NAPCO 5831 User manual

Operator's Manual
NAPCO®
Vacuum Oven
Model 5831
Precision
170 Marcel Drive
Winchester, VA 22602
USA
Phone: [phone]
Toll Free: 800-621-8820
FAX: [phone]
Manual P/N 36100106 (34000727)
Rev. D Dated 02 December,2003

II
NOTICE
THE MATERIAL IN THIS MANUAL IS FOR INFORMATION
PURPOSES ONLY. THE CONTENTS AND THE PRODUCT IT
DESCRIBES ARE SUBJECT TO CHANGE WITHHOUT NOTICE.
NAPCO MAKES NO REPRESENTATIONS OR WARRANTIES WITH
RESPECT TO THIS MANUAL. IN NO EVENT SHALL NAPCO BE
LIABLE FOR ANY DAMAGES, DIRECT OR INCIDENTAL, ARISING
OUT OF OR RELATED TO THE USE OF THIS MANUAL.
For repair information or replacement parts assistance from the manufacturer,
call Customer Service using our toll free telephone number.
800-621-8820
540-869-9892
(FAX) 540-869-0130
This symbol indicates hazardous voltages may be present.
This symbol marks chapters and sections of this instruction manual which are
particularly relevant to safety.
When attached to the unit, this symbol draws attention to the relevant
section of the instruction manual.

III
INDEX DATE
REVISION STATUS
Initial releaseA 6/99
AMENDED PAGES NOTES
B8/99 11 Update parts list for new kit #'s
C 10/01 2 Removed reference to shelf clips
D 12/03 V,4 Added notices page, add instruction
to "hold the door closed until ..."

IV
Contents
Introduction ........................................................................................................................ 1
Unpacking and Damage..................................................................................................... 1
Installation and Adjustment .............................................................................................. 2
Specifications ..................................................................................................................... 2
Explanation of Controls ..................................................................................................... 3
Temperature Adjustment ................................................................................................... 4
Vacuum Operation ............................................................................................................. 4
Periodic Maintenance ........................................................................................................ 5
Door Gasket Compatibility (Chart)................................................................................... 6
Maintenance of Stainless Steel ......................................................................................... 7
Replacement Parts List.................................................................................................... 11
Wiring Diagrams ............................................................................................................... 12
Warranty ............................................................................................................................ 14

V
Warnings and Notices
Important: READ THESE NOTICES BEFORE INSTALLING THE UNIT
General Notices
AS A ROUTINE LABORATORY PRECAUTION, ALWAYS WEAR SAFETY GLASSES WHEN
WORKING WITH THIS APPARATUS.
MAINTAIN A MINIMUM OF 12 INCHES CLEARANCE BETWEEN THE OVEN AND ANY
COMBUSTIBLE SURFACES.
HEATERS ARE LOCATED ON BOTTOM OF CHAMBER. PLACING AN ITEM DIRECTLY
ON THE CHAMBER FLOOR MAY CAUSE OVERHEATING OF THE ITEM.
VACUUM PUMPS SHOULD NEVER BE TURNED OFF WHILE CONNECTED TO A SYSTEM
UNDER VACUUM. OIL BACK UP INTO THE LINES AND SYSTEM WILL OCCUR
NECESSITATING EXTENSIVE CLEAN UP.
USE EXTREME CARE MUST BE TAKEN WHEN HANDLING THE CLEANING MATERIALS
LISTED IN THIS MANUAL (SEE PAGES 7 & 8). ALWAYS WORK IN AN AREA WITH
ADEQUATE VENTILATION. USE THE PRECAUTIONS OUTLINED IN THE MATERIAL
SAFETY DATA SHEET (MSDS) AND MANUFACTURER'S INSTRUCTIONS FOR THE
PRODUCT YOU ARE WORKING WITH. FOLLOW THE PERSONAL PROTECTION INDEX
FOUND IN THE HAZARDOUS MATERIALS IDENTIFICATION SYSTEM (HMIS) SECTION
OF THE MSDS.
Electrical Warnings
CHECK VOLTAGE AND WATTAGE STAMPED ON THE DATA PLATE FOR COMPATIBILITY
BEFORE CONNECTING THE OVEN TO ITS POWER SOURCE. THE DATA PLATE CAN
BE FOUND NEAR THE POWER CORD. FIRST ENSURE THAT THE POWER SWITCH IS
IN THE "OFF" POSITION.
UNIT MUST BE DISCONNECTED FROM POWER SOURCE PRIOR TO SERVICING. IT IS
RECOMMENDED THAT ALL SERVICE BE PERFORMED BY QUALIFIED SERVICE
PERSONNEL.

