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Forma Scientific 3980 Manual

29 cubic foot reach-in
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P.O. Box 649
Marietta, Ohio 45750
USA
Model 3980/3986
29 Cubic Foot
Reach-In Incubator
Manual 7003980
Important! Read this instruction manual prior to applying power to the unit.
Failure to comply with stated installation requirements may cause poor equipment
performance, component failure, or void warranty.
Complete model number and serial number are required when consulting the
factory for any reason.
Caution! All internal adjustments and maintenance must be performed by
qualified service personnel.
October 1988

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  • Page 1 P.O. Box 649 Marietta, Ohio 45750 Model 3980/3986 29 Cubic Foot Reach-In Incubator Manual 7003980 Important! Read this instruction manual prior to applying power to the unit. Failure to comply with stated installation requirements may cause poor equipment performance, component failure, or void warranty.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SECTION 1 - RECEIVING 1.1 Preliminary Inspection 1.2 Visible Loss or Damage 1.3 Concealed Loss or Damage 1.4 Responsibility for Shipping Damage SECTION 2 - AUXILIARY EQUIPMENT 2.1 Shelves 2.2 Recorder 2.3 CH/P Portamatic CO2 Control System 2.4 Solid Faced Door 2.5 Digital Thermometer 2.6 Duplex Outlet...
  • Page 3 SECTION 5 - CONTROL & INDICATING DEVICES 5.1 Main Power Switch and Indicating Light 5.2 Refrigeration Switch and Indicating Light 5.3 Defrost Switch and Indicating Light 5.4 Digital Temperature Controller 5.5 Overtemp Safety Thermostat and Alarm 5.6 Humidity Controller 5.7 Humidity Range Selector 5.8 Humidity Switch and Indicating Light 5.9 Relative Humidity Indicator 5.10 Dehumidity Switch and Indicating Light...

  • Page 4: Section 1 - Receiving

    On F.O.B. Destination shipments, Forma Scientific's and the carrier's responsibility ends when your Receiving Department personnel sign a free and clear delivery receipt. Whenever possible, Forma Scientific, Inc. will assist in settling claims for loss or in-transit damage.

  • Page 5: Section 2 - Auxiliary Equipment

    SECTION 2 - AUXILIARY EQUIPMENT 2.1 SHELVES Additional shelves are available from stock. They are stainless steel, non-perforated, and have a raised edge. The shelves slide easily into channel brackets and can be quickly removed for easy cleaning. Catalog No. 505071 2.2 RECORDER Recorders maintain a permanent, accurate record of chamber humidity and/or temperature.

  • Page 6: Digital Thermometer

    2.5 DIGITAL THERMOMETER This panel mounted thermometer provides direct digital temperature display in 0.1°C increments. Catalog No. 260154 2.6 DUPLEX OUTLET Weather-proof, mounted inside the incubator chamber. 115V - Catalog No. 505099 220V - Catalog No. 505094 2.7 THRU-WALL ACCESS PORT 1-3/4"...

  • Page 7: Section 3 - Specifications

    SECTION 3 - SPECIFICATIONS 3.1 CONSTRUCTION Exterior: Reinforced Steel Interior: Polished Stainless Steel Shelves: (6) Non-Perforated, Stainless Steel Finish: Polyurethane Enamel 3.2 DIMENSIONS Exterior: 88-1/2"H x 38"W x 31"D 225cmH x 97cmW x 87cmD Interior: 60"H x 31"W x 27"D 153cmH x 79cmW x 69cmD 3.3 CAPACITY AND WEIGHT Capacity: 29 Cubic Feet...

  • Page 8: Electrical Requirements

    SECTION 3 – SPECIFICATIONS (continued) 3.7 ELECTRICAL REQUIREMENTS Model 3980: 220V, 3 Wire, 17 FLA, 60 Hz Model 3986: 220/240V, 2 Wire, 23 FLA, 50 Hz 3.8 UTILITY CONNECTIONS 3/8" NPT Drain Connection 1/8" NPT Water Connection 1/4" Compression Fitting for CO...

