Global Cooling ULT25 User manual

Global Cooling
ULT25 -80º C Portable Freezer
User Manual
Free Piston Stirling Cooler
F
F P S C

© Global Cooling, 2009 10/29/2009
Version 1.2u
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INTRODUCTION
The ULT25 (Ultra Low Temperature, 25 liter volume) incorporates next generation Free-Piston
Stirling Cooler (FPSC) technology.
FPSCs differ from conventional compressor based refrigeration in that they provide high
efficiency, deep-temperature cooling in a lightweight package allowing true portable operation.
TABLE OF CONTENTS
INTRODUCTION..................................................................................................................... 2
TABLE OF CONTENTS.......................................................................................................... 2
SAFETY PRECAUTIONS ....................................................................................................... 3
UNPACKING AND SET-UP ................................................................................................... 4
FEATURES................................................................................................................................ 5
Freezer..................................................................................................................................... 5
Control panel ........................................................................................................................... 6
OPERATION QUICK GUIDE ................................................................................................ 7
OPERATION............................................................................................................................. 8
General Operating Principles .................................................................................................. 8
How to Turn the Freezer On/Off............................................................................................. 8
Changing the set temperature.................................................................................................. 8
To see the current set temperature................................................................................................... 8
Change the Set Point to a new value ............................................................................................... 8
Using Preset Temperatures.............................................................................................................. 9
Changing the preset values.................................................................................................... 10
Min and Max Temperature.................................................................................................... 10
Over Temperature Alarm ...................................................................................................... 10
How to silence the audible Temperature Alarm ............................................................................ 10
To postpone an Alarm.................................................................................................................... 11
How to change the Over (Under) Temperature Allowance ........................................................... 11
To Silence the Temperature Alarm ................................................................................................ 11
Error conditions..................................................................................................................... 12
Locking the Panel.................................................................................................................. 12
To Lock the freezer panel............................................................................................................... 12
To Unlock the freezer panel........................................................................................................... 12
How to switch between power supplies ................................................................................ 12
Error Codes ........................................................................................................................... 13
MAINTENANCE .................................................................................................................... 14
Air Intake Filter..................................................................................................................... 14
Storage................................................................................................................................... 14
Cleaning ................................................................................................................................ 14
TROUBLESHOOTING.......................................................................................................... 15
SPECIFICATIONS................................................................................................................. 16
WARRANTY........................................................................................................................... 17

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SAFETY PRECAUTIONS
To prevent personal injury, injury to others, or damage to property, read these safety
precautions carefully before use.
•Do not disassemble, modify or repair. There are no user serviceable parts inside the
covers.
•Do not immerse in water or pour water on the unit.
•Do not put ice or liquid water directly in the freezer box, always use suitable containers.
•Do not use glass containers when the contents might freeze and break.
•Do not store flammable items such as gasoline, thinner, or solvents in the freezer. The
freezer is NOT rated as an explosion proof freezer.
•Do not remove any frost or ice which has accumulated on the inside of the freezer using
hard and/or sharp objects, such as knives, screwdrivers, etc. The inside panels are heat
exchangers and can be damaged.
•Do not cut, change or modify the power cable.
•When removing the plug, hold onto the plug and not the cord.
•Do not block the air intake or air discharge vents.
•Do not drop, throw, or abuse the freezer.
•Do not operate under extreme environmental conditions, such as in a car trunk, in very
high humidity environments, in rain or other severe weather.
•Do not use solvents to clean the panel or the outside or inside of the freezer.
•An Ultra Low Temperature Freezer is qualitatively different than a home freezer. At -80º
C frostbite can occur in seconds
•. You should establish and follow a protocol for safe ULT operating procedures. This
should include (but not limited to):
Never handle samples or freezer accessories with bare hands.
Do not use gloves which become brittle at ultra low temperatures
Nitrile and latex gloves are inadequate
Liquid permeable gloves are dangerous because ULT liquids can be held against the skin
and increase the amount of damage.
Be especially careful that liquids at ULT are not spilled onto skin or clothing.
Use only sample containers that have been approved or tested for ULT use.
Some plastics shatter at Ultra Low Temperatures. Avoid splinter hazards.
Biological and Chemical Hazards are still hazardous at ULT. Always wear
proper protective equipment and follow appropriate isolation protocols.
Many types of labels will fall off and/or break at ULT. Some types of ink which
stick to glass and/or plastic at room temperature lose adhesion at ULT.
•In addition to the ULT hazards above, there are also physical hazards to consider:
Be cautious when closing the lid to avoid a pinching hazard.
Be careful when loading the box with heavy items.
Always use the handles to carry the freezer.

