Thermo Fisher Scientific Revco DxF ULT User Manual

Thermo Scientific

Revco

®

DxF -40C Upright Laboratory Freezer

Operating Manual 7048813 Rev. 3

Visit us online to register your warranty www.thermoscientific.com/labwarranty

Preface

Important installer and user information:

A redundant temperature sensing device has been included in this ULT freezer. This device is a type “T” thermocouple. For convenient access, the thermocouple (Figure 1-3) terminates in an interconnect jack

(Figure 1-5) behind the base front cover. (May be located differently in chests. See Section 1.) It is strongly recommended that this thermocouple be attached to a redundant 24 hour 7 day monitoring system with alarm capabilities. Connecting the sensor to a monitoring and alarm system separate from the freezer provides the utmost in product safety, should the integral system fail. s

Models covered by this manual

Catalog

Number

DxF24040A

DxF24040V

DxF24040D

DxF32040A

DxF32040V

DxF32040D

DxF40040A

DxF40040V

DxF40040D

Model

Capacity -

Cubic Feet

Voltage

8819

8820

8821

8822

8823

8813

8814

8816

8817

13

13

13

17

17

17

23

23

23

120/60

230/50

230/60

120/60

230/50

230/60

120/60

230/50

230/60

Packing List

Part Number Description

122005 Key

380520 Neoprene Cap

510016 1/4-20 x 5-1/2” Bolt

195763

370563

Retaining Clip

Remote Alarm Connector

Quantity

2

2

2

1

1

MANUAL NUMBER 7048813

3 40218 5/7/15 New start relay component - expl dwg ccs

2 29999 4/6/15 Updated controller - expl door drawing ccs

1 31726 2/24/15 Added RS-232 information ccs

0 31803/FR-2761 1/12/15 Release 11 - added -20C information and directives ccs

REV ECR/ECN DATE DESCRIPTION By

Thermo Scientific -40C Lab Freezer i

Preface

CAUTION

Contains Parts and Assemblies

Susceptible to Damage by

Electrostatic Discharge (ESD)

Important Read this instruction manual. Failure to read, understand and follow the instructions in this manual may result in damage to the unit, injury to operating personnel, and poor equipment performance. s

Caution All internal adjustments and maintenance must be performed by qualified service personnel. s

Material in this manual is for information purposes only. The contents and the product it describes are subject to change without notice. Thermo Fisher Scientific makes no representations or warranties with respect to this manual. In no event shall Thermo be held liable for any damages, direct or incidental, arising out of or related to the use of this manual.

The -40C freezers (see page i for model numbers) described in this manual are high performance units which can be used for research and in situations that directly support medical applications. When these products are used to support a medical application, it is an accessory to a medical device and is therefor considered as a medical device in its own right by the regulatory body ( e.g. FDA).

This product is intended for use:

• as cold storage in research use

• as a medical device for diagnostic use (storage of samples not intended to be re-introduced to the human body).

Registration: This medical application is considered a Class I device by the FDA. This product is classified as product code - JRM, regulation number 862.2050 and is considered a Class I device, 510(K) exempt.

©2015 Thermo Fisher Scientific. All rights reserved.

ii -40C Lab Freezer Thermo Scientific

Preface

Important operating and/or maintenance instructions. Read the accompanying text carefully.

Potential electrical hazards. Only qualified persons should perform procedures associated with this symbol.

Equipment being maintained or serviced must be turned off and locked off to prevent possible injury.

Extreme temperature hazards, hot or cold. Use special handling equipment or wear special, protective clothing.

Marking of electrical and electronic equipment, which applies to electrical and electronic equipment falling under the Directive 2002/96/EC (WEEE) and the equipment that has been put on the market after 13 August 2005.

This product is required to comply with the European Union’s Waste Electrical & Electronic

Equipment (WEEE) Directive 2002/96/EC. It is marked with the WEEE symbol. Thermo Fisher

Scientific has contracted with one or more recycling/disposal companies in each EU Member State

European Country, and this product should be disposed of or recycled through them. Further information on Thermo’s compliance with this directive, the recyclers in your country and information on Thermo Scientific products will be available at www.thermoscientific.com.

4 Always use the proper protective equipment (clothing, gloves, goggles, etc.)

4 Always dissipate extreme cold or heat and wear protective clothing.

4 Always follow good hygiene practices.

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

Thermo Scientific -40C Lab Freezer iii

Preface

Do You Need Information or Assistance on

Thermo Scientific Products?

If you do, please contact us 8:00 a.m. to 6:00 p.m. (Eastern Time) at:

1-740-373-4763

1-800-438-4851

1-877-213-8051 http://www.thermoscientific.com

[email protected]

www.unitylabservices.com

Direct

Toll Free, U.S. and Canada

FAX

Internet Worldwide Web Home Page

Tech Support Email Address

Certified Service Web Page

Our Sales Support 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 Service Support 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 Thermo Scientific products.

Whatever Thermo Scientific 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 6:00 p.m. Eastern Time. Please contact us by telephone or fax. If you wish to write, our mailing address is:

Thermo Fisher Scientific

401 Millcreek Road, Box 649

Marietta, OH 45750

International customers, please contact your local Thermo Scientific distributor.

iv -40C Lab Freezer Thermo Scientific

Thermo Scientific

Table of Contents

Section 1

Section 2

Installation and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

Control Panel Keys, Displays & Indicators . . . . . . . . . . . . . . . . . . . .1-3

Keypad Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

Freezer Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4

Choose the Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

Wall Bumper Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

Shelf Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

RS-232 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6

Remote Alarm Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

Attach the Line Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

Connect Unit to Electrical Power . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

Freezer Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

Set Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

Set High Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

Set Low Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-10

Calibrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

Calibrate the Control Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

Section 3 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Probe Failure Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

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

Clean the Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

Clean the Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Defrost the Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Prepare the Unit for Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Clean the Door Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

Clean the Vacuum Relief Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

Replace the Battery(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

Check the Battery(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

-40C Lab Freezer v

Table of Contents

Section 5 Factory Installed Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Vent Stack, Solenoid and Injection Assembly . . . . . . . . . . . . . . . . .5-2

Temperature Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

Connect the Probe/Solenoid Harness . . . . . . . . . . . . . . . . . . . . . . .5-4

BUS Operation and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

Configure the Optional Back-Up System . . . . . . . . . . . . . . . . . . . .5-5

Set the Optional Back-Up Setpoint . . . . . . . . . . . . . . . . . . . . . . . .5-6

Test BUS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

Clean Vent Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

Disconnect the Fitting Assembly & Transfer Hose . . . . . . . . . . . . .5-7

Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7

Install the Chart Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7

Change the Recorder Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

Calibrate the Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

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

Section 7 Exploded Parts Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1

Section 8 Refrigeration Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1

Section 9 Electrical Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

Section 10

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

Section 11 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-1 vi -40C Lab Freezer Thermo Scientific

Thermo Scientific

Section 1

Installation and Start-Up

Control Panel

Optional Back Up

System Controls

Temperature

Recorder

(Optional)

Figure 1-1. Front View

Figure 1-1

• Control Panel - keypad, displays and indicators.

