Electron Thermo 3920 Operating instructions

------------
Thermo
ELECTRON CORPORATION
Model: 3920
Forma Environmental Charrlber
Operating and Maintenance Manual
Manual No: 7043920
Rev. 0

EnvrrorunentalChamber __________________________________________________________________ _
Read This Instruction Manual.
Failure to read, understand and follow the instructions in
this manual may result in damage to the unit, injury to operat-
ing personnel, and poor equipment performance.
CAUTION! All internal adjustments and maintenance must
be performed by qualifiedservice personnel.
Refer to the serial tag on the back of this manual.
The material in this manual is for information purposes only. The
contents and the product it describes are subject
to change with-
out notice. Thermo Electron makes no representations or war-
ranties with respect
to this manual. In no event shall Thermo be
held liable for any damages, drrect or incidental, arising out
of or
related to the use
of this manual.
CAUTION
Contains Parts and Assemblies
Susceptible to Damage by
Electrostatic Discharge (esd)
MANUAL NUMBER 7043920
20843 10/28/03 Release 9 aks
REV
ECRlECN DATE DESCRIPTION By

Environmental Chamber __________________________________ ~'- .. ,.J
& Imporian' operating and/or maintenance Instruction,. Read the accompanying text carefuUy.
• Ce symbole attire l'attention de I'utilisateur sur des instructions importantes deJonctionnement et/ou d'entretien. II
peut etre utilise seul ou avec d'autres symboles de securite. Lire attentivement Ie texte d'accompagnement.
Wichtige
Betriebs- und/oder Wartungshinweise. Lesen Sie den nachJolgenden Text sorgfiiltig.
Importante instruccions
de operacion y/o mantenimiento. Lea el texto acompanante cuidadosamente.
& Potential ekctrictd /wzords. Only qualified persons ,houldper!",m procedures a"ocimed with tJUs symboL
'I Ce symbole attire I'attention de l'utilisateur sur des risques electriques potentiels. Seules des personnes qualifiees
doivent appliquer
les instructions et les procedures associees a ce symbole.
GeJahr von Stromschliigen. Nur qualifizierte Personen sollten die Tiitigkeiten ausJiihren, die mit diesem Symbol beze-
ichnet sind.
Potencial de riesgos electricos. Solo personas das capacitadadas deben ejecutar los procedimientos asociadas con este
simbulo.
___ " ==;:::::u;::;,:.e~:;:;:.e=::::: ::::-=~:::'::~-: 'OunltpOUT
eviter des blessures possibles.
Geriite, an denen Wartungs- oder Servicearbeiten durchgeJiihrt werden, miissen abgeschaltet und abgeschlossen wer-
den, um Verletzungen zu vermeiden.
El equipo recibiendo servicio 0 mantenimiento debe ser apagado y segurado paraprevenir danos.
A Hot ,urfacer,) present which may cause burn, to unprotected ,kin, or to materlols which may be damaged by ekvated
temperatures.
Presence
de surJace(s) chaude(s) pouvant causer des brUlures sur la peau non protegee, ou sur des matieres pouvant
etre endommagees par
des temperatures elevees.
HeijJe Oberfliiche(n) kiinnen ungeschiitzter Haut Verbrennungen zUfiigen oder Schiiden an Materialien verursachen,
die nicht hitzebestiindig sind.
Superficias calientes que pueden causar quemaduras apiel sin proteccion 0 a materiales que pueden estar danados
por elevadas temperaturas .
...J Always use the proper protective equipment (clothing, gloves, goggles, etc.)
...J Always dissipate extreme cold or heat and wear protective clothing.
...J Always follow good hygiene practices.
...J Each individual is responsible for his or her own safety.
ii

Environmental Chamber _________________________ ----'~t:a-VlI,;C
Do You Need Information or Assistance on
Thermo Electron Corporation Products?
If you do, please contact us 8:00 a.m. to 6:00 p.m. (Eastern Time) at:
1-740-373-4763 Direct
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[email protected] Service E-Mail Address
Our Sales Support staffcan provide information on pricing and give you
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equipment items
or make arrangements to have yourlocal sales representative contact
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Our products are listed on the Internet and we can be contacted through our
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Our Service Support staffcan supply technical infonnation about proper setup,
___ ~op-eration~oLtroubleshooting~oLy:ourequipment.~We-canJilLyouLneeds£orspare-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 products.
Whatever Thenno 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:
Thermo Electron Corporation
Controlled Environment Equipment
Millcreek Road,
PO Box 649
Marietta, OH 45750
International customers, please contact your local Thenno Electron distributor.
iii

