PressUP or DOWN until the display value matchesthe reference thermometer. Press ENTER tostore the new low temperature calibrationvalue.

9. The display will now show CXX.X - this is HighTemperature Calibration. (XX.X is the actualbath temperature).

10. Place the temperature probe and a calibratedreference thermometer into a steaming waterbath. Press UP or DOWN until the displayvalue matches the reference thermometer.Press ENTER to store the new hightemperature calibration value.

NOTEPRESSING OFFSET AT ANY TIME DURINGTHE CALIBRATION PROCESS WILL RETURNUNIT TO NORMAL OPERATION MODE ANDDISPLAY WILL SHOW ACTUAL BATHTEMPERATURE.

TEMPERATURE CALIBRATION

The following provides a step-by-step procedurefor temperature calibration. Do not deviate fromthe procedure or the calibration of your bathmay be inaccurate.

CAUTIONTHIS PROCEDURE SHOULD ONLY BEPERFORMED AFTER INSTALLING A NEWTEMPERATURE PROBE INTO THE BATH.

1. Connect the temperature probe connector toJ302 on CPU board.

2. Turn Power switch to the OFF position.

3. Press and hold UP, DOWN, and ENTER keyswhile turning Power ON.

4. The unit will now cycle through an LED displaytest. Press ENTER to end test.

5. The display will now read 0000. Press UP untildisplay reads 0012.

6. Press ENTER - The unit is now in calibrationmode. If some other value than 0012 isdisplayed and ENTER is pressed, the unit willreturn to normal operating mode and displaywill show actual bath temperature.

7. The display will now show CXX.X (XX.X is theactual bath temperature) - this is LowTemperature Calibration.

P/N: 3177876 18

REPLACEMENT PARTS LIST

Model #2862/2863

120V 240V

Bath Pan Kit 3167141

Diffuser Pan Assy 3164479

PCB Kit, PowerSupply 3166924

PCB Assembly, CPU 3167119

PCB Assembly, Display 3166679

Heater Kit 3167136 3167137

Voltage Connector 3176698 3176699

Wire Harness 3176700

Temperature Probe Kit 3167144

O-Ring Kit, Water Bath 3167129

Tubing Kit 3167145

"Hi- Limit" Thermostat Kit 3167143

ON/OFF Switch 3175318

Hi Limit Light, Amber 3177575 3173907

Line Cord 3178034 3179481

Pump Assembly Kit 3167333 3167342

Drain Kit (includes Nut & O-Ring)

3166191

P/N: 3177876 19

ACCESSORY PARTS LIST

Model#2862/2863

120V 240V

Cover, Gable 3166208

Kit, Water Level Regulator 3166223

Sanitizer, Oakite 3166250

Test Tube Rack (Capacity 50 tubes) 3161601

Petri Dish Rack (Capacity 96 dishes) 3166183

P/N: 3177876 20

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P/N: 3177876 23

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P/N: 3177876 24

O-RING SUPPLIEDWITH FITTING

NUT

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TEMPPROBE

ASSEMBLY

NUT

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THERMOSTAT BULB(PART OF THERMOSTAT)

1/8” HALF COUPLING

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FRONT VIEW(CUTAWAY DETAIL OF TEMP PROBE & PUMP OUTLET)

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

P/N: 3177876 25

FRONT VIEW(CUTAWAY DETAIL OF PUMP INLET & HEATER)

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HEATER LEAD(PART OF WIREHARNESS)

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P/N: 3177876 26

INSULATION

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TO REMOVE HEATER:-REMOVE HEATER BRACKET(S)FROM INSIDE OF PAN-REMOVE HEATER LEADS FROM ENDOF HEATER-REMOVE LARGE NUT LOCATED INAREA BETWEEN PAN AND BODYWALL-LIFT HEATER OUT OF PAN

HEATER REMOVAL DETAIL

CUTAWAY VIEW OF DRAIN

DRAIN PLUG

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NUT(PROVIDEDWITH HEATER)

NUT(PROVIDEDWITH HEATER)

HEATER LEAD(PART OF WIREHARNESS)

P/N: 3177876 27

CPU/PCB ASSEMBLY CONFIGURATION

J303

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P/N: 3177876 28

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an

d C

an

ad

a)

or

1-7

40

-37

3-4

76

3. W

e're

re

ad

y to

an

sw

er

yo

ur

qu

estio

ns o

n e

qu

ipm

en

t w

arr

an

ty, o

pe

ratio

n, m

ain

ten

an

ce

, se

rvic

e a

nd

sp

ecia

l

ap

plic

atio

n.

