shelolab SMO14-2 User manual

Installation - Operation Manual
SMO14-2 SMO28-2 SMO28G-2
SMO FORCED AIR OVENS 230 Voltage

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These ovens require permanent connect wiring (also known as a hardwiring) to a power source
Pictured on Cover: Left to right SMO14-2 and SMO28-2

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SMO Forced Air Ovens 230 Voltage
Part Number (Manual): 4861581
Revision: January 30, 2018
Note: The SMO28G-2 ships with two wire shelves typically used in curing applications. The
SMO28G-2 is identical to the SMO28-2 in all other respects.
SHEL LAB is a brand of Sheldon Manufacturing, INC.
Safety Certifications
These units are CUE listed by TÜV SÜD as forced air ovens for professional, industrial, or
educational use where the preparation or testing of materials is done at an ambient air pressure
range of 22.14 – 31.3 inHg (75 – 106 kPa) and no flammable, volatile, or combustible materials are
being heated.
These units have been tested to the following requirements:
CAN/CSA C22.2 No. 61010-1:2012
CAN/CSA C22.2 No. 61010-2-010 + R:2009
UL 61010A-2-010:2002
UL 61010-1:2012
EN 61010-1:2010
EN 61010-2-010:2003

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TABLE OF CONTENTS
INTRODUCTION ........................................................................................................................................................ 5
Read this Manual....................................................................................................................................................................5
Safety Considerations and Requirements ......................................................................................................................5
Contacting Assistance ..........................................................................................................................................................6
Temperature Reference Sensor Device ..........................................................................................................................6
Engineering Improvements..................................................................................................................................................6
RECEIVING YOUR UNIT ............................................................................................................................................7
Inspect the Shipment............................................................................................................................................................. 7
Orientation................................................................................................................................................................................8
Recording Data Plate Information.................................................................................................................................... 11
INSTALLATION .........................................................................................................................................................13
Hardwire Requirement........................................................................................................................................................ 13
Installation Checklist ........................................................................................................................................................... 13
Required Ambient Conditions........................................................................................................................................... 14
Required Clearances........................................................................................................................................................... 14
Environmental Disruption Sources .................................................................................................................................. 14
Power Source Requirements ............................................................................................................................................ 15
Power Feed Wiring............................................................................................................................................................... 15
Lifting and Handling ............................................................................................................................................................ 16
Leveling................................................................................................................................................................................... 16
Install the Oven ......................................................................................................................................................................17
Installation Cleaning.............................................................................................................................................................17
Install the Shelving................................................................................................................................................................17
GRAPHIC SYMBOLS ................................................................................................................................................19
CONTROL PANEL OVERVIEW ...............................................................................................................................21
OPERATION.............................................................................................................................................................. 23
Operating Precautions....................................................................................................................................................... 23
Theory of Operation ........................................................................................................................................................... 24
Put the Oven into Operation ............................................................................................................................................ 26
Set the Temperature Set Point.........................................................................................................................................27
Set the Over Temperature Limit...................................................................................................................................... 28
Setting the Timer ................................................................................................................................................................. 29
Launch a Heating Profile.................................................................................................................................................... 31
Drying Racks and other Accessories............................................................................................................................. 32
USER MAINTENANCE............................................................................................................................................. 33
Cleaning and Disinfecting................................................................................................................................................. 33
Door Components............................................................................................................................................................... 34
Electrical Components....................................................................................................................................................... 34
Calibrating the Temperature Display ............................................................................................................................ 35
UNIT SPECIFICATIONS .......................................................................................................................................... 39
Weight..................................................................................................................................................................................... 39
Dimensions............................................................................................................................................................................ 39
Capacity ................................................................................................................................................................................. 39
Shelf Capacity by Weight.................................................................................................................................................. 40
Air Flow Performance......................................................................................................................................................... 40
Temperature .......................................................................................................................................................................... 41
Power....................................................................................................................................................................................... 41
PARTS LIST............................................................................................................................................................... 43

