York YK-EP Operation And Maintenance Manual page 65

Table 50: Display only
Field/LED name
ACC Surge Detected (LED)
VGD Count
VGD Time ( __Days __Hrs
__Min __Sec)
Control Status
Time Remaining
Diffuser Gap Control Mode
Table 51: Programmable
Button Access level
[VGD] Open
Service
(Manual)
[VGD] Close
Service
(Manual)
[VGD] Hold
Service
(Manual)
Table 52: Navigation
Button Access Level Description
Home View
Compressor View
VGD
Service
Setpoints
YK-EP Style B Centrifugal Chiller
Description
Only displayed if equipped with a VSD or MVVSD. Illuminates
momentarily when a surge is detected by the ACC function in
the Microboard, while the drive is running at less than maximum
frequency.
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 level using the VGD CYCLE COUNT
key on the VGD SETPOINTS Screen.
Displays the accumulated time the Stall Detector Board output
voltage is greater than the High Limit Setpoint while the chiller is
running.
Displays the current state of the VGD control. The states are: Stall
Waiting, Stall Reacting, Probing, Surge Reacting, Surge Waiting, Hot
Gas Override.
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).
Indicates whether the VGD is under manual or automatic control.
Description
This key puts the VGD in manual mode and sends an OPEN
command to the VGD
This key puts the VGD in manual mode and sends a CLOSE
command to the VGD.
This key puts the VGD in manual mode and sends a HOLD command
to the VGD.
Returns user to HOME Screen.
Returns user to COMPRESSOR Screen.
Move to the subscreen that allows programming of the Variable
Geometry Diffuser setpoints
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