7000665r2-LTM1881X1_Oven_Layout 1
Contents
1. Compact Mechanical Convection Ovens Refer to the Specification Plate for the complete model number serial number and series number when requesting service replacement parts or in any correspondence concerning this unit All parts listed herein may be ordered from the Thermo Scientific dealer from whom you purchased this unit or can be obtained promptly from the factory When service or replacement parts are needed check first with your dealer Ifthe dealer cannot process your request then contact our Technical Services Department Prior to returning any materials contact our Technical Services Department for a Return Materials Authorization number RMA Material returned without an RMA number will be refused Thermo Scientific thermoscientific com 2014 Thermo Fisher Scientific Inc All rights reserved All trademarks are the property of Thermo Fisher Scientific and its subsidiaries Specifications terms and pricing are subject to change Not all products are available in all countries Please consult your local sales representative for details Thermo Fisher Scientific 401 Millcreek Road Marietta Ohio 45750 United States Thermo SCIENTIFIC A Thermo Fisher Scientific Brand2. Precision Compact Ovens with Mechanical Convection Operating and Parts Llst LTM1881X1 Rev 2 Visit us online to register your warranty Thermo www thermoscientific com labwarranty SCIENTIFIC 2 a Preface Models covered in this manual M Te Ten PR305220M 665 240V PR305225M 666 120V PR305220MCN 670 240V MANUAL NUMBER LTM1881X1 7000665 2 40434 8 10 15 Added installation ventilation distances needed pg 3 2 CCS 1 31325 2 16 15 Added explosion and fire warning CCS 0 4 30 10 Transfer to Marietta was LTM1881X1 8 4 09 CCS REV ECR ECN DATE DESCRIPTION By Thermo Scientific Compact Mechanical Convection Ovens i Preface CAUTION Contains Parts and Assemblies r N Susceptible to Damage by Electrostatic Discharge ESD Important Read this instruction manual Failure to read understand and follow the instructions in this manual may result in damage to the unit injury to operating personnel and poor equipment performance A Caution All internal adjustments and maintenance must be performed by qualified service personnel A Material in this manual is for information purposes only The contents and the product it describes are subject to change without notice Thermo Fisher Scientific makes no representations or warranties with respect to this manual In no event shall Thermo be held liable for any damages direct or incidental arising out of or related to the use of this
3. 1 Some Stainless Guidelines to Consider o oooooooooooo 5 2 Special Considerations s Lose pau e TEN OS e 5 2 Tie DEL Factor ce Rra a Mite qa D Dos a eg 5 2 Cleaning Methods on Caso E pda oti t xem TOS VPE Rd 5 3 leasing ALENS et ucc elt n Rr et ELA a M dod 5 3 Fail re to Heat uy es o EH a eO ege Va debi aues 5 4 Part Replacement Procedures 0x a ured oe ED C ts 5 4 Replacing Thermostat qos tie Seu ets T ake wit I VEDI Tad 5 4 Replacing Power Switch ido coa A rud 5 5 Replacing Heater iyn raaraa as ae 5 6 Replacing Hi Limit Thermostat 43 sts eae ee 5 6 Replacing Status Lamp Bulb Assembly 0ooo ooooo ooo 5 6 Replacing the Blower Motor pio EQ Ead 5 7 Replacing Blower Wheel Servicing o oooooooooooo 5 7 Temperature Readout Calbiaton s 2065 re ae s 5 8 Replacement Parts 21 ooo rr ERR RS 6 1 Ordering Procedures cia ss as una Tea OUR ed 6 2 Compact Mechanical Convection Ovens V Section 1 Introduction Thank you for selecting Thermo Scientific products for your equipment needs Thermo Scientific Precision Compact Ovens with mechanical convection are designed for use in industry hospitals school laboratories wherever there is a need for economical and reliable ovens for drying sterilizing baking evaporating and similar type work A hydraulic thermostat provides reliable temperature control with a range from 56C above ambient to 210 C A sheathed heater is positioned in the bottom of the chamber along w
