York YD Mod D, Operation Manual, Page: 43 / 160

Table 18: Display only fields
Field/LED name Description
Oil pump drive command frequency Indicates the VSOP Drive Command Frequency, 0 Hz to 60 Hz.
Vane motor switch (LED) (open/
closed)
Lights when the compressor vanes are in the fully closed position. When Off, indicates
open.
Compressor status
Displays whether compressor has been selected as the lead or Lag compressor. The
lead compressor is selected upon receipt of a start signal. The compressor that has the
least amount of run time that is ready to run is selected as the lead compressor.
% Full load amps
Displays compressor motor current as a percentage of Full Load Amps of the
compressor motor.
PRV opening (LED) Lights when an open command is being applied to the Pre-Rotation Vanes.
PRV closing (LED) Lights when an close command is being applied to the Pre-Rotation Vanes.
PRV position Displays the position (0% to 100%) of the pre-rotation vanes.
PRV command Displays the position command (0% to 100%) for the pre-rotation vanes.
Discharge valve close command
(LED)
Lights when a close command is being applied to the compressor Discharge Valve.
Discharge valve open command
(LED)
Lights when an open command is being applied to the compressor Discharge Valve.
Discharge valve
Indicates the status of the compressor Discharge Valve as closing, closed, opening or
opened.
High pressure switch Indicates the status of the compressor High Pressure Switch (open or closed).
Programmable
Software does not allow manual Pre-rotation Vanes control on a shutdown compressor while the
other compressor is running. This helps minimize rotation of this compressor if its Discharge Valve
is not fully sealed.
Table 19: Programmable
Button Description
Discharge valve control mode
(manual/auto)
Only displayed if the compressor is stopped. This key puts the compressor Discharge
Valve in manual or automatic operation. When in manual operation, this key is used to
manually open or close the valve.
Table 20: Navigation
Button Description
Home Returns to the Home screen.
Compressor Return to the Main Compressor screen.
VGD Only displayed if VGD feature enabled on Operations Screen. Displays the subscreen
for viewing and programming of the Variable Geometry Diffuser (VGD) feature for the
compressor.
Proximity probe calibrate Only available if chiller is stopped. Displays the subscreen that allows calibration of the
High Speed Thrust Bearing Proximity Probe for the compressor.
PRV calibrate Only available if the chiller is stopped. Displays the subscreen that allows calibration
and manual control of the Pre-rotation Vanes for the compressor.
Capacity control Displays the Capacity Control screen.
43 Model YD Mod D with OptiView Control Center