Filter
Top Products
compressor is running in a lightly loaded condition. This cycling of the chiller is normal and is
known as recycle. A recycle shutdown is initiated when any of the following conditions are true:
• when in LCW control, the
LEAVING CHILLED WATER
temperature is more than 5° F
(3° C) below the control point, and the
CONTROL POINT
has not increased in the
last 5 minutes
• when
ECW CONTROL OPTION
is enabled, the
ENTERING CHILLED WATER
tem-
perature is more than 5° F (3° C) below the
CONTROL POINT
, and the
CONTROL
POINT
has not increased in the last 5 minutes
• when the
LEAVING CHILLED WATER
temperature is within 3° F (2° C) of the
BRINE
REFRIG TRIPPOINT.
When the machine is in RECYCLE mode, the chilled water pump relay remains energized so
that the chilled water temperature can be monitored for increasing load. The recycle control
uses
RECYCLE RESTART DELTA T
to check when the compressor should be restarted. This
is an operator-configured function which defaults to 5° F (3° C). This value is viewed/modified
on the Service1 table. The compressor will restart when:
• in LCW CONTROL the
LEAVING CHILLED WATER
temperature is greater than the
CONTROL POINT
plus the
RECYCLE RESTART DELTA T
; or
• in ECW CONTROL, the
ENTERING CHILLED WATER
temperature is greater than
the
CONTROL POINT
plus the
RECYCLE RESTART DELTA T
Once these conditions are met, the compressor shall initiate a start-up, with a normal start-up
sequence.
An alert condition may be generated if 5 or more RECYCLE STARTUPs occur in less than 4