Shellab SGO5-2 User Manual

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MICROPROCESSOR

CONTROLLED OVEN

SGO5 SGO5-2

PREVIOUSLY DESIGNATED

CE5G CE5G-2

Revised 12/2013

4861568

INSTALLATION AND OPERATION MANUAL

Sheldon Manufacturing Inc. P.O. Box 627 Cornelius, Oregon 97113

EMAIL: [e-mail] INTERNET: http://www.Shellab.com/~Shellab

2

TABLE OF CONTENTS

SECTION 1.0 RECEIVING AND INSPECTION
SECTION 2.0 GRAPHIC SYMBOLS
SECTION 3.0 INSTALLATION
SECTION 4.0 PRECAUTIONS
SECTION 5.0 CONTROL PANEL OVERVIEW
SECTION 6.0 OPERATION
SECTION 7.0 MAINTENANCE
SECTION 8.0 TROUBLESHOOTING

SECTION 9.0 PARTS LIST, UNIT SPECIFICATIONS,
SCHEMATICS

These units are TUV CUE listed as forced air ovens for professional, industrial, or educational use where the
preparation or testing of materials is done at approximately atmospheric pressure 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 61010-1:2004 + R:2005-07 + R:2008-10
UL 61010A-2-010:2002
UL 61010-1:2012
EN 61010-1:2010
EN 61010-2-010:2003

IEC 61010-1:2010
IEC 61010-2-010:2003

3

RECEIVING AND INSPECTION

Section

1

Your satisfaction and safety require a complete understanding of this unit. Read
the instructions thoroughly and be sure that all users are given adequate training
before attempting to use this unit. Note: This equipment must be used only for its
intended purpose; any alterations or modifications will void your warranty.

1.1 Inspection: The carrier, when accepting shipment, also accepts responsibility for

safe delivery and is liable for loss or damage claims. On delivery inspect for visible
exterior damage, note and describe on the freight bill any damage found and enter
your claim on the form supplied by the carrier.

1.2 Inspect for concealed loss or damage on the unit itself, both interior and exterior. If
any, the carrier will arrange for official inspection to substantiate your claim.

1.3 Accessories: Verify that your accessory package is complete. All units should
have a set of four (4) Leveling feet, two (2) shelves and eight (8) shelf clips.

1.4 Return Shipment: Save the shipping crate until you are sure all is well. If for any
reason you must return the unit, contact your customer service representative for
authorization and supply data plate information. Make sure to include the model
and unit serial number. The service representatives will furnish you with a return
authorization number and address for return. Note: Make sure this return
authorization number appears on the unit packaging and shipping papers. Units
returned without proper authorization may not be accepted at the factory. For
information on where to contact Customer Service please see the manual cover.

4

GRAPHIC SYMBOLS

Section

2

Your oven has been provided with a display of graphic symbols which should help in
identifying the use and function of the available user adjustable components.

2.1 This symbol indicates that you should consult your manual for further

description or discussion of a control or user item.

2.2 Indicates "AC Power".

2.3 Indicates "Manual Control".

2.4 Indicates "Timer".

2.5 C Indicates "Degrees Celsius".

2.6 Indicates "Temperature".

2.7 Indicates "Over Temperature Safety".

2.8 Indicates “Earth Ground Symbol”.

2.9 Indicates “Potential Shock Hazard” behind this panel.

2.10 Indicates “Unit should be recycled” (Not disposed of in land-fill)

5

INSTALLATION

Section

3

Local city, county or other ordinances may govern the use of this equipment. If you have any questions about
local requirements, please contact the appropriate local agency. Installation may be performed by the end
user.

Under normal circumstance this unit is intended for use indoors, at room temperatures between 5 and 40
C, at no greater than 80% Relative Humidity ( at 25C ) and with a supply voltage that does not vary by more
than 10%. Customer service should be contacted for operating conditions outside these limits.

