Thermo Scientific PR305225G, PR305220G, PR305210G, PR305215G Instruction Manual

Precision Compact Gravity

Convection Ovens

LTM1879X1 • 8/4/09

Model No.
PR305215G, PR305210G, PR305210GCN
PR305225G, PR305220G, PR305220GCN

Table of Contents

Introduction ..................................................................................................................................................................3

Product Overview ..................................................................................................................................................3

Safety Information ........................................................................................................................................................4

Alert Signals ..........................................................................................................................................................4

Specifications ..............................................................................................................................................................5

Power Requirements ............................................................................................................................................5

Overall Dimensions................................................................................................................................................5

Chamber Dimensions ............................................................................................................................................5

Volume ..................................................................................................................................................................5

Shipping Weight ....................................................................................................................................................5

Performance Characteristics ................................................................................................................................5

Environmental Operating Conditions ....................................................................................................................5

Unpacking and Installation ..........................................................................................................................................6

Shipping Carton ....................................................................................................................................................6

Location ................................................................................................................................................................6

Electrical Requirements ........................................................................................................................................6

Installation..............................................................................................................................................................7

Operation......................................................................................................................................................................8

Start-Up ................................................................................................................................................................8

Maintenance ................................................................................................................................................................9

Replacement Parts ....................................................................................................................................................10

Wiring Diagrams ........................................................................................................................................................11

Ordering Procedures ..................................................................................................................................................14

Warranty ....................................................................................................................................................................16

2

Introduction

Thank you for selecting Thermo Scientific products for your
equipment needs.

Product Overview

The Thermo Scientific Precision Compact Gravity Convection
Ovens are designed for use in hospitals, industry, and school
laboratories—wherever there is a need for low-cost, yet reli­able ovens for drying, sterilization, baking, evaporation or sim­ilar type work. They are ideal for drying glassware, drying
and/or baking non-flammable crystalline chemicals, pre-heat­ing crucibles or other containers and drying filter paper strips
or rounds.

The temperature range, controlled by a bimetallic thermostat
on the front control panel, is from ambient +5ºC to 210ºC. A
sheathed heater produces the unit’s heat and a pre-set high­limit bimetallic thermostat is standard on all models. A pilot
light on the control panel indicates oven operation status.

Helping to retain chamber heat is one-inch thick insulation of
semi-refractory fibers that is sandwiched between the double
walls of the chamber. The interior walls of the chamber are
aluminum and the shelves are steel wire as is the surface
covering the heater area—all for more efficient distribution of
heat.

These ovens are built for rugged performance and long life.
Each has a durable powder coated cold rolled steel exterior.
To inhibit rust the shelves are nickel-plated steel.

3

Safety Information

These instructions contain important operating and safety

Alert Signals

Warning

Warnings alert you to a possibility of
personal injury.

Caution

Cautions alert you to a possibility of
damage to the equipment.

Note

Notes alert you to pertinent facts and
conditions.

information. The user must carefully read and understand
these instructions before using the oven.Your unit has
been designed to optimize function, reliability, safety and
ease of use. It is the user’s responsibility to install the
oven in conformance with local electrical codes.

Hot Surface

Hot surfaces alert you to a possibility of
personal injury if you come in contact
with a surface during use or for a period
of time after use.

4

Specifications

Power Requirements

odel PR305215G: 120 Volts, 50/60 Hz, 4.2 Amps, 500 Watts

M
Model PR305210G, PR305210GCN: 240 Volts, 50/60 Hz, 2.1 Amps, 500 Watts
Model PR305225G: 120 Volts, 50/60 Hz, 6.7 Amps, 800 Watts
Model PR305220G, PR305220GCN: 240 Volts, 50/60 Hz, 3.3 Amps, 800 Watts

Overall Dimensions

Models PR305215G, PR305210G, PR305210GCN: 12-1/2"W x 13-1/2"D x 18"H (32 x 34 x 46 cm)
Models PR305225G, PR305220G, PR305220GCN: 18-1/2"W x 13-1/2"D x 22-1/2"H (47 x 34 x 57 cm)

Chamber Dimensions

Models PR305215G, PR305210G, PR305210GCN: 10"W x 11-1/2"D x 11-1/2"H (25 x 29 x 29 cm)
Models PR305225G, PR305220G, PR305220GCN: 16"W x 11-1/2"D x 16-1/8"H (41 x 29 x 41 cm)

Volume

Models PR305215G, PR305210G, PR305210GCN: 0.7 cu. ft. (19.8 liters)
Models PR305225G, PR305220G, PR305220GCN: 1.7 cu. ft. (48.2 liters)

Shipping Weight

Models PR305215G, PR305210G, PR305210GCN: 35 lbs. (16 kg)
Models PR305225G, PR305220G, PR305220GCN: 57 lbs. (26 kg)

