Variable Geometry Diffuser (Vgd) Setpoints Screen; Vgd 1; Figure 16 - Variable Geometry Diffuser Setpoints Screen - York YD Series Operation Manual

FORM 160.69-O1
ISSUE DATE: 9/30/2012

VARIABLE GEOMETRY DIFFUSER (VGD) SETPOINTS SCREEN

Overview
(This feature applies to Software version C.MLM.11.02.
XXX (and later) or C.OPT.11.02.300 (and later))
The Variable Geometry Diffuser setpoints for VGD 1
and 2 are maintained on this screen. All setpoints re-
quire a login access level of Service unless otherwise
noted. Service Technicians refer to YORK Service
Manual 160.69-M1 for operation and explanation of
all setpoints and displayed values.
Display Only

VGD 1

Stall Detector Voltage
Displays the Stall Detector output voltage (x.xxVdc),
as received by the Microboard.
Pre-rotation Vanes Position
Displays the position of the Pre-rotation vanes over
the range of 0% (fully closed) to 100% (fully open).
Displayed as XXX until calibration procedure is per-
formed by Service Technician.

FIGURE 16 - VARIABLE GEOMETRY DIFFUSER SETPOINTS SCREEN

JOHNSON CONTROLS
SECTION 2 – OPTIVIEW CONTROL CENTER
Variable Geometry Diffuser Position
Displays the position of the VGD over the range of 0%
(fully closed) to 100% (fully open). Displayed as XXX
until calibration procedure is performed by Service
Technician.
Diffuser Gap Close (LED)
Illuminates when a close signal is being applied to the
VGD.
Diffuser Gap Open (LED)
Illuminates when an open signal is being applied to the
VGD.
Surge Detected (LED)
Illuminates for 5 seconds each time a surge is detected.
Control Status
Displays the current state of the VGD control while the
chiller is running. The states are: Stall Waiting, Stall
Reacting, Probing, Surge Reacting, Surge Waiting, Hot
Gas Override, VGD Position Override, PRV Position
Override.
2
50041a
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