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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 D2.
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 con-
necting 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. Grind inside
and outside of the pipe and, if bevelled, also the bevelled
edge at least 25 mm from the pipe edge and inward. This
should be done to avoid contamination of copper in the
welded area, which might cause the weld to crack.
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. Exces-
sive heating could melt the internal brazing metal inside
the heat exchanger.
Risk of freezing
Bear in mind the risk of freezing at low tempera-
tures. Heat exchangers 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 occur-
rence of foreign particles. If you have any doubt concern-
ing the maximum particle size, consult your nearest re-
presentative of the supplier or look under Product infor-
mation 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
running the compressor after shutdown until a preset
refrigerant pressure is reached. The temperature could
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