McQuay WSC Operating Manual page 64

SET COMP#N SPs (1)
Demand Limit = OFF
Minimum Amps =XXX%
Maximum Amps =XXX%
Demand Limit settings can be OFF or ON as determined from the Demand Limit setpoint.
SET COMP#N SPs (2)
StageMode = NORMAL
StageSequence# =XX
Max Comprs ON = XX
StageMode settings can be NORMAL, HI EFF, PUMP, and STANDBY as determined by the Stage
Mode setpoint. NORMAL is the auto balance sequence starting compressors with least starts and
stopping with most hours, in sequence. HI EFF is used with multiple dual compressor chillers and
runs one compressor per chiller when ever possible. PUMP starts all compressors on the same
chiller first starting with the chiller with the compressor with the least starts. STANDBY is used
in multi-compressor systems and reserves a compressor to come on only if there is a failure of
another compressor in the system and the standby compressor capacity is required to maintain
chilled water temperature.
StageSequence is set for each compressor:
In NORMAL or STANDBY Mode, all compressors can have the same number or a number from 1
up to the total number of compressors. Sequence number has priority over other considerations. If
four compressors in a system are given the sequence numbers 1 through 4, they will always start in
that order. With the same number they will auto-sequence.
In HI EFF or PUMP, all compressors must have the same sequence number.
Max Comprs ON limits the number of compressors allowed to run in multi-compressor systems. It
provides a "floating standby" compressor. All compressor controllers must have the same setting
for this setpoint.
SET COMP#N SPs (3)
StageDeltaT= X.X° ° ° ° F
Stop-Start = xx min.
Start-Start =xx min.
SET COMP#N SPs (4)
Full Load = XXX sec
SET COMP#N SPs (5)
OilNoStrtDiff=XX° ° ° ° F
Abs Capacity=XXXXT
HotGasBypass = XX%
64 OM Centrif Micro ΙΙ-5