Shel Lab SMO5CR-2 User Manual

Installation and

Operation Manual

SMO5CR-2

Previously designated as

CR1-2

Clean Room Oven 220 – 240 Voltage

SHEL LAB Clean Room Oven 220 - 240 Voltage

Installation and Operation Manual
Part Number (Manual): 4861580
Revision: November 5, 2015

This oven requires permanent connect wiring (also known as hardwiring. It does not connect to a
wall power source using a plug-in power cord.

These units are TÜV listed as high performance 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), with no flammable, volatile, or combustible materials being heated.

These units have been tested to the following requirements:
CAN/CSA C22.2 No. 61010-1:2012

CAN/CSA C22.2 No. 61010-2-010:2004 Reaffirmed: 2014-07
UL 61010-1:2012-05
UL 61010A-2-010:2002-03
EN 61010-1:2010
EN 61010-2-010:2014
Supplemented by: UL 61010-2-010:2015

2 | P a g e

This page left blank

3 | P a g e

TABLE OF CONTENTS

INTRODUCTION ........................................................................................................................................... 6

General Safety Considerations ................................................................................................................. 6

Engineering Improvements ....................................................................................................................... 7

Contacting Assistance ............................................................................................................................... 7

Temperature Reference Sensor Device ................................................................................................... 7

RECEIVING YOUR OVEN ............................................................................................................................ 8

Inspecting the Shipment ............................................................................................................................ 8

Recording Data Plate Information ............................................................................................................. 8

Orientation ................................................................................................................................................. 9

INSTALLATION .......................................................................................................................................... 10

Ambient Conditions ................................................................................................................................. 10

Selecting a Location ................................................................................................................................ 10

Power Source Requirements .................................................................................................................. 11

Power Feed Wiring .................................................................................................................................. 11

Lifting and Handling ................................................................................................................................ 12

Leveling ................................................................................................................................................... 12

Install the Oven ....................................................................................................................................... 12

Initial Cleaning ......................................................................................................................................... 12

Shelving Installation ................................................................................................................................ 13

GRAPHIC SYMBOLS ................................................................................................................................. 14

CONTROL PANEL OVERVIEW ................................................................................................................. 16

OPERATION ............................................................................................................................................... 18

Operating Precautions ............................................................................................................................ 18

Theory of Operations .............................................................................................................................. 20

Preparing the Oven for Use .................................................................................................................... 22

Set the Over Temperature Limit .............................................................................................................. 23

Set the Temperature Controller Set Point ............................................................................................... 23

HEPA Filter Burn-In ................................................................................................................................. 24

Temperature Accuracy Verification ......................................................................................................... 26

Closed Vents ........................................................................................................................................... 28

Over Temperature Limit Active ............................................................................................................... 28

Programmed Operations ......................................................................................................................... 29

Positive Venting of Exhaust .................................................................................................................... 29

USER MAINTENANCE ............................................................................................................................... 32

Cleaning and Disinfecting ....................................................................................................................... 32

Electrical Components ............................................................................................................................ 33

Door Gaskets and Chamber Integrity...................................................................................................... 33

HEPA Filter Lifespan ............................................................................................................................... 33

Replacing the HEPA Filter Assembly ...................................................................................................... 34

Calibrate the Temperature display .......................................................................................................... 36

UNIT SPECIFICATIONS ............................................................................................................................. 40

Weight ..................................................................................................................................................... 40

Dimensions .............................................................................................................................................. 40

Capacity .................................................................................................................................................. 40

Shelf Capacity by Weight ........................................................................................................................ 40

Temperature ............................................................................................................................................ 41

Airflow Performance ................................................................................................................................ 41

4 | P a g e

Power ...................................................................................................................................................... 41

REPLACEMENT PARTS ............................................................................................................................ 42

5 | P a g e

INTRODUCTION

Thank you for purchasing a Sheldon Manufacturing Clean Room Oven. We know that in today’s
competitive marketplace, customers have many choices when it comes to constant temperature
equipment. We appreciate you choosing ours. Our continued reputation as a leading laboratory
product manufacturer rests with your satisfaction. Sheldon Manufacturing, Inc. stands behind our
products, and we will be here if you need us.

These ovens are intended for professional, industrial, and educational clean room applications
requiring horizontal shelf space airflows. The ovens are not designed for use at hazardous or
household locations.

Before you use your oven read this entire manual carefully to understand how to install, operate,
and maintain the oven in a safe manner. Keep this manual available for use by all oven operators.
Ensure that all operators are given appropriate training before the oven begins service.

GENERAL SAFETY CONSIDERATIONS

Note: Failure to follow the guidelines and instructions in this manual may create a protection

impairment by disabling or interfering with the unit’s safety features. This can result in injury
or death.