• BUS (Optional Back Up System) panel.

• Optional temperature recorder - 7 day, one pen or Datalogger.

-40C Lab Freezer 1-1

Section 1

Installation and Start-Up

1-2 -40C Lab Freezer

Wall Bumper

(pre-tapped holes)

Optional Back-up

System Connections

RS-232 or RS-485

Interface

Power Switch

(mains disconnect)

Remote Alarm Contacts Power Inlet

Figure 1-2. Rear View

Figure 1-2

• Remote alarm contacts.

• Power Inlet for power cord connection.

• Optional BUS connections for probe and solenoid.

• RS-232 or RS-485 Communication

• Power Switch (mains disconnect).

Shelf

Bracket

Sealant

(Caution: This is a critical seal.

Seal must be maintained.)

Figure 1-3. Chamber Probe

Optional Miscellaneous Accessories Probe

Optional - Recorder Probe/Datalogger Probe

Control RTD/Redundant Type T

Thermocouple Probe

Vacuum

Relief Port

Figures 1-3 and 1-4

• Vacuum relief port: pressure equalization port.

• Probe cover: houses control, optional recorder, datalogger or miscellaneous accessory probes.

Chamber

Probe Cover

Figure 1-4. Vacuum Relief Port & Probe Cover Locations

Thermo Scientific

Section 1


Battery power switch

Thermocouple interconnect jack

Battery mounting bracket

O

Freezer battery and optional BUS battery

Figure 1-5. Battery(s) Location and Switch

Figure 1-5

• Battery mounting bracket(s)

• Battery power switch (freezer and BUS)

• Freezer battery

• Optional BUS battery

• Freezer filter location

Control Panel Keys,

Displays & Indicators

Mode Key

To remove filter

Alarm

Indicator

Silence

Key

Alarm

Panel

Thermo Scientific

Temperature Display

Figure 1-6. Control Panel

Up & Down

Arrows

Enter

Key


Section 1


Control Panel

(continued)

• Temperature Display - Displays temperature in degrees Celsius.

• Mode Select Switch - Used to select Run, Set Temperature, Set High

Alarm, Set Low Alarm, Calibrate, Backup.

• Alarm Indicator - Light pulses on/off during an alarm condition of the cabinet.

• Silence - Silences the audible alarm. See Section 4 for alarm ringback times.

• Alarm Panel - indicates the current alarm condition.

• Up and Down Arrows - Increase or decrease values, toggle between choices.

• Enter - Stores the changed value into memory.

Keypad Operation

The Revco DxF freezer has five basic modes to allow freezer setup and operation. Press the Mode key to scroll through the mode selections.

Figure 1-7. Basic Modes

Freezer Installation

Caution If tipped more than 45°, allow the unit to sit upright for 24 hours before start up. s

To remove the freezer from the pallet, use the 1/2" wrench to remove all bolts securing the shipping bracket to the pallet. Remove the shipping bracket.

Remove the ramp boards from the pallet and place the slotted ends over the ramp brackets on the pallet. The support blocks on the ramps will be facing down. Before moving the freezer, make sure the casters are unlocked and moving freely. Align the caster with the ramp boards. Use adequate personnel to roll the freezer off the pallet.

1-4 -40C Lab Freezer Thermo Scientific

Section 1


Freezer Installation

(continued)

The freezer can be easily pushed to the desired approved location. If necessary, the doors and lower front panel may be opened to move the unit through tight openings. When the freezer is in position, set the front caster brakes.

Caution The freezer must not be moved with product load inside. s

Caution For proper ventilation and airflow, a minimum clearance of 5” at the rear and top and a clearance of 8” on the side of the freezer is required.

Allow adequate space in the front of the freezer for door opening. s

Choose the Location

Locate the freezer on a firm, level surface in an area with an ambient temperature between 18°C and 28°C. Provide ample room to reach the mains disconnect switch (power switch) located on the rear of the freezer.

Wall Bumper Installation

The parts bag, located inside the cabinet, contains the following parts.

Qty

2

2

Stock # Description Purpose

510016 1/4-20 x 5-1/2” Bolt Wall Bumper

380520 Neoprene Cap Cap Protector

Install the bolts into the pre-tapped holes on the back of the compressor section. Install a neoprene cap on each bolt. Refer to Figure 1-2 for the locations of the pre-tapped holes.

Shelf Installation

Install the shelf clips into the shelf pilasters (front and back) at the desired shelf level. Install the shelves in the cabinet onto the clips.

Note Maximum shelf load is 100 lbs (45.4 kg) per shelf. s

Thermo Scientific -40C Lab Freezer 1-5

Section 1


RS-232 Communication

The Model 8800 Series freezer has a data communications interface. The factory default setting is RS-232.

The wiring identification for the interface is shown in Figure 1-8. One nine pin, sub "D" style connector is located on the back of the freezer. See

Figure 1-2 for the location of the connector on the freezer.

Figure 1-8. RS-232 Interface

The freezer transmits temperature information every 60 minutes. A standard DB9 serial extension cable can be used to connect the freezer to a serial device. Some serial devices may require a null modem adapter.

Data format:

Baud . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1200

Data bits . . . . . .8 (7 bit ASCII with leading zero)

Start bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Stop bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Parity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .none

The data transfer sequence is transmitted in the following format. X refers to numerical temperature data.

(NUL) (-) XXX (SP) C (SP) (Error Message) (SP) (LF) (CR) (EOT) (SP)

In the event of a CNTRLFAIL, Er07, or the control probe is out of range error, the numerical temperature data (XXX) in the transmission would be replaced by T_ERR.

If no alarm condition exists, spaces will be sent. A total of 20 characters will be sent.

SP - Space LF - Line feed

CR - Carriage return EOT - End of text (4)

NUL - Null character (00)

If an alarm condition does exist, “Error Message” in the protocol will be replaced by the following:

UNDERTEMP (temperature above the low alarm setpoint)

OVERTEMP (temperature below the high alarm setpoint)

PWRFAIL (AC power failure)

CNTRLFAIL (Control probe failure)

Er07 (micro failure)

HSHX FAIL (Heat exchanger failure)

HOT COND (Hot condenser)


Section 1


Remote Alarm Contacts

See Figure 1-2 for the location of the remote alarm contacts. The remote alarm connector is located in the parts bag provided with the manual. It must be installed if connecting the freezer to an alarm system. After installing the wiring from the alarm system to the connector, install the connector to the freezer microboard and secure with the two screws provided. The remote alarm provides a NO (normally open) output, a NC

(normally closed) output and COM (common). The contacts will trip on a power outage, and high or low temperature alarm. They will also trip on control probe or microboard failure. Figure 1-9 shows the remote contacts in alarm state.

