Barkey warming center III DTM User manual

Service manual
Barkey warming center III DTM
with digital temperature display
From SN 160 5986
Version 1.00 EN
Manufactured by:
Barkey GmbH & Co. KG
Gewerbestrasse 8
D - -33818 Leopoldshoehe
Germany

Contents
Barkey GmbH & Co. KG - Gewerbestrasse 8 - 33818 Leopoldshoehe – Germany - Head Office: [phone]
Customer Service: [phone] Fax: [phone] - e-mail: [email protected]
Service manual
Barkey warming center III DTM
Contents
1 Introduction .......................................................................................................................... 1
1.1 Important things to observe ................................................................................................... 1
1.2 Pictograms, signal words and symbols................................................................................. 2
1.3 Target groups......................................................................................................................... 2
1.4 Disclaimer of liability .............................................................................................................. 3
1.5 Copyright................................................................................................................................ 3
2 Safety information ............................................................................................................... 4
2.1 Safety information for the carrying out of service work.......................................................... 4
2.2 Safety information regarding environmental influences......................................................... 5
3 Displays and controls and symbols .................................................................................. 6
3.1 Operating panel ..................................................................................................................... 6
3.2 Symbols used ........................................................................................................................ 7
4 Operation .............................................................................................................................. 8
4.1 Display elements.................................................................................................................... 8
4.1.1 Operating display ................................................................................................................... 8
4.1.2 Heating activity display .......................................................................................................... 9
4.1.3 Fault display........................................................................................................................... 9
4.1.4 Temperature display .............................................................................................................. 9
4.2 Displays and controls........................................................................................................... 10
5 Technical safety inspections (TSI)................................................................................... 11
5.1 Visual inspection .................................................................................................................. 11
5.2 Temperature check .............................................................................................................. 12
5.3 Checking the overtemperature protection............................................................................ 13
5.4 Measurements in accordance with DIN EN 60601-1........................................................... 15
5.5 Functional inspection ........................................................................................................... 16
5.6 Comments............................................................................................................................ 16
5.7 TSI has been passed ........................................................................................................... 16
5.8 Affixing the test sticker ......................................................................................................... 16
6 Adjustments ....................................................................................................................... 17
6.1 Adjusting the temperature display ....................................................................................... 17
6.2 Adjusting the temperature in the heating chamber.............................................................. 18
6.3 Adjusting the electronic overtemperature protection ........................................................... 19
7 Service work....................................................................................................................... 20
7.1 Functional circuit diagram.................................................................................................... 21
7.2 Removing and refitting the heater insert.............................................................................. 22
7.3 Replacing the regulator circuit board ................................................................................... 24
7.4 Replacing the heater............................................................................................................ 26
7.5 Replacing the transverse airflow fan.................................................................................... 27
7.6 Replacing the mechanical overtemperature protection ....................................................... 30
7.7 Replacing the power switch ................................................................................................. 32
7.8 Replacing the fuseholder .....................................................................................................33
7.9 Replacing the microswitch ................................................................................................... 34
7.10 Replacing the keyswitch ...................................................................................................... 35
7.11 Replacing fuses ................................................................................................................... 37
7.12 Cleaning and disinfection..................................................................................................... 38

Contents
Barkey GmbH & Co. KG - Gewerbestrasse 8 - 33818 Leopoldshoehe – Germany - Head Office: [phone]
Customer Service: [phone] Fax: [phone] - e-mail: [email protected]
Service manual
Barkey warming center III DTM
7.13 Service tools.........................................................................................................................39
8 Appendix .............................................................................................................................42
8.1 Cross-section of Barkey warming center III DTM ................................................................42
8.2 Spare parts list .....................................................................................................................43
8.3 Address / contact..................................................................................................................44
8.4 Inspection log for technical safety inspection.......................................................................44

Introduction
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Service manual
Barkey warming center III DTM
1 Introduction
This service manual is intended as an introduction to carrying out technical safety inspec-
tions (in brief TSI) and to carrying out service work on the Barkey warming center III
DTM.
1.1 Important things to observe
WARNING
Read this service manual and the instruction manual thoroughly through before
you operate the device or carry out service work.
This should ensure that no incorrect handling can take place which could lead to
faults or damages.
You should also observe the requirements made on the qualifications of service
personnel as stated in Chapter 1.3.
It is imperative that the installation conditions and safety information described in the
service manual and in the instruction manual are observed during service work on the
device. This ensures that the device is not used improperly such that patients and users
of the device could be endangered, and prevents damage to the device.
WARNING
Medical electrical devices are subject to particular precautionary measures with re-
gard to EMC (electromagnetic compatibility). Please ensure that the device is in-
stalled and operated in accordance with the EMC guidelines contained in this in-
struction manual.
Barkey GmbH & Co. KG accepts no liability for damages which are caused by disregard-
ing this service manual or the instruction manual.

