Thermo Scientific 3050 User manual

Precision Premium Ovens
3050 Series
Operating Manual and Parts List LT2148X2 Rev. 1
_________________________________________________________________________________
Part of Thermo Fisher Scientific

Thermo Scientific
MANUAL NUMBER LT2148X2 (7006947)
1 -- 1/4/11 Corrected typo page 4-1 (control temperature is being ‘The 3050 Series The’ ) to ‘set’ ccs
0 -- 4/22/10 Transfer to Marietta (was LT2148X2 2/8/10) ccs
REV ECR/ECN DATE DESCRIPTION By
Preface
Precision Premium Oven i
Models covered in this manual
Models Size Voltage Forced Air/Gravity
PR305040G (6947) - Small 2.5 cu ft 240V Gravity
PR305040GCN (6948) - Small 2.5 cu ft 240V Gravity
PR305040M (6949) - Small 2.5 cu ft 240V Forced Air
PR305040MCN (6950) - Small 2.5 cu ft 240V Forced Air
PR305045G (6951) - Small 2.5 cu ft 120V Gravity
PR305045M (6952 )- Small 2.5 cu ft 120V Forced Air
PR305050G (6953) - Medium 3.8 cu ft 240V Gravity
PR305050GCN (6954) - Medium 3.8 cu ft 240V Gravity
PR305050M (6955) - Medium 3.8 cu ft 240V Forced Air
PR305050MCN (6956) - Medium 3.8 cu ft 240V Forced Air
PR305055G (6957) - Medium 3.8 cu ft 120V Gravity
PR305055M (6958) - Medium 3.8 cu ft 120V Forced Air
PR305060G (6959) - Large 5 cu ft 240V Gravity
PR305060GCN (6960) - Large 5 cu ft 240V Gravity
PR305060M (6961) - Large 5 cu ft 240V Forced Air
PR305060MCN (6962) - Large 5 cu ft 240V Forced Air
PR305065G (6963) - Large 5 cu ft 120V Gravity
PR305065M (6964) - Large 5 cu ft 120V Forced Air

Thermo Scientificii Precision Premium 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 Scientific. All rights reserved.

Thermo Scientific Precision Premium 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 Premium Oven
Preface
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Precision Premium 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
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Display Offsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Limit Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Replacing the Door Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Adjusting the Door Cam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Replacing the Door Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Accessing Electronics Compartment . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Replace a Cooling Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-5
Replacing the Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-5
Replacing the Circulating Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . .6-6
Replacing the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
Replacing the Solid State Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-8
Replacing the Safety Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-9
Replacing the Control Thermocouple . . . . . . . . . . . . . . . . . . . . . . .6-10
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 8
Section 7

Precision Premium Oven 1-1Thermo Scientific
Section 1 Introduction
Thermo Scientific Precision 3050 Series premium ovens are available in
three sizes: small, medium and large. All ovens provide PID
Microprocessor control at operating temperatures ranging from 50°C
(122°F) to 275°C (527°F).
The forced air models provide improved temperature uniformity and
control, as well as faster drying. In these models, fresh air enters through
an air intake on the bottom of the oven, then is heated in a plenum below
the chamber. A blower circulates the heated air into the wall plenums and
the oven chamber itself in uniform flow patterns. Exhaust air is vented
through a port at the top of the oven.
Gravity flow models inlet air 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.
Temperature readouts and control parameters are shown on red LEDs.
Three additional LEDs indicate when heater power is being applied, an
error condition is encountered, or the temperature is being set.
The small ovens accommodate a maximum of five shelves. The medium
hold eight shelves, while the large each hold eleven.
Precision ovens incorporate a variety of safety features. A safety backup is
built into the controller software: 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. If primary backup heater
controls fail, an independent Over Temperature Device will disengage
heater operation.
The silicon rubber gasket supplied with the oven is good for continuous
use up to 250°C and intermittent use to 275°C. This gasket provides a
better seal than the high temperature gasket and is supplied with the unit.
An optional high temperature braided gasket is available for customers
using the oven frequently above 250°C.

