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FORM 160.79-O3
ISSUE DATE: 11/09/2018
FIGURE 19 - SURGE PROTECTION SCREEN (DUAL COMPRESSOR OPERATION)
This screen displays the dual-compressor surge protec-
tion parameters. The setpoints applicable to this feature
are maintained here. An LED illuminates when a surge
event is detected during dual-compressor operation.
This screen and all parameters displayed
here apply to dual-compressor operation
only.
DISPLAY ONLY
Surge Window Time
When the lag 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 no longer
increments and the number of dual compressor surge
events in the oldest minute is discarded and the num-
ber of dual–compressor surge events in the most recent
minute are added, thus providing a rolling count of
the total dual-compressor surge events that have oc-
curred within the last number of minutes displayed as
the SURGE WINDOW TIME. This value is reset when
one or both compressors have shutdown.
JOHNSON CONTROLS
SURGE PROTECTION SCREEN
(DUAL-COMPRESSOR OPERATION)
SECTION 2 – OPTIVIEW CONTROL CENTER
Surge Window Count
Displays the number of dual-compressor surge events
that have occurred in the last 15 to 120 minutes (as
programmed with the COUNT WINDOW setpoint). If
the lag 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.
Total Surge Count
Displays the total number of dual-compressor surge
events detected over the lifetime of the chiller.
Surge Detected (LED)
Illuminates for 5 seconds each time a dual-compressor
surge is detected.
High Head Lag Start (LED)
Illuminates when a High Head Lag Start condition ex-
ists. The lag chiller is prone to surge on start when a
high head condition exists. During these conditions,
the lead compressor will be unloaded before the lag
compressor is started.
2
LD27858
63
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