Introduction
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Service manual
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1.2 Pictograms, signal words and symbols
Warnings, and especially advice, are labelled using the following pictograms and symbol
words in this service manual .
WARNING
If not observed: hazards to personnel.
CAUTION
If not observed: hazards for equipment, the device or elementary
device functions.
NOTE
Additional helpful guidelines and information.
(the "i" stands for "information".
You will find the following symbol in instructions about the use and maintenance of the
device:
►Instruction stage.
carry out this stage as indicated.
NOTE
The symbols representing the displays and controls and device displays, in addi-
tion to the symbols on device labels, are listed in Chapter 3 of this service manual
together with their meanings.
1.3 Target groups
These service manuals are intended for specialist medical technicians who:
•can substantiate a recognised qualification as an electrical appliance electrician or
equivalent
•have been trained by the manufacturer through training courses in the implemen-
tation of
technical safety inspections and in the implementation of service work on the
Barkey warming center III DTM.
WARNING
Only personnel who have fulfilled these qualifications may carry out service work
on the device.

Introduction
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Service manual
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1.4 Disclaimer of liability
The manufacturer and/or its subsidiary companies are only then liable for the safety, reli-
ability and performance of the system if all operating procedures, adjustments and repairs
are carried out by suitably trained and qualified personnel; if all alterations to the device
have been approved in writing by the manufacturer and have been carried out by suitably
trained and qualified personnel; if the electrical installation within the treatment room sat-
isfies local regulations and, if applicable, IEC requirements; if the device is used in accor-
dance with the published operation and service manual (this documentation).
1.5 Copyright
This service manual, including all images contained within, is protected by copyright
regulations. Translation, duplication, reprinting, extraction of images, reproduction using
photographic technology and saving and processing in electronic systems, even only ex-
cerpts, in addition to any alterations requires the written authorisation of
Barkey GmbH & Co. KG. Any further usage which goes beyond using the contents de-
scribed in connection with the product purchased is not permitted.
Third party products, protected trademarks etc. are always stated without reference to the
registration or copyright status. Existing industrial property rights and registered trade-
marks will be explicitly acknowledged.
We reserve the right to make printing errors, mistakes and revisions which serve techni-
cal progress, or which are necessary due to changes in regulations.

Safety information
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Service manual
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2 Safety information
2.1 Safety information for the carrying out of service work
WARNING
Read this service manual and the instruction manual thor-
oughly through before carrying out a TSI or service work.
Observe the safety information and the information on electro-
magnetic characteristics and protective distances in the in-
struction manual.
All electrical installations must comply with the relevant appli-
cable regulations and standards in addition to the specifica-
tions stated by the manufacturer.
Only mains power cables supplied by Barkey GmbH & Co. KG
which are designed for the device rated voltage and rated cur-
rent may be used.
You must remove the plug from the mains before opening the
device.
A technical safety inspection must be carried out annually by
qualified service personnel or employees of Barkey GmbH &
Co. KG.
All inspection steps for the TSI which have to do with tem-
perature measurements must be carried out at a room tem-
perature of
22° Celsius ± 1.0 K.
During measurements, the device may not be subjected to
direct sunlight or draughts, or any other influences which might
influence the measurement.
The heating device must be located on a level, horizontal sur-
face. When the device is in location, the front castors must be
locked.
Before the heating device is moved, the mains power cable
must be unplugged from the wall socket.
Moving the heating device may only take place slowly and
without temperature-regulated goods at a pace slower than
walking pace. If moving takes place too quickly, or abrupt ac-
celeration or braking is used, the doors can open unintention-
ally despite the closing technology used (magnetic sealing
frame).
Only move the heating device across level surfaces. Do not
move it across steps, inclines or cables etc.
If the temperature display is blinking, the heating device may
not be used for the warming of heating goods.
If the fault display illuminates or flashes, the heating device
must be inspected in the manufacturer's works or by medical
technicians who have been trained in the overhaul and exami-
nation of this device, and overhauled if necessary.