  • Page 9: Section 4 - Installation

    A 3/8" NPT drain connection is required on the Model 3980. A drain trap is necessary on the drain line to maintain precise CO control within the chamber.

  • Page 10: Preparation Of Humidification System

    Connecting two tanks will help to insure continuous availability of CO . A suitable two- stage pressure regulator is available from Forma Scientific, Inc. The CO pressure must be between 5 and 10 PSIG. Pressure higher than 10 PSI will damage the control system.
  • Page 11 SECTION 4 – INSTALLATION (continued) To connect the CO supply: 1) Slip the copper tubing provided with the unit, or a copper CO supply tubing, as far as it will go into the nut of the CO connection. 2) Turn the nut until it is finger tight. 3) For reference, scribe the nut at the 6:00 position.

  • Page 12: Section 5 - Control & Indicating Devices

    SECTION 5 - CONTROL & INDICATING DEVICES 5.1 MAIN POWER SWITCH AND INDICATING LIGHT The main power switch controls the ON/OFF power to the incubator systems. The indicating light is energized when the main power switch is ON, and the unit is receiving power. 5.2 REFRIGERATION SWITCH &...

  • Page 13: Digital Temperature Controller

    5.4 DIGITAL TEMPERATURE CONTROLLER The solid state digital thumbwheel switch controls power to the incubator heater circuit. On a demand for heat, the temperature controller energizes the heaters to bring the temperature up to setpoint. On the controller face, there are three manually adjustable rotary discs for direct dialing of the chamber setpoint temperature.

  • Page 14: Humidity Range Selector

    5.7 HUMIDITY RANGE SELECTOR The humidity range selector is used to select the proper humidity range: Low Range: 10% to 50% RH High Range: 40% to 100% RH The range is set by pushing the switch to the LEFT for high range RH or to the RIGHT for low range RH.

  • Page 15: Purge Level Dial

    5.12 PURGE LEVEL DIAL The purge level dial is used to set the duration of the CO purges. For example, when the dial is set at 5%, the incubator will be purged with CO for approximately 108 seconds. This is enough to replace 5% of the air in the incubator with CO The dial is marked for 5%, 10%, and 15%.

  • Page 16: Blower Switch

    5.17 BLOWER SWITCH A two speed blower switch has been added to the unit to facilitate air flow in the incubator chamber to reduce the possibility of culture desiccation. The switch is located behind the control panel, either on the right side of the control panel housing or on the right side of the component mount on the back of the hinged panel.

  • Page 17: Section 6 - Operation

    SECTION 6 - OPERATION 6.1 POWER CONNECTION Connect the unit to an adequate power source: Model 3980: 220 Volts, 3 Wire, 17 FLA, 60 Hz. Model 3986: 220/240 Volts, 2 Wire, 16-23 FLA, 50 Hz. 6.2 INITIAL SETTINGS Main Power Switch..........OFF Temperature Controller......Desired Setpoint...

  • Page 18: Setting The Overtemp Safety Thermostat

    SECTION 6 – OPERATION (continued) 6.4 SETTING THE OVERTEMP SAFETY THERMOSTAT Once the chamber temperature has stabilized, the overtemp thermostat should be set as follows: 1) Turn the overtemp control knob slowly counterclockwise until the audible alarm sounds and the overtemp indicating light is energized. 2) Turn the control knob clockwise approximately two increments on the arbitrary scale.

  • Page 19: Co2 System Operation

    When operating a dry incubator, as opposed to a humidified one, ambient humidity fluctuations will affect CO calibrations. Since the fluctuations possible in extreme ambient changes have less effect on the total absolute humidity, the CO calibration can be affected by as much as 1.5%. When a change in humidity or temperature is needed, the CO control can be easily zeroed for the new condition.