4. Phillips screws Save 3 Carefully remove insulation Note how it is positioned so that it can be easily reinstalled 4 Remove bottom panel by unscrewing Phillips screws Save 5 Remove control knob by unscrewing 2 Allen screws Save 6 Disconnect wires from thermostat Note position of wires for subsequent reattachment in same sequence Thermo Scientific Section 5 Maintenance Replacing Thermostat 7 Knob removal allows access to 2 screws that mount thermostat to continued panel Remove the screws and save 8 Remove bottom shelf inside chamber Loosen screw on clamp that holds thermostat sensing bulb to heater Note position of temperature sensing bulb so that new one can be clamped in same location 9 Slide bulb toward exit hole at the back of unit 10 Move to back of unit and pull temperature sensing bulb and tube through hole 11 Next pull bulb and tube through bottom hole 12 Thermostat sensing bulb and tube assembly can now be removed 13 Reverse above procedure to install new thermostat 14 Avoid making sharp bends in temperature sensing tube otherwise flow of temperature sensing fluid will be impeded Replacing Power Switch 1 With unit on its side as in the preceding remove bottom plate and save screws 2 Disconnect wires from switch Note sequence of pin numbers on the side of the switch and attachment of wires The replacement switch must be oriented in the same manner and wires attached in
5. injury to personnel A Compact Mechanical Convection Ovens 4 1 Section 4 Operation Temp Control Thermostat 4 2 Compact Mechanical Convection Ovens Refer to Figure 4 1 for the procedure below With the temperature control thermostat 5 in the extreme counterclockwise position turn the power rocker 1 to its On position Switch s green status lamp will light 2 Turn the temperature control thermostat 5 in clockwise direction to increase the temperature and counterclockwise to lower it The amber status lamp 6 above the thermostat goes on when the heaters are energized Wait for the chamber temperature to stabilize before advancing thermostat too rapidly to reach target temperature Note that dial setting to obtain a specific temperature will need to be approximated and can be affected by such factors as changes in line voltage ambient conditions and types of materials being heated 3 Read the LED display 4 for the chamber temperature produced by each setting of the temperature control thermostat 5 As experience is gained with the temperature control thermostat improved results will be obtained in setting it to achieve specific target temperatures 4 Always allow time for the oven to reach target temperature and to stabilize before making further adjustments of the temperature control thermostat Caution At the higher temperatures the exterior of the oven and particularly the vent ring on the top of the oven b
6. manual 2010 Thermo Scientific All rights reserved Compact Mechanical Convection Ovens Thermo Scientific Preface Important operating and or maintenance instructions Read the accompanying text carefully Potential electrical hazards Only qualified persons should perform procedures associated with this symbol Equipment being maintained or serviced must be turned off and locked off to prevent possible injury Hot surface s present which may cause burns to unprotected skin or to materials which may be damaged by elevated temperatures Marking of electrical and electronic equipment which applies to electrical and electronic equipment falling under the Directive 2002 96 EC WEEE and the equipment that has been put on the market after 13 August 2005 Its gt This product is required to comply with the European Union s Waste Electrical amp Electronic Equipment WEEE Directive 2002 96 EC It is marked with the WEEE symbol Thermo Fisher Scientific has contracted with one or more recycling disposal companies in each EU Member State European Country and this product should be disposed of or recycled through them Further information on Thermo s compliance with this directive the recyclers in your country and information on Thermo Scientific products will be available at www thermoscientific com Y Always use the proper protective equipment clothing gloves goggles etc Y Always dissipate extreme cold or heat and we
