Shel lab SMO38HP-2 User manual

Installation – Operation Manual
SMO38HP-2 SMO14HP-2
HIGH-PERFORMANCE OVENS
220 – 240 Voltage

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These ovens require permanent connect wiring (also known as hardwiring) to a single-phase power
supply.
Pictured on front cover: SMO38HP-2 (left) and SMO14HP-2 (right)

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SMO High-Performance Ovens 220 – 240 Voltage
Part number (Manual): 4861705
Revision: December 12, 2018
SHEL LAB is a brand of Sheldon Manufacturing, INC, an ISO 9001
certified manufacturer.
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.
The units have been tested to the following requirements:
CAN/CSA-22.2 No. 61010-1:2012
CAN/CSA-C22.2 No. 61010-2-010:2015
UL 61010-1:2012
UL 61010-2-010:2015
EN 61010-1:2010
EN 61010-2-010:2014

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TABLE OF CONTENTS
INTRODUCTION........................................................................................................................................... 5
Read this Manual ...................................................................................................................................... 5
Safety Considerations and Requirements ................................................................................................ 5
Contacting Assistance............................................................................................................................... 6
Manufacturing Warranty ............................................................................................................................ 6
Engineering Improvements ....................................................................................................................... 6
Reference Sensor Device ......................................................................................................................... 7
RECEIVING YOUR OVEN ............................................................................................................................ 9
Inspect the Shipment ................................................................................................................................ 9
Orientation Images .................................................................................................................................. 10
Recording Data Plate Information ........................................................................................................... 12
INSTALLATION .......................................................................................................................................... 13
Hardwire Requirement ............................................................................................................................ 13
Installation Checklist ............................................................................................................................... 13
Required Ambient Conditions ................................................................................................................. 14
Required Clearances .............................................................................................................................. 14
Power Source Requirements .................................................................................................................. 15
Power Feed Wiring.................................................................................................................................. 16
Lifting and Handling ................................................................................................................................ 16
Removing from the Pallet ........................................................................................................................ 16
Leveling ................................................................................................................................................... 17
Install the Oven ....................................................................................................................................... 17
Installation Cleaning ................................................................................................................................ 17
Install the Shelving .................................................................................................................................. 18
GRAPHIC SYMBOLS................................................................................................................................. 19
CONTROL OVERVIEW .............................................................................................................................. 21
OPERATION ............................................................................................................................................... 23
Operating Precautions ............................................................................................................................ 23
Theory of Operations .............................................................................................................................. 24
Put the Oven into Operation.................................................................................................................... 26
Set the Over Temperature Limit.............................................................................................................. 27
Over Temperature Limit Activation.......................................................................................................... 28
Set the Constant Temperature Set Point ................................................................................................ 29
Heating Profiles ....................................................................................................................................... 29
Venting the Exhaust Port ........................................................................................................................ 30
Power Exhaust Blower ............................................................................................................................ 31
USER MAINTENANCE............................................................................................................................... 33
Cleaning and Disinfecting ....................................................................................................................... 33
Door Gaskets and Chamber Integrity...................................................................................................... 34
Electrical Components ............................................................................................................................ 34
Calibrating the Temperature Display....................................................................................................... 35
UNIT SPECIFICATIONS............................................................................................................................. 41
Weight ..................................................................................................................................................... 41
Dimensions.............................................................................................................................................. 41
Capacity .................................................................................................................................................. 41
Shelf Capacity by Weight ........................................................................................................................ 42
Maximum Number of Shelves ................................................................................................................. 42
Air Flow Performance.............................................................................................................................. 42
Temperature Performance ...................................................................................................................... 43
Power ...................................................................................................................................................... 44
PARTS LIST ............................................................................................................................................... 45

