Thermo Forma 3940 Operating instructions

Models 3940 and 3949
29 cu. ft. capacity
Environmental Chamber
Operating and Maintenance Manual
Manual No: 7033940 Rev. 18

Models 3940 and 3949 ___________________________________________________________________________
i
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 qualified service 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 without notice. Thermo Forma makes no representations
or warranties with respect to this manual. In no event shall
Thermo Forma be held liable for any damages, direct or inciden-
tal, arising out of or related to the use of this manual.
MANUAL NUMBER 7033940
18 21173/IN-3057 11/15/02 Added ground shield to temperature and humidity probe ccs
17 20479/IN-3013 10/7/02 Added 1900140 IR CO2option as an accessory aks
16 20474/IN-3013 3/6/02 Added optional heatless dryer aks
15 20342/PIP-012 10/3/01 Revised electrical schematics aks
14 19942 6/8/01 Replaced timer 275030 with 410048 aks
13 19935 5/8/01 Updated 3940-71 drawing aks
12 IN-2858 3/13/01 Revised control panel access and revised electrical schematics aks
11 19617 12/21/00 New door (105063) - updated electrical schematics ccs
-- -- 10/11/00 Rev 7 corrections (Item J L3 Off and SIL3 ON Humidity Configs) ccs
10 19187/IN-2816 7/24/00 Added line cord standard ccs
9 18153/IN-2816 6/27/00 Revise specs and electrical schematics ccs
- 19207/IN-2827 “ “ “
8 -- 4/25/00 Quark format ccs
7 18972/IN-2791 2/29/00 Updated configs, clarified dehumidify indicator operation ccs
-- 18948/IN-2787 Updated 3940-72 & 3949-71 drawings
REV ECR/ECN DATE DESCRIPTION By

Models 3940 and 3949 ______________________________________________________________________________Safety
ii
Important operating and/or maintenance instructions. Read the accompanying text carefully.
Ce symbole attire l'attention de l'utilisateur sur des instructions importantes de fonctionnement et/ou d'entretien. Il
peut être utilisé seul ou avec d'autres symboles de sécurité. Lire attentivement le texte d'accompagnement.
Wichtige Betriebs- und/oder Wartungshinweise. Lesen Sie den nachfolgenden Text sorgfältig.
Importante instruccions de operacion y/o mantenimiento. Lea el texto acompanante cuidadosamente.
Potential electrical hazards. Only qualified persons should perform procedures associated with this symbol.
Ce symbole attire l'attention de l'utilisateur sur des risques électriques potentiels. Seules des personnes qualifiées
doivent appliquer les instructions et les procédures associées à ce symbole.
Gefahr von Stromschlägen. Nur qualifizierte Personen sollten die Tätigkeiten ausführen, die mit diesem Symbol beze-
ichnet sind.
Potencial de riesgos electricos. Solo personas das capacitadadas deben ejecutar los procedimientos asociadas con este
simbulo.
Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.
Risques potentiels liés à l'énergie. L'équipement en entretien ou en maintenance doit être éteint et mis sous clé pour
éviter des blessures possibles.
Geräte, an denen Wartungs- oder Servicearbeiten durchgeführt werden, müssen abgeschaltet und abgeschlossen wer-
den, um Verletzungen zu vermeiden.
El equipo recibiendo servicio o mantenimiento debe ser apagado y segurado para prevenir danos.
Hot surface(s) present which may cause burns to unprotected skin, or to materials which may be damaged by elevated
temperatures.
Présence de surface(s) chaude(s) pouvant causer des brûlures sur la peau non protégée, ou sur des matières pouvant
être endommagées par des températures élevées.
Heiße Oberfläche(n) können ungeschützter Haut Verbrennungen zufügen oder Schäden an Materialien verursachen,
die nicht hitzebeständig sind.
Superficias calientes que pueden causar quemaduras a piel sin proteccion o a materiales que pueden estar danados
por elevadas temperaturas.
√ 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.

Models 3940 and 3949 _________________________________________________________________________Service
iii