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INTRODUCTION
Thank you for purchasing a SHEL LAB oven. We know you have many choices in today’s competitive
marketplace when it comes to constant temperature equipment. We appreciate you choosing ours. We
stand behind our products and will be here if you need us.
READ THIS MANUAL
Failure to follow the guidelines and instructions in this user manual may create a protection
impairment by disabling or interfering with the unit safety features. This can result in injury or death.
Before using the unit, read the manual in its entirety to understand how to install, operate, and
maintain the unit in a safe manner. Keep this manual available for use by all operators. Ensure all
operators are given appropriate training before the unit begins service.
SAFETY CONSIDERATIONS AND REQUIREMENTS
Follow basic safety precautions, including all national laws, regulations, and local ordinances in your
area regarding the use of this unit. If you have any questions about local requirements, please
contact the appropriate agencies.
SOPs
Because of the range of potential applications this unit can be used for, the operator or their
supervisors must draw up a site-specific standard operating procedure (SOP) covering each
application and associated safety guidelines. This SOP must be written and available to all operators
in a language they understand.
Locations and Intended Applications Range
SMO forced-air ovens are engineered for constant temperature forced-air drying, curing, and baking
applications in professional, industrial, and educational environments. The ovens are not intended
for use at hazardous or household locations.
Power
Your unit and its recommended accessories are designed and tested to meet strict safety
requirements.
•Always hardwire the unit power feed to a protective earth-grounded electrical source that
conforms to national and local electrical codes. If the unit is not grounded, parts such as
knobs and controls may conduct electricity and cause serious injury.
•Position the unit so the end-user can quickly and easily disconnect or uncouple the power
feed in the event of an emergency.
•Avoid damaging the power feed. Do not bend it excessively, step on it, place heavy objects
on it. A damaged power feed can easily become a shock or fire hazard. Never use a power
feed after it has been damaged.
•Use only approved accessories. Do not modify system components. Any alterations or
modifications to your oven may be dangerous and will void your warranty.

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INTRODUCTION
CONTACTING ASSISTANCE
Phone hours for Sheldon Technical Support are 6 am – 4:30 pm Pacific Coast Time (west coast of
the United States, UTC -8). Please have the following information ready when calling or emailing
Technical Support: the model number and the serial number (see page 11).
EMAIL: [email protected]
PHONE: [phone] extension 4, or [phone]
FAX: [phone]
Sheldon Manufacturing, INC.
P.O. Box 627
Cornelius, OR 97113
TEMPERATURE REFERENCE SENSOR DEVICE
The oven does not come with a temperature reference device. A reference
device must be purchased separately for performing in-house accuracy
validations or calibration adjustments of the oven temperature display.
The device must be accurate to at least 0.1°C and should be regularly
calibrated by a third party. For best results, use a digital device with one or
more thermocouple probes. Remote readings eliminate chamber door openings and avoid
subsequent waits for the chamber temperature to re-stabilize. Select probes suitable for the
application temperature you will validate or correct the display accuracy at.
Alcohol thermometers are insufficient for conducting accurate validations and calibrations. Do not
use a mercury thermometer. Never place a mercury thermometer in the oven chamber. Always use
thermocouple probes.
ENGINEERING IMPROVEMENTS
Sheldon Manufacturing continually improves all of its products. As a result, engineering changes and
improvements are made from time to time. Therefore, some changes, modifications, and
improvements may not be covered in this manual. If your unit’s operating characteristics or
appearance differs from those described in this manual, please contact your SHEL LAB dealer or
customer service representative for assistance.

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RECEIVING YOUR UNIT
INSPECT THE SHIPMENT
•When a unit leaves the factory, safe delivery becomes the responsibility of the carrier.
•Damage sustained during transit is not covered by the manufacturing defect warranty.
•Save the shipping carton until you are certain that the unit and its accessories function
properly
When you receive your unit, inspect it for concealed loss or damage to its interior and exterior. If you
find any damage to the unit, follow the carrier’s procedure for claiming damage or loss.
1. Carefully inspect the shipping carton for damage.
2. Report any damage to the carrier service that delivered the unit.
3. If the carton is not damaged, open the carton and remove the contents.
4. The unit should come with an Installation and Operation Manual.
5. Verify that the correct number of accessory items have been included.
Included Components:
Model Shelves Shelf Clips Leveling Feet
SMO14-2 3 12 4
SMO28-2
6
24
4
Model Shelves Shelf Clips Leveling Feet
SMO28G-2
2
8
4
6. Carefully check all packaging for accessories before discarding.

