Table 47: Display only
Field/LED name Description
Surge Window Time
When the chiller enters run mode, this value counts up to the time
programmed as the Count Window Setpoint. When it reaches the
Count Window minutes, the number of surge events in the oldest
minute is discarded and the number of surge events in the most
recent minute is added, thus providing a rolling count of the total
surge events that have occurred in the last Count Window minutes.
This value is reset when the chiller shuts down.
Surge Window Count
Displays the number of surge events that have occurred in the last 1
to 5 minutes as programmed with the Count Window Setpoint. If the
chiller has been running for less than the Count Window minutes,
it is the number of surge events that have occurred within the last
number of minutes displayed as the Surge Window Time. The count
is cleared when the chiller shuts down.
Extended Run Time
Remaining
Displays the time remaining in the 10-minute Extended Run period.
During this period, the Pre-Rotation Vanes are driven closed
and WARNING – SURGE PROTECTION – EXCESS SURGE LIMIT is
displayed. Refer to operation under Count Limit in Table 48.
Table 48: Programmable
Button Access level Description
Count Limit Operator
Allows the user to define the maximum number of surge events
(4 to 20; default 15) that can occur within a defined period of time
before an Excess Surge situation is detected. If the Surge Window
Count exceeds the Count Limit, an Excess Surge situation has
occurred*.
Count
Window
Operator
Allows the user to define the period of time (1 to 5 minutes; default
3) in which the number of surge events (Surge Window Count) are
compared to the maximum allowed (Count Limit), for the purpose
of detecting an Excess Surge situation.
Clear Surge
Count
Admin Allows user to set the Surge Count to zero.
61YK-EP Style B Centrifugal Chiller
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