IMPORTANT USER INFORMATION

CAUTION! Stored product should be protected by a redundant 24 hour/day monitoring system with alarm capability. An interconnect jack and thermocouple are installed for centralized monitoring, should on-board system fail.

Figure 1-9. Remote Alarms Contacts

Attach the Line Cord

Insert the power line cord into the power inlet module. Place the retaining bracket (P/N 195763) over the connector. Tighten retaining screws to secure.

Figure 1-10.

Line Cord


Section 1


Connect Unit to Electrical

Power

Note See the serial tag on the side of the unit for electrical specifications or refer to the electrical schematics in this manual. s

The freezer should be operated on a dedicated grounded service. Check the voltage rating on the serial tag of the unit and compare it with the outlet voltage. Then, with the power switch turned off, plug the line cord into the wall outlet.

First, turn on the freezer power switch. Then open the lower front door by grasping the bottom left corner. Locate the battery switch (Figure 1-5) and turn it to Standby mode ( ). During initial freezer start-up, the system battery may require charging and the Low Battery indicator may illuminate.

Caution Ensure the battery switch is turned to Standby mode ( ). The rechargeable batteries require 36 hours to charge at initial start-up. A “Low

Battery” alarm may occur until the batteries are fully charged. Should a power failure occur during the initial start-up period, the electronics will have limited operation. s

Freezer Start-Up

With the freezer properly installed and connected to power, system setpoints can be entered. The following setpoints can be entered in

Settings mode: Control temperature, high temperature alarm setpoint, low temperature alarm setpoint, and (optional) BUS setpoint. Default settings are shown in the table below.

Control Set Point

High Temperature Alarm

Low Temperature Alarm

Optional BUS Set Point

-40°C

-30°C

-50°C

-30°C

Note If the setpoint is changed and the low temperature and high temperature alarms are set 10° from the setpoint, the alarm setpoints will be adjusted automatically to maintain a distance of at least 10° from setpoint. s


Section 1


Set Operating

Temperature

Revco DxF -40°C freezers have an operating temperature range of -10°C to -40°C. The freezer is shipped from the factory with a temperature setpoint of -40°C. To change the operating temperature setpoint:

1. Press the Mode key until the Set Temperature indicator lights.

2. Press the up/down arrow key until the desired temperature set point is displayed.

3. Press Enter to save the setpoint.

4. Press the Mode key until the Run indicator lights for Run mode

If no keys are pressed, the freezer will automatically return to RUN mode after 5 minutes.

Note At -20°C operation, the probe may need to be calibrated to ensure cabinet temperatures are within the required range. Refer to the

Calibration section for the procedure. s

Set High Temperature

Alarm

The high temperature alarm activates an audible/visual warning when the freezer chamber temperature has reached or exceeded the high temperature alarm setpoint.

To set the high temperature alarm setpoint:

1. Press the Mode key until the Set High Alarm indicator lights.

2. Press the up or down arrow key until the desired high temperature alarm setpoint is displayed.

3. Press Enter to save the setting.

4. Press the Mode key until the Run indicator lights for Run mode.

If no control keys are pressed, the freezer will automatically return to RUN mode after 5 minutes.

Note The high alarm set point must be set at least 5°C from the control set point. s

Caution At initial start-up, the high temperature alarm is disabled until the cabinet reaches setpoint, or 12 hours elapse. s


Section 1


Set Low Temperature

Alarm

The low temperature alarm activates an audible/visual warning when the freezer chamber temperature reaches or decreases below the low temperature alarm setpoint.

To set the low temperature alarm set point:

1. Press the Mode key until the Set Low Alarm indicator lights.

2. Press the up or down arrow key until the desired low temperature alarm setpoint is displayed.



If no control keys are pressed, the freezer will automatically return to RUN mode after 5 minutes.

Note The low alarm set point must be set at least 5°C from the control set point. s

Run Mode

Run mode is the default mode for the freezer. Run mode displays the cabinet temperature on the temperature display under normal operating conditions.

This information is scrolled by pressing the up or down arrow keys. The display will return to the operating temperature in 10 seconds if no keys are pressed.


Section 2

Calibrate

After the freezer has stabilized, the control probe may require calibration.

Calibration frequency is dependent on use, ambient conditions and accuracy required. A good laboratory practice would require at least an annual calibration check. On new installations, all parameters should be checked after the stabilization period.

Note At -20°C operation, the probe may need to be calibrated to ensure cabinet temperatures are within the required range. Refer to the

Calibration section for the procedure. s

Caution Before making any calibration or adjustments to the unit, it is imperative that all reference instruments be properly calibrated. s

Calibrate the Control

Probe

Plug a type T thermocouple reader into the receptacle inside the lower door (Figure 1-5). Compare the control temperature setpoint to the temperature of the measuring device.

1. Press the Mode key until the Calibrate indicator lights.

2. Press up/down arrow to match the display to calibrated instrument.

3. Press Enter to store calibration.

4. Press the Mode key to return to Run mode.

Probe Calibration for -20C Operation

Note If the peak variation is within ±5°C of set value, then no calibration is required. s

1. Set temperature to -20C.

2. Calibrate probe to -4°C (-2.5 for 13 ft units) per above procedure.

3. Allow unit to stabilize to -20°C per temperature stabilization period below.

4. Check peak variation after unit has achieved steady state operation.

Probe may need to be calibrated a second time to achieve the required range.


Section 2

Calibrate

Calibrate the Control

Probe (continued)

Temperature Stabilization Periods

Start-up - Allow 12 hours for the temperature in the cabinet to stabilize before proceeding.

Already Operating - Allow at least 2 hours after the display reaches set point for temperature to stabilize before proceeding.

Caution During calibration, the temperature display is disabled. s

If no keys are pressed for approximately five minutes while in Calibration mode, the system will return to Run mode.


Section 3

Alarms

Revco DxF freezer alarms are displayed on the freezer control panel.

When an alarm is active, the indicator next to the alarm description will light and there will be an audible alarm. Press the Silence key to disable the audible alarm for the ringback period. The visual alarm will continue until the freezer returns to a normal condition. The alarms are momentary alarms only. When an alarm condition occurs and then returns to normal, the freezer automatically clears the alarm condition.

Description

Power Failure

Delay Ringback

1 min. 15 min.

High Temperature Alarm 1 min.

Low Temperature Alarm 1 min.

15 min.

15 min.

