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FORM 160.87-OM1
ISSUE DATE: 8/24/2018
FIGURE 19 - SURGE PROTECTION SCREEN
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, or initiate a surge avoidance mode while
allowing it to continue to run or simply display a warn-
ing message. The sensitivity of this surge detection
is set by the Sensitivity Setpoint on this screen. The
surges detected by this feature are also used for the Hot
Gas Bypass feature (Refer to Hot Gas Bypass Screen
on Page 51).
The detection and counting of surges in this feature is
completely independent of the surge detection/counting
performed by the Variable Speed Drive (VSD) Adaptive
Capacity Control (ACC) Surge Detection. The ACC
JOHNSON CONTROLS
SURGE PROTECTION SCREEN
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Surge Detection creates a surge map used to control the
speed of the drive. The ACC Surge Detection is per-
formed in the Microboard
DISPLAY ONLY
Delta P/P
A parameter that represents the system differential or
Head Pressure. It is calculated as
(condenser pressure – evaporator pressure) / evapora-
tor pressure.
Surge Window Time
When the chiller enters run mode, this value counts
up to the time programmed as the Count Window Set-
point. When it reaches the Count Window minutes, the
number of surge events in the oldest minute is discard-
ed 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.
LD22059
53
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