1
INTRODUCTION
Your satisfaction and safety are important to
PRECISION and a complete understanding of this
unit is necessary to attain these objectives.
As the user of this apparatus, you have the
responsibility to understand the proper function
and operational characteristics of your oven. This
instruction manual should be thoroughly read and
all operators given adequate training before
attempting to place this unit in service. Awareness
of the stated cautions and warnings, and
compliance with recommended operating
parameters -- together with maintenance
requirements -- are important for safe and
satisfactory operation. The unit should be used
for its intended application; alterations or
modifications will VOID THE WARRANTY.
CAUTION
AS A ROUTINE LABORATORY PRECAUTION,
ALWAYS WEAR SAFETY GLASSES WHEN
WORKING WITH THIS APPARATUS.
This product is not intended, nor can it be used,
as a sterile or patient connected device. In
addition, this apparatus is not designed for use in
Class I, II or III locations as defined by the National
Electrical Code.
UNPACKING AND DAMAGE
Save all packing material until unit is put into
service. This merchandise was carefully packed
and thoroughly inspected before leaving our
factory.
Responsibility for safe delivery was assumed by
the carrier upon acceptance of the shipment;
therefore, claims for loss or damage sustained in
transit must be made upon the carrier by the
recipient as follows:
1. Visible Loss or Damage: Note any external
evidence of loss or damage on the freight bill,
or express receipt, and have it signed by the
carrier's agent. Failure to adequately describe
such external evidence of loss or damage
may result in the carrier's refusing to honor
your damage claim. The form required to file
such claim will be supplied by the carrier.
2. Concealed Loss or Damage: Concealed
loss or damage means loss or damage which
does not become apparent until the
merchandise has been unpacked and
inspected. Should either occur, make a
written request for inspection by carrier's
agent within fifteen (15) days of the delivery
date; then file a claim with the carrier since
the damage is the carrier's responsibility.
If you follow the above instructions carefully, we
will guarantee our full support of your claim to be
compensated for loss or concealed damage.
DO NOT -- FOR ANY REASON -- RETURN THIS
UNIT WITHOUT FIRST OBTAINING
AUTHORIZATION. In any correspondence to
PRECISION, please supply the nameplate data,
including catalog number and serial number.

2
INSTALLATION AND ADJUSTMENT
NOTE
REFER TO THE PACKING CHECKLIST FOR THE
LIST OF ACCESSORIES SENT WITH THIS UNIT.
MAKE CERTAIN YOU HAVE ALL ACCESSORIES
BEFORE DESTROYING THE SHIPPING
CONTAINER AND PACKING MATERIAL.
Position Vacuum Oven
Place the oven on a bench or stand at a convenient
working height. Adjust the four (4) corner levelling
feet to level the oven.
CAUTION
MAINTAIN A MINIMUM OF 12 INCHES CLEARANCE
BETWEEN THE OVEN AND ANY COMBUSTIBLE
SURFACES.
Install Shelves
Two shelves are provided with the oven. Remove
the wrapped shelves from the chamber. Unwrap
the shelves and place in the chamber. The two
shelves are not adjustable up and down the
chamber. If large containers are to be placed in
the oven, place one shelf as close to the bottom of
the chamber as possible, but avoid direct contact
with chamber floor. Avoid placing items directly
on chamber floor. Place shelves in chamber with
lip up.
Install Thermometer
Hang the supplied thermometer onto the
thermometer hook located near the left front corner
of the chamber.
Connect Power Cord
CAUTION
CHECK VOLTAGE AND WATTAGE STAMPED ON THE
DATA PLATE FOR COMPATIBILITY BEFORE
CONNECTING OVEN TO A POWER SOURCE. THE
DATA PLATE CAN BE FOUND NEAR THE POWER
CORD. FIRST ENSURE THAT THE POWER SWITCH
IS IN THE "OFF" POSITION.
CAUTION
HEATERS ARE LOCATED ON BOTTOM OF
CHAMBER. PLACING AN ITEM DIRECTLY ON THE
CHAMBER FLOOR MAY CAUSE OVERHEATING OF
THE ITEM.
SPECIFICATIONS
SPECIFICATIONS
MODEL
Catalog #
5831
51220166, 51220167
Vacuum range Atmosphere to 30" Hg. with adequate pump
Temperature range 35°C to 200°C
Shelf capacity 0.55 sq. ft. (511 sq. cm) per shelf 2 shelves standard
Inside dimensions, usable
Inches
Centimeters
(W-D-H)
8 x 12 x 8
20 x 30.5 x 20
Outside dimensions
Inche s
Centimeters
(W-D-H)
13 x 16 x 18
33 x 41 x 46
Standard electrical service
Optional electrical service
500 Watts, 120 VAC
50/60 Hz, 4.2 Amps
500 Watts, 220/240 VAC
50/60 Hz, 2.1 Amps
Net weight
P ounds
Kilograms
42
19