Safety information
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Service manual
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WARNING
Temperature-regulated goods which are stored in the tem-
perature-regulated space when a fault message is displayed
must be inspected for usability before use, because they were
subjected to a temperature higher than 46°C.
CAUTION
Overhaul measures and device modifications may only be
carried out by qualified service personnel or employees of
Barkey GmbH & Co. KG.
2.2 Safety information regarding environmental influences
WARNING
The influence of stronger electromagnetic fields (e.g. through
the use of HF therapy or surgical devices) can lead to malfunc-
tions in the device. If such malfunctions occur, increase the
distance between the device and the device causing the dis-
turbance, or operate the devices at separate times. The device
works perfectly within the limit values set in the EN 60601-1-2
standard. The device can be influenced outside the limit values
set by EN 60601-1-2.
Portable and mobile high-frequency communication equipment
such as mobile telephones can influence the device.
The device may not be used in the immediate vicinity of
•flammable materials (e.g. gases, liquids),
•flammable mixtures of anaesthetic substances with air,
•flammable mixtures of anaesthetic substances with oxygen
or laughing gas
whose point of ignition is below 50°C. It is imperative that the
device is not used in areas in which alcoholic disinfectants or
anaesthetising substances are being used simultaneously.
Observe the safety information and the information on electro-
magnetic characteristics and protective distances in the in-
struction manual.
The device may not be set up or operated in the immediate
vicinity of devices with high heat output.

Displays and controls and symbols
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3 Displays and controls and symbols
3.1 Operating panel
The operating panel of the Barkey warming center III DTM is located on the front of the
device. It is integrated into the heating cabinet front face. The following figure shows the
complete operating panel as an overview.
Figure 1: Barkey warming center III DTM operating panel
An acoustic signal transmitter signals faults in the device.
Please also see the following table for the displays and controls.
Toggle switch for turning the device on and off.
I = on
0 = off
Operating display. The green light (LED) shows that the device has
been switched on. It shows the device operating condition.
Heating activity display. The yellow lamp (LED) shows the heater activ-
ity. It illuminates when the heater is active.
Fault display. The red light (LED shows that a fault has occurred. The
red LED illuminates or blinks if a fault occurs. An acoustic signal is also
sounded.
The temperature display displays the current air temperature in the
temperature-regulated space in°C.
STK-e: Inspection of the electronic overtemperature protection takes
place in this keyswitch position. The temperature display blinks.
The Barkey warming centre III DTM may not be used for warming
and keeping warm in this keyswitch position.
STK-m: Inspection of the mechanical overtemperature protection takes
place in this keyswitch position. The temperature display blinks.
The Barkey warming centre III DTM may not be used for warming
and keeping warm in this keyswitch position.
Operation: The Barkey warming center III DTM can be used for correct
and proper use with the keyswitch in this position.

Displays and controls and symbols
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Service manual
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3.2 Symbols used
Labels showing printed symbols are affixed to the device. These have the following
meaning:
IPX1 This symbol shows that the device is protected against dripping water in
accordance with IEC 601-1 in the intended operating conditions.
2008
This symbol shows the year of manufacture in the four-digit number.
0123
This symbol declares that the device conforms with EU Directive
93/42/EWG of 14th June 1993 for medical products. The four-digit
number identifies the stated location (TÜV Product Service) which
monitors the manufacturer's quality assurance system.
This symbol (on a label inside the device) informs you of the earth con-
nection.
This symbol identifies the month and the year in which the next safety
inspections must be carried out.
This symbol advises you that the instruction manual must be carefully
read through before operating the device.
This symbol indicates that the product may not be disposed of with
normal domestic waste. This product must be disposed of by specialist
disposal companies or returned to the manufacturer for disposal.
This symbol advises you that the device must be disconnected from the
mains before opening the device housing.