1-2 Precision Premium Oven Thermo Scientific
Section 1
Introduction
The part numbers of the supplied and optional gasket are listed below:
Oven Silicon Rubber Gasket Part #
(Supplied with Oven)
Braided Gasket Part #
(High Temp Gasket Optional)
Small - 40 & 45 SPN 101908 SPN 95782
Medium 50 & 55 SPN 101909 SPN 95783
Large - 60 & 65 SPN 101910 SPN 95784

Precision Premium Oven 2-1Thermo Scientific
Section 2 Specifications
Performance Characteristics
Operating Range . . . . . . . . . . . . . . . . . . .50 to 275°
Average Uniformity @ 200°*
Forced Air Models . . . . . . . . . . . . . . . . . . . . .±3°C
Gravity Models . . . . . . . . . . . . . . . . . . . . . . .±4°C
Control Resolution . . . . . . . . . . . . . . . . . . . . . . .1°C
Control Sensitivity . . . . . . . . . . . . . . . . . . . . .±0.5°C
Recovery Time @ 200°C**
PR305045M, -40M & -40MCN . . . . . .1.0 minutes
PR305045G, -40G & -40GCN . . . . . . .2.0 minutes
PR305055M, -50M & -50MCN . . . . . .2.0 minutes
PR305055G, -50G & -50GCN . . . . . . .3.0 minutes
PR305065M, -60M & -50MCN . . . . . .2.5 minutes
PR305065G, -60G & -60GCN . . . . . . .4.0 minutes
Rise Time to 275°C
PR305045M, -40M & -40MCN . . . . . . .70 minutes
PR305045G, -40G & -40GCN . . . . . . .40 minutes
PR305055M, -50M & -50MCN . . . . . .80 minutes
PR305055G, -50G & -50GCN . . . . . . .80 minutes
PR305065M, -60M & -50MCN . . . . . .80 minutes
PR305065G, -60G & -60GCN . . . . . .100 minutes
Air Exchanges per Hour*
PR305045M, -40M & -40MCN . . . . . . . . . . . . .43
PR305045G, -40G & -40GCN . . . . . . . . . . . . . .24
PR305055M, -50M & -50MCN . . . . . . . . . . . . .29
PR305055G, -50G & -50GCN . . . . . . . . . . . . . .16
PR305065M, -60M & -50MCN . . . . . . . . . . . . .22
PR305065G, -60G & -60GCN . . . . . . . . . . . . . . .2

2-2 Precision Premium Oven Thermo Scientific
Section 2
Specifications
BTU/hr Output . . . . . . . . . . . . . . . . . . . . .@100°C @200°C
PR305045M, -40M & -40MCN . . . . . . . . . . .1125 2750
PR305045G, -40G & -40GCN . . . . . . . . . . . . .470 1325
PR305055M, -50M & -50MCN . . . . . . . . . . .1325 2925
PR305055G, -50G & -50GCN . . . . . . . . . . . .1040 2025
PR305065M, -60M & -50MCN . . . . . . . . . . .1325 3095
PR305065G, -60G & -60GCN . . . . . . . . . . . .1150 2040
*as per ASTM E145
**door open one minute
Electrical Requirements
Small - Forced Air
PR305045M . . . . . . .120 V, 11.5A, 1380W, 60 Hz
PR305040M . . . . . .240 V, 5.8A, 1392W, 50/60 Hz
PR305040MCN . . .240 V, 5.8A, 1392W, 50/60 Hz
Small - Gravity
PR305045G . . . . . . . . . .120 V, 11A, 1320W, 60Hz
PR305040G . . . . . . .240 V, 5.5A, 1320W, 50/60Hz
PR305040GCN . . . .240 V, 5.5A, 1320W, 50/60Hz
Medium - Forced Air
PR305055M . . . . . . .120 V, 15.5A, 1860W, 60 Hz
PR305050M . . . . . .240 V, 7.8A, 1870W, 50/60 Hz
PR305050MCN . . .240 V, 7.8A, 1870W, 50/60 Hz
Medium - Gravity
PR305055G . . . . . . . . . .120 V, 15A, 1800W, 60Hz
PR305050G . . . . . . .240 V 7.5A, 1800W, 50/60Hz
PR305050GCN . . . .240 V 7.5A, 1800W, 50/60Hz
Large - Forced Air
PR305065M . . . . . . .120 V, 15.5A, 1860W, 60 Hz
PR305060M . . . . . .240 V, 7.8A, 1872W, 50/60 Hz
PR305060MCN . . .240 V, 7.8A, 1872W, 50/60 Hz

