Esco Lexicon, Lexicon UUS-668A-1 User Manual

User
Manual

Thank you for purchasing this Esco Ultra-Low Temperature

Freezer. Please read this manual thoroughly to familiarize
yourself with the many unique features and exciting
innovations we have built into your new equipment. Esco
provides many other resources at our website,
www.escoglobal.com, to complement this manual and help you
enjoy many years of productive and safe use of your Esco

products.

Esco Technologies, Inc.
2940 Turnpike Drive, Units 15-16 • Hatboro, PA 19040, USA
Toll-Free USA and Canada 1-877-479-3726
Tel [phone] • Fax [phone]
us.escoglobal.com • [email protected]

Esco Micro Pte. Ltd.

21 Changi South Street 1 • Singapore 486 777
Tel [phone] • Fax [phone]

www.escoglobal.com • [email protected]

Copyright Information

© Copyright 2011 Esco Micro Pte. Ltd. All rights reserved.

The information contained in this manual and the accompanying product is copyrighted and all rights are

reserved by Esco.

Esco reserves the right to make periodic minor design changes without obligation to notify any

person or entity of such change.

Lexicon® is a registered trademark of Esco.

“Material in this manual is provided for informational purposes only. The contents and the product described in

this manual (including any appendix, addendum, attachment or inclusion), are subject to change without
notice. Esco makes no representations or warranties as to the accuracy of the information contained in this
manual. In no event shall Esco be held liable for any damages, direct or consequential, arising out of or related
to the use of this manual.”

Ultra-Low Temperature Freezer

i

Introductory Page

i

Table of Contents

iii

Warranty Terms and Conditions

v

Introduction

v

1. Products Covered

v

2. Safety Warning

v

3. Limitation of Liability

v

4. European Union Directives on WEEE and RoHS

vii

Declaration of Conformity

1

Chapter 1 – Product Information

1

1.1 About Lexicon Ultra-Low Temperature Freezers

1

1.2 Labels

2

1.3 Quick View

2

1.3.1 Front Quick View

3

1.3.2 Back Quick View

5

Chapter 2 – Installation

5

2.1 General Requirements

5

2.1.1 Location Requirements

6

2.1.2 Environmental Requirements

6

2.1.3 Power Requirements

6

2.2 Installation

6

2.2.1 Unit Leveling

7

2.2.2 Shelves Installation

8

2.2.3 Omega Brackets Installation

8

2.2.4 Remote Alarm Contacts Connection

8

2.2.5 Electrical Supply Connection and Power Protection Bracket Installation

9

2.3 First Run

9

2.4 Disclaimer

11

Chapter 3 – Control System and Operation

11

3.1 Freezer Control System

11

3.2 Temperature Offset Calibration

12

3.3 Set Temperature & Hysteresis

12

3.4 Operating the Freezer

12

3.4.1 Products Loading

12

3.4.2 Opening and Closing the Door

12

3.4.3 Locking the Main Door

13

3.5 Alarm

13

3.5.1 High Temperature Alarm

13

3.5.2 Power Failure Alarm

15

Chapter 4 – General Maintenance

15

4.1 Scheduled Maintenance

15

4.2 General Cleaning

15

4.3 Condenser Cleaning

15

4.4 Air Filter Cleaning

16

4.5 Door Gasket Cleaning

16

4.6 Vacuum Relief Port Cleaning

16

4.7 Defrost and Cleaning

16

4.8 PF Battery Checking

16

4.9 Preparing the Unit for Storage

16

4.10 Maintenance/Service Log

ii

17

Chapter 5 – Accessories Installation

17

5.1 LCO2/LN2 Backup System

17

5.2 Chart Recorder

19

Chapter 6 – Troubleshooting

21

Chapter 7 – Engineering Details

21

7.1 Engineering Drawing

22

7.2 General Specifications

Appendix

Ultra-Low Temperature Freezer

iii

Esco products come with either a 1, 2 or 3 year limited warranty, depending on the product purchased,
beginning on the date of shipment from any Esco international warehousing location. To determine which
warranty applies to your product, refer to the appendix below.

Esco's limited warranty covers defects in materials and workmanship. Esco's liability under this limited
warranty shall be, at our option, to repair or replace any defective parts of the equipment, provided if proven
to the satisfaction of Esco that these parts were defective at the time of being sold, and that all defective parts
shall be returned, properly identified with a Return Authorization.

