Alfa Laval 3450021401 Manual De Instalación página 5

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11) Volume of each space.
12) Fluid group.
13) Information unique to the customer.
14)* Possible locations of connections.
15) Bar code information.
16) Space for mark of approval.
*) Sketch on nameplate showing possible locations of
connections depending on heat exchanger execution.
Caution. The heat exchanger must be installed
and operated in such a manner that no risk of
injury to personnel and damage to property will
be incurred.
Note: Unless otherwise specified, product data for normal
refrigerants, i.e. HFC and HCFC, are applicable to
refrigeration applications. The manufacturer must be
specifically consulted before the heat exchanger is used
for flammable, toxic or dangerous liquids (e.g. hydrocar-
bons). The use must follow the relevant safety rules for
handling such liquids. For further information, please refer
to the Internet site of the supplier.
Installation
The installation must be provided with equipment that
protects the heat exchanger against pressures and
temperatures outside the approved minimum and maximum
values shown on the nameplate.
For best possible heat transfer performance, the heat
exchanger should be connected so that the media flow
through the heat exchanger in opposite directions (in
counter-flow). Take into account the risk of fire during the
installation work, i.e. bear in mind the distance to
flammable substances.
For refrigeration applications – Figure A1 shows the
installation of an evaporator, for which the connections
may be either on the front or on the rear. Figure B1 shows
a condenser.
Figure C1 shows a double-circuit unit having one water
circuit and two independent refrigerant circuits. Unless
otherwise specified, the refrigerant circuits have diagonal
flow. Connect the refrigerant to the side with the brazed
connections (or Rotalock), with the inlet at the bottom for
an evaporator. The expansion valve should be located at
least 150-200 mm from the connection at S3. Pipe elbows
between the expansion valve and the connection should
be avoided. Order the heat exchanger with the connection
position for the liquid (water) side that is best suited for
the installation, i.e. (S1, S2) or (T1, T2).
Mounting
In a rigid pipe system, small heat exchangers (weighing 1-
6 kg) can be suspended directly in the pipe-work (Figure
A2). Larger heat exchangers should be secured with
support mountings (Figure D2) intended for a specific heat
exchanger (accessory), or be secured with straps (Figure
C2) or by means of mounting bolts (Figure B2). To special
order, mounting bolts can be welded to the front or rear.
The tightening torque for M8 bolts is 10-12 Nm, and for
M10 bolts 22-25 Nm.
If there is risk of vibrations, use anti-vibration mountings
as shown in Figure A2. Heat exchangers with refrigerant
distributors should be mounted with the distributor at the
bottom. Feet and lifting lugs are available for larger units.
These components should be mounted as shown in Figure
D 2 .
N.B. The pipe-work should be well anchored and must not
apply loads to the heat exchanger connections.
N.B. In evaporator applications and in applications in
which a phase change of the media occurs, the heat
exchanger should be installed vertically.
Connections (Figure 3)
Threaded connections – Use a torque wrench when
connecting the pipe and observe the specified limits.
Some models are supplied with connections type Victaulic.
Brazed connections – Clean by rubbing down and
degreasing the various surfaces. Use a brazing metal
grade that is suitable for the materials being brazed, and
use the correct brazing temperature.
Welded connections – TIG or MIG welding.
N.B. Protect the heat exchanger against overheating by
wrapping a piece of wet cloth around the connection
whenever any brazing or welding is being done. Excessive
heating could melt the internal brazing metal inside the heat
exchanger.
Risk of freezing
Bear in mind the risk of freezing at low temperatures. Heat
ex-changers that are not in operation should be emptied
and blown dry whenever there is risk of freezing.
N.B. To avoid damage due to freezing, the medium used
must include an anti-freeze agent at operating conditions
below its freezing point.
N.B. Use a filter as protection against the possible
occurrence of foreign particles. If you have any doubt
concerning the maximum particle size, consult your
nearest representative of the supplier or look under
Product information at the supplier's Internet site.
N.B. When used as an evaporator (Figure 4)
– Use an anti-freeze thermostat and flow monitor to
ensure a constant water flow before, during and after
the compressor has been running.
– Avoid "pump-down", i.e. emptying the evaporator by
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