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Thermo Forma 3940 Operating And Maintenance Manual

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

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Summary of Contents for Thermo Forma 3940

  • Page 1 Models 3940 and 3949 29 cu. ft. capacity Environmental Chamber Operating and Maintenance Manual Manual No: 7033940 Rev. 18...
  • Page 2 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.
  • Page 3 Models 3940 and 3949 ______________________________________________________________________________Safety 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.
  • Page 4 Models 3940 and 3949 _________________________________________________________________________Service...

  • Page 5: Table Of Contents

    Models 3940 and 3949 ___________________________________________________________________Table of Contents Table of Contents a. Checking the Steam Generator Safety Thermostat Calibration ....... . .5 - 3 Section 1 - Receiving .

  • Page 6: Section 1 - Receiving

    For products shipped F.O.B. Marietta, Ohio, the responsi- packed prior to shipment and all necessary precautions were bility of Thermo Forma ends when the merchandise is loaded taken to ensure its safe arrival. Immediately upon receipt, onto the carrier’s vehicle.

  • Page 7: Section 2 - Installation And Set-Up

    Models 3940 and 3949 ________________________________________________________________Installation and Set-Up The water inlet is the 1/8” FPT connection located on the Section 2 - Installation and Set-Up 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.

  • Page 8: Remote Data Output

    Note: When the chamber temperature control setpoint is For Model 3940, plug the provided 10 ft. power cord with changed, the overtemp safety thermostat must be reset to the NEMA 14-20 plug into the power outlet connection on the accommodate the change.

  • Page 9: Setting The Undertemp Safety Thermostat

    Models 3940 and 3949 ________________________________________________________________Installation and Set-Up If the battery is weak or not connected, the green LED will 2.7 Setting the Undertemp Safety Thermostat flash. If power is lost to the cabinet, the LED will also flash. When replacing the 9-volt battery, use only an alkaline style Allow the chamber temperature and humidity to stabilize, battery.

  • Page 10: Offset Calibration

    Models 3940 and 3949 ________________________________________________________________Installation and Set-Up 2.9 Offset Calibration To turn the hardware lockout back on: It may be necessary to calibrate the temperature or humidi- 1. Press the Up and Down Arrow keys simultaneously for ty controllers to match an independent temperature or humidity 3 seconds.

  • Page 11: 1900140 Ir Co Option

    Models 3940 and 3949 ________________________________________________________________Installation and Set-Up 2.12 1900140 IR CO Option c. CO Controller Calibration This section applies to units with the 1900140 IR CO If it should become necessary to calibrate the CO con- option only. troller, perform the following procedure. From the standard...
  • Page 12 Models 3940 and 3949 ________________________________________________________________Installation and Set-Up 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 Jumper switch setting:...
  • Page 13 Models 3940 and 3949 ________________________________________________________________Installation and Set-Up 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 Jumper switch setting:...
  • Page 14 Models 3940 and 3949 ________________________________________________________________Installation and Set-Up WATLOW 93 CONFIGURATION RECORD CUSTOMER: JOB NUMBER: UNT SERIAL NUMBER: CONTROL TYPE: PERPARED BY: DATE COMPLETED BY: DATE: Operational Parameters: 0.05 -5.0 Setup Parameters: 4-20 20.0 Notes: * calibration offset may vary from unit to unit Important: Input switches 1&2 must be set to "on"...
  • Page 15 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...
  • Page 16 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...
  • Page 17 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...
  • Page 18 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...

  • Page 19: Section 3 - Start Up And Operation

    Models 3940 and 3949_________________________________________________________________Start-Up and Operation Section 3 - Start Up and Operation 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: •...
  • Page 20 Models 3940 and 3949_________________________________________________________________Start-Up and Operation Audible Humidity Alarm and Indicator Display (Figure 3-3) Undertemp Safety Control, Indicator Light and Audible Alarm (Figure 3-2) The humidity alarm is a function of the humidity con- troller, Figure 3-4. When the cabinet humidity goes outside...

  • Page 21: Setting Incubator Operating Temperature

    Models 3940 and 3949_________________________________________________________________Start-Up and Operation 3.2 Setting the Incubator’s Operating Temperature a. Removing the mechanical lockout (Figure 3-5) Make sure the unit is turned The Watlow temperature off. controller’s upper numerical Wearing a grounding wrist display shows the actual temperature strap or maintaining constant con- inside the incubator chamber.