Operation
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4 Operation
4.1 Display elements.
Display elements are located on the front of the Barkey warming center III DTM. They are
integrated in the front face of the control module. The following illustration shows an
overview of the display elements.
Operating display Fault display
Heating activity display Temperature display
Figure 2: Display panel
The following subsections explain the meaning of individual display elements.
4.1.1 Operating display
The operating display indicates the heating device operating status.
Status Meaning
Off Power supply is not available.
The heating device is not switched on.
On Power supply is available.
The heating device is switched on and active.
Flashing Power supply is available.
The heating device is switched on.
The door is open.
The circulating air temperature regulation is switched off.
An acoustic signal will sound after two minutes
Signal to remind you that the door is open.

Operation
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4.1.2 Heating activity display
The heating activity display indicates the current heater condition. If the heating device is
switched on and the operating display is permanently illuminated, the display has the fol-
lowing meaning:
Status Meaning
Off The heater is currently not active.
It is not being triggered by the temperature regulation
because the temperature is at the required setting.
On Blinking. It is being triggered
by the temperature regulation.
Blinking The heater is active. It is only triggered briefly by the
temperature regulating system.
4.1.3 Fault display
The faults display indicates malfunctions. If the heating device is switched on, this display
has the following meanings:
Status Meaning
Off There are no malfunctions.
On The mechanical overtemperature protection has triggered.
Blinking The temperature regulation temperature sensor is defective.
or
The electronic overtemperature protection has triggered.
WARNING
Temperature-regulated goods which are stored in the temperature-regulated space
when a fault message is displayed must be inspected for usability before use, be-
cause they were subjected to a temperature higher than 46°C.
4.1.4 Temperature display
The temperature display displays the current air temperature in the temperature-
regulated space in°C. The air temperature is measured representatively at the air duct
output.
WARNING
The temperature display flashes if the electronic or mechanical overtemperature
protection test function is activated via the keyswitch. The heating device may not
be used for heating temperature-regulated goods in this condition.

Operation
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4.2 Displays and controls
For normal operation, only the power switch on the right-hand side of the operating panel
of the Barkey warming center III DTM is of interest. The temperature has been set at the
works, so that once the device has been switched on no further displays and controls are
necessary.
If the door is opened, the circulating air temperature regulation switches off automatically
and the operating display (green lamps) flashes. If a fault is present, this is indicated by
the fault display (red lamps) illuminating or flashing.
To switch the device on, press the rocker
switch into position I.
Figure 3: Power switch
The TSI keyswitch on the right-hand side of the operating panel is also required for car-
rying out the TSI. The TSI keyswitch actuates special testing conditions in order to enable
checking of the electronic and mechanical overtemperature protection function.
Switching over to one of the two special
testing conditions can only take place
using the correct key. Testing of the elec-
tronic overtemperature protection takes
place in the "TSI-e" position. The "TSI-m"
position is used to test the mechanical
overtemperature protection.
Figure 4: TSI keyswitch.
WARNING
The temperature display flashes if the electronic or mechanical overtemperature
protection test function is activated via the keyswitch. The heating device may not
be used for heating temperature-regulated goods in this condition.

Technical safety inspections (TSI)
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5 Technical safety inspections (TSI)
The Barkey warming center III DTM temperature setting is dependent on normal ageing
and the tolerances of the electronic components, as are all electronic devices.
In order to guarantee the temperature settings on the Barkey warming center III DTM
permanently within the stated tolerances, an annual technical safety inspection (TSI)
must be carried out by qualified service personnel or employees of Barkey GmbH & Co.
KG (see § 6 of the German MPBetreibV*).
The safety inspection should include the prescribed annual electrical safety check on the
Barkey warming center III DTM in addition to other points listed here.
WARNING
Only qualified service personnel and employees of Barkey GmbH & Co. KG may
carry out technical safety inspections.
WARNING
In order to carry out safety inspections, you must remove all temperature-regulated
goods from the temperature-regulated cabinet and store them in accordance with
their respective manufacturer's instructions.
NOTE
The date for carrying out the next technical safety inspection is printed on the date
label on the inside of the device.
Technical safety inspections to be carried out on the Barkey warming center III DTM are
mainly concerned with a temperature check in the temperature-regulated cabinet using a
calibrated thermometer, and testing of the overtemperature protection functions.
Device data must be entered at the top of every page in the inspection log. This informa-
tion must be entered on every page so that all pages of an inspection log can be clearly
allocated to one particular device.
►Enter the name and address.
►Enter the serial number from the nameplate.
►Enter the setup measurement date in the "Setup measurement" box.
►The current date must be entered in the date box.
5.1 Visual inspection
►First, carry out a visual check on the Barkey warming center III DTM to be inspected.
The visual inspection must include all points stated in the inspection log in point 1.