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UNPACKING AND SET-UP
1. Remove the freezer and all accessories from the box. Carefully inspect the freezer and
all accessories for any shipping damage.
2. The following items are included;
¤ ULT25 Freezer with inner foam lid ¤ User Manual on CD
¤ SS-18 AC Power Supply with cord ¤ Warranty Registration
¤ 12V DC Power Cord (for auto accessory plug) ¤ Bag with stoppers for access port
¤ Key for lock ¤ Bag with sealing material for access port
3. Place the freezer on a level surface.
4. Make sure that the air inlets and outlets are not blocked
5. Connect to a power source. The freezer can be used with either the AC Power Supply
for lab, home or office use, or the DC Power Cord for automotive use.
a. To use the AC Power Supply:
i. Connect the square plugs on the end of the cord to the power supply as shown.
Securely tighten the terminal screw against the
pin using a flat screwdriver.
ii. Be certain to observe the correct polarity.
Failure to do so may harm the freezer.
iii. Plug the black and red connectors into the
ULT25.
iv. Plug the AC Power Supply cord into a 115 volt
AC source. To use with a 220-240 V supply,
the red switch on the AC Power Supply must be
moved to the 230 V position.
v. Turn on the power supply
b. To use the DC Power Cord in a motor vehicle:
i. Make sure the freezer remains level. Exceeding
an angle of 12 degrees may cause loss of
cooling.
ii. Plug the DC Power Cord into a 12V outlet that is rated at 18 amps or greater.
Consult your automotive specialist if your vehicle lacks 18+ A rated 12V outlets.
iii. Plug the black and red connectors into the ULT25.
6. NOTES ON OPERATION IN A VEHICLE
a. The ULT25 will operate on battery power for a limited time before the battery is
drained and the car cannot be started. This time will vary from vehicle to vehicle but
is generally only a few hours.
b. The engine should be running to prevent accidental total discharge of the battery.
c. The power to 12V outlets in some vehicles may be interrupted during engine
starting. This will cause a sudden stop of the cooling unit which may produce a
sound that is different than when the turning off the ULT25 by using the OFF
button. This is normal and will not damage the cooling unit. The cooling unit will
restart automatically once power resumes.
d. Do not operate the ULT25 an unattended in a vehicle. This may lead to overheating
if left in the sun and subsequent damage to stored contents

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7. Disconnecting from power
a. Turn off the freezer (see OPERATION section below)
i. The 7-segment display will show the word “OFF” while the FPSC turns off.
ii. Unplug the freezer after the word “OFF” disappears and the display goes dark.
iii. If you unplug the freezer while it is ON, you will hear a sudden noise when the
FPSC shuts OFF. Power outages will also cause the same noise.
FEATURES
Freezer
The Global Cooling ULT25 FPSC freezer has the
following features:
•A freezer chamber which is protected by
two lids
oInner lid – a tight fitting foam lid
oOuter lid – a latching lid with a lock
•Control Panel
oDescribed in more detail in the next
section
•Locking latch
oCan be locked to provide sample
security
•Access port
oFor thermocouple wires, purge gas, etc
•Cleanable filter
oHelps protect the heat rejection fins
from dust
•Power Connector
oColor coded for positive/negative,
can only mate with cords one way
Outer
Lid
Inner
Lid
Freezer Chamber
1/4”
Access
Port
Double
Gasket
Moisture
Seal
Lid
Latch
Key
Lock
Cleanable
Filter
Vent
Control
Panel