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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.
Locations and Intended Applications Range
SMOHP 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.
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.
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.
•Do not bend the power feed excessively, step on it, or place heavy objects on it.
•A damaged power feed can be a shock or fire hazard. Never use a power feed if it is
damaged or altered in any way.
•Use only approved accessories. Do not modify system components. Any alterations or
modifications to your unit not explicitly authorized by the manufacturer can 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) Monday - Friday. Please have the following information ready when calling
or emailing Technical Support: the model number and the serial number (see page 10).
[e-mail]
1-800-322-4897 extension 4
[phone] extension 4
FAX: [phone]
Sheldon Manufacturing, INC.
P.O. Box 627
Cornelius, OR 97113
USA
MANUFACTURING WARRANTY
For information on your warranty and online warranty registration please visit:
sheldonmanufacturing.com/warranty
ENGINEERING IMPROVEMENTS
Sheldon Manufacturing, Inc. 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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INTRODUCTION
REFERENCE SENSOR DEVICE
Must be purchased separately
A reference sensor device is required for calibrating the oven temperature display.
Reference devices must meet the following standards:
•Accurate to at least 0.1°C
The device should be regularly calibrated, preferably by a third party.
Temperature Probes
Use a digital device with a wire thermocouple probe that can be introduced into the unit chamber
through the door space. Select a thermocouple suitable for the application temperature you will be
calibrating at.
Why a Probe?
Reference readings taken outside the chamber using wire temperature probes avoid chamber door
openings. Openings disrupt the chamber temperature. Each disruption requires a minimum 1-hour wait
to allow the atmosphere to re-stabilize before continuing.
No Alcohol or Mercury Thermometers
Alcohol thermometers do not have sufficient accuracy to conduct accurate temperature calibrations.
Never place a mercury thermometer in the unit chamber. Always use thermocouple probes.
Temperature
Reference

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INTRODUCTION

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RECEIVING YOUR OVEN
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 accessories has been included. Carefully check all
packaging for accessories before discarding
Included accessories
Model Shelves Shelf Slides / Clips Leveling Feet
SMO14HP-2 6 24 Clips 4
SMO38HP-2 12 48 Clips 4
Shelf Types
SMO14HP-2 SMO38HP-2

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RECEIVING
ORIENTATION IMAGES
Temperature Sensor Probes
Control Panel
Exhaust Vent
Intake Vent
Chamber Gasket
Shelf Standard
Mounting Rail
SMO38HP-2
Note: The oven has one oven chamber.

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SMO14HP
-2
RECEIVING
Intake Vent
Exhaust Vent
Control Panel
Chamber Gasket
Temperature Sensor Probes
Shelf Standard Mounting Rail
Note: The oven has one oven chamber.

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RECEIVING
Oven Vents
Power Panel (back of the oven)
RECORDING DATA PLATE INFORMATION
The data plate contains the unit model number, serial number, and part number. Tech Support needs
this information to provide accurate help during support calls and emails.
•The data plate is located on the back of the oven, next to the power inlet.
MODEL NO:
SERIAL NO:
PART NO:
Permanent Connect Wire Braid 10 gauge, 6 inches (150 mm)
Exhaust
Intake
Power outlet for an accessory exhaust blower
fan, NEMA 6-20R

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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 can be
performed by the end-user.
INSTALLATION CHECKLIST
For installing the unit in a new workspace location.
Pre-Installation
Pre-Installation
Check that the required ambient conditions for the unit are met, page 14.
Check that the spacing clearance requirements are met, page 14.
•Unit dimensions may be found on page 40.
Check that a suitable permanent connect electrical power supply is present, page 15.
Install the oven in a suitable workspace location
Review the lifting and handling instructions, page 16.
Install the unit leveling feet, page 17.
Install the oven in its workspace location, page 17.
•The oven may be connected to its power supply after this procedure.
Set up the oven for use
Recommended: Clean the unit and shelving (recommended), page 17.
Install the shelving, page 18.

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12” (305 mm)
INSTALLATION
REQUIRED AMBIENT CONDITIONS
These units are 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 outside these conditions may
adversely affect the unit temperature performance.
When selecting a location to install the unit, consider all environmental conditions that can affect its
temperature performance. These include:
•Proximity to other ovens, autoclaves, and any device producing significant radiant heat
•Heating and cooling vents or other sources of fast-moving air currents
•High-traffic areas
•Direct sunlight
REQUIRED CLEARANCES
These clearances are required to provide air flows for ventilation and cooling.
6 inches (152 mm) of clearance is required on the sides of the unit.
12 inches (305 mm) of clearance is required on the back of the unit.
24 inches (620 mm) of headspace clearance is required between the exhaust vent and any
overhead cover or partition.
•12 inches (305 mm) of headspace clearance will suffice if the oven exhaust is vented from
the workspace through a duct or other channeling.
Do not place objects on top of the oven. Exception: A power exhaust blower may be mounted on the
top exhaust vent.
The chamber access port is located on the back of the oven. Leave sufficient clearance for end-
users to safely access this port.
Venting duct attached
24” (610 mm)
12” (305 mm)
6” (152 mm)
Door Swing
SMO14HP-2: 22” (559 mm)
SMO38HP-2: 34” (864 mm)
6” (152 mm)
Hot exhaust!
6” (152 mm)
6” (152 mm)

