SystemAir MCV 15 Manuel D'installation page 11

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The internal refrigeration circuit of the air-conditioning units is factory prepared; the terminal
connection points are accessible from within the unit and closed with shut-off valves.
The only circuit connections required on site are those between indoor and remote (outdoor) unit.
The sizing of the pipes should be calculated keeping in mind distance and pressre drops due to curves
and oil traps, etc. An indication is found. An indication is found in Appendix III.
These refrigeration lines should be carried out keeping the following points in mind:
Use only copper piping making sure that it has been sized correctly according to the
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refrigeration capacity.
So as to avoid vibrations, pipes should not be touching each other when placed side by side.
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When a change of direction in the piping is required do this with large radius curves and not
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with sharp bends (this will notably reduce pressure drops and noise level); the radius should at
least be equal to the diameter of the pipe.
Wash out and dry the pipelines very carefully by blowing Nitrogen through them.
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If there is some uncertainty as to how well the circuit has been cleaned and dried, then it is
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advisable, on the liquid pipeline (for Conf.2) or on the gas pipeline (for Conf.3 & 4) to install a
filter-drier.
The filter used should be of the type that allows inspection and substitution of the drier
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cartridge.
This drier cartridge could require changing several times before the entire circuit is to be
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considered clean.
It is also reccomended that the last of these cartridges be left on the installation for at least 48
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hours of real operation before removing and leaving the pipeline free.
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On the pipeline a connection point should be installed so that a vacuum can be drawn before
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the valves to the indoor unit are opened since CLIMASYSTEM units are are already charged
with refrigerant gas. The type of gas is indicated on the unit.
Once the connections have been terminated and a vacuum has been drawn in the pipelines,
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these should be now charged with FREON gas (whichever type has been used in the unit),
making sure that there are no leaks in the joints and in the installation (make use of an
appropriate leak detector).
If leaks are detected, they should be repaired and checked before drawing the vacuum again in
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:$51,1* : if the condensing unit (for Conf.3 & 4) is installed in a position that is higher than the the pipelines.
indoor unit, it will be necessary to add oil-traps on the gas line in order to ensure oil returns to the
compressor (one oil-trap every 2-3 metres in height, see fig. 6).
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