7008920_-86C ULT Freezer

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Thermo Scientific

Revco

®

ExF -86C ULT Upright Freezer

Operating Manual 7008920 Rev. 0

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 Packing List

Catalog

Number

Model

Capacity

(cu ft)

Voltage/

Hz

ExF24086V 8920

ExF24086D 8921

ExF24086A 8922

ExF32086A 8923

ExF32086D 8924

ExF32086V 8925

ExF40086V 8926

ExF40086D 8927

ExF40086A 8928

ExF60086D 8929

ExF60086V 8930

13

13

13

17

17

17

23

23

23

28

28

230/50

230/50

230/60

120/60

230/60

230/50

230/50

230/60

120/60

120/60

230/60

Part

Number

Description

34040

122005

Key Ring

Key

Quantity

380520 Neoprene Cap 2

510016 1/4-20 x 5-1/2” Bolt 2

195763 Retaining Clip

370563

Remote Alarm

Connector

1

1

1

2

MANUAL NUMBER 7008920

0 FR-2202 7/14/11 Release 6 ccs

REV ECR/ECN DATE DESCRIPTION By

Thermo Scientific Revco ExF i

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.

©2011 Thermo Fisher Scientific. All rights reserved.

ii Revco ExF Thermo Scientific

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

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

Preface

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

Hot surface(s) present which may cause burns to unprotected skin, or to materials which may be damaged by elevated temperatures.

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 products will be available at www.thermofisher.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 Revco ExF iii

Preface iv Revco ExF

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]

Direct

Toll Free, U.S. and Canada

FAX

Internet Worldwide Web Home Page

Service E-Mail Address

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.

Thermo Scientific

Thermo Scientific

Table of Contents

Section 1

Section 2

Installation and Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

Control Panel Keys, Displays, Indicators . . . . . . . . . . . . . . . . . . . . . .1-4

Operation of the Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

Install Freezer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

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

Install Wall Bumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6

Remote Alarm Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6

Install Shelves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6

Connect Unit to Electrical Power . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

Attach Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

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

Set Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8

Set Low Temperature Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9

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

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

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

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

Temperature Stabilization Periods . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

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

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

High Stage System Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2

Section 4

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

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

Clean Cabinet Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

Clean Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

Clean Water-cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2

Defrost Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

Vacuum Relief Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

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

Prepare Unit for Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

Replace Battery(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5

PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . .4-6

Revco ExF v

Table of Contents

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

BUS - Back Up System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Install Vent Stack, Solenoid and Injection Assembly . . . . . . . . . . . .5-1

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

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

BUS Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

Set Optional BUS Set Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

Configure Optional BUS (Back-Up System) . . . . . . . . . . . . . . . . . .5-6

Test BUS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7

Clean Vent Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7

Disconnect Fitting Asm. and Transfer Hose . . . . . . . . . . . . . . . . . . .5-7

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

Recorder Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

Change Recorder Temperature Range . . . . . . . . . . . . . . . . . . . . . . .5-8

Installing the Chart Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

Water-cooled Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9

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

Single Door Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

Double Door Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3

Section 7

Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 - 1

Section 8

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

Section 9

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

Section 10

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

Appendix

Handling Liquid Nitrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A - 1

Handling Liquid CO

2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B - 1

First Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C - 1

vi Revco ExF Thermo Scientific

Thermo Scientific

Section 1

Installation and Start-up

Control Panel

Optional Back Up

System Controls

Temperature

Recorder

(Optional)

Figure 1-1. Freezer Front View Components

• Control panel - keypad, displays and indicators

• BUS (Optional Back Up System) control panel

• Optional temperature recorder or datalogger

Revco ExF 1-1

Section 1

Installation and Start-Up

Wall Bumper

(pre-tapped holes)

Optional Back-up

System Connections

Remote Alarm

Contacts

Power Inlet

Figure 1-2. Freezer Rear View Components

Power Switch

(mains disconnect)

• Remote alarm contacts

• Power inlet for power cord connection

• Optional BUS connections for probe and solenoid

• Power switch (mains disconnect)

Shelf

Bracket

Sealant

(Caution: This is a critical seal.

Seal must be maintained.)

