Lauda UWT Series User manual

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YAWE0029
English
Translation of the original operating instructions
Read the instructions prior to performing any task!
LAUDA DR. R. WOBSER GMBH & CO. KG
Pfarrstraße 41/43
97922 Lauda-Königshofen
Germany
release 06/2018 i
replaces release 08/2016 h, 03/2010, 01/2009,
03/2006
Telephone: [phone]
Fax: [phone]
E-mail [e-mail]
Internet http://www.lauda.de
Operating instructions
UWT circulation heat exchangers
UWT 3000, UWT 6000, UWT 10000

UWT circulation heat exchangers
YAWE0029 / 29 June 2018 Prefixed safety information 3
Prefixed safety information
Before operating the equipment please read carefully all the instructions and safety
notes. If you have any questions please phone us!
Follow the instructions on setting up, operation etc. This is the only way to avoid incor-
rect operation of the equipment and to ensure full warranty protection.
Transport the equipment with care!
Equipment and its internal parts can be damaged:
by dropping
by shock.
Equipment must only be operated by technically qualified personnel!
Never operate the equipment without the heat transfer liquid!
Do not start up the equipment, if
it is damaged or leaking,
the supply cable is damaged.
Switch off the equipment and pull out the mains plug:
for servicing or repair
before moving the equipment!
Do not carry out any technical changes on the device!
Have the equipment serviced or repaired by properly qualified personnel only!
The Operating Instructions include additional safety notes which are identified by a triangle with an
exclamation mark. Carefully read the instructions and follow them accurately! Disregarding the in-
structions may have serious consequences, such as damage to the equipment, damage to property
or injury to personnel!

UWT circulation heat exchangers
4Contents YAWE0029 / 29 June 2018
Contents
Prefixed safety information ...........................................................................................................................3
Contents........................................................................................................................................................4
1Safety notes......................................................................................................................................................5
1.1 General safety notes.................................................................................................................................5
1.2 Other safety notes.....................................................................................................................................6
2Operating and functional controls.....................................................................................................................7
3Unit description.................................................................................................................................................9
3.1 Environmental conditions..........................................................................................................................9
3.2 Unit types ..................................................................................................................................................9
3.3 Principle of operation ................................................................................................................................9
3.4 Pump.........................................................................................................................................................9
3.5 Temperature display, controller and safety devices................................................................................10
3.6 Interfaces (remote socket 15N)...............................................................................................................10
3.7 Substances / materials in the liquid circuits ............................................................................................10
4Unpacking.......................................................................................................................................................11
5Preparations...................................................................................................................................................12
5.1 Siting and connection..............................................................................................................................12
5.2 Filling.......................................................................................................................................................13
5.3 Draining / frost protection........................................................................................................................14
6Starting up......................................................................................................................................................15
6.1 Mains connection ....................................................................................................................................15
6.2 Switching on............................................................................................................................................15
6.3 Adjusting the outflow pressure with the bypass valve.............................................................................16
7Maintenance...................................................................................................................................................17
7.1 Cleaning..................................................................................................................................................17
7.2 Servicing and repair ................................................................................................................................17
7.3 Spare parts ordering and rating label......................................................................................................18
8Technical data and circuit diagram.................................................................................................................19
8.1 Technical data.........................................................................................................................................19
8.2 EU conformity..........................................................................................................................................20
8.3 List of components with circuit diagram..................................................................................................21
Confirmation
Explanation of signs:
Caution:
This sign is used where there may be injury to person-
nel if a recommendation is not followed accurately or is
disregarded.

Note:
Here special attention is drawn to some aspect. May
include reference to danger.

Reference:
Refers to other information in different sections.

