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COMPONENTS WITH SPECIAL FEATURES:
SCROLL COMPRESSOR:
Units equipped with scroll compressors do not have crankcase heaters and do not require hard start kits.
However, they do have a 3 minute anti-short cycle timer.
On three phase compressor, incorrect phase sequence will result in the compressor running backwards.
CAUTION:
Never use the scroll compressor to pump itself down (create a vacuum) by closingoff the suction line. The
high vacuum caused by the unit pumping down could cause severe intemal fusite arcing resulting in a
compressor failure.
Damage resultingfrom intemal fusite arcing due to extremely low pressureis apparent when an "in-warranty"
compressor isdisassembled and will result in denial of warranty claims, by the compressor manufacturer.
ANTI-SHORT CYCLE TIMER:
Two different types of anti-short cycle timers may be used for compressor protection. They are
described as follows:
°
°
Model TA24A3 manufactured by SSAC.
FUNCTION - No delay on initialstart up; but a momentary power failure will initiate a 3 minute
delay before the compressor contactor can be re-energized. Also, a brownout
control feature will prevent compressor start-up due to low line voltage.
Anti-short cycle timer is inherent in the electronic controls of the defrost control board. The
operation is similar to the above control -- no delay on initial start up; but a
momentary power failure will initiate a 3 minute delay before the compressor
contactor can be re-energized.
V. START-UP/CHECK-OUT PROCEDURES
PREUMINARY START-UP
1. If power to unit has been disconnected for any extended period of time, restore power twelve (12)
hours prior to start-up procedure.
COOUNG CYCLE CHECK-OUT
1. With thermostat calling for cooling and set 10 ° below room temperature, engage disconnect
switch(es) to start system.
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