Figure 1-3. Chamber Probe(s)

Optional Miscellaneous Accessories Probe

Optional - Recorder Probe/Datalogger Probe

Control RTD/Redundant Type T

Thermocouple Probe

1-2 Revco ExF Thermo Scientific

Vacuum

Relief Port

Section 1


Thermo Scientific

Chamber

Probe Cover

Figure 1-4. Vacuum Relief and Probe Cover Location

• Vacuum relief port - pressure equalization port

• Probe cover - houses control, optional recorder, datalogger, or 1535 alarm probes

Battery power switch

Thermocouple interconnect jack

Battery mounting bracket

O

Freezer battery and optional BUS battery

Figure 1-5. Battery(s) location and switch

• Battery mounting bracket(s)

• Battery power switch (freezer and BUS)

• Freezer battery

• Optional BUS battery

• Freezer filter location

To remove filter

Revco ExF 1-3

Section 1


Temperature Display

Mode Key

Alarm Indicator

Silence Key

Alarm Panel

Scroll for Parameters

Arrows

Up and Down

Arrows

Figure 1-6. Control Panel

Enter Key

Control Panel Keys,

Displays, Indicators

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

Alarm, Set Low Alarm, Calibrate, Backup.

• Temperature Display - Displays temperature in degrees Celsius.

• Scroll for Parameters Arrows - moves the operator through the choices of the selected mode.

• 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 - Increases or decreases values, toggles between choices.

• Enter - Stores the value into memory


Section 1


Operation of the

Keypad

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

Up Arrow: Increases or toggles the parameter value.

Enter: Must press Enter key to save to memory all changed values.

Down Arrow: Decreases or toggles the parameter value.

Silence Key: Press to silence the audible alarm. See

Section 4 for alarm ringback times.

Scroll for Parameters Arrows: Steps the operator through the parameters of SETTINGS, CALIBRATE and

CONFIGURATION Modes. Right arrow goes to the next parameter, left arrow returns to previous parameter.

Install Freezer

Note 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 a 7/16" wrench to remove all the bolts securing the shipping bracket to the pallet.

Remove the shipping bracket. Remove the ramp boards from the pallet and place the slotted end 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.

Thermo Scientific

Choose Location

The freezer can be easily pushed to the desired approved location, described below. 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.

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

Note 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

Locate the freezer on a firm, level surface in an area with an ambient temperature between 18°C and 32°C. Provide ample room to reach the mains disconnect switch (power switch) located on the rear of the freezer.

Revco ExF 1-5

Section 1


Install Wall Bumpers

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

Quantity

2

2

Stock # Description Purpose

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

380520 Neoprene Cap

Table 1-1. Parts bag

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.

Install Shelves

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

Note On units having the optional 5 inner door option, refer to the instructions accompanying the inner door kit. s

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 temperature or low temperature alarms. They will also trip on high stage, control probe or microboard failures.

Figure 1-8 shows the remote contacts in alarm state.

1-6 Revco ExF

Figure 1-8. Remote Alarm Contacts

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.

Thermo Scientific

Section 1


Attach Power Cord

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

Figure 1-9. Power Cord Connection

Connect Unit to Electrical

Power

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.

Note 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

Thermo Scientific Revco ExF 1-7

Section 1


Freezer Start-Up

With the freezer properly installed and connected to power, system set points can be entered. The following set points can be entered in Settings mode: Control temperature, high temperature alarm set point, low temperature alarm set point, and (optional) BUS set point. Default settings are shown in the table below.

Table 1-2. Default Settings

Default Settings

Control Set Point

High Temperature Alarm

Low temperature alarm

Optional BUS Set Point

Temperature

-80°C

-70°C

-90°C

-60°C

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

Set Operating

Temperature

Revco ExF freezers have an operating temperature range of -50°C to -86°C, depending on ambient temperature. The freezer is shipped from the factory with a temperature set point of -80°C. To change the operating temperature set point:

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 set point.

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


Section 1


Set High Temperature

Alarm

The high temperature alarm will activate an audible/visual warning when the freezer chamber temperature has reached or exceeded the high temperature alarm set point.

To set the high temperature alarm set point:

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 set point is displayed.

3. Press Enter to save the setting.


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

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

Set Low Temperature

Alarm

The low temperature alarm will activate an audible/visual warning when the freezer chamber temperature has reached or decrease below the low temperature alarm set point.

