Lauda VF 20040 C User manual

Operating Instructions
Versafreeze Chest Freezers
VF 20040 C, VF 55040 C, VF 75040 C,
VF 20085 C, VF 55085 C, VF 75085 C

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LAUDA-GFL Versafreeze chest freezers for the long-term storage of organic substances, for example, operate silently and
with exceptional reliability. Insulation consisting of vacuum insulation panels and polyurethane foam is the key to their eco-
nomical energy consumption.
The refrigeration compartment is made entirely of stainless steel.
The refrigeration system incorporates fully hermetic, air-cooled high-performance compressors and is maintenance-free.
Chest freezer models VF 20040 C, VF 55040 C and VF 75040 C can be set to temperatures as low as -40 °C.
Chest freezer models VF 20085 C, VF 55085 C and VF 75085 C can be set to temperatures from -50 °C to -86 °C.
The devices are optimized for operation at the respective maximum target temperature.
Before installing the appliance, please check the content of the delivery for completeness and integrity.
If you discover damage or have any complaints, please get in touch with your supplier or contact us directly.
LAUDA DR. R. WOBSER GMBH & CO. KG
Schulze-Delitzsch-Str. 4+5
30938 Burgwedel - Deutschland
Telefon: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: https://www.lauda.de
Translation of the original operating instructions
Q4DT-E_13-015-EN-01, 14.11.2022
© 2022 LAUDA DR. R. WOBSER GMBH & CO. KG

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Table of contents
Operating Instructions ........................................................................................................................................1
1Using the chest freezers................................................................................................................................7
Intended use ........................................................................................................................................7
Improper use........................................................................................................................................7
2Warranty ....................................................................................................................................................7
3Before starting up ........................................................................................................................................8
4Location of the chest freezer .........................................................................................................................8
5Operating voltage and electrical connection....................................................................................................9
6Commissioning............................................................................................................................................9
Operating and display elements on the touch screen unit.........................................................................10
Switching the appliance on and off ........................................................................................................12
Selecting a user profile ........................................................................................................................12
Managing access rights for user profiles (login and user profile display) ......................................................12
6.4.1 Switching the appliance on and off .................................................................................................13
Language selection..............................................................................................................................14
Refrigeration compartment temperature set point ..................................................................................14
Changing the password........................................................................................................................15
7Function description ..................................................................................................................................16
Function of the data logger, history.......................................................................................................16
Data transfer via USB .........................................................................................................................17
Internet connection ............................................................................................................................17
7.3.1 Entering e-mail addresses for forwarding alarms ..............................................................................17
7.3.2 Email configuration ......................................................................................................................18
7.3.3 Alarm management .....................................................................................................................18
Water cooling equipment option...........................................................................................................19
7.4.1 Adjusting the cooling water flow regulator .......................................................................................20
8Alarm limit values ......................................................................................................................................21
Setting a limit value for the cover alarm delay .........................................................................................21
Overtemperature limit value ................................................................................................................21
Low temperature limit value .................................................................................................................21
USr User level....................................................................................................................................21
Alarm and potential-free contact..........................................................................................................22
Resetting an alarm ..............................................................................................................................22
Probe monitoring................................................................................................................................22
Overtemperature or low temperature alarm ...........................................................................................22
Mains power failure .............................................................................................................................22
Battery fault alarm (internal battery) .....................................................................................................22
9Care and maintenance................................................................................................................................23
Defrosting .........................................................................................................................................23
Technical support ...............................................................................................................................23
10 Disposing of old appliances..........................................................................................................................23
11 Technical data ...........................................................................................................................................24

12 Circuit diagram......................................................................................................................................... 26
13 Auxiliary equipment .................................................................................................................................. 36
Data logger for monitoring and recording refrigeration compartment temperature ..................................... 36
Storage system.................................................................................................................................. 36
13.2.1 Inserts ....................................................................................................................................... 36
13.2.2 Boxes ........................................................................................................................................ 37
13.2.3 Grids ......................................................................................................................................... 37
14 Notes ...................................................................................................................................................... 38
15 Ordering spare parts / LAUDA Service........................................................................................................ 39
16 Product Returns and Clearance Declaration................................................................................................. 40
17 EC Declaration of Conformity ................................................................................................................... 41