Probe Failure

Door Open

Wrong Power

1 min.

1 min.

0 min.

15 min.

15 min. none

No

No

Yes

Relay

Yes

Yes

Yes

Low Battery* 1 min.

Low BUS Battery (optional) 1 min.

Hot Condenser

MicroBoard Failure

1 min.

0 min.

12 hours

15 min.

none

15 min.

No

No

No

Yes

All alarm delays and ringback times are ±30 seconds.

*The automatic battery test runs immediately on initial start-up, then every 8 hours thereafter.

Probe Failure Alarm

The microprocessor in Revco DxF freezers continually scans all probes, including the control probe, heat exchanger probe and condenser probe, to ensure that they are operating properly. Should an error be detected, the

"Probe Failure" alarm occurs as described above. If an error is detected with the control probe, the high and low stage compressors run continuously. As a result, the cabinet temperature decreases until it reaches the lowest temperature the refrigeration system can maintain. If an error is detected with the heat exchanger probe, the freezer cycles properly at its temperature setpoint using a 5 minute step-start between the high and low stage compressors. If an error is detected with the condenser probe, there is no impact on the performance of the freezer; however, the hot condenser alarm may also occur. Contact the Technical

Services department or your local distributor.


Section 3

Alarms

Error

Er00

ErA1

ErC1

Erd1

ErE1

ErF1

Erg1

ErH1

Notes

Name: Improper model selected.

Description: Indicates that DIP SW3 has not selected a proper model or can’t be accessed properly.

Response: Display shows “Er00” and will not start-up until a proper model is selected. Contact Technical Services.

This error condition will prevent peripherals (fans, compressors, etc.) from powering up with the incorrect voltage.

Name: Voltage/Frequency failure

Description: Indicates the measured RMS line voltage did not agree with the logic level sensed by the micros provided by the installed high voltage PCB; or the measured RMS voltage is not within a tolerable range (<180VAC < 270 for 230VAC unit / <

85VAC < 160 for 115VAC unit); or the frequency measured over 10 cycles was not within a tolerable range (55 Hz < Freq < 70 Hz for 60 Hz units / 40 Hz < Freq < 55 Hz for 50 Hz units)

Response: This condition is checked at power on reset and if it is active, the unit will NOT power up. The unit will indefinitely display “Er_1” in the display and continue to monitor the frequency and voltage. Furthermore, the audible alarm will sound. Other startup error messages may be displayed prior to this message; however, the system will stop the startup sequence for this condition.

ErA1 .. No pulses (zero crossings) detected to determine frequency (50 / 60 Hz)

ErC1 .. Frequency detected is below 50 Hz

Erd1 .. Frequency detected is above 60 Hz (Possible noise spikes on supply voltage)

ErE1 .. Unit is 230V and the voltage detected is below the low limit (180VRMS)

ErF1 .. Unit is 230V and the voltage detected is above the high limit (260VRMS)

Erg1 .. Unit is 115V and the voltage detected is below the low limit (85VRMS)

ErH1 .. Unit is 115V and the voltage detected is above the high limit (160VRMS)

Er02

Name: Control (Cabinet) Sensor Failure

Description: This condition indicates that the control sensor has failed to produce a valid reading for >12 consecutive reads (~60 seconds).

Response: The unit will stage both compressors on (if necessary) and the unit will attempt to head to bottom out. If the sensor recovers, the system will begin to operate normally and respond to the temperature feedback. The remote alarm contacts will become active. ‘Er02’ will be added to the main display queue and the last valid cabinet temperature value will not be displayed.


Section 3

Alarms

Error (cont.) Notes

Er05

Er06

Er07

Er09

Er11 dErr

Name: Display Firmware Integrity Failure

Description: The display firmware has failed to pass its CRC CCITT checksum integrity test.

Response: The display performs this check at startup and the display board will fail to startup without any error indication if it does not pass this at power on.

Name: Micro Firmware Integrity Failure

Description: The micro firmware has failed to pass its CRC CCITT checksum integrity test.

Response: This is checked at power on reset and the “Er06” will be displayed for ~10 seconds at startup if this condition exists.

Name: Micro Fail - CS5521 SPI Failure / UISR Failure

Description: This condition indicates a micro board failure due to either the SPI bus is unable to communicate with the ADC device or a UISR event caused the microcontroller to be in an unstable state.

Response: The unit will try to recover from this fault three times by a hardware reset of the micro board. In the event that the system couldn’t rectify the issue, the following sequence of events will occur:

1. Remote alarm contacts will become active.

2. Buzzer will annunciate audibly and will have a ringback of 15 minutes.

3. “Seven segment” display will show “Er07”.

4. The compressor will activate.

5. The system will go to bottom out temperatures.

Name: Stuck Button

Description: This condition indicates that the display board has a stuck button.

Response: The Er09 will show on the display periodically.

Name: Condenser Probe Sensor Failure

Description: This condition indicates that the condenser probe sensor has failed to produce a valid reading for >12 consecutive reads (~60 seconds).

Response: The display shows “Er11”.

This is a general display error in which value being displayed can not be represented within characters provided.

(Four dashes)

---- in display

Name: Lost Communication

Description: Communication between the micro board and the display board has been lost. Under this condition, the visual alarm flashes along with dashes in the temperature display (----). Contact Technical Services.


Section 4

Maintenance

Warning Avoid the excessive use of water around the control area due to the risk of electrical shock. Damage to the controls may also result. s

Wipe down the freezer exterior using soap and water and a general-use laboratory disinfectant. Rinse thoroughly with clean water and dry with a soft cloth.

Clean the Air Filter

The procedure for cleaning the air filter (minimum of four times a year) follows.

1. Open the front lower door by grasping the bottom left corner.

2. Locate the grille on the door. See Figure 4-1. Grasp the middle of the grille material and gently pull out to remove.

3. Wash the filter material using water and a mild detergent.

4. Dry by pressing between two towels.

5. Install the filter back into the grille and attach the grille.

Depending upon environmental conditions, the filter may need to be cleaned or replaced more frequently. If the filter becomes torn or excessively dirty, a replacement can be purchased from Thermo. See the exploded parts list for the filter part number. A filter kit (set of 5) is also available.

Battery power switch

Thermocouple interconnect jack

Battery mounting bracket

O

Freezer battery and optional BUS battery

Figure 4-1. Component Locations


Section 4

Maintenance

Clean the Condenser

The procedure for cleaning the condenser (minimum yearly) follows.

1. Open the front lower door by grasping the bottom left corner. See

Figure 1-5.

2. Using a vacuum cleaner, exercising care to not damage the condenser fins, clean the condenser.

Depending upon environmental conditions, the condenser may need to be cleaned more frequently.

