Thermo

SCIENTIFIC

Low Cost

Vacuum Ovens

Model No.

3608,3608-1CE

3608-5, 3608-6CE

3618,3618-1CE

3618-5,3618-6CE

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LT1495X2 . 1/12/07
Table of Contents

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Note

When operating in a vacuum, there is

no transfer of heat from the evacuated chamber interior to objects within

the chamber unless they are resting

directly upon one of the shelves-do

not put insulating material between a

shel{ and a vessel being heated.

Also, be sure that a thermometer's

sensor element is in direct contact

with the sudace of the center shelf

when taking a reading.

Description

Thermo Scientific Vacuum Ovens are designed for drying

media under carefully controlled conditions-in a normal

atmosphere, a vacuum of up to 30 inches Hg, or an inert

gas atmosphere.

The oven is primarily used for desiccating, vacuum

embedding, plating and electronic component processing.

Non-corrosive, nonflammable gases such as nitrogen and

carbon dioxide can be used in the oven.

All controls and connections (except electrical power) are

located on the front vertical panel-these include lighted

power switch, vacuum gauge, temperature control, vacuum control valve and nickel-plated hose connectors.

Uniform radiant wall heat, with no internally exposed

heaters, optimizes chamber space. 3" (76 mm) of glass

wool insulation throughout helps maintain temperature

uniformity effectiveness. Temperature is controlled by a

hydraulic thermostat and can be read on a dial thermometer or LED display.

The chamber of the unit is not designed for exposure to

concentrated solvents, oils, concentrated acids or dilute

sodium hydroxide.

Vacuum levels are precisely held between 0" and 30" of

mercury.

The silicone door gasket assures a tight seal at all vacuum levels. A high strength tempered glass window allows

full view of oven contents. Two aluminum shelves provide

good heat conduction to samples. The shelf assembly

removes for easy cleaning.

Model Designations and Their

Features

3608,3608-1CE,3618 and 3618-1CE: Models with dial

thermometer.

3608-5, 3608-6CE, 3618-5 and 3618-6CE: Models with

LED temperature display.

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Safety lnformation

Alert

A

o

Caution

Cautions alert you to a possibility of

risk of danger. Consult documentation

Caution

Cautions alert you to a possibility of

damage to the equiPment.

Note

Notes alert You

conditions.

to pertinent facts and

Caution

Hot surfaces alert you to a possibility

of personal injury if you come in contact with a surface during use or for a

period of time after use

Caution

Electrical shocks alert you to a possibility of personal injury if you come in

contact with live circuits while the unit

is plugged into a Power source

Your Thermo Scientific Vacuum Oven has been designed

with function, reliability, and safety in mind. lt is your

responsibility to install it in conformance with local electrical codes. lt is most important that the user {ollow installation instructions exactly as written. Failure to do so is likely to lead to improper operation, erroneous calibrations

ind possible damage to the equipment' Do not use in a

manner not specified by the manufacturer' The protection

provided by the equipment may be impaired' Do not

attempt operation without this information.

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Specifications

Electrical Requirements

3608, 360Q-5: 120 Volts, 50/60 Hz, 5.0 Amps, 600 Watts

3608-1CE, 36Q8-6CE: 240 Volts, 50/60 Hz, 2.5 Amps, 600 Watts

3618, 3618-5: 120 Volts, 50/60 Hz, 12.0 Amps, 1600 Watts

3618-1 CE, 3618-6CE: 240 Volts, 50/60 Hz, 6.7 Amps, 1600 Watts

Temperature Range

All Models: Slightly above ambient to 220'C

Volume

3608, 3608-1, 3608-5, 3608-6CE:0.7 cubic feet

(19.8 liters)

3618, 3618-1CE, 36't 8-5, 3618-6CE:

2.3 cubic feet (65.1 liters)

Thermometer Type

3608, 3608-1, 361 8, 361 8-1 :

Bimetallic, dial type; range from 0"C

increments

3608-5, 3608-6, 361 8-5, 361 9-6:

Net Weight

3608, 3608-1 CE, 3608-5, 3608-6CE:

increments 83 lbs. (38 kg)

361 8, 361 8-1 CE, 361 8-5, 361 8-6CE:

150 lbs. (68 kg)

to 300"C in 5"C

LED Display; range from 0"C to 300'C in 1"C

Chamber Dimensions

3608, 3608-1CE, 3608-5, 3608-6CE:10"W x 12"D x 10"H

(25 x 30 x 25 cm)

361 8, 361 8-1 CE, 361 8-5, 361 8-6CE:

14"W x 20"D x 14"H (36 x 51 x 36 cm)

Overall Dimensions:

3608, 3608-1CE, 3608-5, 3608-6CE:1 9-718"W x 16"D x

16-1/4'H (50 x 40 x 41 cm)

361 8, 361 8-1 CE, 361 8-5, 361 8-6CE:

25"W x 25"D x 22'H (64 x 64 x 56 cm)

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Environmental Conditions

Operating: 15'C to 4O"C;2Oo/o to 80"/o relative humidity' non-condensing'

tnrtuttution category ll (overvoltage) in accordance with IEC 664'

Pollution OegreJZ in accordance with IEC 664'

2,000 meters.

-25"C to 65"C

10% to 85% relative humiditY

Declaration of Conformity

ior 220lo 240 volt, CE models onlY)

We trereny declare under our sole responsibility

of the following standards:

EN 61000-3-2

EN 6'1000-3-3

EN 61326-1

EN 61010-1

EN 61010-2-010

Thermo Fisher Scientific

419 Sutton Road

Southend On Sea

Essex SS2 5PH

United Kingdom

Copies of the Declaration of Conformity

that this product conforms with the technical requirements

Limits tor harmonic current emissions

Limits for voltage fluctuations and flicker

Etectrical equifment {or measurement, control' and

laboratory use; Part l: General Requirements

Safety requirements for electrical equipment for

measurement, control, and laboratory use'

Part l: General Requirements

part ll: Particular requirements for laboratory equipment for

the heating ol materials

pertheprovisionsoftheElectromagneticCompatibilityDirectiveS,/336/EEC,asamendedbyg2/31/EEC

and 93/6,/EEC, and per the provisions of the Low voitage Directive 73/23/EEC, as amended by 93/68/EEC'

TheauthorizedrepresentativelocatedwithintheEuropeanCommunityis:

are available uPon request

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Unpacking and I nstallation

Shipping Carton

The shipping carton should be inspected upon delivery.

When received, carefully examine for any shipping damage before unpacking. lf 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 {ound prompfly report it to

the carrier and request a damage inspection prompfly.

IMPORTANT: Failure to request an inspection of damage

within a few days after receipt of shipment absolves the

carrier from any liability for damage. You must call for a

damage inspection promptly.

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Location

Place the unit where it will be operated, away from drafts

and wide variations in ambient temperature. lt should be

near a power source that matches the unit nameplate

requirements. Allow clearance of a minimum of 2" around

the unit for free air convection, hose/accessory attachment and user-access. DO NOT put the oven on top of or

underneath another oven, or on a combustible surface.

Hose Connections

Connect a 114-inch lD vacuum hose to the left hose connector on the control panel that is marked "EVACUATE".

Connect the other end of the hose to a vacuum pump.

lf operation will include replacing the vacuum in the chamber with an inert gas such as carbon dioxide or nitrogen,

connect a 1l4-inch lD flexible hose to the right hose connector that is marked 'VENT" and to the regulator for the

gas supply. DO NOT use combustible, flammable or corrosive gases.

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Note

Leave unit disconnected when not in

USE.

Gaution

Disconnect plug from electrical outlet

before attempting any maintenance or

repair on this unit.

Electrical Requirements

The unit is supplied with a 3-wire line cord. lt should be

plugged into an outlet supplying the correct voltage for the

unit and designed for 3-prong plugs.