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Figure
1: SMO28-2
RECEIVING YOUR UNIT
ORIENTATION
Power Panel (Back)
Permanent Connect Wire Braid
10 gauge, 6 inches (15 cm)
Control Panel
Vent Port with Sliding Dampener
Vent Port with Sliding Dampener
Main Temperature
and OTL Sensor
Door Latch
Door Latch
Shelf Standard Rail
Oven Chamber
Chamber Door
Handle
Chamber Liner Gasket
Door Liner
Gasket

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Figure
2: SMO28G-2
RECEIVING YOUR UNIT
Power Panel (Back)
Permanent Connect Wire Braid
10 gauge, 6 inches (15 cm)
Control Panel
Vent Port with Sliding Dampener
Vent port with Sliding Dampener
Main Temperature and
OTL Sensor Probes
Door Latch
Shelf Standard Rail
Oven Chamber
Chamber Door
Handle
Chamber
Liner
Door Liner
Gasket

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Figure
3: SMO14-2
RECEIVING YOUR UNIT
Control Panel
Main Temperature and
OTL Sensor Probes
Shelf Standard Rail
Chamber Door
Handle
Vent Port with Sliding Dampener
Vent Port with Sliding Dampener
Oven Chamber
Power Panel (Back)
Permanent Connect
Wire Braid 14 gauge, 6
inches (15 cm)
Door Liner
Gasket
Chamber Liner Gasket

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RECEIVING YOUR UNIT
RECORDING DATA PLATE INFORMATION
Locate the data plate on the back of the oven below the power braid inlet. The data plate contains
the oven model number and serial number. Technical support and your distributor will need these
numbers in order to assist you in the future.
Date Plate Information
Model Number
Serial Number

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RECEIVING YOUR UNIT

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INSTALLATION
HARDWIRE REQUIREMENT
The oven requires permanent connect wiring (commonly known as hardwiring). Wiring to the power
source must be performed by a qualified electrical technician. All other Installation steps may be
performed by the end user.
INSTALLATION CHECKLIST
Carry out the procedures and steps listed below to install the oven in a new workspace location and
prepare it for use. All procedures are found in the Installation section of this manual.
Pre-Installation
Check that the required ambient condition for the oven are met, page 14
Check that the spacing clearance requirements are met, page 14
•Unit dimensions may be found on page 39
Check for performance-disrupting heat and cold sources in the environment, page 14
Check that a suitable permanent connect electrical power supply is present, page 15
Install the Oven in its Workspace Location
Review the lifting and handling instructions, page 16
Make sure the oven is level, page 16
Install the oven in its workspace location, page 17
Set up the Oven for Use
Clean the oven chamber and shelving if needed, page 17
Install the shelving in the oven chamber, page 17

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INSTALLATION
REQUIRED AMBIENT CONDITIONS
This oven is intended for use indoors, at room temperatures between 15°C and 40°C (59°F and
104°F), at no greater than 80% Relative Humidity (at 25°C / 77°F).
Operating the unit outside of these conditions may adversely affect its temperature range and
stability. For conditions outside of those listed above, please contact your distributor to explore
other oven options suited to your laboratory or production environment.
REQUIRED CLEARANCES
These clearances are required for the oven to operate safely and meet its stated temperature
specifications
•24 inches (610 mm) of vertical headspace clearance.
•Do not place objects on top of the oven.
•Allow at least 6 inches (152 mm) from the access port and fan vent on the back of the oven
to the nearest wall or partition. Keep the fan unobstructed at all times.
ENVIRONMENTAL DISRUPTION SOURCES
When selecting a location to install the unit, consider all environmental conditions that can affect its
temperature performance. For example:
•Proximity to other ovens, autoclaves, and any device that produces significant radiant heat
•Heating and cooling ducts, or other sources of fast-moving air currents
•High-traffic areas
•Direct sunlight
6” (152mm)
6” (152mm)
12” (305mm)
24” (610mm)
24” (610mm)
Door Swing
37.9” (962mm)
All Units