Environmental Chamber _____________________________ Table of Contents
Table of Contents
Section 1 - Receiving ........................... .1 - 1 Section 4 - Routine Maintenance
................. .4 -1
1.1 Preliminary Inspection ........................ 1 - 1 4.1 Cleaning the Incubator
....................... .4 -1
1.2 Visible Loss or
Damage ....................... 1 - 1
1.3 Responsibility for Shipping Damage ............ .1 -1 Section 5 - Service
.............. ................ 5 - 1
5.1 Accessing the Electrical Components
............ .5 -1
Section 2 - Installation and Set-Up . ............... .2 -1 5.2 Replacing OverlUndertemp Probe and Thermostat .
.5 -1
2.1 Location ................................... 2 - 1 5.3 Replacing the Temperature Sensor .............. .5 -1
a. Choosing the Location ...................... 2 - 1 5.4 Programming the Temperature Controller ........ .5 -1
b. Preliminary Cleaning and Disinfecting ......... 2 - 1
a. Removing the Mechanical Lockout ........... .5 -1
c. Installing the Shelves ...................... .2 -1 b. Removing the Software Lockout .............. 5 - 2
d. Leveling the Unit .......................... 2 - 1 c. Controller Configuration
................... .5 -2
2.2 Attaching the Drain Connections
................ 2 - 1 d. Offset Calibration (TemplHumidity) ........... 5 - 2
2.3 Remote Data Output
......................... .2 -1 5.5 Replacing the Optional Recorder and Probe(s)
.... .5 -3
a. 4-20 rnA Output .......................... .2 -1 a. Calibrating the Recorder ................... .5 -4
b. Remote Alarm Contacts ..................... 2 - 1 5.6 Setting the Door Heater Control ................ .5 -4
2.4 Power Connection
............................ 2 - 2 5.7 C02 Controller Calibration .................... .5 -4
2.5 Start-Up
................................... .2 -2
2.6 Setting the Overtemp Safety Thermostat
......... .2 -2 Section 6 - Specifications ......................... 6 - 1
2.7 Setting the Undertemp Safety Thermostat ......... 2 - 2
2.8 Preparing the (Optional) CoBex Recorder
....... .2 -2 Section 7 - Spare Parts .
.......................... 7 - 1
a. Installing the Battery ...................... .2 -2
b. Changing the
Chart Paper ................... 2 - 3 Section 8 - Refrigeration Schematics ............... 8 - 1
c.-Changing-the-Een-.-.-.-
.. -.-.-.-.-.- .. - .... -... -.-.- ... - .. -.-.2----3-------.------- ... -.---.- -------.-- .. --.
2.9 Honeywell Recorder (optional) ................ .2 -3 Section 9 - Electrical Schematics .................. 9 - 1
2.10 1900140 IR
C02 Option ...................... 2 - 3
a. Connecting the C02 Source (Figure 2-4) ........ 2 - 3 Warranty Information
b. Setting the C02 Content ................... .2 - 4 Supplement
c. C02 Control and Indicators .................. .2 - 4
Section 3 - Start Up and Operation . ................ 3 -1
3.1 The Control Panel ............................ 3-1
3.2 Setting the Operating Temperature (Figure 3-4) ..... 3-2
3.3 Air Exchange Ventilator Caps ................... 3-2
3.4 Heatless Dryer PIN 1900139 (optional) ............ 3 -2
iv

Environmental Chamber ____________________________ Installation and Set-Up
Section 1 - Receiving
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Front View
Model 3920
1.1 Preliminary Inspection
This incubator was thoroughly inspected and carefully
packed prior to shipment and all necessary precautions were
taken to ensure its safe arrival. Immediately upon receipt,
before the incubator is moved from the receiving area, carefully
examine the shipment for loss
or damage. Unpack the incubator
and inspect its interior and exterior for any in-transit damage.
1.2 Visible Loss or Damage
If any loss or damage is discovered, note any discrepancies
on the delivery receipt. Failure to adequately describe such evi-
dence of loss or damage may result in
the carrier refusing to
honor a damage claim. Immediately call the delivering carrier
and request that their representative perform an inspection. Do
not discard any
of the packing material and under no circum-
stances move the shipment from the receiving area.
c: ;::::::::::::::::::::::::::::
Side View
Model 3920
1.3 Responsibility for Shipping Damage
For products shipped F.O.B. Marietta, Ohio, the responsi-
bility
of Thermo Electron Corporation ends when the merchan-
dise is loaded onto the carrier's vehicle.
On F.O.B. Destination shipments, Thermo
and the carrier's
responsibility ends when your Receiving Department personnel
sign a free and clear delivery receipt.
Whenever possible, Thermo will assist
in settling claims
for loss or in-transit damage.
1- 1