7. product being utilized Also follow the personal protection index found in the Hazardous Materials Information System HMIS section of the MSDS A Note The use and disposal of these chemicals may be regulated by your local city codes consult those regulations before of disposing of those materials A Compact Mechanical Convection Ovens 5 3 Section 5 Maintenance 5 4 Materials Effective in Disinfecting Failure to Heat Part Replacement Procedures Replacing Thermostat Compact Mechanical Convection Ovens e Glutaraldehyde e Alcohol Be Advised This information is intended as guidelines only and we make no claim as to the suitability to any particular situation Consult your staff chemist to determine what would be best for your stainless steel product and laboratory A If the oven fails to heat there are several possible causes e The oven is not receiving electrical power The heater is burned out e The thermostat is malfunctioning Have a qualified electrical technician determine the cause of the problem and make the necessary repairs The following should be performed only by authorized personnel Unplug unit from power source If oven has been used recently be certain that surfaces are safe to touch before attempting to carry out any of the following procedures Remove contents of oven and thermometer from top of unit 1 Place unit on its side with door latch facing down 2 Remove back by unscrewing
8. sure that unit has been turned off for a period of time so that there is no residual heat on any of the surfaces Remove back panel by unscrewing Phillips screws and save Carefully remove insulation and save Note how it is positioned so that it can be easily reinstalled Remove two retaining clips that mount heater to back of inside wall Save Remove wires to heater by uncoupling the quick disconnects Remove bottom shelf inside chamber Loosen screw on clamp which holds thermostat sensing bulb to heater Note position of temperature sensing bulb so that new one can be clamped in same location Install new heater and reverse the preceding steps Thermo Scientific Section 5 Maintenance Replacing Blower Wheel 1 Disconnect power cord Servicing Remove shelves Note that bottom shelf is retained by a clip at the back of the oven Lift shelf at the front edge until the back edge can be withdrawn from the clip 3 Remove Phillips screws holding shield that covers blower wheel 4 Inspect blower wheel assembly for tightness and any off center operation Inspect blower wheel itself for damage to vanes or other deterioration If assembly is loose tighten setscrew holding wheel to motor shaft until wheel turns true If wheel is damaged replace 5 Replace the shield and shelves Replacing the Blower 1 Disconnect unit from power source If previously in use let unit cool Motor down 2 Lay unit on side Remove she
9. H 47 x 40 x 64 cm Chamber Dimensions 16 W x 11 D x 16 1 8 H 41 x 29 x 41 cm Volume 1 7 cu ft 48 1 liters Shipping Weight 65 lbs 30 kg Performance Characteristics Temperature Range All models ambient 5 C to 210 C Thermostat Control 5 over entire range Thermometer Digital 2 C over entire range Environmental Operating Conditions Pollution Degree recipi Rb ERES sees 2 Installation Category 4e o ot pi bees I Altitude 2000 Meters MSL Mean Sea Level Humidity 80 maximum non condensing Electrical Supply s 120VAC or 240VAC Voltage Tolerance 10 of normal rated line Temperature 44 52 002 15 C to 40 C Product Usage This product is intended for use indoors only Refer to IEC 664 1 Compact Mechanical Convection Ovens 2 1 Section3 Unpacking and Installation The shipping carton should be inspected upon delivery When received carefully examine for any shipping damage before unpacking If damage is discovered the delivering carrier should both specify and sign for the damage on your copy of the delivery receipt Open the carton carefully making certain that all parts are accounted for before packaging materials are discarded After unpacking if damage is found promptly report it to the carrier and request a damage inspection promptly Important Failure to request an inspection of damage within a few days after receipt of shipment absolves the
10. ances are correct it yourself over the telephone without a service call When more extensive service is necessary we will assist you with direct factory trained technicians or a qualified service organization for on the spot repair If your service need is covered by the warranty we will arrange for the unit to be repaired at our expense and to your satisfaction Regardless of your needs our professional telephone technicians are available to assist you Monday through Friday from 8 00 a m to 6 00 p m Eastern Time Please contact us by telephone or fax If you wish to write our mailing address is Thermo Fisher Scientific 401 Millcreek Road Box 649 Marietta OH 45750 International customers please contact your local Thermo Scientific distributor iv Compact Mechanical Convection Ovens Thermo Scientific Thermo Scientific Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Table of Contents INTOJUCUON ee ea 1 1 Specifications ee rer 2 1 Unpacking and Installation 0c cece eee e eee ee eee 3 1 Locations M A ah A Neo Rah NG a 3 2 Levelt AS ansteigen 3 2 Shelving To dota oe lan ele a Pa ey a as ae u a es 3 3 2 Electrical Connection pior ieee PONO duum euis 3 2 Besdyisedao s 22V e ee 3 2 Operation PE 4 1 Temp Control Thermostat 20275 Seren 2x eee REERROAS EEG 4 2 MAaINlenance ioa id ah etaed on a nereden dao ACC eH ara 5 1 Care and Cleaning of Stainless Steel ana sr aan TAA 5
