JOHNSON CONTROLS
43
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
FORM 160.78-O2
ISSUE DATE: 5/22/2017
2
OVERVIEW
This screen displays a cutaway view of the chiller com-
pressor and all parameters relating to the Surge Pro-
tection feature. All setpoints relating to this screen are
maintained on this screen.
The Surge Protection feature detects surge events and
provides a running count of the surges detected over
the lifetime of the chiller. It 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. The sensitivity of this surge detection is set
by the Sensitivity Setpoint on this screen.
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
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.
Surge Detected (LED)
Illuminates momentarily when a surge is detected by
the Surge Protection feature.
Surge Count
This is the total number of surges accumulated by the
Surge Protection feature.
SURGE SCREEN
LD14853
FIGURE 17 -
SURGE SCREEN
