Table 12: Display only fields
Field/LED name Description
Leaving Chilled Liquid Temperature
Setpoints – Setpoint
Displays the present setpoint to which the chiller is operating, whether controlled
locally or remotely.
Leaving Chilled Liquid Temperature
Setpoints – Shutdown
Displays the Leaving Chilled Liquid Temperature at which the chiller shuts down 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 being used can
change automatically to prevent the Leaving Chilled Liquid Temperature from going
below the minimum allowed value: 34°F (water) or 6°F (brine). The offset being used is
displayed as Effective Offset. See the setpoint description below.
Leaving Chilled Liquid Temperature
Setpoints – Restart
Displays the Leaving Chilled Liquid Temperature at which the chiller will restart after
it has shut down on LEAVING CHILLED LIQUID – LOW TEMPERATURE cycling
shutdown. This temperature is set as an offset using the Leaving Chilled Liquid
Temperature Cycling Offset – Restart Setpoint, displayed as OFFSET adjacent to this
value.
Note: For fields requiring access level of SERVICE, Service Technicians must refer to the
OptiView Control Center - Service Instructions (Form 160.76-M1) for operation instructions and
explanation of all programmable setpoints and displayed values.
Table 13: Programmable
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
Local Leaving
Chilled Liquid
Temperature –
Setpoint
Operator Standard
This value allows the user to define the Leaving Chilled Liquid
Temperature that is to be maintained by the chiller. It is programmable
over the range of 36.0°F to 86.0°F (water) or 10.0°F to 86.0°F (brine). The
maximum allowed setpoint with Heat Pump duty enabled is 86.0°F. A
remote device can provide an analog signal 4 mA to 20 mA, 0 VDC to 10
VDC, or a 1 to 11 second PWM signal that changes the setpoint scaled by
the user defined Minimum and Maximum values. Additionally, an SC-EQ
communication interface in BAS Remote mode can define the setpoint
through a serial data stream.
Leaving
Chilled Liquid
Temperature
Cycling Offset –
Shutdown
Operator Standard
This value allows the user to specify the Leaving Chilled Liquid
Temperature at which the chiller will shut down on a LEAVING CHILLED
LIQUID – LOW TEMPERATURE cycling shutdown. This is done by defining
an offset below the Leaving Chilled Liquid Temperature Setpoint. It
is programmable over a range of 1°F to 70°F below the setpoint, to a
minimum cutout of 34°F (water), or 6°F (brine). Anytime the Leaving
Chilled Liquid Temperature Setpoint is increased, the shutdown threshold
is ramped up from the present setpoint to the new setpoint at the rate of
0.1°F/s (adjustable) to prevent a nuisance shutdown.
Leaving
Chilled Liquid
Temperature
Cycling Offset –
Restart
Operator Standard
This value allows the user to specify the Leaving Chilled Liquid
Temperature at which the chiller will restart after a shutdown on a
LEAVING CHILLED LIQUID – LOW TEMPERATURE cycling shutdown.
This is done by defining an offset above the Leaving Chilled Liquid
Temperature Setpoint. It is programmable over a range of 0°F to 60°F
above the setpoint, to a maximum restart value of 96°F. The chiller will
automatically restart when this temperature is reached. This setpoint can
be used to reduce chiller cycling by delaying the chiller restart until the
cooling load has increased.
Low Evaporator
Cutout
Service JCI Service
This value is only available in Brine mode. It allows the user to specify the
Evaporator Pressure at which a safety shutdown is initiated.
Refrigerant
(Enabled/
Disabled)
Service JCI Service
When an Evaporator Refrigerant Sensor has been installed, it must be
enabled via this toggle before the system can use the new, enhanced
resolution input.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center34
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