Models 3940 and 3949 ___________________________________________________________________Table of Contents
iv
Table of Contents
Section 1 - Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 - 1
1.1 Preliminary Inspection . . . . . . . . . . . . . . . . . . . . . . .1 - 1
1.2 Visible Loss or Damage . . . . . . . . . . . . . . . . . . . . . .1 - 1
1.3 Responsibility for Shipping Damage . . . . . . . . . . . .1 - 1
Section 2 - Installation and Set-Up . . . . . . . . . . . . . . . . .2 - 1
2.1 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1
2.2 Water (Humidity System) and Drain Connections . .2 - 1
a. Connecting Water Inlet for Humidity System . . .2 - 1
b. Alternate Water Supply for Humidity System . . .2 - 1
c. Connecting the Drain Line . . . . . . . . . . . . . . . . . .2 - 1
2.3 Remote Data Output . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 2
a. RS-232 Data Output . . . . . . . . . . . . . . . . . . . . . . .2 - 2
b. Remote Alarm Contacts . . . . . . . . . . . . . . . . . . . .2 - 2
2.4 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 2
2.5 Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 2
2.6 Setting the Overtemp Safety Thermostat . . . . . . . . .2 - 2
2.7 Setting the Undertemp Safety Thermostat . . . . . . . .2 - 2
2.8 Preparing the (Optional) CoBex Recorder . . . . . . . .2 - 3
a. Installing the Battery . . . . . . . . . . . . . . . . . . . . . . .2 - 3
b. Changing the Chart Paper . . . . . . . . . . . . . . . . . . .2 - 3
c. Changing the Pen . . . . . . . . . . . . . . . . . . . . . . . . .2 - 3
d. Calibrating the Chart Recorder . . . . . . . . . . . . . . .2 - 3
2.9 Offset Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 4
2.10 Honeywell Recorder (optional) . . . . . . . . . . . . . . . .2 - 4
2.11 Controller Configuration . . . . . . . . . . . . . . . . . . . . .2 - 4
2.12 1900140 IR CO2Option . . . . . . . . . . . . . . . . . . . . . .2 - 5
Section 3 - Start Up and Operation . . . . . . . . . . . . . . . . .3 - 1
3.1 The Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .3 - 1
3.2 Setting Incubator Operating Temperature . . . . . . . . . .3 - 3
3.3 Setting Incubator Operating Humidity . . . . . . . . . . . .3 - 3
3.4 Programming the controllers . . . . . . . . . . . . . . . . . . .3 - 3
a. Removing the Mechanical Lockout . . . . . . . . . . .3 - 3
b. Removing the Software Lockout . . . . . . . . . . . . .3 - 3
3.5 Air Exchange Ventilator Caps . . . . . . . . . . . . . . . . . .4 - 1
3.6 Heatless Dryer (optional) . . . . . . . . . . . . . . . . . . . . . . .4 - 1
Section 4 - Routine Maintenance . . . . . . . . . . . . . . . . . . .4 - 1
4.1 Cleaning the Incubator . . . . . . . . . . . . . . . . . . . . . . . .4 - 1
Section 5 - Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1
5.1 Accessing the Electrical Components . . . . . . . . . . . .5 - 1
5.2 Replacing Over/Undertemp Probe & Thermostat . . .5 - 1
5.3 Replacing the Humidity/Temperature Sensor . . . . . .5 - 1
5.4 Replacing the Optional Recorder and Probe(s) . . . .5 - 1
5.5 Removing the Top Section . . . . . . . . . . . . . . . . . . . . .5 - 2
5.6 Setting the Door Heater Control . . . . . . . . . . . . . . . . .5 - 2
5.7 Cleaning and Adjusting Humidity Steam Generator . .5 - 3
a. Checking the Steam Generator Safety Thermostat
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 3
Section 6 - Specifications . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1
Section 7 - Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . .7 - 1
Section 8 - Refrigeration Schematics . . . . . . . . . . . . . . . .8 - 1
Section 9 - Electrical Schematics . . . . . . . . . . . . . . . . . . .9 - 1

Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
1 - 1
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.
1.3 Responsibility for Shipping Damage
For products shipped F.O.B. Marietta, Ohio, the responsi-
bility of Thermo Forma ends when the merchandise is loaded
onto the carrier’s vehicle.
On F.O.B. Destination shipments, Thermo Forma and the
carrier’s responsibility ends when your Receiving Department
personnel sign a free and clear delivery receipt.
Whenever possible, Thermo Forma will assist in settling
claims for loss or in-transit damage.
Section 1 - Receiving

Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
Section 2 - Installation and Set-Up
2.1 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 three (3) 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.
2.2 Water (Humidity System) and Drain Connections
a. Connecting Water Inlet for Humidity System
Do not attempt to operate the humidity system
without filling it with water. The humidification
heater will overheat, and the overtemp safety ther-
mostat will shut the humidification system down.
The humidity reservoir will require approximately one
quart (0.946 liter) of water on the initial filling. For best opera-
tion of the incubator, sterilized distilled, demineralized or de-
ionized water should be used in the humidity reservoir. Water
purity should be in the resistance range of 50K Ohm/cm to 1M
Ohm/cm, or a conductivity range of 20.0 uS/cm to 1.0 uS/cm.
Refer to ASTM Standard D5391-93 or D4195-88 for measuring
water purity.
Distillation systems, as well as some types of reverse
osmosis water purity systems, can produce water in the quality
range specified. Tap water is not recommended as it may con-
tain chlorine, which can deteriorate the stainless steel. Tap
water may also have a high mineral content, which would pro-
duce a build-up of scale in the reservoir. High purity, ultra pure
or milli-q water is not recommended as it is an extremely
aggressive solvent and will deteriorate the stainless steel. High
purity water has a resistance of above 1M Ohm to 18M Ohm.
Even high purity water can contain bacteria and organic con-
taminants. Water should always be sterilized or treated with a
decontaminant, safe for use with stainless steel as well as safe
for the product, prior to being introduced into the humidity
reservoir.
Distilled or de-ionized water used in the humidity
reservoir must be within a water quality resistance
range of 50K Ohm/cm to 1M Ohm/cm to protect
and prolong the life of the stainless steel. Use of
water outside the specified range will decrease the
operating life of the unit and may void warranty.
The water inlet is the 1/8” FPT connection located on the
rear top left corner of the incubator. Water inlet pressure must
not exceed 40 PSI. a manual shut-off valve should be installed
between the main water supply and the incubator.
To prevent mineral buildup on heater coils and
humidity generator walls, it may be necessary to
clean the humidity generator and immersion
heaters with a non-metallic abrasive pad and
flush thoroughly every two to three months. Refer
to Section 5.7, Cleaning and Adjusting the
Humidity Steam Generator.
b. Alternate Water Supply for Humidity System
If an in-house water supply of the required purity range
(50K to 1M Ohm) is not available, an alternate water supply
method can be used. A large vented carboy (5 gal. minimum) of
water in the required purity range can be placed on top of the
unit. Connect it to the 1/8” FPT water inlet fitting, located on
the rear top left corner of the incubator.
IMPORTANT: The maximum water consumption of this incu-
bator could be as high as 2 gallons per day. When using an
alternate water supply method, it is imperative that the humidity
reservoir not be allowed to run dry, as permanent damage to the
steam generator will result.
c. Connecting the Drain Line
The cabinet’s 3/8” MPT drain line connection is located on
the rear (lower left side) of the cabinet. A P-trap (Figure 2-1) is
included with the unit and must be installed on the connection.
To install the drain connection:
1. Using Teflon pipe thread tape, tape the threads on the
cabinet drain connection.
2. Using an open end adjustable wrench, install the P-trap
onto the connection. Make sure that the trap is posi-
tioned down.
3. Push a piece of 3/8” ID tubing onto the trap and direct
the tubing to a convenient drain. Install a hose clamp on
the tubing, if desired.
Figure 2-1
Cabinet drain P-trap
2 - 1

Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
2 - 2
2.3 Remote Data Output
a. RS-232 Data Output
The Model 3940/3949 incubator is equipped with an RS-
232 Serial Communication Interface for the remote transmis-
sion of temperature and humidity data. A terminal strip is locat-
ed on the back of the incubator for convenience. Refer to
Figure 2-2 for terminal pin identification.
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.
2.4 Power Connection
See the serial tag on the side of the unit for electrical spec-
ifications, or refer to the electrical schematics at the end of this
manual.
Connect the incubator to a grounded, dedicated
circuit. The power cord connector is the mains
disconnect device for the incubator. Position the
incubator so the unit can be easily disconnected.
For Model 3940, plug the provided 10 ft. power cord with
the NEMA 14-20 plug into the power outlet connection on the
back of the cabinet, then into the grounded dedicated electrical
circuit.
For Model 3949, the electrical junction box is located on
the rear top section of the incubator. With the junction box
switch OFF, connect the incubator to an adequate power source.
2.5 Start-Up
When the humidification system is operational, the incuba-
tor may be started. Preset the controls as follows:
Overtemp Safety Thermostat . . . . . . . . . . . . . Fully Clockwise
Undertemp Safety Thermostat . . . . . . Fully Counterclockwise
Main Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON
Humidity Controller . . . . . . . . . . . . . . . . . . . .Desired Setpoint
Temperature Controller . . . . . . . . . . . . . . . . . .Desired Setpoint
Door Heater . . . . . . . . . . . . . . . . . . . . . . . . . .40% (factory set)
For best overall performance of the incubator, the refrigera-
tion switch should be turned on for most applications. When
running Low or No humidity at high temperatures, the refriger-
ation switch may be turned off.
The defrost switch must be turned on when the
temperature setpoint is 10°C, or below.
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 counterclock-
wise until the audible alarm sounds and the overtemp
indicator lights.
2. Turn the overtemp control knob clockwise approximate-
ly two units on the scale. The alarm should be silenced
and the overtemp indicator light should go out. The
overtemp safety thermostat is now set a few degrees
above the control temperature setpoint. When the cham-
ber temperature rises to the overtemp control point, the
alarm system will activate, 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
accommodate the change.
Figure 2-2

Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
2 - 3
2.7 Setting the Undertemp Safety Thermostat
Allow the chamber temperature and humidity to stabilize,
then set the undertemp safety thermostat as follows:
1. Turn the undertemp control knob slowly clockwise until
the audible alarm sounds and the undertemp indicator
lights.
2. Turn the undertemp control knob counterclockwise
approximately two units 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.
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.
Figure 2-3
To prepare the recorder for operation, open the glass door
and snap the connector onto the 9-volt battery as shown in
Figure 2-3. If the unit is operating, the green LED lights steady.
If the unit is not turned on, the LED blinks.
If the battery is weak or not connected, the green LED will
flash. If power is lost to the cabinet, the LED will also flash.
When replacing the 9-volt battery, use only an alkaline style
battery. Dispose of the old battery following established envi-
ronmental practices.
b. Changing the Chart Paper
1. Press the Change Chart button (#3) and hold it for 1 sec-
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.
d. Calibrating the Chart Recorder
Place an accurate thermometer(s)
in the chamber next to the recorder’s
probe(s). After about three minutes,
compare the thermometer with the chart
recorder. For 2 pen operations, also
compare the second thermometer.
Note: For 2 pen operations, first select
the pen you wish to calibrate. Hold
down the #1 arrow for the red (#1) pen
or the #2 arrow for the blue (#2) pen, until the light goes out.
Refer to Figure 2-4. Then adjust as necessary.
If an adjustment is necessary, press either the #1 or #2 but-
ton to move the pen left or right. The button must be held
about five seconds before the pen begins to move. Release the
button when the pen matches the thermometer.
Figure 2-4

2.9 Offset Calibration
It may be necessary to calibrate the temperature or humidi-
ty controllers to match an independent temperature or humidity
sensor. To do so, follow the next few steps.
1. Suspend an independent, calibrated sensor(s) in the cen-
ter of the interior chamber.
2. Allow approximately 30 minutes for the incubator to
stabilize.
3. Turn off the main power switch.
4. Wear a grounding wrist strap to avoid damaging any of
the electrical components.
Figure 2-5
5. Remove the 982 controller module(s) by pressing in the
four retaining tabs, two on the right side, two on the left
side. Refer to Figure 2-5. Pull the controller module out
by gently rocking it from side to side.
6. Looking at the top and right side of the controller mod-
ule, locate the red DIP switches indicated in Figure 2-6.
Use your fingernail
or a small screw-
driver, to turn off
SW 2 by moving
the white toggle
towards the front of
the module as
shown in the illus-
tration.
7. Return the con-
troller into its frame
and firmly press on
the top and bottom of the bezel until all four locking
tabs “click” into place.
8. Turn on the main power switch.
9. Press the Up and Down Arrow keys simultaneously for
3 seconds. The word “InPt” will appear in the upper dis-
play, and “set” will appear in the lower display.
10. Press the Down Arrow once, then continue to press the
Mode key until “LOC” appears in the lower display. The
upper display will show 2. Press the Down Arrow until 0
appears.
11. Press the Mode key once, then the Up Arrow once.
“InPt” will appear in the upper display, and “set” will be
in the lower display. Press the Mode key until “CAL 1”
appears in the lower display. Press the Up or Down
Arrow key to either add or subtract an offset value. This
would be the difference between the actual value shown
on the controller, and the reference sensor value.
12. Press the Display key once.
To turn the hardware lockout back on:
1. Press the Up and Down Arrow keys simultaneously for
3 seconds. The word “InPt” will appear in the upper dis-
play, and “set” will appear in the lower display.
2. Press the Down Arrow once, then continue to press the
Mode key until “LOC” appears in the lower display. The
upper display will show 0. Press the Up Arrow until 2
appears.
3. Press the Display key once.
4. Turn off the main power switch.
5. Wear a grounding wrist strap to avoid damaging any of
the electrical components.
6. Remove the 982 controller module(s) by pressing in the
four retaining tabs, two on the right side, two on the left
side. Pull the controller module out by gently rocking it
from side to side.
7. Looking at the top and right side of the controller mod-
ule, locate the red DIP switches. Use your fingernail or
a small screwdriver, to turn on SW 2 by moving the
white toggle towards the back of the module.
8. Return the controller into its frame and press firmly on
the top and bottom of the bezel until all four locking
tabs “click” into place.
9. Turn on the main power switch.
2.10 Honeywell Recorder (optional)
The Honeywell, DR 4500 Recorder is a one to four-chan-
nel microprocessor-based, circular chart recorder.
The recorder is capable of recording both temperature and
humidity and printing alphanumeric chart data on blank heat-
sensitive chart. Refer to the Honeywell Configuration at the
end of this section and the supplemental Honeywell Recorder
Manual.
2.11 Controller Configuration
The Watlow 982 Temperature and Humidity
Controllers have been configured at the factory. Copies of the
Watlow Configuration records are included on the following
pages.
The controller should not be re-configured without first con-
sulting Thermo Forma Service department at 1-888-213-1790.
Refer to Section 3 of this manual for operating instructions
for the Watlow 982 controllers. The Watlow factory manuals
are included with this manual.
Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
2 - 4
Figure 2-6

Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
2.12 1900140 IR CO2Option
This section applies to units with the 1900140 IR CO2
option only.
a. Connecting the CO2Source (Refer to Figure 2-3)
For the most economical use, the liquid CO2supply tanks
should be without siphon
tubes, so that only CO2gas
enters the incubator injection
system. Two tanks may be
joined together with a mani-
fold to ensure a continuous
CO2supply.
Install a two-stage pres-
sure regulator, with indicating
gauges, at the supply cylinder
outlet. The high-pressure
gauge should have an indicat-
ing 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 monitor input
pressure to the incubator injection system. A suitable two-stage
pressure regulator is available.
The CO2source must be regulated at a pressure level
between 5 and 10 psig. Higher pressure levels may damage the
CO2control system. The user should determine the most eco-
nomical pressure level, between 5 and 10 psig appropriate for
the desired CO2percentage in the chamber. Use only sufficient
pressure to maintain recovery time after door openings.
To connect the CO2supply:
· Insert the copper tubing provided with the unit as far as it
will go into the nut of the CO2connection.
· Turn the nut until it is finger tight.
· For reference, scribe the nut at the 6:00 position.
· While holding the fitting body steady with a wrench, tighten
the nut 1-1/4 turns until the mark is at the 9:00 position.
· Securely attach the CO2line to the open end of the copper
tubing.
· Check the tubing connection for leaks.
b. Setting the CO2 Content
The Watlow 93 CO2controller's upper display shows
the actual CO2content inside the chamber. The lower display
shows the CO2setpoint.
Before setting the CO2Content, allow the chamber tempera-
ture and humidity to stabilize. Do not open door during the sta-
bilization period.
To set the CO2content, press the up or down triangles
on the Watlow 93 Controller.
c. CO2Controller Calibration
If it should become necessary to calibrate the CO2con-
troller, perform the following procedure. From the standard
operating display (setpoint in bottom display, actual CO2reading
in the upper display):
Enter the Setup Menu by pressing the tup-arrow and
6down-arrow keys
simultaneously on the
Watlow 93 controller for
three seconds. The
lower display shows the
Lock parameter, and the
upper display shows its
current level. Press
the6down-arrow until
0 is displayed. Then,
use the Advance key to
move through the menus
until the "CAL" prompt appears.
Once at the "CAL" prompt, press thetup-arrow or 6
down-arrow to add or subtract the percentage of CO2to make
the display accurate. Press the Advance key until LOC appears.
Press the tup-arrow key to place "2" in the upper display.
Continue to press the Advance key until the setpoint display
appears.
d. CO2Control and Indicators
Sample Port (Refer to Figure 2-9)
The sample port is used for checking CO2percentage in the
incubator chamber by an independent test instrument (such as
with a Fyrite, or similar CO2test instrument).
To prevent CO2loss, the sample port must be capped when it is
not in use.
CO2Alarm (Refer to Figure 2-9)
The CO2alarm is factory set to activate when the
chamber CO2content
deviates ± 5%. When a
CO2alarm occurs, the
CO2Alarm indicator on
the control panel lights
and the audible alarm
sounds.
The CO2
alarm high and low set-
points are established
through the Watlow 93
CO2controller (ALO,
and AHI). Refer to the
configuration record
included at the end of
Section 2.
2 - 5
Figure 2-7
Figure 2-8
Figure 2-9

Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
2 - 6
3940 (WATLOW 982) CONFIGURATION RECORD
CUSTOMER:
JOB NUMBER:
UNT SERIAL NUMBER:
CONTROL TYPE: Temperature
PREPARED BY: DATE
COMPLETED BY: DATE
Switch Configuration:
Main Boards Input 1 Board Output 3 Option board
SW1 ON SW1 OFF Jumper switch setting:
SW2 ON SW2 OFF Form B
SW3 ON
Software Configuration:
Operations Menus
SYS: Ei1S NA Ent4 NA A3LO
-73.3
A4Hi NA
Ei2S NA A2LO NA A3Hi 34.0 Aut OFF
Ent3 NA A2Hi NA A4LO NA
PID: Pb1 2.0 dE1 NA
It2
NA dB 0.0
rE1 0.50 Ct1 5
rA2
0.25
It1 NA Pb2 1.0
dE2
NA
rA1 0.19 rE2 0.25
Ct2
30
PROG:See Programming Sheets if required.
Setup Menus
InPt: In1 RT.D CAL1 **
rL2
NA CAL2 NA
dEC1 NA rtd1 DIN
rH2
NA Hunt NA
rL1 -20.0 Ftr1 2 LrnL NA
rHi 80.0 In2 NA LrnH NA
OtPt: Ot1 Ht AL2 NA LAt3 nLA SIL4 NA
PrC1 NA LAt2 NA SIL3 OFF Aout NA
HyS1 0.1 SIL2 NA
Ot4
NA PrC3 NA
Ot2 CL Ot3 AL3
AL4
NA ArL NA
PrC2 NA AL3 Pr1 HyS4 NA ArH NA
HyS2 0.1 HyS3 0.1 LAt4 NA ACAL NA
gLbL: C_F C Anun OFF PtyP
ti
PStr StPt
Err nLA LoP -100
gSd
0 LOC 2 *
Ei1 NO HiP 100 POut Cont
Ei2 NA AtSP 90 IdSP NA
* LOC should be set at 0 until factory testing and calibration is complete.
** This is a calibration factor and will vary from unit to unit.
COM: bAUd 9600 dAtA 70 PrOt FULL Addr 0
IntF NA

Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
2 - 7
3940 (WATLOW 982) CONFIGURATION RECORD
CUSTOMER:
JOB NUMBER:
UNT SERIAL NUMBER:
CONTROL TYPE: Humidity
PERPARED BY: DATE:
COMPLETED BY: DATE:
Switch Configuration:
Main Boards Input 1 Board Output 3 Option board
SW1 ON SW1 ON Jumper switch setting:
SW2 ON SW2 ON Form B
SW3 ON
Software Configuration:
Operations Menus
SYS: Ei1S NA Ent4 NA A3LO 0* A4Hi NA
Ei2S NA A2LO NA A3Hi 100* Aut OFF
Ent3 NA A2Hi NA A4LO NA
*
Th
ese va
l
ues are cus
t
omer se
t
a
bl
e
t
o
th
ere a
l
arm po
i
n
t
s.
PID: Pb1 8 dE1 NA
It2
NA dB 0
rE1 0.05 Ct1 5.0
rA2
0.35
It1 NA Pb2 7
dE2
NA
rA1 0.35 rE2 0.03
Ct2
30
PROG:See Programming Sheets if required.
Setup Menus
InPt: In1 0-5 CAL1 **
rL2
NA CAL2 NA
dEC1 0 rtd1 NA
rH2
NA Hunt NA
rL1 0 Ftr1 2 LrnL NA
rHi 100 In2 NA LrnH NA
OtPt: Ot1 Ht AL2 NA LAt3
nLA
SIL4 NA
PrC1 NA LAt2 NA SIL3 ON Aout NA
HyS1 1 SIL2 NA
Ot4
NA PrC3 NA
Ot2 CL Ot3 AL3
AL4
NA ArL NA
PrC2 NA AL3 Pr1 HyS4 NA ArH NA
HyS2 1 HyS3 1 LAt4 NA ACAL NA
gLbL: C_F NA Anun ON PtyP ti PStr StPt
Err nLA LoP -100
gSd
0 LOC 2 *
Ei1 NO HiP 100 POut Cont
Ei2 NA AtSP 90 IdSP NA
* LOC should be set at 0 until factory testing and calibration is complete.
** This is a calibration factor and will vary from unit to unit.
COM: bAUd 9600 dAtA 70 PrOt FULL Addr 0
IntF NA

Models 3940 and 3949 ________________________________________________________________Installation and Set-Up
2 - 8
CUSTOMER:
JOB NUMBER:
UNT SERIAL NUMBER:
CONTROL TYPE: CO2
PERPARED BY: DAT
E
COMPLETED BY: DATE:
Operational Parameters:
Pb1 It2
rE1 rA2
It1 dE2
rA1 Ct2
dE1 ALO
Ct1 AHI
Pb2 CAL
rE2 AUt
Setup Parameters:
LOC HSA
In LAt
dEC SIL
C_F rtd
rL rP
rH rT
Ot1 PL
HSC dSP
Ot2
Notes: * calibration offset may vary from unit to unit
Important: Input switches 1&2 must be set to "on"
2.5
0.05
0
-5.0
10 5.0
*
0
2 0.1
4-20 NLA
0.0 OFF
de
WATLOW 93 CONFIGURATION RECORD
ht 100
0.1 nor
0.0 off
20.0

HONEYWELL TRULINE CONFIGURATION RECORD SHT 1 OF 4
CUSTOMER:
JOB NUMBER:
UNIT SERIAL #:
CONTROL TYPE:
PREPARED BY: DATE: / /
COMPLETED BY: DATE: / /
GROUP FUNCTION VALUE OR GROUP FUNCTION VALUE OR
PROMPT
PROMPT
SELECTION
PROMPT
PROMPT
SELECTION
TUNING1 PROP BD or CHART CHRTSPD 7 DAY
GAIN HOUR/REV
RATE MIN TIME DIV 21
RSET MIN or MINOR DIV FOUR
RESET RPM or CONTINUE NO
MAN RSET CHART NAME
CYCSEC HEADER YES
PROP BD2 or REMSW NONE
GAIN2 WAKEMIN
RATE2MIN WAKE HR
RSET2MIN or WAKE DAY
RSET2RPM
WAKE MON
CYC2SEC
TIME MINUTES (CURRENT)
TUNING2 PROP BD or HOURS (CURRENT)
GAIN DAY (CURRENT)
RATE MIN MONTH (CURRENT)
RSET MIN or YEAR (CURRENT)
RSET PRM or
DAY
(CURRENT)
MAN RSET
CYCSEC PEN1 PEN1 ENABLE
PROP BD2 or PEN1IN INPUT 1
GAIN2 CHART1HI 80
RATE2MIN CHART1LO -20
RSET2MIN or PEN1ON
RSET2RPM PEN1OFF
CYC2SEC
MAJORDIV
10
MINORDIV 10
SP RAMP1
SP RAMP
RNG1TAG
TEMP
TIME MIN
FINAL SP PEN2 PEN2 ENABLE
SP RATE PEN2IN INPUT 2
EU/HR UP CHART2HI 100
EU/HR DN CHART2LO 0
SP PROG
PEN2ON
PEN2OFF
SP RAMP2 SP RAMP MAJORDIV 10
TIME MIN MINORDIV 10
FINAL SP
RING2TAG
% RH
SP RATE
EU/HR UP PEN3 PEN3 DISABLE
EU/HR DN PEN3IN
SP PROG CHART3HI
CHART3LO
PEN3ON
PEN3OFF
MAJORDIV
MINORDIV
RING 3 TAG
HTRUCON3940.xls