This limited warranty covers parts only, and not transportation/insurance charges.

This limited warranty does not cover:

Freight or installation (inside delivery handling) damage. If your product was damaged in transit, you

must file a claim directly with the freight carrier.

Products with missing or defaced serial numbers.
Products for which Esco has not received payment.
Problems that result from:

o External causes such as accident, abuse, misuse, problems with electrical power, improper

operating environmental conditions.

o Servicing not authorized by Esco.
o Usage that is not in accordance with product instructions.
o Failure to follow the product instructions.
o Failure to perform preventive maintenance.
o Problems caused by using accessories, parts, or components not supplied by Esco.
o Damage by fire, floods, or acts of God.
o Customer modifications to the product

Consumables such as filters (HEPA, ULPA, carbon, pre-filters) and fluorescent / UV bulbs.
Esco is not liable for any damage incurred on the objects used on or stored in Esco equipment. If the

objects are highly valuable, user is advised to have in place independent external preventive
measures such as connection to a centralized alarm system.

Factory installed, customer specified equipment or accessories are warranted only to the extent guaranteed by
the original manufacturer. The customer agrees that in relation to these products purchased through Esco, our
limited warranty shall not apply and the original manufacturer's warranty shall be the sole warranty in respect
of these products. The customer shall utilize that warranty for the support of such products and in any event
not look to Esco for such warranty support.

Esco encourages all users to register their equipment online at www.escoglobal.com/warranty or complete the
warranty registration form included with each product.

ALL EXPRESS AND IMPLIED WARRANTIES FOR THE PRODUCT, INCLUDING BUT NOT LIMITED TO ANY IMPLIED
WARRANTIES AND CONDITIONS OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
LIMITED IN TIME TO THE TERM OF THIS LIMITED WARRANTY. NO WARRANTIES, WHETHER EXPRESS OR
IMPLIED, WILL APPLY AFTER THE LIMITED WARRANTY PERIOD HAS EXPIRED. ESCO DOES NOT ACCEPT LIABILITY
BEYOND THE REMEDIES PROVIDED FOR IN THIS LIMITED WARRANTY OR FOR SPECIAL, INDIRECT,
CONSEQUENTIAL OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, ANY LIABILITY FOR THIRD­PARTY CLAIMS AGAINST YOU FOR DAMAGES, FOR PRODUCTS NOT BEING AVAILABLE FOR USE, OR FOR LOST
WORK. ESCO'S LIABILITY WILL BE NO MORE THAN THE AMOUNT YOU PAID FOR THE PRODUCT THAT IS THE
SUBJECT OF A CLAIM. THIS IS THE MAXIMUM AMOUNT FOR WHICH ESCO IS RESPONSIBLE.

iv

These Terms and Conditions shall be governed by and construed in accordance with the laws of Singapore and
shall be subject to the exclusive jurisdiction of the courts of Singapore.

Technical Support, Warranty Service Contacts
USA: 1-877-479-3726
Singapore: [phone]
Global Email Helpdesk: [email protected]
Visit http://www.escoglobal.com/ to talk to a Live Support Representative
Distributors are encouraged to visit the Distributor Intranet for self-help materials.

Product Appendix, Warranty Listings

Biological Safety Cabinets, Laminar Flow Cabinets,
HEPA-Filtered Cabinets (except Streamline brand)

The warranty periods for BSC may vary by country. Contact
your local distributor for specific warranty details.

Laboratory Fume Hoods

1 year limited.

Ductless Fume Hoods

3 years limited for Ascent Opti's, 5 years for Ascent Max's.

Cleanroom Equipment

1 year limited.

Laboratory Ovens and Incubators

1 year limited.

CO2 Incubators

2 years limited.

Containment/Pharma Products

2 years limited.

Ultralow Temperature Freezer

3 years limited. 60 months on Compressor.

The warranty period starts two months from the date your equipment is shipped from Esco facility for
international distributors. This allows shipping time so the warranty will go into effect at approximately the
same time the equipment is delivered to the user. The warranty protection extends to any subsequent owner
during the warranty period. Distributors who stock Esco equipment are allowed an additional four months for
delivery and installation, providing the product is registered with Esco. User can register product online at
www.escoglobal.com/warranty or complete the warranty registration form included with each product.