3
EXPLANATION OF CONTROLS
NOTE
REFER TO THE PACKING CHECKLIST FOR THE
LIST OF ACCESSORIES SENT WITH THIS UNIT.
MAKE CERTAIN YOU HAVE ALL ACCESSORIES
BEFORE DESTROYING THE SHIPPING CONTAINER
AND PACKING MATERIAL.
1. Power Switch - Applies power to the oven
heater controls.
2. Temp. Control - Regulates the oven
temperature.
3. Heating Indicator - Indicates when the oven
is being heated.
4. Thermometer Hook - Provides a means of
installing a thermometer for monitoring the
chamber temperature with a glass column
thermometer.
5. Vacuum Gauge - Indicates chamber vacuum
(in inches of mercury).
6. Hose Connections - Used for connecting
minimum 1/4" vacuum tubing between oven
and vacuum pumping systems, or other
apparatus.
7. Valves - Used for evacuating chamber,
controlling vacuum, or for bleeding air and
other gasses into chamber.

4
TEMPERATURE ADJUSTMENT
Turn the power switch "ON". Turn the Temp.
Control knob fully clockwise. The "Heating"
indicator will glow when the unit is heating. When
the temperature reaches the desired operating
level (as indicated on the thermometer) turn the
Temp. Control knob counterclockwise until the
"Heating" indicator just turns off. Allow the
temperature to cycle on and off several times (3 to
4 hours) to make sure the oven has stabilized.
Adjust the Temp. Control knob up or down as
necessary.
Oven thermostats are set for operation at
temperatures over 100°C.
For control at lower temperatures, readjustment
of the thermostat may be necessary.
Two allen wrenches are required:
• 1/16" for the thermostat shaft
• 5/64" for the thermostat knob
1. Bring oven to room ambient.
2. Energize oven.
3. Set thermostat fully counter-clockwise (heat
lamp is on).
4. Remove thermostat knob. Note small allen
screw within shaft.
5. Turn shaft allen screw clockwise until lamp
goes out.
6. Attempt to control at the desired temperature.
7. It may be necessary to repeat this procedure.
NOTE
WHEN THE OVEN IS NEW AND IS FIRST HEATED,
THE INSULATION WILL BECOME SCORCHED AND
SOME SMOKE AND BURNING ODOR WILL OCCUR.
IT IS NORMAL FOR THIS CONDITION TO LAST 2
TO 3 HOURS AT HIGH HEAT.
VACUUM OPERATION
The following information serves as a guide to
operation of the vacuum system.
The total variable leak rate of the oven is 3 inches
of mercury per cubic foot per 24 hours at 29 to 26
inches of mercury.
Vacuum Sealing Agents
High vacuum silicone grease is often necessary
to provide a proper seal at tubing connections,
valve connections, door seals, etc. This is
especially important at high vacuums. However,
there are restrictions to using silicone grease,
depending upon the type of materials placed in the
oven. Refer to the maintenance section of this
manual for restrictions.
Out Gassing
The operation of the oven at high temperature while
evacuating the chamber will help drive off absorbed
gasses on the walls and other surfaces and
facilitate attainment of high vacuums.
Evacuating Chamber
Connect vacuum tubing to either hose connection
on top of vacuum oven. Turn on the vacuum pump,
then open the valve on the oven. Hold the door
closed until the vacuum begins to depress the door
seal. The vacuum gauge will indicate when the
desired pressure level is obtained. Once obtained,
close the valve, and turn off the vacuum pump. Air
may be bled into the chamber through the unused
valve to raise the pressure level.
NOTE
TO MAINTAIN AS LEAK PROOF A SYSTEM AS
POSSIBLE USE ONLY VACUUM PUMP TUBING.
MAKE SURE ALL CONNECTIONS ARE TIGHT. USE
A VACUUM PUMP SIZED TO ADEQUATELY
EVACUATE THE OVEN VOLUME.
CAUTION
VACUUM PUMPS SHOULD NEVER BE TURNED OFF
WHILE CONNECTED TO A SYSTEM UNDER
VACUUM. OIL BACK UP INTO THE LINES AND
SYSTEM WILL OCCUR NECESSITATING
EXTENSIVE CLEAN UP.