For an outlet designed to accept 2-prong (ungrounded)

plugs, the best recommendation is to have a qualified electrician replace it with a new grounded outlet.

lf 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 post.

Turn the power switch OFF and insert the plug into the outlet.

Thermometer

For models using the dial thermometer-3608, 3608-1CE,

3618 and 3618-1 CE-place the thermometer so that the

sensing element is in direct contact with the top shelf. The

dial should be easily visible through the glass door.

Models with the LED display of temperature-3608-5, 3608-

6CE,3618-5 and 3618-6CE-are easily identifiable with the

LED positioned just below the power switch. Ensure that the

RTD block is installed and making contact with the shelf.

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Features

Control Panel - Models with Dial Thermometer

POWER

TEMPERATURE

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CHAMBER @VACUUM -o

CLOSED

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POWER SWITCH: Power is on to the unit when this

switch lamp is lit. (To reset the circuit breaker, press this

switch to off, then on.)

CONTROL THERMOSTAT & STATUS LAMP:Adjust manually to control oven temperature. A permanently-set

bimetallic thermostat (not on the panel) limits oven temperalure at 250'C should the control thermostat fail.)

VACUUM GAUGE: Displays chamber level to 30-inches of

mercury.

VACUUM/VENT VALVE: 3-way valve draws, holds or

releases a vacuum.

HOSE CONNECTORS: Marked' EVACUATE" and'VENT'

tor l14" flexible tubing to connect to a gas source or vacuum pump 

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2.

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Control Panel - Models with LED Readout

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POWER ffi

TEMPERATURE"C

TEMPERATURE

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CHAMBER VACUUM

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CLOSED

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EVACUATE VENT I 8

1. POWER SWITCH: Power is on to the unit when this switch

lamp is lit.(To reset the circuit breaker, press this switch to

off, then on.)

LED TEMPERATURE DISPLAY: Readout of temperature.

CONTROL THERMOSTAT AND STATUS LAMP: Adjusr

manually to control oven temperature. A permanently-set

bimetallic thermostat (not on the panel) limits oven temperature at 250"C should the control thermostat fail.

VACUUM GAUGE: Displays chamber tevet to 3O-inches of

mercury.

VACUUM/VENT VALVE: 3-way valve draws, hotds or

releases a vacuum.

HOSE CONNECTORS: Marked "EVACUATE" and "VENT"

tor 114" flexible tubing to connect to a gas source or vacuum pump.

4 **."-

6 --"

2.

3.

4.

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Caution

Do not use in the presence of flammable or combustible materials or explosive gases. Do not use in the presence

of pressurized or sealed containersfire or explosion may result, causing

death or severe injury.

Caution

Do not heat any substance above a

temperature which will cause it to emit

toxic fumes-death or severe injury

may result.

Operation

Temperature Control

lf it is necessary to set temperature before loading oven,

push the power switch ON and note that the power switch

light is lit. Rotate the thermostat knob to approximate the

desired setting. The heater status lamp will be steadily lit

until the chamber temperature approaches the thermostat

setting. Wait several heat cycles until the temperature has

stabilized.

Check the thermometer-dial or LED display-and rotate

the thermostat knob clockwise to raise the set point or

counterclockwise to lower it. After oven temperature has

stabilized, check the temperature again and make further

thermostat adjustments until the thermometer consistenily

shows the desired operating temperature. Push the

power-switch OFF and allow the oven to cool down, or, if

a batch is ready, the oven can be loaded immediately.

Loading the Oven

For units which utilize a dial thermometer, the thermometer can be removed and put back after loading if that is

more convenient. Note that the thermometer sensing element must be in direct contact with a shelf for an

accurate reading.

For best results, distribute the load evenly in the chamber,

at least 'l -inch away from chamber walls and resting

directly on the shelves. DO NOT PLACE FLAMMABLE

SOLVENTS OR VAPORS in the oven and avoid spiiling

acids. Be careful not to heat substances above their autoignition temperatures.