Policy updated on 12th Apr 2011 (This limited warranty policy does not apply to products purchased before 12th
Apr 2011)

Ultra-Low Temperature Freezer

v

1. Products Covered

Lexicon Ultra-Low Temperature Freezer

Model

Storage Volume

Temperature Range

Freezer Control

UUS-668A-1

668.8 Liter / 23.6 ft3

-50oC to -86oC

Industrial Digital Controller

Power rating for all models is 230 VAC, 50 Hz, 1 Φ

2. Safety Warning

Anyone working with, on or around this equipment should read this manual. Failure to read,

understand and follow the instructions given in this documentation may result in damage to the unit,
injury to operating personnel, and / or poor equipment performance.

Any internal adjustment, modification or maintenance to this equipment must be undertaken by

qualified service personnel.

The use of any hazardous materials in this equipment must be monitored by an industrial hygienist,

safety officer or some other suitably qualified individual.

Before you proceed, you should thoroughly understand the installation procedures and take note of

the environmental / electrical requirements.

In this manual, important safety related points will be marked with the symbol.
If the equipment is used in a manner not specified by this manual, the protection provided by this

equipment may be impaired.

3. Limitation of Liability

The disposal and / or emission of substances used in connection with this equipment may be governed by
various local regulations. Familiarization and compliance with any such regulations are the sole responsibility
of the users. Esco’s liability is limited with respect to user compliance with such regulations.

4. European Union Directive on WEEE and RoHS

The European Union has issued two directives:

• Directive 2002/96/EC on Waste Electrical and Electronic Equipment (WEEE)
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 following
symbol:
Esco sells products through distributors throughout Europe. Contact your local Esco
distributor for recycling/disposal.

• Directive 2002/95/EC on Restriction on the use of Hazardous Substances (RoHS)
With respect to the directive on RoHS, please note that this freezer falls under category 8 (medical devices)
and category 9 (monitoring and control instruments) and is therefore exempted from requirement to comply
with the provisions of this directive.

vi

Ultra-Low Temperature Freezer

vii

Declaration of Conformation

In accordance to EN ISO/IEC 17050-1:2010

We, Esco Micro Pte. Ltd.
of 21 Changi South Street 1
Singapore, 486777
Tel: [phone]
Fax: [phone]

declare on our sole responsibility that the product:
Category : Ultra-Low Temperature Freezer

Brand : Lexicon

Model : UUS-668A-1

in accordance with the following directives:

2006/95/EEC : The Low Voltage Directive and its amending directives
92/31/EEC : The Electromagnetic Compatibility Directive and its amending

directives

has been designed to comply with the requirement of the following Harmonized Standard:

Low Voltage : EN 61010-1:2010
EMC : EN 61326-1:2006 Class B

More information may be obtained from Esco’s authorized distributors located within the European Union. A
list of these parties and their contact information is available on request from Esco.

_______________________________

XQ Lin

Group CEO, Esco
(Feb 23rd,2011)

This Declaration of Conformity is only applicable for 230V AC 50Hz units

viii

1

Ultra-Low Temperature Freezer

-

1.1 About Lexicon™ Ultra-Low Temperature Freezers

Esco Lexicon™ ultra-low temperature freezers are designed to store critical biological samples, agents and
general non-flammable laboratory materials at a temperature range of -50oC to -86oC. Among many features
and characteristics, long term reliability of the freezers to sustain the required cold temperature, low sound
level and low energy consumption are priorities. The freezer units feature a simple microprocessor control
that allows an easy and direct set point control, a heavy duty latch for secure door seal, and four adjustable
shelves of 45.36 kg (100 lbs.) capacity each.

ESCO Lexicon™ ULT’s are manufactured with the best manufacturing techniques and highest standards known
in the field of specialty refrigeration equipment.

1.2 Labels

Model – model of the unit

Serial – the unit’s serial number
Manufactured in … - year of manufacture
Electrical – electrical requirement
Refrigerant Charge:
First Stage – amount, type and charge pressure of refrigerant
charging
Second Stage – amount, type and charge pressure of refrigerant
charging

2

1.3 Quick View

1.3.1 Front Quick View

1. Main Handle

2. Vacuum Relief

3. Inner Door

4. Embedded Pulls

5. Inner Doors Magnet

6. Shelves

7. Access Port

8. Control Panel

9. Air Vents / Intakes

10. Caster Wheel with Adjustable Foot

11. Cabinet Support

12. Control Probe

13. Power Failure (PF) Battery Location

14. PF Battery Disconnect Switch

3

Ultra-Low Temperature Freezer

1.3.2 Back Quick View

1. Main Switch

2. Power Inlet

3. Remote Alarm Contact

4. Power Protection Bracket

1

2 3 4

4

5

Ultra-Low Temperature Freezer

–

2.1 General Requirement

2.1.1 Location Requirements

Install the unit on a firm and level floor in an indoor environment.