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 set point 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


Section 1


Run Mode

Run mode is the default mode for the freezer. This mode displays the cabinet temperature on the temperature display under normal operating conditions. In addition, the Run mode allows display of the high stage heat exchange temperature.

This information scrolls by pressing the up or down arrow keys. The display returns to the operating temperature in 10 seconds if no keys are pressed.


Section 2

Calibrate

Once the freezer has stabilized, the control probe may need to be calibrated. 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.

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

Calibrate Control

Probe

Plug a type T thermocouple reader into the receptacle located inside the lower door (see Figure 1-5). Compare the control temperature set point 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.

Temperature Stabilization

Periods

Startup - 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.

During calibration, the temperature display will not be available. s

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


Thermo Scientific

Section 3

Alarms

The Revco ExF alarms are displayed on the freezer control panel. When an alarm is active, the indicator next to the alarm description will light and an audible alarm will sound. 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.

Table 3-1. Alarm Indicators

Description Delay Ringback

Power Failure 1 min. 15 min.

High Temperature Alarm 1 min.

15 min.

Low Temperature Alarm 1 min.

Probe Failure see 3.2

1 min.

15 min.

15 min.

Door Open 1 min.

Wrong Power 0 min.

Low Battery* 1 min.

Low BUS Battery (optional)

Hot Condenser

High Stage Failure

Micro Board Failure

1 min.

1 min.

0 min.

0 min.

15 min. none

8 hours

15 min.

none

15 min.

15 min.

No

Yes

No

No

No

Yes

Yes

Relay

Yes

Yes

Yes

No

All alarm delays and ringback times are ±30 seconds.

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

Revco ExF 3-1

Section 3

Alarms

High Stage System

Failure

The "high stage system failure" condition is created when the high stage compressor and fans run for 30 minutes and are not capable of cooling the interstage heat exchanger to the proper temperature. Under this condition, the high stage compressor and fans will turn off after 30 minutes and an audible and visual alarm will occur. The audible alarm can be silenced and will ring back every 15 minutes.

Probe Failure Alarm

The microprocessor in Revco ExF 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 will occur as described above. If an error is detected with the control probe, the high and low stage compressors will run continuously. As a result, the cabinet temperature will decrease until it reaches the lowest temperature that the refrigeration system can maintain.

If an error is detected with the heat exchanger probe, the freezer will cycle properly at its temperature set point 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.


Erd1

ErE1

ErF1

Error

Er00

ErA1

ErC1

Erg1

ErH1

Section 3

Alarms

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 (180 < Vac < 270 for 230VAC unit / 85 <

Vac < 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.

Er03

Name: Heat Exchange Sensor Failure

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

Response: The display will show “Er03” only when the button sequence to read the heat exchange sensor is depressed.


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 system will have 10 minute staging between the high stage compressor and the low stage compressor activation.

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

Clean Cabinet Exterior

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.

Caution 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

Clean Air Filter

The air filter should be cleaned four times a year, minimum.

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.

Figure 4-1. Grille with Filter Location

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

Clean Condenser

The condenser should be cleaned once per year, minimum.

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

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.


Section 4

Maintenance

Clean Water-cooled

Condenser

The water-cooled condenser can be cleaned-in-place by using the CIP procedure. Cleaning solutions can be used, depending on type of deposits or build-up to be removed.

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

CIP (Clean-In-Place)

Procedure

1. Disconnect the unit from the water supply.

2. Drain the unit.

3. Rinse with fresh water and drain the unit again.

4. Fill with fresh water.

5. Add cleaning agent (solution and concentration dependent on deposits or build-up).

6. Circulate cleaning solution (if feasible).

7. Drain the cleaning solution.

8. Add and circulate a passivating liquid for corrosion inhibition of plate surfaces.

9. Drain this liquid.

10. Rinse with fresh water and drain.

11. Reconnect the water supply and fill the unit.

12. Return to service.


Section 4

Maintenance

Defrost Chamber

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 4-6.

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.

Clean Door Gasket

The door gasket should be cleaned monthly, minimum. 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.

Vacuum Relief Port

The exterior door gasket provides an excellent seal to protect product, provide an energy efficient thermal barrier to keep cold air in and room temperature air out, and reduce 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” that allows the pressure to be equalized.