UWT circulation heat exchangers
YAWE0029 / 29 June 2018 Safety notes 5
1 Safety notes
1.1 General safety notes
A circulation heat exchanger is used to cool and circulate heat transfer liquids as specified. This leads to
hazards due to the emission of heat transfer liquid and / or of cooling liquid and to general hazards due
to the use of electrical energy.
The user is largely protected through the application of the appropriate standard specifications.
It is not possible to cover all possibilities; they remain largely within the responsibility and the judgement
of the user.
The unit must only be used as intended and as described in these operating instructions. This includes
operation by suitably instructed qualified personnel.
The units are not designed for use under medical conditions according to DIN EN 60601-1 or
IEC 601-1!
Classification in accordance with EMC requirements
Device
Immunity
Emissions class
Customer power
supply
Circulation heat
exchangers
UWT 3000, UWT 6000,
UWT 10000
Type 2 in accordance
with
DIN EN 61326-1
Emissions Class B
in accordance with
CISPR 11
Worldwide
No limitation
For the USA only:
Instructions for Class A digital devices
“This equipment has been tested and found to comply with the limits for Class A digital device, pursuant
to Part 15 of the FCC (Federal Communication Commission) Rules. These limits are designed to pro-
vide reasonable protection against harmful interference when the equipment is operated in a commer-
cial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference at his own expense.”
“This device complies with Part 15 of the FCC (Federal Communication Commission) Rules. Operation
is subject to the following two conditions: (1) This device may not cause harmful interference, and (2)
this device must accept any interference received, including interference that may cause undesired
operation.”
For Canada only:
“This Class A digital apparatus complies with Canadian ICES-003” (ICES = Interference Causing
Equipment Standards).
« Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada ».

UWT circulation heat exchangers
6Safety notes YAWE0029 / 29 June 2018
1.2 Other safety notes
Connect the unit only to grounded mains power (PE).
Use suitable hoses.
Protect tubing with hose clips against slipping off. Prevent kinking of tubing!
Check tubing from time to time for possible material defects!
Allow for expansion of the heat transfer liquid at elevated temperatures!
Always pull out the mains plug before cleaning, maintenance or moving the device!
Repairs must be carried out by properly qualified personnel only.
Values for temperature control and indicating accuracy apply under normal conditions according to
DIN 12876. High-frequency electromagnetic fields may under special conditions lead to unfavoura-
ble values. This does not affect the safety!

UWT circulation heat exchangers
YAWE0029 / 29 June 2018 Operating and functional controls 7
2 Operating and functional controls
Front of UWT 3000
Front of UWT 6000 and UWT 10000
Filling nozzle for heat transfer liquid
Controller with temperature display and
operating keys
Mains switch with indicating lamp
Red warning lamp for overtemperature
Yellow warning lamp for low level
Pressure indication
(only at UWT 6000 and UWT 10000)
Light-emitting diodes:
K 1: Lights when cooling water valve "open"
K 2: Lights for overtemperature
Level indication

UWT circulation heat exchangers
8Operating and functional controls YAWE0029 / 29 June 2018
Back of UWT 3000
Back of UWT 6000 and UWT 10000
Laboratory circuit
- return pipe for load
Laboratory circuit
- return pipe for load
Primary circuit (external)
- inlet of coolant
Primary circuit (external)
- return flow of coolant
Remote socket 15N with alarm outputs
and remote switch-on
Mains cable
Drain tap
Rating label
Laboratory circuit
- return pipe for load
Laboratory circuit
- flow pipe for load
Primary circuit (external)
- inlet of coolant
Primary circuit (external)
- return flow of coolant
Remote socket 15N with alarm outputs
and remote switch-on
Mains cable
Drain tap
Rating label

UWT circulation heat exchangers
YAWE0029 / 29 June 2018 Unit description 9
3 Unit description
3.1 Environmental conditions
The operation of the thermostats is only allowed under the following conditions as specified in
EN 61010-2-010:2003 and EN 61010-1:2001:
Indoor use.
Altitude up to 2000 m above sea level.
Foundation must be dense, even, non-slippery and non-flammable.
Ambient temperature range (8.1).
Use only within this range for an undisturbed operation.
Mains supply voltage fluctuations (8.1).
Maximum relative humidity 80 % for temperatures up to 31 °C, decreasing linearly to 50 % relative
humidity at 40 °C.
Transient over voltage according to Installation Categories (Over voltage Categories) II.
Pollution degree: 2.
3.2 Unit types
The type designation of the circulation heat exchangers in the Series UWT is composed of the prefix
designation UWT and the nominal transfer power of the heat exchanger.
Example: The UWT 6000 has a nominal transfer power of 6000 watts.
3.3 Principle of operation
The circulation heat exchanger dissipates heat from a laboratory circuit (secondary circuit) into an ex-
ternal cooling circuit (primary circuit).
To achieve this, the circulation heat exchanger is connected to a supply of cooling liquid available at the
customer's premises (maximum pressure 8.1). In the circulation heat exchanger the cooling liquid is
passed through the primary side of a plate-heat exchanger. Its secondary side is connected to the cir-
cuit of the circulation heat exchanger. It consists of an open bath vessel and a pressure pump. When
required, a temperature controller opens a solenoid shut-off valve in the primary circuit and dissipates
heat through the heat exchanger until the selected set-point temperature is reached.
3.4 Pump
The circulation heat exchanger has an integral pressure pump which provides the transport of the heat
transfer liquid in the secondary circuit.

