Surge Protection Screen; Figure 20 - Surge Protection Screen - York YK Series Operation Manuals

FORM 160.54-O1
ISSUE DATE: 9/10/2014

FIGURE 20 - 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 63).
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
Surge Detection creates a surge map used to control
the speed of the drive. If equipped with an ACC Board
(new production chillers prior to March 2007), the ACC
JOHNSON CONTROLS

SURGE PROTECTION SCREEN

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Surge Detection is performed there. If not equipped with
an ACC Board, (new production chillers after March
2007), the ACC Surge Detection is performed in the
Microboard (Refer to OptiView Control Center – Ser-
vice Instructions (Form 160.54-M1)). With all Medium
Voltage Variable Speed Drives (MV VSD), the ACC
Surge Detection is performed in the Microboard.
Screen shown above as it appears in software version
C.OPT.01.19.307 (and later). The parameters displayed
on this screen vary according to the software version
and the motor starter type as noted below.
DISPLAY ONLY
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 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
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