Vacuum Relief Port

(continued)

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

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.

Warning Do not leave the freezer unattended while the door is unlatched.

The vacuum could release, resulting in a door opening and product loss.

s

Observe the inner side of port periodically 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.

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.

Warning Failure to maintain the vacuum relief port may result in excessive ice build up inside the tube, clogging the port, and 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


Section 4

Maintenance

Replace 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.

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

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

8. Close lower panel door.

Warning 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 the used batteries in a safe manner and in accordance with good environmental practices. s

Prepare Unit for

Storage

Defrost the unit as described in ‘Defrost Freezer’. This will prepare 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.

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

Battery power switch

Thermocouple interconnect jack

Battery mounting bracket

O re

Freezer battery and optional BUS battery

Figure 4-6. Battery Power Switch


Section 4

Maintenance

PREVENTIVE MAINTENANCE

Freezers

Your equipment has been thoroughly tested and calibrated before shipment. Regular preventive maintenance is important to keep your unit functioning properly. The operator should perform routine cleaning and maintenance on a regular basis. For maximum performance and efficiency, it is recommended that the unit be checked and calibrated periodically by a qualified service technician.

The following is a condensed list of preventive maintenance requirements. See the specified section of the instruction manual for further details.

We have qualified service technicians, using NIST traceable instruments, available in many areas. For more information on Preventive

Maintenance or Extended Warranties, please contact the Technical Services Department. Cleaning and calibration adjustment intervals are dependent upon use, environmental conditions and accuracy required.

Tips:

• Fill an upright by starting at the bottom near the probe and add racks to one shelf at a time. Allow freezer to recover to set point between shelves.

• Fill a chest by starting at the left side near the probe. Filling with room temperature racks will result in a long pull-down time.

• Fill unit with frozen product to help overall performance; frozen water jugs, for example.

• Always make certain the vacuum relief port is free of frost and ice, to allow for timely re-entry into the freezer after a door opening.

Action

Monthly Yearly

Every

2 Years

Verify ambient temperature, <90°F

* Adjust door handle for firm latching, as needed

Check and clean probe cover, gaskets, hinges and lid(s) of ice and snow. See

Figure 1-4 for probe location. See “Cleaning the Lid Gasket”.

4

4

4

More frequent cleaning may be required, depending on use and environmental conditions.

4

Check air filter. Clean or replace as needed. See “Cleaning the Air Filter”.

Check alarm back-up battery. See “Connecting the unit to Electrical Power” in

Section 1 and “Replacing the Battery” in Section 4.

4

**Replace

4

Check condenser fan motor for unusual motor noise or vibration.

* Verify and document calibration, at the minimum, annually. See Section 2

Calibration.

* Clean condenser compartment and wipe off condenser See “Cleaning the condenser” in Section 4.

4

* Qualified service technicians only

** Dispose of properly, according to all state and federal regulations.

To minimize ice build-up inside of freezer:

• Locate the freezer away from drafts or heating/cooling vents

• Keep the number of door openings to a minimum

• Minimize the length of time door is open

• Make sure door latches securely after opening


Section 5

Factory Installed Options

Back Up System (BUS)

- P/N 1950533, 1950535

Note 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) maintains 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.

Install Vent Stack, Solenoid and Injection Assembly

1. Install the injection assembly through the 1/2” pre-punched 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 through the opening and secure it to the top of the freezer, using screws.


Section 5

Factory Installed Options

Install Vent Stack, Solenoid and Injection (continued)

Figure 5-1. Injection Assembly

5-2 Revco ExF

Figure 5-2. Vent Stack Assembly

Thermo Scientific

Section 5


Install Vent Stack, Solenoid and Injection (continued)

7. Inside the chamber, seal around the end of the vent stack with

Permagum.

8. Install the transfer hose connecting one end to the injection assembly, the other to the solenoid valve. Connect the solenoid valve to the supply source. The solenoid mounting bracket may be discarded.

Note When selecting a CO

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

Install 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).

195419

Probe Mounting

Bracket

30037

Small Tie

Wrap

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.

290167

Back-Up Probe

Figure 5-3. Secure probe

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.