3.1 Power Requirements: The unit power requirements are listed on the units data plate located on the

right front side of the oven. Make sure your power supply matches that shown on the data plate.
VOLTAGE SHOULD NOT VARY MORE THAN 10% FROM THE DATAPLATE RATING. These
units are intended for 50/60HZ application. A separate circuit is recommended to preclude loss of
product due to overloading or circuit failure.

3.2 Location: Select a site for the oven which is free from extreme heat, cold or excessive air
movement such as areas near steam radiators, stoves, other ovens, autoclaves, direct sun, heating
and cooling ducts, etc. Avoid high traffic areas which may reduce the accessibility to the oven. Allow
at least 30 cm of space between the oven and surrounding walls or partitions which might obstruct
free airflow.

3.3 Lifting / Handling: These units are heavy and care should be taken to use appropriate lifting
devices that are sufficiently rated for these loads. Units should only be lifted from their bottom
surfaces. Doors, handles and knobs are not adequate lifting or stabilization. The unit should be
completely restrained from tipping during lifting or transport. All moving parts, such as shelves and
trays should be removed and doors need to be positively locked in the closed position during transfer
to prevent shifting and damage.

3.4 Leveling: The unit must sit level and solidly. Leveling feet (supplied) are to be installed in the holes

3.5 Cleaning: The oven's interior was cleaned at the factory, but not sterilized. Remove all interior parts

3.6 Burning In: It is recommended that the unit go through a “burning in” process prior to operation.

at the base of the oven. Turn them counterclockwise to raise the level and clockwise to lower the
level. If the unit must be moved, turn the leveling feet in all the way to prevent damage.

if assembled and clean the inside of the chamber thoroughly with a disinfectant that is suitable for
your application. Make sure to rinse the cleaned surface with a damp cloth, using water only, and
dry the surfaces with a clean cloth. DO NOT USE chlorine-based bleaches or abrasives as they will
damage the stainless steel surface. DO NOT USE spray cleaners that might leak through openings
and cracks and get on electrical parts or that may contain solvents that will harm the coatings. A
similar periodic cleaning is recommended.

WARNING: Never clean the unit with alcohol or flammable cleaners with the unit connected to the
electrical supply. Always disconnect the unit form the electrical service when cleaning and assure all
volatile or flammable cleaners are evaporated and dry before reattaching the unit to the power
supply.

This is to eliminate the smoking of protective coatings on the element. Read sections 4, 5 and 6
carefully to understand operating requirements. To burn in turn the Overtemperature Safety to
maximum and set the digital display to 200. Run for a minimum of one hour under ventilation until
smoke dissipates.

6

PRECAUTIONS

Section

4

4.1 The bottom surface of the chamber should not be used as a work surface.

4.2 This unit has been designed with a dampered vent from the chamber. In order to

work effectively and safely, some precautions will need to be taken by the
operator.

A. In most applications, the exhaust damper will need to be opened during

drying or degassing for best results.

B. THIS OVEN IS NOT DESIGNED TO HANDLE COMBUSTIBLE GASSES

AND IS NOT AN EXPLOSION PROOF UNIT. Do not place explosive,
combustible, or flammable materials into the chamber.

C. Some of the out gassed by products may be hazardous or unpleasant to

operating personnel. If this is the case, the exhausts should be positively
ventilated to the outside and dealt with according to local regulations. Your
dealer can provide you with a power exhaust which greatly helps under
these applications.

4.3 Do not operate near noxious fumes.

4.4 Do not place sealed or filled containers in the oven chamber.

4.5 Do not cut or remove the ground prong from the power cord.

4.6 Do not use a 2-prong adapter plug.

4.7 Be sure that the power supply is of the same voltage as specified.

4.8 Disconnect the unit from its electrical source before proceeding to make any

4.9 If a mercury thermometer is used for calibration and breakage should occur, all

4.10 This oven is NOT designed for the use in Class I, II, or III locations as defined by

4.11 This oven is not intended, nor can it be used, as a patient connected device.

electrical repairs or replacements.

spilled mercury MUST be completely removed from the chamber before continuing
operation.

the National Electric Code.