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INSTALLATION
POWER SOURCE REQUIREMENTS
When selecting a location for the oven, check that each of the following requirements are satisfied:
Power Supply: The 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 220 – 240 volt, 50/60 Hz applications at the following
amperages:
Model Amperage Model Amperage
SMO14HP-2 26.0 SMO38HP-2 50.0
•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 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: SMO14HP-2 30 amps; SMO38HP-2 60 amps
Power Feed Disconnect: The oven must be positioned so all end-users 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
end-user.
•The disconnect must be marked as the disconnecting device for the equipment.
The unit comes equipped with internal fuses. Replacing these fuses is a service-level procedure and
should be performed by a qualified electrical technician.

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INSTALLATION
POWER FEED WIRING
The oven comes provided with an integral 6-inch (150 mm) wire braid of:
•SMO14HP-2 – two 10-gauge hot wires and a 10-gauge earth ground.
•SMO38HP-2 – two 6-gauge hot wires and a 6-gauge earth ground.
The wires for power source connection should be in accordance with the following for all units:
Green/Yellow – Earth; Black – Hot; Black – Hot.
The oven must be earth 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.
LIFTING AND HANDLING
The unit is heavy. Use appropriate lifting devices that are sufficiently rated for these loads. Follow these
guidelines when lifting the unit.
•Lift the unit only from its bottom surface.
•Doors, handles, and knobs are not adequate for lifting or stabilization.
•Restrain the unit 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.
REMOVING FROM THE PALLET
The unit comes secured to a shipping pallet with hex bolts inserted through the 4 leveling feet holes
on the bottom of the oven. Use a socket wrench to remove the bolts and release the unit from the
pallet.
0.5 inch (12 mm)

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INSTALLATION
LEVELING
Install the 4 leveling feet in the 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 4 leveling feet so that the leg of each foot
sits inside the unit.
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.
•A qualified technician may now connect the oven to its power source.
INSTALLATION CLEANING
The manufacturer recommends cleaning the shelving and oven chamber prior to installation of the
shelving in the chamber. The unit was cleaned at the factory but may have been exposed to
contaminants during shipping.
•Remove all wrappings and coverings from shelving prior to cleaning and installation.
•See the Cleaning and Disinfecting topic in the User Maintenance chapter (page 33) for
more information on how to clean the oven chamber and shelving.
•Do not clean with deionized water.

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INSTALLATION
INSTALL THE SHELVING
Airflow: The horizontal airflow in the chamber moves from the small duct holes in the chamber right
wall, across the shelf space, and into the large holes in the left wall. To maximize air flow, avoid
obstructing the duct holes on either side as much as possible when placing shelves.
Spacing: Space the shelves evenly in the oven chamber to ensure the best possible temperature
uniformity.
1. Install 4 shelf clips in 4 slots on the shelf standard rails. These mounting rails are located on
the left, right, and rear walls 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 to hold the shelf level.
2. Place the shelf on the clips.
Installing a Shelf Clip Shelf Set on Clips
Rocking Motion

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GRAPHIC SYMBOLS
The unit is provided with graphic symbols on its exterior. These identify hazards and adjustable
components as well as important notes in the user manual.
Symbol Definition
Consult the user manual
Consulter le manuel d'utilisation
Indicates adjustable temperature
Indique température réglable
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
Potential shock hazard
Risque de choc électrique
Caution hot surface
Attention surface chaude
Recycle the unit. Do not dispose of in a landfill.
Recycler l'unité. Ne jetez pas dans une décharge.

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SYMBOLS