Thermo Scientific 3051 Series User manual

Precision Standard Ovens
3051 Series
Operating Manual and Parts List LT2034X2 Rev. 0
_________________________________________________________________________________
Part of Thermo Fisher Scientific

Thermo Scientific
MANUAL NUMBER LT2034X2 (7006907)
0 -- 7/23/10 Transfer to Marietta (was LT2034x2 4/8/09) ccs
REV ECR/ECN DATE DESCRIPTION By
Preface
Precision Standard Oven i
Models covered in this manual
Models Size Voltage
PR305140G (6907) 2.5 cu ft (Small) 240V
PR305140GCN (6908) 2.5 cu ft (Small) 240V
PR305145G (6909) 2.5 cu ft (Small) 120V
PR305150G (6910) 3.8 cu ft (Medium) 240V
PR305150GCN (6911) 3.8 cu ft (Medium) 240V
PR305155G (6912) 3.8 cu ft (Medium 120V
PR305160G (6913) 5 cu ft (Large) 240V
PR305160GCN (6914) 5 cu ft (Large) 240V
PR305165G (6915) 5 cu ft (Large) 120V

Thermo Scientificii Precision Standard Oven
Preface
Important Read this instruction manual. Failure to read, understand and follow the instructions in this manual
may result in damage to the unit, injury to operating personnel, and poor equipment performance. s
Caution All internal adjustments and maintenance must be performed by qualified service personnel. s
Material in this manual is for information purposes only. The contents and the product it describes are subject to
change without notice. Thermo Fisher Scientific makes no representations or warranties with respect to this
manual. In no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related to
the use of this manual.
©2010 Thermo Fisher Scientific. All rights reserved.

Thermo Scientific Precision Standard Oven iii
Preface
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Potential electrical hazards. Only qualified persons should perform procedures associated with this
symbol.
Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.
Hot surface(s) present which may cause burns to unprotected skin, or to materials which may be
damaged by elevated temperatures.
Marking of electrical and electronic equipment, which applies to electrical and electronic equipment
falling under the Directive 2002/96/EC (WEEE) and the equipment that has been put on the market
after 13 August 2005.
This product is required to comply with the European Union’s Waste Electrical & Electronic
Equipment (WEEE) Directive 2002/96/EC. It is marked with the WEEE symbol. Thermo Fisher
Scientific has contracted with one or more recycling/disposal companies in each EU Member State
European Country, and this product should be disposed of or recycled through them. Further
information on Thermo’s compliance with this directive, the recyclers in your country and
information on Thermo products will be available at www.thermofisher.com.
4Always use the proper protective equipment (clothing, gloves, goggles, etc.)
4Always dissipate extreme cold or heat and wear protective clothing.
4Always follow good hygiene practices.
4Each individual is responsible for his or her own safety.

Thermo Scientificiv Precision Standard Oven
Preface
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Precision Standard Oven vThermo Scientific
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Preparing the Oven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Limit Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Replacing the Door Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Adjusting the Door Cam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Replacing the Door Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Replacing the Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Accessing Electronics Compartment . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Replacing the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-5
Replacing the Control Thermocouple . . . . . . . . . . . . . . . . . . . . . . . .6-6
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 8
Section 7

Precision Standard Oven 1-1Thermo Scientific
Section 1 Introduction
Thermo Scientific Precision 3051 Series Standard ovens are available in
three sizes: Small, Medium and Large. All ovens provide analog, on/off
control at operating temperatures ranging from 50°C (122°F) to 225°C
(437°F).
Inlet air enters through a port located under the oven floor. Heat-
generated convection then gently moves the air in a vertical circulation
pattern. Exhaust air is vented through a port at the oven top.
The Small oven accommodates a maximum of five shelves. The Medium
oven holds eight shelves, while the Large holds up to eleven shelves.
Precision ovens incorporate a variety of safety features. A safety backup is
built into the controller: if the primary heater control fails, the backup will
maintain control at 5°C above the set point. An alarm LED then indicates
that the backup controller is operating the oven. A circuit breaker protects
the oven from power surges.

