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PRGD-SVX01F-EN
Figure 9. Non-condensable pump-out cycle, large quantity of air
Figure 10. Non-condensable pump-out cycle, small quantity of air
Establishing a Daily Pump-out
Limit
The average pump-out time for a CenTraVac™ chiller
purge system is approximately 7 minutes per day for a
one-week period. This value, however, varies widely
depending on chiller size, operating conditions, and
operating schedule.
Carefully monitor the purge pump-out activity for each
chiller for an appropriate period of time (one week or
more) in order to establish a baseline value for a Purge
Daily Pumpout Limit that is appropriate for that specific
installation. Set the Purge Daily Pumpout Limit high
enough to avoid nuisance trips, but low enough to
trigger an alarm diagnostic, should the pump-out rate
suddenly increase. Carefully review
“Troubleshooting,” p. 28 and the chiller purge history
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