York YST Operation Manual page 104

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
PSP9 - Turbine Auxiliary Oil Pump Off
Screen: Turbine
Range: 10.0-18.0 PSIG
This is only used when the turbine is supplied with an
auxiliary oil pump and MSSP6-Turbine Lubrication
Type is set for Pump on the Configuration Screen
1. It determines the turbine supply oil pressure at
which the auxiliary oil pump will be stopped after
the SSP7-Turbine Aux Oil Pump Activate speed has
been achieved and the turbine shaft driven oil pump is
producing sufficient pressure.
pSp10 - Turbine auxiliary oil pump on
Screen: Turbine
Range: 8.0-12.0 PSIG
This is only used when the turbine is supplied with an
auxiliary oil pump and MSSP6-Turbine Lubrication
Type is set for Pump on the Configuration Screen 1. It
determines the turbine supply oil pressure at which the
auxiliary oil pump will be restarted while the chiller is
running at or above the SSP2-Minimum Rated Speed
setpoint shown on the Speed Setpoints Screen if the
turbine shaft driven oil pump is not producing suffi-
cient pressure.
pSp12 – open ejector Steam inlet
Screen: Vacuum
Range: 0-15.0 PSIA
This is only used when the chiller is supplied with a
steam condenser that uses a single vacuum pump and
steam ejectors to maintain the required turbine exhaust
pressure and MSSP11-Vacuum Pump Mode on Con-
figuration Screen 1 is set for Ejector. For the ejectors
to operate efficiently, it is best to initially reduce the
exhaust pressure with the vacuum pump. When the
turbine exhaust pressure has decreased to this value,
the Ejector Steam Supply Valve Actuator digital out-
put is switched on (and latched on until the chiller is
shutdown) to open the ejector supply valve and allow
steam into the ejectors. After the ejectors are activated,
the turbine exhaust pressure will decrease rapidly to
the PSP5-Vacuum Pump Shutdown setpoint and the
vacuum pump will be stopped. This must be set above
the PSP5 value in order to automatically start the ejec-
tors before the vacuum pump is stopped.
104
Default: 16.0 PSIG
Default: 8.0 PSIG
Default: 5.0 PSIA
pSp13- Turbine nozzle Solenoid #1 activate
Screen: Steam System
Range: -14.7-100 PSIG
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 this value for the TDSP2-
Turbine Nozzle Solenoid #1 Delay, Turbine Nozzle
Solenoid #1 Air Dump Solenoid is energized. This
setpoint must be determined by a York Service Techni-
cian by increasing the load on the turbine (with both
hand valves closed) and observing when the first stage
pressure stops increasing even though the governor
valve output signal continues increasing. The setpoint
is 1-2 PSI below the observed pressure. Opening a noz-
zle valve allows steam to flow through more nozzles
in the turbine nozzle block and increases the turbines
potential capacity.
pSp14- Turbine nozzle Solenoid #2 activate
Screen: Steam System
Range: -14.7-100 PSIG
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 this value for the TDSP3-Turbine
Nozzle Solenoid #2 Delay, Turbine Nozzle Solenoid
#2 Air Dump Solenoid is energized to increase the
turbines potential capacity. This setpoint must be de-
termined by a York Service Technician by increasing
the load on the turbine (with Turbine Nozzle Solenoid
Valve #1 energized) and observing when the first stage
pressure stops increasing even though the governor
valve output signal continues increasing. The setpoint
is 1-2 PSI below the observed pressure.
pSp15- Turbine nozzle Solenoid deadband
Screen: Steam System
Range: 1.0-10.0 PSIG
This is only used when the turbine is supplied with
pneumatically actuated nozzle valves and MSSP16-
Turbine Load Solenoids is set for Enabled. When a
nozzle solenoid is energized, it will remain energized
until the turbine first stage pressure has decreased be-
low the activation pressure by this value.
FORM 160.67-O1
ISSUE DATE: 4/1/2015
Default: 45.0 PSIG
Default: 50.0 PSIG
Default: 5.0 PSIG
JOHNSON CONTROLS