Precision Premium Oven 2-3Thermo Scientific
Section 2
Section title
Electrical requirements (continued)
Large - gravity
PR305065G . . . . . . . . . .120 V, 15A, 1800W, 60Hz
PR305060G . . . . . . .240 V, 7.5A, 1800W, 50/60Hz
PR305060GCN . . . .240 V, 7.5A, 1800W, 50/60Hz
Chamber Volumes
Small . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.5 cu ft
Medium . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.8 cu ft
Large . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.0 cu ft
Chamber Dimensions (W x D x H)
Small . . . . . . . . . . . . . . . . . . . . . . . 18 x 18 x 13.5 in
Medium . . . . . . . . . . . . . . . . . . . . . . 18 x 18 x 20 in
Large . . . . . . . . . . . . . . . . . . . . . . . 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% RH

Precision Premium Oven 3-1Thermo Scientific
Section 3 Installation
The oven requires an area approximately 2 ft. x 2 ft. The bench selected
must be capable of supporting at least 120 lbs. for the small ovens, 130 lbs.
for medium ovens, or 135 lbs. for the large. Proper electrical power must
be available. Locate the oven such that no extension cord is required. The
oven shall have a 2” air clearance on all sides (6” if combustible materials)
and a minimum of 24” air clearance on top to allow heat dissipation and
prevent temperature build ups.
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 distributor. In the event
of shipping damage, retain the shipping material and file a claim with the
final carrier.
Shelves
Small and medium units - one provided
Large units - two provided
Shelf Supports
Small and medium - two provided
Large - four provided
Note If the equipment is used in a manner not specified by the
manufacturer, protection provided by the equipment may be impaired. s
Unpacking

3-2 Precision Premium Oven Thermo Scientific
Section 3
Installation
Preparing the Oven To prepare the oven for operation, perform the following procedures:
1. Install the shelf.
2. Make certain 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 or
calibrations are required. Depending on the customer application and
customer laboratory procedures an initial calibration may be done at
this point. (See Display Offsets).
The 3050 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 in the Off position,
then return it to the On position.
Caution See dataplate on oven for voltage, current and line frequency
specifications. Check that the power requirements of the oven will not
overload the circuit to which it will be connected. s
Power Switch

Precision Premium Oven 4-1Thermo Scientific
Section 4 Controls
The following sections briefly describe the locations and functions of
various display fields and keypad controls. More detailed descriptions are
provided, when required, in the operating sections of the manual.
The 3050 Series controller features a bright, one-half inch LED numeric
display which reads out the oven temperature. Three smaller LEDs
indicate, respectively, an alarm condition, that power is being applied to
the oven heaters or that the control temperature is being set. Each display
field is discussed separately below.
Temperature Display
In the normal operating mode, shows the current oven temperature.
During programming, indicates the oven set temperature target.
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.
Program Indicator
Lights when the control temperature is being set.
Display
Figure 4-1. Display Fields

