York YK Style H Operation Manual page 70

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
It illuminates momentarily when a surge is detected by
the Surge Protection feature, regardless of the VSD op-
erating speed.
ACC Surge Detected (LED)
Only displayed if equipped with a VSD or MV VSD.
Illuminates momentarily when a surge is detected by
the ACC function in the Microboard, while the drive is
running at less than maximum frequency.
Stall Count
Displays the number of times the Stall Detector Board
output voltage goes above the High Limit Setpoint.
The count can be cleared with in ADMIN access lev-
el using the VGD CYCLE COUNT key on the VGD
SETPOINTS Screen.
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 Over-
ride, 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 auto-
matic 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.
70
[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)
PROGRAMMABLE
None
NAVIGATION
Home
Access Level Required: VIEW
Returns user to HOME Screen.
Compressor
Access Level Required: VIEW
Returns user to COMPRESSOR Screen.
Setpoints
Access Level Required: SERVICE
Move to the subscreen that allows programming of the
Variable Geometry Diffuser setpoints.
VGD Calibrate
Access Level Required: SERVICE
Move to the subscreen that allows calibration of the
Variable Geometry Diffuser feedback potentiometer.
FORM 160.76-O2
issue date: 6/15/2015
JOHNsON CONtROLs