York YD Mod D, Operation Manual, Page: 34 / 160

Evaporator screen
Figure 7: Evaporator screen
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 liquid flow indicates
chilled liquid flow.
Table 7: Display only fields
Field/LED name Description
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 temp difference
Displays the difference between the Leaving Chilled Liquid temperature and the
Evaporator Refrigerant temperature. The Evaporator Refrigerant temperature is
measured by the Refrigerant Temperature sensor input if the sensor is present,
otherwise it is calculated from the Evaporator Saturation temperature.
Evaporator pressure Displays the present refrigerant pressure in the evaporator.
Evaporator saturation temperature Displays the present saturation temperature in the evaporator.
Evaporator refrigerant temperature Displays the temperature of the refrigerant in the evaporator, if the sensor is present.
Chilled liquid flow switch (open /
closed)
Displays whether the liquid flow is present in the evaporator.
Chilled liquid pump
Displays the command presently sent by the control center to the Chilled Liquid Pump
(RUN or STOP).
Leaving chilled liquid temperature setpoints:
Setpoint
Displays the present setpoint to which the chiller is operating, whether controlled
locally or remotely.
Shutdown
Displays the Leaving Chilled Liquid Temperature at which the chiller will shut down to
avoid overcooling the building. By default this value is 4°F below the Leaving Chilled
Liquid Setpoint, but is adjustable.
Restart
Displays the Leaving Chilled Liquid Temperature at which the chiller will restart after
it has shutdown due to over-cooling temperature. By default, the chiller will restart at
the Leaving Chilled Liquid Temperature Setpoint, but is adjustable.
Model YD Mod D with OptiView Control Center 34