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1Using the chest freezers
Intended use
LAUDA Versafreeze chest freezers can be set to temperatures between 0°C and -86°C, depending on the version.
The chest freezers are intended for the long-term storage of organic substances, for example. The devices are optimized for
operation at the respective maximum target temperature, at which they also achieve their optimum temperature stability
(over time). The more the set target temperature deviates from the optimal operating temperature,
the greater the temperature stability.
It is essential to read the information in these operating instructions. This is the only way to ensure the
fault-free functioning of the chest freezer. Only persons familiar with these operating instructions are
permitted to install and operate the appliances.
Caution:
Due to the low temperatures in the refrigeration compartment, suitable protective gloves must always be
worn when storing and retrieving refrigerated goods. Arms must also be covered.
Improper use
LAUDA Versafreeze chest freezers are not suitable for the long-term storage of food and beverages, or similar products.
The storage of highly flammable and/or explosive substances is forbidden. The devices are optimized for operation at the
respective maximum target temperature, at which they also achieve their optimum temperature stability (over time).
The more the set target temperature deviates from the optimal operating temperature, the greater the temperature sta-
bility. As a result, the devices are only suitable for material testing purposes to a limited extent.
The chest freezer must not be installed or operated in laboratory areas with aggressive or corrosive ambient conditions.
Aggressive media such as hydrochloric acid may not be heated or evaporated in the immediate vicinity or inside the appli-
ance itself. The chest freezer must not be operated in hazardous areas.
LAUDA chest freezers used in laboratories are not classified as medical devices. They are not subject to national or inter-
national medical device law and must be used accordingly.
2Warranty
All laboratory equipment and accessories from LAUDA DR. R. WOBSER GMBH & CO. KG are subject to warranty
claims, including repairs, installation and spare parts. In order to identify faulty appliances, we need the type designation
and the serial number from the type plate located on the top left of the right side wall of the chest freezer and possibly a
copy of the invoice.

3Before starting up
The information in these operating instructions must be read and observed without fail. This is the only way to ensure the
fault-free functioning of the freezer appliance. Safety instructions are identified by the following warning symbols.
Read and observe the op-
erating instructions
Caution!
Flammable refrigerant
(hydrocarbons)
Warning indicating cold
surfaces
Warning of dangerous
electrical voltage
General safety warning
Warning indicating crush-
ing of hands
The appliance must be completely disconnected
(all poles) from the power supply before com-
mencing maintenance and repair work
(pull out the mains plug).
The warranty does not cover the free repair of malfunctions resulting from improper installation and handling.
Only trained and qualified personnel are permitted to perform service and repair work on refrigeration
equipment. In the event of repair work, the refrigerant quantity must not exceed the initial fill quantity.
See the type plate for quantity information and material specifications.
Before soldering work is carried out on the refrigeration system, the refrigerant must be drained com-
pletely and the system blown through with dry nitrogen. Only trained and qualified personnel are per-
mitted to dispose of refrigerant and removed components.
Caution: flammable refrigerant (hydrocarbons)
Due to the nature and quantity of the refrigerants used, naked flames are prohibited within a radius of
1 m of the appliance.
Removed components bearing this marking must be disposed of separately.
4Location of the chest freezer
Always install the appliance on a solid, flat, horizontal indoor surface. The installation room must be at least 24 m3in size.
Alternatively, the installation room must be ventilated. Freezer appliances must be positioned at a minimum of 150 mm
away from other appliances or walls so that the aspirated cooling air can circulate freely. The condenser at the back of the
appliance must not be obstructed or blocked.
The ambient temperature must not exceed +28 °C as this would reduce the cooling capacity of the appliance and increase
the temperature in the refrigeration compartment. Effective ventilation in the installation room is usually sufficient to
lower the temperature.
The appliance is not intended for use in areas with an explosion hazard, such as during anesthesia using flammable gases or
vapors. Please refer to the technical data for information on the appliance protection level.

