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SECTION 2 – OPTIVIEW CONTROL CENTER
FIGURE 18 - SURGE PROTECTION SCREEN (SINGLE COMPRESSOR OPERATION)
This screen displays the single-compressor surge pro-
tection parameters. The setpoints applicable to this
feature are maintained here. An LED illuminates when
a surge event is detected during single-compressor op-
eration.
This screen and all parameters dis-
played here apply to single-compressor
operation only.
DISPLAY ONLY
Delta P/P
A parameter that represents the system differential or
"Head pressure". It is calculated as (condenser pres-
sure – 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 min-
utes, the number of surge events in the oldest minute is
60
SURGE PROTECTION SCREEN
(SINGLE-COMPRESSOR OPERATION)
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 oc-
curred 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.
Total Surge Count
Displays the total number of surge events detected over
the lifetime of the unit (up to a maximum of 65535).
Surge Detected (LED)
Illuminates for 5 seconds each time a surge is detected.
FORM 160.79-O3
ISSUE DATE: 11/09/2018
LD27857
JOHNSON CONTROLS
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