Allow at least 150 mm (6”) of open space on all sides from the sides, top and rear.

The location should be sufficiently ventilated so the heat from the unit can be removed from the area

to prevent any potential overheating condition of the ambient temperature.

Avoid installing a unit in an area with direct heat source such as sunlight, heat radiator, and other

heat sources.

6

2.1.2 Environmental Requirements

Indoor use
Altitudes of up to 2000 meters (6600’)
Up to 90% relative humidity – non-condensing
Temperature between 15

O

C - 32OC (59OF - 90OF)

Note: Recommended operating temperature is 25oC (77oF).

Must be installed in room with sufficient ventilation. The room ventilation should be a technical

ventilation that is in accordance with the requirements of ZH 1/119 (Guidelines for laboratories) or
some other suited ventilation system with appropriate capacity.

2.1.3 Power Requirements

Designed for 230 VAC 50Hz 1Φ electrical rating
An unobstructed dedicated power outlet which is not shared with other appliances.
Installation Category: II

Note: Installation category (over voltage category) defines the level of transient over voltage which the
instrument is designed to withstand safely. It depends on the nature of the electricity supply and its over voltage
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 over voltage is 2500 V for a 230 V supply and 1500 V for a 120 V supply.

Performance criteria B in voltage dips & short interruptions immunity test.

Note: During the voltage dips & short interruptions immunity test, flicker of the fluorescent light was observed
when the voltage dips and short interruption were being applied on the AC mains port of the equipment and self­recovered after the test.

It is recommended that the voltage fluctuation doesn't exceed ±10% of the nominal voltage at all

times, or else an electrical power stabilizer can be installed.

UPS is recommended for better protection. If UPS is not used and there is a power failure, the

operator must take immediate action to prevent the danger of potential warm-up.

2.2 Installation

2.2.1 Unit Leveling

It is important that the equipment is properly leveled by positioning a bubble level on the middle shelf of the
freezer. The freezer has built in leveling feet for adjustment. To raise a corner with a leveling foot, use a cross
wrench to turn the leveling leg that appears to be in a low position in the counterclockwise direction.

Leveling feet

Caster Wheel

7

Ultra-Low Temperature Freezer

2.2.2 Shelves Installation

To change the position of the shelves, remove and re-install the pilaster clips (front and back) at desired shelf
level.

1. Open main door

2. Open all inner doors

3. Rotate shelf 45o vertically

4. Slide the shelf into the freezer chamber – on
top of the pilasters

5. Ensure the pilaster clips go through the holes

on the shelf

1. Put the first hook (1) into the pilaster hole

(4a)

2. Press upwards, then put the second hook
(2) into the pilaster hole (4b)

3. Install the shelf by aligning the third hook
(3) with the shelf hole - hole located
underneath the shelf (5)

1

2

3

4a

5

4b

8

2.2.3 Omega Brackets Installation

Omega brackets are used to ensure the required distance from the wall is maintained.

2.2.4 Remote Alarm Contacts Connection

External alarm can be connected to the remote alarm
contacts located at the back of the freezer base above
the power cord. These remote alarm contacts will
transmit a DC voltage upon occurrence of a high
temperature (HA) and power failure (PF) alarm. The
contacts provide 12 VDC (+) and (-) connectivity.

2.2.5 Electrical Supply Connection and
Power Protection Bracket Installation

Plug the power cord (1) into the power inlet at the
rear of the unit. Turn on the power switch (2). Install
the power protection bracket (3) over the power cord
and power switch by installing the 3 screws into the
pre-tapped holes.

1. Attach the bracket(1) to its place – sync the hole in

the bracket(1) to the hole in the unit

2. Screw the M6 bolts into the designated place (the
holes on top and below the bracket(1))

3. Repeat the 2 steps above with the other bracket(1)

1

2

1

3

9

Ultra-Low Temperature Freezer

2.3 First Run (Also required whenever the freezer is turned off or moved)

Before activating the unit for the first time, ensure that there’s no object other than the shelves inside the

freezer.