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5.2 Temperature check
The temperature check is used to check correct settings of the temperature regulation
system. The temperature in the centre of the temperature-regulated cabinet is measured
using a reference thermometer.
The requirements on the reference thermometer are:
•temperature range of minimum 20°C ... 50°C
•accuracy of at least 0.1 K
•The thermometer must be calibrated.
You can order a suitable reference thermometer from Barkey GmbH & Co. KG.
WARNING
The room temperature must be at 22.0°C ±1.0 K during the entire temperature
check. Incorrect values will be measured if this is not the case.
►Fix the thermometer in the middle of the centre shelf. When doing so, ensure that the
thermometer measuring head is located freely in the air to be warmed.
Locate the display section of the ther-
mometer inside the temperature-regulated
cabinet so you can read the temperature
through the glass door when it is closed.
When using the thermometer, and when
evaluating the measured values, observe
the information supplied by the ther-
mometer manufacturer about surrounding
conditions.
Figure 5: Reference thermometer
►Enter the type and the serial number of the reference thermometer in the inspection
log.
►Measure the current room temperature and enter it in the inspection log.
►You can now operate the Barkey warming center III DTM again as described in the
instruction manual.

Technical safety inspections (TSI)
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►Wait until the display shows a temperature of 42°C and the measured temperature in
the heating chamber is stable. If the heating chamber is cold, this will take around 60
minutes. If the device is warm, the waiting period will be shorter.
►Once the temperature reached has become stable, enter the temperature of the ref-
erence thermometer and the temperature displayed in the Barkey warming center III
DTM in the inspection log.
WARNING
If the temperature shown by the reference thermometer lies outside the prescribed
tolerance of 42°C ± 3°C, the Barkey warming center III DTM needs to be read-
justed (see chapter 6.2). The values shown on the device temperature display
must agree with the measured value of the reference thermometer by ± 1°C. If the
discrepancy is larger, the Barkey warming center III DTM needs to be readjusted
(see chapter 6.1). The TSI must be repeated afterwards.
►Take the reference thermometer out of the Barkey warming center III DTM heating
chamber.
5.3 Checking the overtemperature protection
The Barkey warming center III DTM is fitted with two independent mechanisms to protect
it from high temperatures.
One of these is the electronic overtemperature protection. In this case, an independent
electronic system continuously checks the temperature in the air duct. If the measured
temperature becomes higher than 46°C, the heater is switched off. The error display on
the front panel also blinks.
The electronic overtemperature protection fault message can be reset by turning the de-
vice off and then on again. If the cause of the fault has not been rectified, the error mes-
sage will be displayed once again.
There is also an independent mechanical overtemperature protection system. The me-
chanical overtemperature protection is fitted directly on the heater and serves to protect
the entire device. If the temperature of 63°C at the heater is exceeded, this is switched off
permanently. The error display on the front panel also illuminates permanently. A tem-
perature of 63°C at the heater is equivalent to a temperature of around 51°C in the heat-
ing chamber.
WARNING
The room temperature must be at 22.0°C ± 1.0 K during the entire overtemperature
protection check. Incorrect values will be measured if this is not the case.
WARNING
Any overtemperature protection checks must be carried out when the
Barkey warming center III DTM has been heated up to 42°C. If this is not the case,
incorrect values will be measured during the overtemperature protection check.