11. ar protective clothing Y Always follow good hygiene practices Y Each individual is responsible for his or her own safety Thermo Scientific Compact Mechanical Convection Ovens iii Preface Do You Need Information or Assistance on Thermo Scientific Products If you do please contact us 8 00 a m to 6 00 p m Eastern Time at 1 740 373 4763 Direct 1 800 438 4851 Toll Free U S and Canada 1 877 213 8051 FAX http www thermoscientific com Internet Worldwide Web Home Page service led marietta thermofisher com Tech Support Email Address www unitylabservices com Certified Service Web Page Our Sales Support staff can provide information on pricing and give you quotations We can take your order and provide delivery information on major equipment items or make arrangements to have your local sales representative contact you Our products are listed on the Internet and we can be contacted through our Internet home page Our Service Support staff can supply technical information about proper setup operation or troubleshooting of your equipment We can fill your needs for spare or replacement parts or provide you with on site service We can also provide you with a quotation on our Extended Warranty for your Thermo Scientific products Whatever Thermo Scientific products you need or use we will be happy to discuss your applications If you are experiencing technical problems working together we will help you locate the problem and ch
12. carrier from any liability for damage Call for a damage inspection promptly Warning Do not place oven on or near any combustible surface to avoid the possibility of fire and resulting property loss and injury or death to personnel A Caution Do not remove the rubber space feet Removal of the feet will prevent proper air venting air used to cool the electronics is discharged out the bottom of oven chamber that may cause excessive heat buildup on electrical components and erratic control of temperature A Caution Bottom shelf is fixed in place to guard against access to heater area and possibility of injury Do not remove bottom shelf unless performing maintenance or repair A Note Disconnect unit from the power source when not in use Thermo Scientific Compact Mechanical Convection Ovens 3 1 Section 3 Unapcking and Installation Location Leveling Shelving Electrical Connection 3 2 Be Advised Compact Mechanical Convection Ovens The oven should be located in an area free from drafts and sources of heat as well as allowing for natural air movement to dissipate heat from the oven To ensure needed ventilation around the oven allow 1 5 inches on each side and 3 inches at the back Allow enough distance above the unit to be able to install and retrieve the thermometer The oven should be on a level surface in order to facilitate movement of materials into and out from the chamber Slide shelves into place inside th
13. dd 2 to 40 PPM 20 to 40 mg liter diodium phosphate or sodium bicarbonate adjusting dosage to provide a pH value of 7 to 9 If not available use clean aerated soft tap water provided the total solids concentration is lt 500 PPM We do not recommend using 18M Ohm deionized water If this is the only source of treated water available mix with regular tap water at a 50 50 ratio Check pH regularly If pH is lt 6 0 add disodium phosphate to increase pH to a 7 to 9 value Sodium carbonate or sodium bicarbonate may be used but they tend to form scale that must be rinsed out regularly If pH is 10 0 add sodium bisulfate to decrease pH to a 7 to 9 value Avoid adding harsh alkalines or acids since these may cause localized corrosion and result in unstable pH Chemicals which should be limited to a 3 hour maximum exposure time to stainless steel are Aluminum chloride E D T A Barium chloride Ferrous chloride Calcium chloride Sodium hypochlorite Chlorinated Lime Stannous chloride Warning If it is necessary to use these chemicals limit exposure time to a maximum of 3 hours always clean surfaces immediately after use A Be advised Never use the following on stainless steel Sodium acid Sodium azide Dd Chemical spills especially those agents listed here should be removed as soon as possible and the stainless steel surface cleaned with mild soapy water followed by a clean water rinse Thermo Scientific Cleansing Agen