Precision Standard Oven 2-1Thermo Scientific
Section 2 Specifications
Performance Characteristics
Operating Range . . . . . . . . . . . . . . . . . .50 to 225°C
Average Uniformity @ 200°C . . . . . . . . . . . .±4.5°C
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1°C
Control Sensitivity . . . . . . . . . . . . . . . . . . . . .±0.5°C
Recovery Time @ 200°C (door opened one minute)
Small ovens 2.0 minutes
Medium ovens 4.0 minutes
Large ovens 4.0 minutes
Rise Time to 225°C
Small ovens 45 minutes
Medium ovens 60 minutes
Large ovens 120 minutes
Air Exchanges
Small ovens 24 per hour
Medium ovens 16 per hour
Large ovens 12 per hour
BTU/hr Output @100°C @200°C
Small ovens 470 1325
Medium ovens 1040 2025
Large ovens 1150 2040

2-2 Precision Standard Oven Thermo Scientific
Section 2
Specifications
Electrical Requirements
Small ovens
PR305145G . . . . . . .120V, 11A, 1320W, 50/60 Hz
PR305140G . . . . . . .240V, 5.5A, 1320W, 50/60 Hz
PR305140GCN . . . .240V, 5.5A, 1320W, 50/60 Hz
Medium ovens
PR305155G . . . . . . .120V, 11A, 1320W, 50/60 Hz
PR305150G . . . . . . .240V, 5.5A, 1320W, 50/60 Hz
PR305150GCN . . . .240V, 5.5A, 1320W, 50/60 Hz
Large ovens
PR305165G . . . . . . .120 V, 11A, 1320W, 50/60 Hz
PR305160G . . . . . .240 V, 5.5A, 1320W, 50/60 Hz
PR305160GCN . . . .240V, 5.5A, 1320W, 50/60 Hz
Chamber Volumes
Small ovens . . . . . . . . . . . . . . . . . . . . . . . . .2.5 cu ft
Medium ovens . . . . . . . . . . . . . . . . . . . . . . .3.8 cu ft
Large ovens . . . . . . . . . . . . . . . . . . . . . . . . .5.0 cu ft
Chamber Dimensions (W x D x H)
Small ovens . . . . . . . . . . . . . . . . . .18 x 18 x 13.5 in
Medium ovens . . . . . . . . . . . . . . . . .18 x 18 x 20 in
Large ovens . . . . . . . . . . . . . . . . . .18 x 18 x 26.5 in
Environmental Conditions
Operating: 17°C to 27°C; 20% to 80% RH, non-condensing.
Installation Category II (overvoltage) in accordance with IEC 664.
Pollution Degree 2 in accordance wth IEC 664.
Altitude Limit: 2,000 meters.
Storage: -25°C to 65°C 10% to 85% relative humidity (RH)

Precision Standard Oven 3-1Thermo Scientific
Section 3 Installation
The oven requires an area approximately 2 ft. x 2 ft. Two inch air clearance
on all sides (6” if combustible materials) and a minimum of 24” air
clearance on top is needed to allow heat dissipation and prevent
temperature build-ups. The bench selected must be capable of supporting
at least 120 lbs. for small ovens, 130 lbs. for medium ovens, or 135 lbs. for
large ovens. Proper electrical power must be available. Locate the oven so
that no extension cord is required.
Note If the equipment is not used in a manner specified by manufacturer,
the protection provided by the equipment may be impaired. s
Warning Do not use top of oven as a shelf. s
Do not cover oven vent hole.
Keep combustible materials away from oven vent hole.
Warning Hot surface! Oven vent and exiting air are hot. Keep hands away.
Thermo Scientific Precision ovens are shipped in a single carton. After
unpacking, locate each item shown in the list below. Report any missing
items, by name and part number, to your Thermo Scientific distributor. In
the event of shipping damage, retain the shipping material and file a claim
with the final carrier.
Item
Shelves - Two provided (one fixed, one moveable)
Shelf Supports - Four provided
Unpacking

