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The diagram (Hg. 15) shows the "standard" installation of
a water-type heat exchanger.
4.2.2.
Direct expansion exchanger
In order to permit operation of the whole system, make
sure that the heat exchange occurs in reverse current
before)making the connections to the heat exchanger (fig.
16).
The cooling circuit must be complete with all the
necessary flow control, filtration and safety devices; the
pipe must be sized to allow proper circulation of the
compressor protection oil.
We recommend you protect the exchanger against
vibrations to prevent the likelihood of rupture at the joint
between manifolds and copper pipes.
In order to ensure correct operation of the thermal
expansion valve, the bulb of the valve must be in perfect
contact with the intake line and fitted on the outside of
the air flow so as not to be affected by it.
Special care must be taken with the SIPHONING of these
exchangers to ensure the maximum heat exchange and
correct entrainment of the oil in the circuit. The diagram
in fig. 16 shows a siphoning system without division of
head.
Fig. 17 System siphoning example with division of
cooling head.
Fig. 18 shows an incorrect siphon system (a) and a
correct one (b), in the case of installation of the
compressors at a point below the evaporator.
9
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