Performance Characteristics

Temperature Range All models ambient +5°C to 210°C
Uniformity at 100°C ±5.0°C
Control at 100°C ±9.0°C

Environmental Operating Conditions

Pollution Degree*: 2
Installation Category*: II
Altitude: 2000 Meters MSL (Mean Sea Level)
Humidity: 80% maximum, non-condensing
Electrical Supply: 120VAC or 240VAC
Voltage Tolerance: ±10% of normal rated line
Temperature: 15ºC to 40ºC
Product Usage: This product is intended for use indoors only

*Refer to IEC 664-1

5

Unpacking and Installation

Shipping Carton

The shipping carton should be inspected upon delivery.
When received, carefully examine for any shipping dam­age before unpacking. If damage is discovered, the deliv­ering carrier should both specify and sign for the damage
on your copy of the delivery receipt.

Open the carton carefully making certain that all parts are
accounted for before packaging materials are discarded.
After unpacking, if damage is found promptly report it to
the carrier and request a damage inspection promptly.

IMPORTANT: Failure to request an inspection of damage
within a few days after receipt of shipment absolves the
carrier from any liability for damage.You must call for a
damage inspection promptly.

Note

Leave unit disconnected when not in
use.

Location

Set the oven where it is to be operated, in an area free of
drafts and strong vibrations. Do not place on or near a
combustible surface or material.

Electrical Requirements

• Use a properly grounded electrical outlet of cor­rect voltage and current handling capacity.

• Do not remove or modify grounded power plug.
Use only properly grounded outlets to avoid
shock hazard.

6

1.75 mm

(Top of Oven)

Thermometer Vent Ring

Thermometer Holder

Thermometer Grommet

Note

If the equipment is used in a manner not
specified by the manufacturer, the protec­tion provided by the equipment may be
impared.

UNPACKING AND INSTALLATION

Installation

1. Install the shelves on the rack inside the oven.

2. Turn the power switch OFF and plug the oven
into a receptacle that provides the required volt­age as indicated on the unit’s nameplate.

3. Install an immersion thermometer (furnished by
the user) through the thermometer grommet and
into the thermometer holder.

4. Adjust the immersion depth to 175 mm (mea­sured from the bulb to the top of the rubber
washer).

5. Insert this assembly into the thermometer vent
ring that is located on top of the oven.

7

Operation

Status Lamp

Control Thermostat

Power Switch

ON

OFF

Thermometer Vent Ring

Heater Shield

Warning

Do not use in the presence of flam­mable or combustible materials or
explosive gases. Do not use in the
presence of pressurized or sealed
containers – fire or explosion may
result, causing death or severe
injury.

Warning

Do not heat any substance above a
temperature that will cause it to emit
toxic fumes; death or severe injury
may result.

Caution

It is the user’s responsibility to mon­itor oven action when setting and
maintaining operating temperature;
oven failure may occur with possi­ble property damage and/or injury
to personnel.

Control Panel

Start-Up

1. Turn the power switch ON – status lamp will light.

2. Set the control thermostat to obtain the desired tem­perature. Read the user-supplied thermometer, not
the control dial; the control dial is graduated from 0
to 10 for REFERENCE PURPOSES ONLY. It is sug­gested that a log be made of control settings vs.
thermometer readings to assist in obtaining desired
temperatures. However, it is important to bear in
mind that the applicability of such a chart will be
affected by changes in line voltage and ambient con­ditions.

3. Allow time for the oven to reach its maximum set
temperature and to stabilize.

Hot Surface

At the higher temperatures, the exte­rior of the oven and particularly the
thermometer vent ring on the top
become uncomfortably warm to the
touch. To avoid burns, do not touch

8

these surfaces.

Warning

To avoid electrical short or shock, do
not allow any metal object to pro­trude into the space beneath the
shelf that serves as the heater shield
inside the oven. In addition, do not
operate oven with the shield
removed.

Note

Make no attempt to service or repair
a Thermo Scientific product under
warranty before consulting your
Thermo Scientific dealer. After the
warranty period, such consultation is
still advised, especially when the
repair may be technically sophisticat­ed or difficult. If assistance is needed
beyond what the distributor can pro­vide, please call Customer Service at
800-553-0039. No merchandise
should be returned directly to the fac­tory without obtaining a Return
Materials Authorization (RMA) num­ber from Customer Service.

Maintenance

Because of their rugged, simple construction, these ovens
require very little maintenance. Ordinary cleaning will suf­fice. The bottom shelf that covers the heater can be
removed for easy access to the heater area.

Clean up any spills as soon as possible to prevent materi­als being baked on surfaces. When the oven is cool, use
a mild soap and water to clean surfaces. Rinse thorough­ly and dry. It is best to avoid highly abrasive cleaners that
can damage the finish of the interior surfaces and shelves.

