Fig. 11 - Hot Gas Bypass Screen - York YT Millennium Operating & Maintenance

OptiView Control Center OptiView Control Center
FIG. 11
OVERVIEW
This screen displays a cutaway view of the Hot Gas Bypass
Valve. All setpoints relating to Hot Gas Bypass control are
maintained on this screen. Also, related Hot Gas Bypass
control parameters are displayed for reference. Through
animation, the relative valve position is displayed. In ad-
dition, the valve can be manually operated.
Requires access level of SERVICE.
DISPLAY ONLY
Valve Position
Displays the position of the Hot Gas valve over the range
of 0% (closed) to 100% (fully open). The valve position
is animated. When the actual position is 0% to 19%,
the valve is shown fully closed. When actual position
is 20% to 39% the valve is shown 25% open. When
actual position is 40% to 59%, the valve is shown 50%
open. When actual position is 60% to 79%, the valve is
shown as 75% open. Positions greater than 79% shown
as full open.
30
HOT GAS BYPASS SCREEN
Pre-rotation Vanes Position
Displays the position of the Pre-Rotation Vanes over the
range of 0% (closed) to 100% (fully open). Displayed
at XXX until calibration procedure is performed by
service technician.
Delta P/P
A parameter that represents system differential or
"Head". It is calculated as [(condenser pressure – evapo-
rator pressure) / evaporator pressure].
Temperature Differential
The difference between the Leaving Chilled Liquid Tem-
perature and the Leaving Chilled Liquid Temperature
Setpoint. It is calculated by subtracting the Leaving
Chilled Liquid temperature from the Leaving Chilled
Liquid Temperature Setpoint.
Total Surge Count
This is the total number of surge events that have been
detected over the lifetime of the chiller. These are the
surge events detected by the Surge Protection feature.
The surge events detected by the compressor Variable
Speed Drive Adaptive Capacity Control Board are not
included in this total.
Surge Detected (LED)
Illuminated for 5 seconds each time a surge is detected
by the Surge Protection feature. It does not illuminate
FORM 160.55-O1 (920)
00476VIP
YORK INTERNATIONAL