  • Page 22: Air Exchange Ventilator Caps

    Models 3940 and 3949_________________________________________________________________Start-Up and Operation Section 4 - Routine Maintenance Press the Mode key to scroll through the menus until the upper and lower displays show “2 Loc” (Figure 3-11). Press the down arrow key until the 2 becomes 0 (zero) as shown in 4.1 Cleaning the Incubator...
  • Page 23 The following is a condensed list of preventive maintenance requirements. See the specified section of the instruction manual for further details. Thermo Forma 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.
  • Page 24 Models 3940 and 3949_______________________________________________________________________________________________________Preventive Maintenance Preventive Maintenance for Model 3940/3949 Refer to Manual Section Action Daily Weekly Yearly Inspect door latch, hinges and door gasket seal Check air exchange ventilator caps for adjustment; open or close as required Perform a complete decontamination procedure. Wipe down interior, shelves, Between Experiments side panels with disinfectant.

  • Page 25: Section 5 - Service

    Models 3940 and 3949 _____________________________________________________________________________Service Section 5 - Service 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.

  • Page 26: Removing The Top Section

    Models 3940 and 3949 _____________________________________________________________________________Service Note: When raising the top section, notice the gasket seal at the 5.5 Removing the Top Section top opening of the incubator chamber. The gasket must be cor- rectly positioned when reinstalling the top on the chamber.

  • Page 27: Checking The Steam Generator Safety Thermostat Calibration

    Models 3940 and 3949 _____________________________________________________________________________Service 5.7 Cleaning and Adjusting the Humidity Steam 7. Carefully pry off the brass top of the float control reser- Generator, P/N 505087 voir. Clean and disinfect it and the connecting tube between the reservoir and the steam generator being Depending upon the quality of water used in the humidifi- careful to not damage the float assembly.

  • Page 28: Section 6 - Specifications

    Models 3940 and 3949 _____________________________________________________________________________Service Section 6 - Specifications 4. Using a clamp-on ammeter, establish that current is flowing in the blue wire going to the heater connectors. Refer to Figure 5-2. Temperature Control ±0.1°C @ +37°C (98.6°F) 5. Proper current is about 3.6 amps. If the current is not Range 0°C (32°F) to +60°C (140°F)

  • Page 29: Section 7 - Spare Parts

    Models 3940 and 3949 _________________________________________________________________________Spare Parts Section 7 - Spare Parts Humidity Part No. Description Control ±5% RH Range Above ambient to 95% 290163 RTD Temperature Sensor Sensor Bulk polymer 230066* Fuse, Ceramic 10A 350V Controller Electronic, direct set in % RH...
  • Page 30 Models 3940 and 3949 _________________________________________________________________________Spare Parts 7 - 2...
  • Page 31 Models 3940 and 3949 _________________________________________________________________________Spare Parts BACK VIEW 7 - 3...
  • Page 33 Models 3940 and 3949 __________________________________________________________________Electrical Schematics 9 - 1...
  • Page 34 Models 3940 and 3949 __________________________________________________________________Electrical Schematics 9 - 2...
  • Page 35 Models 3940 and 3949 __________________________________________________________________Electrical Schematics 9 - 3...
  • Page 36 Models 3940 and 3949 __________________________________________________________________Electrical Schematics 9 - 4...
  • Page 37 Models 3940 and 3949 __________________________________________________________________Electrical Schematics 9 - 5...
  • Page 38 Models 3940 and 3949 __________________________________________________________________Electrical Schematics 9 - 6...
  • Page 39 Models 3940 and 3949 _______________________________________________________________________________________________________Electrical Schematics 9 - 7...
  • Page 40 Models 3940 and 3949 _______________________________________________________________________________________________________Electrical Schematics 9 - 8...
  • Page 41 Models 3940 and 3949 _______________________________________________________________________________________________________Electrical Schematics 9 - 9...
  • Page 42 Thermo Forma Millcreek Road, P.O. Box 649 Marietta, Ohio 45750 U.S.A. Telephone (740) 373-4763 Telefax (740) 373-4189...

This manual is also suitable for:

3949

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