MovinCool Office Pro 63 Service Manual - Manual (Page 17)

Operation Section
17
5.2 Compressor
• The compressor used for the unit is hermetically sealed. The compressor and the compressor
motor are in one casing.
(1) Compressor theory of operation
• The scroll utilizes an involuted spiral which, when matched with a mating scroll form, generates
a series of crescent-shaped gas pockets between the two members. During compression, one
scroll remains stationary (fixed scroll) while the other form (orbiting scroll) is allowed to orbit (but
not rotate) around the first form. As this motion occurs, the pockets between the two forms are
slowly pushed to the center of the two scrolls while simultaneously being reduced in volume.
When the pocket reaches the center of the scroll form, the gas, which is now at a high pressure,
is discharged out of a port located at the center. During compression, several pockets are being
compressed simultaneously, resulting in a very smooth process. Both the suction process (outer
portion of the scroll members) and the discharge process (inner portion) are continuous.
(2) Compressor operation
1) Compression in the scroll is created by the interaction of an orbiting spiral and a stationary spiral.
Gas enters the outer openings as one of the spirals orbits.
2) The open passages are sealed off as gas is drawn into the spiral.
3) As the spiral continues to orbit, the gas is compressed into two increasingly smaller pockets.
4) By the time the gas arrives at the center port, discharge pressure has been reached.
5) Actually, during operation, all six gas passages are in various stages of compression at all times,
resulting in nearly continuous suction and discharge.
< NOTE >
When the compressor shuts off, the compressor motor may run backward for a moment or two
until internal pressures is equalized. This has no effect on compressor durability but may cause
an unexpected sound after the compressor is turned off and should not be diagnosed as a
malfunction.
I001767
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