Ou

tsid

e t

he

US

A,

co

nta

ct

yo

ur

loca

l d

istr

ibu

tor

for

wa

rra

nty

in

form

atio

n.

Re

v. 4

4

/09

ISO

9001

REGI

STER

ED

P/N: 3177876 33

TH

ER

MO

FIS

HE

R S

CIE

NT

IFIC

IN

TE

RN

AT

ION

AL

DE

AL

ER

WA

RR

AN

TY

The W

arr

anty

Period s

tart

s t

wo m

onth

s f

rom

the d

ate

your

equip

ment

is s

hip

ped f

rom

our

facili

ty.

This

allo

ws f

or

ship

pin

g

tim

e s

o t

he w

arr

anty

will

go into

effect

at

appro

xim

ate

ly t

he s

am

e t

ime y

our

equip

ment

is d

eliv

ere

d.

The w

arr

anty

pro

tec-

tion e

xte

nds t

o a

ny s

ubsequent

ow

ner

during t

he f

irst

year

warr

anty

period.

Deale

rs w

ho s

tock o

ur

equip

ment

are

allo

wed

an a

dditio

nal six

month

s for

deliv

ery

and insta

llation, pro

vid

ed the w

arr

anty

card

is c

om

ple

ted a

nd r

etu

rned to the T

echnic

al

Serv

ices D

epart

ment.

During the first year, c

om

ponent part

s p

roven to b

e n

on-c

onfo

rmin

g in

mate

rials

or

work

manship

will

be r

epaired o

r re

pla

ced

at T

herm

o's

expense, la

bor

exclu

ded. In

sta

llation a

nd c

alib

ration a

re n

ot covere

d b

y this

warr

anty

agre

em

ent. T

he T

echnic

al

Serv

ices D

epart

ment

must

be c

onta

cte

d f

or

warr

anty

dete

rmin

ation a

nd d

irection p

rior

to p

erf

orm

ance o

f any r

epairs.

Expendable

ite

ms,

gla

ss,

filters

, re

agents

, tu

bin

g,

and g

askets

are

exclu

ded f

rom

this

warr

anty

.

Repla

cem

ent

or

repair o

f com

ponents

part

s o

r equip

ment

under

this

warr

anty

shall

not

exte

nd t

he w

arr

anty

to e

ither

the

equip

ment or

to the c

om

ponent part

beyond the o

rigin

al w

arr

anty

period. T

he T

echnic

al S

erv

ices D

epart

ment m

ust giv

e p

rior

appro

val

for

retu

rn o

f any c

om

ponents

or

equip

ment. A

t T

herm

o's

option,

all

non-c

onfo

rmin

g p

art

s m

ust

be r

etu

rned t

o

Therm

o p

osta

ge p

aid

and r

epla

cem

ent

part

s a

re s

hip

ped F

OB

destination.

TH

IS W

AR

RA

NT

Y I

S E

XC

LU

SIV

E A

ND

IN

LIE

U O

F A

LL

OT

HE

R W

AR

RA

NT

IES

, W

HE

TH

ER

WR

ITT

EN

, O

RA

L O

R

IMP

LIE

D.

NO

WA

RR

AN

TIE

S O

F M

ER

CH

AN

TA

BIL

ITY

OR

FIT

NE

SS

FO

R A

PA

RT

ICU

LA

R P

UR

PO

SE

SH

AL

L A

PP

LY.

Therm

o s

hall

not

be lia

ble

for

any indirect

or

consequential dam

ages inclu

din

g,

without

limitation,

dam

ages r

ela

ting t

o lost

pro

fits

or

loss o

f p

rod

ucts

.

Your

local

Therm

o S

ale

s O

ffic

e i

s r

eady t

o h

elp

with c

om

pre

hensiv

e s

ite p

repara

tion i

nfo

rmation b

efo

re y

our

equip

ment

arr

ives.

Printe

d instr

uction m

anuals

care

fully

deta

il equip

ment

insta

llation,

opera

tion a

nd p

reventive m

ain

tenance.

Conta

ct

your

local dis

trib

uto

r fo

r w

arr

anty

info

rmation.

We’re r

eady t

o a

nsw

er

your

questions o

n e

quip

ment

warr

anty

, oper-

ation,

main

tenance,

serv

ice a

nd s

pecia

l applic

ation.

Re

v. 4

2

/09

ISO

9001

REGI

STER

ED