VWR International 89508-426 Manual

User Manual
VWR®Collection Models 89508-426
and 89508-428
Vacuum Oven
Operating and Maintenance Manual 7006291 • Rev. 0

VWR Collection
MANUAL NUMBER 7006291
0 -- 10/7/13 Original ccs
REV ECR/ECN DATE DESCRIPTION By
Preface
Vacuum Oven i
Models covered in this manual:
Catalog
Numbers
Model
Numbers Voltage Feature Size (cu ft)
89508-426 6291 120V Dial thermometer 0.7
89508-428 6292 120V Dial thermometer 2.3

VWR Collectionii Vacuum Oven
Preface
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. s
Caution All internal adjustments and maintenance must be performed by qualified service personnel. s
Material in this manual is for information purposes only. The contents and the product it describes are subject to
change without notice. VWR International makes no representations or warranties with respect to this manual.
In no event shall VWR be held liable for any damages, direct or incidental, arising out of or related to the use of
this manual.
©2013 VWR International, LLC. All rights reserved.

VWR Collection Vacuum Oven iii
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.
This product is required to comply with the European Union’s Waste Electrical & Electronic
Equipment (WEEE) Directive 2002/96/EC. It is marked with the WEEE symbol. VWR International
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
VWR’s compliance with this directive, the recyclers in your country and information on VWR
products will be available at www.thermofisher.com.
4Always use the proper protective equipment (clothing, gloves, goggles, etc.)
4Always dissipate extreme cold or heat and wear protective clothing.
4Always follow good hygiene practices.
4Each individual is responsible for his or her own safety.

Vacuum Oven ivVWR Collection
Table of Contents
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Unpacking and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Hose Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Thermometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Loading the Oven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Unloading the Oven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Purging the Chamber with Inert Gas . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Releasing the Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Maintaining Proper Vacuum Level . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Routine Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Care and Cleaning of Stainless Steel . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
The pH Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
Cleansing Agents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3
Special Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3
Cleaning Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4
Disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-5
Door Gasket Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-5
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 8
Section 7

Vacuum Oven 1-1VWR Collection
Section 1 Description
VWR Collection 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” (76mm) of glass wool insulation throughout helps
maintain temperature uniformity effectiveness. Temperature is controlled
by a hydraulic thermostat and can be read on the dial thermometer.
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.
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 shelf and a vessel being heated. Also, be sure that a
thermometer’s sensor element is in direct contact with the surface of the
center shelf when taking a reading. s

Vacuum Oven 2-1VWR Collection
Section 2 Safety Information
Your VWR Collection Vacuum Oven has been designed with function,
reliability, and safety in mind. It is your responsibility to install it in
conformance with local electrical codes. It is most important that the user
follow installation instructions exactly as written. Failure to do so is likely
to lead to improper operation, erroneous calibrations and possible damage
to the equipment. Use in the manner specified by the manufacturer. The
protection provided by the equipment may be impaired. Do not attempt
operation without this information.

Vacuum Oven 3-1VWR Collection
Section 3 Specifications
Electrical Requirements
89058-426 . . . .120 Volts, 50/60 Hz, 5.0 Amps, 600 Watts
89508-428 . . . .120 Volts, 50/60 Hz, 12.0 Amps, 1600 Watts
Temperature Range
All Models: Slightly above ambient to 220°C
Thermometer Type
Bimetallic dial type; range from 0°C to 300°C in 5°C increments
Chamber Dimensions
89508-426:
. . . . . .10"W x 12"D x 10"H (25 x 30 x 25 cm)
89508-428:
. . . . . .14"W x 20"D x 14"H (36 x 51 x 36 cm)
Overall Dimensions:
89508-426:
19-7/8"W x 16"D x 16-1/4"H (50 x 40 x 41 cm)
89508-428:
25"W x 25"D x 22"H (64 x 64 x 56 cm)
Volume
89508-426 . . . . . . . . . . .0.7 cubic feet (19.8 liters)
89508-428 . . . . . . . . . . . . .2.3 cubic feet (65.1 liters)
Net Weight
89508-426 . . . . . . . . . . . . . . . . . . . . .83 lbs. (38 kg)
89508-428 . . . . . . . . . . . . . . . . . . . .150 lbs. (68 kg)

3-2 Vacuum Oven VWR Collection
Section 3
Specifications
Environmental Conditions
Indoor use only
Operating: 15°C to 40°C
Humidity: 20% to 80%
Voltage Fluctuation: ±10% of nominal
Installation Category II (overvoltage) in accordance with IEC 664.
Pollution Degree 2 in accordance with IEC 664.
Altitude Limit: 2,000 meters.
Storage: -25°C to 65°C, 10% to 85% RH

Vacuum Oven 4-1VWR Collection
Section 4 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 carrier from any liability for damage.
You must call for a damage inspection promptly. s
Place the unit where it will be operated, away from drafts and wide
variations in ambient temperature. It 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.
Connect a 1/4-inch ID 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.
If operation will include replacing the vacuum in the chamber with an
inert gas such as carbon dioxide or nitrogen, connect a 1/4-inch ID 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.
Location
Hose Connections

4-2 Vacuum Oven VWR Collection
Section 4
Unpacking and Installation
Electrical
Requirements
The unit is supplied with a 3-wire line cord. It 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.
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 post.
Turn the power switch OFF and insert the plug into the outlet.
Note Disconnect unit from power source when not in use. s
Caution Disconnect plug from electrical outlet before attempting any
maintenance or repair on this unit. s
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.
Thermometer

