Surge Protection Screen - York YD Mod D Operation Manual

Surge protection screen

Figure 18: Surge protection screen
This screen displays both single compressor and dual compressor surge protection parameters.
An LED lights when a surge event is detected. Impeller animation indicates when a compressor is
running. This screen also serves as a gateway to subscreens for viewing and programming of the
single compressor and dual compressor surge protection setpoints.
Table 39: Display only fields for single compressor operation
Field/LED name
Surge window time
Surge window count
Total surge count
Surge detected (LED)
Delta P/P
Model YD Mod D with OptiView Control Center
Description
When the lead compressor is started, this value counts up from 1 minute to the time
programmed as the COUNT WINDOW Setpoint. When it reaches a count equal to the
COUNT WINDOW setpoint, it doesn't increment anymore and the number of single-
compressor surge events in the oldest minute is discarded and the number of single–
compressor surge events in the most recent minute are added. This provides a rolling
count of the total single-compressor surge events that have occurred within the last
number of minutes displayed as the SURGE WINDOW TIME. This value is reset when
one or both compressors have shutdown.
Displays the number of single-compressor surge events that have occurred in the last
1 to 5 minutes (as programmed with the COUNT WINDOW setpoint). If the single-
compressor has been running for less than the COUNT WINDOW setpoint minutes,
it is the number of dual-compressor surge events that have occurred within the last
number of minutes displayed as the SURGE WINDOW TIME. The count is cleared when
the one or both compressors have shutdown.
Displays the total number of single-compressor surge events that have occurred over
the lifetime of the chiller.
Lights for 5 seconds each time a single-compressor surge event is detected.
Displays the parameter that represents the system differential or "Head Pressure". It
is calculated as (condenser pressure – evaporator pressure) / evaporator
pressure.
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