UWT circulation heat exchangers
10 Unit description YAWE0029 / 29 June 2018
3.5 Temperature display, controller and safety devices
The circulation heat exchanger can be switched on and off externally via contacts on the signal connect-
or 15N.
The units are equipped with a two-state controller on which the set-point temperature of the bath circuit
can be set. The momentary actual temperature can be read off the green, three-figure digital display.
At the configuration level an overtemperature alarm threshold can be set (6.2).
When this value is exceeded, the light-emitting diode K 2 (next to the temperature display) and the red
overtemperature warning lamp illuminate. This signal is also output on a contact on the remote socket
15N.
The bath level is monitored by a float switch. A yellow warning lamp is switched on if the level is too low.
With a low level or overtemperature in the bath the pump is not switched off!
The mains feed cable is protected inside the unit by one or more safety fuses.
The pump is switched of by a winding temperature detector or overcurrent circuit breaker.
3.6 Interfaces (remote socket 15N)
The following signals (at mains voltage level) are provided on the remote socket 15N: (Pin 4) Unit On,
(6) Temperature too high and (5) Low water level. The unit can be switched off via the Pins 1 and 3.
3.7 Substances / materials in the liquid circuits
All of the parts which come into contact with the heat transfer liquid or the coolant are made of: stainless
steel, brass, copper, buna EPDM, PVC, polyamide, silver solder.
Suitable heat transfer liquids or coolant are water and glycol/water mixture.

UWT circulation heat exchangers
YAWE0029 / 29/06/2018 Unpacking 11
4 Unpacking
After unpacking, first check the unit and accessories for any transport damage. If contrary to
expectations the unit is found to be damaged, the shipping company must be immediately in-
formed so that verification can take place. Please also inform the LAUDA Service Constant
Temperature Equipment (Contact 7.3).
Standard accessories:
Number
Description
For units
LAUDA Cat. No
1
Operating instructions (this document)
All UWT's
YAWE0029
1
Plug for filling opening
All UWT's
EZV 086
1
Adjusting wheel for bypass valve
All UWT's
not available separately
4
Hose olive G ¾ for ¾" hoses
UWT 3000
EOA 004
4
Hose olive G 1 ¼ for 1" hoses
UWT 6000,
UWT 10000
EOA 003
4
Hose clips for ¾" hoses
UWT 3000
EZS 015
4
Hose clips for 1" hoses
UWT 6000,
UWT 10000
EZS 016
1
Remote plug with soldering jumper
All UWT's
UD 641
Optional accessories:
Description
For units
LAUDA Cat. No
Overflow valve with range 1.0 –1.5 bar;
connections G1" internal thread, brass
-10 to +150 °C
UWT 10000
EV 066
With spring EVE 023

UWT circulation heat exchangers
12 Preparations YAWE0029 / 29 June 2018
5 Preparations
5.1 Siting and connection
View on the solder side of the con-
tact assignment of the remote plug
for socket 15N:
1 Remote switch-on
2 Common for 4, 5, 6
3 Remote switch-on
4 Pilot lamp ON
5 Overtemperature warning
6 Low level warning
PE Unit safety earth conductor

- Site the unit on a level surface.
- The unit must not be put into operation if its
temperature due to storage or transport has
been reduced below the dew point.
Wait approx. 1 hour.
- For operation, contacts 1 and 3 on the remote
socket 15N must be joined. To do this, use the
remote plug from the accessories supplied with
the unit.
- Further status signals are present on contacts 4,
5 and 6 of the remote socket 15N.
- Connect the external coolant inlet and return
(maximum pressure (8.1)).
- Connect the load to the laboratory circuit.
- Always ensure the largest possible inside di-
ameter in the external circuit (olives, hoses,
loads). This gives larger flow rates and therefore
better temperature stabilisation.
- Secure hoses against slippage by using hose
clips.
Mains voltage is present on the contacts on the socket 15 N.
Facility cooling supply
UWT
Laboratory circuit (application)

UWT circulation heat exchangers
YAWE0029 / 29 June 2018 Preparations 13
5.2 Filling
The circulation heat exchangers in the primary and laboratory circuits are designed for operation
with water or a glycol/water mixture.