Thermo Scientific

Figure 5-4. Mounted probe clip

Revco ExF 5-3

Section 5


Tie wrap anchor

Probe wire

Spade lug connections to solenoid

BUS connection

Remote Alarm

Contacts

Power Outlet

Power switch

(mains disconnect)

Figure 5-5. Probe wire and solenoid connections

Connect 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.


Section 5


BUS Control Panel

The following section describes the configuration and operation of the

BUS.

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

Figure 5-6. BUS Control Panel

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


Section 5


Configure Optional BUS

(Back-Up System)

The optional BUS can be configured for LN2 or CO2 supply. To select the supply type:

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

2. Press the up or down arrow key. The display will show “cO2” or

“Ln2” for selection.



If no control keys are pressed, the freezer will automatically return to to

RUN mode after 5 minutes.

Set Optional BUS Set

Point

The optional back up system is designed to inject CO2 or LN2 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 to

RUN mode after 5 minutes.

Warning 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

Note The BUS set point can not be set any colder than the high temperature alarm set point. (See Section 1 - “Setting the High

Temperature Alarm). 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


Section 5


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 the 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.

Disconnect Fitting Asm.

and 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

The following section describes the set up and operation of the optional chart recorder.

Thermo Scientific

Figure 5-7. Recorder Details

Revco ExF 5-7

Section 5


Installing the Chart Paper

1. Open the plastic 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. 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.

Change Recorder

Temperature Range

The chart recorder contains eight factory programmed temperature ranges. To change the recorder range:

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.

4

5

6

7

8

Program From To

1

2

3

-40

0

-100

30°C

60°C

38°C

-5

0

-100

-115

-10

50°C

100°C

200°C

50°C

70°C

3. Release button and the green LED begins 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.

Recorder Calibration

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

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

3. 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. The ink will appear to fade before replacement becomes necessary. Additional pen tips may be purchased from Thermo. s


Section 5


Water-cooled

Condenser

The water-cooled condenser is a factory installed option (195964 [13 cu ft], 195965 [17, 23, 28 cu ft], 195967 [12, 17, 20 cu ft chest]) and requires a qualified technician at freezer installation. Installation should include proper adjustment of the regulating valve, which controls the discharge pressure. Refer to Table 5-1 for the specifications for this option.

Table 5-1. Water-Cooled Condenser Specifications

Water Source

Water Pressure

Water Temperature Range

Inlet Connection

Outlet Connection

Flow Rate Required

Drain Required

Tower

Not to exceed 150 psig

Not to exceed 29.4C (85F)

0.5” compression

0.5” compression

3.0 gallons (11.4 liters) per minute

No (return line is required)

City

1.0 gallon (3.8 liters) per minute

Yes


Section 6

Specifications

Number (Model) ExF24086V (8920) ExF24086D (8921)


-50°C(-58°F) to -86°C(-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient

Exterior Dimensions

33.3”W x 77.9” H x 32.9” F-B

(84.6cm x 197.9cm x 83.6cm)

33.3”W x 77.9” H x 32.9” F-B

(84.6cm x 197.9cm x 83.6cm)

Interior Dimensions

23.0”W x 51.5”H x 19.3” F-B

(58.4cm x 130.8cm x 49.0cm)

23.0”W x 51.5”H x 19.3” F-B

(58.4cm x 130.8cm x 49.0cm)

Capacity

13.0 cu. ft. (368.1 liters)

Refrigeration

Two 1 HP (2545 BTUH each)

Insulation

ExF24086A (8922)

33.3”W x 77.9” H x 32.9” F-B

(84.6cm x 197.9cm x 83.6cm)

23.0”W x 51.5”H x 19.3” F-B

(58.4cm x 130.8cm x 49.0cm)

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

Electrical -

nominal voltage ±10%

230VAC, 50 Hz, 12.0 FLA

Operating Range: 208VAC-240VAC

Breaker Requirements

15 Amp, Dedicated Circuit,

15 Amp Time Delay Breaker

Shipping Weight

711 lbs. (323kg)

230VAC, 60 Hz, 12.0 FLA




120VAC, 60 Hz, 16.0 FLA




Number (Model) ExF32086A (8923) ExF32086D (8924)




33.3”W x 77.9” H x 38.9” F-B

(84.6cm x 197.9cm x 94.0cm)

