Figure 15 - Variable Geometry Diffuser (Vgd) Screen - York YZ MODEL A Operation And Maintenance Manual

FORM 161.01-OM1
ISSUE DATE: 6/8/2018

FIGURE 15 - VARIABLE GEOMETRY DIFFUSER (VGD) SCREEN

This screen displays information pertinent to the VGD
operation.
DISPLAY ONLY FIELDS
FIELD/LED NAME
Stall Detector Voltage
Mach Number
VGD Position
VGD Command
Surge Detected (LED)
Discharge Pressure
Condenser Pressure
Head Pressure
NAVIGATION
BUTTON
Home
Compressor
JOHNSON CONTROLS
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
DISPLAY ONLY FIELDS
Displays the Stall Detector output voltage (x.xxVdc), as received by the
Microboard, from the stall board.
Displays the compressor calculated mach number, based on drive speed and
suction conditions.
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 a
qualified Service technician.
Displays the position command from the control to the VGD.
Illuminates for 5 seconds each time a surge is detected.
Displays the compressor discharge pressure as sensed by the transducer used
for the stall signal determination.
Displays the condenser pressure sensed by the condenser shell transducer.
Displays the resultant of the Condenser Pressure minus the evaporator pres-
sure.
NAVIGATION
Causes an instant return to the Home Screen.
Causes an instant return to the Compressor Screen.
LD26737
DESCRIPTION
DESCRIPTION
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