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INSTALLATION
POWER SOURCE REQUIREMENTS
When selecting a location for the oven, check that each of the following requirements is satisfied:
Power supply: The power supply must meet the power requirements listed on the oven data plate
(located on the back of the unit, beneath the power feed inlet.
•These ovens are intended for a 230 volt, 50/60 Hz applications at the following amperages:
Model Amperage Model Amperage
SMO14-2 12 SMO28-2 20
•The power source must be single (1) phase and protective earth grounded.
•The power source must conform to all national and local electrical codes.
•Supplied voltage must not vary more than 10% from the data plate rating. Damage to the oven
may result if the supplied voltage varies more than 10%.
•Use a separate circuit to prevent loss of the unit due to overloading or circuit failure. The circuit
must meet or exceed the amperage requirements listed on the oven data plate.
Switch or circuit-breaker: A switch or circuit-breaker must be used in the building installation to protect
against overcurrent conditions.
•The required circuit-breakers are, SMO14-2 15A and SMO28-2 SMO28G-2 30A.
Power feed disconnect: The oven must be positioned so that all operators have access to the power feed
disconnect in case of emergencies.
•The Disconnect must be in close proximity to the equipment and within easy reach of the
operator.
•The Disconnect must be marked as the disconnecting device for the equipment.
POWER FEED WIRING
The oven comes provided with an integral 6 inch (15 cm) wire braid of:
•SMO14-2 – Two 14-gauge high-temperature (300°C) hot wires and a 14-gauge earth ground.
•SMO28-2 SMO28G-2 -- Two 10-gauge high-temperature (300°C) hot wires and a 10-gauge
earth ground.
The wires for power source connection should be in accordance with the following:
•SMO14-2: Green/Yellow – Earth; Red – Hot; Black – Hot.
•SMO28-2 SMO28G-2: Green/Yellow – Earth; Black – Hot; Black – Hot.
The oven must be grounded using the protective conductor terminal (green with yellow stripe wire). Do
not remove the protective conductor (earth connection). Removing the protective conductor will negate the
oven protections against potentially dangerous electric shocks and create a possible fire hazard.

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INSTALLATION
LIFTING AND HANDLING
The oven is heavy. Use appropriate lifting devices that are sufficiently rated for these loads. Follow these
guidelines when lifting the oven:
•Lift the oven only from its bottom surface.
•Doors, handles, and knobs are not adequate for lifting or stabilization.
•Restrain the oven completely while lifting or transporting so it cannot tip.
•Remove all moving parts, such as shelves and trays, and lock doors in the closed position
during transfers to prevent shifting and damage.
LEVELING
Install the 4 leveling feet with the 4 corner holes on the bottom of the oven.
The oven must be level and stable for safe operation.
Note: To prevent damage when moving the unit, turn all four leveling feet so that the leg of each
foot sits inside the unit.

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INSTALLATION
INSTALL THE OVEN
Place the unit in a workspace location that meets the criteria discussed in the previous entries of the
Installation section.
•Verify that the oven stands level and does not rock. Adjust the leveling feet as needed.
•Power: The oven may now be hardwired to its power source
INSTALLATION CLEANING
The unit was cleaned at the factory, but not sterilized. It may have been exposed to contaminants en route
during shipping.
•Remove all wrappings and coverings from shelving prior to cleaning and installation.
•Do not clean with deionized water.
•See the Cleaning and Disinfecting topic in the User Maintenance section (see page 33) for
more information on how to clean the oven chamber prior to putting the unit into operation.
INSTALL THE SHELVING
Space the shelves evenly in the oven chamber to ensure the best possible air circulation and temperature
uniformity.
1. Install 4 shelf clips in 4 slots on the shelf standard rails on the left and right walls and the rear
wall of the chamber interior.
a. Squeeze each clip.
b. Insert the top tab first, then the bottom tab using a rocking motion.
c. The slots must all be at equal height from the oven chamber floor.
2. Set the shelf on the clips.
Figure
5: Installing Shelf Clip
Figure
4: Shelf Set on Clips
Rocking Motion

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INSTALLATION

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GRAPHIC SYMBOLS
The oven is provided with multiple graphic symbols on its exterior. The symbols identify hazards and
the functions of the adjustable components, as well as important notes in the user manual.
Symbol Definition
Consult the user manual.
Consulter le manuel d'utilisation
Indicates Temperature
Repère température
Indicates the Over Temperature Limit system
Indique le système de dépassement de temperature
AC Power
Repère le courant alternatif
I/ON O/OFF
I indique que l'interrupteur est en position marche.
O indique que le commutateur est en position d'arrêt.
Protective earth ground
Terre électrique
Indicates UP and DOWN respectively
Touches d e déplacements respectifs vers le HAUT et le BA
Indicates a Manually Adjustable control
Indique un bouton réglable manuellement
Potential shock hazard
Risque de choc électrique
Recycle the unit. Do not dispose of in a landfill.
Recycler l'unité. Ne jetez pas dans une décharge.

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GRAPHIC SYMBOLS
Symbol Definition
Indicates the timer
Indique le minuterie
Start or Stop the Timer
Lancer ou arrêter le minuteur
Reset the Timer
Réinitialisation de la Minuterie
Caution hot surface
Attention surface chaude