Close the drain tap (located right at the bottom on
the back panel).
Remove the plug from the filling opening at the
front. Use a funnel for filling, if required.
Fill the unit with heat transfer liquid up to the top
level mark.
A low level warning occurs if the level is outside of
the normal range.
For easier venting of the pump, the outflow to the
laboratory cooling circuit (pump outflow) should be
open when first filling; otherwise the pump may be
permanently damaged.

The units are intended for use with water or glycol/water mixture in the coolant
circuit and laboratory circuit.
Only pressure-sealed loads can be connected.
Make sure that when connecting an external load, the liquid level does not fall
impermissibly through filling the load refill with liquid, if required.
Contaminated cooling liquid in the cooling circuit can lead to blockage of the
heat exchanger.
With unintentional closure of the laboratory circuit return, then with units with a
maximum discharge pressure > 1 bar pressures can arise which can damage
glass apparatus!
Observe the maximum permissible pressures for the connected apparatus.
With loads situated at a higher level and with the pump stopped and air seeping
into the thermostatic circuit, then even with enclosed circuits the external volume
can run empty, resulting in overflowing of the reservoir.
Normal range

UWT circulation heat exchangers
14 Preparations YAWE0029 / 29 June 2018
5.3 Draining / frost protection
If the unit is to be taken out of operation for a longer period of time or if ambient temperatures below
0 °C are to be expected, the unit must be drained. This must be carried out in two steps:
Draining the cooling liquid circuit:
Remove the cooling liquid hoses.
Reduce the set-point temperature. This causes the solenoid valve "Cooling liquid"
to open
(LED K 1 next to the temperature display illuminates).
Using compressed air or a similar gas applied to the cooling liquid inlet, drain the
cooling liquid circuit.
Alternatively: With the solenoid valve "Cooling liquid" switched on apply suction to
the connection "Cooling liquid outlet" using a waterproof industrial vacuum cleaner.
Draining the unit:
Switch off the circulation heat exchanger, withdraw the mains plug.
Let out the heat transfer liquid through the drain tap; fit a hose for this.
The drain tap is located right at the bottom on the back panel.
Unclip the hoses on the laboratory circuit.
Open the filling nozzle at the front.
With compressed air or similar gas blow strongly into the laboratory circuit to emp-
ty the heat exchanger.
Alternatively: First drain the bath contents into a suitable container and then apply
suction to the connection "Laboratory circuit return" with a waterproof industrial
vacuum cleaner (with the filling nozzle on the front of the unit open).

Switch off the unit before removing the hose connections.
Longer periods of dry running, i.e. with operation below the minimum level of the
bath, leads to bearing damage on the pump.

UWT circulation heat exchangers
29 June 2018 / 29/06/2018 Starting up 15
6 Starting up
6.1 Mains connection
Compare the details on the rating label (back of the unit) with the mains voltage.
Only connect units to sockets having a safety earth conductor (PE).
No liability is accepted for incorrect mains connection.
Ensure that a cooling liquid connection and the external load are correctly con-
nected.
Ensure that the unit is filled according to Chapter 5.2.

