York YST, Operation Manual

Page: 106 / 164

JOHNSON CONTROLS
106
FORM 160.67-O1
ISSUE DATE: 4/1/2015
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
TiMe SeTpoinTS SCreen
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figure 41 - TiMe 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 various time
delays pertinent to the operation of the chiller and the
optional equipment supplied. It is also a gateway to
screens for programming pressures, speeds, and ramp
rates pertinent to the operation of the chiller. To view
the results of a setpoint change, the applicable Screen
name is also referenced. All setpoints require a login
access level of Service or higher.
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TdSp2 – Turbine nozzle Solenoid #1 delay
Screen: Steam System
Range: 0-3600 Sec Default: 300 Sec
This is only used when the turbine is supplied with
pneumatically actuated nozzle valves and MSSP16-
Turbine Load Solenoids is set for Enabled. When the
chiller is running at or above the SSP2-Minimum Rated
Speed, if the turbine first stage steam pressure has
been continuously above the PSP13- Turbine Nozzle
Solenoid #1 Activate pressure for this delay, Turbine
Nozzle Solenoid #1 Air Dump Solenoid is energized.
TdSp3 – Turbine nozzle Solenoid #2 delay
Screen: Steam System
Range: 0-3600 Sec Default: 100 Sec
This is only used when the turbine is supplied with
pneumatically actuated nozzle valves and MSSP16-
Turbine Load Solenoids is set for Enabled. When the
chiller is running at or above the SSP2-Minimum Rat-
ed Speed, if the turbine first stage steam pressure has
been continuously above the PSP14- Turbine Nozzle
Solenoid #2 Activate pressure for this delay, Turbine
Nozzle Solenoid #2 Air Dump Solenoid is energized.
TdSp4 – Chilled liquid pump Turn-on delay
Screen: Evaporator
Range: 0-10 Sec Default: 5 Sec
The Chilled Liquid Pump Start Contact is closed as
soon as the ramp-to-rated speed is initiated after the
slow roll warm up of the turbine. However, anytime the
speed remains above the SSP5-Chilled Liquid Pump
Turn-On Speed continuously for this delay, the Chilled
Liquid Pump Start Contact is closed. In some plants
where there is not a dedicated chilled liquid pump for
each chiller, this contact may be used to initiate the
opening of a valve in the chilled liquid inlet line. In
any case, a minimum chilled liquid flow must be estab-
lished within the TDSP5- Chilled Liquid Flow Switch
Check Delay in order to avoid a shutdown.