Environmental Chamber _____________________________ .Installation and Set-Up
Section 2 - Installation and Set-Up
2.1 Location
a. Choosing the Location
Locate the unit on a firm, level surface in an area of mini-
mum ambient temperature fluctuation. A minimum of twelve
(12) inches of clearance is required at the top of the incubator
and a minimum of twelve (12) inches of clearance is required at
the rear of the incubator. This space is necessary to allow ade-
quate air flow around the refrigeration system.
b. Preliminary Cleaning and Disinfecting
Disinfect all interior surfaces with a general-use laboratory
disinfectant. Rinse thoroughly with sterile distilled water, then
70% ethanol. Dry with a sterile cloth as needed.
Disinfect the shelf channels and shelves, then rinse with
distilled water before installing.
Before using any cleaning or decontamination
method except those recommended by the
manu-
facturer, users should check with the manufactur-
er that the proposed method will not damage the
equipment.
Am Accidental spills of hazardous materials on or
• inside this unit are the responsibility
of the user.
c. Installing the Shelves
The shelves may be installed at any level in the incubator.
Install a shelfchannel on each side. With the tabs pointing up,
attach the channel by
locating the rivet into a
slotted hole, far end flrst.
Pull the channel toward
the front and slide the
front rivet on the channel
into the slotted hole and
press down. Make sure
that the channels are
opposite each other so that
the installed shelf wiII be
Figure 2-1
level.
d. Leveling the Unit
Place a bubble-type level on a shelf inside the incubator.
Adjust the feet as needed; counterclockwise to lengthen or
clockwise to shorten. Level the unit front-to-back and left-to-
right.
2.2 Attaching the Drain Connections
The cabinet's 3/8" MPT drain line connection is located on
the rear (lower left side) of the cabinet. A P-trap (Figure 2-2) is
included with the unit and must be installed on the connection.
To install the drain connection, push a piece of 3/8" ID tub-
ing onto the trap and direct the tubing to a convenient drain.
Install a hose clamp on the tubing, if desired.
2.3 Remote Data Output
a. 4-20 Milliamp Output
The environmental chamber is equipped with 4-20 rnAout-
put for the remote transmission of temperature data. A terminal
strip is located on the back of the incubator for convenience.
Refer to Figure 2-3 for terminal pin identiflcation.
b. Remote Alarm Contacts
Remote alarm connections are also included on the termi-
nal strip (Figure 2-2) providing Normally Open (N.O.) and
Normally Closed (N.C.) contacts. C
is the Common terminal.
The remote alarm will activate when either the incubator's tem-
perature or humidity go out of the set alarm limits.
2 3 4 5 6 7 8 9
10
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N N x: z Z
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TEMPERA TURE
REMOTE ALARM
4-20 MA
30V lA MAX.
(-20 TO BOC)
Terninol Strip
Connection
Figure 2-2
2 - 1