Caution Do not use liquids that are corrosive to stainless steel or the brazing material (copper or nickel). s

Defrost the Chamber

The procedure for defrosting the chamber follows.

1. Remove all product and place it in another freezer.

2. Turn the unit off and disconnect it from the power source.

3. Turn off the battery switch (O). See Figure 4-1.

4. Open all of the doors and place towels on the chamber floor.

5. Allow the frost to melt and become loose.

6. Remove the frost with a soft cloth.

7. After defrosting is complete, clean the interior with a non-chloride detergent. Rinse thoroughly with clean water and dry with a soft cloth.

8. Plug unit in and turn power switch on.

9. Turn the battery power switch to Standby mode ( ).

10. Allow the freezer to operate empty overnight before reloading the product.

Prepare the Unit for

Storage

Defrost the unit as described previously. This prepares the unit for storage.

Turn off the battery power switch (O). Turn off the freezer power switch.

Disconnect power to the battery(s) and to the freezer.

Caution If the unit has been in service, turn it off and disconnect the power cord connector before proceeding with any maintenance. s


Section 4

Maintenance

Clean the Door

Gasket

The procedure for cleaning the door gasket (minimum monthly) follows.

Using a soft cloth, remove any frost build-up from the gasket and door(s).

The door gasket may need to be cleaned more frequently if dirt or excessive frost build-up prevents the door from closing properly.

Clean the Vacuum

Relief Port

The exterior door gasket provides an excellent seal that protects product, provides an energy efficient thermal barrier to keep cold air in and room temperature air out and reduces frost build up on the inner doors.

Because the door gasket seals so well, a vacuum can be created after a door opening. Warm air enters the cabinet, cools and contracts, creating a vacuum that pulls the door in tightly against the seal.

To equalize the pressure inside the cabinet after a door opening requires

1.5-3.0 cu.ft. of ambient air to be drawn into the cabinet. The amount of air required to equalize the pressure varies depending on the cabinet size, cabinet temperature, duration of door opening, inventory volume and the temperature/humidity of the ambient air. The unit is designed with a

‘vacuum relief port’ to allow the pressure to be equalized.

The time required to draw 1.5-3.0 cu.ft. of air into the cabinet depends on two factors, a) size and number of paths available for the air to enter the cabinet, b) pressure difference between the internal cabinet and the ambient room.

Cabinets with the vacuum relief port operating normally, (i.e. vacuum relief port is not iced over) will require a minimum of

30 seconds up to a maximim of 120 seconds for the cabinet to equalize. This is also a good indication that the exterior door is well sealed.

Vacuum

Relief Port

The vacuum relief port requires routine maintenance. It will ice over unless preventive measures are taken. If the vacuum relief port becomes iced over, the freezer will take several hours to equalize pressure.

Figure 4-2. Port Location


Section 4

Maintenance

Clean the Vacuum

Relief Port (cont.)

Caution Do not leave the freezer unattended with the door unlatched. The vacuum could release, resulting in a door opening and possible product loss. s

Observe the inner side of port with each door opening for frost and ice build-up. Remove any frost with a soft dry cloth. If the tube should become clogged with ice, it must be cleaned. Make sure during cleaning that the vacuum relief tube is completely free of ice to prevent rapid ice formation.

Other factors that can affect the performance of the vacuum relief port include: high ambient temperature, high humidity conditions and frequent door openings. Maintenance should be performed weekly, or as needed.

Caution Failure to maintain the vacuum relief port may result in excessive ice build-up inside the tube, clogging the port, resulting in an inability to open the door. The vacuum relief port may need to be cleaned more often with frequent door openings and high humidity environments. s

Replace the Battery(s)

1. To gain access to the battery, open the lower door by grasping the bottom left corner. The battery is rectangular in shape, located on the front left corner of the compressor compartment and is secured in place by a mounting bracket.

2. Directly above the battery(s) is the battery power switch. Turn the battery power switch to the Off position (O).

3. Disconnect the battery connections.

4. Remove the old battery and install the new battery.

5. Reconnect the battery (red to positive and black to negative).


8. Close lower panel door.

Caution The % of charge can vary depending on the age, usage and condition of the battery. For a consistent and dependable charge, replace the battery every 2 years. Replacement batteries must be rechargeable and are available from Thermo. Refer to the parts list for stock number and description of the replacement batteries. Dispose of used batteries in a safe manner and in accordance with good environmental practices. s


Section 4

Maintenance

Check the Battery(s)

1. To gain access to the battery, open the lower door by grasping the bottom left corner. The battery is rectangular in shape, located on the front left corner of the compressor compartment and is secured in place by a mounting bracket.

2. Directly above the battery(s) is the battery power switch. Turn the battery power switch to the off position (O).

3. Cut the tie wrap securing the battery to the mounting bracket. Lift the battery out of the bracket.

4. Disconnect the red and black wires from the battery.

5. Use a voltmeter set to DC volts. Matching the wire colors, connect the meter to the battery.

6. If the voltage reads less than 10.8 volts, replace the battery. If above

10.8, re-install as previously.


8. Close lower panel door.




Section 5

Factory Installed Options

Described below are the factory installed options which are available, or may be already installed, on your unit.

Back-Up System (BUS)

- P/N 1950533, 1950535

Warning Before installation of BUS components, make sure the power to the freezer is disconnected, the battery switch is turned off (O) and the freezer has warmed to ambient temperature. s

The built-in BUS (back up system) will keep the freezer chamber temperature below the critical level in the event of a power or equipment failure. If power to the freezer fails, or temperature increases to the back up alarm set point, the BUS injects liquefied gas into the chamber to keep the chamber temperature within the specified range.

The BUS operates on an internal 12-volt, rechargeable battery which is kept charged during normal operation by the integral battery charger.

Thermo Scientific

Figure 5-1. Injection Assembly


Section 5

Factory Options

Vent Stack, Solenoid and

Injection Assembly

1. Install the injection assembly (Figure 5-1) through the 1/2” prepunched hole, directly behind the 2” vent stack hole in the center of the chamber ceiling.

Note Cover the open end of injection assembly with tape to keep insulation from entering the nipple. s

2. Slide 3/8” flatwasher over open end of nipple.

3. Insert the covered end of the injection assembly through the exterior hole.

4. Remove the tape covering from the end of the nipple and install the

1/8” NPT brass tee on the open end of the nipple. Place Permagum sealant between the brass tee and the interior top.

5. Remove the two Phillips head screws securing the metal bracket on the vent stack assembly.

6. Install the vent stack (Figure 5-2) through the opening and secure it to the top of the freezer, using screws.

7. On the cabinet interior, seal around the end of the vent stack with

Permagum.

8. Install the transfer hose connecting one end to the injection assembly, the other end to the solenoid valve. Install the solenoid valve to the supply source. The solenoid mounting bracket is not required and may be discarded.

