LTM1879X1 • 8/4/09

Precision Compact Gravity

Convection Ovens

Model No.

PR305215G, PR305210G, PR305210GCN

PR305225G, PR305220G, PR305220GCN
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

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Table of Contents
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.

Introduction

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4

These instructions contain important operating and safety

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.

Safety Information

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.

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.

Alert Signals
Power Requirements

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

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

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Specifications
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.

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.

Unpacking and Installation

Note

Leave unit disconnected when not in

use.

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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.

UNPACKING AND INSTALLATION

1.75 mm

(Top of Oven)

Thermometer Vent Ring

Thermometer Holder

Thermometer Grommet

7

Note

If the equipment is used in a manner not

specified by the manufacturer, the protection provided by the equipment may be

impared.
Operation

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.

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.

Status Lamp

Control Thermostat

Power Switch

ON

OFF

Control Panel

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.

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

these surfaces.

Thermometer Vent Ring

Heater Shield

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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.

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.

Warning

Disconnect from the power supply

prior to maintenance and servicing.

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.

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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

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Wiring Diagrams

WH1480X1

W

M1480X1

CR1480X1

GRN BLK

WHT

W

M1480X2

O

N (I)

C

O

NTROL THERM

OSTAT

WITH SHAFT

Wiring Diagram • Models PR305215G, PR305210G, PR305225G, PR305220G

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Ordering Procedures

Please refer to the Specification Plate for the complete

model number, serial number, and series number when

requesting service, replacement parts or in any correspondence 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.

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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

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

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: 563-556-2241 or 1-800-553-0039

Fax: 563-589-0516

Web: www.thermo.com