is an operator-configured function which defaults to 5° F (3° C). This value is viewed/modified
on the Servic e1 table. The compressor will restart wh en:
• in LCW CONTROL the
LEAVING CHILLED WATER
temperature is great er than the
CONTROL POINT
plus the
RECYCLE RESTART DELTA T
; or
• in ECW CONTROL, the
ENTERING CHILLED W ATER
temperature is greater th an
the
CONTROL POINT
plus the
RECYCLE RESTART DELTA T
Once these conditions are met, the compressor s hall initiate a start -up, with a normal star t-up
sequence.
An alert condition may be generated if 5 or more RECYCLE STARTUPs occur in le ss than 4
hours. This excessive recycling can reduce machine life. Compressor recycling due to
extremely low loads should be reduced. To reduce compressor recycling, use the time sch edule
to shut the machine down dur i ng low load operation or increase the machi ne load by running
the fan systems. If the hot gas bypass is installed, adjust the values to ensure that hot gas is
energized during light load conditions. I nc r ea se the
RECYCLE RESTART DELTA T
on the
Service1 table to lengt he n the time between rest arts.
The machine sho uld not be operated below design minimu m load withou t a hot gas b ypass
installed on the machi ne.