JOHNSON CONTROLS
23
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
FORM 160.78-O2
ISSUE DATE: 5/22/2017
2
OVERVIEW
This screen displays a cutaway view of the chiller
evaporator. All setpoints relating to the evaporator side
of the chiller are maintained on this screen. Animation
of the evaporation process indicates whether the chiller
is presently in a
RUN
condition. Animation of the liq-
uid flow indicates chilled liquid flow.
DISPLAY ONLY
Leaving Chilled Liquid Temperature
Displays the temperature of the liquid as it leaves the
evaporator.
Entering Chilled Liquid Temperature
Displays the temperature of the liquid as it enters the
evaporator.
Evaporator Small Temperature Difference
Displays the difference between the Leaving Chilled
Liquid temperature and the Evaporator Refrigerant tem-
perature. The Evaporator Refrigerant temperature will
be represented by the Refrigerant Temperature sensor
input if the sensor is enabled, otherwise it will be repre-
sented by the Evaporator Saturation temperature.
Evaporator Pressure
Displays the present refrigerant pressure in the evapo-
rator.
Leaving Chilled Liquid Temperature Setpoints
– Setpoint
Displays the present setpoint to which the chiller is op-
erating, whether controlled locally or remotely.
Leaving Chilled Liquid Temperature Setpoints
- Shutdown
Displays the Leaving Chilled Liquid Temperature
at which the chiller will shutdown on LEAVING
CHILLED LIQUID – LOW TEMPERATURE. This
temperature is entered as an offset with the LEAVING
CHILLED LIQUID TEMPERATURE CYCLING
OFFSET – SHUTDOWN setpoint below. Although
the offset setpoint is changed manually, the offset be-
ing used can change automatically to prevent the leav-
ing chilled liquid temperature from going below the
minimum allowed value: 36ºF (water), 34ºF (water
with smart freeze enabled) or 6ºF (brine). The offset
being used is displayed as “Effective Offset”. Refer to
setpoint description below.
EVAPORATOR SCREEN
LD14846a
FIGURE 7 -
EVAPORATOR SCREEN