Vacuum Oven 5-1VWR Collection
Section 5 Features
1. Power Switch: Power is on to the unit when this switch lamp is lit. (To
reset the circuit breaker, turn this switch to Off, then On.)
2. Control Thermostat and Status Lamp: Adjust 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.
3. Vacuum Gauge: Displays chamber level to 30-inches of mercury.
4. Vacuum/Vent Valve: 3-way valve draws, holds or releases a vacuum.
5. Hose Connectors: Marked "EVACUATE" and "VENT" for 1/4"
flexible tubing to connect to a gas source or vacuum pump.
Control Panel
POWER
TEMPERATURE
CHAMBER VACUUM
CLOSED
EVAC VENT
EVACUATE VENT
5
4
3
2
1

Section 6 Operation
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
containers - fire or explosion may result, causing death or severe injury. s
Caution Do not heat any substance above a temperature which will cause
it to emit toxic fumes - death or severe injury may result. s
If 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 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 consistently 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.
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 1 inch
away from chamber walls and resting directly on the shelves. DO NOT
PLACE FLAMMABLE SOLVENTS OR VAPORS in the oven and avoid
spilling acids. Be careful not to heat substances above their autoignition
temperatures.
While the oven door is open, apply high temperature vacuum grease to the
door gasket. Close the door and push the power switch ON. If oven
temperature was not previously set, review above at “TEMPERATURE
CONTROL” to set the desired operating temperature.
Vacuum Oven 6-1VWR Collection
Temperature Control
Loading the Oven

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.
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. s
If the vacuum is to be replaced by ambient air, disconnect any tubing
attached to the hose connector marked "VENT" and rotate the
vacuum/vent valve to its "VENT” setting.
Use only a non-combustible, nonflammable, non-corrosive gas - such as
nitrogen or carbon dioxide - if application requires replacing the vacuum
with an inert gas.
Connect 1/4-inch ID 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:
89508-426: Interior volume is 0.75 cubic feet.
89508-428: Interior volume is 2.30 cubic feet.
When the bake is completed and the vacuum has been released or replaced
as described earlier, turn 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.
6-2 Vacuum Oven VWR Collection
Section 6
Operation
Maintaining Proper
Vacuum Level
Releasing the
Vacuum
Purging the Chamber
with Inert Gas
Unloading the Oven

Section 7 Maintenance
Note Make no attempt to service or repair a VWR product under warranty
before consulting your VWR 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. s
Caution Service must be performed by qualified service personnel only. s
Caution Disconnect plug from electrical outlet before attempting any
maintenance or repair of this unit. s
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 shelf 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).
Vacuum Oven 7-1VWR Collection
Routine Cleaning

7-2 Vacuum Oven VWR Collection
Section 7
Maintenance
Care and Cleaning of
Stainless Steel
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. s
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. s
Stainless steel is an alloy of steel with chromium and nickel that increases
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.
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.
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 40mg/liter) disodium 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 < 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 <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.
Guidelines
The pH Factor

Vacuum Oven 7-3VWR Collection
Section 7
Maintenance
Special
Considerations
Warning If it is necessary to use the following chemicals, limit exposure
time to a maximum of 3 hours. s
Always clean surfaces immediately after use.
Caution Never use the following on stainless steel:
• Aqua regia
• Ferric chloride
• Iodine
• Sodium 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.
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 - but be sure to CONFIRM that
they are not harmful to stainless steel.
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
Cleansing Agents

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.
Caution Extreme care must be taken when handling the materials
described below. Always work in an area with adequate ventilation. Use the
precautions as outlined in the Material Safety Data Sheet (MSDS) and the
manufacturer instructions for the product being utilized. Also, follow the
personal protection index found in the Hazardous Materials Information
System (HMIS) section of the MSDS. s
If stains continue to persist, use one of the following chemicals and
methods:
• Any of a variety of “scale removers” available at local supermarkets or
hardware stores used for the cleaning of coffee marks, humidifiers or
vaporizers.
• 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.
• Citric acid based cleaners.
• Bathroom tub and tile cleaners.
• A mixture of 20% nitric acid and 1.5% hydrofluoric acid (or 1.5%
hyrochloric acid). Swab solution on surface allowing it to remain until
rust is loosened. Immediately follow with a clean water rise. (This
method should ONLY be used if SEVERE rust and scale stains are
present.)
• Oxalic acid 2% to 5% in warm water. Swab solution on surface
allowing it to remain until rust is loosened. Immediately 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 manufacturerʼs
directions and allow the chemicals to do the cleaning with MINIMAL
scrubbing.
Always follow cleanings with a clean water rinse. Air dry.
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. s
7-4 Vacuum Oven VWR Collection
Section 7
Maintenance
Cleaning Methods

The materials listed below are effective when used for disinfection
purposes.
• Glutaraldehyde
• Alcohol
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. s
Apply a high-quality vacuum grease to the door gasket frequently,
especially before initiating a vacuum. Also apply high temperature vacuum
grease to the gasket after shutdown, if the oven will not be used in the near
future.
Vacuum Oven 7-5VWR Collection
Section 7
Maintenance
Disinfection
Door Gasket
Lubrication

Section 8 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.
Caution Before starting any repair, disconnect power cord from outlet. s
Vacuum Oven 8-1VWR Collection
SYMPTOM POSSIBLE CAUSES OF PROBLEM
Excessive vacuum leaks:
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.
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).