5
4. The interior finish or silicone gaskets may be
damaged by the following:
Diesel oil
JP-4 oil
MIL-0-5606
Hydraulic Fluids
Butyl Acetate
Carbon Tetrachloride
Ethylene Chloride
Gasoline
Kerosene
Xylene
Methyl Chloride
Stoddard Solvent
Toluene
Aromatic Chlorinated Solvent
5. Refer to the following chart as a guide to what
type of door gasket material is best suited for
your needs.
When turning vacuum pump off, immediately undo
the connection at the oven valve or the pump
intake.
1. Close the vacuum valve
2. Turn the pump off.
3. Immediately break the connection at the
pump or oven.
4. Leave connection open for one minute,
then reattach.
PERIODIC MAINTENANCE
1. If the oven fails to maintain set temperature,
it may indicate a problem with the Temp.
Control, or possibly a heating element failure.
Contact your local service representative.
2. Gaskets should be checked periodically for
hardening, shrinking, deterioration or other
signs of wear. It is advisable to keep several
gaskets available for use as replacements.
3. The oven is equipped with silicone door
gaskets, unless specified otherwise. Do not
use silicone door gaskets or vacuum grease
when evaporating solvents in the oven or
when using high analine point oils. BUNA-N
gaskets should be used in applications when
evaporating solvents or when using high
analine point oils.