Your oven and its recommended accessories have been designed and tested to meet strict safety
requirements. For continued safe operation of your oven, always follow basic safety precautions
including:

 Follow all local or regional ordinances in your area regarding the use of this unit. If you

have any questions about local regulations, please contact the appropriate agency.

 Use only approved accessories. Do not modify system components. Any alterations or

modifications to your oven may be dangerous and will void your warranty.

 Always hardwire the unit’s power feed to a single phase, 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.

 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.

 Do not position the equipment in such a manner as to make it difficult to disconnect or

uncouple the power feed.

 Do not attempt to move the unit while in operation or before the unit has cooled.

6 | P a g e

INTRODUCTION (CONTINUED)

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.

CONTACTING ASSISTANCE

If you are unable to resolve a technical issue with the oven, please contact Sheldon Technical
Support. Phone hours for Sheldon Technical Support are 6am – 4:30pm 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. These will be found on the unit’s data plate, which is located on
the back of the unit at the top right, next to the power supply as mandated by regulatory
requirement.

EMAIL: [e-mail] PHONE: [phone] extension 4, or [phone] FAX: (503)
640-1366

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 sensor device must be
purchased separately for performing accuracy verifications and calibrations of the oven
temperature display.

The reference device must be accurate to at least 2°C, and should be regularly calibrated,
preferably by a third party.

For best results, use a digital device with wired-connected temperature sensing probe. For
example: a wire thermocouple probe that can be introduced into the oven chamber, leaving the
device outside. Readings taken from outside the unit avoid chamber door openings during
verifications and calibrations, and eliminate subsequent waits for the chamber temperature to re­stabilize before proceeding.

Select a probe suitable for the application temperature you will be calibrating or verifying the display
accuracy at.

Alcohol thermometers are insufficient for conducting accurate verifications and calibrations. Do not use a
mercury thermometer. Never place a mercury thermometer in the oven chamber.

7 | P a g e

Shelves (2)

Shelf Slides (4)

Leveling Feet (4)

Model Number

Serial Number

RECEIVING YOUR OVEN

Before leaving our factory, all Clean Room Ovens are packaged in high-quality shipping materials
to provide protection from transportation-related damage. When an oven leaves our factory, safe
delivery becomes the responsibility of the carrier. Damage sustained during transit is not
covered by the oven’s warranty. When you receive your High Performance Oven, inspect it for
concealed loss or damage to its interior and exterior. If you find any damage to the oven follow the
carrier’s procedure for claiming damage or loss.

INSPECTING THE SHIPMENT

Carefully inspect the shipping carton for damage. Report any damage to the carrier service that
delivered the oven. If the carton is not damaged, open the carton and remove the contents. The
unit should come with an Installation and Operation Manual, warranty card, a Certificate of
Compliance, and the Programming Guide – Watlow EZ-Zone Heating Profiles.

Verify that the correct number of shelves, shelf slides, and leveling feet have been included (see
the following table for quantities).

Included accessories

Carefully check all packaging before discarding. Save the shipping carton until you are certain that
the unit and its accessories function properly.

RECORDING DATA PLATE INFORMATION

Locate the data plate on the back of the oven next to the power inlet. The data plate contains the
oven model number and serial number. Enter this information below for future reference.

Date Plate Information

8 | P a g e

Fuse

Holders

External Power

Outlet

Nitrogen Gas

Inlet

Permanent Connect Wire Braid

14 gauge, 6 inches (15 cm)

Intake Vent

Exhaust Vent

Control Panel

Power Switch

Intake Vent Valve

Control

Exhaust Vent Valve

Control

Outer Door

Gasket

Chamber Ceiling

Liner

Right Wall

Chamber Liner

HEPA Filter
Assembly

Left Wall

Chamber Liner

Door Latch

Door Latch

Chamber Gasket

Figure 1: Orientation Photo

Note: The external

power outlet type
varies by country and

voltage.

39RECEIVING (CONTINUED)

ORIENTATION

Back Panel

9 | P a g e

INSTALLATION

Installation of an SMO5CR-2 requires permanent connect wiring (commonly known as hardwiring),
and must be performed by a qualified electrical technician. All other installation steps can be
performed by the end user.

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). Allow a minimum of 12 inches
(30cm) between the oven and any walls or partitions, and 24 inches (60cm) of vertical headspace

clearance above the top of the oven for unobstructed airflow and cooling. If the oven exhaust will be
vented from the workspace through a duct or other channeling, 12 inches (30cm) of vertical
clearance will suffice. Make sure the intake and exhaust vent remain unobstructed. Do not place
objects on top of oven, aside from the power exhaust accessory described in the manual.

Operating the unit outside of these conditions may adversely affect the oven temperature
range and stability. For conditions outside of those listed above, please contact your distributor or

Sheldon Sales to explore other ovens suited to your laboratory or production environment.