  • Page 20: Section 7 - General Maintenance

    Information about disinfectants recommended by Forma Scientific, Inc. is included as a supplement to this manual. The cabinet exterior may be cleaned with soap and water or a non-abrasive commercial spray cleaner.

  • Page 25: Section 8 - Servicing (For Qualified Personnel Only)

    SECTION 8 – SERVICING (For Qualified Personnel Only) CAUTION! All servicing must be performed by qualified maintenance and electrical personnel only. Always disconnect incubator from power source before beginning service procedures. 8.1 CHECKING AND RECALIBRATING THE DIGITAL TEMPERATURE CONTROLLER A periodic check of temperature calibration is recommended to insure the accuracy of the controller.

  • Page 26: Recalibrating The Dial Thermometer

    SECTION 8 – SERVICING (continued) 8.2 RECALIBRATING THE DIAL THERMOMETER NOTE: Recalibration is necessary only if the dial thermometer is not giving an accurate reading. 1) Place an accurate thermometer in the center of the incubator chamber. Allow sufficient time for the temperature reading to stabilize.

  • Page 27: Replacing The Overtemp Probe And Thermostat

    Re-tighten the setscrews. 13) If you do not have access to precision resistors, a decade box with resistors and leads may be purchased from Forma Scientific, Inc. 8.4 REPLACING THE OVERTEMP PROBE AND THERMOSTAT To replace the overtemp probe and thermostat: 1) Disconnect the unit from the power source.

  • Page 28: Replacing The Humidity Sensor

    6) Open the control panel. 7) Pull the overtemp probe up through the access hole and into the control panel. 8) Follow the wires from the probe to the thermostat mounted on the control panel. Clip the plastic ties holding the overtemp cable to the other wiring. 9) Locate the overtemp knob on the front of the control panel, and pull it off.

  • Page 29: Replacing The Recorder And Probes

    8.6 REPLACING THE RELATIVE HUMIDITY INDICATOR To replace the humidity indicator: 1) Disconnect the unit from the power source. 2) Open the control panel access door. 3) Remove the two wires on the back of the indicator. NOTE: The red wire is connected to the plus (+) terminal, and the black wire is connected to the negative (-) terminal.

  • Page 30: Removing The Top Section

    8) Pull the probe(s) carefully up through the hole. 9) Trace probe cable(s) to back of recorder. Carefully clip plastic ties holding cable(s) to other wiring. 10) Remove three screws holding recorder in place, and carefully pull recorder from control panel.
  • Page 31 PROCEDURE 1) Remove all test materials from the chamber. 2) All temperature and/or humidity sensing probes are mounted on a probe mounting bracket located inside the incubator chamber. The bracket is secured to the duct sheet on the right side of the chamber. Remove the nuts, then remove the probes from the bracket. Note the location and positioning of the probes.
  • Page 32 The top assembly can be reinstalled by reversing the above procedure. Use care, however, particularly when: • Placing and aligning the sealer gasket on the 1/2" flange on top of the incubator as the top is lowered in place. • Routing the temperature and humidity sensors and capillaries to prevent bending or kinking. •...
  • Page 33 SECTION 9 - PARTS LIST STOCK # DESCRIPTION 940235 Thermometer, 2" Dial 901900 Pump, Air, Silent Giant 505087 Boiler, 3900 Series 475510 Door, 3900 Reach-In 36 x 65 434010 Gauge, Air, 5# 290113 Light, Pilot, 5/16 Red, 115V 285660 Knob, 2-1/4 285607 Switch, Toggle 3 PDT 285606...
  • Page 34 REVISION HISTORY D. Goode - 10/18/88 Section 1, Put in new Receiving section Section 2.3, Fixed typo "each-in" incubators Section 4.2, Added distilled water specifications write-up Section 6.4 and 6.5 switched around. Added 6.5 (pulled from 7003193) entitled "Overview of Humidification and CO2" Changed Index and Title Page accordingly &...

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