Surge protection screen
Figure 20: Surge protection screen
This screen displays a cutaway view of the chiller compressor and all parameters relating to the
Surge Protection feature. All setpoints relating to this screen are maintained on this screen.
The Surge Protection feature detects surge events and provides a running count of the surges
detected over the lifetime of the chiller. It allows the user to define how many surges are excessive
and how the control will react to an excess surge condition. When excess surging is detected, it
can be configured to shutdown the chiller, or initiate a surge avoidance mode while allowing it to
continue to run or simply display a warning message. The sensitivity of this surge detection is set
by the Sensitivity Setpoint on this screen. The surges detected by this feature are also used for the
Hot Gas Bypass feature (Refer to Hot gas bypass screen).
The detection and counting of surges in this feature is completely independent of the surge
detection/counting performed by the Variable Speed Drive (VSD) Adaptive Capacity Control (ACC)
Surge Detection. The ACC Surge Detection creates a surge map used to control the speed of the
drive. The ACC Surge Detection is performed in the Microboard
Table 47: Display only
Field/LED name Description
Delta P/P
A parameter that represents the system differential or Head
Pressure. It is calculated as (condenser pressure – evaporator
pressure) / evaporator pressure.
Surge Avoidance Surge
Detected (LED)
Illuminates momentarily when a surge is detected by the Surge
Protection feature. If equipped with a VSD or MVVSD these are
only the surges detected while the drive is running at maximum
frequency.
Surge Avoidance Surge
Count
This is the total number of surges accumulated by the Surge
Protection feature. If equipped with a VSD or MVVSD, it is only the
surges detected while the drive is running at maximum frequency.
YK-EP Style B Centrifugal Chiller60
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