Turn on the power switch. The controller will light up. The first stage compressor gets the power and starts
working. When the heat exchanger inside the freezer becomes cold enough and reaches a predetermined
temperature, the second stage compressor starts. The unit continues to operate until it reaches the set
temperature.

Lexicon™ Ultra-Low Temperature freezers have an operating temperature of -50 °C to -86 °C, depending on
the ambient temperature. The freezer is shipped from the factory with a temperature set point of -80 °C. Refer
to section 3.2 to change temperature setting.

ULTF S-series controller has 2 switches for alarms located behind the right bottom door.

Once the unit reaches set point temperature, open the outer and the inner doors to load in half of the racks.
In the process of doing so, the freezer temperature is expected to warm up. Let the unit recover to the set
temperature then load in the rest of the racks.

If the freezer does not require any racks, let the unit run at set point for at least 48 hours for observation
before placing any products inside the unit.

2.4 Disclaimer

The performance and safety of the freezer, while rigorously evaluated at the factory, cannot be guaranteed
after transit and installation. Therefore the on-site testing is always recommended.

Power failure alarm

High temperature alarm

Power failure switch should always be turned on when the

unit runs. (Warning: Make sure the scheduled maintenance for

PF battery is carried out; refer to chapter 4, to ensure the battery
stays charged when the unit is on).

On the other hand, high temperature alarm switch should
remain off during initial start-up run in order to avoid
nuisance alarm beeping during pull down. It should only be
turned on once the unit has reached the temperature set

point.

10

11

Ultra-Low Temperature Freezer

-

3.1 Freezer Control System

LED K1, K2

LED K2 lit up when respective relay connected to high/low temperature alarm energized
LED K1 lit up when the respective relay connected to 1

st

stage compressor energized

START/STOP Button

To start/stop the freezer operation

PROGRAMMING (P) button

To set up freezer’s programming

UP and DOWN button

To increase or decrease a value in the menu options

3.2 Temperature Offset Calibration

The control probe may need to be calibrated once the unit has passed the stabilization period. A good
laboratory practice would require at least annual calibration check.

Calibrating the Control Probe

Place a calibrated temperature recording instrument next to the PT100 sensor located inside the sensor cover
at the bottom right corner of the cabinet. Allow the freezer to stabilize for at least 2 hours if the unit has been
in service or at least 12 hours if the freezer is being started up for the first time. Compare the calibrated
temperature reading to the freezer display temperature. The offset value is determined by the difference
between the two readings.

Warning: It is imperative that only properly calibrated reference instruments should be used for calibration

Step

Action

Press

Display Show

First

Second

1

Press “P” key for 3 seconds (the second display shows

chamber temperature; eg: 15oC)

P

15

2

Set code 72 for accessing the parameter level by using the ▼
and ▲keys

▼and ▲



72

3

Press “P” key until offset

P

4

Set the offset value by using the ▼ and ▲keys (the second
display shows offset point; eg: 0oC)

▼and ▲



0.0

6

Press “P” key to confirm

P

7

Allow some time for the instrument to switch back to the
process value display

K1 LED

UP button

DOWN button

K2 LED

START/STOP button

PROGRAMMING (P) button

12

Temperature Stabilization Periods

- Startup – Allow 12 hours for the temperature in the cabinet to stabilize before proceeding with

calibration

- Already Operating – Allow at least 2 hours after the display reaches set point temperature to stabilize

before proceeding with calibration

3.3 Set Temperature & Hysteresis

The freezer is shipped from factory with temperature set point -80oC and hysteresis 1oC. The LCD screen will
blink between the first and the second display

Step

Action

Press

Display Show

First

Second

1

Press “P” key for 3 seconds (the second display shows
chamber temperature; eg: 15oC)

P

15

2

Set code 72 for accessing the parameter level by using the ▼
and ▲keys

▼and ▲



72

3

Press “P” key to set the temperature

P

4

Set the temperature value by using the ▼ and ▲keys (the
second display show set point temperature; eg: -80oC)

▼and ▲



-80

Press “P” key to set the hysteresis

P

6

Set the hysteresis value by using the ▼ and ▲keys (the
second display show set point hysteresis; eg: 1oC)

▼and ▲



1

7

Press “P” key to confirm

P



8

Allow some time for the instrument to switch back to the
process value display

3.4 Operating the Freezer

3.4.1 Product Loading

Loading of warm product into the freezer should be done in batches. Do not fill the freezer with product of
more than 25 percent of the volume at one time as this process might introduce too much heat load into the
freezer. Allow freezer to stabilize. Once the temperature of the freezer returns to the set point, another batch
of product can be loaded in.

