Surge Protection Screen (Single-Compressor Operation) - York YD Mod D Operation Manual

Surge protection screen (single-compressor operation)

Figure 19: Surge protection screen (single-compressor operation)
This screen displays the single-compressor surge protection parameters. The setpoints applicable
to this feature are maintained here. An LED illuminates when a surge event is detected during
single-compressor operation.
Note: This screen and all parameters displayed here apply to single-compressor operation
only.
Table 42: Display only fields
Field/LED name
Delta P/P
Surge window time
Surge window count
Total surge count
Surge detected (LED)
Extended run time remaining
Model YD Mod D with OptiView Control Center
Description
Displays the parameter that represents the system differential or "Head pressure". It
is calculated as (condenser pressure – evaporator pressure) / evaporator pressure.
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.
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.
Displays the total number of surge events detected over the lifetime of the unit (up to
a maximum of 65535).
Lights for 5 seconds each time a surge is detected.
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.
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