Hot Gas Bypass Screen; Figure 20 - Hot Gas Bypass Screen - York YK Style H Operation Manual

FORM 160.76-O2
issue date: 6/15/2015

FIGURE 20 - HOT GAS BYPASS SCREEN

OVERVIEW
This screen displays a cutaway view of the Hot Gas By-
pass 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 this screen.
Through animation, the relative valve position is dis-
played. The parameters displayed on this screen vary ac-
cording to the software version and the selection made
for the Motor Communications Protocol Setpoint when
equipped with Variable Speed Drive (VSD) or Medium
Voltage Variable Speed Drive (MV VSD).
DISPLAY ONLY
HGBP Command
Displays the present position of the Hot Gas Valve as a
value between 0% (closed) to 100% (full open). By an-
imation, the valve is shown in its relative position. 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 the actual position is 40% to 59%, the
valve is shown 50% open. when actual is 60% to 79%,
the valve is shown as 75% open. Positions greater than
79% are shown as full open.
JOHNSON CONTROLS

HOT GAS BYPASS SCREEN

PRV Position
Displays the present Pre-rotation Vanes position as a
value between 0% (closed) and 100% (full open).
Delta P/P
Displays the chiller head pressure calculated as (condens-
er pressure – evaporator pressure/evaporator pressure).
Temperature Differential (LCHLT – Setpoint)
Displays the difference between the Leaving Chilled
Liquid Temperature and the Leaving Chilled Liquid
Temperature Setpoint.
Surge Avoidance Surge Count
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.
Surge Avoidance Surge Detected (LED)
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 running at maximum frequency.
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
LD19454
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