Danfoss XG User Manual
Page 4
DH-SMT
VI.KA.B5.3C
© Danfoss 09/2009
4
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
+150 °C. The max. operating pressure of
the heat exchanger is 16 bar (25 bar for
special versions; please refer to the product
data label). 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 transport damage
Before the heat exchanger is taken into use,
please make sure that the heat exchanger
has not been damaged during transport.
Delivery
The heat exchangers can be delivered
in upright position. The recommended
position is however lying on the front end
plate. If the heat exchangers are delivered
in bulk, it is necessary to insert a protective
material between them.
Do not transport or store the heat
exchanger on the pipe connections!
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 gasketed heat
exchangers are counter current and can 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
XG14..., XG18..., XG20..., XG40..., XG31..., XG50...
1-pass heat exchanger
XG10...
2-pass heat exchanger
lifting
For a heat exchanger in upright position:
1. Lift the heat exchanger from the pallet
– e.g. with straps. Place the straps as
indicated in the picture.
2. Lower the heat exchanger onto its base
on an even floor.
For a heat exchanger in horizontal
orientation:
1. Lift the heat exchanger from the pallet
– e.g. with straps. Place the straps as
indicated in the picture. Take care
that the pipe connections of the heat
exchanger are not be damaged.
2. Lower the heat exchanger onto its base
on an even floor.
Mounting
The heat exchanger is mounted on its own
base and it needs no bolting. Prepare the
foundation if necessary, always according
to local regulations.
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 opened 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.
Assembly dimensions
If foundation is required for mounting,
following dimensions for assembly can be
used to evaluate the size of the foundation.
n= number of plates
Mounting bracket
End rear
Plate pack
End front
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.
service
For instructions of:
- Cleaning of plates
- Gasket replacement
- Opening and reassembling
please refer to “Service and repair work for
XG”. You can download it from web page
www.heating.danfoss.com or get from a
local Danfoss sales representative.