York YST Operation Manual page 30

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Condenser liquid pump (open / Closed)
Displays the status of the contact on the I/O board used
to control the Condenser Liquid Pump Motor Starter.
refrigerant level position
Displays the present position of the subcooler refriger-
ant level if this function is enabled.
refrigerant level Setpoint
Displays the setpoint to which the subcooler refriger-
ant level is being controlled.
pull down Time remaining
Displays the time remaining in the period in which the
Subcooler Refrigerant Level Controller is inactive af-
ter startup with the level control valve output signal
held at 100% to keep the valve fully open. This is only
displayed after the ramp up to rated speed has been
completed, the TDSP17-Turbine Stabilization Delay
shown on the Time Setpoints Screen has elapsed, and
the pull down time remaining value is not zero.
Subcooler Control Zone
Displays the current operation of the Enhanced Zone
Level Control. Service Technicians refer to YORK
Service Manual 160.67-M3 for additional information
on the operation of this control.
Subcooler Zone Time remaining
This is only displayed when the chiller is runnning
after the stablization and pull-down delays when the
zone control is active and transitioning from Zone 2 to
Zone 1 control. It displays the seconds remaining in the
time delay established by the Subcooler Zone Transi-
tion Time setpoint on the Capacity Controls Setpoints
Screen 2.
30
level Control output
Displays the present control signal being sent to the
analog output controlling the Subcooler Level Control
Valve. As the refrigerant level in the subcooler rises
above the setpoint, this output increases to open the
valve.
prograMMable
High Pressure Warning Threshold
Access Level Required: SERVICE
This value allows the user to define the condenser pres-
sure at which the chiller will initiate a warning.
drop leg (enabled / disabled)
Access Level Required: SERVICE
When a Drop Leg Refrigerant Sensor has been installed
it must be enabled via this toggle before the system
will utilize the new, enhanced resolution input.
navigaTion
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
FORM 160.67-O1
ISSUE DATE: 4/1/2015
JOHNSON CONTROLS