Surge screen
Figure 18: Surge screen overview
This screen displays the chiller compressor and all parameters relating to the Surge Protection
feature. All setpoints relating to this screen are maintained on this screen.
Table 27: Display only fields
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 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.
Surge Detected (LED)
Illuminates momentarily when a surge is detected by the Surge
Protection feature.
Surge Count Total number of surges accumulated by the Surge Protection feature.
YMC
2
Mod B with OptiView
™
Control Center
54
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