current input to the drive. Current input to the drive can
be compared to the published values of MCC and RLA.
Compressor Replacement After a Motor Burn
In the case of a motor burn, the majority of
contaminated oil will be removed with the compressor.
The rest of the oil is cleaned with the use of suction
and liquid line filter driers. A 100% activated alumina
suction filter drier is recommended but must be
removed after 72 hours. See AE24-1105 for clean up
procedures and AE11-1297 for liquid line filter-drier
recommendations. NOTICE It is highly
recommended that the suction accumulator be
replaced if the system contains one. This is because
the accumulator oil return orifice or screen may be
plugged with debris or may become plugged shortly
after a compressor failure. This will result in starvation
of oil to the replacement compressor and a second
failure.
Start-Up of a New or Replacement Compressor
It is good service practice, when charging a system
with a scroll compressor, to charge liquid refrigerant
into the high side only. It is not good practice to dump
liquid refrigerant from a refrigerant cylinder into the
crankcase of a stationary compressor. If additional
charge is required, charge liquid into the low side of the
system with the compressor operating. CAUTION Do
not start the compressor while the system is in a
deep vacuum. Internal arcing may occur when any
type of compressor is started in a vacuum. NOTICE
Do not operate the compressor without enough
system charge to maintain at least 55 psig (3.8
bar) suction pressure. Do not operate with a
restricted suction or liquid line. Do not operate
with the low pressure cut-out disabled. Allowing
suction pressure to drop below 55 psig (3.8 bar) for
more than a few seconds may overheat the scrolls
and cause early drive bearing damage. Never install a
system in the field and leave it unattended with no
charge, a holding charge, or with the service valves
closed without securely locking out the system. This
will prevent unauthorized personnel from accidentally
ruining the compressor by operating with no
refrigerant flow.
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