FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
27
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW™ CONTROL CENTER
2
EVAPORATOR SCREEN
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
Chilled Liquid Flow Switch (Open / Closed)
Displays whether the liquid flow is present in the evap-
orator.
Chilled Liquid Pump
Displays the command presently sent by the control
center to the Chilled Liquid Pump (
RUN
or
STOP
).
Evaporator Pressure
Displays the present refrigerant pressure in the evaporator.
Evaporator Saturation Temperature
Displays the present saturation temperature in the
evaporator.
Return Chilled Liquid Temperature
Displays the temperature of the liquid as it enters the
evaporator.
Leaving Chilled Liquid Temperature
Displays the temperature of the liquid as it leaves the
evaporator.
Small Temperature Difference
Displays the difference between the Leaving Chilled
Liquid Temperature and the Evaporator Refrigerant
temperature. In software versions C.MLM.05.04.xxx
(and later), the evaporator refrigerant temperature is
represented by the Evaporator Saturation Temperature.
In previous software versions, it is represented by the
Refrigerant Temperature sensor input if the sensor is
present and enabled; otherwise it will be represented
by the Evaporator Saturation temperature.
Leaving Chilled Liquid Temperature Setpoints
– Setpoint
Displays the present setpoint to which the chiller is
operating, whether controlled locally or remotely. This
value could come from a 0 to 20mA or 4-20 mA, 0 to
10VDC or 2 to 10VDC input in Analog Remote mode,
PWM signal in Digital Remote mode, MicroGateway
interface in ISN mode, or a locally programmed value
in Local mode. This setpoint is in effect for either WA-
TER, BRINE or BRINE/ICE storage operation. In Wa-
ter Cooling or Brine Cooling mode the slide valve is
modulated to achieve this setpoint. In Brine/Ice Storage
mode, unload pulses are inhibited, allowing the chiller
FIGURE 6 - EVAPORATOR SCREEN
LD09715