14. e oven and position according to the height required for the items or materials to be heated The 120V unit is supplied with a 3 wire line cord with molded plug It should be connected to a 120V outlet designed for 3 prong plugs For an outlet designed to accept 2 prong plugs ungrounded the best advice is to have a qualified electrician replace it with a new grounded outlet If a plug must be installed use only the 3 prong grounded type rated for the unit load requirements and matching the power outlet Make sure the green ground wire is secured to the plug ground terminal The unit must be connected to a power source that meets the electrical requirements as specified on the unit s nameplate Where it becomes necessary to make changes in electrical outlets wiring and other characteristics it is recommended that these be done by a qualified or journeyman electrician This includes replacing 2 prong plugs ungrounded for example with a 3 prong plug grounded All changes need to be made to match the load requirements shown on the nameplate of the unit Warning This unit is not explosion proof Do not use in the presence of flammable or combustible materials fire or explosion may result Unit contains components that may ignite such materials Before operating oven always observe the following safety precautions e Fumes and spillage from acidic solutions cause corrosion of the stainless steel chamber Maintain a neutral pH at al
15. ecome warm to the touch To avoid burns do not touch these surfaces e A factory set hi limit thermostat cuts off power to the heater in the event that the maximum operating range is exceeded The red status lamp 2 on the control panel indicates when the hi limit thermostat is controlling It goes out when oven reverts to a safe operating range Thermo Scientific Care and Cleaning of Stainless Steel Thermo Scientific Section 5 Maintenance The bottom shelf that covers the heater can be removed for easy access to the heater area Clean up any spills as soon as possible to prevent materials being baked on surfaces When the oven is cool use a mild soap and water to clean surfaces Rinse thoroughly and dry It is best to avoid highly abrasive cleaners which can damage the finish of the interior surfaces and shelves Warning Disconnect plug from electrical outlet before attempting any maintenance or repair of this unit A Note Make no attempt to service or repair a Thermo Scientific product under warranty before consulting your Thermo dealer After the warranty period such consultation is still advised especially when the repair may be technically sophisticated or difficult If assistance is needed beyond what the distributor can provide please call Technical Services No merchandise should be returned directly to the factory without obtaining a Return Materials Authorization RMA number from Technical Services A Stainless ste
16. el is an alloy of steel with chromium and nickel that increase the metal s resistance to rust and corrosion Yet if not properly cared for stainless steel can rust and corrode Exposure to air provides the passivation or oxide layer coating for clean stainless by producing a thin durable chromium oxide that forms rapidly on the alloy surface to give stainless its characteristic stainless quality Also exposure of the surface to other oxidizing environments can produce a passivating film or coating However if free oxygen is not available due to scale or contamination buildup the metal surface may become vulnerable to rusting and corrosion as well as pitting But by maintaining neutral pH and conducting frequent cleanings with detergent and water years of trouble free service from stainless steel products can be obtained Compact Mechanical Convection Ovens 5 1 Section 5 Maintenance Care and Cleaning of Stainless Steel cont 5 2 Some Stainless Guidelines to Consider The pH Factor Special Considerations Compact Mechanical Convection Ovens Warning Electrolysis can damage stainless steel This occurs when an object is allowed to rest directly on the surface of stainless steel trapping moisture that becomes oxygen starved but is surrounded by water containing oxygen Distilled water is recommended Please note if this water is very pure it may be corrosive to stainless When filling a bath or incubator always a