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Before the appliance is moved to its place of installation, the electrical system (see point 5 of these instructions) and,
if necessary, the alarm system (see point 8.5) must be connected. Ensure that the connection cable is not damaged when
the freezer appliance is moved.
Caution! Due to the nature and quantity of the refrigerants used, naked flames are prohibited within a ra-
dius of 1 m of the appliance.
5Operating voltage and electrical connection
A marked equipotential bonding connection is located at the back of the chest freezer. Local regulations may stipulate the
need to connect the appliance to a grounding network for equipotential bonding. Please check before commissioning the
appliance.
The operating voltage and the mains frequency on the type plate (right side wall, top left) must
match the power supply specifications.
The main switch on the refrigeration system must switched off (position 0). Once these conditions
have been met, establish the electrical connection.
The refrigeration system may only be operated on a correctly installed power connection with a protective
earth conductor (PE) that complies with local regulations.
It must be possible to disconnect all poles of the power supply from the power network
(e.g. via an earthed socket or switch).
6Commissioning
Caution:
due to the low temperatures in the refrigeration compartment, suitable protective gloves must always be
worn when storing and retrieving refrigerated goods. Arms must also be covered.
Caution:
Do not leave the chest freezer keys near the appliance or within the reach of children.
Do not store acids or alkaline solutions that can erode the materials, hazardous substances that emit
harmful vapors, or highly flammable and/or explosive substances inside the appliance
(DGUV Information 213-850).
Read and observe the operating instructions.
Off
On

Operating and display elements on the touch screen unit
The three large colored symbols on the left of the display indicate the ACTUAL temperature at the most important points
on the appliance: the refrigeration compartment (blue field) and condenser (purple field), while the orange field shows the
voltage of the internal battery.
The bottom line on the display indicates whether the appliance is a single-stage or dual-stage device. Rotating symbols indi-
cate that the compressors or internal fan on the condenser are operating. The other symbols have the following meaning:
ON/OFF Alarm
Menu Cloud connection
Login and user profile display Back one level
Controller Data logger, history
Settings/Controller settings
LED status indicator
(see table below)

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Normal refrigeration LED 1 and auxiliary device LED 2
Status
No.
LED 1
i symbol
Description
1
green
Active and no fault during normal refrigeration.
2
red
All other cases, including:
Connection failure
Collective fault
Standby
Status
No.
LED 2
Snowflake symbol
Description
1
green
Active and no fault in the auxiliary device.
2
yellow
Refrigeration compartment temperature is too high. Safety cooling
(auxiliary device) is on standby.
Solenoid valve will be activated "soon” and no fault in the auxiliary device.
"Soon" means: Refrigeration compartment temperature is within the hysteresis
range around the resulting set point (between lower and upper switching point)
and solenoid valve is not active.
3
yellow, flashing
Solenoid valve active (coolant (CO2or LN2) is injected), no fault in the auxiliary
device. Coolant is only injected when the door is closed.
4
off
No auxiliary device connected.
5
red
All other cases, including:
Collective fault
Standby

Switching the appliance on and off
The appliance can only be switched on and off from the user profile "User" (see points 6.3 and 6.4 in the operating
instructions). Switch on the appliance by setting the main switch (see point 5 of the operating instructions) to position "I".
Approx. 5 seconds after the control element has booted up, the overtemperature Tmax 1 alarm appears on the display and
the alarm signal sounds. Acknowledge the alarm on the display.
Selecting a user profile
To select a user profile such as User (point 6.4 of the operating instructions), tap the "Login" symbol and user profile
display. Tap the desired user profile to select it, enter the relevant password for the selected profile
(point 6.4. of the operating instructions) and press save to exit the screen.
Managing access rights for user profiles (login and user profile display)
Admin 1
All settings required to integrate the freezer into the operator's IT landscape, for example, can be configured under the
user ID Admin1. The default password is "Admin 1".
Guest
The freezer appliance is started under the user ID "Guest". All relevant operational data can be accessed on this level.
It is not possible to switch the appliance on and off or modify settings on this level. The default password is "Guest".
User
Users logged in to the "User" profile can configure settings such as those for switching the appliance on and off as well as
the refrigeration compartment temperature set point and the alarm delay for the door. The default password is "User".
Service
Under the "Service" user ID, the operator/user can modify more advanced settings than those on the "User" level, including
changing parameters or set point temperature limits and transferring data via USB. The default password is "Service".