4-2 Precision Premium Oven Thermo Scientific
Section 4
Controls
The 3050 Series incorporates a four-key, tactile keypad. Refer to Figure 4-
1 on the previous page. The function of each key is discussed individually
below.
• Pressing MENU while holding down the SET key decreases the oven
set temperature, as indicated on the temperature display.
• Pressing INCREASE arrow while holding down the SET key increases
the oven set temperature, as indicated on the temperature display.
• Pressing DECREASE arrow while holding down the SET key decreases
the oven set temperature, as indicated on the temperature display.
• Pressing SET causes the display to show the set temperature. Used with
INCREASE and DECREASE arrows to change the set temperature.
With MENU to access entry of a temperature display offset.
Keypad

Precision Premium Oven 5-1Thermo Scientific
Section 5 Operation
The 3050 Series ovens maintain a set temperature until that set
temperature is changed. To set a temperature, perform the following:
1. Place the power switch in the ON position. All 8s will flash as a test of
the display.
2. Press and hold the SET.
3. Observe the set temperature in the display window.
4. To decrease the set temperature, press DECREASE while holding SET.
5. To increase the set temperature, press INCREASE while holding SET.
6. When the desired set temperature is shown, release the INCREASE or
DECREASE keys. Finally, release the SET key. The oven automatically
begins to control at the set temperature.
Note To rapidly increase or decrease the set temperature, press and hold
the appropriate arrow key. To slowly increment or decrement the set
temperature one degree at a time, press and immediately release the arrow
key. s
• 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 that may ignite such materials. Before operating
ovens, always observe the following safety precautions:
• Fumes and spillage from acidic solutions cause corrosion of the
stainless steel chamber. Care should be taken to maintain a neutral PH
at all times.
• The heater for the unit is in the bottom of the unit. Surface
temperatures at the bottom cover of the unit may be higher than set
point temperature. For example: A plastic container on the heater cover
may become hot enough to melt/burn the container at settings below
the melting point of plastic. Do not place items on the heater cover.
• Wear insulated gloves.
• Use tongs.
• Never stand in front of an open oven.
• Use safety goggles.
Safety Precautions

5-2 Precision Premium Oven Thermo Scientific
Section 5
Operation
The 3050 Series controllers feature a deviation alarm which alerts the
operator and and interrupts heater power whenever the actual oven
temperature differs from the set temperature by more than 5°C. The set
limit is built in to the controller and cannot be changed.
• If the actual temperature exceeds the alarm limit, the alarm indicator
LED will light and the display will indicate EEE.
• 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 heaters when an alarm condition occurs.
Example: First experiment samples were being soaked at 160°C.
Experiment completed and oven reset to 140°C. The oven immediately
goes in to alarm once the set point is reset to 140 from 160. The oven
will stay in alarm until the oven temperature cools down to 144.9°
(140,+5, -0.1).
The 3050 Series controllers permit the operator to select a display offset
Offsets temperature. With a display offset entered, the temperature
displayed will be the actual oven temperature (measured at the control
thermocouple) plus or minus the display offset selected. Functionally, the
offset feature permits the operator to measure and calibrate such that the
display will indicate the temperature at a specific point or zone within the
oven. To enter a display offset, carry out the following steps:
1. Press the MENU, the display will indicate CAL
2. To view the present offset value, press and hold the SET key.
3. To change the display offset, press and hold the SET key. Press
INCREASE or DECREASE until the display indicates the desired
offset.
4. Release the SET key.
5. Press MENU once to return to normal temperature control.
Limit Alarms
Display Offsets

Examples:
1. The displayed temperature is the result of algebraically adding the
actual temperature to the offset value. Thus, if an offset of -3° is being
used, a measured temperature of 50° will be displayed as 47°.
2. A test is to be performed at 150°C in the center of the oven and
temperature is critical. Place a thermometer or thermocouple
(calibrated) at the critical point and set the oven to 150°C and allow
the oven to stabilize. The calibrated thermometer reads 151°C. A
display offset of 1 is entered. The immediate display reads 151. The
oven cools to 150°C, the display reads 150 and the calibrated
thermometer reads 150.
Precision Premium Oven 5-3Thermo Scientific
Section 5
Operation
Display Offsets
(continued)