Trane CenTraVac Duplex CDHF Operation & Maintenance Manual page 19

CDHF-SVU01C-EN
General
Information
Sequencing - Balanced Starts and
Hours
When desired to balance the wear
between the compressors. This
method will extend the time between
maintenance on the lead compressor.
When balanced starts and hours is
selected, the compressor with the
fewest starts will start. If that
compressor is unavailable to start
due to a circuit lockout (including
Figure 14. CDHF/G sequence of operation: equalize starts and hours
restart inhibit) or a circuit diagnostic,
then the other compressor will be
started. The second compressor will
stage on when chiller capacity
exceeds the Stage on Load point for
30 seconds. When chiller capacity
falls below Stage off Load point for
30 seconds, the compressor with the
most hours will be shut off.
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