Environmental Chamber ___________________________ Installation and Set-Up
2.4 Power Connection
See the serial tag on the side of the unit for electrical speci-
fications,
or refer to the electrical schematics at the end of this
manual.
Connect the incubator to a grounded, dedicated
circuit. The powercord connector is
the mains dis·
connect device for the incubator. Position the
incubator so the unitcan be easily disconnected.
For Model 3920, plug the provided 10 ft. power cord with
the NEMA 5-20P plug into the grounded dedicated electrical cir-
cuit.
2.5 Start·Up
Preset the controls as follows:
Overtemp Safety Thermostat
............. Fully Clockwise
Undertemp Safety Thermostat
...... Fully Counterclockwise
Main Power Switch
............................... ON
Temperature Controller
.................. Desired Setpoint
Door Heater
......................... .40% (factory set)
Turn the Main Power switch on. The Power indicator and
Heat indicator will light. Turn the Refrigeration switch on and
the indicator will light.
&The compressor tmd rejrigeralion lights will not
, come on if the chamber temperature is within
• +4°C o/the temperature controller.
& The defrost switch must be turned on when the
I temperature setpoint is 10°C, or below.
IMPORTANT USER INFORMATION
Caution! Stored product should be
protected
by an activated alarm system
capable
of initiating atimely response
24 hours/day. Alarms provide interconnect
for centralized monitoring.
2.6 Setting the Overtemp Safety Thermostat
Allow the chamber temperature and humidity to stabilize
then set the overtemp safety thermostat
as follows:
1. Turn the overtemp control knob slowly counterclockwise
until the audible alarm sounds and the overtemp indicator
lights.
2. Turn the overtemp control knob clockwise at least 2
degrees.
The alarm should be silenced and the overtemp
2-2
indicator light should go out. The overtemp safety ther-
mostat is now set a few degrees above the control tem-
perature setpoint. When the chamber temperature rises to
the overtemp control point, the alarm system will acti-
vate, power to the heaters will shut off, and the chamber
temperature will be maintained at the overtemp control
point.
When an overtemp condition occurs, the cause must be
determined and corrected before normal operation under the
main temperature controller can be resumed.
Note: When the chamber temperature control setpoint is
changed, the overtemp safety thermostat must be reset to accom-
modate the change.
Note: The overtemp control is not directly calibrated. The num-
bers on the dial are for reference only.
2.7 Setting the Undertemp Safety Thermostat
Allow the chamber temperature and humidity to stabilize,
then set the undertemp safety thermostat as follows:
1. Tum the undertemp control knob slowly clockwise until
the audible alarm sounds and the undertemp indicator
lights.
2. Tum the undertemp control knob counterclockwise at
least 2 degrees
on the scale. The alarm should be silenced
and the undertemp indicator light should go out.
The undertemp safety thermostat is now set a few degrees
below the control temperature setpoint. When the chamber tem-
perature drops to the undertemp control point, the alarm system
will activate, power to the compressor will shut off, and the
chamber temperature will
be maintained at the undertemp con-
trol point.
When an undertemp condition occurs, the cause must be
determined and corrected before normal operation under the
main temperature controller can be resumed.
Note: When the chamber temperature control setpoint is
changed, the undertemp safety thermostat must
be reset to
accommodate the change.
Note; The undertemp control is not directly calibrated. The num-
bers on the dial are for reference only.
2.8 Preparing the (Optional) CoBex Recorder
a. Installing the Battery
The seven-day circular chart recorder is located on the front
of the incubator cabinet and is protected by a glass door.
To prepare the recorder for operation, open the glass door
and snap the connector onto the 9-volt battery (Figure 2-4).
If
the unit is operating, the green LED lights steady. If the unit is
not turned on, the LED blinks.