While the oven door is open, apply high quality vacuum

grease to the door gasket. Close the door and push the

power switch ON. l{ oven temperature was not previously

set, review above at "TEMPERATURE CONTROT'to set

the desired operating temperature.

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Maintaining ProPer Vacuum

Level

The vacuum level will decrease slightly over a period of

time. To bring it back up, rotate the vacuum/vent valve to

"EVACUATE" and start the vacuum pump.

When the vacuum gauge again shows the desired level,

rotate the vacuum/vent valve to the setting marked

"CLOSED" and shut off the vacuum pump'

Releasing the Vacuum

lf the vacuum isTo Oe replaced by ambient air, disconnect

any tubing attached to the hose connector marked

"VLruf" and rotate the vacuum/vent valve to its "VENT"

setting.

Caution

Do not pressurize the chamber

above atmosPheric Pressure-the

oven will not withstand a Positive

internal pressure. When the vacuum

gauge reads zero, shut the gas off'

Purging the Chamber with lnert

Gas

Use only a non-combustible, nonflammable, non-corrosive

gas-sjch as nitrogen or carbon dioxide-if application

requires replacing the vacuum with an inert gas'

Connect 1/4-inch lD tubing to the hose connector marked

"VENT" and connect the other end of the tubing to the

regulator at the inert gas source.

Start the gas flowing at no more than 5 psi' Rotate the

vacuum/vent valve to the "VENT" position and shut off the

regulator when the vacuum gauge reads zero (normal

atmospheric Pressure).

The oven does not require very much gas to fill the chamber:

3608, 3608M8 3608-1, 3608-5,3608-6: lnterior volume is

0.75 cubic feet.

3618, 3618-1, 3618-5,3618-6: lnterior volume is 2'30

cubic {eet.

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OpeRaroru

Unloading the Oven

When the bake is completed and the vacuum has been

released or replaced as described earlier, push the power

switch to OFF. Open the oven door and remove the dial

thermometer. Take the contents from the chamber and reinsert the thermometer with the sensing element in direct

contact with the center shelf.
Maintenance

Note

Make no attempt to service or repair

a Thermo Scientific Product under

warranty before consulting Your

Thermo Scientific dealer. After the

warranty period, such consultation is

still advised, especially when the

repair may be technically sophisticated or difficult. l{ assistance is needed

beyond what the distributor can provide, please call Customer Service at

800-553-0039. No merchandise

should be returned directly to the factory without obtaining a Return

Materials Authorization (RMA) number from Customer Service.

Caution

Refer servicing to qualified personnel.

Caution

Disconnect plug from electrical outlet

before attempting any maintenance or

repair of this unit.

Caution

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.

Routine Cleaning

Wash the cabinet with a solution of water and mild soap or

detergent to clean off surface dirt, marks or smudges.

Keep the vents clear of dust for free air circulation. This will

add to the service life of components.

The aluminum shel{ assembly should be washed with a mild

soap and water. Do not use abrasive or halogen-based

cleaners-they will damage the finish. Rinse thoroughly and

dry completely.

Wipe interior glass with an ammonia-based glass cleaner

and a soft, lint-free cloth.

Clean up spills inside the chamber as soon as possible to

prevent them from being baked on. When the oven is cool,

use hot soapy water and a soft cloth to clean the #304

stainless steel chamber. Do not use scouring pads with

metallic content, chlorine bleach or halogen-based cleaners.

(Special order units may come with stainless steel shelves,

in addition to the stainless steel interior.)

Care and Cleaning of Stainless Steel

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.

The Alloy Called Stainless

Stainless steells 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 film 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. u
Marruteruaruce

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.

Stainless Guidelines

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 add 2 to 40 ppm (20 to 40

mg/liter) disodium phosphate or sodium bicarbonate,

adjusting dosage to provide a pH value of 7 to 9. lf not

available, use clean, aerated sott tap water provided the

total solids concentration is < 500 PPM. We do NOT recommend using 18 meg-ohm deionized water. lf this is the

only source of treated water available, mix with regular

tap water at a 50/50 ratio.