SELECTING A LOCATION

When selecting a location to install the oven, consider all conditions that can affect temperature
performance. For example:

 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

10 | P a g e

INSTALLATION (CONTINUED)

POWER SOURCE REQUIREMENTS

When selecting a location for the oven, check that each of the following requirements are satisfied:

 The oven must be positioned so that all operators have access to the power feed

disconnect in case of emergencies.

o The Disconnect must be in close proximity to the equipment and within easy reach

of the operator.

o The Disconnect must be marked as the disconnecting device for the equipment.

 The power source must be single (1) phase and protective earth grounded.
 The power source must match the voltage and ampere requirements listed on the oven

data plate. This oven is intended for 220 - 240 volt, 50/60 Hz applications at 12 Amps.

 The power source for the oven 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%. A separate circuit is
recommended to prevent possible loss of product due to overloading or failure of other
equipment on the same circuit.

 A switch or circuit-breaker must be used in the building installation. The required

circuit-breaker is 20 Amps

Fuses: The oven is provided with (2) two 20 amp fuses. These are located in holders adjacent to
the power feed braid on the back power panel of the unit. The fuses protect against overcurrent
conditions related to the operation of the oven. If one fuse blows, the oven will shut down. For safe
operation, the cause of a blown fuse should be determined prior to replacing it.

The oven is also provide with a pair (2) of 2 amp fuses installed adjacent to the external power
outlet. Please see the Orientation photo on page 9. The fuses protect against overcurrent
conditions related to the operation of the outlet and an attached power exhaust blower. If one fuse
blows, the outlet will depower. The cause of a blown fuse should be determined prior to replacing it.

POWER FEED WIRING

The oven comes provided with an integral 6 inch (15 cm) wire braid of two 14 gauge high­temperature (300°C) hot wires and a 14 gauge earth ground. See the Orientation Picture on page

9.
The wires for power source connection should be Green/Yellow – Earth; Black – Hot; Red – 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’s protections against potentially dangerous electric shocks and
create a possible fire hazard.

11 | P a g e

INSTALLATION (CONTINUED)

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 secure the door in the closed

position during transfers to prevent shifting and damage.

LEVELING

The oven must be level and stable for safe operation. Each Clean Room Oven ships with four
leveling feet. Insert one leveling foot into each of the four holes in the bottom corners of the oven.
Stand the oven upright. Then, adjust the foot at each corner until the oven stands level and solid
without rocking. To raise a foot, turn it in a counterclockwise direction; to lower a foot, turn it in a
clockwise direction.

Note: To prevent damage when moving the oven, turn each of the four leveling feet completely

clockwise.

INSTALL THE OVEN

Install the unit in a workspace location that meets the criteria discussed in the previous entries of
the Installation section. After wiring the oven to its power source, only energize the unit for brief
periods as necessary to test the wiring power feed and source.

INITIAL CLEANING

The unit was cleaned at the factory, but not sterilized. Additionally, it may have been exposed to
contaminants en route during shipping. See the Cleaning and Disinfecting topic in the User
Maintenance section (page 32) for more information on how to clean and disinfect the oven
chamber.

Remove all wrappings and coverings from shelving prior to cleaning and installation.

12 | P a g e

Figure 2: Installed Sliding Shelf

INSTALLATION (CONTINUED)

SHELVING INSTALLATION

The horizontal airflow within the chamber moves from the HEPA filter housing on the right-hand
side of the chamber, to the large holes on the left side. Place the shelves so they do not obstruct
the duct holes on the left in order to maximize airflow across the shelf space.

1. Install shelf slide hangers on opposites of the oven by inserting the slider’s tabs into the
chamber’s mounting slots, then pushing down gently to secure the slider.

2. Hang the shelf from the two installed sliders.

13 | P a g e

Symbol

Definition

Indicates that you should consult your user manual for further instructions.
Indique que l'opérateur doit consulter le manuel d'utilisation pour y trouver les instructions

complémentaires.

Indicates Adjustable Temperature
Indique température réglable

Indicates AC Power
Repère le courant alternative

Indicates I/ON and O/OFF
I repère de la position MARCHE de l'interrupteur d'alimentation
O repère de la position ARRÊT de l'interrupteur d'alimentation

Indicates protective earth ground
Repère terre électrique

Indicates UP and DOWN respectively
Touches de déplacements respectifs vers le HAUT et le BA

Indicates a Potential Shock Hazard
Signale danger électrique

Indicates the unit should be recycled (Not disposed of in land-fill)
Indique l’appareil doit être recyclé (Ne pas jeter dans une décharge)

Indicates: Caution hot surface
Indique: Avertissement symbole de surface chaude

GRAPHIC SYMBOLS

The oven is provided with multiple graphic symbols on its external and internal surfaces. The
symbols identify hazards and the functions of the adjustable components, as well as important
notes found in the user manual.

14 | P a g e