7

CONTROL PANEL OVERVIEW

Section

5

5.1 Power Switch: The main power switch on the control panel (green lighted I/O) controls

all power to the oven. It must be in the I/On position before any systems are operational.
The green pilot light in the switch will be lighted when the switch is in the ON position.

5.2 Timer Switch: The black I/O power switch marked TIMER is located to the right of the
main power switch. It controls the power to the time circuit. In the O/Off position the oven
heat is controlled with no timed duration. In the I/On position heat is controlled for a timed
interval and then the heat shuts off.

5.3 Overtemperature Safety Thermostat: This control is marked HIGH LIMIT and is
equipped with an adjustment knob and a graduated dial from 0 - 10. It is independent of
the Main Controller and guards against any failure which would allow temperature to rise
past the Main Controllers set point. This allows continued operation of the oven until the
problem can be corrected or service can be arranged. It is not recommended that the unit
be operated for extended periods of time using only the Overtemperature Safety as the
temperature controller as temperature uniformity will suffer.

5.4 OTP Light: This pilot lamp is directly above the Overtemperature Safety Thermostat.
The light will come on when the Safety Thermostat has been activated and taken control
of the oven. Under normal operating conditions the pilot lamp should never be on.

5.5 Timer Control: This control is marked SET/TIMER and consists of a digital display,
UP/DOWN arrow pads, a RESET "PUSH" pad, a START/STOP "PUSH" pad and a
TIMER ACTIVATED light. This control provides the ability to set a timed heat interval,
activate the start-up of the timed heat cycle and shut down the timed heat cycle
automatically.

5.6 Main Temperature Controller: This control is marked SET/TEMPERATURE and

consists of the digital display and UP/DOWN arrow pads for inputting set point
temperatures and calibration.

5.7 Temperature Activated Light: This pilot lamp will be lit whenever the elements are

receiving power.

8

OPERATION

Section

6

6.1 Connection to Power Supply: Assure that the electrical power supply is properly configured and
rated for the oven and plug the unit cord into the receptacle.

6.2 Push the main power switch to the On position. The digital temperature display will indicate a
temperature value. Turn the Overtemperature Safety Thermostat to its maximum position,
clockwise using a coin or flat head screwdriver.

6.3 Set The Main Temperature Control: To enter the desired set point temperature, press either the
UP or DOWN arrow pad one time on the SET/TEMPERATURE digital display. The display will start
to blink from bright to dim. While blinking, the display is showing the temperature set point which can
be changed by pushing the UP or DOWN arrow pads to raise or lower the value. If the arrow pads
are not pushed within five (5) seconds, the display will stop blinking and return to read the chamber
temperature. Allow several hours for the temperature to stabilize.

6.4 Calibrate The Main Temperature Control: It is recommended that display is calibrated once the
unit is installed in its working environment and has been stabile at set point for several hours. Place
a reference thermometer through the damper tube at the top of the unit adjacent to the exhaust port.
Be certain the thermometer does not touch any shelving. Allow again for the temperature to stabilize
until five (5) consecutive readings at one minute intervals show no temperature change. Compare
the reading on the reference thermometer with the digital display. If there is an unacceptable
difference, put the display in calibrate mode by pressing the UP and DOWN arrow pads at the same
time until the decimal points blink on and off. While blinking, the display can be changed to match
the reference thermometer by pushing the UP or DOWN arrow pads to raise or lower the
temperature until the display reads the correct value. If no arrow pads are pressed within five (5)
seconds the display will revert to displaying the temperature within the chamber.

NOTE: Temperature accuracy should be checked at least monthly or after the unit has been turned off for
an extended period of time.

