Issue:
How many starts per hour do we allow?
Resolution:
RTAC - Each compressor has a 5 minute start-to-start timer which prevents compressors from starting sooner. This equates to 12 times per hour, however because of EXV positioning and other timers the maximum number of starts a compressor could do would be about 10-11 per hour.
X-line starter: 10-11 times per hour would be maximum. However, there may be excessive wear on starter components.
Y-delta starter: the starter manufacturer recommends no more than 4 times per hour. The transition resistors need to have time for heat to dissipate.
If the chiller/compressors are starting more than this, system/application issues should be investigated.
Notes:
See Compressor Cycling for discussion on short loop applications.
Changes:
Other Question/Problem/Cause Statements:
- How many starts per hour do we allow?
Facts:
- Air-Cooled Chiller (Pueblo) (RTAC)
Document Identifier: DOC-85016
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