Techno Block LB 1 Notice De Mode D'emploi Et D'entretien page 22

LB 6
LB 7
LB 8-9
C) Refrigerating connection: to execute this connection, you have to use the pipes
provided with the units or those suggested in the relative table. Usually the pipe
installation is executed first of all positioning them and then connecting the unions
provided. See table 2
D) During the positioning of the suction pipe, remember that it has to lean lightly
towards the compressor. In case there are rising tracts,it is necessary to make one or
more syphons before the vertical tract in order to make the return of the oil to the
compressor easy; it is very important that the syphons have not too marked
curvatures or sinks, specially when the section of the pipe is very large. As regards
the liquid delivery pipe you have not to follow particular rules except for the beauty
and the functionality; for this reason this pipe is normally put beside the suction pipe,
certainly without making any syphons. Both pipes have to be fixed to the wall near
the bends and on the straight tracts every 1,5 - 2 metres. When the pipe positioning
has been finished, the unions have to be joined. During this operation make sure that
the connecting pipe is perfectly perpendicular to the surface on which the fixed union
is fastened; in any case before tightening firmly the union, make sure that the screw
thread has entered correctly. In case the union is a flange to be welded, remove the
movable part of the union and then weld it with the pipe. Fix the two union parts
again by interposing the gasket. When the pipe connection has been finished, you
have to create the vacuum in them and in the evaporator (the compressor-
condenser- liquid receiver group is already under gas pressure); after having done
this, the outlet shut-off valves of the liquid receiver and the suction shut-off valves of
the compressor can be turned on, putting in this way the whole system under
pressure. When the unit has been already set in motion, control if it would be
necessary to fill up the system with gas or oil.
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