Figure 14 - Variable Geometry Diffuser Screen - York YMC2 Operation And Maintenance

FORM 160.84-OM1
ISSUE DATE: 9/21/2017
VARIABLE GEOMETRY DIFFUSER SCREEN

FIGURE 14 - VARIABLE GEOMETRY DIFFUSER SCREEN

OVERVIEW
This screen displays information pertinent to the VGD
operation.
DISPLAY ONLY
Active Stall Voltage
Displays the Stall Detector output voltage (x.xxVdc),
as received by the Microboard, from the stall board.
Active Stall Voltage Type
Displays STANDARD or ENHANCED to indicate
whether the Active Stall Voltage has enhanced filtering
applied when necessary to normalize flow noise.
Mach Number
Displays the compressor calculated mach number,
based on drive speed and suction conditions.
VGD 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 a qualified
Service technician.
JOHNSON CONTROLS
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
VGD Command
Displays the position command from the control to
the VGD.
Surge Detected (LED)
Illuminates for 5 seconds each time a surge is detected.
Discharge Pressure
Displays the compressor discharge pressure as sensed
by the transducer used for the stall signal determina-
tion.
Condenser Pressure
Displays the condenser pressure sensed by the con-
denser shell transducer.
Head Pressure
Displays the resultant of the Condenser Pressure minus
the evaporator pressure.
NAVIGATION
Home
Causes an instant return to the Home Screen.
Compressor
Causes an instant return to the Compressor Screen.
LD17928a
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