6
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7
MAINTENANCE OF STAINLESS
STEEL
WARNING
UNIT MUST BE DISCONNECTED FROM POWER
SOURCE PRIOR TO SERVICING. IT IS
RECOMMENDED THAT ALL SERVICE BE
PERFORMED BY QUALIFIED SERVICE
PERSONNEL.
CAUTION
ELECTROLYSIS CAN DAMAGE STAINLESS STEEL.
THIS CAN OCCUR IF AN OBJECT IS ALLOWED TO
REST DIRECTLY ON THE SURFACE, TRAPPING
MOISTURE THAT BECOMES OXYGEN STARVED
BUT IS SURROUNDED BY WATER CONTAINING
OXYGEN. THE RESULTING ELECTROLYTIC
ACTION WILL PIT OR CORRODE THE STAINLESS
STEEL.
Background
Stainless steel is an alloy of steel with chromium
and nickel which increase the metal's resistance
to rust and corrosion. However, if not properly
cared for it can rust and corrode. Exposure to air
provides the passivation for clean stainless steel.
This exposure produces a thin, durable chromium-
oxide film that forms rapidly on the alloy surface
and gives stainless steel its characteristic
"stainless" quality. Exposure of the surface to water
or other oxidizing environments also produces this
passivating film. However, if free oxygen is not
available due to scale or contamination buildup the
metal surface may become vulnerable to attack.
Maintaining a neutral pH and frequent cleaning with
detergent and water will give you years of trouble
free service for your oven. The following are some
guidelines to consider.
Other Water Additives
Proper maintenance of the stainless steel chamber
will help assure many years of service.
It should be cleaned regularly with mild soapy water
and rinsed with distilled water. Always thoroughly
dry the chamber after cleaning.
IMPORTANT
IF IT IS NECESSARY TO USE THE FOLLOWING
CHEMICALS, LIMIT THE EXPOSURE TIME TO A
MAXIMUM OF FOUR HOURS. CLEAN SURFACES
IMMEDIATELY AFTER USE.
Citric Acid (Boiling) Mercury Salts
Potassium Thiocyanate Lysol
Stannous Chloride Tartaric Acid
Potassium Permanganate Dakin's Solution
Aluminum Chloride BariumChloride
Chlorinated Lime Calcium Chloride
Ferrous Chloride Phenol
Sodium Hypochlorite
NEVER USE THE FOLLOWING:
Aqua Regia Ferric Chloride
Iodine Sodium Azide
Sulfuric Acid
Cleaning
Spills of any chemical, especially those listed
above should be removed as soon as possible and
the stainless steel surface cleaned with mild soapy
water followed by copious rinse with clean water.
Do not use soap filled or metallic pads. Even
stainless steel pads are to be avoided as they may
destroy the passive film on the surface of the metal
and create crevices that may harbor contamination.
If stubborn stains persist 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 methods.
CAUTION
THE FOLLOWING CHEMICAL METHODS HAVE
PROVEN SUCCESSFUL BUT EXTREME CARE
MUST BE TAKEN WHEN HANDLING THESE
MATERIALS. ALWAYS WORK IN AN AREA WITH
ADEQUATE VENTILATION. USE THE
PRECAUTIONS OUTLINED IN THE MATERIAL
SAFETY DATA SHEET (MSDS) AND
MANUFACTURER'S INSTRUCTIONS FOR THE
PRODUCT YOU ARE WORKING WITH. FOLLOW
THE PERSONAL PROTECTION INDEX FOUND IN
THE HAZARDOUS MATERIALS IDENTIFICATION
SYSTEM (HMIS) SECTION OF THE MSDS.

8
The use and disposal of these chemicals may be
regulated by your local municipality. Consult the
regulations before disposing of these materials.
1. Bathroom tub and tile cleaners. Available at
supermarkets.
2. Any of a variety of "scale removers" available
at your local supermarket or
hardware store. Generally sold for cleaning
coffee makers, humidifiers and vaporizers.
3. Citric acid based cleaners. Contact your lab
supply dealer.
4. A 15 to 35% phosphoric acid solution.
Available form chemical supply dealers for
scale and rust removal. Allow solution to soak
the surface affected until rust and scale is
loosened. Immediately rinse with copious
amounts of clean water.
5. Oxalic Acid 2% to 5% in warm water. Swab
solution on surface allowing it to remain until
rust is loosened. Immediately flush with
copious amounts of clean water.
6. A mixture of 20% nitric acid and 1.5%
hydroflouric acid (or hydrochloric acid). Swab
solution on surface allowing it to remain until
rust is loosened. Immediately flush with
copious amounts of clean water.
The above are ranked in order of mild to strong
cleaning agents. Items 5 and 6 should only be
used if severe rust and scale stains have
developed and cannot be removed by any other
method. In any case the chemical should be
allowed to do the cleaning with minimal scrubbing.
Always follow the manufacturer's instructions.
Chamber Disinfecting
Materials known to be effective in disinfecting are:
*Household Bleach
*Glutaraldehyde
*Alcohol
Consult with your staff chemist for advice on using
these chemicals.

