Johnson Controls YORK YVAM 0350, Operation & Maintenance Manual

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Surge screen
Figure 19: 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 26: 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. This provides 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.
Use the surge protection feature to define how many surges are excessive and how the control
reacts to an excess surge condition. When excess surging is detected, you can configure the chiller
to shut down. The sensitivity of this surge detection is set by the Sensitivity setpoint on this screen.
YVAM Control Center 46