The pH Factor

Check pH regularly. lf pH is <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. lf 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.

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Mnrrureruarvce

Special Considerations

WARNING: lf it is necessary to use the following chemicals, limit exposure time to a maximum of 3 hours.

Aluminum chloride E.D.T.A. Potassium permanganate

Barium chloride Ferrous chloride Potassium thiocyanate

Calcium chloride Lysol Sodium hypochlorite

Chlorinated Lime Mercury salts Stannous chloride

Citric acid (boiling) Phenol Tartaric acid

Dakin's solution

Always clean surfaces immediately after use.

BE ADVISED: Never use the following on stainless steel:

Aqua regla

Ferric chloride

lodine

Sodlum acid

Sodium azide

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.

Cleansing Agents

Anti{ungal and anti-bacterial additives are permissible

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-but be sure to CONFIRM that

they are not harmful to stainless steel.

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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 product being

utilized. Also, follow the personal protection index found in the Hazardous

Materials lnformation System (HMIS)

section of the MSDS.

Note

The use and disposal of these chemicals may be regulated by your local

city codes; consult those regulations

before of disposing of these materials.

Note

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.

Marruterulruce

Cleaning Methods

Do not use any metallic pads. lnstead, for stubborn stains,

use a plastic light-duty cleansing pad and rub GENTLY in

the direction of the metal grain.

lf stains continue to persist, use one of the following

chemicals and methods:

. Any o{ a variety of "scale removers" available at

local supermarkets or hardware stores used for

the cleaning of coffee marks, humidifiers or

vaporizers.

o [ 15% to 35% phosphoric acid solution available from laboratory supply distributors for scale

and rust removal. Allow solution to soak the surface aflected until rust and scale is loosened.

lmmediately follow with a clean water rise.

. Citric acid based cleaners.

. Bathroom tub and tile cleaners.

o ff mixture oI 2Ooh nitric acid and 'l .5% hydrofluoric acid (or 1.5"/o hyrochloric acid). Swab solution

on surface allowing it to remain until rust is loosened. lmmediately follow with a clean water

rise. (This method should ONLY be used if

SEVERE rust and scale stains are present.)

. Oxalic acid 2o/o to 5% in warm water. Swab solution on surface allowing it to remain until rust is

loosened. lmmediately follow with a clean water

rise. (This method should ONLY be used if

SEVERE rust and scale stains are present.)

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.

Materials Effective in Disinfecting

. Glutaraldehyde

Alcohol

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MnrrureruaHce

Door Gasket Lubrication

Apply a high-quality vacuum grease to the door gasket

frequently, especially before initiating a vacuum. Also

apply vacuum grease to the gasket qfter shutdown, if the

oven will not be used in the near futdre.

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Troubleshooting

There are few oven parts that will require repair. In case of a malfunction, the control thermostat, limit thermostat, heater status lamp, heaters, power switch, vacuum/vent valve and vacuum gauge are fairly easy to

replace.

Use this troubleshooting guide to find a possible source of any problem,then test and/or make replacement as

described.

Gaution

Before attempting any repair, disconnect power cord from ouilet.

SYMPTOM

Excessive vacuum leaks:

POSSIBLE CAUSES OF PROBLEM

Check door gasket and door alignment.

Check for loose connections/fittings..

Check the vacuum/vent valve-order a replacement if it is leaking.-

Won't vent or evacuate: Check for open fittings, large leaks.*

Check vacuum/vent valve; replace if bad.*

Check tubing & fittings for obstruction.-

Apply high quality vacuum grease to door gasket.

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Vacuum gauge not at zero

when oven door is open:

Replace the vacuum gauge."

Power switch does not light: Check power cord and outlet for power.

Check main fuses inside back cover.

Replace the power switch if necessary.

Heater status lamp is out

when cold oven is heating up:

Replace the heater status lamp.

