Hot Gas Bypass Screen; Figure 19 - Hot Gas Bypass Screen - York YD Series Operation Manual

SECTION 2 – OPTIVIEW CONTROL CENTER
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 refer-
ence. Through animation, the relative valve position is
displayed. In addition, the valve can be manually oper-
ated.
Requires access level of SERVICE. Ser-
vice Technicians refer to YORK Service
Manual 160.69-M1 for operation instruc-
tions and explanation of all program-
mable setpoints and displayed values.
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 ac-
tual 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 great-
er than 79% shown as full open.

FIGURE 19 - HOT GAS BYPASS SCREEN

60

HOT GAS BYPASS SCREEN

Lead Pre-Rotation Vanes Position
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 pro-
cedure is performed by service technician.
Delta P/P
A parameter that represents system differential or
"Head". It is calculated as [(condenser pressure –
evaporator pressure) / evaporator pressure]
Temperature Differential
The difference between the Leaving Chilled Liquid
Temperature and the Leaving Chilled Liquid Tem-
perature 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.
Surge Detected (LED)
Illuminated for 5 seconds each time a surge is detected.
FORM 160.69-O1
ISSUE DATE: 9/30/2012
LD08616
JOHNSON CONTROLS