Fill an upright by starting at the bottom near the probe and add products to racks to one shelf at a

time, allow freezer to recover to set point or temperature between shelves

Fill empty shelves with frozen water jugs, for example, to help overall performance
Always make sure the vacuum relief port is free of frost and ice, to allow for timely re-opening of the

main door.
ESCO ULTs are designed for long term storage. It is recommended that only pre-frozen products be placed in
the unit as that will reduce the amount of heat load that must be absorbed by the freezer at one time.

3.4.2 Opening and Closing Doors

Main door and inners doors should be closed tightly at all times. When taking the samples out, open the main
door and then open only one inner door at a time.

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Ultra-Low Temperature Freezer

3.4.3 Locking the Main Door

Main door can be locked with the standard key set provided.

3.5 Alarm

3.5.1 High/Low Temperature Alarm

If ‘Set Point” is changed, the ‘Alarm High’ and ‘Alarm Low’ will also change. To modify the alarms:

Step

Action

Press

Display Show

First

Second

1

Press “P” key for 3 seconds (the second display shows

chamber temperature; eg: 15oC)

P

15

2

Set code 72 for accessing the parameter level by using the ▼
and ▲keys

▼and ▲



72

3

Press “P” key to set the temperature

P

4

Set the temperature value by using the ▼ and ▲keys (the
second display show set point temperature; eg: -80oC)

▼and ▲



-80

5

Press “P” key until r.2

P

6

Set the r.2 value by using the ▼ and ▲keys

▼and ▲



1

7

Press “P” key to set the Alarm Low

P

8

Set the Alarm Low value by using the ▼ and ▲keys (the
second display show temperature; eg: -90oC)

▼and ▲



-90

9

Press “P” key to set the Alarm High

P

10

Set the Alarm High value by using the ▼ and ▲keys (the
second display show temperature; eg: -70oC)

▼and ▲



-70

11

Press “P” key to set the hysteresis

P

12

Set the hysteresis value by using the ▼ and ▲keys (the
second display show set point hysteresis; eg: 1oC)

▼and ▲



1

13

Press “P” key to confirm

P

14

Allow some time for the instrument to switch back to the
process value display

3.5.2 Power Failure Alarm

Power failure switch should always be turned on when the unit runs. Refer to section 2.3 for details.

14

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Ultra-Low Temperature Freezer

-

4.1 Scheduled Maintenance

Proper and timely maintenance is crucial for trouble free functioning of any device and your Esco ULTF is no
exception to this rule. We strongly recommend that you follow the maintenance schedule suggested
hereunder in order to obtain optimal performance from your Esco ULTF.

No.

Description of Task to Perform

Maintenance to be carried out every

1 Month

3 Month

6 Month

As Needed

1

Door gasket cleaning

√

2

PF battery checking

√

3

Air filter cleaning

√

4

Condenser cleaning

√

5

Vacuum relief port cleaning

√

6

General cleaning

√

7

Defrost and cleaning

√

8

Replace battery(s)

√

Above is the minimum frequency. More frequent maintenance is required depending on actual condition of the freezer.

4.2 General Cleaning

Routine cleaning of freezer should be carried out. The surfaces can be cleaned by wiping down with clean
water and a mild detergent using a sponge.

4.3 Condenser Cleaning

Cleaning the condenser is one of the most important tasks
to ensure the unit operates properly and efficiently. A
clogged condenser often results in poor performance and
raised power consumption. In some cases, clogged
condenser can choke the system’s air intake and cause
severe damage to the compressors.

To clean the condenser, pull open the left and right bottom
doors. Use a household type of vacuum cleaner to vacuum
the fins. Make sure you can clearly see through the fins
after the vacuum operation is completed.

The condenser should be cleaned once every 6 months or
more frequently if the area is dusty.

4.4 Air Filter Cleaning

The air filters are the first line of defense against dust and
dirt that might be pulled into the condenser. It is necessary
to inspect and clean the air filters on a regular basis.

To clean the air filter, open both left and right bottom
doors, there are two air filters installed. Remove the
condenser air filter, and wash it in water. Dry it out and

place it back in the air filter holders.

The air filter condition should be inspected and washed once in every 3 months. Replace the filter if it is too
dirty or worn out.