The thermostat is set at

maximum and thermometer does

not register or only registers

partial heating:

Move thermometer in contact with shelf.

Check both thermostats-replace if bad.

Make ohmmeter check of heater resistance and replace

faulty heater(s). J

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E

Servicing

Caution

Push the power switch off and

unplug the oven before attempting

any service or repairs on the unit.

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Control Thermostat Replacement

Disconnect power and remove the control panel, back

panel (edge screws) and insulation.

. Locate the thermostat bulb from the back of the

oven attached to the right-side heater on the

vacuum chamber. Slide the bulb from its bracket.

. Remove the thermostat knob by loosening the

setscrew and take the old thermostat from the

control panel. Move the 3 leads to new thermostat, referring to the wiring schematic iI necessary.

. lnstall the new thermostat on the control panel

and tighten the knob onto it. Uncurl enough sensor tubing to slide the new bulb into its bracket

with several inches of slack. Route the sensor

tubing to prevent electrical shorts to other components.

. Replace the insulation and the back panel.

Replace the control panel, power up and test

run the oven.

Heater Status Lamp

Replacement

Disconnect power. Refer to the wiring schematic.

. Remove the status lamp lead at the terminal

block and thermostat.

Push the new lamp in place. Attach the new

lamp leads to the thermostat and terminal block.

Power up and test the new status lamp.

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Note

The valve body has an antirotation/stop tab. This needs to be

located in the top right quadrant

when facing the control panel.

Note

All tubing lo be l14" stainless; all

threaded connection to be sealed

with thread sealer.

Female Flun-Tee

Vacuum Gauoe

1/4' NPT S S. lMale Elllow

1/4" NPT Male Connecior

3-Way Hand Va ve

1,r4" NFT Brass i\,4ale FlSow

114" NPI lrerrale Connectcr

114" Hose Barh \

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Vacu um/Vent Valve Replacement

Disconnect power. Referring to the upcoming piping diagram

below, loosen the tubing from 3 compression fittings on the

vacuum/vent valve on the control panel.

. Remove the control panel valve handle by loosening the hex setscrew. Then unscrew the valve

retaining nut on front of the panel and take the old

valve from the back of the panel.

. Remove the 2 elbows and the straight connector

from the valve body and install on the new valve

using a thread sealant.

. Remove the valve handle from the new valve body.

lnstall the new valve in the panel and tighten the

retaining nut. Replace the valve handle and tighten

the setscrew.

Connect the valve assembly to the vacuum gauge

tubing and compression fittings.

Draw a vacuum and check for leaks.

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SeRvtctruc

Vacuum Gauqe RePlacement

After disconnecting pow6r and removing the control

panel, remove copper tubing from both compression fitiing" on the vacuum gauge-refer to the piping diagram

on previous Page if necessary'

. Remove the T-fitting from the back of the gauge

and take otf the gauge retaining bracket by

removing the two thumbnuts' Pull the old gauge

out from the front of the control panel'

. lnstall the new gauge in the panel and replace

the retaining bracket with thumbnuts'

. Clean old sealant from all male threads and

apply new sealant' lnstall the T{itting on the

back of the new gauge and attach tubing with

compression fittings to the gauge'

Replace the control panel, draw a vacuum and

check for leaks.

Back Panel ComPonents

fti-t-imit Thermostat Replacement

Disconnect power and remove the back panel (edge

screws) and'insulation from around components' Locate

the bimetallic limit thermostat on the back of the oven

chamber.

. Remove the nut holding the thermostat in place'

Disconnect the leads from it and attach them to

the new thermostat'

. Secure the new thermostat onto the back of the

oven chamber' Replace insulation and the back

panel, then power up and test run the oven'

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SeRvrcrruc

Fusible Link Replacement

Disconnect power and remove the back panel (edge screws)

and back insulation. Locate the bimetallic limit thermostat on

the back of the oven chamber.

. Disconnect the fusible link from the bimetallic thermostat and control thermostaVterminal block as connected. This is the wire assembly with the high temperature sleeving on it.