3-2 Precision Standard Oven Thermo Scientific
Section 3
Installation
To prepare the oven for operation, perform the following procedures:
1. Install the shelf.
2. Verify all packing material has been removed from oven chamber.
3. Connect the line cord to an appropriate electrical outlet.
4. The oven is now ready for operation. No preliminary adjustments are
required.
Caution See data plate on oven for voltage, current and line frequency
specifications. Check that the power requirements of the oven will not
overload the circuit. s
Note The oven received a single point calibration at 120° C ± 2°C at the
factory. If greater accuracy is required the user may require a standard
laboratory calibration (see Calibration section). s
The 3051 Series ovens feature a front panel mounted power
switch which is a combination power switch and circuit breaker,
eliminating the need for separate fusing. The circuit breaker will
interrupt power in the event of an oven heater malfunction.
Press the I (upper) half of the rocker-type power switch to turn
the oven On. Press the 0 (lower) half to turn Off oven power. To
reset the breaker, first place the switch to the Off position, then
return it to the On position.
Preparing the Oven
Power Switch
On
Off

Precision Standard Oven 4-1Thermo Scientific
Section 4 Controls
The 3051 Series controller features three LEDs which indicate,
respectively, that power is being applied to the oven heaters, an alarm
condition exists or that oven power is on. A temperature dial, marked in
10° increments, serves to set the oven temperature.
Temperature Dial
Sets the oven operating temperature in degrees Celsius (°C).
Heat Indicator
Lights when power is being supplied to the oven heater.
Alarm Indicator
Lights if the actual oven temperature exceeds the alarm temperature. The
alarm temperature is factory-adjusted to be 5°C above the set tempera-
ture.
Power Indicator
Lights when power is on.
Figure 4-1. Front Panel

Precision Standard Oven 5-1Thermo Scientific
Section 5 Operation
The 3051 Series ovens maintain a set temperature until that set
temperature is changed.
To achieve a set temperature, simply perform the following:
1. Rotate the temperature dial full counter-clockwise.
2. Place the power switch in the ON position. The Power indicator will
come on.
3. Rotate the temperature dial to the desired set temperature. The Heat
indicator will then come on.
4. When the actual temperature approaches the set temperature, the Heat
indicator will cycle on and off, maintaining the set temperature.
Note
1. After controlling at a given temperature, if the temperature dial is
rotated CCW, the alarm indicator will come on. This is normal
operation.
2. Since this is an analog control with 10° increments, the user can choose
to add a thermometer and make minor adjustments to reach a more
precise temperature setting.

5-2 Precision Standard Oven Thermo Scientific
Section 5
Operation
Before operating the oven, always observe the following Safety Precautions:
This unit is not explosion-proof, do not use in the presence of flammable
or combustible materials; fire or explosion may result. Unit contains
components, which may ignite such materials.
Fumes and spillage from acidic solutions cause corrosion of the stainless
chamber. Care should be taken to maintain a neutral pH at all times.
• Wear insulated gloves
• Use tongs
• Never stand in front of an open oven
• Use safety goggles
Caution Removal of safety shield, shelf support, and/or shelf will result in
voiding of warranty. Heater cover is not a suitable replacement for a shelf
and must not be used as such. Use of heater cover as a shelf may result in
fire. s
The 3051 Series controllers feature a deviation alarm which alerts the
operator and interrupts heater power whenever the actual oven temperature
differs from the set temperature by more than 5°C. This set limit cannot be
adjusted by the operator.
If the actual temperature exceeds the alarm limit, the alarm indicator LED
will light.
The reference point for the alarm is the set temperature. Any change in the
set temperature will cause a corresponding shift in the alarm temperature.
Example:
If the set temperature is 150°C, the alarm will trip at 155°C. If the set
temperature is changed to 200°C, the alarm will follow the set temperature
and trip at 205°C.
Changing the set temperature to a value more than 5°C below the present
oven temperature will trip the alarm. Power is removed from the heater
when an alarm condition occurs.
Safety Precautions
Limit Alarms

