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Table of Contents
Related Manuals for Thermo Scientific 274F
Summary of Contents for Thermo Scientific 274F
- Page 1 Laboratory Freezers Freezer Models 274F/274FA LT1562X1 • 6/3/09...
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Page 2: Table Of Contents
Table of Contents Safety Information ..................................3 Alert Signals ..................................3 Warning ..................................3 Unpacking ....................................4 Visible Loss or Damage ..............................4 Concealed Loss or Damage............................4 Packing List ..................................4 Performance Characteristics ..............................5 Temperature Ranges ..............................5 Temperature Stability ..............................5 Electrical Requirements ..............................5 Installation ....................................6 Selecting a Location ................................6 Casters ....................................6 Leveling the Unit................................6 Shelves ....................................6... -
Page 3: Safety Information
Safety Information Your satisfaction and safety are important to us and a Alert Signals complete understanding of this unit is necessary to attain these objectives. Warning As the ultimate user of this apparatus, it is your responsi- Warnings alert you to a possibility of bility to understand its proper function and operational personal injury. -
Page 4: Unpacking
Unpacking Save all packing material if apparatus is received dam- aged. This merchandise was carefully packed and thor- oughly inspected before leaving our factory. Responsibility for its safe delivery was assumed by the carrier upon acceptance of the shipment; therefore, claims for loss or damage sustained in transit must be made upon the carrier by the recipient as follows: Visible Loss or Damage... -
Page 5: Performance Characteristics
Performance Characteristics Temperature Ranges -30°C to 0°C (-22° to 32°F) Temperature Stability ±4°C Electrical Requirements Model Number Volts (±10%) Amps 274F or 274FA 16.0... -
Page 6: Installation
Installation Selecting a Location Choose a location for the freezer that will provide at least three inches of clearance between the cabinet and any adjacent vertical surface at the sides and the rear. Appropriate electrical power must be available. Locate the freezer within six feet of the power outlet so that no extension cord is required. -
Page 7: Shelves
NSTALLATION Shelves Included are three (3) epoxy coated wire shelves per door opening. Also included are three epoxy coated filler shelves for the two and three door models. Shelf spacing is adjustable on half-inch centers with the enclosed shelf supports to suit requirements. Replacement shelves are available individually. - Page 8 NSTALLATION Insert four shelf supports into pilasters for each shelf. Shelf Support Tab Length Figure 2 Figure 3...
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Page 9: Electrical Connection
NSTALLATION Electrical Connection Caution The frequency and nominal voltage requirements for the Insufficient line voltage is often the unit are specified on the data plate, which is located on cause of compressor start-up failure, the interiors upper left side. Plug the unit into a power especially in 115V freezers. -
Page 10: Operation
Operation Begin operation by inserting the key into the key switch located on the header panel. The key switch is packed inside the envelope, which is shipped in the freezer cham- ber. Turning the key switch to the ON ( | ) position will energize the compressor and condenser fans and the dig- Warning ital controller. -
Page 11: Setting The Temperature
PERATION Setting the Temperature To change the set temperature, press and release the Menu keypad once. The display will flash SP and the Mode LED will be illuminated. The last set temperature will then be shown in the display. To change the tempera- ture, press the UP or DOWN arrow key. -
Page 12: Hold-Off Time
PERATION chamber temperature of -17°C and the system begins to control to the desired temperature of -15°C. Allow an additional 30 to 40 minutes for the freezer to again stabilize. If the display is still inaccurate, repeat the calibration offset procedure. Hold-Off Time Note Following the offset menu is the hold-off (Ho) menu. -
Page 13: Defrost System