17. ith a constant speed fan that circulates heated air rapidly throughout the chamber The metal cover shields the fan and protects against splattering in the event that any material is accidentally spilled in the area of the fan Chamber temperature is conveniently monitored via an LED display on the control panel To guard against over temperature conditions a factory set hi limit thermostat is an integral part of the electrical system One inch thick silica based insulation in the double walls of the chamber helps retain chamber heat The interior walls of the chamber are stainless steel and the shelves are chrome plated steel for ease of maintenance and clean up Precision Compact Ovens have a steel exterior finished in baked enamel and are rigidly constructed for long troublefree service These instructions contain important operating and safety information The user must carefully read and understand these instructions before using the oven Your unit has been designed to optimize function reliability safety and ease of use It is the user s responsibility to install the oven in conformance with local electrical codes Thermo Scientific Compact Mechanical Convection Ovens 1 1 Thermo Scientific Section 2 Specifications Power Requirements Model PR305225M 120 Volts 50 60 Hz 10 Amps 1200 Watts Model PR305220M PR305220MCN 240 Volts 50 60 Hz 5 Amps 1200 Watts Overall Dimensions 18 7 16 W x 13 9 16 D x 25
18. l times e The oven heater is in the bottom of the unit Surface temperatures at the bottom cover of the unit may be higher than set point temperature For example A plastic container on the heater cover may become hot enough to melt burn the container at settings below the melting point of plastic Do not place items on the heater cover Thermo Scientific Thermo Scientific Section 4 Operation OFST ON HI LIMIT OFF TEMPERATURE TEMPERATURE CONTROL 1 2 3 4 5 6 Figure 4 1 Control Panel 1 POWER SWITCH Turns unit on green status lamp lights and off 2 HI LIMIT STATUS LAMP Lights when the hi limit thermostat is activated It goes out when oven reverts to a safe operating range 3 CALIBRATION POTENTIOMETER Utilizing a jeweler s screwdriver the temperature readout can be adjusted 4 LED DISPLAY Displays current chamber temperatures 5 TEMPERATURE CONTROL THERMOSTAT Raises and lowers temperatures 6 HEATERS STATUS LAMP Lights when heaters are energized Warning Do not use in the presence of flammable or combustible materials or explosive gases Do not use in the presence of pressurized or sealed containers fire or explosion may result causing death or severe injury A Caution It is the user s responsibility to monitor oven action when setting and maintaining operating temperature oven failure may occur with possible property damage and or
19. lves including the bottom one 3 Remove bottom cover fan shield and blower fan 4 Accessing the unit from the bottom remove motor and bracket assembly Disconnect wires 5 Remove shaft extension bottom fan and motor bracket from old motor and reinstall on new replacement motor 6 Re install motor assembly into unit in reverse order of removal 7 Reconnect wires 8 Re install shelves Make sure that bottom shelf is securely in place to prevent access to the heater area Thermo Scientific Compact Mechanical Convection Ovens 5 7 Section 5 Maintenance Temperature Readout A temperature readout calibration potentiometer 3 is located in the upper Calibration left hand corner of the LED display and is indicated by the word OFST Use a jeweler s screwdriver to make adjustments OFST ON HI LIMIT OFF TEMPERATURE TEMPERATURE CONTROL 1 2 34 Figure 5 1 Control Panel 1 Have a digital thermometer known reliable thermocouple Type K or T and the jeweler s screwdriver on hand 2 Insert the thermocouple sensor through the outside top vent hole and position it in the center of the oven chamber 3 Set oven temperature to a desired setpoint and turn on the power 4 Allow temperature to stabilize for at least 2 hours before making any adjustments 5 Compare the chamber temperature on the digital thermometer to the temperature on the oven readou