Environmental Chamber ____________________________ Installation and Set-Up
time line
groove
Figure 2-3
If the battery is weak or not connected, the
green LED will flash. Ifpower is lost to the cabinet, the LED
will
also flash. When replacing the 9-volt battery, use only an
alkaline style battery. Dispose ofthe old battery following
established environmental practices.
b. Changing the Chart Paper
1. Press the Change Chart button (#3) and hold it for 1sec-
ond until the pen begins to move to the left of the chart.
See Figure 2-3.
2. Remove the existing chart by unscrewing the center
knob securing it.
3. Install the new chart, positioning it so that the correct
time line coincides with the time line groove on the
chart plate.
4. Replace the center knob and screw it tightly against the
chart.
c. Changing the Pen
1. Using a small flat blade screwdriver, loosen the 2 screws
holding the
pen arm and remove the pen and arm as an
assembly.
2. Unsnap the plastic hinge securing the pen. Remove and
discard the old pen.
3. Install the new pen by snapping the hinge securely
around the
pen arm.
4. Re-install the pen assembly by sliding the pen arm under
the screws, positioning the pen tip in the time line
groove. Tighten the
screws.
5. Push the Chart Change button and hold it for 1 second
until the pen begins to move back onto the chart.
Note:
Make sure that the pen is marking on the chart. It may
be necessary
to gently lift the pen onto the chart paper.
2.9 Honeywell Recorder (optional)
The Honeywell, DR 4500 Recorder is a one to four-chan-
nel microprocessor-based, circular chart recorder.
The recorder
is capable ofrecording both temperature and
humidity and printing alphanumeric chart data on blank heat-
sensitive chart. Refer to the Honeywell Configuration Record at
the end ofSection 5 and the supplemental Honeywell Recorder
manual.
2.10 IR C02 Option
This section applies to units with the IR C02 option only.
a. Connecting the C02 Source (Figure 2-5)
For the most economical
C02 inlet
use, the liquid C02 supply
tanks should be without
siphon tubes,
so that only C02
gas enters
the incubator injec-
tion system.
Two tanks may
be joined together with a man-
ifold to ensure a continuous Figure 2-4
C02 supply.
Install a two-stage pres-
sure regulator,
with indicating gauges, at the supply cylinder
outlet. The high-pressure gauge should have an indicating range
of 0 to 2000 psig to monitor tank pressure. The low-pressure
gauge should have
an indicating range of 0 to 30 psig to moni-
tor input pressure to the incubator injection system. Asuitable
two-stage pressure regulator
is available.
The C02 source must be regulated at a pressure
level
between 5 and 10 psig. Higher pressure levels may damage the
C02 control system. The user should determine the most eco-
nomical pressure level, between 5 and 10 psig appropriate for
the desired C02 percentage in the chamber. Use only sufficient
pressure to maintain recovery time after door openings.
To connect the C02 supply:
1. Connect the C02 tubing to the 1/4" hose fitting installed
in the C02 inlet.
2. Check the tubing connection for leaks.
2-3

Environmental Chamber ___________________________ ,Installation and Set-Up
b. Setting the C02 Content
The Watlow SD C02 controller's upper display shows the
actual
C02 content inside the chamber. The lower display
shows the
C02 setpoint.
Before setting the
C02 Content, allow the chamber temper-
ature and humidity to stabilize. Do not open door during the
stabilization period.
To set the
C02 content, press the Up or Down Arrow keys
on the Watlow
SD Controller.
C. C02 Control and Indicators
• Sample Port (Figure 2-6)
The sample port is used for checking C02 percentage in the
incubator chamber by an independent test instrument (such as
with a Fyrite,
or similar C02 test instrument).
To prevent C02 loss, the sampleportmustbe capped when it
is notin use.
• C02 Alarm (Figure 2-6)
The C02 alarm is factory set to activate when the chamber
C02 content deviates from configured alarm set points (see
configuration record). When a
C02 alarm occurs, the C02
Alarm indicator on the control panel lights and the audible
alarm sounds.
The
C02 alarm high and low setpoints are established
through the Watlow SD
C02 controller (ALO, and AHI). Refer
to the Configuration Record included at the end
of Section 5.
o 0
CO, sample port
alarm
o
6
POWER
Figure 2·5
2-4

Environmental Chamber ___________________________ ---'Start-Up and Operation
Section 3 - Start Up and Oper~tion
o
B
Fame
Enwonmenlal Chamber
Figure 3-1, Environmental Chamber Control Panel
shown with optional CoBex Recorder and optional
C02 control
3.1 The Control Panel
A Main Power Switch and Indicator Light (Figure 3·2)
The main power switch controls power to the incubator.
Themain power indicator lights when the power switch is on
and the unit is receiving power.
Refrigeration Switch and Indicator Light (Figure 3·3)
B The refrigeration switch controls power to the refriger-
ation system. The refrigeration indicator lights when the
refrigeration switch is on and the compressor is receiving
power.
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3 -1
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Defrost Refrlgeralbn
Off
Cool
Under terrp
safety
o
Heat
C Defrost Switch and Indicator Light (Figure 3-3)
The defrost switch controls power to the defrost sys-
tem. Setting the defrost switch to Auto will provide two
IS-minute defrost cycles during a twenty-four hour period.
The defrost indicator lights when the defrost switch is on
and the incubator is in a defrost cycle.
&m The defrost switch must be set to Auto when the
• temperature setpoint is 10°C, or below.
D Cool Indicator (Figure 3·4)
The Cool Indicator is illuminated when the refrigera-
tion system is activated.
E Heat Indicator (Figure 3.4)
The Heat Indicator is illuminated when the heater is
activated.

