FORM 160.72-O1 (810)
JOHNSON CONTROLS
46
CAPACITY CONTROLS SCREEN
Max Pressure Delta – Anti-Surge
Displays the maximum compressor differential pres-
sure allowed for stable operation.
Min Pressure Delta – Anti-Surge
Displays the minimum compressor differential pres-
sure allowed for stable operation.
Evaporator Pressure – Anti-Surge
Displays the refrigerant pressure in the evaporator.
Condenser Pressure – Anti-Surge
Displays the refrigerant pressure in the condenser.
Delta Pressure – Anti-Surge
Display the current head pressure defined as the Com-
pressor Discharge Pressure minus Evaporator Pressure.
Setpoint – Temperature Control
Displays the present setpoint to which the chiller is op-
erating, whether controlled locally or remotely.
Leaving Chilled Liquid Temperature –
Temperature Control
Displays the temperature of the liquid as it leaves the
evaporator.
Hot Gas Ratio Calculation
Displays the calculated hot gas valve position re-
quired.
Hot Gas Ratio Setpoint
The PRV position below which the Hot Gas valve will
begin to open if the value is greater than the Anti-Surge
value.
Hot Gas Ratio Calculation
The proportional translation of the following:
Hot Gas Ratio Setpoint or Anti-Surge value 1.
Vane Position2.
Hot Gas Temperature Setpoint
Temperature at which the Hot Gas valve will begin to open
if the leaving chilled liquid goes below this setpoint.
HGV Ramp
Displays the ramp rate for the Hot Gas Valve during
the startup of the chiller. The system status will display
CONTROLS RAMPING when this rate is in effect.
Hot Gas Bypass - Position
Displays the current Hot Gas Bypass position in a per-
centage.
Hot Gas Bypass - Mode
Displays the mode of operation of the Hot Gas Bypass
activator as either Auto or Manual.
Pre-Rotation Vanes - Position
Displays the current PRV position in a percentage
Pre-Rotation Vanes — Mode
Displays the mode of operation of the PRV actuator as
either Auto or Manual.
PROGRAMMABLE
Override Limits
Access Level Required: Service
Allows the operator to change the demand limit setpoint
between 0 % and 100 % amps for current or kilowatts
for power.
Leaving Chilled Local Setpoint
Access Level Required: Operator
Allows the operator to change the local leaving chiller
liquid setpoint.
NAVIGATION
Home
Access Level Required: VIEW
Returns user to Home Screen.
PID Tuning
Access Level Required: VIEW
Moves to the PID Tuning Screen.
Auto/Manual
Access Level Required: VIEW
Moves to the Auto/Manual Screen.
Setpoints
Access Level Required: VIEW
Moves to the subscreen for the display of the Setpoints
Screens.
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