Air Filter1

Condenser

Air Filter2

Left Bottom Door

Right Bottom Door

16

4.5 Door Gasket Cleaning

The door gasket is an important part to maintain and seal the freezer to achieve a proper temperature. Over
time, the gasket can get deformed or damaged if not properly kept clean from ice. To clean off the ice and
frost accumulating on the gasket, use a dull plastic scrapper to wipe off ice and frost accumulation that sticks
to the ice surface. Wipe off the water from the gasket before closing the door. Door gasket should be cleaned
at least monthly. More frequent cleaning may be required if dirt or excessive frost build-up prevents the door
from closing properly.

4.6 Vacuum Relief Port Cleaning

Use a soft cloth; remove any frost build-up from the vacuum relief port, located at the back of the main door
(See Quick View). Cleaning of vacuum relief port should be performed regularly, depending on how often and
how long the door is opened.

4.7 Defrost and Cleaning

The amount of frost accumulation in the freezer depends on how often and how long the door is opened. As
the frost gets thicker, the efficiency of the unit is adversely effected. The frost acts as an insulator as it slows
down the system’s ability to remove the heat from the freezer; this causes the unit to use more energy.

To remove the frost, move all products to another freezer that operates at the same temperature as the Esco
unit temporarily.

Turn off the power on the Esco unit, open the outer and inner doors to let the unit warm up. Place some
towels or other absorbent material around the freezer to absorb any melted frost that might run out. Once
the freezer is thawed, wipe off the condensation with a towel. Use a mixture of warm water and light
detergent to clean the interior and exterior of the unit carefully; do not let water drip into the refrigeration
and electrical compartments. Once cleaned, dry and power up the unit (see section 2.3 First Run).

4.8 PF Battery Checking

Locate the battery (see section 1.3 Quick View) and check its voltage output using a digital volt-meter. If the
voltage goes below 12 volts, replace the battery.

4.9 Preparing the Unit for Storage

Defrost and clean the unit as described in section 4.6 Vacuum Relief Port Cleaning. Turn off the battery power
switch. Turn off the freezer power switch. Disconnect power to battery(s) and to the freezer. The unit is ready
for storage.

4.10 Maintenance/Service Log

It is good practice (and in some cases regulatory requirement) to maintain a log of all maintenance work
carried out on your freezer.

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Ultra-Low Temperature Freezer

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5.1 LCO2/LN2 Backup System

The backup 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 the freezer warms above the user-defined set point, the
Backup System injects a controlled amount of liquid CO2 or N2 into the chamber to keep the chamber
temperature within the specified temperature range.

The LCO2 or LN2 must be injected from the access port located at the top side (back right corner) of the freezer.
The backup system probe should be installed side by side with control probe inside the cabinet.

For more information on the LCO2/LN2 backup system, please refer to the User Manual attached to the
accessory.

(Important Note: When selecting a LCO2 or LN2 supply cylinder, it must be equipped with a siphon tube)

5.2 Chart Recorder

The chart recorder is used as an independent
temperature monitoring for the freezer.

To install the chart recorder into the Freezer:
Open the cover plate (1) on the right bottom door
and install 4 screws at the corners of chart
recorder (2) from the back of right bottom door
(3).

For more information on how to run and calibrate
the chart recorder, please refer to the chart
recorder User Manual attached to the accessory.

2 1 3

18

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Ultra-Low Temperature Freezer

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Under no circumstances should the unit be disassembled, repaired, or converted by unqualified people. Failure
to follow these instructions may cause personal injury and/or loss of property due to malfunctions, electric
shocks or fire.

Should the unit malfunction, stop the operation, and then pull out the power plug or turn off the power supply
at source. Continuing to operate the unit when it shows signs of malfunctioning may cause irreparable damage
to the freezer and/or its components.

The following troubleshooting guidelines address some of the basic problems that can be solved by the user or
operator. However if the problem persist, please contact your local distributor.

Problem

Possible Cause

The freezer does not work
(unit won’t cool down at all)
Ensure that the power cable firmly connects the unit to the main power supply

Ensure the fuse of the power cable is not blown

Ensure that the unit has been turned on

Ensure that the freezer’s main door is closed

The freezer shows poor performance
(unit won’t cool down fast enough)

Ensure the temperature is set correctly

Ensure the freezer is located correctly according to the location (section 2.1.1) and
environmental (section 2.1.2) requirement

Ensure that the products placed inside the freezer are pre-frozen. Products with
room temperature require the freezer to cool down and freeze the products first,
affecting the overall performance.