6.5 Set The Overtemperature Safety Thermostat: The Overtemperature Safety should be initially set

6.6 Set Timer Display: Turn the timer switch to the ON position. The SET/TIMER display digits will

to its maximum position when stabilizing the set point temperature. Once the oven is stabile at the
desired set point, turn the Overtemperature Safety counterclockwise (using a coin or flat-head
screwdriver) until the OTP light comes on. Next turn the Safety clockwise just until the OTP light
goes off. Then turn the Safety clockwise two (2) minor increments on its scale past the point where
the light went out. This sets the Overtemperature Safety Control at approximately 10C above the
Main Temperature set point.

light with no lighted decimals showing (See Figure 2). Note that, if during any of the following steps,
several seconds elapse with no arrow pad or reset pad activity, the timer will default to the present
displayed setting and it will be necessary to restart all functions over again. The values must be
programmed in a consecutive manner with no delays between settings or the default will occur.

A. Hour Function: Press and hold the RESET pad until the digits start blinking and a blinking

decimal shows between digits 2 and 3. In this mode, pressing the UP or DOWN arrow pads
increases or decreases the whole hour value from 0 to 99 (digits 1 and 2).

B. Ten Minute Function: After the correct value for hours is set, push the RESET pad again.

The blinking decimal will now move one digit to the right between digits 3 and 4. Pushing
the UP or DOWN arrow pads will increase or decrease the ten minute function allowing

9

values between 0 and 5 to be set (digit 3).

C. One Minute Function: After the correct ten minutes value is set, push the RESET pad

again. The blinking decimal point will move one digit to the right beyond digit 4 and be
located at the extreme bottom right of the display. With the display in this mode, pushing the
UP or DOWN arrow pad will increase or decrease the one minute function allowing the
value of digit 4 to be adjusted between 0 and 9.

D. Activation: Pause until the timer stops blinking. After all settings are made, push the

START/STOP button. The Timer Activated light will come on and after a brief pause, the
present oven temperature settings will be valid and heating will begin. The oven will now
heat up, control at the set point and stop after the timed period on the SET/TIMER display
has elapsed.

Note that when the system is in the timer mode, the heating circuit is de-energized until the START/STOP
button is pushed or the TIMER SWITCH is turned Off. If a time change or correction is necessary and the
timer has already been activated, push the START/STOP button to "STOP" the timer, then repeat steps A
through D above.

6.7 To set the timer so that timed operation will not start until the oven is stable at set point, pre-heat the
oven in the normal mode until the desired temperature has stabilized. Turn on the timer switch.
Push and hold the RESET button until the timer display blinks. (This is to be sure that the pre-set
timed value is correct). Press the START/STOP button to activate the timer.

10

MAINTENANCE

Section

7

Note: Disconnect the power cord from the power source before performing any
service or maintenance on this unit.

7.1 Cleaning: Cleaning and decontamination are recommended on a regular basis.
To prepare the unit for cleaning, remove all interior parts if assembled, such as
shelves and shelf clips.

First clean the chamber with soap and water, rinse and let dry. To decontaminate
use a solution that is appropriate for your application. DO NOT USE chlorine­based bleaches or abrasives as this can damage the stainless steel components.
DO NOT USE spray cleaners that might leak through openings and cracks and get
on electrical parts or that may contain solvents that will harm the coatings.

WARNING: Never clean the unit with alcohol or flammable cleaners with the unit
connected to the electrical supply. Always disconnect the unit from the electrical
service when cleaning and assure all volatile or flammable cleaners are
evaporated and dry before reattaching the unit to the power supply.

7.2 Use care when cleaning the door gasket to prevent damage which could impair the
positive door seal.

7.3 STORAGE: To prepare the unit for storage, remove all shelves and shelf clips
and disconnect the power supply. Be certain that the chamber is completely dry
and door is positively locked in the closed position. See Section 3.3,
Lifting/Handling, for proper transport procedures.

7.4 No maintenance is required on the electrical components. If the unit fails to operate
as specified, please see the Troubleshooting guide, Section 8.0, before calling for
service.