Environmental Chamber ____________________________ Start-Up and Operation
F Overtemp Safety Control, Indicator Light, and Audible
Alarm (Figure 3.3)
The overtemp safety thermostat should be set slightly
above the operating temperature
of the incubator. In the event
of an overtemp condition, the overtemp safety thermostat will:
• Activate the audible alarm and the overtemp indicator
light.
• Interrupt power to the heaters and maintain the incubator's
cabinet temperature at the overtemp safety control point.
Note:
The overtemp control is not directly calibrated. The num-
bers on the dial are for reference only.
If an overtemp condition occurs, the alarm can only be
silenced by raising the overtemp safety thermostat setting.
However, the cause
of the problem must be determined and cor-
rected before normal operation under the main temperature con-
troller is resumed.
G Undertemp Safety Control, Indicator Light and
Audible Alarm (Figure 3·3)
The undertemp safety thermostat should be set slightly
lower than the operating temperature
of the incubator. In the
event
of an undertemp condition, the undertemp safety thermo-
stat will:
• Activate the audible alarm and the undertemp indicator
light.
• Interrupt power to the refrigeration system and maintain
the incubator's cabinet temperature at the undertemp safety
control point.
Note:
The undertemp control is not directly calibrated. The
numbers on the dial are for reference only.
If an undertemp condition occurs, the alarm can only be
silenced by lowering the undertemp safety thermostat setting.
However, the cause
of the problem must be determined and cor-
rected before normal operation under the main temperature con-
troller is resumed.
3.2 Setting the
Operating
Temperature (Figure
3-4)
H The Watlow tem-
perature controller's
upper numerical dis-
play shows the actual
temperature inside
the incubator chamber.
The lower display shows
the temperature setpoint.
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Figure 3·4
3 -2
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J Changing the Setpoint
To raise or lower the setpoint, press the Up or Down
Arrow. Temperatures are set
in .1°C increments.
3.3 Air Exchange Ventilator Caps
Air exchange for the incubator is regulated through the
manually adjustable intake and exhaust ventilator caps located
on the top
of the cabinet.
When viewed from the front
of the incubator, the intake
cap is on the left and the exhaust cap is on the right. The venti-
lator caps may be opened by turning counterclockwise, and
closed by turning clockwise.
For optimum performance
of the unit, the vent caps should
be closed at all times.
3.4 Heatless Dryer PIN 1900139 (optional)
The optional heatless dryer provides dehumidification for
the incubator chamber. The dehumidify switch must be turned
on for the dryer to operate. The dryer is controlled with the
humidity controller and should operate at 90 psi.
I

Environmental Chamber ______________________________ .Routine Maintenance
Section 4 - Routine Maintenance
4.1 Cleaning the Incubator
£ De-energize aU potentUd .ource. of energy to this
r; £JJ.. unit and lockoutltagout their controls. (O.S.H.A.
~ Regulation, Section 1910-147.)
The continued cleanliness of the stainless steel used in this
unit has a direct effect
on the appearance and operation of the
unit. Use the mildest cleaning procedure that will do the job
effectively. Clean the outside
of the incubator with soap and
water or with any non-abrasive commercial spray cleaner.
Clean the inside
of the chamber with alcohol and/or soap and
water. Disinfect the interior panels with a general use laboratory
disinfectant, diluted according
to the manufacturer's instruc-
tions. Rinse the surface thoroughly after each cleaning and wipe
the surfaces dry. Always rub in the direction
of the finish pol-
ish lines.
&/1\ Do not use chlorinated solvents on stainless steel
• as they can cause rusting andpitting.
Do
not use volatile oraromatic solvents for clean-
ing inside
the cabinet as their residue can contam-
inate the cabinet environment.
The Thermopane glass door may be cleaned with commer-
cial glass cleaner or with a solution of ammonia and water.
4-1

PREVENTIVE MAINT'ENANCE
Environmental Chambers
Your equipment has been thoroughly tested and calibrated before shipment. Regular preventive maintenance is important to keep your unit function-
ing properly. The operator should perform routine cleaning and maintenance on a regular basis. For maximum performance and efficiency, it is rec-
ommended that the unit
be checked and calibrated periodically by a qualified service technician.
The following is a condensed list
of preventive maintenance requirements. See the specified section of the instruction manual for further details.
Thermo Electron has qualified service technicians, using NIST traceable instruments, available in many areas. For more information on Preventive
Maintenance
or Extended Warranties, please contact us at the number below.
Cleaning and calibration adjustment intervals are dependent upon use, environmental conditions and accuracy required.
Tips for all incubators:
• Do NOT use bleach or any disinfectant that has high chloros.
• Use sterile, distilled or demineralized water.
• Avoid spraying cleaner on the
C02 sensor.
• Do not use powdered gloves for tissue cultures.