The 3051 Series controllers are factory calibrated near the center of the
oven's operating range and will usually remain reasonably accurate over a
long period of usage. However, should the accuracy diminish with time, or
should the user require greater accuracy at a particular temperature setting,
the controller may be recalibrated.
The temperature controller has high and low temperature range
adjustments located under the skirt of the set temperature dial.
To recalibrate the controller, perform the following procedures:
1. Place a calibrated thermometer (preferably traceable to NIST
standards) in oven chamber.
2. Rotate temperature dial full counterclockwise (CCW).
3. The dial line should point to 20°C. If not, loosen the setscrew holding
the dial on its shaft. Rotate shaft until dial line points to 20°C, then
re-tighten set screws.
4. Press oven Power switch to ON (1) position.
5. Rotate temperature dial to 40°C. Heat indicator will come on full,
then begin to cycle on/off as the oven approaches final temperature.
6. After the heat indicator begins cycling, allow an additional 30 minutes
for the oven to achieve a final, stable temperature.
7. Carefully remove the temperature dial knob without rotating it.
(continued)
Precision Standard Oven 5-3Thermo Scientific
Section 5
Operation
Calibration
Low Adjust
High Adjust
Figure 5-1. High and Low Temperature Range Adjustments

8. Use a thin blade screwdriver to calibrate Low Adjust. Check
thermometer reading. If reading is less than 35°C, rotate Low Adjust
CCW slightly to turn heater on. If reading is above 45°C, rotate Low
Adjust CW slightly to turn heater off at lower temperature. After each
adjustment allow sufficient time for oven temperature to restabilize.
Repeat until thermometer reading is 40°C ±5°C
9. Replace temperature dial knob with pointer at 40°C, then tighten
setscrew, being careful not to rotate the dial shaft.
10. Set temperature dial to 200°C.
11. After the Heat indicator begins cycling on/off, allow an additional 30
minutes for oven to reach a final, stable temperature. If thermometer
reads 200 ±5°C, calibration is complete. Otherwise, continue with
following steps.
12. Carefully remove the temperature dial knob without rotating it.
13. Use a thin blade screwdriver to calibrate High Adjust Check
thermometer reading. If reading is less than 195°C, rotate High Adjust
CW slightly to turn heater on. If reading is above 205°C, rotate High
Adjust CCW slightly to turn heater off at lower temperature. After
each adjustment, allow sufficient time for oven temperature to
restabilize. Repeat until thermometer reading is 200 ±5°C.
14. Replace temperature dial knob with pointer at 200°C, then tighten
setscrew, again being careful not to rotate the dial shaft.
15. Set the temperature dial to 180°C. The Alarm indicator should come
on if calibration is correct.
5-4 Precision Standard Oven Thermo Scientific
Section 5
Operation
Calibration
(continued)

Section 6 Service
The following sections describe procedures for servicing the 3051 Series
ovens. Most users may perform the first procedure, replacing the Door
Gasket. However. All other service procedures involve potential exposure
to line voltage. Only qualified service personnel should undertake these
procedures. The second section, Accessing the Electronics Compartment,
describes procedures required for subsequent service sections and is
referenced by these later sections when required.
If needed, call Technical Services for assistance.
Caution Allow oven to cool to ambient temperature before attempting
repair. s
Caution Only factory authorized components should be used for all
repairs. Failure to use factory authorized replacement components will void
warranty and could result in unit malfunction and or hazardous operating
conditions. s
Caution Service procedures involve exposure to line voltage and should be
performed only by qualified service personnel. Disconnect oven from
power source before attempting repairs. s
Precision Standard Oven 6-1Thermo Scientific