York YZ MODEL A - FIGURE 15 - Variable Geometry Diffuser (VGD) Screen

JOHNSON CONTROLS
49
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
3
FIGURE 15 - VARIABLE GEOMETRY DIFFUSER (VGD) SCREEN
LD26737
This screen displays information pertinent to the VGD
operation.
DISPLAY ONLY FIELDS
DISPLAY ONLY FIELDS
FIELD/LED NAME DESCRIPTION
Stall Detector Voltage
Displays the Stall Detector output voltage (x.xxVdc), as received by the
Microboard, from the stall board.
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
qualied Service technician.
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 determination.
Condenser Pressure Displays the condenser pressure sensed by the condenser shell transducer.
Head Pressure
Displays the resultant of the Condenser Pressure minus the evaporator pres-
sure.
NAVIGATION
NAVIGATION
BUTTON DESCRIPTION
Home Causes an instant return to the Home Screen.
Compressor Causes an instant return to the Compressor Screen.