Hydraulic Connections; Rotational Direction Of Scroll Compressors - York YLCA Technical Information

1 Technical Information
1.11 Instructions for installation and connection of the unit

1.11.3 Hydraulic connections

The hydraulic connections of the water inlet and outlet of the unit should be carried out respecting the
inlet and outlet directions indicated.
Galvanised iron or copper piping can be used, with dimensions no lower than those indicated, and keep‐
ing in mind the pressure drops at said connections and in the internal exchanger of the installation.
Pump dimensioning should be carried out in accordance with a nominal flow rate that allows an Ģt within
the operating limits.
During the winter season, with outdoor temperatures below 0 °C, take precautions to avoid freezing of
the water in the pipes.
Usually, a filling solution is applied to the circuit with an antifreeze mixture (glycol).

1.11.4 Rotational direction of Scroll compressors

The Scroll compressors only operate correctly in one direction of rotation. Although these units are pro‐
tected by a phase order detector, when the unit is started, check that the unit rotates in the correct
direction. If it is not correct:
If the compressors are not connected correctly and are rotating in the wrong direction:
• The compressor will not compress.
• Operating noise will be abnormal.
• Electricity consumption (A) will be low.
• They overheat.
The phase detector must have both LEDs lit for correct operation:
• Green LED lit means: Power ON.
• Yellow LED lit means: Relay ON.
44