Note for electric installation on site:
The devices must be protected with a 16 ampere circuit breaker fitted during installation.
Exception: Devices with 13 ampere UK plugs.
6.2 Switching on
The circulation heat exchanger is already filled and connected.
Switch on the mains switch at the right side of the control section. The digital display indi-
cates the momentary bath temperature.
If despite a sufficient level no bath liquid is passed, an air cushion in the laboratory circuit
may be preventing the pump filling with liquid. Vent the laboratory circuit at its highest
point.
The prevailing discharge pressure is indicated on the pressure gauge at the front of the unit
(only UWT 6000 and UWT 10000). This enables conclusions to be made regarding the de-
livery rate and any disturbances.
Press the set-point indicator key .
Changing the set point: While the set point is being displayed, adjust the set point with the
keys and . Then confirm the new value with the key (press for at least
2 s). Then the actual value is displayed again.
The LED "K 1" (next to the temperature display) illuminates when the solenoid valve "Cool-
ing liquid" is switched on.
The red alarm lamp illuminates when the overtemperature threshold is reached. Factory set-
ting 25 °C. The yellow alarm lamp illuminates when the level falls below the minimum bath
level. These disturbance signals as well as an operating signal and a "Remote on" contact
are present on the remote socket (back of the unit). For starting up, the unit must be con-
nected to a remote plug (connection on socket 15N between PIN 1 and 3). The pump in
the unit continues to run even with a fault condition.
To limit the switching frequency of the solenoid valve a minimum stop period (delay time) of
12 s has been programmed at the factory.

UWT circulation heat exchangers
16 Starting up YAWE0029 / 29 June 2018
Setting the switching threshold for overtemperature:
Factory setting is 25 °C. Setting in the complete temperature range of the unit is possible.
The setting takes place at the configuration level. Programming (setting) of the operating
parameters is possible at the configuration level. To do this, press the key for 10 s.
First SEt is displayed and then after 10 s St1.
The menu points can be selected with the keys and . Select the menu point
St2 to set the overtemperature. The entry is activated with the key. Then select the
value with and . Confirm the changed or new value with the key (press
for at least 2s). The return to the normal menu occurs automatically by a timeout of 10 s.
6.3 Adjusting the outflow pressure with the bypass valve

The internal bypass valve is set at the factory to 0.5 L/min.
Adjustment is only necessary if the bath temperature does not reach a new,
lower set point with a closed laboratory circuit (no flow).
Only adjust the internal bypass if the flow is unsuitable.
Withdraw the mains plug and open the unit.
Close the laboratory circuit (no flow now present).
Release the side of the bypass valve connected to the laboratory circuit return and extends
it with a hose which leads into a beaker.
Connect the mains again and switch on the unit.
Dangerous electrical voltage inside the unit.
This adjustment may only be carried out by specialist personnel!
The valve is located inside on the back panel of the unit.
Adjust the valve with the enclosed hand wheel to 0.5 L/min. Return the heat transfer liquid
to the bath.
Disconnect the mains and close the housing.

UWT circulation heat exchangers
YAWE0029 / 29 June 2018 Maintenance 17
7 Maintenance
7.1 Cleaning
Withdraw the mains plug before cleaning the unit!
Cleaning can be carried out with water with a few drops of a surfactant (washing-up liquid) added and
with the aid of a damp cloth.
No water should penetrate into the control section!

Carry out appropriate decontamination if dangerous material is spilt on or in the
unit.
The cleaning or decontamination method is determined through the user's spe-
cialist knowledge. In case of doubt contact the manufacturer.
7.2 Servicing and repair
Withdraw the mains plug before all servicing and repair work!
Have repairs in the control section carried out only by specialists!
LAUDA circulation heat exchangers need practically no servicing. If the temperature stabilising liquid in
the laboratory circuit becomes contaminated, it should be renewed.

Contaminated cooling liquid in the cooling circuit can lead to blockage of
the heat exchanger, pump and bypass valve.
The following safety fuses are located on the mains circuit board. If a fuse blows, re-
place it only by a fuse with the specified data:
Mains fuse F2 and F3 6.3A slow-blow (EEF 006) (mains indicator lamp no
longer illuminates).
Low voltage fuse F1 0.2A quick-blow (EEF 002) (temperature display does
not illuminate).

UWT circulation heat exchangers
18 Maintenance YAWE0029 / 29 June 2018
7.3 Spare parts ordering and rating label
When ordering spares please quote instrument type and serial number from the rating label
This avoids queries and supply of incorrect items.
Your contact for service and support
LAUDA Service Constant Temperature Equipment
Telephone: [phone] (English and German)
Fax: [phone]
E-Mail [e-mail]
We are available any time for your queries, suggestions and criticism!
LAUDA DR. R. WOBSER GMBH & CO. KG
Pfarrstraße 41/43
97922 Lauda-Königshofen
Germany
Telephone: [phone]
Fax: [phone]
E-mail [e-mail]
Internet http://www.lauda.de