Danfoss XB Manuel D'instructions page 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.
Media
Danfoss heat exchangers type XB have been
developed for use in water / water applications.
(PED fluid group 2)
Warning of high pressure and temperature
The maximum temperature (TS) of the medium
of the heat exchanger has been set to +180°C.
The maximum working pressure (PS) can
be either 16 bar or 25 bar please refer to the
product 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 is not ensuring against
excessive temperatures and pressures. The
system designer or user must design or operate
the system so that pressures and temperatures
cannot increase unintended beyond the max.
working pressures and temperatures. Neither
when in service nor when the system is out
of service. Please also refer to the mounting
section below.
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.
Warning against exogenous forces.
The heat exchanger has not been designed to
withstand excessive forces from earth quake,
wind, fire, vibration, missing or failing support,
excessive forces from the piping etc.
It is the system designer or end users
responsibility to protect the heat exchanger and
reduce the damage risk.
Please also refer to the mounting section below.
DEN-SMT/SI
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.
❶
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.
❷
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
①
2-pass heat exchanger
②
❸
Mounting
The heat exchanger must be mounted with the
bracket designed for the purpose and offered
by Danfoss (see datasheet) or another suitable
bracket, which releases it from mechanical
stress on connections.The heat exchanger
should be mounted in vertical position. The
space between adjacent heat exchangers,
walls and other components, must be at least
100mm and leave enough space for service
and maintenance. (e.g. remove insulation,
replacing and cleaning of the heat exchanger).
Furthermore there can be local standards and
regulation which must be met.
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.
②
VI.KA.A4.3S
© Danfoss 09/2012
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.
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.
❹
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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