. Connect the new fusible link to the bimetallic thermostat and control thermostaVterminal block.

Replace the insulation and back panel, then power

up and test the oven.

Heater Replacement

Disconnect power and remove the back panel (edge screws)

and insulation Jrom the back and sides. Note that oven model

3608 has 2 heaters, one located on each side of the chamber; 3618 models have 4 heaters,2located on each side.

. For 3618 models, the oven housing must be

removed. The oven housing is held by screws

around the bottom edges. Lift it off and remove the

rest of the insulation.

For all models, unscrew the heater brace nuts to

remove heater braces. Pull the leads from heater

terminals and test each heater for shorts or low

resistance at the heating element sheath. An ohmmeter resistance reading that diflers greatly from 48

ohms for Model 3608 or 36 ohms for Model 3618,

indicates a faulty heater.

lnstall a new or original heater with terminals facing

down, using a new heater brace if a new heater is

installed. Attach leads to the heater, so that wires do

not touch any heated surJaces (see the upcoming

wiring schematic). Tighten mounting nuts securely

using a nickel based antisieze on the threads.

Replace the oven housing and front insulation and

repack side as well as back insulation, and replace

the back panel.

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23
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Do not let petroleum, silicone oil or

grease contact the gasket or mounting groove.

Door Gasket Repairs

Door Gasket Replacement

After pulling the old gasket from its groove, remove all dirt

and foreign matter from the groove and from the mating

surface on the oven.

. Press the new gasket onto the mounting surface

in the middle of the top section. Press top corners into place, then the sides. Next, fit the bottom corners, then the bottom section into place.

Press and spread the gasket to set it solidly in

the door groove.

. Close the door to help seat the gasket. Open the

door and apply a high-quality vacuum grease to

the gasket. Evacuate the oven while pressing on

the door to seat the gasket firmly.

Door Alignment

lnspect the door-to-gasket seal to find where the door is

out of alignment. Note that there are 2 (inner and outer)

sets of hinge bolts.

. Adjust vertical door position by loosening inner

hinge-to-oven bolts. Tighten them securely when

the door is straight.

. Adjust gasket compression tolerance (in/out

movement) by the outer hinge-to-door bolts,

then tighten them securely.

. After adjustment is made, check it by opening

and closing the door several times. Re-grease

the gasket and test the seal by evacuating the

oven. (Make further adjustments if necessary.)

Z+
b

DESCRIPTION

Cordset

Door Gasket

Glass Door

Heater

Heater Braces

Rubber Feet

Shelf

Status Lamp Base

Status Lamp Lens

Switch, Power (120V)

Switch, Power (240V)

Thermometer, Dial

Thermometer, LED

Thermostat, Bimetallic

Thermostat, Hydraulic

Thermostat, Knob

Transformer

Vacuum Gauge

Vacuum Gauge

Vacuum/Vent Valve

Fuse, Main

Fuse, Transformer

Thermal Fuse

RTD

Replacement Parts

MODELS

3608, 3608-1 CE,

3608-5,3608-6CE

cqx72 (3608, -s)

cRX70 (3608-1CE, -6CE)

530-1 58-00

540-1 81 -00

340-331-00

014-247-00

790-225-00

810-439-00

PL1483X2

360-235-00

440-35e-00 (3608,-5)

440-292-00 (3608- 1 CE,-6CE)

91 0-01 7-00 (3608,-1 CE)

91 0-1 26-00 (3608-5, -6CE)

920-416-00

920-223-OO

560-223-00

TN1496X1 (3608-s)

TN1495X2 (3608-6CE)

660-1 03-00 (3608,-1 CE)

660-097-00 (3608-5, -6CE)

950-1 25-00

264306 (3608, -5)

7 1 0-0022 (3608-1 CE, -6CE)

FZX35 (3608-5, -6CE)

wM1495X2

41 0-667-00 (3608-5, -6CE)

