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direction.
Verification of proper rotation is done by observing suction and discharge pressures when the compressor is
operating. A decrease in discharge pressure and an increase in suction pressure indicate reverse rotation. In
order to correct this situation, disconnect the power and switch any two power leads at the unit contactor.
NEVER switch leads directly at the compressor.
Internal wiring of the compressor is consistent with the direction of rotation. As a result, once the correct
phasing is determined for a specific system or installation, connecting properly phased leads to the same
terminals should maintain proper rotation direction.
A phase monitor can be applied to ensure correct rotation when power is initiated. Each compressor is labeled
with the appropriate sequence. As showed in wiring diagram, the line phases R (L1), S (L2) and T (L3) should
be connected to terminals U, V and W, respectively.
Figure 5-4 Compressor Terminal
4.9 Terminal cover and clip
The terminal cover and clip should be installed prior to operation of the compressor. To ensure the cover is
properly installed, a double check should be done to make sure the lead wires are not pinched under it.
For the models with IP67 terminal box, the wiring connections and installation of sealing rubber, gland kit
should follow the instructions in specification to ensure the sealing effect. An improper wire connection may
cause an improper installation of the terminal box cover, and also cause the touch and cross of power line
and ground lead.