HONEYWELL TRULINE CONFIGURATION RECORD
SHT 2 OF 4
GROUP FUNCTION VALUE OR GROUP FUNCTION VALUE OR
PROMPT
PROMPT
SELECTION
PROMPT
PROMPT
SELECTION
PEN4 PEN4 DISABLE INPUT4 DECIMAL
PEN4IN UNITS
CHART4HI ENGUNITS
CHART4LO IN4TYPE
PEN4ON XMITTER
PEN4OFF IN4HI
MAJORDIV IN4LO
MINORDIV CUTOFF4
RNG4TAG
INPTCOMP
FILTER4
INPUT1
DECIMAL
XXX.X
BURNOUT
UNITS DEG C
ENGUNITS TOTAL1 (Value)
IN1TYPE 100 PT RESETTOT
XMITTER TOTAL1
IN1HI 482.2 TOTALEU
IN1LO -184.4 RATE
CUTOFF SCALER
INPTCOMP
RSETABLE
FILTER1 2
BURNOUT
UP
TOTAL2
(Value)
RSETTOT
INPUT2 DECIMAL XXXX TOTAL2
UNITS EU TOTALEU
ENGUNITS RH RATE
IN2TYPE 0-5 V SCALER
XMITTER
LINEAR
RSETABLE
IN2HI 100
IN2LO 0CONTROL1 PID SETS
CUTOFF2 SW VALUE
INPTCOMP SP SOURC
FILTER2 2RATIO
BURNOUT
UP
BIAS
SP TRACK
INPUT3 DECIMAL POWER UP
UNITS SP HILIM
ENGUNITS SP LOLIM
IN3TYPE ACTION
XMITTER OUT HILIM
IN3HI OUT LOLIM
IN3LO DROPOFF
CUTOFF3 DEADBAND
INPTCOMP OUT HYST
FILTER3 FAILSAFE
BURNOUT REM SW
MAN KEY
PBorGAIN
MINorRPM
CONT1ALG
OUT1ALG
4-20 RNG
SHEDMODE
SHED SP
HTRUCON3940.xls

HONEYWELL TRULINE CONFIGURATION RECORD
SHT 3 OF 4
GROUP FUNCTION VALUE OR GROUP FUNCTION VALUE OR
PROMPT
PROMPT
SELECTION
PROMPT
PROMPT
SELECTION
CONTROL2 PID SETS ALARMS A1S1 VAL
SW VALUE A1S2 VAL
SP SOURC A1S1 TYPE NONE
RATIO A1S2 TYPE NONE
BIAS A1S1 HL
SP TRACK A1S1 EV
POWER UP A1S2 HL
SP HILIM A1S2 EV
SP LOLIM AL1 HYST 0.1
ACTION A2S1 VAL
OUT HILIM A2S2 VAL
OUT LOLIM A2S1 TYPE NONE
DROPOFF A2S2 TYPE NONE
DEADBAND A2S1 HL
OUT HYST A2S1 EV
FAILSAFE A2S2 HL
REM SW A2S2 EV
MAN KEY AL2 HYST
PBorGAIN A3S1 VAL
MINorRPM A3S2 VAL
CONT1ALG A3S1 TYPE
OUT1ALG A3S2 TYPE
4-20 RNG A3S1 HL
SHEDMODE A3S1 EV
SHED SP
A3S2 HL
A3S2 EV
OPTIONS INPUT 1 ENABLE AL3 HYST
INPUT2 ENABLE A4S1 VAL
INPUT3 DISABLE A4S2 VAL
INPUT4 DISABLE A4S1 TYPE
CONTROL1 DISABLE A4S2 TYPE
CONTROL2 DISABLE A4S1 HL
REJFREQ 60 HZ A4S1 EV
HF REJ ENABLE A4S2 HL
AUX OUT DISABLE A4S2 EV
4mA VAL AL4 HYST
20mA VAL A5S1 VAL
RELHUMID NO A5S2 VAL
ATMPRES A5S1 TYPE
DEVIATION NONE A5S2 TYPE
DEVSETPT A5S1 HL
SCROLL NONE A5S1 EV
INP ALG A5S2 HL
COEFF A5S2 EV
PV HIGH AL5 HYST
PV LOW A6S1 VAL
RATIO A A6S2 VAL
BIAS A A6S1 TYPE
RATIO B A6S2 TYPE
BIAS B A6S1 HL
RATIO C A6S1 EV
BIAS C A6S2 HL
GRANDTOT A6S2 EV
ComSTATE DISABLE AL6 HYST
ComADDR
SHEDTIME
UNITS
HTRUCON3940.xls