11

TROUBLESHOOTING

TEMPERATURE

Temperature too high.

1/ Controller set too high-see section 6.3
2/ Controller failed on – call Customer Service.
3/ Wiring error – call Customer Service.

Display reads "HI" or "400"+.

Probe is unplugged, is broken or wire to sensor is broken – trace
wire from display to probe; move wire and watch display to see
intermittent problems

Chamber temp spikes over set point
and then settles to set point.

Recalibrate – see section 6.4.

Temperature too low

1/ High limit set too low – see section 6.5.
2/ Controller set too low – see section 6.3.
3/ Unit not recovered from door opening – wait for display to stop
changing.
4/ Unit not recovered from power failure or being turned off –
ovens will need several hours to warm up and stabilize.
5/ Element failure – compare current draw to data plate.
6/ Controller failure – call Customer Service.
7/ High limit failure – confirm with front panel lights that Safety
Thermostat is operating correctly.
8/ Wiring problem – check all functions and compare wiring to
owners manual - especially around any areas recently worked on.
9/ Loose connection – check control panel for loose connections.

Display reads "LO"

1/ Bad probe or disconnected – call Customer Service.
2/ If ambient temperature is lower than range of unit – compare set
points and ambient temperature to rated specifications in section

9.0.

Unit will not heat over a temperature
that is below set point

1/ On F suffix models confirm that fan is moving and that
amperage and voltage match data plate – check for air movement
in chamber.
2/ Confirm that set point is set high enough –turn Safety
Thermostat all the way clockwise and see if OTP light comes on.
3/ Check connections to sensor.
4/ Check calibration – using independent thermometer, follow
instructions in section 6.4.

Unit will not heat up at all

Section

8

12

1/ Check amperage – amperage should be virtually at maximum
rated (data plate) amperage.
2/ do all controller functions work?
3/ Is the Safety Thermostat set high enough? – for diagnostics,
should be fully clockwise with the OTP light never on.
4/ Has the fuse/circuit breaker blown?
5/ Has timer turned unit off?

Indicated chamber temperature
unstable

1/ ±0.1 may be normal.
2/ For G suffix models: may vary ±2.0 degrees.
3/ For F suffix models: is fan working? –verify movement of air in
chamber.
4/ Is ambient room temperature radically changing – either door
opening or room airflow from heaters or air conditioning ? –
stabilize ambient conditions.
5/ This may happen if exhaust stack is 100% open or if power
exhaust is cycling – adjust stack to at least ¼ closed.
6/ Sensor miss-located, damaged or wires may be damaged ­check mounts for control and OTP sensors, then trace wires or
tubing between sensors and controls.
7/ Calibration sensitivity – call Customer Service.
8/ High limit set too low – be sure that Safety Thermostat is set
more than 5 degrees over Main Controller set point; check if OTP
pilot is on continuously; turn controller knob completely clockwise
to see if problem solved then follow instructions in section 6.5 for
correct setting.
9/ Electrical noise – remove nearby sources of RFI including
motors, arcing relays or radio transmitters
10/ Bad connection on temperature sensor or faulty sensor –
check connectors for continuity and mechanical soundness while
watching display for erratic behavior; check sensor and wiring for
mechanical damage.
11/ Bad connections or faulty solid state relay – check connectors
for mechanical soundness and look for corrosion around
terminals or signs of arcing or other visible deterioration.

Will not maintain set point

1/ Assure that set point is at least 5 degrees over ambient.
2/ See if ambient is fluctuating; check for adjacent open doors or
HVAC duct openings – stabilize ambient conditions.

Display and reference thermometer
don’t match

1/ Calibration error – see section 6.4.
2/ Temperature sensor failure – call Customer Service.
3/ Controller failure – call Customer Service.
4/ Allow at least two hours to stabilize.
5/ Verify that reference thermometer is certified.

Can't adjust set points or calibration

1/ Turn entire unit off and on to reset.
2/ If repeatedly happens, call Customer Service.