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Control panel
Temperature Presets
I/O
- 80ºC
LAB
FREEZER
Ultra Low Temperature
Set T
ErrorLocked Over T
1 2 3
Global
Cooling
ULT-25
ON/OFF
button
DOWN/UP
buttons
7-segment
display
ON/OFF
LED
Set T
Temperature
button
Buttons 1, 2and 3
Multifunctional, see
OPERATION section
Set T
LED
Indicator
LEDs
7-Segment display
oShows all numerical displays – default display is chamber temperature
ON/OFF button and LED
oTurns freezer on and off and shows state
Set T button and Set T LED
oThis must be pressed to adjust the Set Temperature
Temperature Presets 1, 2and 3
oThese control the temperature Presets
When the Set T LED is not glowing, pressing the button shows the
value
When the Set T LED is glowing, pressing this button changes the set
point to the preset value
Pressing and holding one of these buttons and / changes the value
oWhen the Error / Over T LEDs are lit then
2– shows and controls errors
3– controls the audible over/under temperature alarm
oPressing all three buttons simultaneously controls the panel LOCK function
/ buttons
oUsed to adjust Set Point Temperature (when the display shows S ##)
oUsed to adjust Preset Temperatures (when the display shows P ##)
oUsed to adjust Over/Under Temperature alarm settings (display shows ## h)
oUsed to show MIN / MAX temperatures since last reset (H### or L###)
Error LED
oIndicates when there is an electrical, mechanical or similar error condition.
Over T LED
oIndicates when the chamber is over / under the set point.
The audible beeper can be set to delay warning.
Locked LED
Indicates when the panel is locked.
In this User Guide indicator LEDs are italicized, control buttons and 7-segment display
values are BOLD. Colored bullets and text are used to group similar features and are the
same color through the text and in the Quick Guide at the end of the manual.

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QUICK GUIDE
- - - - - - - - - - - - - clip, laminate, keep with freezer - - - - - - - - - - - - - - - - -
Global Cooling ULT-25 Freezer
BASIC FUNCTIONS
ON Press & hold I/O for two beeps
OFF Press & hold I/O for three beeps
Change Set Point Press & hold Set T until Set T LED glows, S ## displayed, then 

or 


See Set Point Press Set T briefly. S ## displayed
Return to Temp Display Press Set T briefly, or wait 8 seconds.
7-segment display number only – chamber temperature; S ## – set point;
ADVANCED FUNCTIONS
Change to Preset Press & hold Set until Set T LED glows, S ## displayed, then Preset 1 2 or 3
Change Preset Temp Press & hold Preset 1 2 or 3, P ## is displayed, and then 

or 


Max Temp Set T LED must be off. Push 

briefly. H### displays the Max temperature.
Min Temp Set T LED must be off Push 

briefly. L### displays the Min temperature.
Clear Temp Min/Max Set T LED must be off Push both 

and 

simultaneously.
Postpone Over T Alarm When Over T light glows, press Preset 3 until time shows (1.0h default)
(If Over T LED is not glowing, then Preset 3 acts as a Temp Preset)
Change Silence Time When Over T light glows, press Preset 3 until time shows (1.0h default)
then use 

or 

while continuing to press Preset 3
Perm. Silence Alarm Change silence time to negative number. LED will function, but not Audible
Change Temp Allowance When Over T light glows, press Preset 2 and 3until A## shows, then 

or 


Return to Temp Display Wait 8 seconds
See Error Code Again If Error LED is on then Press Preset 2briefly
(If Error LED is not glowing, then Preset 2 acts as a Temp Preset)
Turn off Error LED Press & hold Preset 2for 5 seconds when Error LED is on (will turn on again
if error condition persists)
Lock Panel Press & hold Preset 1 AND 2 AND 3 until Locked LED turns on (5 seconds)
Unlock Panel Press & hold Preset 1 AND 2 AND 3 until Locked LED turns off (5 seconds)
7-segment display H### – Max temp; L### – Min temp; P ## – Preset temp; ## h – alarm silence;
A ## – Temp Allowance; E ## – Error code
© Global Cooling Inc, 2009
- - - - - - - - - - - - - clip, laminate, keep with freezer - - - - - - - - - - - - - - - - -

© Global Cooling, 2009 10/29/2009
Version 1.2u
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OPERATION
General Operating Principles
Important changes to the freezer settings require sustained button pushes. This helps
prevent accidental changes to the settings during transportation. Some sequences require a 3
second button press and hold while other sequences require a 5 second button press and hold.
For example,
Turning the freezer ON requires a 3 second press and hold (two beeps)
Turning the freezer OFF requires a 5 second press and hold (three beeps)
The default display is the chamber temperature. Other displays such as Set Point,
Alarm Postpone, etc., are marked with a letter such as S (set point), h (alarm postpone), etc.
These secondary displays revert to the default display after approximately 8 seconds of button
inactivity.
How to Turn the Freezer On/Off
To turn the freezer on
oPress and hold the I/O button for two beeps (~3 seconds)
oThe freezer will display a greeting message, and then the chamber temperature
To turn the freezer off
oPress and hold the I/O button for three beeps (~5 seconds)
oThe freezer will display “OFF” for 10 seconds, and then go dark.
Changing the set temperature
To see the current set temperature
Press the Set T button briefly
The current set temperature will be displayed with the letter S ##
oAfter 8 seconds of inactivity the display will revert to the current temp
Change the Set Point to a new value
There two ways to change the Set Point
oManually adjusting the temperature using / 
oUsing one of three adjustable Preset Buttons
Adjusting the Set Point manually
oBecause of the importance of the Set Point Temperature, changing the Set Point
requires a “two button procedure”. This means:
Method A - either holding the Set T button while simultaneously
pressing / -- OR
Method B - holding down Set T until the Set T LED glows and then
pressing / .
Methods A and B achieve the same effect. The user can use whichever
method they prefer.

