York YK Style H, Operation Manual

Page: 68 / 212

Table 50: Display only fields
Field/LED name Description
Stall Time
Displays the accumulated time the Stall Detector Board output voltage is greater than
the High Limit Setpoint while the chiller is running.
VGD Control State
Displays the current state of the VGD control. The states are: Stall Waiting, Probing,
Stall Reacting, Surge Reacting, Surge Waiting, Hot Gas Hold, Hot Gas Over­ride, Sensor
Failure Override, Extreme Stall Override, Manual Hold, Manual Open, Manual Close.
VGD Actuator Mode
Displays Manual when either the VGD Open or Close manual buttons are pressed at
Service level. Displays Auto when the Auto key is pressed to return to automatic VGD
position control.
[VGD] Open (Manual) This key puts the VGD in manual mode and sends an OPEN command to the VGD.
[VGD] Close (Manual) This key puts the VGD in manual mode and sends a CLOSE command to the VGD.
[VGD] Hold (Manual) This key puts the VGD in manual mode and sends a hold command to the VGD.
[VGD] Auto This key puts the VGD into automatic control mode.
[Pressures] Discharge Display the compressor discharge pressure.
[Pressures] Condenser Display the condenser pressure.
[Pressures] Head Display the head pressure ( cond press - evap press/ evap press ).
Table 51: Programmable
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
VGD Start
Position
Service JCI Service
Adjustable 0.0% to 100.0%; Default 0.0%
Allows the user to set the starting position to help prevent stall during
start up when extremely low loads or high head conditions are present.
Table 52: Navigation
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
Home View View Returns the user to Home Screen.
Compressor View View Returns the user to Compressor Screen.
Setpoints Service JCI Service
Navigates to the subscreen that allows programming of the Variable
Geometry Diffuser setpoints.
VGD Calibrate Service JCI Service
Navigates to the subscreen that allows calibration of the Variable
Geometry Diffuser feedback potentiometer.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center 68