York YK-EP B Operation & Maintenance Manual page 57

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
VGD Count
Displays the number of times the Stall Detector Board
output voltage goes above the High Limit Setpoint.
The count can be cleared with an ADMIN access lev-
el using the VGD CYCLE COUNT key on the VGD
SETPOINTS Screen.
VGD Time ( __Days __Hrs __Min __Sec)
Displays the accumulated time the Stall Detector Board
output voltage is greater than the High Limit Setpoint
while the chiller is running.
Control Status
Displays the current state of the VGD control. The
states are: Stall Waiting, Stall Reacting, Probing, Surge
Reacting, Surge Waiting, Hot Gas Override.
Time Remaining
While the VGD is in the Stall Waiting State, displays
the time remaining in the Probe Wait Time interval
(value programmed as the Probe Wait Time setpoint).
Diffuser Gap Control Mode
Indicates whether the VGD is under manual or auto-
matic control.
PROGRAMMABLE
[VGD] Open (Manual)
Access Level Required: SERVICE
This key puts the VGD in manual mode and sends an
OPEN command to the VGD.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
[VGD] Close (Manual)
Access Level Required: SERVICE
This key puts the VGD in manual mode and sends a
CLOSE command to the VGD.
[VGD] Hold (Manual)
Access Level Required: SERVICE
This key puts the VGD in manual mode and sends a
HOLD command to the VGD.
NAVIGATION
Home
Access Level Required: VIEW
Returns user to HOME Screen.
Compressor
Access Level Required: VIEW
Returns user to COMPRESSOR Screen.
VGD Setpoints
Access Level Required: SERVICE
Move to the subscreen that allows programming of the
Variable Geometry Diffuser setpoints.
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