PERATION Defrost System Caution The defrost heaters are controlled by a defrost timer. The Changes to the defrost cycle are not timer is a 24 hr. dial timer located in a galvanized box recommended and void the warranty. behind the header panel. The timer is factory set to pro- vide four defrost cycles per 24 hour period. -
Page 14: Chart Recorder Operation And Maintenance
Chart Recorder Operation and Maintenance The recorder is installed to provide air temperature read- ings inside the unit. The recorder will swing up and down Caution with the unit’s air temperature. The customer is responsi- It is important that these instructions ble for evaluating the normal swings of the unit for suit- be read before operating the instru- ability for samples stored in the unit. -
Page 15: Marking Systems: Mark-A-Matic Ii Inking System
HART ECORDER PERATION AND AINTENANCE Marking Systems: Mark-A-Matic II Inking System This type of pen consists of a self-contained ink reservoir with a porous plastic stylus, which is snapped around the outer edge of the metal pen arm. A pen cap is provided to extend the life of the ink pen dur- ing shipping or when the recording unit is not in service. -
Page 16: Pen Arm Calibration
HART ECORDER PERATION AND AINTENANCE Figure 5: Pen Arm Assembly Pen Arm Calibration When the unit is first powered on, the pen arm(s) will move off of the chart and then move back onto the chart briefly stopping at the outer most temperature graduation ring of the chart paper. -
Page 17: Temperature Recorder Calibration Check
HART ECORDER PERATION AND AINTENANCE Temperature Recorder Calibration Check This recorder has been accurately calibrated at the facto- ry. Before making any adjustments, this instrument should be in service for 24 hours. Thereafter, if any adjustment is required, perform the following procedure: Figure 6: Push Buttons Place a Certified Test Thermometer(s) in a solu- tion bottle(s) alongside the recorder’s sensor... -
Page 18: Battery Back-Up
HART ECORDER PERATION AND AINTENANCE The LED will flash the appropriate number of times to show the chart rotation speed that is selected. To perma- nently save the chart rotation speed that has been select- ed, press and release the “chart change” button (#3) and the recorder will resume normal operation. -
Page 19: Setting The Alarms
HART ECORDER PERATION AND AINTENANCE The relays that are used in this recording unit are latching type relays. That is the contacts of the relay will remain either closed or open (even when there is no power applied to the recorder) until the relay is pulsed with a sig- nal from the recorder to change the position of the con- tacts. -
Page 20: Chart Range Selection
HART ECORDER PERATION AND AINTENANCE Chart Range Selection If the recorder has a range sticker (that lists several tem- perature ranges) mounted on the front of the chart plate, under the chart, then the following section will apply to you. This recording unit has the option for the user to select from several temperature ranges that are programmed into the recorder. -
Page 21: Recorder Specifications
HART ECORDER PERATION AND AINTENANCE Recorder Specifications Input Replacement Parts Nominal Input Voltage: Single Phase 115/230VAC. -40 to 60°C Charts SPN104116 Nominal Input Current: 0.40mA/0.20mA -5 to 25°C Charts SPN107434 Nominal Input Frequency: 50-60 Hz. -45 to 0°C Charts SPN107435 Replacement Pens SPN104117 Battery... -
Page 22: Troubleshooting
Troubleshooting This table is intended to assist in resolving user-correctable freezer problems by relating symptoms to their likely causes. If service beyond the scope of this table is required, contact service at 1-800-553-0039. Symptom Probable Cause Action Does Not Run Unit unplugged. -
Page 23: Maintenance
Maintenance Cabinet Cleaning Warning The exterior of the freezer cabinet should be cleaned with When servicing the unit, disconnect a solution of mild soap and water. Do not use caustic from the electrical power source. soap or abrasive cleaners since these may damage the cabinet finish. -
Page 24: Wiring Diagrams
IRING IAGRAMS 230 VAC GRN/YEL DOOR SWITCH #1 FREEZER LIGHT DOOR SWITCH #2 (2-DOOR MODEL ONLY) PRPL EVAPORATOR DEFROST EVAPORATOR FAN CONTROL SWITCH 2 FAN(S) DOOR SWITCH #3 (3-DOOR MODEL ONLY) FACE HEATER(S) CONDENSATE DRAIN HEATER DEFROST TIMER DEFROST HEATER DEFROST CUT-OUT COIL SWITCH 1... -
Page 28: Warranty
(ii) misuse (including use inconsistent with written operating instructions for the product), mishandling, contamination, overheating, modification or alteration of the product by any customer or third party or (iii) use of replacement parts that are obtained from a party who is not an authorized dealer of Thermo Scientific prod- ucts.