If the oven fails to heat, there may be several possible
causes:

• Oven is not receiving electrical power.

• Heater is burned out.

• Thermostat is malfunctioning.

Warning

Disconnect from the power supply
prior to maintenance and servicing.

Have a qualified electrical technician determine the cause
of the problem and make the necessary repairs. Your local
Thermo Scientific products dealer can provide the service
and replacement parts needed.

9

Replacement Parts

DESCRIPTION PART NUMBER
Tension Catch: 600-124-00
Handle: 560-248-00
Feet: 790-225-00
Status Lamp Base: 360-233-01
Status Lamp Lens (amber): 360-235-00
Power Switch (120V): SWX143
Power Switch (240V): 440-292-00
Thermometer Grommet: 790-247-00
Thermometer Holder: 910-039-00
Control Thermostat: 920-412-00
Thermostat Knob: 560-265-00
Hi-Limit Thermostat: 920-413-00

Heaters:
PR305215G: 340-212-00
PR305225G: 340-213-00
PR305210G, PR305210GCN: 340-214-00
PR305220G, PR305220GCN: 340-215-00

Shelves Kit:
PR305215G, PR305210G, PR305210GCN: 3510-8Q
PR305225G, PR305220G, PR305220GCN: 3511-8Q

10

Wiring Diagrams

WH1480X1

WM1480X1

CR1480X1

GRN

BLK

WHT

WM1480X2

ON (I)

CONTROL THERMOSTAT

WITH SHAFT

Wiring Diagram • Models PR305215G, PR305210G, PR305225G, PR305220G

11

Ordering Procedures

Please refer to the Specification Plate for the complete
model number, serial number, and series number when

equesting service, replacement parts or in any corre-

r
spondence concerning this unit.

All parts listed herein may be ordered from the Thermo
Scientific dealer from whom you purchased this unit or
can be obtained promptly from the factory. When service
or replacement parts are needed we ask that you check
first with your dealer. If the dealer cannot handle your
request, then contact our Customer Service Department
at 563-556-2241 or 800-553-0039.

Prior to returning any materials, please contact our
Customer Service Department for a “Return Materials
Authorization” number (RMA). Material returned without
an RMA number will be refused.

12

One Year Limited Warranty

This Thermo Scientific product is warranted to be free of defects in materials and workmanship for one (1)
year from the first to occur of (i) the date the product is sold by the manufacturer or (ii) the date the product is

urchased by the original retail customer (the “Commencement Date”). Except as expressly stated above, the

p
MANUFACTURER MAKES NO OTHER WARRANTY, EXPRESSED OR IMPLIED, WITH RESPECT TO THE
PRODUCTS AND EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES, INCLUDING BUT NOT LIMITED
TO, WARRANTIES OF DESIGN, MERCHANT ABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

An authorized representative of the manufacturer must perform all warranty inspections. In the event of a
defect covered by the warranty, we shall, as our sole obligation and exclusive remedy, provide free replace­ment parts to remedy the defective product. In addition, for products sold within the continental United States
or Canada, the manufacturer shall provide free labor to repair the products with the replacement parts, but
only for a period of ninety (90) days from the Commencement Date.

The warranty provided hereunder shall be null and void and without further force or effect if there is any (i)
repair made to the product by a party other than the manufacturer or its duly authorized service representa­tive, (ii) misuse (including use inconsistent with written operating instructions for the product), mishandling,
contamination, overheating, modification or alteration of the product by any customer or third party or (iii) use
of replacement parts that are obtained from a party who is not an authorized dealer of Thermo Scientific prod­ucts.

Heating elements, because of their susceptibility to overheating and contamination, must be returned to the
factory and if, upon inspection, it is concluded that failure is due to factors other than excessive high tempera­ture or contamination, the manufacturer will provide warranty replacement. As a condition to the return of any
product, or any constituent part thereof, to the factory, it shall be sent prepaid and a prior written authorization
from the manufacturer assigning a Return Materials Number to the product or part shall be obtained.

IN NO EVENT SHALL THE MANUFACTURER BE LIABLE TO ANY PARTY FOR ANY DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OR FOR ANY DAMAGES RESULTING FROM
LOSS OF USE OR PROFITS, ANTICIPATED OR OTHERWISE, ARISING OUT OF OR IN CONNECTION
WITH THE SALE, USE OR PERFORMANCE OF ANY PRODUCTS, WHETHER SUCH CLAIM IS BASED ON
CONTRACT, TORT (INCLUDING NEGLIGENCE), ANY THEORY OF STRICT LIABILITY OR REGULATORY
ACTION.

For the name of the authorized Thermo Scientific product dealer nearest you or any additional information, contact us:

2555 Kerper Blvd., Dubuque, Iowa, 52004-0797

Phone: [phone] or 1-800-553-0039

Fax: [phone]

Web: www.thermo.com

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