Johnson Controls YORK OPTIVIEW CONTROL CENTER, Operation Manual

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JOHNSON CONTROLS
25
SECTION 2 - OPTIVIEW OPERATION
FORM 160.10-O1
ISSUE DATE: 4/27/2018
2
three degrees per minute until the LCLTS setpoint of
45.0°F is reached. This reduces the load placed on the
chiller, saving energy and reducing chiller component
wear.
Sensitivity
Access Level Required: SERVICE
This value allows the user to adjust the sensitivity of
the Leaving Chilled Liquid Temperature control.
Pulse Time
Access Level Required: SERVICE
This allows the user to select the duration of each open
or close pulse of the Vane Actuator.
Pulse Period
Access Level Required: SERVICE
This allows the user to select the delay between pulses
either open or close of the Vane Actuator.
OVERVIEW
This is a sub-screen of the evaporator screen. The load
rate setpoint is accessible in this screen. This applica-
tion does not utilize agitator valves.
DISPLAY ONLY
None
PROGRAMMABLE
Load Rate
Access Level Required: SERVICE
This value, displayed within the load rate screen tab, is
expressed as °F/min. The load rate feature allows for a
controlled loading of the chiller by ramping down the
Leaving Chilled Liquid Temperature Setpoint (LCLTS)
the programmed number of degrees per minute after
initial startup.
As an example, if the LCLTS is 45.0°F, the actual
Leaving Chilled Liquid Temperature is 58.0°F, and the
Load Rate is 3.00 °F/min, the control panel will set the
LCLTS to 55.0°F at chiller start and reduce the setpoint
EVAPORATOR OPTIONS SCREEN
LD23595
FIGURE 6 - EVAPORATOR OPTIONS SCREEN