18 AGL_HP_VS_YHV2P_E_Rev0
Observing that suction pressure drops and discharge pressure rises when the compressor is
energized allows verification of proper rotation direction. There is no negative impact on durability
caused by operating variable speed scroll
compressors in the reversed direction for a short period of
time (maximum one hour) but oil may be lost. Oil loss can be prevented during reverse rotation if the
tubing is routed at least 15 cm above the compressor. In case of reverse rotation, the operator will
notice a lack of cooling or heating. If allowed to repeatedly restart and run in reverse without
correcting the situation, the compressor will be permanently damaged.
All variable speed scroll compressors are identically wired as shown in Figure 17. Therefore, once
the correct phasing is determined for a specific system or installation, connecting properly-phased
power leads to the identified compressor terminals will ensure proper rotation direction.
Figure 17: Terminal box and correct electrical installation
NOTE: For recommendations about cable dimensions please refer to the ED3 User Manual
(June 2019 version).
Figure 18: Electrical connections for compressor terminal and terminal cover
When installing YHV*2P compressors in a system, the following measures must be taken:
▪ Add the foam gasket and the plastic terminal cover.
▪ To connect the power leads, use suitable 90° insulated female crimp connector terminals from
"250 series" suitable for 6.35 mm (0.250 inch) male tab width.
▪ To ensure the wires are properly terminated, the correct terminal and clamping tool for the
selected wire size shall be used.
▪ The ground wiring must conform to local regulations and codes of practice (only the provided
parts must be used).
▪ The grounding screw must be torqued to 2.4 to 2.6 Nm.
▪ Add a cable strain-relief device.
▪ Protect cable and wires against sharp edges.
NOTE: The wiring should remain physically separated to minimize the introduction of
electrical noise.
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