Forma Scientific 3920 Betriebsanleitung

Model 3920

29 cu. ft. Capacity

Reach-In Incubator

Operating and Maintenance Manual

Manual No: 7013920 Rev. 3

Model 3920 _________________________________________________________________________________

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 war-

ranties with respect to this manual. In no event shall Thermo

Forma be held liable for any damages, direct or incidental, aris-

ing out of or related to the use of this manual.

MANUAL NUMBER 7013920

-- IN-2103 7/96 Added shipping tape removal heg

3 13426 5/95 Added p-trap to installation heg

2 12158 7/94 Updated refrigeration schematic, parts list and electrical schematic to reflect phenolic-

coated coil now standard

1 -- 4/94 Manual edited to current format

REV ECR/ECN DATE DESCRIPTION By

Model 3920 _________________________________________________________________________________

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 dissapate extreme cold or heat and waer protective clothing.

√ Always follow good hygiene practices.

√ Each individual is responsible for his or her own safety.

Do You Need Information or Assistance on Forma Scientific

Products?

do, please contact us 8:00 a.m. to 7:00 p.m. (Eastern Time) at:

1-740-373-4763 Direct

1-888-213-1790 Toll Free, U.S. and Canada

1-740-373-4189 FAX

http://www.forma.com Internet Worldwide Web Home Page

fservice@forma.com Service E-Mail Address

If you

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 Forma products.

Whatever Forma 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 7:00 p.m. Eastern Time. Please contact us by

telephone or fax. If you wish to write, our mailing address is:

Forma Scientific, Inc.

Millcreek Road, PO Box 649

Marietta, OH 45750

International customers please contact your local Forma Scientific distributor.

Sales Support

Service Support



Model 3920 _________________________________________________________________________________

iii

Model 3920 _________________________________________________________________________________

Table of Contents

Section 1 - Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1

1.1 Preliminary Inspection . . . . . . . . . . . . . . . . . . . . . . .2 - 1

1.2 Visible Loss or Damage . . . . . . . . . . . . . . . . . . . . . .2 - 1

1.3 Responsibility for Shipping Damage . . . . . . . . . . . .2 - 1

Section 2 - Installation and Start-Up . . . . . . . . . . . . . . . . .2 - 1

2.1 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1

2.2 Removing the Shipping Tape . . . . . . . . . . . . . . . . . . .2 - 1

2.3 Attaching the Drain Lines . . . . . . . . . . . . . . . . . . . . . .2 - 1

2.4 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1

2.5 Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . .2 - 1

2.6 Setting the Overtemp Safety Thermostat . . . . . . . . . .2 - 2

2.7 Setting the Undertemp Safety Thermostat . . . . . . . . .2 - 2

Section 3 - Control Panel Operation . . . . . . . . . . . . . . . . .3 - 1

3.1 The 3920 Control Panel . . . . . . . . . . . . . . . . . . . . . . .3 - 1

3.2 Temperature Controller . . . . . . . . . . . . . . . . . . . . . . . .3 - 1

Section 4 - Routine Maintenance . . . . . . . . . . . . . . . . . . .4 - 1

4.1 Cleaning the Incubator . . . . . . . . . . . . . . . . . . . . . . . .4 - 1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1

Section 5 - Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1

5.1 Access to the Electrical Components . . . . . . . . . . . . .5 - 1

5.2 Replacing the Overtemp/Undertemp Probe and

Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 1

5.3 Replacing the Optional Recorder and Probe(s) . . . . .5 - 1

5.4 Removing the Top Section . . . . . . . . . . . . . . . . . . . . .5 - 1

5.5 Calibration Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 - 3

5.6 Controller Configuration . . . . . . . . . . . . . . . . . . . . . . .5 - 4

5.7 Handling Error Codes on the Microprocessor . . . . . .5 - 7

Section 6 – Specifications . . . . . . . . . . . . . . . . . . . . . . . . .6 - 1

Section 7 - Parts List (specific for each job)

Section 8 - Schematics

2 - 1

Section 1 - Receiving

1.1 Preliminary Inspection

This item was thoroughly inspected and carefully packed

prior to shipment. All necessary precautions were taken to

ensure safe arrival of the merchandise at its destination.

