Hot Gas Bypass Screen - York YK Style H Operation Manual

Hot gas bypass screen

Figure 39: Hot gas bypass screen
This screen displays a cutaway view of the Hot Gas Bypass Valve. The setpoints relating to the
Hot Gas Bypass Control are maintained on this screen. Related Hot Gas control parameters are
displayed for reference. The Hot Gas Valve can be manually controlled from the Capacity Control
screen. Through animation, the relative valve position is displayed.
Table 44: Display only fields
Field/LED name
HGBP Command
PRV Position
Delta P/P
Active Delta T (LCHLT – Setpoint)
Surge Avoidance Surge Count
Surge Avoidance Surge Detected
(LED)
ACC Surge Detected (LED)
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
Description
Displays the present position of the Hot Gas Valve as a value between 0% (closed) to
100% (full open). By animation, the valve is shown in its relative position.
Actual position
0% to 19%
20% to 39%
40% to 59%
60% to 79%
> 79%
Displays the present Pre-rotation Vanes position as a value between 0% (closed) and
100% (full open).
Displays the chiller head pressure calculated as (condenser pressure – evaporator
pressure)/evaporator pressure.
Displays the difference between the Leaving Chilled Liquid Temperature and the
Leaving Chilled Liquid Temperature Setpoint.
This is the total number of surges accumulated by the Surge Protection feature.
If equipped with a VSD or MV VSD, it is only the surges detected while the drive is
running at maximum frequency.
Illuminates momentarily when a surge is detected by the Surge Protection feature. If
equipped with a VSD or MV VSD these are only the surges detected while the drive is
at maximum frequency.
Only displayed if equipped with a VSD or MV VSD. Illuminates momentarily when a
surge is detected by the ACC function in the Microboard, while the drive is at less than
maximum frequency.
Displayed valve position
Fully closed
25% open
50% open
75% open
Fully open
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