Manual code 75803707A.0708
Page 24 of 64
4.7.6 ROUTING OF THE REFRIGERANT CIRCUIT PIPES
Correct routing of the refrigerant circuit pipes is essential to the successful operation of the air conditioner. It is
necessary to take special care in the selection and positioning of the compressor discharge and suction pipes, above all
when these lines are relatively long and in particular:
• Horizontal sections of discharge pipes between the inside and outside components must have a gradient of at
least 2% in the direction of refrigerant flow.
• If the discharge pipe has to rise above 3 m, a siphon with the minimum radius bend possible must be installed
immediately before each rising section.
• Additional siphons must be provided every 3 m of rising pipe.
• Position a counter-siphon near the condenser union. The counter-siphon must be at least as high as the
highest part of the condenser coil;
• All pipes must be secured with brackets every 2 metres. The pipe supports should prevent transmission of
vibration and at the same time allow for normal expansion and contraction of the pipes due to temperature
changes in operation.
• A 1/4" service valve must be installed on both pipes, as near as possible to the outside unit, to allow draining
and charging of the circuit.
• The refrigerant inlet and outlet unions on the air-cooled condenser can be identified by their adhesive labels.
In any case, note that the exchange of heat between the air and the refrigerant should occur in the opposite
direction to flow. This means that the condenser inlet union for the gaseous refrigerant is the union furthest
from the air inlet into the coil, i.e. the union nearest the fans. Likewise, the condenser outlet union for the
liquid refrigerant is the union furthest away from the fans.
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