Caution When selecting a CO

2 supply cylinder, it must be equipped with a siphon tube. s


Figure 5-2. Vent Stack Assembly

Thermo Scientific

Section 5

Factory Options

Temperature Probe

1. Locate the 0.500” pre-punched hole in the upper left hand back corner of the chamber ceiling. Remove the tie wrap securing the coiled probe/solenoid harness. Uncoil the probe lead and run the probe tip

(approximately 12”) down through 0.500” porthole (Figure 5-4).

2. As shown in Figure 5-3, thread the small tie wrap through the openings in the front of the bracket. Secure the probe on the back of the bracket with the tie wrap.

3. Tap #8-32 the two pre-punched holes located on the interior left wall of the freezer. Mount the bracket. Figure 5-4 shows the Back-Up probe mounted on the interior left side wall of the freezer.

195419

Probe Mounting

Bracket

30037

Small Tie

Wrap

290167

Back-Up Probe

Figure 5-3. Probe

Thermo Scientific

Figure 5-4. Bracket


Section 5

Factory Options

Connect the Probe/

Solenoid Harness

1. Remove the four screws on the freezer back panel and use them to mount the tie wrap anchors as shown in Figure 5-5. Secure the probe wire with tie wraps.

2. Plug the solenoid/probe connector into the BUS connection and secure with a screw on the right and left side. The connector is keyed.

3. Loosen the terminal screws on the solenoid. Slide the spade lug connectors under the screws and tighten to secure.

4. Connect power to the freezer. Turn the freezer On, with battery switch

Off (O).

a. The Solenoid Engaged light on the BUS control panel will illuminate (no injection occurs). This light stays on until the unit is below BUS setpoint.

b. The Low Battery indicator may also illuminate.

5. Turn the battery switch to Standby mode ( ) to charge both batteries.

Tie wrap anchor

Probe wire

BUS connection

Remote alarm contacts and analog output

Figure 5-5. Routing

Power Inlet

Spade lug connections to solenoid

RS-232 or RS-485

Interface

Power switch

(mains disconnect)


Section 5

Factory Options

BUS Operation and

Maintenance

Warning When activated, this unit injects liquid nitrogen or carbon dioxide. Liquid nitrogen can cause serious freezing (frostbite) if it comes in contact with unprotected skin or eyes. Nitrogen suppresses oxygen levels and may cause suffocation if area is not well ventilated. Refer to Appendix

A for the proper handling of liquid LN

2

. s

Caution Make sure the pressure relief valve on any LN

2 tank is adjusted to

30 PSI maximum blow-off. s

Warning Carbon dioxide gas suppresses oxygen levels and may cause suffocation if area is not well ventilated. Refer to “Handling Liquid CO

2

” in Appendix B of this manual. s

Power - indicates the unit has AC power.

Low Battery - battery charge is low. The battery needs replaced or recharged.

Solenoid Engaged - BUS has opened the solenoid so it can inject gas (CO

2 or LN

2

).

Press-To-Test - Activates the solenoid and injects LN

2 or CO

2 into the freezer chamber as long as the button is depressed. The solenoid engaged indicator should light. If the Low Battery indicator lights during the test, replace the BUS battery.

Note Solenoid will not engage if door is open. s

Figure 5-6. BUS Control Panel

Configure the Optional

Back-Up System

The optional BUS can be configured for LN

2 or CO

2 supply. To select the supply type:

1. Press the Mode key until the Back-up indicator lights.

2. Press the up or down arrow key. The display will show ‘Co2’ for CO

2 selection and ‘Ln2’ for LN

2 selection.



If no control keys are pressed, the freezer will automatically return to Run mode after 5 minutes.


Section 5

Factory Options

Set the Optional Back-Up

Setpoint

The optional back up system is designed to inject CO

2 or LN

2 into the freezer compartment if the temperature rises above back up system set point. To set the BUS set point:

1. Press the Mode key until the Set Temperature and Backup indicators light.

2. Press the up or down arrow key until the desired BUS set point is displayed.



If no control keys are pressed, the freezer will automatically return to Run mode after 5 minutes.

Caution Changing the operating temperature set point can affect the BUS set point. The BUS set point will self adjust to maintain a temperature of at least 10°C above the operating temperature set point. s

Caution The BUS set point cannot be set any colder than the high temperature alarm set point (see Section 1). If the back-up system is installed with CO

2

, then -65°C is the coldest BUS set point that can be used (if the cabinet set point is -75°C or colder). s

Test BUS Operation

After the freezer has stabilized and both batteries are fully charged, the

BUS can be tested to verify proper operation.

1. Disconnect AC power to the freezer by turning the power switch off.

2. As the freezer warms up, verify the BUS injects at the desired temperature. Displayed temperature may vary by a few degrees from inject temperature due to the differences in probe locations.

Clean Vent Stack

Routinely check the vent stack for frost or ice build-up. The type of frost that forms in the vent stack is generally very soft and may be easily removed with a bristle brush or soft cloth. If ice build-up has occurred, a complete defrost may occasionally be required. See Section 4 for freezer defrost instructions.


Section 5

Factory Options

Disconnect the Fitting

Assembly & Transfer Hose

To disconnect the freezer back-up from the gas supply:

1. Close the supply valve.

2. Depress the test button on the BUS control box to remove the gas from the line.

3. Slowly disconnect the fitting assembly from the supply (in the event that any gas remains in the line).

Chart Recorder

3

1 2

Procedures concerning the use and maintenance of the optional recorder follow.

Program selection and calibration buttons

3

1 2

Range Sticker

Figure 5-7. Recorder Details

Install the Chart Paper

1. Open the glass door of the recorder and press button #3 until the pen begins to move outward.

2. Unscrew the knob at the center of the chart and remove the paper.

3

1 2

Figure 5-8.

Buttons

3. Install the new chart paper, position the paper to the correct time line and replace the knob.

4. Remove the cap from the felt pen and press button #3.


Section 5

Factory Options

Change the Recorder

Range

The chart recorder contains eight temperature ranges and is factoryprogrammed for the freezer.

1. Press and hold button #3 for one second, then let the pen move off the chart paper.

2. Press and hold for five seconds either button #1 or button #2.

3. Release the button and the green LED will begin to flash. Count the number of flashes to determine the present program setting.

4. To change the program setting, press the left or right arrows to increase or decrease the count.

5. When the desired program number is flashing, press button

#3 to bring the pen arm back onto the chart. Recording will begin in the new program.

