JOHNSON CONTROLS
47
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
3
FIGURE 14 -
SURGE PROTECTION SCREEN
LD26736
DISPLAY ONLY FIELDS
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 min-
utes, the number of surge events in the oldest minute is discarded and the num-
ber 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 occurred in the last 1 to 5 min-
utes 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 fea-
ture.
Surge Avoidance Surge Count
This is the total number of surges accumulated by the Surge Protection feature.
Surge Detection State
This is the current state of the surge detection feature.
This screen displays the chiller compressor and all pa-
rameters relating to the Surge Protection feature. All
setpoints relating to this screen are maintained on this
screen.
The Surge Protection feature allows the user to define
how many surges are excessive and how the control
will react to an excess surge condition. When excess
surging is detected, it can be configured to shutdown
the chiller.
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