Time Setpoints Screen; Figure 41 - Time Setpoints Screen - York YST Operation Manual

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
noTe: OptiView Control Center Screens shown may NOT represent the exact screens according to the software version utilized.
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figure 41 - TiMe SeTpoinTS SCreen

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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
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
106

TiMe SeTpoinTS SCreen

Default: 300 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
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.
FORM 160.67-O1
ISSUE DATE: 4/1/2015
LD09281
Default: 5 Sec
JOHNSON CONTROLS