Immediately upon receipt, before the unit is moved from the

receiving area, carefully examine the shipment for loss or dam-

age. Unpack the shipment and inspect both 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 2 - Installation and Start-Up

2.1 Location

Locate the unit on a firm, level surface in an area of mini-

mum ambient temperature fluctuation. A minimum of 12 inches

clearance is required at the top of the incubator and a minimum

of 3 inches clearance is required at the rear of the incubator to

facilitate adequate airflow around the refrigeration system.

2.2 Removing the Shipping Tape

Adhesive shipping tape is applied to the screws securing

the perforated duct sheet to the rear side wall of the chamber.

Remove this tape when preparing the incubator for operation.

2.3 Attaching the Drain Lines

The Chamber Drain (overflow from

the humification reservoir) is located on

the rear of the cabinet. This drain must be

trapped to prevent CO2drainage from the

chamber. A copper p-trap (Figure 2-1) is

provided with the Model 3920 and must

be installed. Attach vinyl tubing to the p-

trap and route it to an open drain.

2.4 Power Connection

The electrical junction box is located on the rear top sec-

tion of the incubator. With the junction box switch OFF, con-

nect the incubator to an adequate power source. See the electri-

cal data plate mounted on the unit for exact electrical specifica-

tions.

2.5 Start-Up Procedure

Preset the controls as follows:

Overtemp Safety Thermostat . . . . . . . . . . . .(Fully Clockwise)

Undertemp Safety Thermostat . . . . .(Fully Counterclockwise)

Main Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON

Temperature Controller . . . . . . . . . . . . . . . . . .Desired Setpoint

Refrigeration Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF

Defrost Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF

Turn the Main Power switch on. The Power and Heat indi-

cators will light. Turn the Refrigeration switch on and the indi-

cator will light.

Note: The compressor and refrigeration lights will not come on

if chamber temperature is within 4°C of temperature controller.

Model 3920__________________________________________________________________Installation and Start-Up

Figure 2-1

2.6 Setting the Overtemp Safety Thermostat

Allow the chamber temperature 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 indica-

tor lights.

2. Turn the overtemp control knob clockwise approximately

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 chamber tem-

perature rises to the overtemp control point, the alarm system

will activate, power to the heaters will shut off, and the cham-

ber 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.

2.7 Setting the Undertemp Safety Thermostat

Allow the chamber temperature 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.

Model 3920__________________________________________________________________Installation and Start-Up

2 - 2

Model 3920 __________________________________________________________________Control Panel Operation

3 - 1

Section 3 - Control Panel Operation

Figure 3-1

Model 3920 Control panel

3.1 The 3920 Control Panel

Figure 3-2

AMain 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.

BRefrigeration Switch and Indicator Light (Figure 3-2)

The refrigeration switch controls power to the refrigeration

system. The refrigeration indicator lights when the refrigeration

switch is on and the compressor is receiving power.

CDefrost Switch and Indicator Light (Figure 3-2)

The defrost switch controls power to the defrost system.

The defrost timer is factory set to provide (2) 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

defrost cycle.

The defrost switch must be turned on when the

temperature setpoint is 10°C, or below.

DOvertemp 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 cause of the problem

must be determined and corrected before normal operation

under the main temperature controller is resumed.

EUndertemp Safety Control, Indicator Light, and

Audible Alarm (Figure 3-2)

FThe 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: The undertemp 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 undertemp condition occurs, the cause of the problem

must be determined and corrected before normal operation

under the main temperature controller is resumed.

3.2 Temperature Controller (Figure 3-3)

The microprocessor-based controller controls the tempera-

ture function of the incubator.

The controller has been factory-configured with LOC 2

level of operator lock-out to operate in the AUTO mode only.

This lock-out level permits setpoint adjustment only. Use the up

and down arrow keys to set the desired temperature and humid-

ity values. Use Figure 3-3 to become familiar with the micro-

processor controller and keypad function.