Ensure that the freezer is not overloaded

Ensure that the doors are not frequently open

The freezer generates unusual noise

Ensure the freezer is located correctly according to the location (section 2.1.1) and
environmental (section 2.1.2) requirement

20

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Ultra-Low Temperature Freezer

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7.1 Engineering Drawing

1. PEP Cover

2. Temperature Controller

3. Door Handle

4. Main Door (White)

5. Main Door (Blue)

6. Condenser Grille

7. Chart Recorder Box

8. Thermal Break

9. Gasket

10. Stainless Steel Door Frame

11. Inner Door hinge

12. PEP

13. Inner Door

14. Embedded Pull

15. Access Port

16. Omega Bracket

17. Caster Wheel

1

2 3 4 5 6

7

8 9 10

11

12

13

14

15

16

17

22

7.2 General Specifications

LEXICON™ ULTRA-LOW TEMPERATURE FREEZER

UUS-668A-1

Temperature Range

-50oC to -86oC

Ambient Temperature Range

15oC to 32oC (59oF to 89oF)

External Dimension (W x D x H)

1010 x 945 x 1980 mm (40.0” x 37.2” x 78.0”)

Internal Dimension (W x D X H)

750 x 685 x 1304 mm (30.0” x 27.0” x 51.0”)

Capacity

668.8 L (23.6 ft3)

Electrical Rating

230 V AC 50Hz 1Φ

Full Load Amps/Breaker

12A / 20A dedicated

Power Consumption

Approximately 14.2 KWh/day

Number of Outer/Inner Doors

1/5

Shelves
Material

Stainless Steel 304, adjustable, 4 Shelves

Size (W x D)

738x611 mm (28.9” x 25.1”)

Max Load

50 kg (110 lbs.)

Temperature Controller

Industrial digital controller

Access Port

Ø 25 mm (1”) - 1 port

Insulation Type

Polyurethane foam insulation

Refrigerant Type

Environmentally-friendly HFC refrigerants

Compressor

2 x hermetic 1.0 hp compressor

Condenser

Enhanced finned-tube, forced-air cooled condenser

Storage Box capacity
with Inventory Rack

2” Box

400

3” Box

300

Net Weight

326.5 kg (720 lbs.)

Shipping Weight

378 kg (833 lbs.)

Shipping Dimension

1152 x 1092 x 2160 mm (45.3” x 43.0” x 85.0”)

APPENDIX

Controller

Parameter

Description

Value



Set point – target value

. ... .



Hysteresis

0.2 … 99.9

.

Low set point limit

.

High set point limit



Controller type





Switch on delay after power on

.

Minimum ON time (minimum time the unit is activated)

.

Minimum OFF time (minimum time the unit is deactivated)

Timer

Parameter

Description

Value

.

Defrosting/heating duration

.

Defrosting repeat cycle (only for  controller)

.

Current remaining running time

.

Service interval

.

Service counter

.

Total operating hours



Temperature display during defrosting

.

Response after power-on



Enable start/stop key

.

Function of K-2 relay

0 – no function
1 – signal alarm active

Alarm

Parameter

Description

Value

.

Low alarm limit

-999 … +999

.

High alarm limit

-999 … +999

.

Alarm hysteresis

0.2 … 99.9

.

Alarm suppression time (delay)

.

Sensor over/under range response

Input

Parameter

Description

Value



Sensor

.

Start value for indication range with measurement input voltage or current

.

End value for indication range with measurement input voltage or current

.

Signal for measurement input current

.

Process value offset (for calibration)

-99.9 … 99.9

.

Lead compensation resistance



Unit



Filter time constant

Note: Only the highlighted parameters are used in this UUS product

Freezer

:

_______________________________________________________________

Serial Number

:

_______________________________________________________________

Person in Charge

:

_______________________________________________________________

1. This log record should be used by the operator to record any new agent that has been introduced to

the freezer during its operation, problems encountered, etc.

2. Please also record any major maintenance procedure performed by the service technician, for

example: parts replacement, recertification, etc.

Date

Event

User Signature

Supervisor Signature

In case of emergencies, please call:

Name

:

_______________________________________________________________

Cell Phone Number

:

_______________________________________________________________

E-mail

:

_______________________________________________________________