83003702.K Operating Instruction
Type KPC 108-L-U/S
page 42
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Single-Stage Hermetic Compliant SCROLL Motor-Compressor
Type ZR xx K3E-TWD-561
Rotation Direction
Scroll compressors will only compress in one rotational direction. Three phase compressors will rotate in either direction
depending upon phasing of the power. Since there is a 50-50 chance of connecting power in such a way as to cause
rotation in the reverse direction, it is important to include notices and instructions in appropriate locations on
the equipment to ensure proper rotation direction when the system is installed and operated.
Observing that suction pressure drops and discharge pressure rises when the compressor is energized makes
verification of proper rotation direction. There is no negative impact on durability caused by operating three phase
Copeland Scroll compressors in the reversed direction for a short period of time (under 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. After several minutes of
operation in reverse, the compressor's protection system will trip due to high motor temperature. The systems operator
will notice a lack of cooling. However, if allowed to repeatedly restart and run in reverse without correcting the situation, the
compressor will be permanently damaged.