20. same sequence 3 Compress holding tabs on switch and push out 4 Insert new switch from the front When inserting follow same orientation of pin numbers as on the switch just removed 5 Attach wires in SAME SEQUENCE as originally attached To verify that correct sequence has been followed refer to wiring schematic 6 Reverse remainder of procedure Thermo Scientific Compact Mechanical Convection Ovens 5 5 Section 5 Maintenance 5 6 Replacing Status Lamp Bulb Assembly Replacing Hi Limit Thermostat Replacing Heater Compact Mechanical Convection Ovens me me With unit on its side as in the preceding remove bottom plate and save screws Note plastic lamp unit that houses bulb Be alert that lens will pop out in next step Grasp lamp unit and pull a fraction of an inch toward the attached wires Lens will pop out the front Save Cut wires and remove lamp unit Discard To install new pilot lamp unit splice the two wires of the assembly to previously cut wires using insulated crimp connectors Re install lens Re install bottom plate Remove back panel and carefully remove insulation for subsequent reinstallation Save Hi limit thermostat is mounted on back of inner chamber wall Unscrew 2 screws and nuts holding wires Save Remove screw securing thermostat to back of inside wall Reverse preceding procedure to install a new hi limit thermostat Heater is located in bottom of chamber Be
21. t 6 Insert jeweler s screwdriver in calibration hole and adjust the oven readout to match the thermometer reading Turn potentiometer clockwise to increase reading and counterclockwise to decrease it 7 Take two additional readings within an approximate 30 minute time span and make any necessary adjustments to the potentiometer This takes into account any temperature variations that might exist within the oven and the time delay in responding to such factors by the temperature sensors 5 8 Compact Mechanical Convection Ovens Thermo Scientific Thermo Scientific Section 6 Replacement Parts DESCRIPTION Cordset 120V Cordset 240V Cordset 240V China Door Catch Door Handle Fan Axial 2 Fan Shield Feet Rubber 4 Fuse 8 A PR305220M PR205220MICN 2 Fuse 15 A PR305225M Fuse Holder PR305225M Fuse Holder PR305220M PR205220MCN Gasket Grommet 2 Heaters PR305225M 120V R1483X1 R1483X2 R1881X1 160 136 C C C 600 124 00 a 790 247 00 340 283 00 PR305220M PR205220MCN 240V 340 296 00 Knob Thermostat Motor PR305225M 120V Motor PR305220M PR205220MCN 240V Shelves Kit Status Lamp Base 2 Status Lamp Lens Amber Status Lamp Lens Red Switch Power 120V Switch Power 240V Temperature Sensor RTD Thermometer Digital Thermostat Control Thermostat Hi Limit Compact Mechanical Convection Ovens 6 1 Section 6 Replacement Parts Ordering Procedures 6 2
22. ts Cleaning Methods Thermo Scientific Section 5 Maintenance Anti fungal and anti bacterial additives are permissible to use as long as the pH of the aqueous solution is kept within the range of 7 to 9 These are available through laboratory distributors Be sure to confirm that they are not harmful to stainless steel Do not use any metallic pads Instead for stubborn stains use a plastic light duty cleansing pad and rub gently in the direction of the metal grain If stains continue to persist use one of the following chemicals and methods e Any of a variety of scale removers available at local supermarkets or hardware stores used for the cleaning of coffee marks humidifiers or vaporizers e A 15 to 35 phosphoric acid solution available from laboratory supply distributors for scale and rust removal Allow solution to soak the surface affected until rust and scale is loosened Immediately follow with a clean water rise e Citric acid based cleaners Bathroom tub and tile cleaners Regardless of the approach utilized always follow the manufacturer s directions and allow the chemicals to do the cleaning with minimal scrubbing Always follow cleanings with a clean water rinse Air dry Caution Extreme care must be taken when handling these materials Always work in an area with adequate ventilation Use the precautions as outlined in the Material Safety Data Sheet MSDS and the manufacturer s instructions for the
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