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ADMIN
All data and settings that were preset by the manufacturer of the freezer appliance, such as the permitted or possible set
point limits for the refrigeration compartment temperature, are stored under the "ADMIN" user profile.
The operator cannot modify the settings in this profile.
6.4.1 Switching the appliance on and off
Once the user profile has been changed, the display switches to the start screen. Touch VF XXXYY on the display to
switch to the controller view. Press the ON/OFF symbol on the touch screen unit. The temperature and "collective
alarm" appear on the display. Acknowledge the alarm.
To switch off the appliance, first press the ON/OFF symbol on the touch screen unit and then set the main switch to
position 0.
Caution:
To switch off the chest freezer for longer periods, press the ON/OFF symbol on the touch screen unit
until OFF appears on the display and then set the main switch to position 0.
If the alarm contact of the alarm system (see point 7 of the operating instructions) is connected to an in-
house fault monitoring system, an alarm is triggered when the cabinet is switched off.
Inform the office responsible for monitoring faults well in advance that you intend to switch off the chest
freezer.
Caution:
If the appliance is only switched off at the main switch, the "power failure" alarm triggers and the appliance
records the temperature inside the cabinet for approx. 35 hours, powered by the internal battery.

Language selection
The only languages currently available are German and English
Proceed as follows:
Menu
Settings
Language
After selecting the language, press the switch below
the additional LED display. Touch VF XXXYY on the display
to switch to the controller view.
Refrigeration compartment temperature set point
Once the refrigeration device has been switched on at the
main switch and at the touch screen unit (see above), the
display shows the current temperature in the refrigeration
compartment. The temperature controller switches on the
compressors to start the cooling process so that the refriger-
ation compartment reaches the set point temperature. The
refrigeration compartment temperature display remains red
until the set point temperature is reached. When the set
point is reached, the display color changes to white. If a fault
occurs on the appliance, the display changes back to red.
The refrigeration compartment temperature set point can be
modified by tapping the symbol for the refrigeration com-
partment temperature set point. Select the required tem-
perature in the refrigeration compartment by sliding the cur-
sor or pressing the "-" or "+" symbol, and then press the save
button to store the refrigeration compartment temperature
set point.

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Changing the password
Only the passwords for a specific user profile and all subordinate levels can be changed from the relevant user profile.
An Admin1 can change all passwords, a User can only change the passwords for a subordinate Guest.
The number of stars in the yellow padlock at the top of the screen indicates which user profile is currently active.
The Admin1 padlock contains three stars, Service two stars, User one star, and Guest no stars.
Tap the menu symbol to change the password for a user profile.
Menu
User management
User
Then tap user management and select the relevant user. Tap the input symbol , enter the "old password" and save.
The display changes to "Password". Enter and save the new password, then touch the symbol for one level back twice to
display the controller view.

7Function description
LAUDA Versafreeze chest freezer models VF 20040 C, VF 55040 C and VF 75040 C are equipped with a high-perfor-
mance compressor and operate within a variable temperature range of -0 °C to -40°C. Models VF 20085 C, VF 55085 C
and VF 75085 C are equipped with two high-performance compressors and operate at a temperature range between -
50 °C and -86°C. The air-cooled condenser at the back of the appliance releases heat extracted from the refrigeration
compartment into the room. The temperature controller maintains a constant temperature in line with the preset value.
The current temperature in the refrigeration compartment is shown on the controller display.
The devices are optimized for operation at the respective maximum target temperature, at which they also achieve their
optimum temperature stability (over time). The more the set target temperature deviates from the optimal operating tem-
perature, the greater the temperature stability.
Function of the data logger, history
The data logger starts automatically and records the temperature in the refrigeration compartment, the condenser tem-
perature, and the internal battery voltage every 120 seconds. Different views, e.g. days or hours, can be selected by tap-
ping the "Data logger, history" symbol.
To view past events, tap the symbol to open a window for setting the start and end dates. Now choose the desired start
and end dates, tap to select, then press OK to confirm. Tap an hour or day to return to the current display.
The data logger is equipped with a 1 GB industrial SD card and can therefore record data for 2 years before the memory is
full. When the memory is full, the oldest data is overwritten first so that only the most recent data is retained.
We recommend exporting the data, e.g. every six months, depending on its importance, or performing more regular back-
ups (see Data transfer via USB).
Selection of displayed control curves:
Briefly tapping the symbols An1, A2F, or ba1 shows the designation of the symbols on the left of the display.
All three control curves are selected by default. In order to display only one control curve, the other control curves must
be deactivated. To deactivate a control curve, press the corresponding symbol and hold for approx. 3 seconds.
The symbol turns white and the control curve disappears. To activate the control curve, press the deactivated white symbol
and hold for approx. 3 seconds until it reverts back to its original color.
Blue (An1) = Refrigeration compartment (compartment temperature)
Purple (A2F) = Condenser (condenser temperature)
Orange (ba1) = Battery (internal battery voltage)