MODELS

3618,3618-1CE,

3618-5,3618-6CE

cRX73 (3618, -5)

cRX70 (3618-1CE, -6CE)

530-1 59-00

540-1 82-01

340-1 71 -00

583-657-00

790-078-00

810-440-00

PL1 496X2

360-235-00

440-359-00 (3618,-s)

440-292-00 (361 8-1,-6)

9'r0-017-00 (3618,-1)

91 0-1 26-00 (361 8-5,-6)

920-416-00

920-223-00

560-223-00

TN1496X1 (3618-5)

TN1496X2 (3618-6CE)

660-1 03-00 (3618,-1)

660-097-00 (361 8-5,-6)

950-1 25-00

266058 (3618, -s)

261 575 (361 8-1 CE, -6CE)

FZX35 (3618-5, -6CE)

wM1496X18

410-667-00 (361 8-5, -6CE)

2i:
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Ordering Procedures

Please 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 we ask that you check

first with your dealer. lf the dealer cannot handle your

request, then contact our Customer Service Department

at 563-556-2241 or 800-553-0039.

Prior to returning any materials, please contact our

Customer Service Department for a "Return Materials

Authorization" number (RMA). Material returned without

an RMA number will be refused.

(

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TWo Year Limited Warranty

This Thermo Scientific product is warranted to be free of defects in materials and workmanship for two (2)

years from the tirst to occur ot (i) the date the product is sold by the manuiacturer or (ii) the date the product is

purchased by the original retail customer {the "Commencement Date"). Except as expressly stated above, the

MANUFACTURER MAKES NO OTHER WARRANTY EXPRESSED OR IMPLIED, WITH RESPECTTOTHE

PRODUCTS AND EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES, INCLUDING BUT NOT LIMITED

TO, WARRANTIES OF DESIGN, MERCHANT ABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

An authorized representative of the manufacturer must perform all warranty inspections. ln the event oi a

defect covered by the warranly, we shall, as our sole obligation and exclusive remedy, provide free replacement parts to remedy the defective product. ln addition, lor products sold within the continental United States

or Canada, the manufacturer shall provide free labor to repair the products with the replacement parts, but

only for a period of ninety (90) days from the Commencement Date.

The warranty provided hereunder shall be null and void and without further force or effect if there is any (i)

repair made to the product by a party other than the manufacturer or its duly authorized service representative, (ii) misuse (including use inconsistent with written operating instructions for the product), mishandling,

coniamination, overheating, modification or alteration of the product by any customer or third party or (iii) use

of replacement parts that are obtained from a party who is not an authorized dealer of Thermo Scientific products.

Heating elements, because of their susceptibility to overheating and contamination. must be returned to the

factory and if, upon inspection, it is concluded that Jailure is due to {actors other than excessive high temperalure or conlaminalion, the manufacturer will provide warranty replacement. As a condition to the return of any

product, or any constituent part thereof, to the factory, it shall be sent prepaid and a prior written authorization

from the manuJaclurer assigning a Return Materials Number to the product or part shall be obtained.

IN NO EVENT SHALL THE MANUFACTURER BE LIABLE TO ANY PARTY FOR ANY DIRECT, INDIRECT,

SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OR FOR ANY DAMAGES RESULTING FROM

LOSS OF USE OR PROFITS, ANTICIPATED OR OTHERWISE, ARISING OUT OF OR IN CONNECTION

WITH THE SALE, USE OR PERFORMANCE OF ANY PRODUCTS, WHETHER SUCH CLAIM IS BASED ON

CONTRACT, TORT (tNCLUDING NEGLTGENCE), ANY THEORY OF STRICT LIABILITY OR REGULATORY

ACTION.

For the name of the authorized Thermo Scientific product dealer nearest you or any additional information, contact us:

2555 Kerper Blvd., Dubuque, lowa, 52004-0797

Phone: 563-556-2241 or 1 -800-553-0039

Fax: 563-589-051 6

E-mail : mkt @thermofisher.com

Web: www.thermo.com

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