9
EFFECTIVE METHODS FOR CLEANING STAINLESS STEEL
Cleaning Agent * Method of Application** Effect on Finish
Routine Cleaning Soap, or ammonia, or
detergent and water.
Sponge with cloth, then rinse
with clear water and wipe dry.
Satisfactory for use on all
finishes.
Smears and Fingerprints Arcal 20, Lac-O-Nu, Lumin
Wash, O'Cedar Cream Polish,
Stainless Shine, or
Wind-O-Shine.
Rub with cloth as directed on
the package.
Satisfactory for use on all
finishes. Provides barrier film
to minimize prints.
Stubborn spots and stains,
baked-on splatter, and
other light discolorations
Allchem Concentrated
Cleaner or Lusteel.
Apply with damp sponge or
cloth.
Satisfactory for use on all
finishes.
Samae, or Cameo Copper
Cleaner.
Rub with damp cloth. Satisfactory for use on all
finishes if rubbing is light.
Cooper's Stainless Steel
Cleaner, or Revere Stainless
Steel Cleaner.
Rub with damp sponge or
cloth.
Use in direction of polish lines
on No. 4 (polished) finish. Use
light pressure on No. 2 (mill)
and Nos. 7 and 8 (polished)
finishes.
Liquid NuSteel. Rub with dry cloth. Use small
amount of cleaner.
Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished )
finishes.
Paste NuSteel, DuBois Temp,
or Aerogroom.
Rub with dry cloth using a
small amount of cleaner.
Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished)
finishes.
Household cleansers, such as
Old Dutch, Lighthouse,
Sunbrite, Wyandotte, Bab-O,
Gold Dust, Sapolio, Bon Ami,
Ajax, Comet, Off, or Stainless
Steel Super Shine.
Rub with a damp cloth. May
contain chlorine bleaches.
Rinse thoroughly after use.
Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished)
finishes.
Grade F Italian pumice, Steel
Bright, Lumin Cleaner, Zud,
Restoro, Sta-Clean, or
Highlite.
Rub with a damp cloth. Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished)
finishes.
Penny-Brite or Copper-Brite. Rub with a dry cloth using a
small amount of cleaner.
Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished)
finishes.
BuBois Stainless Steel Polish. No rubbing - just spray lightly
on dry surface and wipe off.
Forms thin, hard satin-sheen
finish that resists grease
stains, water marks,
fingerprints, etc.
MAINTENANCE OF STAINLESS STEEL (CONT.)
The following chart is provided as a guide to cleaning the interior surface of your vacuum oven.

10
EFFECTIVE METHODS FOR CLEANING STAINLESS STEEL (cont.)
Cleaning Agent * Method of Application** Effect on Finish
Heat Tint or Heavy
Discoloration
Penny-Brite or Copper-Brite. Rub with dry cloth. Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished)
finishes.
Paste NuSteel, DuBois Temp,
Tarnite, or Kelox.
Rub with dry cloth or stainless
steel wool.
Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished)
finishes.
Revere Stainless Steel
Cleaner, Take-Off, or AC-60
Apply with damp sponge or
cloth.
Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished)
finishes.
Allen Polish, Steel Bright,
Wyandotte, Bab-O, Zud,
Dubrite, or Prepare Dex.
Rub with a damp cloth. Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished)
finishes.
Burnt-on Foods and
Grease, Fatty Acids,
Milkstone (where swabbing
or rubbing is not practical)
Easy-Off, De-Grease-It, 4 to
6% hot solution of such
agents as trisodium
phosphate, or sodium
tripolyphosphate, or 5 to 15%
caustic soda solution.
Apply generous coating. Allow
to stand for 10-15 minutes.
Rinse. repeated application
may be necessary.
Excellent removal, satisfactory
for use on all finishes.
Tenacious Deposits, Rusty
Discolorations, Industrial
Atmospheric Stains
Oakite No. 33, Dilac, Texo 12,
Texo N.Y., Flash-Klenz,
Caddy Cleaner, Turco Scale
4368 or Permag 57.
Rub with dry cloth. Use small
amount of cleaner.
Use in direction of polish lines
on No. 4 (polished) finish.
May scratch No. 2 (mill) and
Nos. 7 and 8 (polished )
finishes.
Hard Water Spots and
Scale
Vinegar. Swab or wipe with cloth.
Rinse with water and dry.
Satisfactory for all finishes.
5% oxalic acid, 5% sulfamic
acid, 5 to 10% phosphoric
acid, or Dilac, Oakite No. 33,
Texo 12, Texo N.Y
Swab or soak with cloth. Let
stand 10-15 minutes. Always
follow with neutralizer rinse,
and dry.
Satisfactory for all finishes.
Effective on tenacious
deposits or where scale has
built up.
Grease and Oil Organic solvents such as
carbon tetrachloride,
trichlorethylene, acetone,
kerosene, gasoline, benzene,
alcohol, and chlorethane n.u.
Rub with cloth. Organic
solvents may be flammable
and/or toxic. OBSERVE ALL
PRECAUTIONS AGAINST
FIRE. Do not smoke while
vapors are present, and BE
SURE AREA IS WELL
VENTILATED.
Satisfactory for use on all
finishes.
SUGGESTIONS:
- Use the mildest cleaning procedure that will do the job
effectively.
- Rub in the direction of polish lines for maximum effectiveness
and to avoid marring the surface.
- Rinse thoroughly with fresh water after every cleaning
operation.
- Wipe dry to avoid water markes.
NOTE:
* Use of proprietary names is intended only to indicate a type
of cleaner, and does not constitute an endorsement, nor is
omission of any proprietary cleaner to imply its inadequacy. It
should be emphasized that all products should be used in
strict accordance with instructions on package.
** In all applications a stainless steel wool or sponge or
fibrous brush or pads are recommended. Avoid use of
ordinary steel wool or steel brushes for scouring stainless
steel.

