Hot Gas Bypass Screen - York YD Mod D Operation Manual

Hot gas bypass screen

Figure 17: Hot gas bypass screen
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 addition, the
valve can be manually operated.
Note: Requires access level of SERVICE.
Table 36: Display only fields
Field/LED name
HGBP command
Lead PRV position
Delta P/P
Temperature differential
Total surge count
Lead VGD position
Surge detected (LED)
Model YD Mod D with OptiView Control Center
Description
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.
Displays the position of the Lead Compressor Pre-Rotation Vanes over the range of 0%
(closed) to 100% (fully open). Displayed at XXX until calibration procedure is performed
by service technician.
Displays the parameter that represents system differential or "Head". It is calculated
as [(condenser pressure – evaporator pressure) / evaporator pressure].
Displays the difference between the Leaving Chilled Liquid Temperature and the
Leaving Chilled Liquid Temperature Setpoint. It is calculated by subtracting the
Leaving Chilled Liquid temperature from the Leaving Chilled Liquid Temperature
Setpoint.
Displays the total number of surge events that have been detected over the lifetime of
the chiller.
Displays the position of the Lead Compressor VGD over the range of 0% (closed) to
100% (fully open). Displayed at XXX until calibration procedure is performed by service
technician.
Lights for 5 seconds each time a surge is detected.
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