Danfoss XB Bedienungsanleitung Seite 3

ENGLISH
Safety notes
To avoid injury of persons and damages
to the device, it is absolutely necessary
to carefully read and observe these
instructions.
Necessary assembly, start-up and
maintenance work must only be performed
by qualified and authorized personnel.
Warning of high pressure and
temperature
The maximum temperature of the medium
of the heat exchanger has been set to
+180°C.
The maximum operating pressure of the
heat exchanger is 25 bar.
Be aware of the installation's permissible
system pressure.
The risk of equipment and personal
accidents will increase dramatically if
the recommendations as to maximum
operating pressure are ignored.
The heat exchanger must be equipped
with a safety valve.
Warning of hot surfaces
The heat exchanger has hot surfaces,
which can cause skin burns. Please observe
extreme caution in close proximity to the
heat exchanger.
Warning of hot water
District heating water can be very hot and
under high pressure. Consequently, the
station must be emptied of water prior to
dismounting.
Warning of transport damage
Before the heat exchanger is taken into use,
please make sure that the heat exchanger
has not been damaged during transport.
Water quality
To avoid corrosion and leakage in the
copper brazed plate heat exchangers
please observe Danfoss recommendations
for the water quality in the guideline on
www.heating.danfoss.com
(Documentation).
Delivery
The heat exchangers can be delivered in
any position. The recommended position
is however lying on the end plate. If the
heat exchangers are delivered in bulk, it is
necessary to insert a protective material
between them.
The heat exchanger must not be
transported or stored on the pipe
connections.
DH-SMT/SI

Connections
T11 – Primary side in
T12 - Primary side out
T112 - Primary side second
inlet (two pass)
T21 - Secondary side in
T22 - Secondary side out
T212 - Secondary side second
inlet (two pass)
The heat exchanger includes thread or
flange connection.

Operation
The medium must flow through the heat
exchanger in the opposite direction
(counter current). The brazed heat
exchangers are counter current and cannot
be opened.
The task of the heat exchanger is to transfer
heat from the primary to secondary flow
through a heat transfer plate so that
each flow does not mix with the other. To
intensify the heat exchange effect, each
plate is pressed in V-shape. The adjacent
plate is turned 180° and thus creating a grid
of intertwined channels.
 1-pass heat exchanger
 2-pass heat exchanger

Mounting
The heat exchanger is mounted on its own
base without foundation and it needs no
bolting.
The heat exchanger should be mounted in
vertical position.
The space between adjacent exchangers
must be at least 100 mm. 
There should be left enough room around
the heat exchanger for service and
maintenance (e.g. insulation, replacing heat
exchanger, cleaning) and always comply
with local standards.
All pipes connected to the heat exchanger
are recommended to be equipped with
shut-off valves so that the heat exchanger
can be removed for maintenance purposes.
A safety valve must be installed between
the heat exchanger and the shut-off
valves on the secondary side of the
heat exchanger. If the safety valve is not
installed, thermal expansion of fluid might
destroy the heat exchanger when the
shut-off valves are closed. 
T11 – Primary side in
T22 - Secondary side out
Also the pipes to be connected must be
mounted so that the strain caused by e.g.,
thermal expansion, does not harm the heat
exchanger.
The pipes must be equipped with brackets
to prevent any torsional stress to be
concentrated at the heat exchanger's pipe
connections.
VI.KA.A3.3S
© Danfoss 11/2010
Filling the system, start-up
Before starting up the heat
exchanger, check that:
- Pipe connections comply with the
plans.
- Drain valves are closed.
- The heat exchanger is equipped with a
safety valve.
Heat exchanger start-up
1. Fill the heat exchanger with liquid and
raise the pressure slowly to working
pressure.
2. Open the shut-off valves and observe
the operation of the heat exchanger
(e.g. temperature, pressure, external
leakages).
Putting out of operation
1. Close the heat exchanger's shut-off
valves slowly.
2. Stop the circulation pumps.
3. Do not drain the heat exchanger, even
if the heat exchanger will be shut down
for several days or longer.
Drain the heat exchanger if a shutdown
would cause a danger of freezing.

Pressure test
The test pressure (PT) for heat exchanger,
see the table.
Storage
If the heat exchangers must be stored,
check that they are protected as well as
possible from stress caused by changes in
weather.
Cleaning the heat exchange plates
Backwash
The backwash removes fouling that has
accumulated on the surface of the plate.
Clean water is flushed with high speed
into the primary and / or secondary side in
the opposite direction from the one used
during normal operation.
The heat exchanger can also be washed
with a cleaning compound, approved
by Danfoss (e.g. Kaloxi® or Radiner FI
liquid cleaner concentrate), which is
environmentally friendly and can be
disposed of through a normal sewer.
After using a cleaning compound, the heat
exchanger must be flushed thoroughly
with fresh water.
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