33.3”W x 77.9” H x 38.9” F-B

(84.6cm x 197.9cm x 94.0cm)


23.0”W x 51.5”H x 25.3” F-B

(58.4cm x 130.8cm x 64.3cm)

23.0”W x 51.5”H x 25.3” F-B

(58.4cm x 130.8cm x 64.3cm)

Capacity

17.3 cu. ft. (489.9 liters)

Refrigeration


ExF32086V (8925)

33.3”W x 77.9” H x 38.9” F-B

(84.6cm x 197.9cm x 94.0cm)

23.0”W x 51.5”H x 25.3” F-B

(58.4cm x 130.8cm x 64.3cm)

Insulation


Electrical -

nominal voltage ±10

120VAC, 60 Hz, 16.0 FLA





Shipping Weight

830 lbs. (376kg)

230VAC, 60 Hz, 12.0 FLA




230VAC, 50 Hz, 12.0 FLA





Section 6

Specifications

Number (Model) ExF40086V (8926) ExF40086D (8927)




40.8”W x 77.9” H x 38.9” F-B

(103.6cm x 197.9cm x 94.0cm)

40.8”W x 77.9” H x 38.9” F-B

(103.6cm x 197.9cm x 94.0cm)


30.6”W x 51.5”H x 25.3” F-B

(77.7cm x 130.8cm x 64.3cm)

30.6”W x 51.5”H x 25.3” F-B

(77.7cm x 130.8cm x 64.3cm)

Capacity

Refrigeration

Insulation

23.0 cu. ft. (651.3 liters)


ExF40086A (8928)

40.8”W x 77.9” H x 38.9” F-B

(103.6cm x 197.9cm x 94.0cm)

30.6”W x 51.5”H x 25.3” F-B

(77.7cm x 130.8cm x 64.3cm)


Electrical -


Breaker

Requirements

Shipping Weight

230VAC, 50 Hz, 12.0 FLA


15 Amp Dedicated Circuit,


879 lbs. (399kg)

230VAC, 60 Hz, 12.0 FLA




120VAC, 60 Hz, 16.0 FLA




Number (Model) ExF60086D (8929) ExF60086V (8930)


-50°C (-58°F) to -86°C (-123°F) in an 18C to 32C * (64.4F to 89.6F) ambient


46.8”W x 77.9” H x 38.9” F-B

(118.9cm x 197.9cm x 94.0cm)

46.8”W x 77.9” H x 38.9” F-B

(118.9cm x 197.9cm x 94.0cm)


Capacity

Refrigeration

36.6”W x 51.5”H x 27.0” F-B

(93.0cm x 130.8cm x 68.6cm)

28.0 cu. ft. (792,8 liters)


36.6”W x 51.5”H x 27.0” F-B

(93.0cm x 130.8cm x 68.6cm)

28.0 cu. ft. (792,8 liters)

Insulation

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

Electrical -


230VAC, 60 Hz, 12.0 FLA


230VAC, 60 Hz, 12.0 FLA





Shipping Weight

1090 lbs. (494kg)



1090lbs. (494kg)


Thermo Scientific

Section 6

Specifications

Certifications

Declaration of Conformity is 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.

Revco ExF 6-3

Section 7

Parts

Thermo Scientific

Exploded Drawing

Heat Exchanger

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Exploded Drawing

Single Door Assy

Upright Freezer

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Section 7

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Exploded Drawing

Single Door Assy

Upright Freezer

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Parts


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230V Relay Enclosure

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Refrigeration Schematics


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Section 9

Electrical Schematics

Thermo Scientific

Electrical Schematic

230V

ULT Freezers

902-70-2-D Rev. 1

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Section 9


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Section 10

Warranty Information

ISO 9001


Section 10

Warranty Information

ISO 9001


Thermo Scientific

Appendix A

Handling Liquid Nitrogen

Warning Contact of liquid nitrogen or cold gas with the 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.

Revco ExF A -1

Appendix A

Handling Liquid Nitrogen

Introduction

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.

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 loosefitting 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.

A -2 Revco ExF Thermo Scientific

Thermo Scientific

Appendix A


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.

Revco ExF A -3

Appendix B

Handling Liquid CO

2

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 eighthour 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.


Thermo Scientific

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.

Revco ExF A -5

Appendix A



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