Thermo Scientific 3721 Operating instructions

Model 815 (3721 and 3722)
Microprocessor Controlled Low Temperature Incubator
Operating and Maintenance Manual 3177879 Rev. H

Thermo ScientificThermo Scientific
Manual Number 3177879
H24342/IN-3866 11/08 Added specs and additional info for CSA ccs
G 24342 10/08 1900381 rear comp cvr (from 316126, 1900390 int back wall plate (from 316135) ccs
F 24609 5/08 3185173 to 130630, 3164634 to 3164636 ccs
E -- 6/05 manual number, manufacture location (36100114 [34001729)
D -- 12/04 Update for base model FFU2064DW1 (pages 18-20)
C -- 9/01 Removed dual fans, updated parts list (pages 18-20)
B -- 8/99 Update parts list for new kit #s (page 19)
A -- 6/99 Initial release
Rev ECR/ECN Date Description By
Preface
Low Temp Incubator i
Covered
Models Volume (cu. ft.) Voltage
3721 20 120
3722 20 230

Thermo Scientificii Low Temp Incubator Thermo Scientific
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. ▲
Caution All internal adjustments and maintenance must be performed by qualified service personnel. ▲
Warning If the incubator is used in the manner specified in this operating manual, the protection provided by
the equipment design may be impaired. ▲
Material in this manual is for information purposes only. The contents and the product it describes are subject to
change without notice. Thermo 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.
©1999 Thermo Scientific. All rights reserved.

Thermo Scientific Low Temp Incubator iiiThermo Scientific
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 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.thermo.com.
✔Always use the proper protective equipment (clothing, gloves, goggles, etc.)
✔Always dissipate extreme cold or heat and wear protective clothing.
✔Always follow good hygiene practices.
✔Each individual is responsible for his or her own safety.

Thermo Scientificiv Low Temp Incubator Thermo Scientific
Preface
Do You Need Information or Assistance on
Thermo Scientific Products?
If you do, please contact us 8:00 a.m. to 6:00 p.m. (Eastern Time) at:
1-740-373-4763 Direct
1-800-438-4851 Toll Free, U.S. and Canada
1-740-373-4189 FAX
http://www.thermo.com Internet Worldwide Web Home Page
Service E-Mail Address
Thermo Scientific
Controlled Environment Equipment
401 Millcreek Road, Box 649
Marietta, OH 45750
Our staff can provide information on pricing and give you quotations. We can
take your order and provide delivery information on major equipment items or make
arrangements to have your local sales representative contact you. Our products are listed on the
Internet and we can be contacted through our Internet home page.
Our staff can supply technical information about proper setup, operation or
troubleshooting of your equipment. We can fill your needs for spare or replacement parts or
provide you with on-site service. We can also provide you with a quotation on our Extended
Warranty for your Thermo Scientific products.
Whatever Thermo Scientific products you need or use, we will be happy to discuss your
applications. If you are experiencing technical problems, working together, we will help you
locate the problem and, chances are, correct it yourself...over the telephone without a service
call.
When more extensive service is necessary, we will assist you with direct factory trained
technicians or a qualified service organization for on-the-spot repair. If your service need is
covered by the warranty, we will arrange for the unit to be repaired at our expense and to your
satisfaction.
Regardless of your needs, our professional telephone technicians are available to assist you
Monday through Friday from 8:00 a.m. to 6:00 p.m. Eastern Time. Please contact us by
telephone or fax. If you wish to write, our mailing address is:
International customers, please contact your local Thermo Scientific distributor.
Sales Support
Service Support
[e-mail]

Thermo Scientific Low Temp Incubator vThermo Scientific
Preface
Warranty Notes
Information You Should Know Before Requesting Warranty Service
•Locate the model and serial numbers. A serial tag is located on the unit itself.
• For equipment service or maintenance, or with technical or special application inquiries, contact Technical
Services at 1-800-438-4851 or 1-740-373-4763 (USA and Canada). Outside the USA, contact your local
distributor.
Repairs NOT Covered Under Warranty
• Calibration of control parameters. Nominal calibrations are performed at the factory; typically ±1°C for
temperature, ±1% for gases, and ±5% for humidity. Our service personnel can provide precise calibrations as
a billable service at your location. Calibration after a warranty repair is covered under the warranty.
• Damage resulting from use of improper quality water, chemicals or cleaning agents detrimental to
equipment materials.
• Service calls for improper installation or operating instructions. Corrections to any of the following
are billable services:
1) electrical service connection
2) tubing connections
3) gas regulators
4) gas tanks
5) unit leveling
6) room ventilation
7) adverse ambient temperature fluctuations
8) any repair external to the unit
• Damage resulting from accident, alteration, misuse, abuse, fire, flood, acts of God, or improper
installation.
• Repairs to parts or systems resulting from unauthorized unit modifications.
• Any labor costs other than that specified during the parts and labor warranty period, which may
include additional warranty on CO2sensors, blower motors, water jackets, etc.

Section 4
Section 5
Section 6
Section 8
Section 7
Low Temp Incubator viThermo Scientific
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Unpacking and Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Explanation of Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Explanation of Auxiliary Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Instrumentation Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Operation and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Symptoms and Possible Causes . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Possible Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
General Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
RS232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Setting Up the Incubator for Communication . . . . . . . . . . . . . . . .6-2
Using the Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-5
Setting up the Computer for Communication . . . . . . . . . . . . . . . .6-5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2
Section 1
Section 2
Section 3

Low Temp Incubator 1-1Thermo Scientific
Section 1 Introduction
Your satisfaction and safety are important to Thermo and a complete
understanding of this unit is necessary to attain these objectives.
Warning As a routine laboratory precaution, always wear safety glasses
when working with this apparatus. ▲
This product is not intended, nor can it be used, as a sterile or patient
connected device. In addition, this apparatus is not designed for use in
Class I, II or III locations as defined by the National Electrical Code.
Save all packing material until unit is put into service. This merchandise
was carefully packed and thoroughly inspected before leaving our factory.
Responsibility for safe delivery was assumed by the carrier upon acceptance
of the shipment; therefore, claims for loss or damage sustained in transit
must be made upon the carrier by the recipient as follows:
1. Visible Loss or Damage: Note any external evidence of loss or damage
on the freight bill, or express receipt, and have it signed by the carrier's
agent. Failure to adequately describe such external evidence of loss or
damage may result in the carrier's refusing to honor your damage
claim. The form required to file such claim will be supplied by the
carrier.
2. Concealed Loss or Damage: Concealed loss or damage means loss or
damage which does not become apparent until the merchandise has
been unpacked and inspected. Should either occur, make a written
request for inspection by carrier's agent within fifteen (15) days of the
delivery date; then file a claim with the carrier since the damage is the
carrier's responsibility.
If you follow the above instructions carefully, we will guarantee our full
support of your claim to be compensated for loss or concealed damage.
Note Do not - for any reason - return this unit without first obtaining
authorization. In any correspondence to Thermo, please supply the
nameplate data, including catalog number and serial number. ▲
Unpacking and
Damage