HONEYWELL TRULINE CONFIGURATION RECORD
SHT 4 OF 4
GROUP FUNCTION VALUE OR GROUP FUNCTION VALUE OR
PROMPT
PROMPT
SELECTION
PROMPT
PROMPT
SELECTION
EVNT MSG EVENT 1 NONE
MESSAGE 1
POSITION 1
EVENT 2 NONE
MESSAGE 2
POSITION 2
EVENT 3 NONE
MESSAGE 3
POSITION 3
EVENT 4 NONE
MESSAGE 4
POSITION 4
EVENT 5 NONE
MESSAGE 5
POSITION 5
EVENT 6 NONE
MESSAGE 6
POSITION 6
LOCKOUT PASSWORD
LOCKOUT MAX
CHANGE
ADJUST TRACE LN
GRID LN
PEN TYPE
W1/MA W3
INPUT 1 W1 RTD
INPUT 2 MA T/C
INPUT 3
INPUT 4
ALARMS 5 & 6 ____________________
INPUT JUMPERS TO BE FITTED
JUMPERS TO BE FITTED
CONTROL OUTPUT 1 & 2 __________
ALARMS 1 & 2 ____________________
ALARMS 3 & 4 ____________________
HTRUCON3940.xls

Models 3940 and 3949_________________________________________________________________Start-Up and Operation
3 -1
Section 3 - Start Up and Operation
Figure 3-1, Reach-In Incubator Control Panel
shown with optional CoBex Recorder
3.1 The Control Panel
Main Power Switch and Indicator Light (Figure 3-2)
The main power switch controls power to the incubator.
The main power indicator lights when the power switch is
on and the unit is receiving power.
Refrigeration Switch and Indicator Light (Figure 3-2)
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.
Defrost Switch and Indicator Light (Figure 3-2)
The defrost switch controls power to the defrost sys-
tem. The defrost timer is factory set to provide two 15-
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.
The defrost switch must be turned on when the
temperature setpoint is 10°C, or below.
A
B
C
Figure 3-2
Overtemp Safety Control, Indicator Light, and Audible
Alarm (Figure 3-2)
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
numbers (0 to 10) on the dial are for reference only and do not
correspond to any specific temperature.
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.

Models 3940 and 3949_________________________________________________________________Start-Up and Operation
Audible Humidity Alarm and Indicator Display (Figure 3-3)
The humidity alarm is a function of the humidity con-
troller, Figure 3-4. When the cabinet humidity goes outside
the set parameters of the controller, L3 indicator on the
controller lights, the audible alarm sounds, and the humidity
alarm indicator (Figure 3-3, Item I) on the control panel lights.
Hold/Run Key
Pressing the Hold/Run key (Figure 3-4) on the con-
troller silences the audible alarm and extinguishes the
humidity alarm indicator and the L3 indicator on the con-
troller. A3HI/A3LO flashes on the lower display until the cabi-
net humidity returns to the system setpoint.
Note: The humidity controller’s high
and low limits are set by the factory
at 100% and 0%. Therefore, the sys-
tem will go into the alarm state when
the humidity exceeds these percent-
ages by one percent. When operating
the incubator near these high or low
humidity levels, frequent alarms may
occur. This will require that the con-
troller’s high or low limit be reset to
three or four percent over the high
limit or three or four percent under
the low limit. Refer to the Watlow
User’s guide provided. Refer also to the
factory configuration records located at
the end of Section 2 of this manual.
Undertemp Safety Control, Indicator Light and Audible
Alarm (Figure 3-2)
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 thermostat 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: As with the overtemp safety control, the undertemp con-
trol is not directly calibrated. The numbers (0 to 10) on the dial
are for reference only and do not correspond to any specific
temperature.
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.
Humidify Switch and Indicator (Figure 3-3)
The humidify switch controls the
power to the humidification system cir-
cuit. The humidity indicator light will
cycle as the controller toggles between humid-
ify and dehumidify.
Dehumidify Switch and Indicator (Figure
3-3)
The dehumidify switch will enable
the refrigeration system if the refrigera-
tion switch is currently off. When con-
trolling humidity, the dehumidification switch
should be in the ON position for most appli-
cations. The dehumidification light will cycle
on and off as the humidity controller toggles between humidify
and dehumidify. The dehumidify light will be de-energized
when the system is in Defrost mode.
Humidity is removed from the cabinet by the refrigeration
evaporator coil. Moisture accumulates on the coil and is collect-
ed into the evaporator pan. The accumulated moisture is then
plumbed to the back of the cabinet, which can be emptied to a
floor drain, or an evaporative device.
E F I
J
G
Figure 3-3
H
3 -2
Figure 3-4