11
REPLACEMENT PARTS LIST
REPLACEMENT PARTS LIST
Model 5831 Vacuum Oven
Part No. Description
34240618 Power Switch (120/240 Volt)
51245363 Thermostat Kit (120V)
51245364 Thermostat Kit (240V)
34239194 Thermal Cut-Out
34307089 Thermometer
51245329 Vacuum Valve Kit
51245350 Vacuum Gauge Kit
51245090 Heaer Kit
34003046 Shelf
34167331 Door Gasket, Silicone
34002419 Door Gasket , Buna-N
34167342 Door Gasket , Viton
51245187 Door Assembly (Tan)
51245351 Hinge Kit
51245375 Rubber Feet Kit
51245328 Latch Kit
51245367 Power Cord Kit (120V)
51245368 Power Cord Kit (240V)
WHEN ORDERING REPLACEMENT PARTS, PLEASE
SPECIFY THE MODEL NUMBER, SERIAL NUMBER
OF YOUR UNIT, AND DATE PURCHASED. THE
MODEL AND SERIAL NUMBERS CAN BE FOUND ON
THE NAMEPLATE WHICH IS LOCATED NEAR THE
SERVICE CORD.

12
WIRING DIAGRAMS
120 VOLT WIRING DIAGRAM

13
220 VOLT WIRING DIAGRAM

14
WARRANTY
NAPCO warrants its products against defects in material or in workmanship when used under appropriate
conditions and in accordance with appropriate operating instructions for a period of no less than one
(1) year from the date of delivery of the products.
The sole obligation of NAPCO shall be to repair or replace at our option, FOB factory or locally, without
charge, any part(s) that prove defective within the warranty period, provided that the customer notifies
NAPCO promptly and in writing of any such defect. Compensation for labor by other than NAPCO
employees will not be our obligation. Part(s) replacement does not constitute an extension of the
original warranty period.
NAPCO makes no warranty of merchantability, fitness for a particular purpose, or any other warranty,
express or implied, as to the design, sale, installation, or use of its products, and shall not be liable for
consequential damages resulting from the use of its products.
NAPCO will not assume responsibility for unauthorized repairs or failure as a result of unauthorized
repairs, replacement, or modifications made negligently or otherwise improperly made or performed
by persons other than NAPCO employees or authorized representatives.
While our personnel are available to advise customers concerning general application of all manufactured
products, oral representations are not warranties with respect to particular application and should not
be relied upon if inconsistent with product specification or the terms stated herein.
In any event, the terms and conditions continued in NAPCO, formal sales contracts shall be controlling;
and any changes must be in writing and signed by an authorized executive of NAPCO.
All defective components will be replaced without charge for one (1) year from the date of delivery.
There will be no charge for labor if the apparatus is returned to the factory prepaid.
Conditions and qualifications of the warranty statement shall prevail at all times.