Technical safety inspections (TSI)
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►If the Barkey warming center III DTM heating chamber has not already been warmed
up to 42°C, operate the device as described in the instruction manual. Wait until the
display shows a temperature of 42°C and the measured temperature in the heating
chamber is stable. If the heating chamber is cold, this will take around 60 minutes. If
the device is warm, the waiting period will be shorter.
►Switch the Barkey warming center III DTM off.
►Turn the keyswitch to the "TSI-e" position.
►Switch the Barkey warming center III DTM on.
The heater is permanently in operation at this "TSI-e" setting, and the temperature in the
heating cabinet increases. The temperature display will flash to show that the TSI test
function is activated.
As soon as the electronic overtemperature protection triggers, the fault display flashes
and an acoustic signal sounds for around six seconds.
►Read the value of the temperature display when the electronic overtemperature pro-
tection is triggered and enter this in the inspection log.
WARNING
If the value determined lies outside the prescribed tolerance of 46°C ± 1°C, the
Barkey warming center III DTM needs to be readjusted (see chapter 6.3). The TSI
must be repeated afterwards.
►Switch the Barkey warming center III DTM off.
►Turn the keyswitch to the "TSI-m" position.
►Switch the Barkey warming center III DTM on.
In "TSI-m" check status, the heater is permanently triggered and the electronic overtem-
perature protection is bypassed. The temperature in the heating cabinet increases, and
activation of the TSI check function is indicated by the temperature display blinking.
As soon as the mechanical overtemperature protection triggers, the fault display illumi-
nates permanently and an acoustic signal sounds for around six seconds.
►Read the value of the temperature display at the time the mechanical overtempera-
ture protection is triggered.
►Enter the trigger value in the inspection log.
WARNING
If the value determined lies outside the prescribed tolerance of 51°C ± 3°C, the
mechanical overtemperature protection needs to be replaced (see
chapter 7.5). The TSI must be repeated afterwards.
►Switch the Barkey warming center III DTM off.
►Turn the keyswitch to the "Operation" position.

Technical safety inspections (TSI)
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►Allow the Barkey warming center III DTM to cool down for 30 minutes with the door
open.
►Reset the triggered mechanical overtemperature protection.
The overtemperature protection reset pin
is located on the underside of the heater
inset. Press the reset pin in with a pointed
object such as a ballpoint pen about 1
mm.
Figure 6: Reset pin for mechanical overtemperature protection
5.4 Measurements in accordance with DIN EN 60601-1
Safety inspections must be carried out in accordance with DIN EN 60601-1 in its valid
edition. When carrying out the inspection, you must also read and observe the test
equipment operating manual.
►Enter the type and serial number of the test equipment in the inspection log.
►Connect the Barkey warming center mains cable to your test equipment.
NOTE
The power switch must be switched on during the test (position "I").
►Carry out all measurements in accordance with your test equipment operating man-
ual.
In the adjacent figure you can see the
measuring points which the test equip-
ment probe must be connected to for
measuring the protective earth and
ground conductor resistance.
Figure 7: Measuring points for safety check
►Enter the values determined for the earth conductor resistance, insulation resistance,
earth and housing leakage current in the inspection log.
►Carry out an evaluation based on the measured results, and taking into account pre-
vious electrical safety measurements, to determine whether the device meets the
safety requirements.

Technical safety inspections (TSI)
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5.5 Functional inspection
►Switch the Barkey warming center III DTM on.
►The green LED on the display panel illuminates to confirm that the device has been
switched on. Enter whether the green LED illuminates in the inspection log.
►The temperature of the Barkey warming center III DTM must be displayed in the tem-
perature display after switching on. The temperature display should not be blinking.
Enter whether the temperature display is permanently illuminated in the inspection
log.
►Open the cabinet door.
►If the door is open, the green LED in the display panel blinks. In addition, an acoustic
signal is given off after 2 minutes to remind you that the cabinet door is open. Enter
whether the green LED is blinking in the inspection log.
►Enter whether an acoustic signal was sounded after 2 minutes in the inspection log.
►Close the cabinet door.
►The acoustic signal will stop and the green LED on the display panel will be perma-
nently illuminated. The circulating air temperature regulation will be activated at the
same time. This will be audible due to the ventilator noise. Enter whether the circu-
lating air temperature regulation is functioning in the inspection log.
5.6 Comments
►This is for entering comments, for example information relevant to subsequent tests.
5.7 TSI has been passed
►If all the points for the TSI listed above were completed positively, then the TSI in-
spection has been passed. Please tick the box marked "yes".
5.8 Affixing the test sticker
If the TSI test has been passed, the test sticker must be affixed. The test sticker shows
the user the date for the next TSI.
►Attach the test sticker with the date of the next inspection to the Barkey warming
center III DTM. The best location to this is the left-hand side of the incline on the
heater insert. The label should be fixed so that the arrow is pointing to the month in
which the inspection is due.
The name and address of those carrying out the test must be entered in the inspection
log. Correct implementation of the TSI inspection must be confirmed in the inspection log
with statement of name, date and signature.
WARNING
The Barkey warming center III DTM must be allowed to cool down to a temperature
below 42°C in the heating chamber after the TSI before it is used for warming
again.