Program

5

6

7

8

3

4

1

2

From

0

-100

-115

-10

-40

0

-100

-5

To

30°C

60°C

38°C

50°C

100°C

200°C

50°C

70°C

Calibrate the Chart

Recorder

Caution The recorder must be in service for 24 hours before performing the following calibration procedure. s

1. Place an accurate thermometer in the chamber next to the recorder probe.

2. Temperature probes for the recorder are located in the left front corner of the freezer chamber (Figure 1-4).

3. After about three minutes, compare the thermometer reading with the chart recorder reading.

4. If an adjustment is necessary, press the #1 button to move the pen to the left or the #2 to move the pen to the right. The button must be held about five seconds before the pen begins to move. Release the button when the pen position matches the thermometer.

Note The felt-tip pen on the recorder requires periodic replacement.

Usually the ink will appear to fade before replacement becomes necessary.

Additional pen tips may be purchased from Thermo. s


Thermo Scientific

Section 6

Specifications

Number (Model) DxF24040A (8813)

Temperature Range -10°C (-14°F) to -40°C (-40°F)

Exterior Dimensions

Interior Dimensions

33.3”W x 77.9”H x 32.9”

84.6 x 197.9 x 83.6cm

23.0”W x 51.5”H x 19.3”

58.4 x 130.8 x 49.0cm

Capacity 13.0 cu. ft. (368.1 liters)

Refrigeration

Insulation

DxF24040V (8814) DxF24040D (8816)

One 1 HP (2545 BTUH each)

Non-CFC, foamed-in-place urethane: 5.0” (12.7cm) cabinet; 4.5” (11.4 cm) door

Electrical - nominal voltage ±10%

120V, 60 Hz, 10 FLA

Operating Range: 108-130VAC

Breaker Requirements

20 amp Dedicated Circuit,

20 Amp Time Delay Breaker

Shipping Weight: Motor 711 lbs. (323 kg)

230V, 50 Hz, 6.5 FLA




230V, 60 Hz, 6.5 FLA





Temperature Range

Exterior Dimensions


-10°C (-14°F) to -40°C (-40°F)

33.3”W x 77.9”H x 38.9”

84.6 x 197.9 x 98.8cm

23.0”W x 51.5”H x 25.3”

58.4 x 130.8 x 64.3cm

DxF32040V (8819)

Capacity 17.3 cu. ft. (489.9 liters)

Refrigeration

Insulation

DxF32040D (8820)

One 1 HP (2545 BTUH each)



120V, 60 Hz, 10.0FLA


230V, 50 Hz, 6.5FLA


230V, 60 Hz, 6.5FLA



20 Amp Dedicated Circuit,








Section 6

Specifications


Temperature Range -10°C (-14°F) to -40°C (-40°F)

DxF40040V (8822)

Exterior Dimensions 40.8”W x 77.9”H x 38.9” (103.6 x 197.9 x 98.8 cm)


Capacity

30.6”W x 51.5”H x 25.3” (77.7 x 130.8 x 64.3 cm)

23.0 cu. ft. (651.3 liters

DxF40040D (8823)

Refrigeration One 1 HP (2545 BTUH each)

Insulation



120V, 60 Hz, 10.0 FLA


230V, 50 Hz, 6.5 FLA


230V, 60 Hz, 6.5 FLA



20 Amp Dedicated Circuit,





940 lbs. (426 kg)



940 lbs. (426 kg)

Certifications

2004/108/EC Electromagnetic Compatibility Directive 2006/95/EC Low Voltage Directive

2011/65/EL RoHS

Declaration of Conformity and Directives are available from the factory

Safety Specifications

Indoor Use Only

Altitude - Up to 2,000 meters

Temperature - 5°C to 43°C

Humidity - Maximum RH 80% for temperatures up to 31°C, decreasing linearly to 50% RH at 40°C

Mains Supply Fluctuations - Mains supply voltage fluctuations not to exceed ±10% of the nominal voltage

Installation Category II 1

Pollution Degree 2 2

Class of Equipment I

Intended Use

This product is intended for use as a General Purpose Laboratory Freezer for storing samples or inventory between -40 and

-86C.

This unit is not intended for use in an explosive environment, nor to be used for the storage of flammable inventory. This unit is not intended for use in a Class II medical application as defined by Title 21 of the Federal Code of Regulations.

1 Installation category (overvoltage category) defines the level of transient overvoltage which the instrument is designed to withstand safely. It depends on the nature of the electricity supply and its overvoltage protection means. For example, in CAT II which is the category used for instruments in installations supplied from a supply comparable to public mains such as hospital and research laboratories and most industrial laboratories, the expected transient overvoltage is 2500V for a 230V supply and 1500V for a 120V supply.

2 Pollution degree describes the amount of conductive pollution present in the operating environment. Pollution degree 2 assumes that normally only non-conductive pollution such as dust occurs with the exception of occasional conductivity caused by condensation.


Section 7

Parts List

Thermo Scientific

Exploded Drawing

Cabinet Assembly

Upright Freezers

(R - H - I)

8800-200-1-B Rev. 2

Page 1 of 2


Section 7

Parts List


Exploded Drawing

Cabinet Assembly

Upright Freezers

(R - H - I)

8800-200-1-B Rev. 2

Page 2 of 2

Thermo Scientific

Section 7

Parts List

Single Door BOM Assembly

(R - H -86)

Thermo Scientific

8920-201-1-B Rev. 3

Page 1 of 2


Section 7

Parts List

Single Door BOM Assembly

(R - H -86)


8920-201-1-B Rev. 3

Page 2 of 2

Thermo Scientific

Section 7

Parts List


Section 7

Parts List


Section 7

Parts List

Thermo Scientific

Exploded Drawing

230V Relay

Enclosure -

Freezers

902-204-1-B Rev 1

Page 1 of 2


Section 7

Parts List


Exploded Drawing

230V Relay

Enclosure -

Freezers

902-204-1-B Rev 1

Page 2 of 2

Thermo Scientific

Section 7

Parts List

Thermo Scientific

Exploded Drawing

120V Relay

Enclosure -

Freezers

902-204-2-B Rev. 1

Page 1 of 2


Section 7

Parts List


Exploded Drawing

120V Relay

Enclosure -

Freezers

902-204-2-B Rev. 1

Page 2 of 2

Thermo Scientific

Section 7

Parts List


Section 7

Parts List


Section 8

Refrigeration Schematics


Section 8

Refrigeration Schematics


Section 9

Electrical Schematics


Section 9



Section 9



Section 9



Section 9



Section 9



Section 11

Warranty Information

ISO 9001


Section 11

Warranty Information

ISO 9001


Appendix A

Handling Liquid Nitrogen

Warning Contact of liquid nitrogen or cold gas with skin or eyes may cause serious freezing (frostbite) injury. s

Handle liquid nitrogen carefully.

