York YST - Alarm;Shutdown Setpoints Screen; Figure 35 - Alarm;Shutdown Setpoints Screen

JOHNSON CONTROLS
92
FORM 160.67-O1
ISSUE DATE: 4/1/2015
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
ALARM/SHUTDOWN SETPOINTS SCREEN
LD09271
FIGURE 35 - ALARM/SHUTDOWN SETPOINTS SCREEN
NOTE: OptiView
™
Control Center Screens shown may NOT represent the exact screens according to the software version utilized.
OVERVIEW
This screen allows programming of the actuation points
for various Alarm and Shutdown conditions primarily
associated with the protection of the turbine and steam
condenser. If an Alarm Setpoint is exceeded, a Warn-
ing Message will be displayed. If a Shutdown Setpoint
is exceeded, the chiller will be shutdown immediately
and a Safety Shutdown Message will be displayed. In
either case the Audible Alarm on the Power Panel is
sounded and the Anticipatory Alarm/Safety Shutdown
contacts on the YORK I/O Board are closed. In order
to better understand how these setpoints are used in the
logic, references are made to the applicable page num-
ber of YORK YST Logic Diagram 160.67-M3 where
the setpoint has visibility. To view the graphics asso-
ciated with the setpoint, the applicable Screen name
is also referenced. All setpoints require a login access
level of Service or higher.
PROGRAMMABLE
HLSP2 – Hotwell High Level Shutdown
Screen: Condensate
Range: 80-100 % Default: 90 %
An immediate shutdown is initiated if the Hotwell
Level Transmitter input signal remains continuously
above this setpoint for the TDSP13-Hotwell High
Level Timeout delay shown on the Time Delay Alarm/
Shutdown Setpoints Screen.
PSP7 - Turbine Exhaust Steam High Pressure
Shutdown
Screen: Steam System
Range: 2.5-7.5 PSIA Default: 3.5 PSIA
An immediate shutdown is initiated if the input signal
from the Turbine Exhaust Steam Pressure Transmitter
remains continuously above this setpoint for the
TDSP7-Turbine Exhaust High Pressure Timeout delay
shown on the Time Delay Alarm/Shutdown Setpoints
Screen. This check is bypassed until the chiller is in the
"System Run" mode.
PSP8 - Turbine Supply Oil Low Pressure
Shutdown
Screen: Turbine
Range: 6.0-10.0 PSIG Default: 6.0 PSIG