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To change the set Set Point by method A
oPress and hold the Set T button and then push the / buttons (do not
release the Set T button).
The Set Point temperature will appear with the prefix Sin the 7-segment
display.
When the / buttons are pushed the Set Point will change by 1º C.
at first
If the / buttons are held for 5 seconds the step size will increase to
5º C.
If the / buttons are briefly released (less than ½ second) while
continuing to hold down the Set T button the increment/decrement size
will return to 1º C.
Release all buttons once the desired Set Point is achieved. The display
will return to chamber temperature after about 8 seconds.
To change the Set Point by method B
oPress and hold the Set T button until the Set T LED is lit.
The Set Point temperature will appear with the letter S in the first 7-
segment display.
oThe / buttons can be used to change the Set Point.
When the / buttons are pushed the Set Point will change by 1º C.
at first
If the / buttons are held for 5 seconds the step size will increase to
5º C.
If you briefly release (a half second) the / buttons while
continuing to hold down the SET button the increment/decrement size
will return to 1º C.
Release the/ buttons once the desired Set Point is achieved.
oPress the Set T button briefly (less than 1 second) to turn off the Set T LED.
The display will return to chamber temperature.
Using Preset Temperatures
The three buttons labeled 1, 2and 3can be used to quickly change the Set Point to
frequently used values. When shipped the Presets are set to -80º C, -40º C, and -20º C.
They can be set to any preferred values (see next section).
To choose one of the preset temperatures:
oPress and hold the Set T button until the Set T LED glows
oPush one of the Preset Temperature buttons briefly
oThe new set temperature will be shown in the 7-segment display
oIf this is the desired Set Temperature the user can either:
Briefly press the Set T button to turn off the Set T LED OR
Wait for approximately 8 seconds when the freezer panel will return to
normal operation

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Changing the preset values
Many users will have protocols that specify temperatures such as -75º C, etc. The
Preset buttons allow users to quickly change the Set Point to those temperatures.
Changing the preset value does not change the Set Point itself. Only the value of the
preset is being changed. This means the Set T button is NOT pressed for this
procedure.
Press and hold one of the PRESET TEMPERATURE buttons
oUse the / buttons to change the value of the preset button.
This value will be saved even if the freezer is turned off or powered off.
To change the Set Point to this new Preset value follow the instructions in the previous
section.
Min and Max Temperature
The freezer remembers the highest and lowest temperatures since being turned on or
since the min/max was last reset (min initially reads 0 until chamber T falls below 0).
oDo not use Set Temperature mode (The Set T LED should be off)
oPress () briefly to see the Min (Max) temperature
oTo reset the Min/Max memory, simultaneously press both and 
Over Temperature Alarm
The freezer has an adjustable over and under Temperature Alarm mode. This alarm
can be activated whenever the freezer is on, even when the panel is locked.
oIf T chamber ≥15º C when the freezer is turned on, the Temperature Alarm is
automatically postponed for 3.0 hours to allow initial cooldown.
If the freezer compartment temperature is 10º warmer or colder (adjustable, see below)
than the set point for 5 seconds then it will go into Temperature Alarm mode.
oThe Over T light will go on (this is used for under temperature alarms as
well).
oThe freezer will make a double beep every 10 seconds.
oSituations which can affect the freezer’s ability to maintain a steady state or
cooling rate include:
The lid is ajar
The air vents are blocked
Addition of a large relatively warm mass
Power supply problems
Mechanical and/or electrical problems.
How to silence the audible Temperature Alarm
The Over T light will always be on when the cooler temp is over or under the set temp
by more than 10º C (adjustable, see below) .
The audible alarm can be silenced in two different ways
oPostponed - The audible alarm will be silenced for an adjustable time period.
oSilenced – it will be off until it is manually reset or the freezer is turned
OFF/ON