The extremely low temperature can freeze human flesh very rapidly. When spilled on a surface the liquid tends to cover it completely and intimately, cooling a large area. The gas issuing from the liquid is also extremely cold. Delicate tissue, such as that of the eyes, can be damaged by an exposure to the cold gas which would be too brief to affect the skin of the hands or face.

Never allow any unprotected part of your body to touch objects cooled by liquid nitrogen.

Such objects may stick fast to the skin and tear the flesh when you attempt to free yourself. Use tongs to withdraw objects immersed in the liquid, and handle the object carefully.

Wear protective clothing.

Protect your eyes with a face shield or safety goggles (safety glasses without side shields do not give adequate protection). Always wear gloves when handling anything that is, or may have been, in immediate contact with liquid nitrogen. Insulated gloves are recommended, but heavy leather gloves may also be used. The gloves should fit loosely, so that they can be thrown off quickly if liquid should splash into them. When handling liquid in open containers, it is advisable to wear high-top shoes. Trousers (which should be cuffless if possible) should be worn outside the shoes.

The safe handling and use of liquid nitrogen in cryogenic refrigerators and dewar flasks is largely a matter of knowing the potential hazards and using common-sense procedures based on that knowledge. There are two important properties of liquid nitrogen that present potential hazards:

1. It is extremely cold. At atmospheric pressure, liquid nitrogen boils at -320°F (-196°C).

2. Very small amounts of liquid vaporize into large amounts of gas. One liter of liquid nitrogen becomes 24.6

cu. ft. (700l) of gas.

The safety precautions in this booklet must be followed to avoid potential injury or damage which could result from these two characteristics. Do not attempt to handle liquid nitrogen until you read and fully understand the potential hazards, their consequences, and the related safety precautions. Keep this booklet handy for ready reference and review.

Note Because argon is an inert gas whose physical properties are very similar to those of nitrogen, the precautions and safe practices for the handling and use of liquid argon are the same as those for liquid nitrogen. s

Use only containers designed for low temperature liquids.

Cryogenic containers are specifically designed and made of materials that can withstand the rapid changes and extreme temperature differences encountered in working with liquid nitrogen. Even these special containers should be filled SLOWLY to minimize the internal stresses that occur when any material is cooled. Excessive internal stresses can damage the container.

Thermo Scientific -40C Lab Freezer A-1

Do not cover or plug the entrance opening of any liquid nitrogen refrigerator or dewar. Do not use any stopper or other device that would interfere with venting of gas.

These cryogenic liquid containers are generally designed to operate with little or no internal pressure.

Inadequate venting can result in excessive gas pressure which could damage or burst the container. Use only the loose-fitting necktube core supplied or one of the approved accessories for closing the necktube. Check the unit periodically to be sure that venting is not restricted by accumulated ice or frost.

Use proper transfer equipment.

Use a phase separator or special filling funnel to prevent splashing and spilling when transferring liquid nitrogen into or from a dewar or refrigerator. The top of the funnel should be partly covered to reduce splashing.

Use only small, easily-handled dewars for pouring liquid. For the larger, heavier containers, use a cryogenic liquid withdrawal device to transfer liquid from one container to another. Be sure to follow instructions supplied with the withdrawal device. When liquid cylinders or other large storage containers are used for filling, follow the instructions supplied with those units and their accessories.

Do not overfill containers.

Filling above the bottom of the necktube (or specified maximum level) can result in overflow and spillage of liquid when the necktube core or cover is placed in the opening.

Never use hollow rods or tubes as dipsticks.

When a warm tube is inserted into liquid nitrogen, liquid will spout from the top of the tube due to gasification and rapid expansion of liquid inside the tube.

Warning Nitrogen Gas Can Cause Suffocation Without Warning! s

Store and use liquid nitrogen only in a well-ventilated place.

As the liquid evaporates, the resulting gas tends to displace the normal air from the area. In closed areas, excessive amounts of nitrogen gas reduce the concentration of oxygen and can result in asphyxiation. Because nitrogen gas is colorless, odorless and tasteless, it cannot be detected by the human senses and will be breathed as if it were air. Breathing an atmosphere that contains less than 18% oxygen can cause dizziness and quickly result in unconsciousness and death.

Note The cloudy vapor that appears when liquid nitrogen is exposed to the air is condensed moisture; not the gas itself. The issuing gas is invisible. s

Never dispose of liquid nitrogen in confined areas or places where others may enter.

Disposal of liquid nitrogen should be done outdoors in a safe place. Pour the liquid slowly on gravel or bare earth where it can evaporate without causing damage. Do not pour the liquid on pavement.

A-2 -40C Lab Freezer Thermo Scientific

Appendix B

Handling Liquid CO

2

Warning High concentrations of CO

2 gas can cause asphyxiation! OSHA Standards specify that employee exposure to carbon dioxide in any eight-hour shift of a 40-hour work week shall not exceed the eight-hour time weighted average of 5000 PPM (0.5% CO 2 ). The short term exposure limit for 15 minutes or less is 30,000

PPM (3% CO

2

). Carbon dioxide monitors are recommended for confined areas where concentrations of carbon dioxide gas can accumulate. s

Store and use liquid CO

2 only in a well-ventilated place.

As the liquid evaporates, the resulting gas tends to displace the normal air from the area. In closed areas, excessive amounts of CO 2 gas reduce the concentration of oxygen and can result in asphyxiation. Because CO 2 gas is colorless, odorless and tasteless, it cannot be detected by the human senses and will be breathed as if it were air. Breathing an atmosphere that contains less than 18% oxygen can cause dizziness and quickly result in unconsciousness and death.

Note The cloudy vapor that appears when liquid CO

2 is exposed to the air is condensed moisture; not the gas itself. The issuing gas is invisible. s

Never dispose of liquid CO

2 in confined areas or places where others may enter.

Disposal of liquid CO 2 should be done outdoors in a safe place. Pour the liquid slowly on gravel or bare earth where it can evaporate without causing damage. Do not pour the liquid on pavement.

Appendix C

First Aid

If a person seems to become dizzy or loses consciousness while working with liquid nitrogen or carbon dioxide, move to a well-ventilated area immediately. If breathing has stopped, apply artificial respiration. If breathing is difficult, give oxygen. Call a physician. Keep warm and at rest.

If exposed to liquid or cold gas, restore tissue to normal body temperature (98.6° F) as rapidly as possible, followed by protection of the injured tissue from further damage and infection. Remove or loosen clothing that may constrict blood circulation to the frozen area. Call a physician. Rapid warming of the affected part is best achieved by using water at 108° F. Under no circumstance should the water be over 112° F, nor should the frozen part be rubbed either before or after rewarming. The patient should neither smoke nor drink alcohol.

Thermo Scientific -40C Lab Freezer A-3

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