Model 3920 ___________________________________________________________________Routine Maintenance

4 - 1

Figure 3-3

Microprocessor Controller

UP/DOWN Keys: When both keys are pressed simultane-

ously for 3 seconds, the Setup Menu appears displaying the

LOC parameter. Press both keys again and the Calibration

Menu appears.

UP Key: Press to increase the value by one. Press and hold

to increase the value rapidly.

DOWN Key: Press to decrease the value by one. Press and

hold to decrease the value rapidly.

AUTO/MAN Key: Press once to clear an alarm. Press the

key twice within 5 seconds and the controller toggles between

the auto and manual operation. When in Manual mode, percent

power is displayed in the lower display.

Note: Manual operation has been locked-out on this applica-

tion.

AUTO/MANUAL LED: The LED lights when the control

is in manual operation. The LED blinks to indicate that the con-

troller is toggling between auto and manual operation. After

five seconds without pressing the Auto/Manual key, the LED

stops blinking and returns to its previous state.

Section 4 - Routine Maintenance

4.1 Cleaning the Incubator

De-energize all potential sources of

energy to this unit and lockout/tagout

their controls. (O.S.H.A. Regulation,

Section 1910-147.)

The continued cleanliness of the stainless steel used in

Forma products has a direct effect on the appearance and opera-

tion 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.

Do not use chlorinated solvents on stainless steel

as they can cause rusting and pitting.

Do not use volatile or aromatic 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.

5.3 Replacing the Optional Recorder and Probe(s)

1. Open the incubator door, and locate the probe mounting

plate attached to the center of the right interior wall.

Remove the mounting plate.

2. Single pen recorders have only one long stainless steel

probe, attached to the lower end of the back of the

mounting plate. Remove the probe by carefully sliding it

out of the housing.

IMPORTANT! Use extreme care when installing the new

recorder to avoid severely bending the probe capillary tubes.

Dual pen recorders have the stainless steel probe plus a wet

bulb probe attached to the back of the mounting plate. Remove

the screws securing the mounting plate and slide the wet bulb

probe out of its housing.

3. Remove the screws securing the ceiling of the incubator

and remove the ceiling.

4. Remove the top three screws on both edges of the right

duct sheet.

5. Lean the duct sheet out in order to remove the

Permagum seal from around the probe access hole.

6. Open the control panel door, and remove any Permagum

from around the access hole.

7. Pull the probe(s) carefully up through the hole.

8. Follow the probe cable(s) to the back of the recorder,

and carefully clip any plastic ties holding the cable(s) to

other wiring.

9. Remove the three screws securing the recorder and pull

it carefully out from the front of the control panel.

10. Replace the recorder with the correct Forma part.

Note: When replacing the recorder and probe(s), retie the

probe cable(s) to the existing wires.

IMPORTANT! Use extreme care when the new recorder to

avoid severely bending the probe capillary tubes.

5.4 Removing the Top Section

If it becomes necessary to remove the top of the incubator

for moving it through low doorways, use the following proce-

dure:

• Read the instructions completely before starting the

removal process.

• Provide adequate space and sufficient lighting to perform

the work.

• Disconnect the inlet water supply and the drain.

• Before lifting the top section from the incubator, provide

carpenter’s horses or another suitable support arrangement

so that the underside of the top is suspended.

Section 5 - Service

Servicing must be performed by qualified service

personnel only!

De-energize all potential sources of

energy to this unit and lockout/tagout

their controls. (O.S.H.A. Regulation,

Section 1910-147.)

5.1 Access to the Electrical Components

To gain access to the electrical components, open the con-

trol panel and grasp the left side of the control panel housing.

Pull gently, but firmly, up and out.

5.2 Replacing the Overtemp/Undertemp Probe and

Thermostat

1. Remove the incubator ceiling by remove 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 two plastic clips that hold the probe in place

and remove the probe.

5. Open the control panel.

6. Pull the overtemp 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.

8. 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 out of the panel, and remove the

unit.

12. Replace the thermostat and probe.

Note: Reseal the probe access hole with Permagum, and retie

the overtemp cable to the existing wires after replacing the

probe.

Model 3920 _______________________________________________________________________________Service

5 - 1

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