Preventive Maintenance for Environmental Chambers
Refer to Manual Section Action Daily Weekly Yearly
Inspect door latch, hinges and door gasket seal o
3.3 Check air exchange ventilator caps for adjustment; open or close as required o
4.1 Perform a complete decontamination procedure. Wipe down interior, shelves, Between Experiments
side panels with disinfectant. Rinse everything well with sterile distilled water. More frequent decontamination may be
required, depending on use
and
environmental conditions.
5.4,5.7 *Verify and document all calibrations, at the minimum. o
Clean drip pan and drain lines o
Clean refrigeration system condenser o
Verify defrost cycle for below 10°C operation o
Change filters(under normal conditions) o
*Qualified service technicians only
** Regular monitoring routines of the various levels in your unit is encouraged.

Environmental Chamber ___________________________________ Service
Section 5 - Service
fA cooru::!~~~?~pm"; ..
Susceptible to Damage by
Electrostatic Discharge (esd)
& Se"icing must be performed by qualified .. "ice
• personnel only!
~ De-energize aU potenJW1 sources of energy to thi,
o......lIfiliiI unitandlockoutltagout their controls.
5.1 Accessing the Electrical Components
To gain access to the electrical components, remove the
two screws located on the left side of the control panel with a
Phillips screwdriver. The control panel is hinged and will swing
open.
5.2 Replacing Over/Undertemp Probe and Thermostat
1. Remove the incubator top right side air dam by remov-
ing the screws holding it in place.
2. Remove the top three screws from the top of the right
duct cover.
3. Lean the duct sheet out, and remove the Permagum seal
from around the probe access hole.
4. Remove the 15" copper capillary overtemp probe by
extracting two plastic clips that hold the probe in place.
5. Open the control panel by removing the four screws
located on the top and bottom of the control panel.
I
i
I
, o D
!
i~
i i remove
SCiews
6. Pull the probe up through the access hole and into the
control panel.
7. Follow the wires from the probe to the thermostat
mounted on the control panel. Clip the plastic ties hold-
ing the overtemp cable to the existing wiring.
S. Pull the overtemp knob on the control panel off.
9. Remove the two screws that hold the overtemp assembly
to the control panel.
10. Disconnect the two wires from the back
of the thermo-
stat assembly.
11. Pull the entire assembly from the panel, and remove the
unit.
12. Replace the thermostat and probe.
Note: Reseal probe access hole with Permagum and tie-wrap
overtemp cable to existing wires after replacing probe.
5.3 Replacing the Temperature Sensor
1. Follow instructions 1-6 from Section 5.2 to locate and
remove the probe from the chamber.
2. Clip any plastic ties securing the probe wiring.
Disconnect the probe.
3. Install the replacement probe in the chamber.
4. Route the probe wire through the access hole into the
control housing.
5. Connect the probe to the appropriate controller wiring.
6. Reseal the probe access hole with Permagum and tie-
wrap the probe wire to existing wires.
5.4 Programming the Temperature Controller
The Watlow temperature controller has been set at the fac-
tory to operate the incubator within the specifications listed in
Section 6 of this manual. Reference copies of the Watlow con-
figuration records are included at the end
of this section.
To prevent tampering, mechanical and software lockouts
are employed in the system. These lockouts must only be
removed by persons skilled in configuring controller software.
&Re-programming eitherthe temperature orhumid-
, ity controllers alters the factory defaults and will
seriously alter the performance of the incubator.
This may also void the warranty. Do not reconfig-
ure the controllers withoutfirst consulting the
Technical Services Department, [phone].
a. Removing the Mechanical Lockout
Make sure the unit is turned off.
Wearing a grounding wrist strap or maintaining constant
contact with the metal cabinet, press in the four locking tabs on
the frame
of the Temperature controller. There are two tabs on
either side as shown in the front and side views in Figure 5-1.
When all tabs are unlocked, pull the controller module out of its
frame.
5-1