Calibrated at one temperature, but not
at another

This can be a normal condition when operating temperature varies
widely. For maximum accuracy, calibration should be done at or
as close to the set point temperature.

MECHANICAL

Motor doesn't move; F suffix models

1/ If shaft spins freely: check connections to motor and check voltage to
motor.
2/ If shaft rubs or is frozen, relieve binding and retest.

Motor makes noise; F suffix models

13

1) Make sure that the fan or blower wheel is not contacting its housing.
Adjust the motor mounting bracket position to re-center the fan or
blower wheel, if necessary.

2) Check the fan or blower wheel for damage or out of balance
condition. Replace the fan or blower wheel if it is damaged or out of
balance.

3) Turn the motor shaft to make sure that it spins freely. If it binds or the
bearings make a rubbing or scrapping sound then replace the motor.

Door not sealing

1/ Adjust hinge blocks or twist the door.
2/ Confirm that unit has not been damaged and body is not square.
3/ Check physical condition of gasket for tears or punctures.

OTHER

Controller on at all times - "locked-up"

1/ Adjust set point to room temperature. If the unit is still heating,
replace the solid state relay.
2/Turn unit off and on to reset.
3/ If cannot change any condition on the front panel, call Customer
Service.

Controller timer resets on its own

1/ Confirm that power from wall is consistent and within
specifications.
2/ Call Customer Service with serial number.

Front panel displays are all off

1/ Check connections to the temperature display control board and
assure that all are tight and in the correct orientation.
2/ Check for wire damage.

Unit or wall fuse/circuit breaker is
blown

1/ Check wall power source.
2/ Compare current draw and compare to specs on data plate.
3/ See what other loads are on the wall circuit.

Unit will not turn on

1/ Check wall power source.
2/ Check fuse/circuit breaker on unit or in wall.
3/ See if unit is on, e.g., fan or heater, and just controller is off.
4/ Check all wiring connections, especially around the on/off
switch.

Unit is smoking – Out of box

This is not an uncommon occurrence when first operating new
units. Put unit under vent and run at high temperature for one hour
until smoke disipates.

Contamination in chamber

1/ See cleaning procedure in section 7.0.
2/ Develop and follow standard operating procedure for specific
application; include definition of cleaning technique and
maintenance schedule.

Contamination in sample

1/ See “Contamination in chamber”.
2/ Reduce air flow in chamber by dampening down exhaust port;
be sure to verify adequate temperature uniformity at the reduced
air flow.
3/ Protect open samples from areas of maximum air current, e.g.,
inlet air ducts.

14

PARTS LIST

Description

115v

220V

EMI Filter

2800503

2800502

Adjustable Feet

2700512

2700512

Control Knob

4450506

4450506

Cord Set

1800510

1800500

Door Latch

3800605

3800605

Fuse Holder

N/A

3300501

Fuse, 10 Amp 250V

N/A

3300516

Fuse, 16 Amp

3300513

N/A

I/O (On/Off) Power Switch

7850570

7850570

Overtemperature Safety Thermostat

1750615

1750615

Pilot Lamp, Green

4650554

4650554

Pilot Lamp, OTP Red

4650553

4650553

Shelf Clips

1250511

1250511

Shelf

5130725

5130725

Solid State Relay

7030527

7030527

Timer Switch

7850579

7850579

Main Control W/Timer

1750675

1750674

Heating Element

9570821

9570821

Section

9

15

UNIT SPECIFICATIONS

Weight

Shipping

Net

All Models

200 lbs.

93 lbs.

Dimensions

Exterior WxDxH (in.)

Interior WxDxH (in.)

All Models

30.00 x 25.563 x 38.0

21.00 x 19.50 x 21.00

Capacity

Cubic Feet

All Models

5.0

Temperature

Range

Uniformity

Recovery

All Models

10 above amb. to 225C

+3.0C at 110C

9 min. at 110C

16

WIRING DIAGRAM

All

Models