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Data transfer via USB
In order to carry out a data transfer, the Service or Admin1 user profile must be selected.
Proceed as follows:
Select Menu
Select USB
Select Export history
Insert USB stick. Once the USB stick has been recognized, tap the save symbol.
After transferring the data, save and remove the USB stick
Internet connection
The touch control unit can also send alarms by e-mail. Different e-mail addresses and an e-mail server can be configured
for this purpose.
7.3.1 Entering e-mail addresses for forwarding alarms
In order to configure e-mail addresses, the Admin 1 user profile must be selected. E-mail configuration is used to forward
alarms via e-mail.
Pressing the
Menu
Email configuration
Address book
buttons opens the address book Clicking the "Add" symbol opens the recipient window, where you can enter the name and
e-mail address of the individuals who should receive e-mail notification of an alarm. Click Save to add the recipient.

7.3.2 Email configuration
Pressing the
Menu
Email configuration
Email server
buttons opens a window for configuring your email server settings. Save your entries before exiting.
7.3.3 Alarm management
Since all alarms indicating a possible fault may impact the proper operation of the appliance, we always recommend select-
ing Alarm 1 or Alarm 2 rather than the Warning setting.
Pressing the
Menu
Alarm management
Alarm 1
buttons opens the alarm management settings. Tapping the "Add" button opens the Controller window.
Select the checkbox next to VFXXXYY in this window and then save. The New configuration window then opens,
where you can select different alarms or tap the symbol to select all alarms. To give the configuration a name,
tap the symbol, enter the name, and save. A window with the name you assigned then opens.
Tapping the "E-mail" button opens the Recipient window. Tap the white button next to the name in this window.
A selection window containing the previously entered e-mail addresses opens. Select the required e-mail address and save.
Press the symbol to return to the screen view.

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Water cooling equipment option
Installation of a heat exchanger (water refrigerant) instead of a condenser. The heat exchanger significantly reduces the
heat emitted by the device into the surrounding air, while expanding the permissible working temperature range.
The temperature is pressure-controlled by the freezer appliance. Suitable for connection to a recooling system or water
supply (external thread connection for pressure hose ½ ″with union nut). Other connection types on request.
Not suitable for the models VF 200xx C.
Inlet water pressure min. 0.2 bar, max. 10 bar.
Inlet water temperature min. 4 °C, max. approx. 25 °C.
1
2
3
4
5
6

7.4.1 Adjusting the cooling water flow regulator
The cooling water flow regulator only needs to be adjusted if the on-site cooling water is significantly warmer or colder
than the set value used during the test run. This set value can be found on the label on the cover of the cooling water flow
regulator. If the temperature deviates by 10 °C or more, we recommend adjusting the cooling water flow in small incre-
ments (approx. 0.1 on the scale). The temperature difference between the cooling water inlet and outlet temperature
should be 15 –20 K. To adjust the cooling water flow regulator, open the cover of the cooling water flow regulator at the
back of the appliance.
Figure 1 Figure 2
Unscrew the knurled screw Open the cover of the cooling water flow regulator
Figure 3
Turn the adjustment wheel towards the 1 on the scale to increase the cooling water flow;
turn it towards the 5 on the scale to reduce the quantity of cooling water.